KVM: only sync when attention bits set
Commit eb0dc6d0368072236dcd086d7fdc17fd3c4574d4 introduced apic attention bitmask but kvm still syncs lapic unconditionally. As that commit suggested and in anticipation of adding more attention bits, only sync lapic if(apic_attention). Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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1 changed files with 2 additions and 1 deletions
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@ -5388,7 +5388,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
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if (unlikely(vcpu->arch.tsc_always_catchup))
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kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
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kvm_lapic_sync_from_vapic(vcpu);
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if (vcpu->arch.apic_attention)
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kvm_lapic_sync_from_vapic(vcpu);
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r = kvm_x86_ops->handle_exit(vcpu);
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out:
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