Re: [Xen-devel] [PATCH] x86/hvm: implement save/restore for posted interrupts

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.07.14 at 10:17, <yang.z.zhang@xxxxxxxxx> wrote:
> Jan Beulich wrote on 2014-07-28:
>>>>> On 25.07.14 at 23:31, <kevin.tian@xxxxxxxxx> wrote:
>>> Well, my read of this patch is that it hides some problem other
>>> place by forcing posted injection at restore. As Yang has pointed
>>> out, it is not necessary once the notification has been synced to
>>> IRR it's done (will be noted before vmentry). So at restore path,
>>> it's just about how pending IRR is handled. Now the problem is that
>>> Yang can't reproduce the problem locally (let's see any change with
>>> Olaf's further information), so we need Olaf's help to figure out
>>> the real culprit with
>> our input.
>> 
>> Searching the SDM I can't find any reference to IRR uses during
>> interrupt recognition. The only reference I can find is that during
>> delivery the IRR bit gets cleared and the new RVI determined by
>> scanning IRR. Hence I wonder whether setting RVI post-restore instead of 
> sync-ing IRR to PIR is what is needed?
> 
> vmx_intr_assist() will do it.

Olaf,

any chance you could check that this is actually happening?

Jan


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