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| author | Avi Kivity <avi@redhat.com> | 2010-10-25 15:23:55 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-01-12 11:23:36 +0200 |
| commit | 83bcacb1a548d4d8df532376c981277761622bce (patch) | |
| tree | dde9955df18fee353cd01419b625618b6e58cc23 | |
| parent | 82ca2d108b493f7d916975805668bef2096f1147 (diff) | |
| download | linux-83bcacb1a548d4d8df532376c981277761622bce.tar.bz2 | |
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>
| -rw-r--r-- | arch/x86/kvm/lapic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 413f8973a855..93cf9d0d3653 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); } } |