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KVM: x86: Don't inhibit APICv/AVIC on xAPIC ID "change" if APIC is disabled

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Don't inhibit APICv/AVIC due to an xAPIC ID mismatch if the APIC is
hardware disabled.  The ID cannot be consumed while the APIC is disabled,
and the ID is guaranteed to be set back to the vcpu_id when the APIC is
hardware enabled (architectural behavior correctly emulated by KVM).

Fixes: 3743c2f025 ("KVM: x86: inhibit APICv/AVIC on changes to APIC ID or APIC base")
Cc: stable@vger.kernel.org
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230106011306.85230-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2023-01-06 01:12:38 +00:00 committed by Paolo Bonzini
parent 5aede752a8
commit a58a66afc4
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/lapic.c
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@ -2072,6 +2072,9 @@ static void kvm_lapic_xapic_id_updated(struct kvm_lapic *apic)
{ {
struct kvm *kvm = apic->vcpu->kvm; struct kvm *kvm = apic->vcpu->kvm;
if (!kvm_apic_hw_enabled(apic))
return;
if (KVM_BUG_ON(apic_x2apic_mode(apic), kvm)) if (KVM_BUG_ON(apic_x2apic_mode(apic), kvm))
return; return;