KVM: No need to kick cpu if not in a guest mode

This will save a couple of IPIs.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 95fa45c..e3d9040 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3506,6 +3506,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
        smp_mb__after_clear_bit();
 
        if (vcpu->requests || need_resched() || signal_pending(current)) {
+               set_bit(KVM_REQ_KICK, &vcpu->requests);
                local_irq_enable();
                preempt_enable();
                r = 1;