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

>>> 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?


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