linux-kernel - Re: [PATCH v2] crypto: ccp: Add a quirk to firmware update

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Message-ID: <bb9d1a37-5406-72b7-00f9-4144028f0081@amd.com>
Date:   Wed, 10 Aug 2022 08:24:37 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jarkko Sakkinen <jarkko@...fian.com>,
        Harald Hoyer <harald@...fian.com>,
        John Allen <john.allen@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - SE..." 
        <linux-crypto@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] crypto: ccp: Add a quirk to firmware update

On 8/9/22 17:49, Jarkko Sakkinen wrote:
> From: Jarkko Sakkinen <jarkko@...fian.com>
> 
> A quirk for fixing the committed TCB version, when upgrading from a
> firmware version earlier than 1.50. This is a known issue, and the
> documented workaround is to load the firmware twice.
> 
> Currently, this issue requires the  following workaround:
> 
> sudo modprobe -r kvm_amd
> sudo modprobe -r ccp
> sudo modprobe ccp
> sudo modprobe kvm_amd
> 
> Implement this workaround inside kernel by checking whether the API
> version is less than 1.50, and if so, download the firmware twice.
> This addresses the TCB version issue.
> 
> Link: https://lore.kernel.org/all/de02389f-249d-f565-1136-4af3655fab2a@profian.com/
> Reported-by: Harald Hoyer <harald@...fian.com>
> Signed-off-by: Jarkko Sakkinen <jarkko@...fian.com>

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