Re: [RFC PATCH 0/6] KVM: guest memory: Misc enhacnement

[Vishal Annapurve]

On Thu, Jun 15, 2023 at 1:12 PM <isaku.yamahata@xxxxxxxxx> wrote:
> ...
>
> * VM type: Now we have KVM_X86_PROTECTED_VM. How do we proceed?
>   - Keep KVM_X86_PROTECTED_VM for its use. Introduce KVM_X86_TDX_VM
>   - Use KVM_X86_PROTECTED_VM for TDX. (If necessary, introduce another type in
>     the future)
>   - any other way?

There are selftests posted[1] in context of this work, which rely on
KVM_X86_PROTECTED_VM being just the software-only psuedo-confidential
VMs. In future there might be more work to expand this usecase to
full-scale VMs. So it would be better to treat protected VMs as a
separate type which can be used on any platform without the need of
enabling TDX/SEV functionality.

TDX VM type can possibly serve as a specialized type of protected VM
with additional arch specific capabilities enabled.

[1] - https://github.com/sean-jc/linux/commits/x86/kvm_gmem_solo