Messages in this thread Patch in this message | | | Date | Tue, 9 Nov 2021 21:50:59 +0000 | Subject | [PATCH 4/6] KVM: SEV: WARN if SEV-ES is marked active but SEV is not | From | Sean Christopherson <> |
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WARN if the VM is tagged as SEV-ES but not SEV. KVM relies on SEV and SEV-ES being set atomically, and guards common flows with "is SEV", i.e. observing SEV-ES without SEV means KVM has a fatal bug.
Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/svm/svm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 0d7bbe548ac3..a345f557be4a 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -242,7 +242,7 @@ static inline bool sev_es_guest(struct kvm *kvm) #ifdef CONFIG_KVM_AMD_SEV struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; - return sev_guest(kvm) && sev->es_active; + return sev->es_active && !WARN_ON_ONCE(!sev->active); #else return false; #endif -- 2.34.0.rc0.344.g81b53c2807-goog
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