linux-kernel - Re: [PATCH] crypto: ccp: shutdown SEV firmware on kexec

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Date:   Wed, 28 Jul 2021 15:41:00 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Brijesh Singh <brijesh.singh@....com>, linux-crypto@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, lucas.nussbaum@...ia.fr,
        stable@...nel.org, Joerg Roedel <jroedel@...e.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] crypto: ccp: shutdown SEV firmware on kexec

On 7/28/21 10:15 AM, Brijesh Singh wrote:
> The commit 97f9ac3db6612 ("crypto: ccp - Add support for SEV-ES to the
> PSP driver") added support to allocate Trusted Memory Region (TMR)
> used during the SEV-ES firmware initialization. The TMR gets locked
> during the firmware initialization and unlocked during the shutdown.
> While the TMR is locked, access to it is disallowed.
> 
> Currently, the CCP driver does not shutdown the firmware during the
> kexec reboot, leaving the TMR memory locked.
> 
> Register a callback to shutdown the SEV firmware on the kexec boot.
> 
> Fixes: 97f9ac3db6612 ("crypto: ccp - Add support for SEV-ES to the PSP driver")
> Reported-by: Lucas Nussbaum <lucas.nussbaum@...ia.fr>
> Tested-by: Lucas Nussbaum <lucas.nussbaum@...ia.fr>
> Cc: <stable@...nel.org>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: Joerg Roedel <jroedel@...e.de>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: David Rientjes <rientjes@...gle.com>
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>

Acked-by: Tom Lendacky <thomas.lendacky@...il.com>

> ---
>  drivers/crypto/ccp/sev-dev.c | 49 +++++++++++++++++-------------------
>  drivers/crypto/ccp/sp-pci.c  | 12 +++++++++
>  2 files changed, 35 insertions(+), 26 deletions(-)
>