Re: [Xen-devel] [PATCH] [HVM] Fix virtual apic irq distribution

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Jun 2006, at 04:54, Dong, Eddie wrote:

> 	In SMP guest, each VP has its TSC time and local APIC time which we 
> need to sync them together like above UP approach. Ideally this per VP 
> time should sync with platform time too like PIT (and thus all VP 
> guest time is synced). But the problem is that some VPs may be 
> deactive and thus no way to inject perioidic time IRQ no matter for 
> LOCAL APIC time or PIT time. The solution will be very complicated to 
> this and it may need to change scheduler to do switch in/out with 
> affinity for VPs in same VM.
Yes, it sounds like PIT, LAPIC and TSC of all VCPUs will need to lag in 
sync with furthest-behind LAPIC or TSC of any VCPU. Yield-to in 
scheduler will be useful here.
Thanks for the detailed explanation.

 -- Keir


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