linux-kernel - Re: [PATCH v11 11/20] x86/sev: Carve out and export SNP guest messaging init routines

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Message-ID: <83ff0326-a423-38f2-9a35-7cb1da77e649@amd.com>
Date: Fri, 13 Sep 2024 10:53:24 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Nikunj A Dadhania <nikunj@....com>, linux-kernel@...r.kernel.org,
 bp@...en8.de, x86@...nel.org, kvm@...r.kernel.org
Cc: mingo@...hat.com, tglx@...utronix.de, dave.hansen@...ux.intel.com,
 pgonda@...gle.com, seanjc@...gle.com, pbonzini@...hat.com
Subject: Re: [PATCH v11 11/20] x86/sev: Carve out and export SNP guest
 messaging init routines

On 7/31/24 10:08, Nikunj A Dadhania wrote:
> Currently, the SEV guest driver is the only user of SNP guest messaging.
> All routines for initializing SNP guest messaging are implemented within
> the SEV guest driver. To add Secure TSC guest support, these initialization
> routines need to be available during early boot.
> 
> Carve out common SNP guest messaging buffer allocations and message
> initialization routines to core/sev.c and export them. These newly added
> APIs set up the SNP message context (snp_msg_desc), which contains all the
> necessary details for sending SNP guest messages.
> 
> At present, the SEV guest platform data structure is used to pass the
> secrets page physical address to SEV guest driver. Since the secrets page
> address is locally available to the initialization routine, use the cached
> address. Remove the unused SEV guest platform data structure.
> 
> Signed-off-by: Nikunj A Dadhania <nikunj@....com>

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

> ---
>  arch/x86/include/asm/sev.h              |  71 ++++++++-
>  arch/x86/coco/sev/core.c                | 133 +++++++++++++++-
>  drivers/virt/coco/sev-guest/sev-guest.c | 194 +++---------------------
>  3 files changed, 213 insertions(+), 185 deletions(-)
>