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