From patchwork Tue Feb 22 23:17:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12756043 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CC4FC4167E for ; Tue, 22 Feb 2022 23:18:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233405AbiBVXS2 (ORCPT ); Tue, 22 Feb 2022 18:18:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235489AbiBVXS0 (ORCPT ); Tue, 22 Feb 2022 18:18:26 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE7BD90FF6; Tue, 22 Feb 2022 15:18:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645571880; x=1677107880; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7grz1QJ3374vaI95vOpZhd1dAyuBLzPtAYC2SN7sRog=; b=DEP+WJqzdLp+Bdb243fFe37UnNCS0vSeeMHiWoH7e8cjTYN72IbCXM8K YIGyvfc3rlMGjEzjRufS3prpI8pfpR3+M/EZwP6QL56gJkf4Oss0ntS4i SvRgRIx9GrLhxGq8K22q8WWkW4/456lG1HrefH8iniP5p81ILICSyYoJq 3vWn7sPxi0y+/OkNrQPGd74kteBYKrGic7gsUHLdkjbTqG45zK2Etk3My Y2fD4dbqFOFwPOkLNT9OIbvLgjvfl1dMiurvpxwziBWutc5T5bYd2KmJN OdjcDUmsTCxx9k/Kjx6gnHgbkIy3iDqC8+YGVoHQeym5WDJ5XWuoHIPVE Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10266"; a="231810094" X-IronPort-AV: E=Sophos;i="5.88,389,1635231600"; d="scan'208";a="231810094" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 15:18:00 -0800 X-IronPort-AV: E=Sophos;i="5.88,389,1635231600"; d="scan'208";a="776476633" Received: from skoppolu-mobl4.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.252.138.103]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 15:17:59 -0800 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Hans de Goede , Mark Gross , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: "H . Peter Anvin" , Kuppuswamy Sathyanarayanan , Kuppuswamy Sathyanarayanan , "Kirill A . Shutemov" , Andy Shevchenko , Tony Luck , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v1 2/6] x86/tdx: Add tdx_hcall_get_quote() API support Date: Tue, 22 Feb 2022 15:17:31 -0800 Message-Id: <20220222231735.268919-3-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220222231735.268919-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20220222231735.268919-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@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. More details about the steps involved in attestation process can be found in TDX Guest-Host Communication Interface (GHCI) for Intel TDX 1.5, section titled "TD attestation" 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 "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 --- arch/x86/coco/tdx.c | 46 ++++++++++++++++++++++++++++++++++++++ arch/x86/include/asm/tdx.h | 2 ++ 2 files changed, 48 insertions(+) diff --git a/arch/x86/coco/tdx.c b/arch/x86/coco/tdx.c index f01b03e41572..2c07f9551d3b 100644 --- a/arch/x86/coco/tdx.c +++ b/arch/x86/coco/tdx.c @@ -21,6 +21,7 @@ /* TDX hypercall Leaf IDs */ #define TDVMCALL_MAP_GPA 0x10001 +#define TDVMCALL_GET_QUOTE 0x10002 /* MMIO direction */ #define EPT_READ 0 @@ -38,6 +39,10 @@ #define TDCALL_INVALID_OPERAND 0x8000000000000000 #define TDCALL_OPERAND_BUSY 0x8000020000000000 +/* TDX hypercall error codes */ +#define TDVMCALL_INVALID_OPERAND 0x8000000000000000 +#define TDVMCALL_GPA_IN_USE 0x8000000000000001 + static struct { unsigned int gpa_width; unsigned long attributes; @@ -129,6 +134,47 @@ int tdx_mcall_tdreport(void *data, void *reportdata) } EXPORT_SYMBOL_GPL(tdx_mcall_tdreport); +/* + * tdx_hcall_get_quote() - Generate TDQUOTE using TDREPORT_STRUCT. + * + * @data : Address of 8KB GPA memory which contains + * TDREPORT_STRUCT. + * + * return 0 on success or failure error number. + */ +int tdx_hcall_get_quote(void *data) +{ + u64 ret; + + /* + * Use confidential guest TDX check to ensure this API is only + * used by TDX guest platforms. + */ + if (!data || !cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return -EINVAL; + + /* + * Pass the physical address of tdreport data to the VMM + * and trigger the tdquote generation. Quote data will be + * stored back in the same physical address space. More info + * about ABI can be found in TDX Guest-Host-Communication + * Interface (GHCI), sec titled "TDG.VP.VMCALL". + */ + ret = _tdx_hypercall(TDVMCALL_GET_QUOTE, cc_mkdec(virt_to_phys(data)), + 0, 0, 0); + + if (ret) { + if (ret == TDVMCALL_INVALID_OPERAND) + return -EINVAL; + else if (ret == TDVMCALL_GPA_IN_USE) + return -EBUSY; + return -EIO; + } + + return 0; +} +EXPORT_SYMBOL_GPL(tdx_hcall_get_quote); + static void get_info(void) { struct tdx_module_output out; diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index b2e76ae8fdf1..e93ca229d512 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -60,6 +60,8 @@ bool tdx_early_handle_ve(struct pt_regs *regs); int tdx_mcall_tdreport(void *data, void *reportdata); +int tdx_hcall_get_quote(void *data); + #else static inline void tdx_early_init(void) { };