Re: [Xen-devel] [PATCH][v2] Hybrid extension support in Xen

[Sheng Yang <sheng@xxxxxxxxxxxxxxx>]

On Tuesday 02 February 2010 22:32:09 Keir Fraser wrote:
> On 02/02/2010 14:08, "Sheng Yang" <sheng@xxxxxxxxxxxxxxx> wrote:
> >> Okay, so that leads to the obvious next question: why do you want to
> >> avoid using INIT-SIPI-SIPI?
> >
> > Because we don't have IOAPIC/LAPIC...
> 
> Is it necessary to remove the LAPICs completely? If you go very far down
>  the route of ripping emulated stuff out of HVM, it starts to feel like
>  starting with a pure PV guest and HVMing it up is closer in spirit to what
>  you might be aiming for.

The performance of interrupt delivery is what we care about. The IOAPIC/LAPIC 
don't work well now, so we want event channel to eliminate their overhead, 
notably EOI in LAPIC.

And you know, start from a PV guest is another story...

-- 
regards
Yang, Sheng


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