summaryrefslogtreecommitdiff
path: root/arch/x86/kvm/lapic.c
diff options
context:
space:
mode:
authorAvi Kivity <avi@redhat.com>2012-07-22 17:41:00 +0300
committerMarcelo Tosatti <mtosatti@redhat.com>2012-07-30 20:47:32 -0300
commit4a4541a40e1fe145c72c4b959fac524a5600d9fb (patch)
tree2d9aa84f2cfa1156603d10002b3d21c9b507f70e /arch/x86/kvm/lapic.c
parentade38c311a0ad8c32e902fe1d0ae74d0d44bc71e (diff)
KVM: Don't update PPR on any APIC read
The current code will update the PPR on almost any APIC read; however that's only required if we read the PPR. kvm_update_ppr() shows up in some profiles, albeit with a low usage (~1%). This should reduce it further (it will still be called during interrupt processing). Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm/lapic.c')
-rw-r--r--arch/x86/kvm/lapic.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index fff7173f6a71..ad7fff7ad13c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -696,12 +696,14 @@ static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
val = apic_get_tmcct(apic);
break;
-
+ case APIC_PROCPRI:
+ apic_update_ppr(apic);
+ val = apic_get_reg(apic, offset);
+ break;
case APIC_TASKPRI:
report_tpr_access(apic, false);
/* fall thru */
default:
- apic_update_ppr(apic);
val = apic_get_reg(apic, offset);
break;
}