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Peter Anvin" Subject: [RFC 14/16] KVM: selftests: add helpers for SEV-SNP-related instructions/exits Date: Tue, 5 Oct 2021 18:44:57 -0500 Message-Id: <20211005234459.430873-15-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211005234459.430873-1-michael.roth@amd.com> References: <20211005234459.430873-1-michael.roth@amd.com> X-ClientProxiedBy: SA0PR12CA0008.namprd12.prod.outlook.com (2603:10b6:806:6f::13) To CH2PR12MB4133.namprd12.prod.outlook.com (2603:10b6:610:7a::13) MIME-Version: 1.0 Received: from localhost (165.204.77.1) by SA0PR12CA0008.namprd12.prod.outlook.com (2603:10b6:806:6f::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18 via Frontend Transport; Tue, 5 Oct 2021 23:45:54 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e7d518b7-110a-4923-d5e1-08d9885a4591 X-MS-TrafficTypeDiagnostic: CH2PR12MB3925: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: e7d518b7-110a-4923-d5e1-08d9885a4591 X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4133.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2021 23:45:54.8262 (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: 8R08/G5LHXpIyOYxkHvVRycbhn48YUU3l0riiXy7OkdCdoGQIek5alJVC95SUHtYCyN8+xVXEKLwJJwZ3X7+Bw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3925 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Extend the existing sev_exitlib with helpers for handling pvalidate instructions and issuing page-state changes via the GHCB MSR protocol. Subsequent SEV-SNP-related tests will make use of these in guest code. Signed-off-by: Michael Roth --- .../kvm/include/x86_64/sev_exitlib.h | 6 ++ .../selftests/kvm/lib/x86_64/sev_exitlib.c | 77 +++++++++++++++++++ 2 files changed, 83 insertions(+) diff --git a/tools/testing/selftests/kvm/include/x86_64/sev_exitlib.h b/tools/testing/selftests/kvm/include/x86_64/sev_exitlib.h index 4b67b4004dfa..5c7356f9e925 100644 --- a/tools/testing/selftests/kvm/include/x86_64/sev_exitlib.h +++ b/tools/testing/selftests/kvm/include/x86_64/sev_exitlib.h @@ -8,7 +8,13 @@ #ifndef SELFTEST_KVM_SEV_EXITLIB_H #define SELFTEST_KVM_SEV_EXITLIB_H +#define PVALIDATE_NO_UPDATE 255 + int sev_es_handle_vc(void *ghcb, u64 ghcb_gpa, struct ex_regs *regs); void sev_es_terminate(int reason); +void snp_register_ghcb(u64 ghcb_gpa); +void snp_psc_set_shared(u64 gpa); +void snp_psc_set_private(u64 gpa); +int snp_pvalidate(void *ptr, bool rmp_psize, bool validate); #endif /* SELFTEST_KVM_SEV_EXITLIB_H */ diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c index b3f7b0297e5b..546b402d5015 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c +++ b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c @@ -51,6 +51,19 @@ #define GHCB_REG_GPA_RESP(resp) ((resp) & GENMASK_ULL(11, 0)) #define GHCB_REG_GPA_RESP_VAL(resp) ((resp) >> 12) +/* GHCB MSR protocol for Page State Change */ +#define GHCB_PSC_REQ_PRIVATE 1 +#define GHCB_PSC_REQ_SHARED 2 +#define GHCB_PSC_REQ_PSMASH 3 +#define GHCB_PSC_REQ_UNSMASH 4 +#define GHCB_PSC_REQ_CODE 0x14UL +#define GHCB_PSC_REQ(gfn, op) \ + (((unsigned long)((op) & 0xf) << 52) | \ + ((unsigned long)((gfn) & ~(1ULL << 40)) << 12) | \ + GHCB_PSC_REQ_CODE) +#define GHCB_PSC_RESP_CODE 0x15UL +#define GHCB_PSC_RESP(resp) ((resp) & GENMASK_ULL(11, 0)) + /* GHCB format/accessors */ struct ghcb { @@ -247,3 +260,67 @@ int sev_es_handle_vc(void *ghcb, u64 ghcb_gpa, struct ex_regs *regs) return handle_vc_cpuid(ghcb, ghcb_gpa, regs); } + +void snp_register_ghcb(u64 ghcb_gpa) +{ + u64 gfn = ghcb_gpa >> PAGE_SHIFT; + u64 resp; + + sev_es_wrmsr_ghcb(GHCB_REG_GPA_REQ(gfn)); + VMGEXIT(); + + resp = sev_es_rdmsr_ghcb(); + if (GHCB_REG_GPA_RESP(resp) != GHCB_REG_GPA_RESP_CODE || + GHCB_REG_GPA_RESP_VAL(resp) != gfn) + sev_es_terminate(GHCB_TERMINATE_REASON_UNSPEC); +} + +static void snp_psc_request(u64 gfn, int op) +{ + u64 resp; + + sev_es_wrmsr_ghcb(GHCB_PSC_REQ(gfn, op)); + VMGEXIT(); + + resp = sev_es_rdmsr_ghcb(); + if (GHCB_PSC_RESP(resp) != GHCB_PSC_RESP_CODE) + sev_es_terminate(GHCB_TERMINATE_REASON_UNSPEC); +} + +void snp_psc_set_shared(u64 gpa) +{ + snp_psc_request(gpa >> PAGE_SHIFT, GHCB_PSC_REQ_SHARED); +} + +void snp_psc_set_private(u64 gpa) +{ + snp_psc_request(gpa >> PAGE_SHIFT, GHCB_PSC_REQ_PRIVATE); +} + +/* From arch/x86/include/asm/asm.h */ +#ifdef __GCC_ASM_FLAG_OUTPUTS__ +# define CC_SET(c) "\n\t/* output condition code " #c "*/\n" +# define CC_OUT(c) "=@cc" #c +#else +# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" +# define CC_OUT(c) [_cc_ ## c] "=qm" +#endif + +int snp_pvalidate(void *ptr, bool rmp_psize, bool validate) +{ + uint64_t gva = (uint64_t)ptr; + bool no_rmpupdate; + int rc; + + /* "pvalidate" mnemonic support in binutils 2.36 and newer */ + asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t" + CC_SET(c) + : CC_OUT(c) (no_rmpupdate), "=a"(rc) + : "a"(gva), "c"(rmp_psize), "d"(validate) + : "memory", "cc"); + + if (no_rmpupdate) + return PVALIDATE_NO_UPDATE; + + return rc; +}