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KVM: x86: ignore APICv if LAPIC is not enabled

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Synchronize the two calls to kvm_x86_sync_pir_to_irr.  The one
in the reenter-guest fast path invoked the callback unconditionally
even if LAPIC is present but disabled.  In this case, there are
no interrupts to deliver, and therefore posted interrupts can
be ignored.

Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-11-17 07:35:44 -05:00
parent 5f25e71e31
commit 78311a5140
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/x86.c
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@ -9849,7 +9849,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST))
break;
if (vcpu->arch.apicv_active)
if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
static_call(kvm_x86_sync_pir_to_irr)(vcpu);
if (unlikely(kvm_vcpu_exit_request(vcpu))) {