linux-kernel - Re: [BUG] Guest OSes die simultaneously (bisected)

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Message-ID: <ZZaB3CMiqkUU6qpG@gmail.com>
Date: Thu, 4 Jan 2024 02:01:00 -0800
From: Breno Leitao <leitao@...ian.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Like Xu <like.xu@...ux.intel.com>, Andi Kleen <ak@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Luwei Kang <luwei.kang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, rbc@...a.com
Subject: Re: [BUG] Guest OSes die simultaneously (bisected)

On Wed, Jan 03, 2024 at 02:22:23PM -0800, Paul E. McKenney wrote:
> I was
> therefore forced to bisect among the commits backported to the internal
> v5.19-based kernel, which fingered the backported version of the patch
> called out above.

Just to add some context to these backport, this commit (c59a1f106f5c)
was backported to the internal v5.19-based kernel in order to easily
backport these two fixes.

	a16eb25b09c02a54c ("KVM: x86: Mask LVTPC when handling a PMI")
	73554b29bd70546c1 ("KVM: x86/pmu: Synthesize at most one PMI per VM-exit")

They are required to solve the softlockup problem reported here:

	https://lore.kernel.org/all/ZRwcpki67uhpAUKi@gmail.com/