Merge tag 'trace-fixes-v3.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kvm / lapic.c

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e1adbb4aca753657bfa246ecf56e3b52b130a9ab..0eee2c8b64d1cafecdf7f587dbeef5566b4449df 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1861,11 +1861,14 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
 {
        struct kvm_lapic *apic = vcpu->arch.apic;
        unsigned int sipi_vector;
+       unsigned long pe;
 
-       if (!kvm_vcpu_has_lapic(vcpu))
+       if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events)
                return;
 
-       if (test_and_clear_bit(KVM_APIC_INIT, &apic->pending_events)) {
+       pe = xchg(&apic->pending_events, 0);
+
+       if (test_bit(KVM_APIC_INIT, &pe)) {
                kvm_lapic_reset(vcpu);
                kvm_vcpu_reset(vcpu);
                if (kvm_vcpu_is_bsp(apic->vcpu))
@@ -1873,7 +1876,7 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
                else
                        vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
        }
-       if (test_and_clear_bit(KVM_APIC_SIPI, &apic->pending_events) &&
+       if (test_bit(KVM_APIC_SIPI, &pe) &&
            vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
                /* evaluate pending_events before reading the vector */
                smp_rmb();