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.


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