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David Alan Gilbert" , , , , Brijesh Singh Subject: [PATCH v8 35/40] x86/sev: use firmware-validated CPUID for SEV-SNP guests Date: Fri, 10 Dec 2021 09:43:27 -0600 Message-ID: <20211210154332.11526-36-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211210154332.11526-1-brijesh.singh@amd.com> References: <20211210154332.11526-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB03.amd.com (10.181.40.144) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 06398cd6-a5a2-41dc-c345-08d9bbf3fdd9 X-MS-TrafficTypeDiagnostic: BY5PR12MB3793:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; 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:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(46966006)(36840700001)(40470700001)(110136005)(86362001)(7696005)(316002)(36756003)(8676002)(54906003)(8936002)(7406005)(2616005)(16526019)(186003)(26005)(4326008)(81166007)(44832011)(15650500001)(426003)(82310400004)(356005)(83380400001)(336012)(508600001)(7416002)(2906002)(40460700001)(70206006)(5660300002)(70586007)(47076005)(1076003)(6666004)(36860700001)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Dec 2021 15:44:45.6401 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 06398cd6-a5a2-41dc-c345-08d9bbf3fdd9 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT060.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB3793 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth SEV-SNP guests will be provided the location of special 'secrets' and 'CPUID' pages via the Confidential Computing blob. This blob is provided to the run-time kernel either through bootparams field that was initialized by the boot/compressed kernel, or via a setup_data structure as defined by the Linux Boot Protocol. Locate the Confidential Computing from these sources and, if found, use the provided CPUID page/table address to create a copy that the run-time kernel will use when servicing cpuid instructions via a #VC handler. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/include/asm/sev.h | 10 ---------- arch/x86/kernel/sev-shared.c | 2 +- arch/x86/kernel/sev.c | 37 ++++++++++++++++++++++++++++++++++++ 3 files changed, 38 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 4d32af1348ed..76a208fd451b 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -148,16 +148,6 @@ void snp_set_memory_private(unsigned long vaddr, unsigned int npages); void snp_set_wakeup_secondary_cpu(void); bool snp_init(struct boot_params *bp); void snp_abort(void); -/* - * TODO: These are exported only temporarily while boot/compressed/sev.c is - * the only user. This is to avoid unused function warnings for kernel/sev.c - * during the build of kernel proper. - * - * Once the code is added to consume these in kernel proper these functions - * can be moved back to being statically-scoped to units that pull in - * sev-shared.c via #include and these declarations can be dropped. - */ -void snp_cpuid_info_create(const struct cc_blob_sev_info *cc_info); #else static inline void sev_es_ist_enter(struct pt_regs *regs) { } static inline void sev_es_ist_exit(void) { } diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 72836abcdbe2..7bc7e297f88c 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -995,7 +995,7 @@ snp_find_cc_blob_setup_data(struct boot_params *bp) * mapping needs to be updated in sync with all the changes to virtual memory * layout and related mapping facilities throughout the boot process. */ -void __init snp_cpuid_info_create(const struct cc_blob_sev_info *cc_info) +static void __init snp_cpuid_info_create(const struct cc_blob_sev_info *cc_info) { const struct snp_cpuid_info *cpuid_info_fw, *cpuid_info; diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 0e5c45eacc77..70e18b98bb68 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -2001,6 +2001,12 @@ bool __init snp_init(struct boot_params *bp) if (!cc_info) return false; + snp_cpuid_info_create(cc_info); + + /* SEV-SNP CPUID table is set up now. Do some sanity checks. */ + if (!snp_cpuid_active()) + sev_es_terminate(1, GHCB_TERM_CPUID); + /* * The CC blob will be used later to access the secrets page. Cache * it here like the boot kernel does. @@ -2014,3 +2020,34 @@ void __init snp_abort(void) { sev_es_terminate(1, GHCB_SNP_UNSUPPORTED); } + +/* + * It is useful from an auditing/testing perspective to provide an easy way + * for the guest owner to know that the CPUID table has been initialized as + * expected, but that initialization happens too early in boot to print any + * sort of indicator, and there's not really any other good place to do it. So + * do it here, and while at it, go ahead and re-verify that nothing strange has + * happened between early boot and now. + */ +static int __init snp_cpuid_check_status(void) +{ + const struct snp_cpuid_info *cpuid_info = snp_cpuid_info_get_ptr(); + + if (!cc_platform_has(CC_ATTR_SEV_SNP)) { + /* Firmware should not have advertised the feature. */ + if (snp_cpuid_active()) + panic("Invalid use of SEV-SNP CPUID table."); + return 0; + } + + /* CPUID table should always be available when SEV-SNP is enabled. */ + if (!snp_cpuid_active()) + sev_es_terminate(1, GHCB_TERM_CPUID); + + pr_info("Using SEV-SNP CPUID table, %d entries present.\n", + cpuid_info->count); + + return 0; +} + +arch_initcall(snp_cpuid_check_status); -- 2.25.1