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Re: [for-5.0 PATCH 0/4] ppc: Fix interrupt controller emulation

From: Greg Kurz
Subject: Re: [for-5.0 PATCH 0/4] ppc: Fix interrupt controller emulation
Date: Mon, 9 Dec 2019 11:59:47 +0100

On Mon, 9 Dec 2019 12:14:28 +1100
David Gibson <address@hidden> wrote:

> On Wed, Dec 04, 2019 at 08:43:31PM +0100, Greg Kurz wrote:
> > Guest hangs have been observed recently on POWER9 hosts, specifically LC92x
> > "Boston" systems, when the guests are being rebooted multiple times. The
> > issue isn't POWER9 specific though. It is caused by a very long standing bug
> > when using the uncommon accel=kvm,kernel-irqchip=off machine configuration
> > which happens to be enforced on LC92x because of a host FW limitation. This
> > affects both the XICS and XIVE emulated interrupt controllers.
> > 
> > The actual fix is in patch 1. Patch 2 is a followup cleanup. The other
> > patches are unrelated cleanups I came up with while investigating.
> > 
> > Since this bug always existed and we're already in rc4, I think it is better
> > to fix it in 5.0 and possibly backport it to stable and downstream if 
> > needed.
> Applied to ppc-for-5.0.

According to Cornelia's comments, it seems I need to respin this against
the s390-next branch to avoid conflicts.

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