Re: [PATCH v2 0/9] Move initializing SEV/SNP functionality to KVM

["Kalra, Ashish" <ashish.kalra@amd.com>]

On 12/17/2024 10:00 AM, Dionna Amalie Glaze wrote:
> On Mon, Dec 16, 2024 at 3:57 PM Ashish Kalra <Ashish.Kalra@amd.com> wrote:
>>
>> From: Ashish Kalra <ashish.kalra@amd.com>
> 
>> The on-demand SEV initialization support requires a fix in QEMU to
>> remove check for SEV initialization to be done prior to launching
>> SEV/SEV-ES VMs.
>> NOTE: With the above fix for QEMU, older QEMU versions will be broken
>> with respect to launching SEV/SEV-ES VMs with the newer kernel/KVM as
>> older QEMU versions require SEV initialization to be done before
>> launching SEV/SEV-ES VMs.
>>
> 
> I don't think this is okay. I think you need to introduce a KVM
> capability to switch over to the new way of initializing SEV VMs and
> deprecate the old way so it doesn't need to be supported for any new
> additions to the interface.
> 

But that means KVM will need to support both mechanisms of doing SEV initialization - during KVM module load time 
and the deferred/lazy (on-demand) SEV INIT during VM launch.

Thanks,
Ashish