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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 Part2 RFC v4 34/40] KVM: SVM: Add support to handle Page State Change VMGEXIT Date: Wed, 7 Jul 2021 13:36:10 -0500 Message-Id: <20210707183616.5620-35-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::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 SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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Signed-off-by: Brijesh Singh --- arch/x86/include/asm/sev-common.h | 7 +++ arch/x86/kvm/svm/sev.c | 80 ++++++++++++++++++++++++++++++- include/linux/sev.h | 3 ++ 3 files changed, 88 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index 2561413cb316..a02175752f2d 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -101,6 +101,13 @@ /* SNP Page State Change NAE event */ #define VMGEXIT_PSC_MAX_ENTRY 253 +/* The page state change hdr structure in not valid */ +#define PSC_INVALID_HDR 1 +/* The hdr.cur_entry or hdr.end_entry is not valid */ +#define PSC_INVALID_ENTRY 2 +/* Page state change encountered undefined error */ +#define PSC_UNDEF_ERR 3 + struct __packed psc_hdr { u16 cur_entry; u16 end_entry; diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 68d275b2a660..0155d9b3127d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2662,6 +2662,7 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm) case SVM_VMGEXIT_AP_JUMP_TABLE: case SVM_VMGEXIT_UNSUPPORTED_EVENT: case SVM_VMGEXIT_HV_FT: + case SVM_VMGEXIT_PSC: break; default: goto vmgexit_err; @@ -2910,7 +2911,8 @@ static int snp_make_page_private(struct kvm_vcpu *vcpu, gpa_t gpa, kvm_pfn_t pfn static int __snp_handle_psc(struct kvm_vcpu *vcpu, int op, gpa_t gpa, int level) { struct kvm *kvm = vcpu->kvm; - int rc, tdp_level; + int rc = PSC_UNDEF_ERR; + int tdp_level; kvm_pfn_t pfn; gpa_t gpa_end; @@ -2945,8 +2947,11 @@ static int __snp_handle_psc(struct kvm_vcpu *vcpu, int op, gpa_t gpa, int level) case SNP_PAGE_STATE_PRIVATE: rc = snp_make_page_private(vcpu, gpa, pfn, level); break; + case SNP_PAGE_STATE_PSMASH: + case SNP_PAGE_STATE_UNSMASH: + /* TODO: Add support to handle it */ default: - rc = -EINVAL; + rc = PSC_INVALID_ENTRY; break; } @@ -2965,6 +2970,68 @@ static int __snp_handle_psc(struct kvm_vcpu *vcpu, int op, gpa_t gpa, int level) return rc; } +static inline unsigned long map_to_psc_vmgexit_code(int rc) +{ + switch (rc) { + case PSC_INVALID_HDR: + return ((1ul << 32) | 1); + case PSC_INVALID_ENTRY: + return ((1ul << 32) | 2); + case RMPUPDATE_FAIL_OVERLAP: + return ((3ul << 32) | 2); + default: return (4ul << 32); + } +} + +static unsigned long snp_handle_psc(struct vcpu_svm *svm, struct ghcb *ghcb) +{ + struct kvm_vcpu *vcpu = &svm->vcpu; + int level, op, rc = PSC_UNDEF_ERR; + struct snp_psc_desc *info; + struct psc_entry *entry; + gpa_t gpa; + + if (!sev_snp_guest(vcpu->kvm)) + goto out; + + if (!setup_vmgexit_scratch(svm, true, sizeof(ghcb->save.sw_scratch))) { + pr_err("vmgexit: scratch area is not setup.\n"); + rc = PSC_INVALID_HDR; + goto out; + } + + info = (struct snp_psc_desc *)svm->ghcb_sa; + entry = &info->entries[info->hdr.cur_entry]; + + if ((info->hdr.cur_entry >= VMGEXIT_PSC_MAX_ENTRY) || + (info->hdr.end_entry >= VMGEXIT_PSC_MAX_ENTRY) || + (info->hdr.cur_entry > info->hdr.end_entry)) { + rc = PSC_INVALID_ENTRY; + goto out; + } + + while (info->hdr.cur_entry <= info->hdr.end_entry) { + entry = &info->entries[info->hdr.cur_entry]; + gpa = gfn_to_gpa(entry->gfn); + level = RMP_TO_X86_PG_LEVEL(entry->pagesize); + op = entry->operation; + + if (!IS_ALIGNED(gpa, page_level_size(level))) { + rc = PSC_INVALID_ENTRY; + goto out; + } + + rc = __snp_handle_psc(vcpu, op, gpa, level); + if (rc) + goto out; + + info->hdr.cur_entry++; + } + +out: + return rc ? map_to_psc_vmgexit_code(rc) : 0; +} + static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) { struct vmcb_control_area *control = &svm->vmcb->control; @@ -3209,6 +3276,15 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) ret = 1; break; } + case SVM_VMGEXIT_PSC: { + unsigned long rc; + + ret = 1; + + rc = snp_handle_psc(svm, ghcb); + ghcb_set_sw_exit_info_2(ghcb, rc); + break; + } case SVM_VMGEXIT_UNSUPPORTED_EVENT: vcpu_unimpl(vcpu, "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n", diff --git a/include/linux/sev.h b/include/linux/sev.h index 82e804a2ee0d..d96900b52aa5 100644 --- a/include/linux/sev.h +++ b/include/linux/sev.h @@ -57,6 +57,9 @@ struct rmpupdate { */ #define FAIL_INUSE 3 +/* RMUPDATE detected 4K page and 2MB page overlap. */ +#define RMPUPDATE_FAIL_OVERLAP 7 + #ifdef CONFIG_AMD_MEM_ENCRYPT struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level); int psmash(struct page *page);