Re: [RFC][PATCH 1/3] Introduce a workqueue to deliver PIT timer interrupts.

Avi Kivity
2010-06-09T14:20:30Z

On 06/09/2010 04:49 PM, Marcelo Tosatti wrote:
>
> Certain guests do not compensate for lost ticks (older RHEL3 for ex),
> and this completly reinjection.
>
> Perhaps you can increase the pending counter on pit_timer_fn, and
> reinject on ACK?
>
> Also, due to
> http://www.mail-archive.com/kvm-devel@lists.sourceforge.net/msg13250.html,
> it should be safer to keep PIT locked to vcpu0 if IOAPIC dest mode is
> lowprio.
>
>

Yes. We don't actually need to lock the PIT to vcpu 0, instead just
make sure the lowprio selection picks vcpu 0 for irq 0/2.

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