linux-kernel - Re: [PATCH v2 03/14] x86/sev: Check for the presence of an SVSM in the SNP Secrets page

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Date: Mon, 11 Mar 2024 09:50:29 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Dionna Amalie Glaze <dionnaglaze@...gle.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>,
 Dan Williams <dan.j.williams@...el.com>, Michael Roth
 <michael.roth@....com>, Ashish Kalra <ashish.kalra@....com>
Subject: Re: [PATCH v2 03/14] x86/sev: Check for the presence of an SVSM in
 the SNP Secrets page

On 3/8/24 18:33, Dionna Amalie Glaze wrote:
> On Fri, Mar 8, 2024 at 10:36 AM Tom Lendacky <thomas.lendacky@....com> wrote:
>>
>> During early boot phases, check for the presence of an SVSM when running
>> as an SEV-SNP guest.
>>
>> An SVSM is present if the 64-bit value at offset 0x148 into the secrets
>> page is non-zero. If an SVSM is present, save the SVSM Calling Area
>> address (CAA), located at offset 0x150 into the secrets page, and set
>> the VMPL level of the guest, which should be non-zero, to indicate the
>> presence of an SVSM.
>>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
>> ---
>>   arch/x86/boot/compressed/sev.c    | 35 ++++++++---------
>>   arch/x86/include/asm/sev-common.h |  4 ++
>>   arch/x86/include/asm/sev.h        | 25 +++++++++++-
>>   arch/x86/kernel/sev-shared.c      | 64 +++++++++++++++++++++++++++++++
>>   arch/x86/kernel/sev.c             | 16 ++++++++
>>   5 files changed, 125 insertions(+), 19 deletions(-)
>>

>> +
>> +/*
>> + * Maintain the GPA of the SVSM Calling Area (CA) in order to utilize the SVSM
>> + * services needed when not runnuing in VMPL0.
> 
> running*
> 
> otherwise lgtm

Will fix.

Thanks,
Tom

>