linux-kernel - Re: [PATCH v3 01/14] virt: sev-guest: Use AES GCM crypto library

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Message-ID: <a056ff8f-1dab-72b4-133f-a6578c7216ad@amd.com>
Date:   Tue, 1 Aug 2023 10:32:28 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Nikunj A Dadhania <nikunj@....com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Cc:     bp@...en8.de, dionnaglaze@...gle.com, pgonda@...gle.com,
        seanjc@...gle.com, pbonzini@...hat.com
Subject: Re: [PATCH v3 01/14] virt: sev-guest: Use AES GCM crypto library

On 7/22/23 06:18, Nikunj A Dadhania wrote:
> The sev-guest driver encryption code uses Crypto API for SNP guest
> messaging to interact with AMD Security processor. For enabling SecureTSC,
> SEV-SNP guests need to send a TSC_INFO request guest message before the
> smpboot phase starts. Details from the TSC_INFO response will be used to
> program the VMSA before the secondary CPUs are brought up. The Crypto API
> is not available this early in the boot phase.
> 
> In preparation of moving the encryption code out of sev-guest driver to
> support SecureTSC and make reviewing the diff easier, start using AES GCM
> library implementation instead of Crypto API.
> 
> Link: https://lore.kernel.org/all/20221103192259.2229-1-ardb@kernel.org
> CC: Ard Biesheuvel <ardb@...nel.org>
> Signed-off-by: Nikunj A Dadhania <nikunj@....com>

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

> ---
>   drivers/virt/coco/sev-guest/Kconfig     |   3 +-
>   drivers/virt/coco/sev-guest/sev-guest.c | 172 +++++++-----------------
>   drivers/virt/coco/sev-guest/sev-guest.h |   3 +
>   3 files changed, 53 insertions(+), 125 deletions(-)
>