Commit 83bcacb1 authored Oct 25, 2010 by Avi Kivity

KVM: Avoid double interrupt injection with vapic

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 <avi@redhat.com>

parent 82ca2d10

arch/x86/kvm/lapic.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -277,6 +277,7 @@ static void apic_update_ppr(struct kvm_lapic *apic)

		if (old_ppr != ppr) {
		apic_set_reg(apic, APIC_PROCPRI, ppr);
		if (ppr < old_ppr)
		kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
		}
		}