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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2023 04:43:05.8365 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 46dfd1bf-083e-4c81-62bc-08db6aff838a 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: DM6NAM11FT024.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6591 X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 78F99A0005 X-Stat-Signature: dcf1en3exfozrixsszu9m6xrqg4p38gp X-HE-Tag: 1686544988-1796 X-HE-Meta: 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 ELZlykxl dGRu7NNhZ102/wgUyvgEQxB2vytVzdXwahyuzbNIR+v6LyhJZqKEKpMcSKDV1PJgwCvOLOcxFhtUV4n5kF+hgNpbvg0BAhhsgaSm2zkS/UQ6jpvAhYEVs8ePWU+WEKhwCAKIPALxDttKnwDx0yumK6uk4kpWiTvcjJDREL9h36P8SCxbdgd+fFY2t0qE3de5W5/2VfhSI2Str7BPlCzK6lWO7Uwe6EU0m7xE3aPZz3Xy7AtkDFxycYJ0oPj8KiIXGS6gZB2vs4pfrkummncfZuNbEV1dpfq6ATWYvJMAspxlPsBTLJZHDWqRe9F9hba/knuhMmx/G+zOqNh30R07MRnn8Fg== 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 SEV-SNP guests are required to perform a GHCB GPA registration. Before using a GHCB GPA for a vCPU the first time, a guest must register the vCPU GHCB GPA. If hypervisor can work with the guest requested GPA then it must respond back with the same GPA otherwise return -1. On VMEXIT, Verify that GHCB GPA matches with the registered value. If a mismatch is detected then abort the guest. Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- arch/x86/include/asm/sev-common.h | 8 ++++++++ arch/x86/kvm/svm/sev.c | 27 +++++++++++++++++++++++++++ arch/x86/kvm/svm/svm.h | 7 +++++++ 3 files changed, 42 insertions(+) diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index aaea4afcda98..d499730e1f15 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -59,6 +59,14 @@ #define GHCB_MSR_AP_RESET_HOLD_RESULT_POS 12 #define GHCB_MSR_AP_RESET_HOLD_RESULT_MASK GENMASK_ULL(51, 0) +/* Preferred GHCB GPA Request */ +#define GHCB_MSR_PREF_GPA_REQ 0x010 +#define GHCB_MSR_GPA_VALUE_POS 12 +#define GHCB_MSR_GPA_VALUE_MASK GENMASK_ULL(51, 0) + +#define GHCB_MSR_PREF_GPA_RESP 0x011 +#define GHCB_MSR_PREF_GPA_NONE 0xfffffffffffff + /* GHCB GPA Register */ #define GHCB_MSR_REG_GPA_REQ 0x012 #define GHCB_MSR_REG_GPA_REQ_VAL(v) \ diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index a7cbdc24ccdb..44fdcf407759 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3312,6 +3312,27 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS); break; } + case GHCB_MSR_PREF_GPA_REQ: { + set_ghcb_msr_bits(svm, GHCB_MSR_PREF_GPA_NONE, GHCB_MSR_GPA_VALUE_MASK, + GHCB_MSR_GPA_VALUE_POS); + set_ghcb_msr_bits(svm, GHCB_MSR_PREF_GPA_RESP, GHCB_MSR_INFO_MASK, + GHCB_MSR_INFO_POS); + break; + } + case GHCB_MSR_REG_GPA_REQ: { + u64 gfn; + + gfn = get_ghcb_msr_bits(svm, GHCB_MSR_GPA_VALUE_MASK, + GHCB_MSR_GPA_VALUE_POS); + + svm->sev_es.ghcb_registered_gpa = gfn_to_gpa(gfn); + + set_ghcb_msr_bits(svm, gfn, GHCB_MSR_GPA_VALUE_MASK, + GHCB_MSR_GPA_VALUE_POS); + set_ghcb_msr_bits(svm, GHCB_MSR_REG_GPA_RESP, GHCB_MSR_INFO_MASK, + GHCB_MSR_INFO_POS); + break; + } case GHCB_MSR_TERM_REQ: { u64 reason_set, reason_code; @@ -3378,6 +3399,12 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) exit_code = ghcb_get_sw_exit_code(ghcb); + /* SEV-SNP guest requires that the GHCB GPA must be registered */ + if (sev_snp_guest(svm->vcpu.kvm) && !ghcb_gpa_is_registered(svm, ghcb_gpa)) { + vcpu_unimpl(&svm->vcpu, "vmgexit: GHCB GPA [%#llx] is not registered.\n", ghcb_gpa); + return -EINVAL; + } + ret = sev_es_validate_vmgexit(svm); if (ret) return ret; diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 9a7cafb018fe..02edbdd443e4 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -205,6 +205,8 @@ struct vcpu_sev_es_state { u32 ghcb_sa_len; bool ghcb_sa_sync; bool ghcb_sa_free; + + u64 ghcb_registered_gpa; }; struct vcpu_svm { @@ -359,6 +361,11 @@ static __always_inline bool sev_snp_guest(struct kvm *kvm) return sev_es_guest(kvm) && sev->snp_active; } +static inline bool ghcb_gpa_is_registered(struct vcpu_svm *svm, u64 val) +{ + return svm->sev_es.ghcb_registered_gpa == val; +} + static inline void vmcb_mark_all_dirty(struct vmcb *vmcb) { vmcb->control.clean = 0; -- 2.25.1