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Re: [PATCH v2 for 6.2?] gicv3: fix ICH_MISR's LRENP computation

From: Peter Maydell
Subject: Re: [PATCH v2 for 6.2?] gicv3: fix ICH_MISR's LRENP computation
Date: Tue, 7 Dec 2021 15:24:15 +0000

On Tue, 7 Dec 2021 at 15:18, Brian Cain <bcain@quicinc.com> wrote:
> Peter Maydell wrote:
> > I won't try to put this into 6.2 unless you have a common guest
> > that runs into this bug.

> I know that Qualcomm encounters this issue with its hypervisor 
> (https://github.com/quic/gunyah-hypervisor).  Apologies for not being 
> familiar -- "common guest" means multiple guest systems/OSs that encounter 
> the issue?  Does that mean that it would not suffice to demonstrate the issue 
> for the one known case?

It means "if you see this with a Linux, BSD etc guest that's
more important than if you see this with some oddball thing
nobody else is using and whose users aren't as likely to be
using release versions of QEMU rather than mainline".

The bug is a bug in any case and we'll fix it, it's just a
question of whether it meets the bar to go into 6.2, which is
hopefully going to have its final RC tagged today. If this
patch had arrived a week ago then the bar would have been
lower and it would definitely have gone in. As it is I have
to weigh up the chances of this change causing a regression
for eg KVM running on emulated QEMU.

-- PMM

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