From: Greg KH <greg@kroah.com>
To: Michael Neuling <mikey@neuling.org>
Cc: stable@vger.kernel.org, mpe@ellerman.id.au
Subject: Re: [PATCH 4.9] powerpc/64s: Clear PCR on boot
Date: Wed, 30 May 2018 10:34:36 +0200 [thread overview]
Message-ID: <20180530083436.GD9685@kroah.com> (raw)
In-Reply-To: <20180529035629.22343-1-mikey@neuling.org>
On Tue, May 29, 2018 at 01:56:29PM +1000, Michael Neuling wrote:
> Clear the PCR (Processor Compatibility Register) on boot to ensure we
> are not running in a compatibility mode.
>
> We've seen this cause problems when a crash (and kdump) occurs while
> running compat mode guests. The kdump kernel then runs with the PCR
> set and causes problems. The symptom in the kdump kernel (also seen in
> petitboot after fast-reboot) is early userspace programs taking
> sigills on newer instructions (seen in libc).
>
> Signed-off-by: Michael Neuling <mikey@neuling.org>
> Cc: stable@vger.kernel.org # v4.9
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> --
>
> Greg, This is a backport for v4.9 only since the original patch didn't
> apply.
>
> Commit faf37c44a105f3608115785f17cbbf3500f8bc71 upstream.
Thanks for this, and the 4.4 backport, both now queued up.
greg k-h
prev parent reply other threads:[~2018-05-30 8:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-29 3:56 [PATCH 4.9] powerpc/64s: Clear PCR on boot Michael Neuling
2018-05-30 8:34 ` Greg KH [this message]
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