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

From: David Gibson
Subject: Re: [for-5.0 PATCH 0/4] ppc: Fix interrupt controller emulation
Date: Mon, 9 Dec 2019 12:14:28 +1100
User-agent: Mutt/1.12.1 (2019-06-15)

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.

David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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