From patchwork Tue Jul 20 04:55:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12387539 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 CED42C07E95 for ; Tue, 20 Jul 2021 04:56:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B7268610D0 for ; Tue, 20 Jul 2021 04:56:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241562AbhGTEPX (ORCPT ); Tue, 20 Jul 2021 00:15:23 -0400 Received: from mga14.intel.com ([192.55.52.115]:51770 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237680AbhGTEPR (ORCPT ); Tue, 20 Jul 2021 00:15:17 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10050"; a="210897305" X-IronPort-AV: E=Sophos;i="5.84,254,1620716400"; d="scan'208";a="210897305" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2021 21:55:56 -0700 X-IronPort-AV: E=Sophos;i="5.84,254,1620716400"; d="scan'208";a="431923344" Received: from ywei11-mobl1.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.251.138.31]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2021 21:55:55 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Hans de Goede , Mark Gross , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko 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, platform-driver-x86@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v3 2/6] x86/tdx: Add GetQuote TDX hypercall support Date: Mon, 19 Jul 2021 21:55:48 -0700 Message-Id: <20210720045552.2124688-3-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210720045552.2124688-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210720045552.2124688-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org The second stage in the attestation process is for the guest to request the VMM generate and sign a quote based on the TDREPORT acquired earlier. Add tdx_hcall_get_quote() helper function to implement the GetQuote hypercall. More details about the GetQuote TDVMCALL are in the Guest-Host Communication Interface (GHCI) Specification, sec 3.3, titled "TDG.VP.VMCALL". This will be used by the TD attestation driver in follow-on patches. Reviewed-by: Tony Luck Reviewed-by: Andi Kleen Signed-off-by: Kuppuswamy Sathyanarayanan --- Change since v2: * Included TDVMCALL_SUCCESS case check in tdx_hcall_get_quote(). arch/x86/include/asm/tdx.h | 2 ++ arch/x86/kernel/tdx.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index 4f1b5c14a09b..1599aa4850e5 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -98,6 +98,8 @@ bool tdg_filter_enabled(void); int tdx_mcall_tdreport(u64 data, u64 reportdata); +int tdx_hcall_get_quote(u64 data); + /* * To support I/O port access in decompressor or early kernel init * code, since #VE exception handler cannot be used, use paravirt diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c index f9a28b4e6d3e..aa49c6809a0c 100644 --- a/arch/x86/kernel/tdx.c +++ b/arch/x86/kernel/tdx.c @@ -28,6 +28,7 @@ /* TDX hypercall Leaf IDs */ #define TDVMCALL_MAP_GPA 0x10001 +#define TDVMCALL_GET_QUOTE 0x10002 /* TDX Module call error codes */ #define TDX_PAGE_ALREADY_ACCEPTED 0x8000000000000001 @@ -37,6 +38,10 @@ #define TDCALL_SUCCESS 0x0 #define TDCALL_RETURN_CODE(a) ((a) & TDCALL_RETURN_CODE_MASK) +/* TDX hypercall error codes */ +#define TDVMCALL_SUCCESS 0x0 +#define TDVMCALL_INVALID_OPERAND 0x8000000000000000 +#define TDVMCALL_TDREPORT_FAILED 0x8000000000000001 #define VE_IS_IO_OUT(exit_qual) (((exit_qual) & 8) ? 0 : 1) #define VE_GET_IO_SIZE(exit_qual) (((exit_qual) & 7) + 1) @@ -175,6 +180,34 @@ int tdx_mcall_tdreport(u64 data, u64 reportdata) } EXPORT_SYMBOL_GPL(tdx_mcall_tdreport); +/* + * tdx_hcall_get_quote() - Generate TDQUOTE using TDREPORT_STRUCT. + * + * @data : Physical address of 4KB GPA memory which contains + * TDREPORT_STRUCT. + * + * return 0 on success or failure error number. + */ +int tdx_hcall_get_quote(u64 data) +{ + u64 ret; + + if (!data || !prot_guest_has(PR_GUEST_TDX)) + return -EINVAL; + + ret = _trace_tdx_hypercall(TDVMCALL_GET_QUOTE, data, 0, 0, 0, NULL); + + if (ret == TDVMCALL_SUCCESS) + return 0; + else if (ret == TDVMCALL_INVALID_OPERAND) + return -EINVAL; + else if (ret == TDVMCALL_TDREPORT_FAILED) + return -EBUSY; + + return -EIO; +} +EXPORT_SYMBOL_GPL(tdx_hcall_get_quote); + static void tdg_get_info(void) { u64 ret;