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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , 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 , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part1 RFC v4 10/36] x86/compressed: Register GHCB memory when SEV-SNP is active Date: Wed, 7 Jul 2021 13:14:40 -0500 Message-Id: <20210707181506.30489-11-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707181506.30489-1-brijesh.singh@amd.com> References: <20210707181506.30489-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.19 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?UgxNCXmCUgUTMmWMAb9PdrjwG0pwFEUihMQVcJWekRE97zP2gg3Tqij6gJZc?= =?us-ascii?Q?CiaibTJCcJbYHsVjGjfP4idKai1atQ//JYk5ln8ag0xdQpkxpYpmWG7RUUy2?= =?us-ascii?Q?7VG/jY101E1W8td/QTvFSv7JhsEEk5rCxBN9m93a7HkRJIcaSup7K/igJgLi?= =?us-ascii?Q?B/umPDzptk+me7vPjVjAv3dtFs63iCxtlQioNyd75yho5/WJGJmfjMcJdGU7?= =?us-ascii?Q?7MnAvzw6w8vL4HKSez2kePVBPDuanXs1LszGgcd578n+1oXZvHWD7OEpxCNs?= =?us-ascii?Q?9VqIIi8R/6RbKYN+bj60ecdsyFpl35PaATvLBN4QsDkZ6Ql/YCZkSD5S4Hnt?= =?us-ascii?Q?am4r/VcIhaljtTuYRHwRQCDz6c5e2/OEmVtUUg+CZTP0ybTiob4hH5rdBcuW?= =?us-ascii?Q?B82OWAtusVtPW6qlqUFE7Kku1E52D6BVSFYCvjn/80hrE7IlE76TcWosCR/R?= =?us-ascii?Q?aynuqHTzueL8t7NW07ysjCWIgs2c1vAOYrjbYcF+FzVQ/29uRzlNbaS/p3AJ?= =?us-ascii?Q?KCu2EpgBZawNtmJaMfvIdCJiZxDFO+hAamgg28Ari6ewYYhqD4F2nDi3kuD/?= =?us-ascii?Q?crJ3wsb53UIcrr8zFqp6kryjl8N7HKiF2NZvNziwxWUBmIzDLXS7/q7PSvrC?= =?us-ascii?Q?/ugaFva9H2vl1Y5rt1ihCx0QPw/Au7MJhH9iU3xP4WN2yTGVuF98pWrrRGPE?= =?us-ascii?Q?YiLXoXExkyf72aEVesnlU4d3HBr2d7QPzNLO0asXD1fT3vNdXsmqEVnAn3A8?= =?us-ascii?Q?On5HS4g4/wclU7H8uGqe8pqgIzTdAoeD658gfBQsIxcCAhrbk2n4yeuBpWbM?= =?us-ascii?Q?Yvi1jcUZFBoPJNVhf7/JRCLjewYLQVpd9cnJCoT4WoG6Eo5ThndvhuDflCX8?= =?us-ascii?Q?bFPqjfOI375uymtIG3iigVX64azbr+eKnIvjhiszoRzKKzQWG1drkSQgqQSb?= =?us-ascii?Q?ek9xfVuAVodenHm4v9UVwXOwE4nVi+6tIRObuy2D99zflRy8bhG3x5Gp+CAd?= =?us-ascii?Q?FS/sd2PoucSrm0k9Ph5f2mJM9xbXAkHUL2P1pXWrkxowkOAil4iwGIuUHJLY?= =?us-ascii?Q?lQq2vQ6Ki0aVnLlhQAMjwvyGYFdoK9lfUaHhIrgWwbuV9YvdUmUQ4bv5CPjr?= =?us-ascii?Q?z2qx1BiRtMwuIJT6ZOiMH0gip2JIdxzV3HX4U8QD11cazQ0pFk1XBuhhyYJR?= =?us-ascii?Q?V/n05LmiIdfYnfRCpEwh/uuZfHEUGm7kBXXwaBfR+2aQWEQrxUhzYiGCgpT7?= =?us-ascii?Q?PfFc99JW892W9tV6QiG2vNYREYAujuGBKKXEUuI/7VhN4jnMCsUEib1jJTcV?= =?us-ascii?Q?UVBoZOX4FUwWnUFNvJ9dAY17?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 87579292-6c40-4a99-2375-08d94173416c X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:15:52.6415 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: a+XWePje5+pPwDmRPplcZC8E43QUtkf+UcHH5FSFQ4/IL4JgC3fz66vO5kIcy793tN6lpaVNV/kLonh79H4zdA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB5016 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org The SEV-SNP guest is required to perform GHCB GPA registration. This is because the hypervisor may prefer that a guest use a consistent and/or specific GPA for the GHCB associated with a vCPU. For more information, see the GHCB specification. If hypervisor can not work with the guest provided GPA then terminate the guest boot. Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/sev.c | 4 ++++ arch/x86/include/asm/sev-common.h | 11 +++++++++++ arch/x86/kernel/sev-shared.c | 16 ++++++++++++++++ 3 files changed, 31 insertions(+) diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index f386d45a57b6..d4cbadf80838 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -233,6 +233,10 @@ static bool do_early_sev_setup(void) /* Initialize lookup tables for the instruction decoder */ inat_init_tables(); + /* SEV-SNP guest requires the GHCB GPA must be registered */ + if (sev_snp_enabled()) + snp_register_ghcb_early(__pa(&boot_ghcb_page)); + return true; } diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index aee07d1bb138..b19d8d301f5d 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -45,6 +45,17 @@ (((unsigned long)reg & GHCB_MSR_CPUID_REG_MASK) << GHCB_MSR_CPUID_REG_POS) | \ (((unsigned long)fn) << GHCB_MSR_CPUID_FUNC_POS)) +/* GHCB GPA Register */ +#define GHCB_MSR_GPA_REG_REQ 0x012 +#define GHCB_MSR_GPA_REG_VALUE_POS 12 +#define GHCB_MSR_GPA_REG_GFN_MASK GENMASK_ULL(51, 0) +#define GHCB_MSR_GPA_REQ_GFN_VAL(v) \ + (((unsigned long)((v) & GHCB_MSR_GPA_REG_GFN_MASK) << GHCB_MSR_GPA_REG_VALUE_POS)| \ + GHCB_MSR_GPA_REG_REQ) + +#define GHCB_MSR_GPA_REG_RESP 0x013 +#define GHCB_MSR_GPA_REG_RESP_VAL(v) ((v) >> GHCB_MSR_GPA_REG_VALUE_POS) + /* SNP Page State Change */ #define GHCB_MSR_PSC_REQ 0x014 #define SNP_PAGE_STATE_PRIVATE 1 diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index c54be2698df0..be4025f14b4f 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -67,6 +67,22 @@ static bool get_hv_features(void) return true; } +static void snp_register_ghcb_early(unsigned long paddr) +{ + unsigned long pfn = paddr >> PAGE_SHIFT; + u64 val; + + sev_es_wr_ghcb_msr(GHCB_MSR_GPA_REQ_GFN_VAL(pfn)); + VMGEXIT(); + + val = sev_es_rd_ghcb_msr(); + + /* If the response GPA is not ours then abort the guest */ + if ((GHCB_RESP_CODE(val) != GHCB_MSR_GPA_REG_RESP) || + (GHCB_MSR_GPA_REG_RESP_VAL(val) != pfn)) + sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_REGISTER); +} + static bool sev_es_negotiate_protocol(void) { u64 val; -- 2.17.1