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

On 8/12/2021 3:10 AM, Kirill A. Shutemov wrote:

On Thu, Aug 12, 2021 at 10:23:24AM +0200, Joerg Roedel wrote:

quoted

Hi Kirill,

On Tue, Aug 10, 2021 at 09:26:21AM +0300, Kirill A. Shutemov wrote:

quoted

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