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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2023 04:37:52.1218 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2a304f1d-13d0-4bf6-408d-08db6afec899 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: CO1PEPF000042AC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7823 X-Rspamd-Queue-Id: 84F4F100008 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: dy7z6h5tp1ar8c7prpi7oo1zg9k5hf8e X-HE-Tag: 1686544677-958346 X-HE-Meta: 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 HE5Br5DW 3vBpilYj6sLtdfeYsYfHp7bkvUGG1HNgppawARqyK1I4Jzjmp+vHEu7t389OxRtXI7SxVQ6jiom0iC7M/u/bWoj+8+Q4WX0qN5ld3rPnpBYQ1LUe94jovXTy9V65ZQQ1cGCj5B2P/nHQvjjCiV/qlzvJI6V2v7CWW+ek4x/uLd53D689ehCCKY+YXGQZRHkxdoykQk5VA3r+meGLjkEdShqPZUBJaf3i7P5JBfEdMJyMzYHihe+NZPKvCr7yGrTG9gVFwdgv5Ihvuk+BsP0u0yCmJtSDIYZXpHTNGMOq125oMTgnS0tjc2vY/kPjlTOrzSWoYaI4coadfmVB2MSkR4WGQWg== 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: From: Brijesh Singh The next generation of SEV is called SEV-SNP (Secure Nested Paging). SEV-SNP builds upon existing SEV and SEV-ES functionality while adding new hardware based security protection. SEV-SNP adds strong memory encryption integrity protection to help prevent malicious hypervisor-based attacks such as data replay, memory re-mapping, and more, to create an isolated execution environment. The SNP feature is added incrementally, the later patches adds a new module parameters that can be used to enabled SEV-SNP in the KVM. Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- arch/x86/kvm/svm/sev.c | 10 +++++++++- arch/x86/kvm/svm/svm.h | 8 ++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 69b57e8f0a7f..f5fcf6c33583 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -58,6 +58,9 @@ module_param_named(sev_es, sev_es_enabled, bool, 0444); #define sev_es_enabled false #endif /* CONFIG_KVM_AMD_SEV */ +/* enable/disable SEV-SNP support */ +static bool sev_snp_enabled; + #define AP_RESET_HOLD_NONE 0 #define AP_RESET_HOLD_NAE_EVENT 1 #define AP_RESET_HOLD_MSR_PROTO 2 @@ -2169,6 +2172,7 @@ void __init sev_hardware_setup(void) { #ifdef CONFIG_KVM_AMD_SEV unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count; + bool sev_snp_supported = false; bool sev_es_supported = false; bool sev_supported = false; @@ -2248,12 +2252,16 @@ void __init sev_hardware_setup(void) if (misc_cg_set_capacity(MISC_CG_RES_SEV_ES, sev_es_asid_count)) goto out; - pr_info("SEV-ES supported: %u ASIDs\n", sev_es_asid_count); sev_es_supported = true; + sev_snp_supported = sev_snp_enabled && cpu_feature_enabled(X86_FEATURE_SEV_SNP); + + pr_info("SEV-ES %ssupported: %u ASIDs\n", + sev_snp_supported ? "and SEV-SNP " : "", sev_es_asid_count); out: sev_enabled = sev_supported; sev_es_enabled = sev_es_supported; + sev_snp_enabled = sev_snp_supported; #endif } diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index e45b54e95495..6974d63c84f9 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -77,6 +77,7 @@ enum { struct kvm_sev_info { bool active; /* SEV enabled guest */ bool es_active; /* SEV-ES enabled guest */ + bool snp_active; /* SEV-SNP enabled guest */ unsigned int asid; /* ASID used for this guest */ unsigned int handle; /* SEV firmware handle */ int fd; /* SEV device fd */ @@ -346,6 +347,13 @@ static __always_inline bool sev_es_guest(struct kvm *kvm) #endif } +static __always_inline bool sev_snp_guest(struct kvm *kvm) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + + return sev_es_guest(kvm) && sev->snp_active; +} + static inline void vmcb_mark_all_dirty(struct vmcb *vmcb) { vmcb->control.clean = 0;