From patchwork Thu Aug 5 00:52:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12419995 X-Patchwork-Delegate: bhelgaas@google.com 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=-16.8 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 04201C19F3B for ; Thu, 5 Aug 2021 00:53:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E1F64610A8 for ; Thu, 5 Aug 2021 00:53:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237144AbhHEAyH (ORCPT ); Wed, 4 Aug 2021 20:54:07 -0400 Received: from mga02.intel.com ([134.134.136.20]:12129 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236596AbhHEAxn (ORCPT ); Wed, 4 Aug 2021 20:53:43 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10066"; a="201215429" X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="201215429" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:29 -0700 X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="437617203" Received: from mjkendri-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.254.17.117]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:27 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Bjorn Helgaas , Richard Henderson , Thomas Bogendoerfer , James E J Bottomley , Helge Deller , "David S . Miller" , Arnd Bergmann , Jonathan Corbet , "Michael S . Tsirkin" Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v4 04/15] x86/tdx: Add helper to do MapGPA hypercall Date: Wed, 4 Aug 2021 17:52:07 -0700 Message-Id: <20210805005218.2912076-5-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: "Kirill A. Shutemov" MapGPA hypercall is used by TDX guests to request VMM convert the existing mapping of given GPA address range between private/shared. tdx_hcall_gpa_intent() is the wrapper used for making MapGPA hypercall. Signed-off-by: Kirill A. Shutemov Reviewed-by: Andi Kleen Reviewed-by: Tony Luck Signed-off-by: Kuppuswamy Sathyanarayanan --- Changes since v3: * None Changes since v1: * Modified tdx_hcall_gpa_intent() to use _tdx_hypercall() instead of tdx_hypercall(). arch/x86/include/asm/tdx.h | 18 ++++++++++++++++++ arch/x86/kernel/tdx.c | 25 +++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index 1e2a1c6a1898..665c8cf57d5b 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -56,6 +56,15 @@ struct ve_info { u32 instr_info; }; +/* + * Page mapping type enum. This is software construct not + * part of any hardware or VMM ABI. + */ +enum tdx_map_type { + TDX_MAP_PRIVATE, + TDX_MAP_SHARED, +}; + #ifdef CONFIG_INTEL_TDX_GUEST void __init tdx_early_init(void); @@ -79,6 +88,9 @@ bool tdg_early_handle_ve(struct pt_regs *regs); extern phys_addr_t tdg_shared_mask(void); +extern int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages, + enum tdx_map_type map_type); + /* * To support I/O port access in decompressor or early kernel init * code, since #VE exception handler cannot be used, use paravirt @@ -149,6 +161,12 @@ static inline bool tdg_early_handle_ve(struct pt_regs *regs) { return false; } static inline phys_addr_t tdg_shared_mask(void) { return 0; } +static inline int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages, + enum tdx_map_type map_type) +{ + return -ENODEV; +} + #endif /* CONFIG_INTEL_TDX_GUEST */ #ifdef CONFIG_INTEL_TDX_GUEST_KVM diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c index d316fe33f52f..ccbad600a422 100644 --- a/arch/x86/kernel/tdx.c +++ b/arch/x86/kernel/tdx.c @@ -18,6 +18,9 @@ #define TDINFO 1 #define TDGETVEINFO 3 +/* TDX hypercall Leaf IDs */ +#define TDVMCALL_MAP_GPA 0x10001 + #define VE_IS_IO_OUT(exit_qual) (((exit_qual) & 8) ? 0 : 1) #define VE_GET_IO_SIZE(exit_qual) (((exit_qual) & 7) + 1) #define VE_GET_PORT_NUM(exit_qual) ((exit_qual) >> 16) @@ -97,6 +100,28 @@ static void tdg_get_info(void) physical_mask &= ~tdg_shared_mask(); } +/* + * Inform the VMM of the guest's intent for this physical page: + * shared with the VMM or private to the guest. The VMM is + * expected to change its mapping of the page in response. + * + * Note: shared->private conversions require further guest + * action to accept the page. + */ +int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages, + enum tdx_map_type map_type) +{ + u64 ret; + + if (map_type == TDX_MAP_SHARED) + gpa |= tdg_shared_mask(); + + ret = _tdx_hypercall(TDVMCALL_MAP_GPA, gpa, PAGE_SIZE * numpages, 0, 0, + NULL); + + return ret ? -EIO : 0; +} + static __cpuidle void tdg_halt(void) { u64 ret;