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

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Message-ID: <c88e56fe-e713-b3cf-1be5-a5f4f4d5b038@amd.com>
Date:   Wed, 28 Jul 2021 06:30:53 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Jörg Rödel <jroedel@...e.de>,
        Lucas Nussbaum <lucas.nussbaum@...ia.fr>
Cc:     brijesh.singh@....com, linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Gary Hook <gary.hook@....com>
Subject: Re: [BUG] crypto: ccp: random crashes after kexec on AMD with PSP
 since commit 97f9ac3d


On 7/28/21 6:05 AM, Jörg Rödel wrote:
>> Am 27.07.2021 um 23:13 schrieb Lucas Nussbaum <lucas.nussbaum@...ia.fr>:
>>
>> It is worth noting that there was prior work about getting kexec to
>> work with PSP/SEV (commit f8903b3e, "crypto: ccp - fix the SEV probe in
>> kexec boot path“).
> This patch adds the TMR memory for the PSP. I guess a reboot-notifier is needed which shuts the PSP down and flushes all caches.

Yes, we need to add the kexec shutdown notifier so that TMR memory is
released before the kexec is run. I have add support for it in SNP
series, I will pull the patch out from the series and send it today for
Lucas to verify it.

thanks