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

From: Andi Kleen
Date: Thu Aug 12 2021 - 15:33:29 EST



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