Re: [Xen-devel] [PATCH 1/3] Revert "x86/vvmx: fix virtual interrupt injection when Ack on exit control is used"

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Mar 23, 2020 at 09:09:59AM +0100, Jan Beulich wrote:
> On 20.03.2020 20:07, Roger Pau Monne wrote:
> > This reverts commit f96e1469ad06b61796c60193daaeb9f8a96d7458.
> > 
> > The commit is wrong, as the whole point of nvmx_update_apicv is to
> > update the guest interrupt status field when the Ack on exit VMEXIT
> > control feature is enabled.
> > 
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> 
> Before anyone gets to look at the other two patches, should this
> be thrown in right away?

I would like if possible get a confirmation from Kevin (or anyone
else) that my understanding is correct. I find the nested code very
confusing, and I've already made a mistake while trying to fix it.
That being said, this was spotted by osstest as introducing a
regression, so I guess it's safe to just toss it in now.

FWIW patch 2/3 attempts to provide a description of my understanding
of how nvmx_update_apicv works.

Thanks, Roger.

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