Re: SVSM draft specification v0.62 / GHCB draft specification v2.03

[Tom Lendacky <thomas.lendacky@amd.com>]

On 3/16/23 16:12, Tom Lendacky wrote:
> On 3/16/23 15:31, Tom Dohrmann wrote:
>> On Tue, Mar 14, 2023 at 05:08:17PM -0500, Tom Lendacky wrote:
>>> Attached is an updated draft version of the SVSM specification with 
>>> feedback
>>> incorporated from the previous review.
>>>
>>> Also attached is a draft GHCB specification with updates for APIC ID
>>> retrieval and VMPL/VMSA level execution (and an SEV-ES enhancement to use
>>> the SNP Page State Change support for working with UPM).
>>
>> AFAICT the new GHCB spec explains how to run a vCPU at another VMPL,
>> but doesn't contain any information about how to registers a new VMSA
>> for a specific VMPL. From looking at some of the patches used for SVSM
>> it seems that a new field in the AP Creation NAE was added, but the
>> specification wasn't yet updated accordingly.
> 
> Ah, you are correct. I missed pulling that change into this version of the 
> document. Thanks for pointing that out.

And just as an FYI until the next draft, bit positions 16-19 of 
SW_EXITINFO1 on the AP Create NAE event will indicate the VMPL for which 
the VMSA is being created/deleted.

Thanks,
Tom

> 
> Thanks,
> Tom
> 
>>
>> Regards,
>> Tom
>>
>>> Please take a look and reply with any feedback you may have.
>>>
>>> Thanks,
>>> Tom
>>
>>
>>