xiaomi-sm8450/android_kernel_xiaomi_sm8450
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KVM: Drop kvm->irq_lock lock from irq injection path

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The only thing it protects now is interrupt injection into lapic and
this can work lockless. Even now with kvm->irq_lock in place access
to lapic is not entirely serialized since vcpu access doesn't take
kvm->irq_lock.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov
2009-08-24 11:54:26 +03:00
committed by Avi Kivity
parent eba0226bdf
commit 680b3648ba
7 changed files with 1 additions and 17 deletions
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2
arch/x86/kvm/i8254.c
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@@ -688,10 +688,8 @@ static void __inject_pit_timer_intr(struct kvm *kvm)
struct kvm_vcpu *vcpu;
int i;
mutex_lock(&kvm->irq_lock);
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1);
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0);
mutex_unlock(&kvm->irq_lock);
/*
* Provides NMI watchdog support via Virtual Wire mode.