Re: [PATCH 0/5] x86: Impplement support for unaccepted memory

Andi Kleen
2021-08-12T19:33:30Z

On 8/12/2021 3:10 AM, Kirill A. Shutemov wrote:
> On Thu, Aug 12, 2021 at 10:23:24AM +0200, Joerg Roedel wrote:
>> Hi Kirill,
>>
>> On Tue, Aug 10, 2021 at 09:26:21AM +0300, Kirill A. Shutemov wrote:
>>> Accepting happens via a protocol specific for the Virtrual Machine
>>> platform.
>> That sentence bothers me a bit. Can you explain what it VMM specific in
>> the acceptance protocol?
> For TDX we have a signle MapGPA hypercall to VMM plus TDAcceptPage for
> every accepted page to TDX Module. SEV-SNP has to something similar.

I think Joerg's question was if TDX has a single ABI for all
hypervisors. The GHCI specification supports both hypervisor specific
and hypervisor agnostic calls. But these basic operations like MapGPA
are all hypervisor agnostic. The only differences would be in the
existing hypervisor specific PV code.

-Andi