linux-kernel - Re: [BUG] crypto: ccp: random crashes after kexec on AMD with PSP since commit 97f9ac3d

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Message-ID: <YQFrb1EWFL2v8mEf@xanadu.blop.info>
Date:   Wed, 28 Jul 2021 16:36:31 +0200
From:   Lucas Nussbaum <lucas.nussbaum@...ia.fr>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     thomas.lendacky@....com, jroedel@...e.de,
        herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org
Subject: Re: [BUG] crypto: ccp: random crashes after kexec on AMD with PSP
 since commit 97f9ac3d

Hi Brijesh,

On 28/07/21 at 08:36 -0500, Brijesh Singh wrote:
> Hi Lucas,
> 
> >On several AMD systems, we see random crashes after kexec, during the
> >boot of the new system (typically 1 out of 5 boots ends up with a
> >crash).
> 
> >According to git bisect, the regression was introduced by commit
> >97f9ac3d ("crypto: ccp - Add support for SEV-ES to the PSP driver"),
> >included since 5.8-rc1. 5.14-rc3 is still affected.
> 
> Can you try the below patch and confirm whether it fixes the random
> crashes seen during the kexec.

I confirm that this fixes the crashes I was seeing.

Tested-by: Lucas Nussbaum <lucas.nussbaum@...ia.fr>

Lucas