Received-SPF: pass (google.com: domain of linux-kernel+bounces-16477-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Date: Thu, 4 Jan 2024 02:01:00 -0800
From: Breno Leitao <leitao@debian.org>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Like Xu <like.xu@linux.intel.com>, Andi Kleen <ak@linux.intel.com>,
	Kan Liang <kan.liang@linux.intel.com>,
	Luwei Kang <luwei.kang@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, rbc@meta.com
Subject: Re: [BUG] Guest OSes die simultaneously (bisected)
Message-ID: <ZZaB3CMiqkUU6qpG@gmail.com>
References: <3d8f5987-e09c-4dd2-a9c0-8ba22c9e948a@paulmck-laptop>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <3d8f5987-e09c-4dd2-a9c0-8ba22c9e948a@paulmck-laptop>

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/