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

Kirill A. Shutemov
2021-08-12T20:22:48Z

On Thu, Aug 12, 2021 at 12:33:11PM -0700, Andi Kleen wrote:
>
> 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.

My point was that TDX and SEV-SNP going to be different and we need a way
to hook the right protocol for each.

--
Kirill A. Shutemov