From patchwork Fri Oct 8 18:04:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 12545905 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D188C433F5 for ; Fri, 8 Oct 2021 18:05:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2097860F9D for ; Fri, 8 Oct 2021 18:05:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2097860F9D Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 6C45794000D; Fri, 8 Oct 2021 14:05:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 674FF940008; Fri, 8 Oct 2021 14:05:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4A32094000D; Fri, 8 Oct 2021 14:05:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0231.hostedemail.com [216.40.44.231]) by kanga.kvack.org (Postfix) with ESMTP id 35A51940008 for ; Fri, 8 Oct 2021 14:05:38 -0400 (EDT) Received: from smtpin38.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id EF5428249980 for ; Fri, 8 Oct 2021 18:05:37 +0000 (UTC) X-FDA: 78674047914.38.768CE09 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (mail-co1nam11on2074.outbound.protection.outlook.com [40.107.220.74]) by imf07.hostedemail.com (Postfix) with ESMTP id 7308D1001CBF for ; Fri, 8 Oct 2021 18:05:37 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=nJQnBytqjjGdPavCtgTtsewJNgueuXmph/MbtCg62A3KzmZTahN8co6LHT11/13F4GxRhYlhtVLF0fkPGWg9lmp+4YPfq4CECyY8Bk/bxdoH4gsGsoV1t0oY5IDevx3ajfbK0jE/JQ+etHLbl8CkVuliE1uo1sEoRWm+ylV1JQlNdD/w6H1Cq/X7CKagqpZZ02b6EpgoeQyGIM3rib30Q/pvIjLkP8VdOBj7QS+/tm2mh8BJYEMbAuQ+n5py2kHy8+NoVVE1cyd+ADBaMtE+YQJGm/pce6TT6obBIpRgmRj6YkcT7in9rV8tv0O5rjD5LwgDd4qj55LwLmA68M9TRg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=+7JLW7qyMOtwTvf9nO3DychHihJM9mMSUw4fkrt8pak=; b=YIIzVo2v2qr+O6kMzPuX7x51ZDun65bgNzBrBF34UJIVY3j/AGweJVSjLP7qK8oSm3sN9PNjt8qeb8TtHnJZAwrAGBMvaxnOpceHiDGfCjhscugswYAJEVokXIQl1NvthaYSncDBHzAPfqbFqFIGL7JH1bvQ2lM7Tot57/JTOfj6f9BWn0ifAiFmSuUORWEPC2x+laoxnkFbQcxM/rD5+euUziHxbwA68IDfnaZpkVcMy7xqqS4K2sEQXM2yh8aOcHIysRuw0Rl6Oj30sCivybBO3GWnqCwnle/c5+/yQGfoGao5GSP2u5OA+aAR7c26yca0/APXiGA2GELJvE+YTQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=+7JLW7qyMOtwTvf9nO3DychHihJM9mMSUw4fkrt8pak=; b=f0NlTBHz5A5XYzoy+536hVe5ZCyYTPqPQ9rWYspYgGK5pjiBNzgWOAhFLiOmb40br+ZX/nhEsJy/RMFwQGReJ1MP41jO8mttbYTiyFX2d1AsH6ymAfjNr+1U/T7eAiUJQutB1W8WFZYy+gTo3gRtGXgp/bk8fgr6wyvBmW7vOdw= Received: from MWHPR01CA0034.prod.exchangelabs.com (2603:10b6:300:101::20) by MN2PR12MB4157.namprd12.prod.outlook.com (2603:10b6:208:1db::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18; Fri, 8 Oct 2021 18:05:33 +0000 Received: from CO1NAM11FT038.eop-nam11.prod.protection.outlook.com (2603:10b6:300:101:cafe::2e) by MWHPR01CA0034.outlook.office365.com (2603:10b6:300:101::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.16 via Frontend Transport; Fri, 8 Oct 2021 18:05:33 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT038.mail.protection.outlook.com (10.13.174.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4587.18 via Frontend Transport; Fri, 8 Oct 2021 18:05:32 +0000 Received: from sbrijesh-desktop.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Fri, 8 Oct 2021 13:05:25 -0500 From: Brijesh Singh To: , , , , , , CC: Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , "Vitaly Kuznetsov" , Jim Mattson , "Andy Lutomirski" , Dave Hansen , Sergio Lopez , Peter Gonda , "Peter Zijlstra" , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , "Dr . David Alan Gilbert" , , , , Brijesh Singh Subject: [PATCH v6 09/42] x86/sev: Check SEV-SNP features support Date: Fri, 8 Oct 2021 13:04:20 -0500 Message-ID: <20211008180453.462291-10-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211008180453.462291-1-brijesh.singh@amd.com> References: <20211008180453.462291-1-brijesh.singh@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a4ca3b02-8edc-4edd-2689-08d98a863891 X-MS-TrafficTypeDiagnostic: MN2PR12MB4157: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6108; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(36840700001)(46966006)(54906003)(7416002)(4326008)(44832011)(7406005)(70206006)(36860700001)(8936002)(47076005)(110136005)(5660300002)(6666004)(7696005)(316002)(8676002)(36756003)(70586007)(82310400003)(336012)(508600001)(426003)(2616005)(83380400001)(2906002)(26005)(186003)(16526019)(1076003)(356005)(81166007)(86362001)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Oct 2021 18:05:32.7401 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a4ca3b02-8edc-4edd-2689-08d98a863891 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT038.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4157 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 7308D1001CBF X-Stat-Signature: wo9dxsub7g96gnmuqib3c8qejhj41arj Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=f0NlTBHz; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf07.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.220.74 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-HE-Tag: 1633716337-704011 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Version 2 of the GHCB specification added the advertisement of features that are supported by the hypervisor. If hypervisor supports the SEV-SNP then it must set the SEV-SNP features bit to indicate that the base SEV-SNP is supported. Check the SEV-SNP feature while establishing the GHCB, if failed, terminate the guest. Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/sev.c | 16 ++++++++++++++-- arch/x86/include/asm/sev-common.h | 3 +++ arch/x86/kernel/sev.c | 8 ++++++-- 3 files changed, 23 insertions(+), 4 deletions(-) diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index 7760959fe96d..8b0f892c072b 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -119,11 +119,23 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, /* Include code for early handlers */ #include "../../kernel/sev-shared.c" -static bool early_setup_sev_es(void) +static inline bool sev_snp_enabled(void) +{ + return sev_status & MSR_AMD64_SEV_SNP_ENABLED; +} + +static bool do_early_sev_setup(void) { if (!sev_es_negotiate_protocol()) sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_PROT_UNSUPPORTED); + /* + * If SEV-SNP is enabled, then check if the hypervisor supports the SEV-SNP + * features. + */ + if (sev_snp_enabled() && !(sev_hv_features & GHCB_HV_FT_SNP)) + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); + if (set_page_decrypted((unsigned long)&boot_ghcb_page)) return false; @@ -174,7 +186,7 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) struct es_em_ctxt ctxt; enum es_result result; - if (!boot_ghcb && !early_setup_sev_es()) + if (!boot_ghcb && !do_early_sev_setup()) sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); vc_ghcb_invalidate(boot_ghcb); diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index 891569c07ed7..f80a3cde2086 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -64,6 +64,8 @@ /* GHCBData[63:12] */ \ (((u64)(v) & GENMASK_ULL(63, 12)) >> 12) +#define GHCB_HV_FT_SNP BIT_ULL(0) + #define GHCB_MSR_TERM_REQ 0x100 #define GHCB_MSR_TERM_REASON_SET_POS 12 #define GHCB_MSR_TERM_REASON_SET_MASK 0xf @@ -80,6 +82,7 @@ #define SEV_TERM_SET_GEN 0 #define GHCB_SEV_ES_GEN_REQ 0 #define GHCB_SEV_ES_PROT_UNSUPPORTED 1 +#define GHCB_SNP_UNSUPPORTED 2 /* Linux-specific reason codes (used with reason set 1) */ #define SEV_TERM_SET_LINUX 1 diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 427b1c6d08a8..2290fbcc1844 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -631,12 +631,16 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt) * This function runs on the first #VC exception after the kernel * switched to virtual addresses. */ -static bool __init sev_es_setup_ghcb(void) +static bool __init setup_ghcb(void) { /* First make sure the hypervisor talks a supported protocol. */ if (!sev_es_negotiate_protocol()) return false; + /* If SNP is active, make sure that hypervisor supports the feature. */ + if (cc_platform_has(CC_ATTR_SEV_SNP) && !(sev_hv_features & GHCB_HV_FT_SNP)) + sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); + /* * Clear the boot_ghcb. The first exception comes in before the bss * section is cleared. @@ -1444,7 +1448,7 @@ bool __init handle_vc_boot_ghcb(struct pt_regs *regs) enum es_result result; /* Do initial setup or terminate the guest */ - if (unlikely(boot_ghcb == NULL && !sev_es_setup_ghcb())) + if (unlikely(!boot_ghcb && !setup_ghcb())) sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_GEN_REQ); vc_ghcb_invalidate(boot_ghcb);