[PATCH Part2 RFC v3 02/37] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT
From: Brijesh Singh <hidden>
Date: 2021-06-02 14:12:06
Also in:
kvm, linux-crypto, linux-mm, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Version 2 of the GHCB specification introduced advertisement of features that are supported by the Hypervisor. Now that KVM supports version 2 of the GHCB specification, bump the maximum supported protocol version. Signed-off-by: Brijesh Singh <redacted> --- arch/x86/include/uapi/asm/svm.h | 2 ++ arch/x86/kvm/svm/sev.c | 14 ++++++++++++++ arch/x86/kvm/svm/svm.h | 3 ++- 3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/uapi/asm/svm.h b/arch/x86/include/uapi/asm/svm.h
index bd64f2b98ac7..de977dd167ca 100644
--- a/arch/x86/include/uapi/asm/svm.h
+++ b/arch/x86/include/uapi/asm/svm.h@@ -114,6 +114,7 @@ #define SVM_VMGEXIT_AP_CREATE_ON_INIT 0 #define SVM_VMGEXIT_AP_CREATE 1 #define SVM_VMGEXIT_AP_DESTROY 2 +#define SVM_VMGEXIT_HV_FT 0x8000fffd #define SVM_VMGEXIT_UNSUPPORTED_EVENT 0x8000ffff #define SVM_EXIT_ERR -1
@@ -224,6 +225,7 @@ { SVM_VMGEXIT_PSC, "vmgexit_page_state_change" }, \ { SVM_VMGEXIT_AP_CREATION, "vmgexit_ap_creation" }, \ { SVM_VMGEXIT_GUEST_REQUEST, "vmgexit_guest_request" }, \ + { SVM_VMGEXIT_HV_FT, "vmgexit_hypervisor_feature" }, \ { SVM_EXIT_ERR, "invalid_guest_state" }
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 7d0b98dbe523..b8505710c36b 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c@@ -2173,6 +2173,7 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm) case SVM_VMGEXIT_AP_HLT_LOOP: case SVM_VMGEXIT_AP_JUMP_TABLE: case SVM_VMGEXIT_UNSUPPORTED_EVENT: + case SVM_VMGEXIT_HV_FT: break; default: goto vmgexit_err;
@@ -2427,6 +2428,13 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS); break; + case GHCB_MSR_HV_FT_REQ: { + set_ghcb_msr_bits(svm, GHCB_HV_FT_SUPPORTED, + GHCB_MSR_HV_FT_MASK, GHCB_MSR_HV_FT_POS); + set_ghcb_msr_bits(svm, GHCB_MSR_HV_FT_RESP, + GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS); + break; + } case GHCB_MSR_TERM_REQ: { u64 reason_set, reason_code;
@@ -2542,6 +2550,12 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) ret = 1; break; } + case SVM_VMGEXIT_HV_FT: { + ghcb_set_sw_exit_info_2(ghcb, GHCB_HV_FT_SUPPORTED); + + ret = 1; + break; + } case SVM_VMGEXIT_UNSUPPORTED_EVENT: vcpu_unimpl(vcpu, "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n",
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index ad12ca26b2d8..5f874168551b 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h@@ -527,9 +527,10 @@ void svm_vcpu_unblocking(struct kvm_vcpu *vcpu); /* sev.c */ -#define GHCB_VERSION_MAX 1ULL +#define GHCB_VERSION_MAX 2ULL #define GHCB_VERSION_MIN 1ULL +#define GHCB_HV_FT_SUPPORTED 0 extern unsigned int max_sev_asid;
--
2.17.1