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

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

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.

> 
> Jan


Best regards,
Yang



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