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Brijesh Singh <brijesh.singh@amd.com> + +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 the GHCB GPA matches with the registered value. +If a mismatch is detected, then abort the guest. + +Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> +Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> +Signed-off-by: Michael Roth <michael.roth@amd.com> +--- + 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 5a8246dd532f..1006bfffe07a 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 3d6c030091c2..b882f72a940a 100644 +--- a/arch/x86/kvm/svm/sev.c ++++ b/arch/x86/kvm/svm/sev.c +@@ -3474,6 +3474,26 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) + set_ghcb_msr_bits(svm, GHCB_MSR_HV_FT_RESP, + 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; + +@@ -3537,6 +3557,13 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) + trace_kvm_vmgexit_enter(vcpu->vcpu_id, svm->sev_es.ghcb); + + sev_es_sync_from_ghcb(svm); ++ ++ /* 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 a3c190642c57..bb04d63012b4 100644 +--- a/arch/x86/kvm/svm/svm.h ++++ b/arch/x86/kvm/svm/svm.h +@@ -208,6 +208,8 @@ struct vcpu_sev_es_state { + u32 ghcb_sa_len; + bool ghcb_sa_sync; + bool ghcb_sa_free; ++ ++ u64 ghcb_registered_gpa; + }; + + struct vcpu_svm { +@@ -361,6 +363,11 @@ static __always_inline bool sev_snp_guest(struct kvm *kvm) + #endif + } + ++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 diff --git a/a/content_digest b/N1/content_digest index 0c58c9e..451c7ae 100644 --- a/a/content_digest +++ b/N1/content_digest @@ -151,6 +151,407 @@ " {\n" " \tvmcb->control.clean = 0;\n" "-- \n" + "2.25.1\n" + "\n" + "\n" + "X-sender: <linux-crypto+bounces-3091-steffen.klassert=secunet.com@vger.kernel.org>\n" + "X-Receiver: <steffen.klassert@secunet.com> ORCPT=rfc822;steffen.klassert@secunet.com; 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a2VyRGlhZ25vc3RpY09wZXJhdG9yLDExLDA7VHJhbnNwb3J0V3JpdG VyUHJvZHVjZXIsMjAsMTI=\n" + "X-MS-Exchange-Forest-IndexAgent: 1 3863\n" + "X-MS-Exchange-Forest-EmailMessageHash: 2FF00194\n" + "X-MS-Exchange-Forest-Language: en\n" + "X-MS-Exchange-Organization-Processed-By-Journaling: Journal Agent\n" + "X-MS-Exchange-Organization-Transport-Properties: DeliveryPriority=Low\n" + "X-MS-Exchange-Organization-Prioritization: 2:RC:REDACTED-af51df60fd698f80b064826f9ee192ca@secunet.com:93/10|SR\n" + "X-MS-Exchange-Organization-IncludeInSla: False:RecipientCountThresholdExceeded\n" + "\n" + "From: Brijesh Singh <brijesh.singh@amd.com>\n" + "\n" + "SEV-SNP guests are required to perform a GHCB GPA registration. Before\n" + "using a GHCB GPA for a vCPU the first time, a guest must register the\n" + "vCPU GHCB GPA. If hypervisor can work with the guest requested GPA then\n" + "it must respond back with the same GPA otherwise return -1.\n" + "\n" + "On VMEXIT, verify that the GHCB GPA matches with the registered value.\n" + "If a mismatch is detected, then abort the guest.\n" + "\n" + "Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>\n" + "Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>\n" + "Signed-off-by: Michael Roth <michael.roth@amd.com>\n" + "---\n" + " arch/x86/include/asm/sev-common.h | 8 ++++++++\n" + " arch/x86/kvm/svm/sev.c | 27 +++++++++++++++++++++++++++\n" + " arch/x86/kvm/svm/svm.h | 7 +++++++\n" + " 3 files changed, 42 insertions(+)\n" + "\n" + "diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h\n" + "index 5a8246dd532f..1006bfffe07a 100644\n" + "--- a/arch/x86/include/asm/sev-common.h\n" + "+++ b/arch/x86/include/asm/sev-common.h\n" + "@@ -59,6 +59,14 @@\n" + " #define GHCB_MSR_AP_RESET_HOLD_RESULT_POS\t12\n" + " #define GHCB_MSR_AP_RESET_HOLD_RESULT_MASK\tGENMASK_ULL(51, 0)\n" + " \n" + "+/* Preferred GHCB GPA Request */\n" + "+#define GHCB_MSR_PREF_GPA_REQ\t\t0x010\n" + "+#define GHCB_MSR_GPA_VALUE_POS\t\t12\n" + "+#define GHCB_MSR_GPA_VALUE_MASK\t\tGENMASK_ULL(51, 0)\n" + "+\n" + "+#define GHCB_MSR_PREF_GPA_RESP\t\t0x011\n" + "+#define GHCB_MSR_PREF_GPA_NONE\t\t0xfffffffffffff\n" + "+\n" + " /* GHCB GPA Register */\n" + " #define GHCB_MSR_REG_GPA_REQ\t\t0x012\n" + " #define GHCB_MSR_REG_GPA_REQ_VAL(v)\t\t\t\\\n" + "diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c\n" + "index 3d6c030091c2..b882f72a940a 100644\n" + "--- a/arch/x86/kvm/svm/sev.c\n" + "+++ b/arch/x86/kvm/svm/sev.c\n" + "@@ -3474,6 +3474,26 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)\n" + " \t\tset_ghcb_msr_bits(svm, GHCB_MSR_HV_FT_RESP,\n" + " \t\t\t\t GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS);\n" + " \t\tbreak;\n" + "+\tcase GHCB_MSR_PREF_GPA_REQ:\n" + "+\t\tset_ghcb_msr_bits(svm, GHCB_MSR_PREF_GPA_NONE, GHCB_MSR_GPA_VALUE_MASK,\n" + "+\t\t\t\t GHCB_MSR_GPA_VALUE_POS);\n" + "+\t\tset_ghcb_msr_bits(svm, GHCB_MSR_PREF_GPA_RESP, GHCB_MSR_INFO_MASK,\n" + "+\t\t\t\t GHCB_MSR_INFO_POS);\n" + "+\t\tbreak;\n" + "+\tcase GHCB_MSR_REG_GPA_REQ: {\n" + "+\t\tu64 gfn;\n" + "+\n" + "+\t\tgfn = get_ghcb_msr_bits(svm, GHCB_MSR_GPA_VALUE_MASK,\n" + "+\t\t\t\t\tGHCB_MSR_GPA_VALUE_POS);\n" + "+\n" + "+\t\tsvm->sev_es.ghcb_registered_gpa = gfn_to_gpa(gfn);\n" + "+\n" + "+\t\tset_ghcb_msr_bits(svm, gfn, GHCB_MSR_GPA_VALUE_MASK,\n" + "+\t\t\t\t GHCB_MSR_GPA_VALUE_POS);\n" + "+\t\tset_ghcb_msr_bits(svm, GHCB_MSR_REG_GPA_RESP, GHCB_MSR_INFO_MASK,\n" + "+\t\t\t\t GHCB_MSR_INFO_POS);\n" + "+\t\tbreak;\n" + "+\t}\n" + " \tcase GHCB_MSR_TERM_REQ: {\n" + " \t\tu64 reason_set, reason_code;\n" + " \n" + "@@ -3537,6 +3557,13 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)\n" + " \ttrace_kvm_vmgexit_enter(vcpu->vcpu_id, svm->sev_es.ghcb);\n" + " \n" + " \tsev_es_sync_from_ghcb(svm);\n" + "+\n" + "+\t/* SEV-SNP guest requires that the GHCB GPA must be registered */\n" + "+\tif (sev_snp_guest(svm->vcpu.kvm) && !ghcb_gpa_is_registered(svm, ghcb_gpa)) {\n" + "+\t\tvcpu_unimpl(&svm->vcpu, \"vmgexit: GHCB GPA [%#llx] is not registered.\\n\", ghcb_gpa);\n" + "+\t\treturn -EINVAL;\n" + "+\t}\n" + "+\n" + " \tret = sev_es_validate_vmgexit(svm);\n" + " \tif (ret)\n" + " \t\treturn ret;\n" + "diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h\n" + "index a3c190642c57..bb04d63012b4 100644\n" + "--- a/arch/x86/kvm/svm/svm.h\n" + "+++ b/arch/x86/kvm/svm/svm.h\n" + "@@ -208,6 +208,8 @@ struct vcpu_sev_es_state {\n" + " \tu32 ghcb_sa_len;\n" + " \tbool ghcb_sa_sync;\n" + " \tbool ghcb_sa_free;\n" + "+\n" + "+\tu64 ghcb_registered_gpa;\n" + " };\n" + " \n" + " struct vcpu_svm {\n" + "@@ -361,6 +363,11 @@ static __always_inline bool sev_snp_guest(struct kvm *kvm)\n" + " #endif\n" + " }\n" + " \n" + "+static inline bool ghcb_gpa_is_registered(struct vcpu_svm *svm, u64 val)\n" + "+{\n" + "+\treturn svm->sev_es.ghcb_registered_gpa == val;\n" + "+}\n" + "+\n" + " static inline void vmcb_mark_all_dirty(struct vmcb *vmcb)\n" + " {\n" + " \tvmcb->control.clean = 0;\n" + "-- \n" 2.25.1 -aca0b8f1d2eabe017e1e45b96d513b9d46fef10c57600b018ab543d3418dacdf +20f575e7b39989a0fba52c52cd8548f1a1c95a97af31f126921b541599d630fd
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