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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-15 16:23:11 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-07-01 12:03:38 +0300 |
| commit | f2485b3e0c6c0aa3a9546babc2fad3739e964ebb (patch) | |
| tree | 07e778e8128e70ad5b38458686ed0cc0f3b87d98 /arch/x86/kvm/svm.c | |
| parent | 91fa0f8e9e2937fd9360f326ad60d51908347afd (diff) | |
| download | linux-f2485b3e0c6c0aa3a9546babc2fad3739e964ebb.tar.xz | |
KVM: x86: use guest_exit_irqoff
This gains a few clock cycles per vmexit. On Intel there is no need
anymore to enable the interrupts in vmx_handle_external_intr, since
we are using the "acknowledge interrupt on exit" feature. AMD
needs to do that, and must be careful to avoid the interrupt shadow.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 5ff292778110..5bfdbbf1ce79 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -4935,6 +4935,12 @@ out: static void svm_handle_external_intr(struct kvm_vcpu *vcpu) { local_irq_enable(); + /* + * We must have an instruction with interrupts enabled, so + * the timer interrupt isn't delayed by the interrupt shadow. + */ + asm("nop"); + local_irq_disable(); } static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu) |