From patchwork Mon Jan 18 03:26:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026307 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDA9DC433DB for ; Mon, 18 Jan 2021 03:27:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CD9B224B0 for ; Mon, 18 Jan 2021 03:27:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731574AbhARD1t (ORCPT ); Sun, 17 Jan 2021 22:27:49 -0500 Received: from mga14.intel.com ([192.55.52.115]:9511 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728602AbhARD1r (ORCPT ); Sun, 17 Jan 2021 22:27:47 -0500 IronPort-SDR: OJuk4Nwu1M0ONch/pRl+yUJSAxTVlgr/ujhBCw7cvFVsGjD3R4Sln9tpRy+1LLv1w9OBWuR7RP 9XjLptxuzk2g== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="177975324" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="177975324" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:04 -0800 IronPort-SDR: CTq0FajyKyTvJ09uqyQEFk5C/TJOb38s49qlC/sX6tOmybNm78qzyfzaEiSJwWrEi47u2XA336 ClHSGHMO+0eQ== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150713" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:01 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 01/26] x86/cpufeatures: Add SGX1 and SGX2 sub-features Date: Mon, 18 Jan 2021 16:26:49 +1300 Message-Id: <87385f646120a3b5b34dc20480dbce77b8005acd.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add SGX1 and SGX2 feature flags, via CPUID.0x12.0x0.EAX, as scattered features. As part of virtualizing SGX, KVM will expose the SGX CPUID leafs to its guest, and to do so correctly needs to query hardware and kernel support for SGX1 and SGX2. Also add SGX related feature bits to CPUID dependency table to make clearing SGX feature easier. Signed-off-by: Sean Christopherson Co-developed-by: Kai Huang Signed-off-by: Kai Huang --- arch/x86/include/asm/cpufeatures.h | 2 ++ arch/x86/kernel/cpu/cpuid-deps.c | 3 +++ arch/x86/kernel/cpu/feat_ctl.c | 1 - arch/x86/kernel/cpu/scattered.c | 2 ++ 4 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 84b887825f12..18b2d0c8bbbe 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -292,6 +292,8 @@ #define X86_FEATURE_FENCE_SWAPGS_KERNEL (11*32+ 5) /* "" LFENCE in kernel entry SWAPGS path */ #define X86_FEATURE_SPLIT_LOCK_DETECT (11*32+ 6) /* #AC for split lock */ #define X86_FEATURE_PER_THREAD_MBA (11*32+ 7) /* "" Per-thread Memory Bandwidth Allocation */ +#define X86_FEATURE_SGX1 (11*32+ 8) /* Software Guard Extensions sub-feature SGX1 */ +#define X86_FEATURE_SGX2 (11*32+ 9) /* Software Guard Extensions sub-feature SGX2 */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index 42af31b64c2c..7d341bfe7f57 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -72,6 +72,9 @@ static const struct cpuid_dep cpuid_deps[] = { { X86_FEATURE_AVX512_FP16, X86_FEATURE_AVX512BW }, { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES }, { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA }, + { X86_FEATURE_SGX_LC, X86_FEATURE_SGX }, + { X86_FEATURE_SGX1, X86_FEATURE_SGX }, + { X86_FEATURE_SGX2, X86_FEATURE_SGX1 }, {} }; diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c index 3b1b01f2b248..7937a315f8cf 100644 --- a/arch/x86/kernel/cpu/feat_ctl.c +++ b/arch/x86/kernel/cpu/feat_ctl.c @@ -96,7 +96,6 @@ static void init_vmx_capabilities(struct cpuinfo_x86 *c) static void clear_sgx_caps(void) { setup_clear_cpu_cap(X86_FEATURE_SGX); - setup_clear_cpu_cap(X86_FEATURE_SGX_LC); } static int __init nosgx(char *str) diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c index 236924930bf0..fea0df867d18 100644 --- a/arch/x86/kernel/cpu/scattered.c +++ b/arch/x86/kernel/cpu/scattered.c @@ -36,6 +36,8 @@ static const struct cpuid_bit cpuid_bits[] = { { X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 }, { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 }, { X86_FEATURE_PER_THREAD_MBA, CPUID_ECX, 0, 0x00000010, 3 }, + { X86_FEATURE_SGX1, CPUID_EAX, 0, 0x00000012, 0 }, + { X86_FEATURE_SGX2, CPUID_EAX, 1, 0x00000012, 0 }, { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 }, { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, From patchwork Mon Jan 18 03:26:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34A2CC433E9 for ; Mon, 18 Jan 2021 03:27:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED2F2224B1 for ; Mon, 18 Jan 2021 03:27:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731589AbhARD1t (ORCPT ); Sun, 17 Jan 2021 22:27:49 -0500 Received: from mga14.intel.com ([192.55.52.115]:9514 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728690AbhARD1s (ORCPT ); Sun, 17 Jan 2021 22:27:48 -0500 IronPort-SDR: gmKPwpTvLk5E1AzRr9ule/AVmBBsZuyQ8ULpCEtDt0UTV4C6eoVIV52PTLUzaWX5C0wMn+gUN6 ks2vGXOITX6g== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="177975327" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="177975327" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:08 -0800 IronPort-SDR: cnVI9Jgv3qN2ACPBX0GvCeaQsRsu8epxUV3MJ+OrqboEOjtn9YNvEvGDg2gWnUw4H8v5dLREMl awAzCwCn+9Xw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150717" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:04 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 02/26] x86/sgx: Remove a warn from sgx_free_epc_page() Date: Mon, 18 Jan 2021 16:26:50 +1300 Message-Id: <85da2c1ce068b77ee9f31f6de9f3a34c36c410eb.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: "jarkko@kernel.org" Remove SGX_EPC_PAGE_RECLAIMER_TRACKED check and warning. This cannot happen, as enclave pages are freed only at the time when encl->refcount triggers, i.e. when both VFS and the page reclaimer have given up on their references. Signed-off-by: jarkko@kernel.org Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/main.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index c519fc5f6948..ebbd3b97b3d0 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -605,8 +605,6 @@ void sgx_free_epc_page(struct sgx_epc_page *page) struct sgx_epc_section *section = &sgx_epc_sections[page->section]; int ret; - WARN_ON_ONCE(page->flags & SGX_EPC_PAGE_RECLAIMER_TRACKED); - ret = __eremove(sgx_get_epc_virt_addr(page)); if (WARN_ONCE(ret, "EREMOVE returned %d (0x%x)", ret, ret)) return; From patchwork Mon Jan 18 03:26:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AC8EC433DB for ; Mon, 18 Jan 2021 03:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C80EF224B1 for ; Mon, 18 Jan 2021 03:27:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731602AbhARD1z (ORCPT ); Sun, 17 Jan 2021 22:27:55 -0500 Received: from mga14.intel.com ([192.55.52.115]:9518 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731605AbhARD1w (ORCPT ); Sun, 17 Jan 2021 22:27:52 -0500 IronPort-SDR: +FFpCH8/efuZ7DrQMGoSF3phY5ltfkhjBeYnKUOXj21EpFxkO5D2sv7i2cGtdvA5QINu2oLQse t8yHhNL/UxDg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="177975332" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="177975332" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:11 -0800 IronPort-SDR: /T56pYZridrCv56FyeT7eBy03Y2gcie6AyiB3zYiL51Z5Esn0zFtTmDQthky2wwJX781MwjVmD vjtDeU3U+j+Q== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150730" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:08 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 03/26] x86/sgx: Wipe out EREMOVE from sgx_free_epc_page() Date: Mon, 18 Jan 2021 16:26:51 +1300 Message-Id: <2df39cbffca7df168665584f0dcf2120b8804979.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: "jarkko@kernel.org" Encapsulate the snippet in sgx_free_epc_page() concerning EREMOVE to sgx_reset_epc_page(), which is a static helper function for sgx_encl_release(). It's the only function existing, which deals with initialized pages. Signed-off-by: jarkko@kernel.org Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/encl.c | 13 +++++++++++++ arch/x86/kernel/cpu/sgx/main.c | 10 ++++------ 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index ee50a5010277..a78b71447771 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -389,6 +389,16 @@ const struct vm_operations_struct sgx_vm_ops = { .access = sgx_vma_access, }; + +static void sgx_reset_epc_page(struct sgx_epc_page *epc_page) +{ + int ret; + + ret = __eremove(sgx_get_epc_virt_addr(epc_page)); + if (WARN_ONCE(ret, "EREMOVE returned %d (0x%x)", ret, ret)) + return; +} + /** * sgx_encl_release - Destroy an enclave instance * @kref: address of a kref inside &sgx_encl @@ -412,6 +422,7 @@ void sgx_encl_release(struct kref *ref) if (sgx_unmark_page_reclaimable(entry->epc_page)) continue; + sgx_reset_epc_page(entry->epc_page); sgx_free_epc_page(entry->epc_page); encl->secs_child_cnt--; entry->epc_page = NULL; @@ -423,6 +434,7 @@ void sgx_encl_release(struct kref *ref) xa_destroy(&encl->page_array); if (!encl->secs_child_cnt && encl->secs.epc_page) { + sgx_reset_epc_page(encl->secs.epc_page); sgx_free_epc_page(encl->secs.epc_page); encl->secs.epc_page = NULL; } @@ -431,6 +443,7 @@ void sgx_encl_release(struct kref *ref) va_page = list_first_entry(&encl->va_pages, struct sgx_va_page, list); list_del(&va_page->list); + sgx_reset_epc_page(va_page->epc_page); sgx_free_epc_page(va_page->epc_page); kfree(va_page); } diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index ebbd3b97b3d0..5e20b42f2639 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -598,16 +598,14 @@ struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim) * sgx_free_epc_page() - Free an EPC page * @page: an EPC page * - * Call EREMOVE for an EPC page and insert it back to the list of free pages. + * Put the EPC page back to the list of free pages. It's the callers + * responsibility to make sure that the page is in uninitialized state In other + * words, do EREMOVE, EWB or whatever operation is necessary before calling + * this function. */ void sgx_free_epc_page(struct sgx_epc_page *page) { struct sgx_epc_section *section = &sgx_epc_sections[page->section]; - int ret; - - ret = __eremove(sgx_get_epc_virt_addr(page)); - if (WARN_ONCE(ret, "EREMOVE returned %d (0x%x)", ret, ret)) - return; spin_lock(§ion->lock); list_add_tail(&page->list, §ion->page_list); From patchwork Mon Jan 18 03:26:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026313 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77EBCC433E0 for ; Mon, 18 Jan 2021 03:28:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41B0C224B1 for ; Mon, 18 Jan 2021 03:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729456AbhARD2N (ORCPT ); Sun, 17 Jan 2021 22:28:13 -0500 Received: from mga14.intel.com ([192.55.52.115]:9511 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731599AbhARD2E (ORCPT ); Sun, 17 Jan 2021 22:28:04 -0500 IronPort-SDR: Hw54pXySJkBHp0ta6ZO3AC4Oy95DgUzpXW8leZ+ylv9jCRvJwmMRQBrzNflsYchcDpkIuQfhnt 5BlKxhy0B9Kg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="177975336" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="177975336" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:15 -0800 IronPort-SDR: FUpiJ7pIQRFLgovY9Q/mB3ZzGPvR1PXhPIUTB7h6ntRvZWYNmahB2L8zK/QTkArAE5LwaaHBwO 8sA6I4bCbE5A== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150738" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:12 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 04/26] x86/sgx: Add SGX_CHILD_PRESENT hardware error code Date: Mon, 18 Jan 2021 16:26:52 +1300 Message-Id: <9638853bc880d5699e01bdf14b37814e2b08065f.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson SGX virtualization requires to allocate "raw" EPC and use it as "virtual EPC" for SGX guest. Unlike EPC used by SGX driver, virtual EPC doesn't track how EPC pages are used in VM, e.g. (de)construction of enclaves, so it cannot guarantee EREMOVE success, e.g. it doesn't have a priori knowledge of which pages are SECS with non-zero child counts. Add SGX_CHILD_PRESENT for use by SGX virtualization to assert EREMOVE failures are expected, but only due to SGX_CHILD_PRESENT. Signed-off-by: Sean Christopherson Acked-by: Jarkko Sakkinen Signed-off-by: Kai Huang --- v1->v2: - Change title to reflect hardware error code. --- arch/x86/kernel/cpu/sgx/arch.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/sgx/arch.h b/arch/x86/kernel/cpu/sgx/arch.h index dd7602c44c72..56b0f8ae3f92 100644 --- a/arch/x86/kernel/cpu/sgx/arch.h +++ b/arch/x86/kernel/cpu/sgx/arch.h @@ -26,12 +26,14 @@ * enum sgx_return_code - The return code type for ENCLS, ENCLU and ENCLV * %SGX_NOT_TRACKED: Previous ETRACK's shootdown sequence has not * been completed yet. + * %SGX_CHILD_PRESENT Enclave has child pages present in the EPC. * %SGX_INVALID_EINITTOKEN: EINITTOKEN is invalid and enclave signer's * public key does not match IA32_SGXLEPUBKEYHASH. * %SGX_UNMASKED_EVENT: An unmasked event, e.g. INTR, was received */ enum sgx_return_code { SGX_NOT_TRACKED = 11, + SGX_CHILD_PRESENT = 13, SGX_INVALID_EINITTOKEN = 16, SGX_UNMASKED_EVENT = 128, }; From patchwork Mon Jan 18 03:26:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026315 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D3B2C433DB for ; Mon, 18 Jan 2021 03:28:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E69F2224BD for ; Mon, 18 Jan 2021 03:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731620AbhARD2P (ORCPT ); Sun, 17 Jan 2021 22:28:15 -0500 Received: from mga14.intel.com ([192.55.52.115]:9514 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731605AbhARD2E (ORCPT ); Sun, 17 Jan 2021 22:28:04 -0500 IronPort-SDR: CzKLVfmZ2xUGbPb7WuaMHOOmiUmXqEHpyOixKU6tSmWe6zRLhoxp4ulow4XWdNLEAylucP1t/8 zrDRTRS0cmKQ== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="177975338" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="177975338" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:19 -0800 IronPort-SDR: U76wVg0niVgY7p83fW92SavU79ReJSD4naWRSJeC5VtSdCyYrQyDAUN0v0rBG9849P3Dxkf6YJ dQSyTY3XDVBw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150749" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:15 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 05/26] x86/sgx: Introduce virtual EPC for use by KVM guests Date: Mon, 18 Jan 2021 16:26:53 +1300 Message-Id: <4597db567351468c360fc810fff5a8232cb96c4c.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add a misc device /dev/sgx_virt_epc to allow userspace to allocate "raw" EPC without an associated enclave. The intended and only known use case for raw EPC allocation is to expose EPC to a KVM guest, hence the virt_epc moniker, virt.{c,h} files and X86_SGX_VIRTUALIZATION Kconfig. More specifically, to allocate a virtual EPC instance with particular size, the userspace hypervisor opens the device node, and uses mmap() with the intended size to get an address range of virtual EPC. Then it may use the address range to create one KVM memory slot as virtual EPC for guest. Implement the "raw" EPC allocation in the x86 core-SGX subsystem via /dev/sgx_virt_epc rather than in KVM. Doing so has two major advantages: - Does not require changes to KVM's uAPI, e.g. EPC gets handled as just another memory backend for guests. - EPC management is wholly contained in the SGX subsystem, e.g. SGX does not have to export any symbols, changes to reclaim flows don't need to be routed through KVM, SGX's dirty laundry doesn't have to get aired out for the world to see, and so on and so forth. The virtual EPC pages allocated to guests are currently not reclaimable. Reclaiming EPC page used by enclave requires a special reclaim mechanism separate from normal page reclaim, and that mechanism is not supported for virutal EPC pages. Due to the complications of handling reclaim conflicts between guest and host, reclaiming virtual EPC pages is significantly more complex than basic support for SGX virtualization. Signed-off-by: Sean Christopherson Co-developed-by: Kai Huang Signed-off-by: Kai Huang --- v1->v2: - Added one paragraph to explain fops of virtual EPC, per Jarkko's suggestion. - Moved change to sgx_init() out of this patch to a separate patch, as stated in cover letter. - In sgx_virt_epc_init(), return error if VMX is not supported, or CONFIG_KVM_INTEL is not enabled, because there's no point to create /dev/sgx_virt_epc if KVM is not supported. - Removed 'struct mm_struct *mm' in 'struct sgx_virt_epc', and related logic in sgx_virt_epc_open/release/mmap(), per Dave's comment. - Renamed 'virtual_epc_zombie_pages' and 'virt_epc_lock' to 'zombie_secs_pages' 'zombie_secs_pages_lock', per Dave's suggestion. - Changed __sgx_free_epc_page() to sgx_free_epc_page() due to Jarkko's patch removes EREMOVE in sgx_free_epc_page(). - Changed all struct sgx_virt_epc *epc to struct sgx_virt_epc *vepc. - In __sgx_virt_epc_fault(), changed comment to use WARN_ON() to make sure vepc->lock has already been hold, per Dave's suggestion. - In sgx_virt_epc_free_page(), added comments to explain SGX_ENCLAVE_ACT is not expected; and changed to use WARN_ONCE() to dump actual error code, per Dave's comment. - Removed NULL page check in sgx_virt_epc_free_page(), per Dave's comment. --- arch/x86/Kconfig | 12 ++ arch/x86/kernel/cpu/sgx/Makefile | 1 + arch/x86/kernel/cpu/sgx/virt.c | 255 +++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/sgx/virt.h | 14 ++ 4 files changed, 282 insertions(+) create mode 100644 arch/x86/kernel/cpu/sgx/virt.c create mode 100644 arch/x86/kernel/cpu/sgx/virt.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 21f851179ff0..d089ddf01846 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1951,6 +1951,18 @@ config X86_SGX If unsure, say N. +config X86_SGX_VIRTUALIZATION + bool "Software Guard eXtensions (SGX) Virtualization" + depends on X86_SGX && KVM_INTEL + help + + Enables KVM guests to create SGX enclaves. + + This includes support to expose "raw" unreclaimable enclave memory to + guests via a device node, e.g. /dev/sgx_virt_epc. + + If unsure, say N. + config EFI bool "EFI runtime service support" depends on ACPI diff --git a/arch/x86/kernel/cpu/sgx/Makefile b/arch/x86/kernel/cpu/sgx/Makefile index 91d3dc784a29..7a25bf63adfb 100644 --- a/arch/x86/kernel/cpu/sgx/Makefile +++ b/arch/x86/kernel/cpu/sgx/Makefile @@ -3,3 +3,4 @@ obj-y += \ encl.o \ ioctl.o \ main.o +obj-$(CONFIG_X86_SGX_VIRTUALIZATION) += virt.o diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c new file mode 100644 index 000000000000..1e8620f20651 --- /dev/null +++ b/arch/x86/kernel/cpu/sgx/virt.c @@ -0,0 +1,255 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2016-20 Intel Corporation. */ + +#define pr_fmt(fmt) "SGX virtual EPC: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "encls.h" +#include "sgx.h" +#include "virt.h" + +struct sgx_virt_epc { + struct xarray page_array; + struct mutex lock; +}; + +static struct mutex zombie_secs_pages_lock; +static struct list_head zombie_secs_pages; + +static int __sgx_virt_epc_fault(struct sgx_virt_epc *vepc, + struct vm_area_struct *vma, unsigned long addr) +{ + struct sgx_epc_page *epc_page; + unsigned long index, pfn; + int ret; + + WARN_ON(!mutex_is_locked(&vepc->lock)); + + /* Calculate index of EPC page in virtual EPC's page_array */ + index = vma->vm_pgoff + PFN_DOWN(addr - vma->vm_start); + + epc_page = xa_load(&vepc->page_array, index); + if (epc_page) + return 0; + + epc_page = sgx_alloc_epc_page(vepc, false); + if (IS_ERR(epc_page)) + return PTR_ERR(epc_page); + + ret = xa_err(xa_store(&vepc->page_array, index, epc_page, GFP_KERNEL)); + if (ret) + goto err_free; + + pfn = PFN_DOWN(sgx_get_epc_phys_addr(epc_page)); + + ret = vmf_insert_pfn(vma, addr, pfn); + if (ret != VM_FAULT_NOPAGE) { + ret = -EFAULT; + goto err_delete; + } + + return 0; + +err_delete: + xa_erase(&vepc->page_array, index); +err_free: + sgx_free_epc_page(epc_page); + return ret; +} + +static vm_fault_t sgx_virt_epc_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct sgx_virt_epc *vepc = vma->vm_private_data; + int ret; + + mutex_lock(&vepc->lock); + ret = __sgx_virt_epc_fault(vepc, vma, vmf->address); + mutex_unlock(&vepc->lock); + + if (!ret) + return VM_FAULT_NOPAGE; + + if (ret == -EBUSY && (vmf->flags & FAULT_FLAG_ALLOW_RETRY)) { + mmap_read_unlock(vma->vm_mm); + return VM_FAULT_RETRY; + } + + return VM_FAULT_SIGBUS; +} + +const struct vm_operations_struct sgx_virt_epc_vm_ops = { + .fault = sgx_virt_epc_fault, +}; + +static int sgx_virt_epc_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct sgx_virt_epc *vepc = file->private_data; + + if (!(vma->vm_flags & VM_SHARED)) + return -EINVAL; + + vma->vm_ops = &sgx_virt_epc_vm_ops; + /* Don't copy VMA in fork() */ + vma->vm_flags |= VM_PFNMAP | VM_IO | VM_DONTDUMP | VM_DONTCOPY; + vma->vm_private_data = vepc; + + return 0; +} + +static int sgx_virt_epc_free_page(struct sgx_epc_page *epc_page) +{ + int ret; + + /* + * Take a previously guest-owned EPC page and return it to the + * general EPC page pool. + * + * Guests can not be trusted to have left this page in a good + * state, so run EREMOVE on the page unconditionally. In the + * case that a guest properly EREMOVE'd this page, a superfluous + * EREMOVE is harmless. + */ + ret = __eremove(sgx_get_epc_virt_addr(epc_page)); + if (ret) { + /* + * Only SGX_CHILD_PRESENT is expected, which is because of + * EREMOVE'ing an SECS still with child, in which case it can + * be handled by EREMOVE'ing the SECS again after all pages in + * virtual EPC have been EREMOVE'd. See comments in below in + * sgx_virt_epc_release(). + * + * The user of virtual EPC (KVM) needs to guarantee there's no + * logical processor is still running in the enclave in guest, + * otherwise EREMOVE will get SGX_ENCLAVE_ACT which cannot be + * handled here. + */ + WARN_ONCE(ret != SGX_CHILD_PRESENT, + "EREMOVE (EPC page 0x%lx): unexpected error: %d\n", + sgx_get_epc_phys_addr(epc_page), ret); + return ret; + } + + sgx_free_epc_page(epc_page); + return 0; +} + +static int sgx_virt_epc_release(struct inode *inode, struct file *file) +{ + struct sgx_virt_epc *vepc = file->private_data; + struct sgx_epc_page *epc_page, *tmp, *entry; + unsigned long index; + + LIST_HEAD(secs_pages); + + xa_for_each(&vepc->page_array, index, entry) { + /* + * Remove all normal, child pages. sgx_virt_epc_free_page() + * will fail if EREMOVE fails, but this is OK and expected on + * SECS pages. Those can only be EREMOVE'd *after* all their + * child pages. Retries below will clean them up. + */ + if (sgx_virt_epc_free_page(entry)) + continue; + + xa_erase(&vepc->page_array, index); + } + + /* + * Retry EREMOVE'ing pages. This will clean up any SECS pages that + * only had children in this 'epc' area. + */ + xa_for_each(&vepc->page_array, index, entry) { + epc_page = entry; + /* + * An EREMOVE failure here means that the SECS page + * still has children. But, since all children in this + * 'sgx_virt_epc' have been removed, the SECS page must + * have a child on another instance. + */ + if (sgx_virt_epc_free_page(epc_page)) + list_add_tail(&epc_page->list, &secs_pages); + + xa_erase(&vepc->page_array, index); + } + + /* + * SECS pages are "pinned" by child pages, an unpinned once all + * children have been EREMOVE'd. A child page in this instance + * may have pinned an SECS page encountered in an earlier + * release(), creating a zombie. Since some children were + * EREMOVE'd above, try to EREMOVE all zombies in the hopes that + * one was unpinned. + */ + mutex_lock(&zombie_secs_pages_lock); + list_for_each_entry_safe(epc_page, tmp, &zombie_secs_pages, list) { + /* + * Speculatively remove the page from the list of zombies, if + * the page is successfully EREMOVE it will be added to the + * list of free pages. If EREMOVE fails, throw the page on the + * local list, which will be spliced on at the end. + */ + list_del(&epc_page->list); + + if (sgx_virt_epc_free_page(epc_page)) + list_add_tail(&epc_page->list, &secs_pages); + } + + if (!list_empty(&secs_pages)) + list_splice_tail(&secs_pages, &zombie_secs_pages); + mutex_unlock(&zombie_secs_pages_lock); + + kfree(vepc); + + return 0; +} + +static int sgx_virt_epc_open(struct inode *inode, struct file *file) +{ + struct sgx_virt_epc *vepc; + + vepc = kzalloc(sizeof(struct sgx_virt_epc), GFP_KERNEL); + if (!vepc) + return -ENOMEM; + mutex_init(&vepc->lock); + xa_init(&vepc->page_array); + + file->private_data = vepc; + + return 0; +} + +static const struct file_operations sgx_virt_epc_fops = { + .owner = THIS_MODULE, + .open = sgx_virt_epc_open, + .release = sgx_virt_epc_release, + .mmap = sgx_virt_epc_mmap, +}; + +static struct miscdevice sgx_virt_epc_dev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "sgx_virt_epc", + .nodename = "sgx_virt_epc", + .fops = &sgx_virt_epc_fops, +}; + +int __init sgx_virt_epc_init(void) +{ + /* SGX virtualization requires KVM to work */ + if (!boot_cpu_has(X86_FEATURE_VMX) || !IS_ENABLED(CONFIG_KVM_INTEL)) + return -ENODEV; + + INIT_LIST_HEAD(&zombie_secs_pages); + mutex_init(&zombie_secs_pages_lock); + + return misc_register(&sgx_virt_epc_dev); +} diff --git a/arch/x86/kernel/cpu/sgx/virt.h b/arch/x86/kernel/cpu/sgx/virt.h new file mode 100644 index 000000000000..e5434541a122 --- /dev/null +++ b/arch/x86/kernel/cpu/sgx/virt.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */ +#ifndef _ASM_X86_SGX_VIRT_H +#define _ASM_X86_SGX_VIRT_H + +#ifdef CONFIG_X86_SGX_VIRTUALIZATION +int __init sgx_virt_epc_init(void); +#else +static inline int __init sgx_virt_epc_init(void) +{ + return -ENODEV; +} +#endif + +#endif /* _ASM_X86_SGX_VIRT_H */ From patchwork Mon Jan 18 03:27:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026317 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A76B2C433E6 for ; Mon, 18 Jan 2021 03:28:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83D0A224B1 for ; Mon, 18 Jan 2021 03:28:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731605AbhARD2T (ORCPT ); Sun, 17 Jan 2021 22:28:19 -0500 Received: from mga01.intel.com ([192.55.52.88]:54207 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731627AbhARD2S (ORCPT ); Sun, 17 Jan 2021 22:28:18 -0500 IronPort-SDR: WP1SjMNm1FNjbCyJFHt1dvj3qIhvLllYJ4KCMtCBb2IYC8UAe7FXMc+8BVdlMK8kpaLfEFELxd AZ+o8hr/UhAw== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="197445790" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="197445790" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:37 -0800 IronPort-SDR: a9/rIcRQ7C0SNk7bXxfVeAySeodj8BE4vZ3+Cqjb/pMK+vgTZJb5VNqJ6+ns3Y6grMSs7UdtCg AqxfCRNel5BQ== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150870" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:33 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jethro@fortanix.com, b.thiel@posteo.de, Kai Huang Subject: [RFC PATCH v2 06/26] x86/cpu/intel: Allow SGX virtualization without Launch Control support Date: Mon, 18 Jan 2021 16:27:19 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson The kernel will currently disable all SGX support if the hardware does not support launch control. Make it more permissive to allow SGX virtualization on systems without Launch Control support. This will allow KVM to expose SGX to guests that have less-strict requirements on the availability of flexible launch control. Improve error message to distinguish between three cases. There are two cases where SGX support is completely disabled: 1) SGX has been disabled completely by the BIOS 2) SGX LC is locked by the BIOS. Bare-metal support is disabled because of LC unavailability. SGX virtualization is unavailable (because of Kconfig). One where it is partially available: 3) SGX LC is locked by the BIOS. Bare-metal support is disabled because of LC unavailability. SGX virtualization is supported. Signed-off-by: Sean Christopherson Co-developed-by: Kai Huang Signed-off-by: Kai Huang --- v1->v2: - Refined commit message per Dave's comments. - Added check to only enable SGX virtualization when VMX is supported, per Dave's comment. - Refined error msg print to explicitly call out SGX virtualization will be supported when LC is locked by BIOS, per Dave's comment. --- arch/x86/kernel/cpu/feat_ctl.c | 64 +++++++++++++++++++++++++++------- 1 file changed, 51 insertions(+), 13 deletions(-) diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c index 7937a315f8cf..7bd8c57c62fa 100644 --- a/arch/x86/kernel/cpu/feat_ctl.c +++ b/arch/x86/kernel/cpu/feat_ctl.c @@ -98,6 +98,11 @@ static void clear_sgx_caps(void) setup_clear_cpu_cap(X86_FEATURE_SGX); } +static void clear_sgx_lc(void) +{ + setup_clear_cpu_cap(X86_FEATURE_SGX_LC); +} + static int __init nosgx(char *str) { clear_sgx_caps(); @@ -110,7 +115,7 @@ early_param("nosgx", nosgx); void init_ia32_feat_ctl(struct cpuinfo_x86 *c) { bool tboot = tboot_enabled(); - bool enable_sgx; + bool enable_vmx, enable_sgx_virt, enable_sgx_driver; u64 msr; if (rdmsrl_safe(MSR_IA32_FEAT_CTL, &msr)) { @@ -119,13 +124,24 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c) return; } + enable_vmx = cpu_has(c, X86_FEATURE_VMX) && + IS_ENABLED(CONFIG_KVM_INTEL); + /* - * Enable SGX if and only if the kernel supports SGX and Launch Control - * is supported, i.e. disable SGX if the LE hash MSRs can't be written. + * Enable SGX if and only if the kernel supports SGX. Require Launch + * Control support if SGX virtualization is *not* supported, i.e. + * disable SGX if the LE hash MSRs can't be written and SGX can't be + * exposed to a KVM guest (which might support non-LC configurations). */ - enable_sgx = cpu_has(c, X86_FEATURE_SGX) && - cpu_has(c, X86_FEATURE_SGX_LC) && - IS_ENABLED(CONFIG_X86_SGX); + enable_sgx_driver = cpu_has(c, X86_FEATURE_SGX) && + cpu_has(c, X86_FEATURE_SGX1) && + IS_ENABLED(CONFIG_X86_SGX) && + cpu_has(c, X86_FEATURE_SGX_LC); + enable_sgx_virt = cpu_has(c, X86_FEATURE_SGX) && + cpu_has(c, X86_FEATURE_SGX1) && + IS_ENABLED(CONFIG_X86_SGX) && + IS_ENABLED(CONFIG_X86_SGX_VIRTUALIZATION) && + enable_vmx; if (msr & FEAT_CTL_LOCKED) goto update_caps; @@ -141,15 +157,18 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c) * i.e. KVM is enabled, to avoid unnecessarily adding an attack vector * for the kernel, e.g. using VMX to hide malicious code. */ - if (cpu_has(c, X86_FEATURE_VMX) && IS_ENABLED(CONFIG_KVM_INTEL)) { + if (enable_vmx) { msr |= FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX; if (tboot) msr |= FEAT_CTL_VMX_ENABLED_INSIDE_SMX; } - if (enable_sgx) - msr |= FEAT_CTL_SGX_ENABLED | FEAT_CTL_SGX_LC_ENABLED; + if (enable_sgx_driver || enable_sgx_virt) { + msr |= FEAT_CTL_SGX_ENABLED; + if (enable_sgx_driver) + msr |= FEAT_CTL_SGX_LC_ENABLED; + } wrmsrl(MSR_IA32_FEAT_CTL, msr); @@ -172,10 +191,29 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c) } update_sgx: - if (!(msr & FEAT_CTL_SGX_ENABLED) || - !(msr & FEAT_CTL_SGX_LC_ENABLED) || !enable_sgx) { - if (enable_sgx) - pr_err_once("SGX disabled by BIOS\n"); + if (!(msr & FEAT_CTL_SGX_ENABLED)) { + if (enable_sgx_driver || enable_sgx_virt) + pr_err_once("SGX disabled by BIOS.\n"); clear_sgx_caps(); + return; + } + + /* + * VMX feature bit may be cleared due to being disabled in BIOS, + * in which case SGX virtualization cannot be supported either. + */ + if (!cpu_has(c, X86_FEATURE_VMX) && enable_sgx_virt) { + pr_err_once("SGX virtualization disabled due to lack of VMX.\n"); + enable_sgx_virt = 0; + } + + if (!(msr & FEAT_CTL_SGX_LC_ENABLED) && enable_sgx_driver) { + if (!enable_sgx_virt) { + pr_err_once("SGX Launch Control is locked. Disable SGX.\n"); + clear_sgx_caps(); + } else { + pr_err_once("SGX Launch Control is locked. Support SGX virtualization only.\n"); + clear_sgx_lc(); + } } } From patchwork Mon Jan 18 03:27:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026319 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98626C433E0 for ; Mon, 18 Jan 2021 03:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66DEC224B0 for ; Mon, 18 Jan 2021 03:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730132AbhARD2d (ORCPT ); Sun, 17 Jan 2021 22:28:33 -0500 Received: from mga02.intel.com ([134.134.136.20]:30517 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731643AbhARD2c (ORCPT ); Sun, 17 Jan 2021 22:28:32 -0500 IronPort-SDR: eTmZw6PkwbfBLnhkqUOmpV/wY9TC42OZAXhlDcNUq6QrVgJ/ody074/qdk2K7pxuPy2bKiVeI6 ZARc60HHFvHA== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="165843049" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="165843049" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:50 -0800 IronPort-SDR: FWVF7Od1x+XYTMVbnROpUWhBPiPGpotPeWgYvmbD/JLDmHozO6Q0WA/4xNb7cm/iUwyiGjkGfv tZMGuus+HCfw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150905" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:27:46 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 07/26] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Date: Mon, 18 Jan 2021 16:27:38 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Modify sgx_init() to always try to initialize the virtual EPC driver, even if the bare-metal SGX driver is disabled. The bare-metal driver might be disabled if SGX Launch Control is in locked mode, or not supported in the hardware at all. This allows (non-Linux) guests that support non-LC configurations to use SGX. Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 5e20b42f2639..bdda631c975b 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -12,6 +12,7 @@ #include "driver.h" #include "encl.h" #include "encls.h" +#include "virt.h" struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS]; static int sgx_nr_epc_sections; @@ -710,7 +711,8 @@ static void __init sgx_init(void) if (!sgx_page_reclaimer_init()) goto err_page_cache; - ret = sgx_drv_init(); + /* Success if the native *or* virtual EPC driver initialized cleanly. */ + ret = !!sgx_drv_init() & !!sgx_virt_epc_init(); if (ret) goto err_kthread; From patchwork Mon Jan 18 03:27:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026321 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60897C433DB for ; Mon, 18 Jan 2021 03:28:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 395AB224B1 for ; Mon, 18 Jan 2021 03:28:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731644AbhARD2p (ORCPT ); Sun, 17 Jan 2021 22:28:45 -0500 Received: from mga04.intel.com ([192.55.52.120]:7978 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731642AbhARD2o (ORCPT ); Sun, 17 Jan 2021 22:28:44 -0500 IronPort-SDR: z1ol3waqQBLcgU+jzfBky8DkdIsFuvKuCfog3y/4QZlmBZiJ/OrF7qNpai2hsLPsoGKIKv+pFR cmRf7V+MOOPg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="176181385" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="176181385" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:03 -0800 IronPort-SDR: 6wawdg5lsuHy1fFvOC7yIeMD2oNd1dRJRgDqqEaFRPJoNNvGYQb2DEiIoK/ALFSyEyjdedxlBI 0Vbwoas/IG9Q== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150940" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:00 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jethro@fortanix.com, Kai Huang Subject: [RFC PATCH v2 08/26] x86/sgx: Expose SGX architectural definitions to the kernel Date: Mon, 18 Jan 2021 16:27:49 +1300 Message-Id: <25746564cb0a719a69b6138d8004b987a5e0bc91.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson KVM will use many of the architectural constants and structs to virtualize SGX. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/{kernel/cpu/sgx/arch.h => include/asm/sgx_arch.h} | 0 arch/x86/kernel/cpu/sgx/encl.c | 2 +- arch/x86/kernel/cpu/sgx/sgx.h | 2 +- tools/testing/selftests/sgx/defines.h | 2 +- 4 files changed, 3 insertions(+), 3 deletions(-) rename arch/x86/{kernel/cpu/sgx/arch.h => include/asm/sgx_arch.h} (100%) diff --git a/arch/x86/kernel/cpu/sgx/arch.h b/arch/x86/include/asm/sgx_arch.h similarity index 100% rename from arch/x86/kernel/cpu/sgx/arch.h rename to arch/x86/include/asm/sgx_arch.h diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index a78b71447771..68941c349cfe 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -7,7 +7,7 @@ #include #include #include -#include "arch.h" +#include #include "encl.h" #include "encls.h" #include "sgx.h" diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 5fa42d143feb..509f2af33e1d 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -8,7 +8,7 @@ #include #include #include -#include "arch.h" +#include #undef pr_fmt #define pr_fmt(fmt) "sgx: " fmt diff --git a/tools/testing/selftests/sgx/defines.h b/tools/testing/selftests/sgx/defines.h index 592c1ccf4576..4dd39a003f40 100644 --- a/tools/testing/selftests/sgx/defines.h +++ b/tools/testing/selftests/sgx/defines.h @@ -14,7 +14,7 @@ #define __aligned(x) __attribute__((__aligned__(x))) #define __packed __attribute__((packed)) -#include "../../../../arch/x86/kernel/cpu/sgx/arch.h" +#include "../../../../arch/x86/include/asm/sgx_arch.h" #include "../../../../arch/x86/include/asm/enclu.h" #include "../../../../arch/x86/include/uapi/asm/sgx.h" From patchwork Mon Jan 18 03:27:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026323 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25F01C433E0 for ; Mon, 18 Jan 2021 03:28:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8AA4224B1 for ; Mon, 18 Jan 2021 03:28:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731642AbhARD2s (ORCPT ); Sun, 17 Jan 2021 22:28:48 -0500 Received: from mga04.intel.com ([192.55.52.120]:7981 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731646AbhARD2r (ORCPT ); Sun, 17 Jan 2021 22:28:47 -0500 IronPort-SDR: SF12W9Gf8CH+slz3lmh6hpDwUfGKZJpBVaAdzcBfgZvn/dNAUdiXajVIDcY62JoMg6x4IlZkFu YsrPPN9KWS8g== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="176181392" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="176181392" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:07 -0800 IronPort-SDR: uqOavVeQR26pbvbgyLnFeREj4UOaPqocmgCb+2uorgPZYA2+c3TeT0PDRBY5ah3cbwGdbD9r3F vKvqr+Reofcw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150947" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:03 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jethro@fortanix.com, Kai Huang Subject: [RFC PATCH v2 09/26] x86/sgx: Move ENCLS leaf definitions to sgx_arch.h Date: Mon, 18 Jan 2021 16:27:50 +1300 Message-Id: <5a23890a36c31896addfd41bae9211545024f8ba.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Move the ENCLS leaf definitions to sgx_arch.h so that they can be used by KVM. And because they're architectural. Signed-off-by: Sean Christopherson Acked-by: Dave Hansen Signed-off-by: Kai Huang Acked-by: Jarkko Sakkinen --- arch/x86/include/asm/sgx_arch.h | 15 +++++++++++++++ arch/x86/kernel/cpu/sgx/encls.h | 15 --------------- 2 files changed, 15 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/sgx_arch.h b/arch/x86/include/asm/sgx_arch.h index 56b0f8ae3f92..38ef7ce3d3c7 100644 --- a/arch/x86/include/asm/sgx_arch.h +++ b/arch/x86/include/asm/sgx_arch.h @@ -22,6 +22,21 @@ /* The bitmask for the EPC section type. */ #define SGX_CPUID_EPC_MASK GENMASK(3, 0) +enum sgx_encls_function { + ECREATE = 0x00, + EADD = 0x01, + EINIT = 0x02, + EREMOVE = 0x03, + EDGBRD = 0x04, + EDGBWR = 0x05, + EEXTEND = 0x06, + ELDU = 0x08, + EBLOCK = 0x09, + EPA = 0x0A, + EWB = 0x0B, + ETRACK = 0x0C, +}; + /** * enum sgx_return_code - The return code type for ENCLS, ENCLU and ENCLV * %SGX_NOT_TRACKED: Previous ETRACK's shootdown sequence has not diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h index 443188fe7e70..be5c49689980 100644 --- a/arch/x86/kernel/cpu/sgx/encls.h +++ b/arch/x86/kernel/cpu/sgx/encls.h @@ -11,21 +11,6 @@ #include #include "sgx.h" -enum sgx_encls_function { - ECREATE = 0x00, - EADD = 0x01, - EINIT = 0x02, - EREMOVE = 0x03, - EDGBRD = 0x04, - EDGBWR = 0x05, - EEXTEND = 0x06, - ELDU = 0x08, - EBLOCK = 0x09, - EPA = 0x0A, - EWB = 0x0B, - ETRACK = 0x0C, -}; - /** * ENCLS_FAULT_FLAG - flag signifying an ENCLS return code is a trapnr * From patchwork Mon Jan 18 03:28:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026325 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F9A4C433DB for ; Mon, 18 Jan 2021 03:29:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22ACB224B1 for ; Mon, 18 Jan 2021 03:29:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731648AbhARD3H (ORCPT ); Sun, 17 Jan 2021 22:29:07 -0500 Received: from mga18.intel.com ([134.134.136.126]:60995 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731591AbhARD3B (ORCPT ); Sun, 17 Jan 2021 22:29:01 -0500 IronPort-SDR: ZD4XzKsD9ppNUSdlRaIew1BsvGkbSBi+pdMb7/+F8S7zUwW+UaeLhpu7L9rbrZbvgSovBNgx+l 6lLSjlkgWfbg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="166420858" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="166420858" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:21 -0800 IronPort-SDR: yOnSBwfrcUoWratPzu49e1yjzORlzaEYO0/g3UESmNgrrimDLVy2RlTU52b5VZ96ndwr5FgjTN CTsyIuMKJJJA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573150982" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:17 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 10/26] x86/sgx: Add SGX2 ENCLS leaf definitions (EAUG, EMODPR and EMODT) Date: Mon, 18 Jan 2021 16:28:03 +1300 Message-Id: <23b8becce4117d4661121b4136d439e89e9b3b01.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Define the ENCLS leafs that are available with SGX2, also referred to as Enclave Dynamic Memory Management (EDMM). The leafs will be used by KVM to conditionally expose SGX2 capabilities to guests. Signed-off-by: Sean Christopherson Acked-by: Dave Hansen Signed-off-by: Kai Huang Acked-by: Jarkko Sakkinen --- arch/x86/include/asm/sgx_arch.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/include/asm/sgx_arch.h b/arch/x86/include/asm/sgx_arch.h index 38ef7ce3d3c7..2323ded379d6 100644 --- a/arch/x86/include/asm/sgx_arch.h +++ b/arch/x86/include/asm/sgx_arch.h @@ -35,6 +35,9 @@ enum sgx_encls_function { EPA = 0x0A, EWB = 0x0B, ETRACK = 0x0C, + EAUG = 0x0D, + EMODPR = 0x0E, + EMODT = 0x0F, }; /** From patchwork Mon Jan 18 03:28:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026327 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2630C433E6 for ; Mon, 18 Jan 2021 03:29:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B15CC224B1 for ; Mon, 18 Jan 2021 03:29:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731658AbhARD3H (ORCPT ); Sun, 17 Jan 2021 22:29:07 -0500 Received: from mga18.intel.com ([134.134.136.126]:61000 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731646AbhARD3F (ORCPT ); Sun, 17 Jan 2021 22:29:05 -0500 IronPort-SDR: 87xHGcDkx5aSdBFy5J1iA6lWs//DDgpXifXa8+svrG1eg2q4bY7mRp1NGk7Lq7jslHYrylXz4g N2j0vgCKyQGA== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="166420869" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="166420869" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:24 -0800 IronPort-SDR: EY+JLfLRaLHSpmC1Lc0FV7Y6tOKH6tkmHsTCwpPvmtxDNxut6PJQBjzOr0fq0XcdAZgLM2r1a3 JxRxe/U2qWTw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151001" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:21 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 11/26] x86/sgx: Add encls_faulted() helper Date: Mon, 18 Jan 2021 16:28:04 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add a helper to extract the fault indicator from an encoded ENCLS return value. SGX virtualization will also need to detect ENCLS faults. Signed-off-by: Sean Christopherson Acked-by: Dave Hansen Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/encls.h | 14 +++++++++++++- arch/x86/kernel/cpu/sgx/ioctl.c | 2 +- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h index be5c49689980..55919a2b01b0 100644 --- a/arch/x86/kernel/cpu/sgx/encls.h +++ b/arch/x86/kernel/cpu/sgx/encls.h @@ -40,6 +40,18 @@ } while (0); \ } +/* + * encls_faulted() - Check if an ENCLS leaf faulted given an error code + * @ret the return value of an ENCLS leaf function call + * + * Return: + * %true if @ret indicates a fault, %false otherwise + */ +static inline bool encls_faulted(int ret) +{ + return ret & ENCLS_FAULT_FLAG; +} + /** * encls_failed() - Check if an ENCLS function failed * @ret: the return value of an ENCLS function call @@ -50,7 +62,7 @@ */ static inline bool encls_failed(int ret) { - if (ret & ENCLS_FAULT_FLAG) + if (encls_faulted(ret)) return ENCLS_TRAPNR(ret) != X86_TRAP_PF; return !!ret; diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index 90a5caf76939..e5977752c7be 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -568,7 +568,7 @@ static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct, } } - if (ret & ENCLS_FAULT_FLAG) { + if (encls_faulted(ret)) { if (encls_failed(ret)) ENCLS_WARN(ret, "EINIT"); From patchwork Mon Jan 18 03:28:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026329 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19E2DC433E0 for ; Mon, 18 Jan 2021 03:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA88E224B8 for ; Mon, 18 Jan 2021 03:29:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731646AbhARD3L (ORCPT ); Sun, 17 Jan 2021 22:29:11 -0500 Received: from mga18.intel.com ([134.134.136.126]:61008 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731662AbhARD3J (ORCPT ); Sun, 17 Jan 2021 22:29:09 -0500 IronPort-SDR: tUKcIBY8frfR0eWIK6eRoGe8ZXlglB5tfewGKbuEoEORE/+ioUaWBbXGcPmRSx0edaujbI6jjQ yKhKMS0RTidQ== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="166420875" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="166420875" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:28 -0800 IronPort-SDR: 2B30kzKDjdHXm0fBVVHZyQE0OELjHftXFVnt9AePbSlXVYidPDlrcpvk3nh1DqjpNhTO8SwKxP +S9Yq6HvvH1w== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151020" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:24 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 12/26] x86/sgx: Add helper to update SGX_LEPUBKEYHASHn MSRs Date: Mon, 18 Jan 2021 16:28:05 +1300 Message-Id: <5116fdc732e8e14b3378c44e3b461a43f330ed0c.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Add a helper to update SGX_LEPUBKEYHASHn MSRs. SGX virtualization also needs to update those MSRs based on guest's "virtual" SGX_LEPUBKEYHASHn before EINIT from guest. Acked-by: Dave Hansen Signed-off-by: Kai Huang --- arch/x86/kernel/cpu/sgx/ioctl.c | 5 ++--- arch/x86/kernel/cpu/sgx/main.c | 8 ++++++++ arch/x86/kernel/cpu/sgx/sgx.h | 2 ++ 3 files changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index e5977752c7be..1bae754268d1 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -495,7 +495,7 @@ static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct, void *token) { u64 mrsigner[4]; - int i, j, k; + int i, j; void *addr; int ret; @@ -544,8 +544,7 @@ static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct, preempt_disable(); - for (k = 0; k < 4; k++) - wrmsrl(MSR_IA32_SGXLEPUBKEYHASH0 + k, mrsigner[k]); + sgx_update_lepubkeyhash(mrsigner); ret = __einit(sigstruct, token, addr); diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index bdda631c975b..1cf1f0f058b8 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -697,6 +697,14 @@ static bool __init sgx_page_cache_init(void) return true; } +void sgx_update_lepubkeyhash(u64 *lepubkeyhash) +{ + int i; + + for (i = 0; i < 4; i++) + wrmsrl(MSR_IA32_SGXLEPUBKEYHASH0 + i, lepubkeyhash[i]); +} + static void __init sgx_init(void) { int ret; diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 509f2af33e1d..ccd4f145c464 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -83,4 +83,6 @@ void sgx_mark_page_reclaimable(struct sgx_epc_page *page); int sgx_unmark_page_reclaimable(struct sgx_epc_page *page); struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim); +void sgx_update_lepubkeyhash(u64 *lepubkeyhash); + #endif /* _X86_SGX_H */ From patchwork Mon Jan 18 03:28:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026331 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23E71C433E0 for ; Mon, 18 Jan 2021 03:29:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE76B224B1 for ; Mon, 18 Jan 2021 03:29:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731676AbhARD30 (ORCPT ); Sun, 17 Jan 2021 22:29:26 -0500 Received: from mga18.intel.com ([134.134.136.126]:60995 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731683AbhARD3V (ORCPT ); Sun, 17 Jan 2021 22:29:21 -0500 IronPort-SDR: EOybH/EI6pnY4WTOPB8tCyoRmzhgivZ4lPZo5zcYl67N2n/FNnFVwEKoXkVNobi3IrnXvfrI4f uryRpHWmzaAA== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="166420880" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="166420880" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:31 -0800 IronPort-SDR: NQepSmyI5tr9Sp9MBh30H4/zJk5eegDk7ztEnKT925lzETntfSpRpsT/8TSKuDflxY1/xYurF9 9Qpd2OxhPF4g== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151030" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:28 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 13/26] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM Date: Mon, 18 Jan 2021 16:28:06 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson The bare-metal kernel must intercept ECREATE to be able to impose policies on guests. When it does this, the bare-metal kernel runs ECREATE against the userspace mapping of the virtualized EPC. Provide wrappers around __ecreate() and __einit() to hide the ugliness of overloading the ENCLS return value to encode multiple error formats in a single int. KVM will trap-and-execute ECREATE and EINIT as part of SGX virtualization, and on an exception, KVM needs the trapnr so that it can inject the correct fault into the guest. Signed-off-by: Sean Christopherson [Kai: Use sgx_update_lepubkeyhash() to update pubkey hash MSRs.] Signed-off-by: Kai Huang --- v1->v2: - Refined commit msg based on Dave's comment. - Added comment to explain why to use __uaccess_xxx(). --- arch/x86/include/asm/sgx.h | 16 +++++++++ arch/x86/kernel/cpu/sgx/virt.c | 61 ++++++++++++++++++++++++++++++++++ 2 files changed, 77 insertions(+) create mode 100644 arch/x86/include/asm/sgx.h diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h new file mode 100644 index 000000000000..0d643b985085 --- /dev/null +++ b/arch/x86/include/asm/sgx.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_SGX_H +#define _ASM_X86_SGX_H + +#include + +#ifdef CONFIG_X86_SGX_VIRTUALIZATION +struct sgx_pageinfo; + +int sgx_virt_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, + int *trapnr); +int sgx_virt_einit(void __user *sigstruct, void __user *token, + void __user *secs, u64 *lepubkeyhash, int *trapnr); +#endif + +#endif /* _ASM_X86_SGX_H */ diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c index 1e8620f20651..97f02e5235ca 100644 --- a/arch/x86/kernel/cpu/sgx/virt.c +++ b/arch/x86/kernel/cpu/sgx/virt.c @@ -253,3 +253,64 @@ int __init sgx_virt_epc_init(void) return misc_register(&sgx_virt_epc_dev); } + +int sgx_virt_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, + int *trapnr) +{ + int ret; + + /* + * @secs is userspace address, and it's not guaranteed @secs points at + * an actual EPC page. It's also possible to generate a kernel mapping + * to physical EPC page by resolving PFN but using __uaccess_xx() is + * simpler. + */ + __uaccess_begin(); + ret = __ecreate(pageinfo, (void *)secs); + __uaccess_end(); + + if (encls_faulted(ret)) { + *trapnr = ENCLS_TRAPNR(ret); + return -EFAULT; + } + + /* ECREATE doesn't return an error code, it faults or succeeds. */ + WARN_ON_ONCE(ret); + return 0; +} +EXPORT_SYMBOL_GPL(sgx_virt_ecreate); + +static int __sgx_virt_einit(void __user *sigstruct, void __user *token, + void __user *secs) +{ + int ret; + + __uaccess_begin(); + ret = __einit((void *)sigstruct, (void *)token, (void *)secs); + __uaccess_end(); + return ret; +} + +int sgx_virt_einit(void __user *sigstruct, void __user *token, + void __user *secs, u64 *lepubkeyhash, int *trapnr) +{ + int ret; + + if (!boot_cpu_has(X86_FEATURE_SGX_LC)) { + ret = __sgx_virt_einit(sigstruct, token, secs); + } else { + preempt_disable(); + + sgx_update_lepubkeyhash(lepubkeyhash); + + ret = __sgx_virt_einit(sigstruct, token, secs); + preempt_enable(); + } + + if (encls_faulted(ret)) { + *trapnr = ENCLS_TRAPNR(ret); + return -EFAULT; + } + return ret; +} +EXPORT_SYMBOL_GPL(sgx_virt_einit); From patchwork Mon Jan 18 03:28:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026333 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2F30C433DB for ; Mon, 18 Jan 2021 03:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C9B7224B1 for ; Mon, 18 Jan 2021 03:29:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731679AbhARD31 (ORCPT ); Sun, 17 Jan 2021 22:29:27 -0500 Received: from mga18.intel.com ([134.134.136.126]:61000 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731667AbhARD3W (ORCPT ); Sun, 17 Jan 2021 22:29:22 -0500 IronPort-SDR: 6OTVqRe+9PccTujH+8ovErHDRuIsIa/irNwZUHN9GrwiVdndazPxRlFVRsgzjYiK7pRy9/Wm6y PruEYUzZD13A== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="166420885" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="166420885" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:35 -0800 IronPort-SDR: jFMQsQZT52lGW4LkZqYaeYdzScDiFWY0NiTz5w8kloYcZdrm2npK71Qf5OUMKEali6Q7rmgGUG Ax5HwHmOAHjA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151039" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:31 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v2 14/26] x86/sgx: Move provisioning device creation out of SGX driver Date: Mon, 18 Jan 2021 16:28:07 +1300 Message-Id: <4aeb65be69701a4a6e7d479ad3563bf7a9f052d5.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson And extract sgx_set_attribute() out of sgx_ioc_enclave_provision() and export it as symbol for KVM to use. Provisioning key is sensitive. SGX driver only allows to create enclave which can access provisioning key when enclave creator has permission to open /dev/sgx_provision. It should apply to VM as well, as provisioning key is platform specific, thus unrestricted VM can also potentially compromise provisioning key. Move provisioning device creation out of sgx_drv_init() to sgx_init() as preparation for adding SGX virtualization support, so that even SGX driver is not enabled due to flexible launch control is not available, SGX virtualization can still be enabled, and use it to restrict VM's capability of being able to access provisioning key. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/include/asm/sgx.h | 3 +++ arch/x86/kernel/cpu/sgx/driver.c | 17 ------------ arch/x86/kernel/cpu/sgx/ioctl.c | 16 ++---------- arch/x86/kernel/cpu/sgx/main.c | 45 +++++++++++++++++++++++++++++++- 4 files changed, 49 insertions(+), 32 deletions(-) diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h index 0d643b985085..795d724fab87 100644 --- a/arch/x86/include/asm/sgx.h +++ b/arch/x86/include/asm/sgx.h @@ -4,6 +4,9 @@ #include +int sgx_set_attribute(unsigned long *allowed_attributes, + unsigned int attribute_fd); + #ifdef CONFIG_X86_SGX_VIRTUALIZATION struct sgx_pageinfo; diff --git a/arch/x86/kernel/cpu/sgx/driver.c b/arch/x86/kernel/cpu/sgx/driver.c index f2eac41bb4ff..4f3241109bda 100644 --- a/arch/x86/kernel/cpu/sgx/driver.c +++ b/arch/x86/kernel/cpu/sgx/driver.c @@ -133,10 +133,6 @@ static const struct file_operations sgx_encl_fops = { .get_unmapped_area = sgx_get_unmapped_area, }; -const struct file_operations sgx_provision_fops = { - .owner = THIS_MODULE, -}; - static struct miscdevice sgx_dev_enclave = { .minor = MISC_DYNAMIC_MINOR, .name = "sgx_enclave", @@ -144,13 +140,6 @@ static struct miscdevice sgx_dev_enclave = { .fops = &sgx_encl_fops, }; -static struct miscdevice sgx_dev_provision = { - .minor = MISC_DYNAMIC_MINOR, - .name = "sgx_provision", - .nodename = "sgx_provision", - .fops = &sgx_provision_fops, -}; - int __init sgx_drv_init(void) { unsigned int eax, ebx, ecx, edx; @@ -184,11 +173,5 @@ int __init sgx_drv_init(void) if (ret) return ret; - ret = misc_register(&sgx_dev_provision); - if (ret) { - misc_deregister(&sgx_dev_enclave); - return ret; - } - return 0; } diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index 1bae754268d1..4714de12422d 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -2,6 +2,7 @@ /* Copyright(c) 2016-20 Intel Corporation. */ #include +#include #include #include #include @@ -664,24 +665,11 @@ static long sgx_ioc_enclave_init(struct sgx_encl *encl, void __user *arg) static long sgx_ioc_enclave_provision(struct sgx_encl *encl, void __user *arg) { struct sgx_enclave_provision params; - struct file *file; if (copy_from_user(¶ms, arg, sizeof(params))) return -EFAULT; - file = fget(params.fd); - if (!file) - return -EINVAL; - - if (file->f_op != &sgx_provision_fops) { - fput(file); - return -EINVAL; - } - - encl->attributes_mask |= SGX_ATTR_PROVISIONKEY; - - fput(file); - return 0; + return sgx_set_attribute(&encl->attributes_mask, params.fd); } long sgx_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 1cf1f0f058b8..e14ddfa9b78b 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -1,14 +1,18 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright(c) 2016-20 Intel Corporation. */ +#include #include #include #include +#include #include #include #include #include #include +#include +#include #include "driver.h" #include "encl.h" #include "encls.h" @@ -705,6 +709,38 @@ void sgx_update_lepubkeyhash(u64 *lepubkeyhash) wrmsrl(MSR_IA32_SGXLEPUBKEYHASH0 + i, lepubkeyhash[i]); } +const struct file_operations sgx_provision_fops = { + .owner = THIS_MODULE, +}; + +static struct miscdevice sgx_dev_provision = { + .minor = MISC_DYNAMIC_MINOR, + .name = "sgx_provision", + .nodename = "sgx_provision", + .fops = &sgx_provision_fops, +}; + +int sgx_set_attribute(unsigned long *allowed_attributes, + unsigned int attribute_fd) +{ + struct file *file; + + file = fget(attribute_fd); + if (!file) + return -EINVAL; + + if (file->f_op != &sgx_provision_fops) { + fput(file); + return -EINVAL; + } + + *allowed_attributes |= SGX_ATTR_PROVISIONKEY; + + fput(file); + return 0; +} +EXPORT_SYMBOL_GPL(sgx_set_attribute); + static void __init sgx_init(void) { int ret; @@ -719,13 +755,20 @@ static void __init sgx_init(void) if (!sgx_page_reclaimer_init()) goto err_page_cache; + ret = misc_register(&sgx_dev_provision); + if (ret) + goto err_kthread; + /* Success if the native *or* virtual EPC driver initialized cleanly. */ ret = !!sgx_drv_init() & !!sgx_virt_epc_init(); if (ret) - goto err_kthread; + goto err_provision; return; +err_provision: + misc_deregister(&sgx_dev_provision); + err_kthread: kthread_stop(ksgxd_tsk); From patchwork Mon Jan 18 03:28:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026335 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12EFEC433E0 for ; Mon, 18 Jan 2021 03:29:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7ED2224B1 for ; Mon, 18 Jan 2021 03:29:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731697AbhARD3j (ORCPT ); Sun, 17 Jan 2021 22:29:39 -0500 Received: from mga12.intel.com ([192.55.52.136]:16939 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731693AbhARD3b (ORCPT ); Sun, 17 Jan 2021 22:29:31 -0500 IronPort-SDR: +DHWCmgncIwfEeiRWMv4VPAUke+cF6yRwfNFOzdeo/SX0Ig+m+6Odz0cmphyOMyaOBe1q5jX0r smhrGQmvHPKw== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933890" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933890" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:49 -0800 IronPort-SDR: WDZ/5WIY4vBukRZdY7AB059Ig6nyXRnGKiM+ectcKLWR4GzM878IjuwW1k6NhahgtSXvBAxOUV 5URWr/A58Acw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151083" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:45 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 15/26] KVM: VMX: Convert vcpu_vmx.exit_reason to a union Date: Mon, 18 Jan 2021 16:28:26 +1300 Message-Id: <72e2f0e0fb28af55cb11f259eb5bc9e034fb705c.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Convert vcpu_vmx.exit_reason from a u32 to a union (of size u32). The full VM_EXIT_REASON field is comprised of a 16-bit basic exit reason in bits 15:0, and single-bit modifiers in bits 31:16. Historically, KVM has only had to worry about handling the "failed VM-Entry" modifier, which could only be set in very specific flows and required dedicated handling. I.e. manually stripping the FAILED_VMENTRY bit was a somewhat viable approach. But even with only a single bit to worry about, KVM has had several bugs related to comparing a basic exit reason against the full exit reason store in vcpu_vmx. Upcoming Intel features, e.g. SGX, will add new modifier bits that can be set on more or less any VM-Exit, as opposed to the significantly more restricted FAILED_VMENTRY, i.e. correctly handling everything in one-off flows isn't scalable. Tracking exit reason in a union forces code to explicitly choose between consuming the full exit reason and the basic exit, and is a convenient way to document and access the modifiers. No functional change intended. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/kvm/vmx/nested.c | 42 +++++++++++++++--------- arch/x86/kvm/vmx/vmx.c | 68 ++++++++++++++++++++------------------- arch/x86/kvm/vmx/vmx.h | 25 +++++++++++++- 3 files changed, 86 insertions(+), 49 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 0fbb46990dfc..f112c2482887 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3311,7 +3311,11 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12 = get_vmcs12(vcpu); enum vm_entry_failure_code entry_failure_code; bool evaluate_pending_interrupts; - u32 exit_reason, failed_index; + u32 failed_index; + union vmx_exit_reason exit_reason = { + .basic = -1, + .failed_vmentry = 1, + }; if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu)) kvm_vcpu_flush_tlb_current(vcpu); @@ -3363,7 +3367,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, if (nested_vmx_check_guest_state(vcpu, vmcs12, &entry_failure_code)) { - exit_reason = EXIT_REASON_INVALID_STATE; + exit_reason.basic = EXIT_REASON_INVALID_STATE; vmcs12->exit_qualification = entry_failure_code; goto vmentry_fail_vmexit; } @@ -3374,7 +3378,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, vcpu->arch.tsc_offset += vmcs12->tsc_offset; if (prepare_vmcs02(vcpu, vmcs12, &entry_failure_code)) { - exit_reason = EXIT_REASON_INVALID_STATE; + exit_reason.basic = EXIT_REASON_INVALID_STATE; vmcs12->exit_qualification = entry_failure_code; goto vmentry_fail_vmexit_guest_mode; } @@ -3384,7 +3388,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, vmcs12->vm_entry_msr_load_addr, vmcs12->vm_entry_msr_load_count); if (failed_index) { - exit_reason = EXIT_REASON_MSR_LOAD_FAIL; + exit_reason.basic = EXIT_REASON_MSR_LOAD_FAIL; vmcs12->exit_qualification = failed_index; goto vmentry_fail_vmexit_guest_mode; } @@ -3452,7 +3456,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, return NVMX_VMENTRY_VMEXIT; load_vmcs12_host_state(vcpu, vmcs12); - vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY; + vmcs12->vm_exit_reason = exit_reason.full; if (enable_shadow_vmcs || vmx->nested.hv_evmcs) vmx->nested.need_vmcs12_to_shadow_sync = true; return NVMX_VMENTRY_VMEXIT; @@ -5540,7 +5544,12 @@ static int handle_vmfunc(struct kvm_vcpu *vcpu) return kvm_skip_emulated_instruction(vcpu); fail: - nested_vmx_vmexit(vcpu, vmx->exit_reason, + /* + * This is effectively a reflected VM-Exit, as opposed to a synthesized + * nested VM-Exit. Pass the original exit reason, i.e. don't hardcode + * EXIT_REASON_VMFUNC as the exit reason. + */ + nested_vmx_vmexit(vcpu, vmx->exit_reason.full, vmx_get_intr_info(vcpu), vmx_get_exit_qual(vcpu)); return 1; @@ -5608,7 +5617,8 @@ static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu, * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps. */ static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu, - struct vmcs12 *vmcs12, u32 exit_reason) + struct vmcs12 *vmcs12, + union vmx_exit_reason exit_reason) { u32 msr_index = kvm_rcx_read(vcpu); gpa_t bitmap; @@ -5622,7 +5632,7 @@ static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu, * First we need to figure out which of the four to use: */ bitmap = vmcs12->msr_bitmap; - if (exit_reason == EXIT_REASON_MSR_WRITE) + if (exit_reason.basic == EXIT_REASON_MSR_WRITE) bitmap += 2048; if (msr_index >= 0xc0000000) { msr_index -= 0xc0000000; @@ -5759,11 +5769,12 @@ static bool nested_vmx_exit_handled_mtf(struct vmcs12 *vmcs12) * Return true if L0 wants to handle an exit from L2 regardless of whether or not * L1 wants the exit. Only call this when in is_guest_mode (L2). */ -static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason) +static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, + union vmx_exit_reason exit_reason) { u32 intr_info; - switch ((u16)exit_reason) { + switch (exit_reason.basic) { case EXIT_REASON_EXCEPTION_NMI: intr_info = vmx_get_intr_info(vcpu); if (is_nmi(intr_info)) @@ -5819,12 +5830,13 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason) * Return 1 if L1 wants to intercept an exit from L2. Only call this when in * is_guest_mode (L2). */ -static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason) +static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu, + union vmx_exit_reason exit_reason) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); u32 intr_info; - switch ((u16)exit_reason) { + switch (exit_reason.basic) { case EXIT_REASON_EXCEPTION_NMI: intr_info = vmx_get_intr_info(vcpu); if (is_nmi(intr_info)) @@ -5943,7 +5955,7 @@ static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason) bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); - u32 exit_reason = vmx->exit_reason; + union vmx_exit_reason exit_reason = vmx->exit_reason; unsigned long exit_qual; u32 exit_intr_info; @@ -5962,7 +5974,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu) goto reflect_vmexit; } - trace_kvm_nested_vmexit(exit_reason, vcpu, KVM_ISA_VMX); + trace_kvm_nested_vmexit(exit_reason.full, vcpu, KVM_ISA_VMX); /* If L0 (KVM) wants the exit, it trumps L1's desires. */ if (nested_vmx_l0_wants_exit(vcpu, exit_reason)) @@ -5988,7 +6000,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu) exit_qual = vmx_get_exit_qual(vcpu); reflect_vmexit: - nested_vmx_vmexit(vcpu, exit_reason, exit_intr_info, exit_qual); + nested_vmx_vmexit(vcpu, exit_reason.full, exit_intr_info, exit_qual); return true; } diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 2af05d3b0590..746b87375aff 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1577,7 +1577,7 @@ static int skip_emulated_instruction(struct kvm_vcpu *vcpu) * i.e. we end up advancing IP with some random value. */ if (!static_cpu_has(X86_FEATURE_HYPERVISOR) || - to_vmx(vcpu)->exit_reason != EXIT_REASON_EPT_MISCONFIG) { + to_vmx(vcpu)->exit_reason.basic != EXIT_REASON_EPT_MISCONFIG) { orig_rip = kvm_rip_read(vcpu); rip = orig_rip + vmcs_read32(VM_EXIT_INSTRUCTION_LEN); #ifdef CONFIG_X86_64 @@ -5667,7 +5667,7 @@ static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2, struct vcpu_vmx *vmx = to_vmx(vcpu); *info1 = vmx_get_exit_qual(vcpu); - if (!(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) { + if (!vmx->exit_reason.failed_vmentry) { *info2 = vmx->idt_vectoring_info; *intr_info = vmx_get_intr_info(vcpu); if (is_exception_with_error_code(*intr_info)) @@ -5911,8 +5911,9 @@ void dump_vmcs(void) static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) { struct vcpu_vmx *vmx = to_vmx(vcpu); - u32 exit_reason = vmx->exit_reason; + union vmx_exit_reason exit_reason = vmx->exit_reason; u32 vectoring_info = vmx->idt_vectoring_info; + u16 exit_handler_index; /* * Flush logged GPAs PML buffer, this will make dirty_bitmap more @@ -5954,11 +5955,11 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) return 1; } - if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { + if (exit_reason.failed_vmentry) { dump_vmcs(); vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason - = exit_reason; + = exit_reason.full; vcpu->run->fail_entry.cpu = vcpu->arch.last_vmentry_cpu; return 0; } @@ -5980,18 +5981,18 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) * will cause infinite loop. */ if ((vectoring_info & VECTORING_INFO_VALID_MASK) && - (exit_reason != EXIT_REASON_EXCEPTION_NMI && - exit_reason != EXIT_REASON_EPT_VIOLATION && - exit_reason != EXIT_REASON_PML_FULL && - exit_reason != EXIT_REASON_APIC_ACCESS && - exit_reason != EXIT_REASON_TASK_SWITCH)) { + (exit_reason.basic != EXIT_REASON_EXCEPTION_NMI && + exit_reason.basic != EXIT_REASON_EPT_VIOLATION && + exit_reason.basic != EXIT_REASON_PML_FULL && + exit_reason.basic != EXIT_REASON_APIC_ACCESS && + exit_reason.basic != EXIT_REASON_TASK_SWITCH)) { vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_DELIVERY_EV; vcpu->run->internal.ndata = 3; vcpu->run->internal.data[0] = vectoring_info; - vcpu->run->internal.data[1] = exit_reason; + vcpu->run->internal.data[1] = exit_reason.full; vcpu->run->internal.data[2] = vcpu->arch.exit_qualification; - if (exit_reason == EXIT_REASON_EPT_MISCONFIG) { + if (exit_reason.basic == EXIT_REASON_EPT_MISCONFIG) { vcpu->run->internal.ndata++; vcpu->run->internal.data[3] = vmcs_read64(GUEST_PHYSICAL_ADDRESS); @@ -6023,38 +6024,39 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) if (exit_fastpath != EXIT_FASTPATH_NONE) return 1; - if (exit_reason >= kvm_vmx_max_exit_handlers) + if (exit_reason.basic >= kvm_vmx_max_exit_handlers) goto unexpected_vmexit; #ifdef CONFIG_RETPOLINE - if (exit_reason == EXIT_REASON_MSR_WRITE) + if (exit_reason.basic == EXIT_REASON_MSR_WRITE) return kvm_emulate_wrmsr(vcpu); - else if (exit_reason == EXIT_REASON_PREEMPTION_TIMER) + else if (exit_reason.basic == EXIT_REASON_PREEMPTION_TIMER) return handle_preemption_timer(vcpu); - else if (exit_reason == EXIT_REASON_INTERRUPT_WINDOW) + else if (exit_reason.basic == EXIT_REASON_INTERRUPT_WINDOW) return handle_interrupt_window(vcpu); - else if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) + else if (exit_reason.basic == EXIT_REASON_EXTERNAL_INTERRUPT) return handle_external_interrupt(vcpu); - else if (exit_reason == EXIT_REASON_HLT) + else if (exit_reason.basic == EXIT_REASON_HLT) return kvm_emulate_halt(vcpu); - else if (exit_reason == EXIT_REASON_EPT_MISCONFIG) + else if (exit_reason.basic == EXIT_REASON_EPT_MISCONFIG) return handle_ept_misconfig(vcpu); #endif - exit_reason = array_index_nospec(exit_reason, - kvm_vmx_max_exit_handlers); - if (!kvm_vmx_exit_handlers[exit_reason]) + exit_handler_index = array_index_nospec((u16)exit_reason.basic, + kvm_vmx_max_exit_handlers); + if (!kvm_vmx_exit_handlers[exit_handler_index]) goto unexpected_vmexit; - return kvm_vmx_exit_handlers[exit_reason](vcpu); + return kvm_vmx_exit_handlers[exit_handler_index](vcpu); unexpected_vmexit: - vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n", exit_reason); + vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n", + exit_reason.full); dump_vmcs(); vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; vcpu->run->internal.ndata = 2; - vcpu->run->internal.data[0] = exit_reason; + vcpu->run->internal.data[0] = exit_reason.full; vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu; return 0; } @@ -6373,9 +6375,9 @@ static void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); - if (vmx->exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) + if (vmx->exit_reason.basic == EXIT_REASON_EXTERNAL_INTERRUPT) handle_external_interrupt_irqoff(vcpu); - else if (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI) + else if (vmx->exit_reason.basic == EXIT_REASON_EXCEPTION_NMI) handle_exception_nmi_irqoff(vmx); } @@ -6567,7 +6569,7 @@ void noinstr vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp) static fastpath_t vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu) { - switch (to_vmx(vcpu)->exit_reason) { + switch (to_vmx(vcpu)->exit_reason.basic) { case EXIT_REASON_MSR_WRITE: return handle_fastpath_set_msr_irqoff(vcpu); case EXIT_REASON_PREEMPTION_TIMER: @@ -6766,17 +6768,17 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu) vmx->idt_vectoring_info = 0; if (unlikely(vmx->fail)) { - vmx->exit_reason = 0xdead; + vmx->exit_reason.full = 0xdead; return EXIT_FASTPATH_NONE; } - vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); - if (unlikely((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)) + vmx->exit_reason.full = vmcs_read32(VM_EXIT_REASON); + if (unlikely(vmx->exit_reason.basic == EXIT_REASON_MCE_DURING_VMENTRY)) kvm_machine_check(); - trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX); + trace_kvm_exit(vmx->exit_reason.full, vcpu, KVM_ISA_VMX); - if (unlikely(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) + if (unlikely(vmx->exit_reason.failed_vmentry)) return EXIT_FASTPATH_NONE; vmx->loaded_vmcs->launched = 1; diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 9d3a557949ac..903f246b5abd 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -70,6 +70,29 @@ struct pt_desc { struct pt_ctx guest; }; +union vmx_exit_reason { + struct { + u32 basic : 16; + u32 reserved16 : 1; + u32 reserved17 : 1; + u32 reserved18 : 1; + u32 reserved19 : 1; + u32 reserved20 : 1; + u32 reserved21 : 1; + u32 reserved22 : 1; + u32 reserved23 : 1; + u32 reserved24 : 1; + u32 reserved25 : 1; + u32 reserved26 : 1; + u32 sgx_enclave_mode : 1; + u32 smi_pending_mtf : 1; + u32 smi_from_vmx_root : 1; + u32 reserved30 : 1; + u32 failed_vmentry : 1; + }; + u32 full; +}; + /* * The nested_vmx structure is part of vcpu_vmx, and holds information we need * for correct emulation of VMX (i.e., nested VMX) on this vcpu. @@ -244,7 +267,7 @@ struct vcpu_vmx { int vpid; bool emulation_required; - u32 exit_reason; + union vmx_exit_reason exit_reason; /* Posted interrupt descriptor */ struct pi_desc pi_desc; From patchwork Mon Jan 18 03:28:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026337 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A0A2C433E6 for ; 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d="scan'208";a="573151089" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:49 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 16/26] KVM: x86: Export kvm_mmu_gva_to_gpa_{read,write}() for SGX (VMX) Date: Mon, 18 Jan 2021 16:28:27 +1300 Message-Id: <347d84df280cc326ebdb097ab3a30aed2818ae8c.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Export the gva_to_gpa() helpers for use by SGX virtualization when executing ENCLS[ECREATE] and ENCLS[EINIT] on behalf of the guest. To execute ECREATE and EINIT, KVM must obtain the GPA of the target Secure Enclave Control Structure (SECS) in order to get its corresponding HVA. Because the SECS must reside in the Enclave Page Cache (EPC), copying the SECS's data to a host-controlled buffer via existing exported helpers is not a viable option as the EPC is not readable or writable by the kernel. SGX virtualization will also use gva_to_gpa() to obtain HVAs for non-EPC pages in order to pass user pointers directly to ECREATE and EINIT, which avoids having to copy pages worth of data into the kernel. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang Acked-by: Jarkko Sakkinen --- arch/x86/kvm/x86.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9a8969a6dd06..5ca7b181a3ae 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5891,6 +5891,7 @@ gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 access = (kvm_x86_ops.get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); } +EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read); gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, struct x86_exception *exception) @@ -5907,6 +5908,7 @@ gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, access |= PFERR_WRITE_MASK; return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); } +EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_write); /* uses this to access any guest's mapped memory without checking CPL */ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, From patchwork Mon Jan 18 03:28:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026339 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62B5EC433DB for ; Mon, 18 Jan 2021 03:29:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2ECC8224B0 for ; Mon, 18 Jan 2021 03:29:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731662AbhARD3v (ORCPT ); Sun, 17 Jan 2021 22:29:51 -0500 Received: from mga12.intel.com ([192.55.52.136]:16949 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731696AbhARD3j (ORCPT ); Sun, 17 Jan 2021 22:29:39 -0500 IronPort-SDR: 6QNkBmELghg3VHbXMuXvCKTa4yNizKlsOHi+SNcAwgCNY6nFLS6QKPpUl83Egs+Fn6gGJ+Lcnr flt/AY3HGe5A== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933897" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933897" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:58 -0800 IronPort-SDR: 4Gc3xJNeRivClE2w0esPKoESXFv5vKwpvGlC4NpCQN1mXvRaqjN8uzYRT1x8ePce06MQL6x54T MxA2av8NU2ZA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151098" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:54 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 17/26] KVM: x86: Define new #PF SGX error code bit Date: Mon, 18 Jan 2021 16:28:28 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Page faults that are signaled by the SGX Enclave Page Cache Map (EPCM), as opposed to the traditional IA32/EPT page tables, set an SGX bit in the error code to indicate that the #PF was induced by SGX. KVM will need to emulate this behavior as part of its trap-and-execute scheme for virtualizing SGX Launch Control, e.g. to inject SGX-induced #PFs if EINIT faults in the host, and to support live migration. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/include/asm/kvm_host.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 3d6616f6f6ef..9581f81e62a4 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -216,6 +216,7 @@ enum x86_intercept_stage; #define PFERR_RSVD_BIT 3 #define PFERR_FETCH_BIT 4 #define PFERR_PK_BIT 5 +#define PFERR_SGX_BIT 15 #define PFERR_GUEST_FINAL_BIT 32 #define PFERR_GUEST_PAGE_BIT 33 @@ -225,6 +226,7 @@ enum x86_intercept_stage; #define PFERR_RSVD_MASK (1U << PFERR_RSVD_BIT) #define PFERR_FETCH_MASK (1U << PFERR_FETCH_BIT) #define PFERR_PK_MASK (1U << PFERR_PK_BIT) +#define PFERR_SGX_MASK (1U << PFERR_SGX_BIT) #define PFERR_GUEST_FINAL_MASK (1ULL << PFERR_GUEST_FINAL_BIT) #define PFERR_GUEST_PAGE_MASK (1ULL << PFERR_GUEST_PAGE_BIT) From patchwork Mon Jan 18 03:28:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026341 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D375C433DB for ; Mon, 18 Jan 2021 03:29:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D896E224B1 for ; Mon, 18 Jan 2021 03:29:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731702AbhARD3y (ORCPT ); Sun, 17 Jan 2021 22:29:54 -0500 Received: from mga12.intel.com ([192.55.52.136]:16939 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731692AbhARD3x (ORCPT ); Sun, 17 Jan 2021 22:29:53 -0500 IronPort-SDR: r0LSn1NakH0NsReBWcPWkrfvWBZYYgdRz2wpGh/7Av3utxbHUmr43igIeDUAqMt1aCimFFWscF h+HZosI0l+QQ== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933903" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933903" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:02 -0800 IronPort-SDR: rVHi8x3Cbzgiyk4M6c9Rw1NZgIo3vxQFme11MY1gvOP3NUdUb56OLYsZJKJon5ty62Y/fnfgXr hqos1HziTwNA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151110" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:28:58 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 18/26] KVM: x86: Add support for reverse CPUID lookup of scattered features Date: Mon, 18 Jan 2021 16:28:29 +1300 Message-Id: <5aea48bc36c55a633b76536515f9e888e9e54423.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Introduce a scheme that allows KVM's CPUID magic to support features that are scattered in the kernel's feature words. To advertise and/or query guest support for CPUID-based features, KVM requires the bit number of an X86_FEATURE_* to match the bit number in its associated CPUID entry. For scattered features, this does not hold true. Add a framework to allow defining KVM-only words, stored in kvm_cpu_caps after the shared kernel caps, that can be used to gather the scattered feature bits by translating X86_FEATURE_* flags into their KVM-defined feature. Note, because reverse_cpuid_check() effectively forces kvm_cpu_caps lookups to be resolved at compile time, there is no runtime cost for translating from kernel-defined to kvm-defined features. More details here: https://lkml.kernel.org/r/X/jxCOLG+HUO4QlZ@google.com Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/kvm/cpuid.c | 32 +++++++++++++++++++++++++++----- arch/x86/kvm/cpuid.h | 39 ++++++++++++++++++++++++++++++++++----- 2 files changed, 61 insertions(+), 10 deletions(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 13036cf0b912..f8037fab8950 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -28,7 +28,7 @@ * Unlike "struct cpuinfo_x86.x86_capability", kvm_cpu_caps doesn't need to be * aligned to sizeof(unsigned long) because it's not accessed via bitops. */ -u32 kvm_cpu_caps[NCAPINTS] __read_mostly; +u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; EXPORT_SYMBOL_GPL(kvm_cpu_caps); static u32 xstate_required_size(u64 xstate_bv, bool compacted) @@ -53,6 +53,7 @@ static u32 xstate_required_size(u64 xstate_bv, bool compacted) } #define F feature_bit +#define SF(name) (boot_cpu_has(X86_FEATURE_##name) ? F(name) : 0) static inline struct kvm_cpuid_entry2 *cpuid_entry2_find( struct kvm_cpuid_entry2 *entries, int nent, u32 function, u32 index) @@ -331,13 +332,13 @@ int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, return r; } -static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask) +/* Mask kvm_cpu_caps for @leaf with the raw CPUID capabilities of this CPU. */ +static __always_inline void __kvm_cpu_cap_mask(enum cpuid_leafs leaf) { const struct cpuid_reg cpuid = x86_feature_cpuid(leaf * 32); struct kvm_cpuid_entry2 entry; reverse_cpuid_check(leaf); - kvm_cpu_caps[leaf] &= mask; cpuid_count(cpuid.function, cpuid.index, &entry.eax, &entry.ebx, &entry.ecx, &entry.edx); @@ -345,6 +346,26 @@ static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask) kvm_cpu_caps[leaf] &= *__cpuid_entry_get_reg(&entry, cpuid.reg); } +static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask) +{ + /* Use the "init" variant for scattered leafs. */ + BUILD_BUG_ON(leaf >= NCAPINTS); + + kvm_cpu_caps[leaf] &= mask; + + __kvm_cpu_cap_mask(leaf); +} + +static __always_inline void kvm_cpu_cap_init(enum cpuid_leafs leaf, u32 mask) +{ + /* Use the "mask" variant for hardwared-defined leafs. */ + BUILD_BUG_ON(leaf < NCAPINTS); + + kvm_cpu_caps[leaf] = mask; + + __kvm_cpu_cap_mask(leaf); +} + void kvm_set_cpu_caps(void) { unsigned int f_nx = is_efer_nx() ? F(NX) : 0; @@ -355,12 +376,13 @@ void kvm_set_cpu_caps(void) unsigned int f_gbpages = 0; unsigned int f_lm = 0; #endif + memset(kvm_cpu_caps, 0, sizeof(kvm_cpu_caps)); - BUILD_BUG_ON(sizeof(kvm_cpu_caps) > + BUILD_BUG_ON(sizeof(kvm_cpu_caps) - (NKVMCAPINTS * sizeof(*kvm_cpu_caps)) > sizeof(boot_cpu_data.x86_capability)); memcpy(&kvm_cpu_caps, &boot_cpu_data.x86_capability, - sizeof(kvm_cpu_caps)); + sizeof(kvm_cpu_caps) - (NKVMCAPINTS * sizeof(*kvm_cpu_caps))); kvm_cpu_cap_mask(CPUID_1_ECX, /* diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index dc921d76e42e..2041e2f07347 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -7,7 +7,20 @@ #include #include -extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly; +/* + * Hardware-defined CPUID leafs that are scattered in the kernel, but need to + * be directly used by KVM. Note, these word values conflict with the kernel's + * "bug" caps, but KVM doesn't use those. + */ +enum kvm_only_cpuid_leafs { + NR_KVM_CPU_CAPS = NCAPINTS, + + NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS, +}; + +#define X86_KVM_FEATURE(w, f) ((w)*32 + (f)) + +extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; void kvm_set_cpu_caps(void); void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu); @@ -83,6 +96,20 @@ static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); } +/* + * Translate feature bits that are scattered in the kernel's cpufeatures word + * into KVM feature words that align with hardware's definitions. + */ +static __always_inline u32 __feature_translate(int x86_feature) +{ + return x86_feature; +} + +static __always_inline u32 __feature_leaf(int x86_feature) +{ + return __feature_translate(x86_feature) / 32; +} + /* * Retrieve the bit mask from an X86_FEATURE_* definition. Features contain * the hardware defined bit number (stored in bits 4:0) and a software defined @@ -91,6 +118,8 @@ static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) */ static __always_inline u32 __feature_bit(int x86_feature) { + x86_feature = __feature_translate(x86_feature); + reverse_cpuid_check(x86_feature / 32); return 1 << (x86_feature & 31); } @@ -99,7 +128,7 @@ static __always_inline u32 __feature_bit(int x86_feature) static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature) { - unsigned int x86_leaf = x86_feature / 32; + unsigned int x86_leaf = __feature_leaf(x86_feature); reverse_cpuid_check(x86_leaf); return reverse_cpuid[x86_leaf]; @@ -291,7 +320,7 @@ static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) { - unsigned int x86_leaf = x86_feature / 32; + unsigned int x86_leaf = __feature_leaf(x86_feature); reverse_cpuid_check(x86_leaf); kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); @@ -299,7 +328,7 @@ static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) { - unsigned int x86_leaf = x86_feature / 32; + unsigned int x86_leaf = __feature_leaf(x86_feature); reverse_cpuid_check(x86_leaf); kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); @@ -307,7 +336,7 @@ static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) { - unsigned int x86_leaf = x86_feature / 32; + unsigned int x86_leaf = __feature_leaf(x86_feature); reverse_cpuid_check(x86_leaf); return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); From patchwork Mon Jan 18 03:28:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026343 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8E0CC433E0 for ; Mon, 18 Jan 2021 03:30:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E284224B8 for ; Mon, 18 Jan 2021 03:30:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731742AbhARDaA (ORCPT ); Sun, 17 Jan 2021 22:30:00 -0500 Received: from mga12.intel.com ([192.55.52.136]:16942 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731720AbhARD35 (ORCPT ); Sun, 17 Jan 2021 22:29:57 -0500 IronPort-SDR: MCdmIiF9DYmvROS4P1mq9tuA8hA4wi3Gnp9gw5URTdzKiKYumpWhSGgVxe//LgD2+71ow9f02n sMGdsCbhW3ig== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933910" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933910" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:07 -0800 IronPort-SDR: ZjwA4y6B/4nSsnzP5bIGNNGNPy8vKdsFvJFxJgN91FB3odFlE8HcI2vWD4yTIsmktc+KtDitDF ardhpoMPC+KQ== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151133" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:02 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 19/26] KVM: x86: Add reverse-CPUID lookup support for scattered SGX features Date: Mon, 18 Jan 2021 16:28:30 +1300 Message-Id: <50807c43185f20c03c279ae4bf63911092b1d778.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Define a new KVM-only feature word for advertising and querying SGX sub-features in CPUID.0x12.0x0.EAX. Because SGX1 and SGX2 are scattered in the kernel's feature word, they need to be translated so that the bit numbers match those of hardware. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/kvm/cpuid.h | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index 2041e2f07347..f55701ef58fc 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -13,13 +13,18 @@ * "bug" caps, but KVM doesn't use those. */ enum kvm_only_cpuid_leafs { - NR_KVM_CPU_CAPS = NCAPINTS, + CPUID_12_EAX = NCAPINTS, + NR_KVM_CPU_CAPS, NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS, }; #define X86_KVM_FEATURE(w, f) ((w)*32 + (f)) +/* Intel-defined SGX sub-features, CPUID level 0x12 (EAX). */ +#define __X86_FEATURE_SGX1 X86_KVM_FEATURE(CPUID_12_EAX, 0) +#define __X86_FEATURE_SGX2 X86_KVM_FEATURE(CPUID_12_EAX, 1) + extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; void kvm_set_cpu_caps(void); @@ -76,6 +81,7 @@ static const struct cpuid_reg reverse_cpuid[] = { [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX}, [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, + [CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX}, }; /* @@ -102,6 +108,11 @@ static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) */ static __always_inline u32 __feature_translate(int x86_feature) { + if (x86_feature == X86_FEATURE_SGX1) + return __X86_FEATURE_SGX1; + else if (x86_feature == X86_FEATURE_SGX2) + return __X86_FEATURE_SGX2; + return x86_feature; } From patchwork Mon Jan 18 03:28:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026345 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83634C433DB for ; Mon, 18 Jan 2021 03:30:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D4B0224B0 for ; Mon, 18 Jan 2021 03:30:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731727AbhARDaW (ORCPT ); Sun, 17 Jan 2021 22:30:22 -0500 Received: from mga12.intel.com ([192.55.52.136]:16949 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731738AbhARDaA (ORCPT ); Sun, 17 Jan 2021 22:30:00 -0500 IronPort-SDR: sqRkIMu2teHXpUUWcUf4kp50Tel6RCOuoFojEU7PP61V1atTyaDfhMGtDOzZ2VJ5E1TyeIRkGS DrXXWJ0toSRg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933915" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933915" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:11 -0800 IronPort-SDR: sN05114G+PrKV795Fsti/+ffQlHDBPd3dtzd3LIxRPUXRBgX05HCvJVutBbM2d08gU8Xg3Ccif Vizxa8U6drkQ== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151140" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:07 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 20/26] KVM: VMX: Add basic handling of VM-Exit from SGX enclave Date: Mon, 18 Jan 2021 16:28:31 +1300 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add support for handling VM-Exits that originate from a guest SGX enclave. In SGX, an "enclave" is a new CPL3-only execution environment, wherein the CPU and memory state is protected by hardware to make the state inaccesible to code running outside of the enclave. When exiting an enclave due to an asynchronous event (from the perspective of the enclave), e.g. exceptions, interrupts, and VM-Exits, the enclave's state is automatically saved and scrubbed (the CPU loads synthetic state), and then reloaded when re-entering the enclave. E.g. after an instruction based VM-Exit from an enclave, vmcs.GUEST_RIP will not contain the RIP of the enclave instruction that trigered VM-Exit, but will instead point to a RIP in the enclave's untrusted runtime (the guest userspace code that coordinates entry/exit to/from the enclave). To help a VMM recognize and handle exits from enclaves, SGX adds bits to existing VMCS fields, VM_EXIT_REASON.VMX_EXIT_REASON_FROM_ENCLAVE and GUEST_INTERRUPTIBILITY_INFO.GUEST_INTR_STATE_ENCLAVE_INTR. Define the new architectural bits, and add a boolean to struct vcpu_vmx to cache VMX_EXIT_REASON_FROM_ENCLAVE. Clear the bit in exit_reason so that checks against exit_reason do not need to account for SGX, e.g. "if (exit_reason == EXIT_REASON_EXCEPTION_NMI)" continues to work. KVM is a largely a passive observer of the new bits, e.g. KVM needs to account for the bits when propagating information to a nested VMM, but otherwise doesn't need to act differently for the majority of VM-Exits from enclaves. The one scenario that is directly impacted is emulation, which is for all intents and purposes impossible[1] since KVM does not have access to the RIP or instruction stream that triggered the VM-Exit. The inability to emulate is a non-issue for KVM, as most instructions that might trigger VM-Exit unconditionally #UD in an enclave (before the VM-Exit check. For the few instruction that conditionally #UD, KVM either never sets the exiting control, e.g. PAUSE_EXITING[2], or sets it if and only if the feature is not exposed to the guest in order to inject a #UD, e.g. RDRAND_EXITING. But, because it is still possible for a guest to trigger emulation, e.g. MMIO, inject a #UD if KVM ever attempts emulation after a VM-Exit from an enclave. This is architecturally accurate for instruction VM-Exits, and for MMIO it's the least bad choice, e.g. it's preferable to killing the VM. In practice, only broken or particularly stupid guests should ever encounter this behavior. Add a WARN in skip_emulated_instruction to detect any attempt to modify the guest's RIP during an SGX enclave VM-Exit as all such flows should either be unreachable or must handle exits from enclaves before getting to skip_emulated_instruction. [1] Impossible for all practical purposes. Not truly impossible since KVM could implement some form of para-virtualization scheme. [2] PAUSE_LOOP_EXITING only affects CPL0 and enclaves exist only at CPL3, so we also don't need to worry about that interaction. Signed-off-by: Sean Christopherson [Kai: Remove unlikely()s suggested by Dave Hansen.] Signed-off-by: Kai Huang --- arch/x86/include/asm/vmx.h | 1 + arch/x86/include/uapi/asm/vmx.h | 1 + arch/x86/kvm/vmx/nested.c | 2 ++ arch/x86/kvm/vmx/vmx.c | 38 +++++++++++++++++++++++++++++++-- 4 files changed, 40 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h index 38ca445a8429..e99021a00eb9 100644 --- a/arch/x86/include/asm/vmx.h +++ b/arch/x86/include/asm/vmx.h @@ -372,6 +372,7 @@ enum vmcs_field { #define GUEST_INTR_STATE_MOV_SS 0x00000002 #define GUEST_INTR_STATE_SMI 0x00000004 #define GUEST_INTR_STATE_NMI 0x00000008 +#define GUEST_INTR_STATE_ENCLAVE_INTR 0x00000010 /* GUEST_ACTIVITY_STATE flags */ #define GUEST_ACTIVITY_ACTIVE 0 diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h index ada955c5ebb6..c7a18eb2a074 100644 --- a/arch/x86/include/uapi/asm/vmx.h +++ b/arch/x86/include/uapi/asm/vmx.h @@ -27,6 +27,7 @@ #define VMX_EXIT_REASONS_FAILED_VMENTRY 0x80000000 +#define VMX_EXIT_REASONS_SGX_ENCLAVE_MODE 0x08000000 #define EXIT_REASON_EXCEPTION_NMI 0 #define EXIT_REASON_EXTERNAL_INTERRUPT 1 diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index f112c2482887..562eab7b0a51 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4126,6 +4126,8 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, { /* update exit information fields: */ vmcs12->vm_exit_reason = vm_exit_reason; + if (to_vmx(vcpu)->exit_reason.sgx_enclave_mode) + vmcs12->vm_exit_reason |= VMX_EXIT_REASONS_SGX_ENCLAVE_MODE; vmcs12->exit_qualification = exit_qualification; vmcs12->vm_exit_intr_info = exit_intr_info; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 746b87375aff..4cb8a3f1374c 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1561,12 +1561,18 @@ static int vmx_rtit_ctl_check(struct kvm_vcpu *vcpu, u64 data) static bool vmx_can_emulate_instruction(struct kvm_vcpu *vcpu, void *insn, int insn_len) { + if (to_vmx(vcpu)->exit_reason.sgx_enclave_mode) { + kvm_queue_exception(vcpu, UD_VECTOR); + return false; + } return true; } static int skip_emulated_instruction(struct kvm_vcpu *vcpu) { + union vmx_exit_reason exit_reason = to_vmx(vcpu)->exit_reason; unsigned long rip, orig_rip; + u32 instr_len; /* * Using VMCS.VM_EXIT_INSTRUCTION_LEN on EPT misconfig depends on @@ -1577,9 +1583,33 @@ static int skip_emulated_instruction(struct kvm_vcpu *vcpu) * i.e. we end up advancing IP with some random value. */ if (!static_cpu_has(X86_FEATURE_HYPERVISOR) || - to_vmx(vcpu)->exit_reason.basic != EXIT_REASON_EPT_MISCONFIG) { + exit_reason.basic != EXIT_REASON_EPT_MISCONFIG) { + instr_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); + + /* + * Emulating an enclave's instructions isn't supported as KVM + * cannot access the enclave's memory or its true RIP, e.g. the + * vmcs.GUEST_RIP points at the exit point of the enclave, not + * the RIP that actually triggered the VM-Exit. But, because + * most instructions that cause VM-Exit will #UD in an enclave, + * most instruction-based VM-Exits simply do not occur. + * + * There are a few exceptions, notably the debug instructions + * INT1ICEBRK and INT3, as they are allowed in debug enclaves + * and generate #DB/#BP as expected, which KVM might intercept. + * But again, the CPU does the dirty work and saves an instr + * length of zero so VMMs don't shoot themselves in the foot. + * WARN if KVM tries to skip a non-zero length instruction on + * a VM-Exit from an enclave. + */ + if (!instr_len) + goto rip_updated; + + WARN(exit_reason.sgx_enclave_mode, + "KVM: skipping instruction after SGX enclave VM-Exit"); + orig_rip = kvm_rip_read(vcpu); - rip = orig_rip + vmcs_read32(VM_EXIT_INSTRUCTION_LEN); + rip = orig_rip + instr_len; #ifdef CONFIG_X86_64 /* * We need to mask out the high 32 bits of RIP if not in 64-bit @@ -1595,6 +1625,7 @@ static int skip_emulated_instruction(struct kvm_vcpu *vcpu) return 0; } +rip_updated: /* skipping an emulated instruction also counts */ vmx_set_interrupt_shadow(vcpu, 0); @@ -5341,6 +5372,9 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu) { gpa_t gpa; + if (!vmx_can_emulate_instruction(vcpu, NULL, 0)) + return 1; + /* * A nested guest cannot optimize MMIO vmexits, because we have an * nGPA here instead of the required GPA. From patchwork Mon Jan 18 03:28:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026347 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E673CC433DB for ; Mon, 18 Jan 2021 03:30:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B605C224B0 for ; Mon, 18 Jan 2021 03:30:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731738AbhARDa3 (ORCPT ); Sun, 17 Jan 2021 22:30:29 -0500 Received: from mga12.intel.com ([192.55.52.136]:16939 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731815AbhARDaJ (ORCPT ); Sun, 17 Jan 2021 22:30:09 -0500 IronPort-SDR: HZAh+uwoZJk/WhKlFJvFrcnxW1YnUGfX+l7UfMAH5IINw6vAdsmV/9ga6I1+LXEbdYF6O2bc3/ PYe5Z9S4XRnw== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933923" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933923" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:16 -0800 IronPort-SDR: 8PuyCmVk7Wj+U5LGfCzNOi1h+RNJ5kCHy5zb/TgfYW9/dszC6QkuDucIr71bzFVBEDQvGCSSSs jT++Izgp/Psg== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151160" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:12 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 21/26] KVM: VMX: Frame in ENCLS handler for SGX virtualization Date: Mon, 18 Jan 2021 16:28:32 +1300 Message-Id: <7958d89cf3836eecfda39ba4b725e2fb6ebc6217.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Introduce sgx.c and sgx.h, along with the framework for handling ENCLS VM-Exits. Add a bool, enable_sgx, that will eventually be wired up to a module param to control whether or not SGX virtualization is enabled at runtime. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/kvm/Makefile | 2 ++ arch/x86/kvm/vmx/sgx.c | 51 ++++++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/vmx/sgx.h | 15 +++++++++++++ arch/x86/kvm/vmx/vmx.c | 9 +++++--- 4 files changed, 74 insertions(+), 3 deletions(-) create mode 100644 arch/x86/kvm/vmx/sgx.c create mode 100644 arch/x86/kvm/vmx/sgx.h diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index 4bd14ab01323..44a32f62832c 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -21,6 +21,8 @@ kvm-y += x86.o emulate.o i8259.o irq.o lapic.o \ kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \ vmx/evmcs.o vmx/nested.o vmx/posted_intr.o +kvm-intel-$(CONFIG_X86_SGX_VIRTUALIZATION) += vmx/sgx.o + kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o svm/sev.o obj-$(CONFIG_KVM) += kvm.o diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c new file mode 100644 index 000000000000..693bf7735308 --- /dev/null +++ b/arch/x86/kvm/vmx/sgx.c @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2016-20 Intel Corporation. */ + +#include +#include + +#include "cpuid.h" +#include "kvm_cache_regs.h" +#include "sgx.h" +#include "vmx.h" +#include "x86.h" + +bool __read_mostly enable_sgx; + +static inline bool encls_leaf_enabled_in_guest(struct kvm_vcpu *vcpu, u32 leaf) +{ + if (!enable_sgx || !guest_cpuid_has(vcpu, X86_FEATURE_SGX)) + return false; + + if (leaf >= ECREATE && leaf <= ETRACK) + return guest_cpuid_has(vcpu, X86_FEATURE_SGX1); + + if (leaf >= EAUG && leaf <= EMODT) + return guest_cpuid_has(vcpu, X86_FEATURE_SGX2); + + return false; +} + +static inline bool sgx_enabled_in_guest_bios(struct kvm_vcpu *vcpu) +{ + const u64 bits = FEAT_CTL_SGX_ENABLED | FEAT_CTL_LOCKED; + + return (to_vmx(vcpu)->msr_ia32_feature_control & bits) == bits; +} + +int handle_encls(struct kvm_vcpu *vcpu) +{ + u32 leaf = (u32)vcpu->arch.regs[VCPU_REGS_RAX]; + + if (!encls_leaf_enabled_in_guest(vcpu, leaf)) { + kvm_queue_exception(vcpu, UD_VECTOR); + } else if (!sgx_enabled_in_guest_bios(vcpu)) { + kvm_inject_gp(vcpu, 0); + } else { + WARN(1, "KVM: unexpected exit on ENCLS[%u]", leaf); + vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; + vcpu->run->hw.hardware_exit_reason = EXIT_REASON_ENCLS; + return 0; + } + return 1; +} diff --git a/arch/x86/kvm/vmx/sgx.h b/arch/x86/kvm/vmx/sgx.h new file mode 100644 index 000000000000..647afc7546bf --- /dev/null +++ b/arch/x86/kvm/vmx/sgx.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __KVM_X86_SGX_H +#define __KVM_X86_SGX_H + +#include + +#ifdef CONFIG_X86_SGX_VIRTUALIZATION +extern bool __read_mostly enable_sgx; + +int handle_encls(struct kvm_vcpu *vcpu); +#else +#define enable_sgx 0 +#endif + +#endif /* __KVM_X86_SGX_H */ diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4cb8a3f1374c..149f472ac9df 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -56,6 +56,7 @@ #include "mmu.h" #include "nested.h" #include "pmu.h" +#include "sgx.h" #include "trace.h" #include "vmcs.h" #include "vmcs12.h" @@ -5623,16 +5624,18 @@ static int handle_vmx_instruction(struct kvm_vcpu *vcpu) return 1; } +#ifndef CONFIG_X86_SGX_VIRTUALIZATION static int handle_encls(struct kvm_vcpu *vcpu) { /* - * SGX virtualization is not yet supported. There is no software - * enable bit for SGX, so we have to trap ENCLS and inject a #UD - * to prevent the guest from executing ENCLS. + * SGX virtualization is disabled. There is no software enable bit for + * SGX, so KVM intercepts all ENCLS leafs and injects a #UD to prevent + * the guest from executing ENCLS (when SGX is supported by hardware). */ kvm_queue_exception(vcpu, UD_VECTOR); return 1; } +#endif /* CONFIG_X86_SGX_VIRTUALIZATION */ /* * The exit handlers return 1 if the exit was handled fully and guest execution From patchwork Mon Jan 18 03:28:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026349 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18F2CC433DB for ; Mon, 18 Jan 2021 03:30:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0B83224B1 for ; Mon, 18 Jan 2021 03:30:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731815AbhARDaf (ORCPT ); Sun, 17 Jan 2021 22:30:35 -0500 Received: from mga12.intel.com ([192.55.52.136]:16942 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731713AbhARDaO (ORCPT ); Sun, 17 Jan 2021 22:30:14 -0500 IronPort-SDR: ASXGHcECnxAAVl4NLDShsfe2RL/nxT2a0eC+AkAn7fbSDm/oZ91JNGflMuhVZ7ScSKd801x7Jq vnMaAUmvOpow== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933927" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933927" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:21 -0800 IronPort-SDR: ucX4PDD9Kwj+YEgE6gLArp5l4eOKegnT89+DTkTMFxmw8HaCUV1e0bCZ7RlgeFvyUU09i3GZoK 6enk0rGrcmqA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151173" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:16 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 22/26] KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions Date: Mon, 18 Jan 2021 16:28:33 +1300 Message-Id: <8b22ca5a13a9e1dbdfedc0ae26bf7c396cc5f8c5.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add an ECREATE handler that will be used to intercept ECREATE for the purpose of enforcing and enclave's MISCSELECT, ATTRIBUTES and XFRM, i.e. to allow userspace to restrict SGX features via CPUID. ECREATE will be intercepted when any of the aforementioned masks diverges from hardware in order to enforce the desired CPUID model, i.e. inject #GP if the guest attempts to set a bit that hasn't been enumerated as allowed-1 in CPUID. Note, access to the PROVISIONKEY is not yet supported. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/include/asm/kvm_host.h | 3 + arch/x86/kvm/vmx/sgx.c | 243 ++++++++++++++++++++++++++++++++ 2 files changed, 246 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 9581f81e62a4..cd71f30fbdd1 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1000,6 +1000,9 @@ struct kvm_arch { struct msr_bitmap_range ranges[16]; } msr_filter; + /* Guest can access the SGX PROVISIONKEY. */ + bool sgx_provisioning_allowed; + struct kvm_pmu_event_filter *pmu_event_filter; struct task_struct *nx_lpage_recovery_thread; diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 693bf7735308..4281045318ac 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -12,6 +12,247 @@ bool __read_mostly enable_sgx; +/* + * ENCLS's memory operands use a fixed segment (DS) and a fixed + * address size based on the mode. Related prefixes are ignored. + */ +static int sgx_get_encls_gva(struct kvm_vcpu *vcpu, unsigned long offset, + int size, int alignment, gva_t *gva) +{ + struct kvm_segment s; + bool fault; + + /* Skip vmcs.GUEST_DS retrieval for 64-bit mode to avoid VMREADs. */ + *gva = offset; + if (!is_long_mode(vcpu)) { + vmx_get_segment(vcpu, &s, VCPU_SREG_DS); + *gva += s.base; + } + + if (!IS_ALIGNED(*gva, alignment)) { + fault = true; + } else if (likely(is_long_mode(vcpu))) { + fault = is_noncanonical_address(*gva, vcpu); + } else { + *gva &= 0xffffffff; + fault = (s.unusable) || + (s.type != 2 && s.type != 3) || + (*gva > s.limit) || + ((s.base != 0 || s.limit != 0xffffffff) && + (((u64)*gva + size - 1) > s.limit + 1)); + } + if (fault) + kvm_inject_gp(vcpu, 0); + return fault ? -EINVAL : 0; +} + +static void sgx_handle_emulation_failure(struct kvm_vcpu *vcpu, u64 addr, + unsigned int size) +{ + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; + vcpu->run->internal.ndata = 2; + vcpu->run->internal.data[0] = addr; + vcpu->run->internal.data[1] = size; +} + +static int sgx_read_hva(struct kvm_vcpu *vcpu, unsigned long hva, void *data, + unsigned int size) +{ + if (__copy_from_user(data, (void __user *)hva, size)) { + sgx_handle_emulation_failure(vcpu, hva, size); + return -EFAULT; + } + + return 0; +} + +static int sgx_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t gva, bool write, + gpa_t *gpa) +{ + struct x86_exception ex; + + if (write) + *gpa = kvm_mmu_gva_to_gpa_write(vcpu, gva, &ex); + else + *gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, &ex); + + if (*gpa == UNMAPPED_GVA) { + kvm_inject_emulated_page_fault(vcpu, &ex); + return -EFAULT; + } + + return 0; +} + +static int sgx_gpa_to_hva(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned long *hva) +{ + *hva = kvm_vcpu_gfn_to_hva(vcpu, PFN_DOWN(gpa)); + if (kvm_is_error_hva(*hva)) { + sgx_handle_emulation_failure(vcpu, gpa, 1); + return -EFAULT; + } + + *hva |= gpa & ~PAGE_MASK; + + return 0; +} + +static int sgx_inject_fault(struct kvm_vcpu *vcpu, gva_t gva, int trapnr) +{ + struct x86_exception ex; + + /* + * A non-EPCM #PF indicates a bad userspace HVA. This *should* check + * for PFEC.SGX and not assume any #PF on SGX2 originated in the EPC, + * but the error code isn't (yet) plumbed through the ENCLS helpers. + */ + if (trapnr == PF_VECTOR && !boot_cpu_has(X86_FEATURE_SGX2)) { + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; + vcpu->run->internal.ndata = 0; + return 0; + } + + /* + * If the guest thinks it's running on SGX2 hardware, inject an SGX + * #PF if the fault matches an EPCM fault signature (#GP on SGX1, + * #PF on SGX2). The assumption is that EPCM faults are much more + * likely than a bad userspace address. + */ + if ((trapnr == PF_VECTOR || !boot_cpu_has(X86_FEATURE_SGX2)) && + guest_cpuid_has(vcpu, X86_FEATURE_SGX2)) { + memset(&ex, 0, sizeof(ex)); + ex.vector = PF_VECTOR; + ex.error_code = PFERR_PRESENT_MASK | PFERR_WRITE_MASK | + PFERR_SGX_MASK; + ex.address = gva; + ex.error_code_valid = true; + ex.nested_page_fault = false; + kvm_inject_page_fault(vcpu, &ex); + } else { + kvm_inject_gp(vcpu, 0); + } + return 1; +} + +static int handle_encls_ecreate(struct kvm_vcpu *vcpu) +{ + unsigned long a_hva, m_hva, x_hva, s_hva, secs_hva; + struct kvm_cpuid_entry2 *sgx_12_0, *sgx_12_1; + gpa_t metadata_gpa, contents_gpa, secs_gpa; + struct sgx_pageinfo pageinfo; + gva_t pageinfo_gva, secs_gva; + u64 attributes, xfrm, size; + struct x86_exception ex; + u8 max_size_log2; + u32 miscselect; + int trapnr, r; + + sgx_12_0 = kvm_find_cpuid_entry(vcpu, 0x12, 0); + sgx_12_1 = kvm_find_cpuid_entry(vcpu, 0x12, 1); + if (!sgx_12_0 || !sgx_12_1) { + kvm_inject_gp(vcpu, 0); + return 1; + } + + if (sgx_get_encls_gva(vcpu, kvm_rbx_read(vcpu), 32, 32, &pageinfo_gva) || + sgx_get_encls_gva(vcpu, kvm_rcx_read(vcpu), 4096, 4096, &secs_gva)) + return 1; + + /* + * Copy the PAGEINFO to local memory, its pointers need to be + * translated, i.e. we need to do a deep copy/translate. + */ + r = kvm_read_guest_virt(vcpu, pageinfo_gva, &pageinfo, + sizeof(pageinfo), &ex); + if (r == X86EMUL_PROPAGATE_FAULT) { + kvm_inject_emulated_page_fault(vcpu, &ex); + return 1; + } else if (r != X86EMUL_CONTINUE) { + sgx_handle_emulation_failure(vcpu, pageinfo_gva, size); + return 0; + } + + /* + * Verify alignment early. This conveniently avoids having to worry + * about page splits on userspace addresses. + */ + if (!IS_ALIGNED(pageinfo.metadata, 64) || + !IS_ALIGNED(pageinfo.contents, 4096)) { + kvm_inject_gp(vcpu, 0); + return 1; + } + + /* + * Translate the SECINFO, SOURCE and SECS pointers from GVA to GPA. + * Resume the guest on failure to inject a #PF. + */ + if (sgx_gva_to_gpa(vcpu, pageinfo.metadata, false, &metadata_gpa) || + sgx_gva_to_gpa(vcpu, pageinfo.contents, false, &contents_gpa) || + sgx_gva_to_gpa(vcpu, secs_gva, true, &secs_gpa)) + return 1; + + /* + * ...and then to HVA. The order of accesses isn't architectural, i.e. + * KVM doesn't have to fully process one address at a time. Exit to + * userspace if a GPA is invalid. + */ + if (sgx_gpa_to_hva(vcpu, metadata_gpa, + (unsigned long *)&pageinfo.metadata) || + sgx_gpa_to_hva(vcpu, contents_gpa, + (unsigned long *)&pageinfo.contents) || + sgx_gpa_to_hva(vcpu, secs_gpa, &secs_hva)) + return 0; + + /* + * Read out select portions of the input SECS to enforce userspace + * restrictions on MISCSELECT, ATTRIBUTES, etc... Note, 'contents' is + * page aligned, i.e. no need to worry about page splits. + */ + m_hva = pageinfo.contents + offsetof(struct sgx_secs, miscselect); + a_hva = pageinfo.contents + offsetof(struct sgx_secs, attributes); + x_hva = pageinfo.contents + offsetof(struct sgx_secs, xfrm); + s_hva = pageinfo.contents + offsetof(struct sgx_secs, size); + + /* Exit to userspace if copying from a host userspace address fails. */ + if (sgx_read_hva(vcpu, m_hva, &miscselect, sizeof(miscselect)) || + sgx_read_hva(vcpu, a_hva, &attributes, sizeof(attributes)) || + sgx_read_hva(vcpu, x_hva, &xfrm, sizeof(xfrm)) || + sgx_read_hva(vcpu, s_hva, &size, sizeof(size))) + return 0; + + /* Enforce restriction of access to the PROVISIONKEY. */ + if (!vcpu->kvm->arch.sgx_provisioning_allowed && + (attributes & SGX_ATTR_PROVISIONKEY)) { + if (sgx_12_1->eax & SGX_ATTR_PROVISIONKEY) + pr_warn_once("KVM: SGX PROVISIONKEY advertised but not allowed\n"); + kvm_inject_gp(vcpu, 0); + return 1; + } + + /* Enforce CPUID restrictions on MISCSELECT, ATTRIBUTES and XFRM. */ + if ((u32)miscselect & ~sgx_12_0->ebx || + (u32)attributes & ~sgx_12_1->eax || + (u32)(attributes >> 32) & ~sgx_12_1->ebx || + (u32)xfrm & ~sgx_12_1->ecx || + (u32)(xfrm >> 32) & ~sgx_12_1->edx) { + kvm_inject_gp(vcpu, 0); + return 1; + } + + /* Enforce CPUID restriction on max enclave size. */ + max_size_log2 = (attributes & SGX_ATTR_MODE64BIT) ? sgx_12_0->edx >> 8 : + sgx_12_0->edx; + if (size >= BIT_ULL(max_size_log2)) + kvm_inject_gp(vcpu, 0); + + if (sgx_virt_ecreate(&pageinfo, (void __user *)secs_hva, &trapnr)) + return sgx_inject_fault(vcpu, secs_gva, trapnr); + + return kvm_skip_emulated_instruction(vcpu); +} + static inline bool encls_leaf_enabled_in_guest(struct kvm_vcpu *vcpu, u32 leaf) { if (!enable_sgx || !guest_cpuid_has(vcpu, X86_FEATURE_SGX)) @@ -42,6 +283,8 @@ int handle_encls(struct kvm_vcpu *vcpu) } else if (!sgx_enabled_in_guest_bios(vcpu)) { kvm_inject_gp(vcpu, 0); } else { + if (leaf == ECREATE) + return handle_encls_ecreate(vcpu); WARN(1, "KVM: unexpected exit on ENCLS[%u]", leaf); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_ENCLS; From patchwork Mon Jan 18 03:28:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026351 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9921FC433DB for ; Mon, 18 Jan 2021 03:31:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67500224B1 for ; Mon, 18 Jan 2021 03:31:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731669AbhARDbE (ORCPT ); Sun, 17 Jan 2021 22:31:04 -0500 Received: from mga12.intel.com ([192.55.52.136]:16949 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731720AbhARDa3 (ORCPT ); Sun, 17 Jan 2021 22:30:29 -0500 IronPort-SDR: 7eW2o/DA6EkQj+QDdA1tn8/V37Wcd43ustY1LssjkqnCGTur4QtHxBm81/u6wrQFeEWRRUlIvV Bo8tBWxqfVvA== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933940" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933940" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:25 -0800 IronPort-SDR: 5c9O/iFQFusZi5tQdoeI4+IrjwnLTbYCYpmLIAQESJv3cdiEAQw84uwLlRrwV42wgNHulMKOD5 NhqDNDlVb0Zw== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151188" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:21 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 23/26] KVM: VMX: Add emulation of SGX Launch Control LE hash MSRs Date: Mon, 18 Jan 2021 16:28:34 +1300 Message-Id: <5a8dbad4c5a7ba7b17ac4bf4239a50be7acc1805.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Emulate the four Launch Enclave public key hash MSRs (LE hash MSRs) that exist on CPUs that support SGX Launch Control (LC). SGX LC modifies the behavior of ENCLS[EINIT] to use the LE hash MSRs when verifying the key used to sign an enclave. On CPUs without LC support, the LE hash is hardwired into the CPU to an Intel controlled key (the Intel key is also the reset value of the LE hash MSRs). Track the guest's desired hash so that a future patch can stuff the hash into the hardware MSRs when executing EINIT on behalf of the guest, when those MSRs are writable in host. Note, KVM allows writes to the LE hash MSRs if IA32_FEATURE_CONTROL is unlocked. This is technically not architectural behavior, but it's roughly equivalent to the arch behavior of the MSRs being writable prior to activating SGX[1]. Emulating SGX activation is feasible, but adds no tangible benefits and would just create extra work for KVM and guest firmware. [1] SGX related bits in IA32_FEATURE_CONTROL cannot be set until SGX is activated, e.g. by firmware. SGX activation is triggered by setting bit 0 in MSR 0x7a. Until SGX is activated, the LE hash MSRs are writable, e.g. to allow firmware to lock down the LE root key with a non-Intel value. Signed-off-by: Sean Christopherson Co-developed-by: Kai Huang Signed-off-by: Kai Huang --- arch/x86/kvm/vmx/sgx.c | 35 +++++++++++++++++++++++++++++++++++ arch/x86/kvm/vmx/sgx.h | 6 ++++++ arch/x86/kvm/vmx/vmx.c | 20 ++++++++++++++++++++ arch/x86/kvm/vmx/vmx.h | 2 ++ 4 files changed, 63 insertions(+) diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 4281045318ac..6ad6a24c4e93 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -12,6 +12,9 @@ bool __read_mostly enable_sgx; +/* Initial value of guest's virtual SGX_LEPUBKEYHASHn MSRs */ +static u64 sgx_pubkey_hash[4] __ro_after_init; + /* * ENCLS's memory operands use a fixed segment (DS) and a fixed * address size based on the mode. Related prefixes are ignored. @@ -292,3 +295,35 @@ int handle_encls(struct kvm_vcpu *vcpu) } return 1; } + +void setup_default_sgx_lepubkeyhash(void) +{ + /* + * Use Intel's default value for Skylake hardware if Launch Control is + * not supported, i.e. Intel's hash is hardcoded into silicon, or if + * Launch Control is supported and enabled, i.e. mimic the reset value + * and let the guest write the MSRs at will. If Launch Control is + * supported but disabled, then use the current MSR values as the hash + * MSRs exist but are read-only (locked and not writable). + */ + if (!enable_sgx || !boot_cpu_has(X86_FEATURE_SGX_LC) || + rdmsrl_safe(MSR_IA32_SGXLEPUBKEYHASH0, &sgx_pubkey_hash[0])) { + sgx_pubkey_hash[0] = 0xa6053e051270b7acULL; + sgx_pubkey_hash[1] = 0x6cfbe8ba8b3b413dULL; + sgx_pubkey_hash[2] = 0xc4916d99f2b3735dULL; + sgx_pubkey_hash[3] = 0xd4f8c05909f9bb3bULL; + } else { + /* MSR_IA32_SGXLEPUBKEYHASH0 is read above */ + rdmsrl(MSR_IA32_SGXLEPUBKEYHASH1, sgx_pubkey_hash[1]); + rdmsrl(MSR_IA32_SGXLEPUBKEYHASH2, sgx_pubkey_hash[2]); + rdmsrl(MSR_IA32_SGXLEPUBKEYHASH3, sgx_pubkey_hash[3]); + } +} + +void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu) +{ + struct vcpu_vmx *vmx = to_vmx(vcpu); + + memcpy(vmx->msr_ia32_sgxlepubkeyhash, sgx_pubkey_hash, + sizeof(sgx_pubkey_hash)); +} diff --git a/arch/x86/kvm/vmx/sgx.h b/arch/x86/kvm/vmx/sgx.h index 647afc7546bf..05d774f62b7f 100644 --- a/arch/x86/kvm/vmx/sgx.h +++ b/arch/x86/kvm/vmx/sgx.h @@ -8,8 +8,14 @@ extern bool __read_mostly enable_sgx; int handle_encls(struct kvm_vcpu *vcpu); + +void setup_default_sgx_lepubkeyhash(void); +void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu); #else #define enable_sgx 0 + +static inline void setup_default_sgx_lepubkeyhash(void) { } +static inline void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu) { } #endif #endif /* __KVM_X86_SGX_H */ diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 149f472ac9df..a3372f6c557d 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1888,6 +1888,13 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_IA32_FEAT_CTL: msr_info->data = vmx->msr_ia32_feature_control; break; + case MSR_IA32_SGXLEPUBKEYHASH0 ... MSR_IA32_SGXLEPUBKEYHASH3: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_SGX_LC)) + return 1; + msr_info->data = to_vmx(vcpu)->msr_ia32_sgxlepubkeyhash + [msr_info->index - MSR_IA32_SGXLEPUBKEYHASH0]; + break; case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: if (!nested_vmx_allowed(vcpu)) return 1; @@ -2154,6 +2161,15 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) if (msr_info->host_initiated && data == 0) vmx_leave_nested(vcpu); break; + case MSR_IA32_SGXLEPUBKEYHASH0 ... MSR_IA32_SGXLEPUBKEYHASH3: + if (!msr_info->host_initiated && + (!guest_cpuid_has(vcpu, X86_FEATURE_SGX_LC) || + ((vmx->msr_ia32_feature_control & FEAT_CTL_LOCKED) && + !(vmx->msr_ia32_feature_control & FEAT_CTL_SGX_LC_ENABLED)))) + return 1; + vmx->msr_ia32_sgxlepubkeyhash + [msr_index - MSR_IA32_SGXLEPUBKEYHASH0] = data; + break; case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: if (!msr_info->host_initiated) return 1; /* they are read-only */ @@ -6957,6 +6973,8 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu) else memset(&vmx->nested.msrs, 0, sizeof(vmx->nested.msrs)); + vcpu_setup_sgx_lepubkeyhash(vcpu); + vmx->nested.posted_intr_nv = -1; vmx->nested.current_vmptr = -1ull; @@ -7907,6 +7925,8 @@ static __init int hardware_setup(void) if (!enable_ept || !cpu_has_vmx_intel_pt()) pt_mode = PT_MODE_SYSTEM; + setup_default_sgx_lepubkeyhash(); + if (nested) { nested_vmx_setup_ctls_msrs(&vmcs_config.nested, vmx_capability.ept); diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 903f246b5abd..af4bced6c84b 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -299,6 +299,8 @@ struct vcpu_vmx { */ u64 msr_ia32_feature_control; u64 msr_ia32_feature_control_valid_bits; + /* SGX Launch Control public key hash */ + u64 msr_ia32_sgxlepubkeyhash[4]; u64 ept_pointer; struct pt_desc pt_desc; From patchwork Mon Jan 18 03:28:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026407 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B565AC433DB for ; Mon, 18 Jan 2021 03:31:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F5BB224B1 for ; Mon, 18 Jan 2021 03:31:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731762AbhARDbR (ORCPT ); Sun, 17 Jan 2021 22:31:17 -0500 Received: from mga12.intel.com ([192.55.52.136]:16939 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731825AbhARDao (ORCPT ); Sun, 17 Jan 2021 22:30:44 -0500 IronPort-SDR: LeDrdNR/J4+zHRp+0a06QGEnB25qppCLuHWjhE1LutH0e0slpnrludtwohT1XfmXX/tnMDSwlJ fIWKsJkm+t9w== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933945" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933945" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:30 -0800 IronPort-SDR: NpK5Ax2XMwIFvm4brbc/3FvAXf7/cphxOjz2QYQ3vjYdeUVXZiy6cSwQCpfKLDdra63i83RrLv VQwcNUgtprvA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151198" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:25 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 24/26] KVM: VMX: Add ENCLS[EINIT] handler to support SGX Launch Control (LC) Date: Mon, 18 Jan 2021 16:28:35 +1300 Message-Id: <338e2bd11d557013ae407eaa4eee8a8d422d3011.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add a VM-Exit handler to trap-and-execute EINIT when SGX LC is enabled in the host. When SGX LC is enabled, the host kernel may rewrite the hardware values at will, e.g. to launch enclaves with different signers, thus KVM needs to intercept EINIT to ensure it is executed with the correct LE hash (even if the guest sees a hardwired hash). Switching the LE hash MSRs on VM-Enter/VM-Exit is not a viable option as writing the MSRs is prohibitively expensive, e.g. on SKL hardware each WRMSR is ~400 cycles. And because EINIT takes tens of thousands of cycles to execute, the ~1500 cycle overhead to trap-and-execute EINIT is unlikely to be noticed by the guest, let alone impact its overall SGX performance. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- arch/x86/kvm/vmx/sgx.c | 55 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 6ad6a24c4e93..979d0597e4ac 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -256,6 +256,59 @@ static int handle_encls_ecreate(struct kvm_vcpu *vcpu) return kvm_skip_emulated_instruction(vcpu); } +static int handle_encls_einit(struct kvm_vcpu *vcpu) +{ + unsigned long sig_hva, secs_hva, token_hva, rflags; + struct vcpu_vmx *vmx = to_vmx(vcpu); + gva_t sig_gva, secs_gva, token_gva; + gpa_t sig_gpa, secs_gpa, token_gpa; + int ret, trapnr; + + if (sgx_get_encls_gva(vcpu, kvm_rbx_read(vcpu), 1808, 4096, &sig_gva) || + sgx_get_encls_gva(vcpu, kvm_rcx_read(vcpu), 4096, 4096, &secs_gva) || + sgx_get_encls_gva(vcpu, kvm_rdx_read(vcpu), 304, 512, &token_gva)) + return 1; + + /* + * Translate the SIGSTRUCT, SECS and TOKEN pointers from GVA to GPA. + * Resume the guest on failure to inject a #PF. + */ + if (sgx_gva_to_gpa(vcpu, sig_gva, false, &sig_gpa) || + sgx_gva_to_gpa(vcpu, secs_gva, true, &secs_gpa) || + sgx_gva_to_gpa(vcpu, token_gva, false, &token_gpa)) + return 1; + + /* + * ...and then to HVA. The order of accesses isn't architectural, i.e. + * KVM doesn't have to fully process one address at a time. Exit to + * userspace if a GPA is invalid. Note, all structures are aligned and + * cannot split pages. + */ + if (sgx_gpa_to_hva(vcpu, sig_gpa, &sig_hva) || + sgx_gpa_to_hva(vcpu, secs_gpa, &secs_hva) || + sgx_gpa_to_hva(vcpu, token_gpa, &token_hva)) + return 0; + + ret = sgx_virt_einit((void __user *)sig_hva, (void __user *)token_hva, + (void __user *)secs_hva, + vmx->msr_ia32_sgxlepubkeyhash, &trapnr); + + if (ret == -EFAULT) + return sgx_inject_fault(vcpu, secs_gva, trapnr); + + rflags = vmx_get_rflags(vcpu) & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | + X86_EFLAGS_AF | X86_EFLAGS_SF | + X86_EFLAGS_OF); + if (ret) + rflags |= X86_EFLAGS_ZF; + else + rflags &= ~X86_EFLAGS_ZF; + vmx_set_rflags(vcpu, rflags); + + kvm_rax_write(vcpu, ret); + return kvm_skip_emulated_instruction(vcpu); +} + static inline bool encls_leaf_enabled_in_guest(struct kvm_vcpu *vcpu, u32 leaf) { if (!enable_sgx || !guest_cpuid_has(vcpu, X86_FEATURE_SGX)) @@ -288,6 +341,8 @@ int handle_encls(struct kvm_vcpu *vcpu) } else { if (leaf == ECREATE) return handle_encls_ecreate(vcpu); + if (leaf == EINIT) + return handle_encls_einit(vcpu); WARN(1, "KVM: unexpected exit on ENCLS[%u]", leaf); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_ENCLS; From patchwork Mon Jan 18 03:28:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026409 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2472C433DB for ; Mon, 18 Jan 2021 03:31:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A072E224B1 for ; Mon, 18 Jan 2021 03:31:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731798AbhARDb2 (ORCPT ); Sun, 17 Jan 2021 22:31:28 -0500 Received: from mga12.intel.com ([192.55.52.136]:16942 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731860AbhARDaw (ORCPT ); Sun, 17 Jan 2021 22:30:52 -0500 IronPort-SDR: 4fD5SejSbIqayUl4ffilhEvwjl8VwJvDuR6yW7QXImS9hOsPxCR4n0lxwN+kYtH9ngFw/Q26NB m2hnqkET9RFg== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="157933951" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="157933951" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:34 -0800 IronPort-SDR: BkLnCfXXNWQ2WpNP1e62mQfqn4atPAs75zspH/N9qBc+/mbf03uCIj+6DAFV87Vw2uAB0xxM6i vBgnDZ9LB4DQ== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151225" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:30 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, Kai Huang Subject: [RFC PATCH v2 25/26] KVM: VMX: Enable SGX virtualization for SGX1, SGX2 and LC Date: Mon, 18 Jan 2021 16:28:36 +1300 Message-Id: <4c0b15f2f43dd39ba768374d295bdd0e5d5c84c6.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Enable SGX virtualization now that KVM has the VM-Exit handlers needed to trap-and-execute ENCLS to ensure correctness and/or enforce the CPU model exposed to the guest. Add a KVM module param, "sgx", to allow an admin to disable SGX virtualization independent of the kernel. When supported in hardware and the kernel, advertise SGX1, SGX2 and SGX LC to userspace via CPUID and wire up the ENCLS_EXITING bitmap based on the guest's SGX capabilities, i.e. to allow ENCLS to be executed in an SGX-enabled guest. With the exception of the provision key, all SGX attribute bits may be exposed to the guest. Guest access to the provision key, which is controlled via securityfs, will be added in a future patch. Note, KVM does not yet support exposing ENCLS_C leafs or ENCLV leafs. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- v1->v2: - Changed to use kvm_cpu_cap_init() instead of kvm_cpu_cap_mask() to expose SGX1 and SGX2 due to they are scattered in X86_FEATURE_SGX1/SGX2. --- arch/x86/kvm/cpuid.c | 57 +++++++++++++++++++++++++++- arch/x86/kvm/vmx/nested.c | 26 +++++++++++-- arch/x86/kvm/vmx/nested.h | 5 +++ arch/x86/kvm/vmx/sgx.c | 80 ++++++++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx/sgx.h | 13 +++++++ arch/x86/kvm/vmx/vmcs12.c | 1 + arch/x86/kvm/vmx/vmcs12.h | 4 +- arch/x86/kvm/vmx/vmx.c | 38 ++++++++++++++++++- 8 files changed, 215 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index f8037fab8950..04b2f5de2d7b 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "cpuid.h" #include "lapic.h" #include "mmu.h" @@ -171,6 +172,21 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vcpu->arch.guest_supported_xcr0 = (best->eax | ((u64)best->edx << 32)) & supported_xcr0; + /* + * Bits 127:0 of the allowed SECS.ATTRIBUTES (CPUID.0x12.0x1) enumerate + * the supported XSAVE Feature Request Mask (XFRM), i.e. the enclave's + * requested XCR0 value. The enclave's XFRM must be a subset of XCRO + * at the time of EENTER, thus adjust the allowed XFRM by the guest's + * supported XCR0. Similar to XCR0 handling, FP and SSE are forced to + * '1' even on CPUs that don't support XSAVE. + */ + best = kvm_find_cpuid_entry(vcpu, 0x12, 0x1); + if (best) { + best->ecx &= vcpu->arch.guest_supported_xcr0 & 0xffffffff; + best->edx &= vcpu->arch.guest_supported_xcr0 >> 32; + best->ecx |= XFEATURE_MASK_FPSSE; + } + kvm_update_pv_runtime(vcpu); vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); @@ -413,7 +429,7 @@ void kvm_set_cpu_caps(void) ); kvm_cpu_cap_mask(CPUID_7_0_EBX, - F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | + F(FSGSBASE) | F(SGX) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | F(BMI2) | F(ERMS) | 0 /*INVPCID*/ | F(RTM) | 0 /*MPX*/ | F(RDSEED) | F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) | @@ -424,7 +440,8 @@ void kvm_set_cpu_caps(void) F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ | F(RDPID) | F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) | F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) | - F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B) | 0 /*WAITPKG*/ + F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B) | 0 /*WAITPKG*/ | + F(SGX_LC) ); /* Set LA57 based on hardware capability. */ if (cpuid_ecx(7) & F(LA57)) @@ -463,6 +480,10 @@ void kvm_set_cpu_caps(void) F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) ); + kvm_cpu_cap_init(CPUID_12_EAX, + SF(SGX1) | SF(SGX2) + ); + kvm_cpu_cap_mask(CPUID_8000_0001_ECX, F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | @@ -784,6 +805,38 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) entry->edx = 0; } break; + case 0x12: + /* Intel SGX */ + if (!kvm_cpu_cap_has(X86_FEATURE_SGX)) { + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; + break; + } + + /* + * Index 0: Sub-features, MISCSELECT (a.k.a extended features) + * and max enclave sizes. The SGX sub-features and MISCSELECT + * are restricted by kernel and KVM capabilities (like most + * feature flags), while enclave size is unrestricted. + */ + cpuid_entry_override(entry, CPUID_12_EAX); + entry->ebx &= SGX_MISC_EXINFO; + + entry = do_host_cpuid(array, function, 1); + if (!entry) + goto out; + + /* + * Index 1: SECS.ATTRIBUTES. ATTRIBUTES are restricted a la + * feature flags. Advertise all supported flags, including + * privileged attributes that require explicit opt-in from + * userspace. ATTRIBUTES.XFRM is not adjusted as userspace is + * expected to derive it from supported XCR0. + */ + entry->eax &= SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | + /* PROVISIONKEY | */ SGX_ATTR_EINITTOKENKEY | + SGX_ATTR_KSS; + entry->ebx &= 0; + break; /* Intel PT */ case 0x14: if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) { diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 562eab7b0a51..fca1f4c8cc5b 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -11,6 +11,7 @@ #include "mmu.h" #include "nested.h" #include "pmu.h" +#include "sgx.h" #include "trace.h" #include "x86.h" @@ -2318,6 +2319,9 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST)) exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; + if (exec_control & SECONDARY_EXEC_ENCLS_EXITING) + vmx_write_encls_bitmap(&vmx->vcpu, vmcs12); + secondary_exec_controls_set(vmx, exec_control); } @@ -5726,6 +5730,20 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, return false; } +static bool nested_vmx_exit_handled_encls(struct kvm_vcpu *vcpu, + struct vmcs12 *vmcs12) +{ + u32 encls_leaf; + + if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENCLS_EXITING)) + return false; + + encls_leaf = kvm_rax_read(vcpu); + if (encls_leaf > 62) + encls_leaf = 63; + return vmcs12->encls_exiting_bitmap & BIT_ULL(encls_leaf); +} + static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, gpa_t bitmap) { @@ -5819,9 +5837,6 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, case EXIT_REASON_VMFUNC: /* VM functions are emulated through L2->L0 vmexits. */ return true; - case EXIT_REASON_ENCLS: - /* SGX is never exposed to L1 */ - return true; default: break; } @@ -5945,6 +5960,8 @@ static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu, case EXIT_REASON_TPAUSE: return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE); + case EXIT_REASON_ENCLS: + return nested_vmx_exit_handled_encls(vcpu, vmcs12); default: return true; } @@ -6517,6 +6534,9 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps) msrs->secondary_ctls_high |= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; + if (enable_sgx) + msrs->secondary_ctls_high |= SECONDARY_EXEC_ENCLS_EXITING; + /* miscellaneous data */ rdmsr(MSR_IA32_VMX_MISC, msrs->misc_low, diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h index 197148d76b8f..184418baeb3c 100644 --- a/arch/x86/kvm/vmx/nested.h +++ b/arch/x86/kvm/vmx/nested.h @@ -244,6 +244,11 @@ static inline bool nested_exit_on_intr(struct kvm_vcpu *vcpu) PIN_BASED_EXT_INTR_MASK; } +static inline bool nested_cpu_has_encls_exit(struct vmcs12 *vmcs12) +{ + return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENCLS_EXITING); +} + /* * if fixed0[i] == 1: val[i] must be 1 * if fixed1[i] == 0: val[i] must be 0 diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 979d0597e4ac..62c3f3ec960b 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -6,11 +6,13 @@ #include "cpuid.h" #include "kvm_cache_regs.h" +#include "nested.h" #include "sgx.h" #include "vmx.h" #include "x86.h" -bool __read_mostly enable_sgx; +bool __read_mostly enable_sgx = 1; +module_param_named(sgx, enable_sgx, bool, 0444); /* Initial value of guest's virtual SGX_LEPUBKEYHASHn MSRs */ static u64 sgx_pubkey_hash[4] __ro_after_init; @@ -382,3 +384,79 @@ void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu) memcpy(vmx->msr_ia32_sgxlepubkeyhash, sgx_pubkey_hash, sizeof(sgx_pubkey_hash)); } + +/* + * ECREATE must be intercepted to enforce MISCSELECT, ATTRIBUTES and XFRM + * restrictions if the guest's allowed-1 settings diverge from hardware. + */ +static bool sgx_intercept_encls_ecreate(struct kvm_vcpu *vcpu) +{ + struct kvm_cpuid_entry2 *guest_cpuid; + u32 eax, ebx, ecx, edx; + + if (!vcpu->kvm->arch.sgx_provisioning_allowed) + return true; + + guest_cpuid = kvm_find_cpuid_entry(vcpu, 0x12, 0); + if (!guest_cpuid) + return true; + + cpuid_count(0x12, 0, &eax, &ebx, &ecx, &edx); + if (guest_cpuid->ebx != ebx || guest_cpuid->edx != edx) + return true; + + guest_cpuid = kvm_find_cpuid_entry(vcpu, 0x12, 1); + if (!guest_cpuid) + return true; + + cpuid_count(0x12, 1, &eax, &ebx, &ecx, &edx); + if (guest_cpuid->eax != eax || guest_cpuid->ebx != ebx || + guest_cpuid->ecx != ecx || guest_cpuid->edx != edx) + return true; + + return false; +} + +void vmx_write_encls_bitmap(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) +{ + /* + * There is no software enable bit for SGX that is virtualized by + * hardware, e.g. there's no CR4.SGXE, so when SGX is disabled in the + * guest (either by the host or by the guest's BIOS) but enabled in the + * host, trap all ENCLS leafs and inject #UD/#GP as needed to emulate + * the expected system behavior for ENCLS. + */ + u64 bitmap = -1ull; + + /* Nothing to do if hardware doesn't support SGX */ + if (!cpu_has_vmx_encls_vmexit()) + return; + + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX) && + sgx_enabled_in_guest_bios(vcpu)) { + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX1)) { + bitmap &= ~GENMASK_ULL(ETRACK, ECREATE); + if (sgx_intercept_encls_ecreate(vcpu)) + bitmap |= (1 << ECREATE); + } + + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX2)) + bitmap &= ~GENMASK_ULL(EMODT, EAUG); + + /* + * Trap and execute EINIT if launch control is enabled in the + * host using the guest's values for launch control MSRs, even + * if the guest's values are fixed to hardware default values. + * The MSRs are not loaded/saved on VM-Enter/VM-Exit as writing + * the MSRs is extraordinarily expensive. + */ + if (boot_cpu_has(X86_FEATURE_SGX_LC)) + bitmap |= (1 << EINIT); + + if (!vmcs12 && is_guest_mode(vcpu)) + vmcs12 = get_vmcs12(vcpu); + if (vmcs12 && nested_cpu_has_encls_exit(vmcs12)) + bitmap |= vmcs12->encls_exiting_bitmap; + } + vmcs_write64(ENCLS_EXITING_BITMAP, bitmap); +} diff --git a/arch/x86/kvm/vmx/sgx.h b/arch/x86/kvm/vmx/sgx.h index 05d774f62b7f..da570dc8e519 100644 --- a/arch/x86/kvm/vmx/sgx.h +++ b/arch/x86/kvm/vmx/sgx.h @@ -4,6 +4,9 @@ #include +#include "capabilities.h" +#include "vmx_ops.h" + #ifdef CONFIG_X86_SGX_VIRTUALIZATION extern bool __read_mostly enable_sgx; @@ -11,11 +14,21 @@ int handle_encls(struct kvm_vcpu *vcpu); void setup_default_sgx_lepubkeyhash(void); void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu); + +void vmx_write_encls_bitmap(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12); #else #define enable_sgx 0 static inline void setup_default_sgx_lepubkeyhash(void) { } static inline void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu) { } + +static inline void vmx_write_encls_bitmap(struct kvm_vcpu *vcpu, + struct vmcs12 *vmcs12) +{ + /* Nothing to do if hardware doesn't support SGX */ + if (cpu_has_vmx_encls_vmexit()) + vmcs_write64(ENCLS_EXITING_BITMAP, -1ull); +} #endif #endif /* __KVM_X86_SGX_H */ diff --git a/arch/x86/kvm/vmx/vmcs12.c b/arch/x86/kvm/vmx/vmcs12.c index c8e51c004f78..034adb6404dc 100644 --- a/arch/x86/kvm/vmx/vmcs12.c +++ b/arch/x86/kvm/vmx/vmcs12.c @@ -50,6 +50,7 @@ const unsigned short vmcs_field_to_offset_table[] = { FIELD64(VMREAD_BITMAP, vmread_bitmap), FIELD64(VMWRITE_BITMAP, vmwrite_bitmap), FIELD64(XSS_EXIT_BITMAP, xss_exit_bitmap), + FIELD64(ENCLS_EXITING_BITMAP, encls_exiting_bitmap), FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address), FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer), FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl), diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h index 80232daf00ff..13494956d0e9 100644 --- a/arch/x86/kvm/vmx/vmcs12.h +++ b/arch/x86/kvm/vmx/vmcs12.h @@ -69,7 +69,8 @@ struct __packed vmcs12 { u64 vm_function_control; u64 eptp_list_address; u64 pml_address; - u64 padding64[3]; /* room for future expansion */ + u64 encls_exiting_bitmap; + u64 padding64[2]; /* room for future expansion */ /* * To allow migration of L1 (complete with its L2 guests) between * machines of different natural widths (32 or 64 bit), we cannot have @@ -256,6 +257,7 @@ static inline void vmx_check_vmcs12_offsets(void) CHECK_OFFSET(vm_function_control, 296); CHECK_OFFSET(eptp_list_address, 304); CHECK_OFFSET(pml_address, 312); + CHECK_OFFSET(encls_exiting_bitmap, 320); CHECK_OFFSET(cr0_guest_host_mask, 344); CHECK_OFFSET(cr4_guest_host_mask, 352); CHECK_OFFSET(cr0_read_shadow, 360); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index a3372f6c557d..2b096d6ff896 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2160,6 +2160,9 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) vmx->msr_ia32_feature_control = data; if (msr_info->host_initiated && data == 0) vmx_leave_nested(vcpu); + + /* SGX may be enabled/disabled by guest's firmware */ + vmx_write_encls_bitmap(vcpu, NULL); break; case MSR_IA32_SGXLEPUBKEYHASH0 ... MSR_IA32_SGXLEPUBKEYHASH3: if (!msr_info->host_initiated && @@ -4317,6 +4320,15 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx) vmx_adjust_sec_exec_control(vmx, &exec_control, waitpkg, WAITPKG, ENABLE_USR_WAIT_PAUSE, false); + if (cpu_has_vmx_encls_vmexit() && nested) { + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX)) + vmx->nested.msrs.secondary_ctls_high |= + SECONDARY_EXEC_ENCLS_EXITING; + else + vmx->nested.msrs.secondary_ctls_high &= + ~SECONDARY_EXEC_ENCLS_EXITING; + } + vmx->secondary_exec_control = exec_control; } @@ -4416,8 +4428,7 @@ static void init_vmcs(struct vcpu_vmx *vmx) vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); } - if (cpu_has_vmx_encls_vmexit()) - vmcs_write64(ENCLS_EXITING_BITMAP, -1ull); + vmx_write_encls_bitmap(&vmx->vcpu, NULL); if (vmx_pt_mode_is_host_guest()) { memset(&vmx->pt_desc, 0, sizeof(vmx->pt_desc)); @@ -7301,6 +7312,22 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) set_cr4_guest_host_mask(vmx); + vmx_write_encls_bitmap(vcpu, NULL); + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX)) + vmx->msr_ia32_feature_control_valid_bits |= FEAT_CTL_SGX_ENABLED; + else + vmx->msr_ia32_feature_control_valid_bits &= ~FEAT_CTL_SGX_ENABLED; + /* + * Only allow guest to write its virtual SGX_LEPUBKEYHASHn MSRs when + * host is writable, otherwise it is meaningless. + */ + if (guest_cpuid_has(vcpu, X86_FEATURE_SGX_LC)) + vmx->msr_ia32_feature_control_valid_bits |= + FEAT_CTL_SGX_LC_ENABLED; + else + vmx->msr_ia32_feature_control_valid_bits &= + ~FEAT_CTL_SGX_LC_ENABLED; + /* Refresh #PF interception to account for MAXPHYADDR changes. */ update_exception_bitmap(vcpu); } @@ -7321,6 +7348,13 @@ static __init void vmx_set_cpu_caps(void) if (vmx_pt_mode_is_host_guest()) kvm_cpu_cap_check_and_set(X86_FEATURE_INTEL_PT); + if (!enable_sgx) { + kvm_cpu_cap_clear(X86_FEATURE_SGX); + kvm_cpu_cap_clear(X86_FEATURE_SGX_LC); + kvm_cpu_cap_clear(X86_FEATURE_SGX1); + kvm_cpu_cap_clear(X86_FEATURE_SGX2); + } + if (vmx_umip_emulated()) kvm_cpu_cap_set(X86_FEATURE_UMIP); From patchwork Mon Jan 18 03:29:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12026405 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5FA25C433E0 for ; Mon, 18 Jan 2021 03:31:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C732224B1 for ; Mon, 18 Jan 2021 03:31:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729804AbhARDbL (ORCPT ); Sun, 17 Jan 2021 22:31:11 -0500 Received: from mga06.intel.com ([134.134.136.31]:32175 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731684AbhARDaj (ORCPT ); Sun, 17 Jan 2021 22:30:39 -0500 IronPort-SDR: 0ztt5x5C0VYbzcyKfv9xgFSL9eav7U6nxjxExjf30BMgFEPJ0ae/vbud48RY3DGVFBXEnef9hg Y6QgyaPX9VsQ== X-IronPort-AV: E=McAfee;i="6000,8403,9867"; a="240296018" X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="240296018" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:46 -0800 IronPort-SDR: eZDC2/tBbSV1eEWujzwEu2OaQ2Mbu6RQekVjsjCrWDm9qzu5tTTqC3TCwM1ZmEfN/kyB1skkuO yV8kNrbnvlEA== X-IronPort-AV: E=Sophos;i="5.79,355,1602572400"; d="scan'208";a="573151251" Received: from amrahman-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.142.253]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2021 19:29:42 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, vkuznets@redhat.com, wanpengli@tencent.com, corbet@lwn.net, Andy Lutomirski , Kai Huang Subject: [RFC PATCH v2 26/26] KVM: x86: Add capability to grant VM access to privileged SGX attribute Date: Mon, 18 Jan 2021 16:29:35 +1300 Message-Id: <94ac3c0bfbb5b7fe59a3cf3a30699c2f6dce8869.1610935432.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Sean Christopherson Add a capability, KVM_CAP_SGX_ATTRIBUTE, that can be used by userspace to grant a VM access to a priveleged attribute, with args[0] holding a file handle to a valid SGX attribute file. The SGX subsystem restricts access to a subset of enclave attributes to provide additional security for an uncompromised kernel, e.g. to prevent malware from using the PROVISIONKEY to ensure its nodes are running inside a geniune SGX enclave and/or to obtain a stable fingerprint. To prevent userspace from circumventing such restrictions by running an enclave in a VM, KVM restricts guest access to privileged attributes by default. Cc: Andy Lutomirski Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang --- Documentation/virt/kvm/api.rst | 23 +++++++++++++++++++++++ arch/x86/kvm/cpuid.c | 2 +- arch/x86/kvm/x86.c | 22 ++++++++++++++++++++++ include/uapi/linux/kvm.h | 1 + 4 files changed, 47 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index c136e254b496..47c7c7c33025 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -6037,6 +6037,29 @@ KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications which user space can then handle to implement model specific MSR handling and/or user notifications to inform a user that an MSR was not handled. +7.22 KVM_CAP_SGX_ATTRIBUTE +---------------------- + +:Architectures: x86 +:Target: VM +:Parameters: args[0] is a file handle of a SGX attribute file in securityfs +:Returns: 0 on success, -EINVAL if the file handle is invalid or if a requested + attribute is not supported by KVM. + +KVM_CAP_SGX_ATTRIBUTE enables a userspace VMM to grant a VM access to one or +more priveleged enclave attributes. args[0] must hold a file handle to a valid +SGX attribute file corresponding to an attribute that is supported/restricted +by KVM (currently only PROVISIONKEY). + +The SGX subsystem restricts access to a subset of enclave attributes to provide +additional security for an uncompromised kernel, e.g. use of the PROVISIONKEY +is restricted to deter malware from using the PROVISIONKEY to obtain a stable +system fingerprint. To prevent userspace from circumventing such restrictions +by running an enclave in a VM, KVM prevents access to privileged attributes by +default. + +See Documentation/x86/sgx/2.Kernel-internals.rst for more details. + 8. Other capabilities. ====================== diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 04b2f5de2d7b..ad00a1af1545 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -833,7 +833,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) * expected to derive it from supported XCR0. */ entry->eax &= SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | - /* PROVISIONKEY | */ SGX_ATTR_EINITTOKENKEY | + SGX_ATTR_PROVISIONKEY | SGX_ATTR_EINITTOKENKEY | SGX_ATTR_KSS; entry->ebx &= 0; break; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5ca7b181a3ae..b4409b0edecc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -74,6 +74,8 @@ #include #include #include +#include +#include #include #define CREATE_TRACE_POINTS @@ -3767,6 +3769,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_X86_USER_SPACE_MSR: case KVM_CAP_X86_MSR_FILTER: case KVM_CAP_ENFORCE_PV_FEATURE_CPUID: +#ifdef CONFIG_X86_SGX_VIRTUALIZATION + case KVM_CAP_SGX_ATTRIBUTE: +#endif r = 1; break; case KVM_CAP_SYNC_REGS: @@ -5295,6 +5300,23 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, kvm->arch.user_space_msr_mask = cap->args[0]; r = 0; break; +#ifdef CONFIG_X86_SGX_VIRTUALIZATION + case KVM_CAP_SGX_ATTRIBUTE: { + unsigned long allowed_attributes = 0; + + r = sgx_set_attribute(&allowed_attributes, cap->args[0]); + if (r) + break; + + /* KVM only supports the PROVISIONKEY privileged attribute. */ + if ((allowed_attributes & SGX_ATTR_PROVISIONKEY) && + !(allowed_attributes & ~SGX_ATTR_PROVISIONKEY)) + kvm->arch.sgx_provisioning_allowed = true; + else + r = -EINVAL; + break; + } +#endif default: r = -EINVAL; break; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 374c67875cdb..e17bda18a9b4 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1058,6 +1058,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_ENFORCE_PV_FEATURE_CPUID 190 #define KVM_CAP_SYS_HYPERV_CPUID 191 #define KVM_CAP_DIRTY_LOG_RING 192 +#define KVM_CAP_SGX_ATTRIBUTE 200 #ifdef KVM_CAP_IRQ_ROUTING