On Sat, Apr 19, 2008 at 03:47:31PM -0700, Alex Davis wrote:
> --- On Fri, 4/18/08, Avi Kivity <[EMAIL PROTECTED]> wrote:
>
> > From: Avi Kivity <[EMAIL PROTECTED]>
> > Subject: Re: [kvm-devel] Second KVM process hangs eating 80-100% CPU on
> > host during startup
> [snip]
>
> I tried booting the guest with 'lpj=10682525' to work around the
> calibrate_delay issue, but that gave me:
>
> [ 0.004100] ENABLING IO-APIC IRQs
> [ 0.004100] ..TIMER: vector=0x31 apic1=0 pin1=0 apic2=-1 pin2=-1
> [ 0.004100] ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> [ 0.004100] ...trying to set up timer (IRQ0) through the 8259A ... failed.
> [ 0.004100] ...trying to set up timer as Virtual Wire IRQ ... failed.
> [ 0.004100] ...trying to set up timer as ExtINT IRQ ... failed :(.
> [ 0.004100] Kernel panic - not syncing: IO-APIC + timer doesn't work! Boot
> with apic=debug and send a report.Then try booting with the 'noapic' option.
>
> Booting with 'apic=debug' gives these additional lines:
> [ 0.004100] Getting VERSION: 50014
> [ 0.004100] Getting VERSION: 50014
> [ 0.004100] Getting ID: 0
> [ 0.004100] Getting LVT0: 700
> [ 0.004100] Getting LVT1: 10000
Hi Alex,
Can you please try the following.
KVM: PIT: make last_injected_time per-guest
Otherwise multiple guests use the same variable and boom.
Also use kvm_vcpu_kick() to make sure that if a timer triggers on
a different CPU the event won't be missed.
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 2852dd1..5697ad2 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -200,10 +200,8 @@ int __pit_timer_fn(struct kvm_kpit_state *ps)
atomic_inc(&pt->pending);
smp_mb__after_atomic_inc();
- if (vcpu0 && waitqueue_active(&vcpu0->wq)) {
- vcpu0->arch.mp_state = KVM_MP_STATE_RUNNABLE;
- wake_up_interruptible(&vcpu0->wq);
- }
+ if (vcpu0)
+ kvm_vcpu_kick(vcpu0);
pt->timer.expires = ktime_add_ns(pt->timer.expires, pt->period);
pt->scheduled = ktime_to_ns(pt->timer.expires);
@@ -572,7 +570,6 @@ void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
struct kvm *kvm = vcpu->kvm;
struct kvm_kpit_state *ps;
- static unsigned long last_injected_time;
if (vcpu && pit) {
ps = &pit->pit_state;
@@ -582,11 +579,11 @@ void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
* 2. Last interrupt was accepted or waited for too long time*/
if (atomic_read(&ps->pit_timer.pending) &&
(ps->inject_pending ||
- (jiffies - last_injected_time
+ (jiffies - ps->last_injected_time
>= KVM_MAX_PIT_INTR_INTERVAL))) {
ps->inject_pending = 0;
__inject_pit_timer_intr(kvm);
- last_injected_time = jiffies;
+ ps->last_injected_time = jiffies;
}
}
}
diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h
index e63ef38..db25c2a 100644
--- a/arch/x86/kvm/i8254.h
+++ b/arch/x86/kvm/i8254.h
@@ -35,6 +35,7 @@ struct kvm_kpit_state {
struct mutex lock;
struct kvm_pit *pit;
bool inject_pending; /* if inject pending interrupts */
+ unsigned long last_injected_time;
};
struct kvm_pit {
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