Piteball
/
android_kernel_samsung_msm8976
mirror of https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
1
1
Fork 0
Code Issues Projects Releases Wiki Activity

KVM: Route irq 0 to vcpu 0 exclusively 

Some Linux versions allow the timer interrupt to be processed by more than
one cpu, leading to hangs due to tsc instability.  Work around the issue
by only disaptching the interrupt to vcpu 0.

Problem analyzed (and patch tested) by Sheng Yang.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-02-25 10:28:31 +02:00
parent 0b975a3c2d
commit 8c35f237fb
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
virt/kvm/ioapic.c
View File

@ -211,6 +211,10 @@ static void ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
case IOAPIC_LOWEST_PRIORITY:
vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
deliver_bitmask);
#ifdef CONFIG_X86
if (irq == 0)
vcpu = ioapic->kvm->vcpus[0];
#endif
if (vcpu != NULL)
ioapic_inj_irq(ioapic, vcpu, vector,
trig_mode, delivery_mode);
@ -220,6 +224,10 @@ static void ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
deliver_bitmask, vector, IOAPIC_LOWEST_PRIORITY);
break;
case IOAPIC_FIXED:
#ifdef CONFIG_X86
if (irq == 0)
deliver_bitmask = 1;
#endif
for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
if (!(deliver_bitmask & (1 << vcpu_id)))
continue;