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Date: Fri, 29 Mar 2024 13:21:20 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Marc Zyngier <maz@kernel.org>
Cc: Krister Johansen <kjlx@templeofstupid.com>, stable@vger.kernel.org,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	David Matlack <dmatlack@google.com>, kvm@vger.kernel.org
Subject: Re: [PATCH 5.15.y v2 0/2] fix softlockups in stage2_apply_range()
Message-ID: <2024032913-felt-tip-fasting-5fab@gregkh>
References: <cover.1709665227.git.kjlx@templeofstupid.com>
 <cover.1709685364.git.kjlx@templeofstupid.com>
 <878r2vr7tj.wl-maz@kernel.org>
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In-Reply-To: <878r2vr7tj.wl-maz@kernel.org>

On Wed, Mar 06, 2024 at 10:08:40AM +0000, Marc Zyngier wrote:
> On Wed, 06 Mar 2024 00:49:34 +0000,
> Krister Johansen <kjlx@templeofstupid.com> wrote:
> > 
> > Hi Stable Team,
> > In 5.15, unmapping large kvm vms on arm64 can generate softlockups.  My team has
> > been hitting this when tearing down VMs > 100Gb in size.
> > 
> > Oliver fixed this with the attached patches.  They've been in mainline since
> > 6.1.
> > 
> > I tested on 5.15.150 with these patches applied. When they're present,
> > both the dirty_log_perf_test detailed in the second patch, and
> > kvm_page_table_test no longer generate softlockups when unmapping VMs
> > with large memory configurations.
> > 
> > Would you please consider these patches for inclusion in an upcoming 5.15
> > release?
> > 
> > Change in v2:  I ran format-patch without the --from option which incorrectly
> > generated the first series without leaving Oliver in place as the author.  The
> > v2 should retain the correct authorship.  Apologies for the mistake.
> 
> Thanks for this.
> 
> FWIW,
> 
> Acked-by: Marc Zyngier <maz@kernel.org>

Now queued up,t hanks.

greg k-h