From: Avi Kivity <[email protected]> After an interrupt injection, the PPR changes, and we have to reflect that into the vapic. This causes a KVM_REQ_EVENT to be set, which causes the whole interrupt injection routine to be run again (harmlessly).
Optimize by only setting KVM_REQ_EVENT if the ppr was lowered; otherwise there is no chance that a new injection is needed. Signed-off-by: Avi Kivity <[email protected]> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 413f897..93cf9d0 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -277,7 +277,8 @@ static void apic_update_ppr(struct kvm_lapic *apic) if (old_ppr != ppr) { apic_set_reg(apic, APIC_PROCPRI, ppr); - kvm_make_request(KVM_REQ_EVENT, apic->vcpu); + if (ppr < old_ppr) + kvm_make_request(KVM_REQ_EVENT, apic->vcpu); } } -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
