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KVM: SEV: WARN if SEV-ES is marked active but SEV is not

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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>
Message-Id: <20211109215101.2211373-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-11-09 21:50:59 +00:00 committed by Paolo Bonzini
parent a41fb26e61
commit 1bd00a4257
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/svm/svm.h
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@ -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