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KVM: X86: implement the logic for spinlock optimization

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get_cpl requires vcpu_load, so we must cache the result (whether the
vcpu was preempted when its cpl=0) in kvm_vcpu_arch.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Longpeng(Mike)
2017-08-08 12:05:33 +08:00
committed by Paolo Bonzini
parent 199b5763d3
commit de63ad4cf4
5 changed files with 21 additions and 4 deletions
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5
arch/x86/kvm/svm.c
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@@ -3749,7 +3749,10 @@ static int interrupt_window_interception(struct vcpu_svm *svm)
static int pause_interception(struct vcpu_svm *svm)
{
kvm_vcpu_on_spin(&svm->vcpu, false);
struct kvm_vcpu *vcpu = &svm->vcpu;
bool in_kernel = (svm_get_cpl(vcpu) == 0);
kvm_vcpu_on_spin(vcpu, in_kernel);
return 1;
}