Re: [Xen-devel] [PATCH 0 of 5] PV on HVM Xen

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 15 Mar 2010, Sheng Yang wrote:
> Hi Stefano
> 
> I've checked your patches. And one point puzzled me(I am looking into pv_ops 
> dom0 code): seems if it depends on PIRQ, it would still require to do 
> EOI(then 
> result in vmexit) for edge triggered interrupt? (through xen_pirq_chip->end). 
> And unmask is still a heavy work required vmexit?(seems it need twice vmexit, 
> even heavier than current HVM solution)
> 
 
Only when pirq_needs_eoi(irq) returns true, and this happens when
PIRQ_NEEDS_EOI is set.
In my patch series I am making sure PIRQ_NEEDS_EOI is never set for any
pirq on HVM.


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