[pve-devel] applied: Re: [PATCH qemu] drop patch force-disabling smm

[Thomas Lamprecht]

On 24/08/2021 11:24, Wolfgang Bumiller wrote:
> On Tue, Aug 24, 2021 at 11:19:52AM +0200, Thomas Lamprecht wrote:
>> On 24/08/2021 10:52, Stefan Reiter wrote:
>>> I've tested live-migration in both directions (with patch <-> current),
>>> Linux and Windows guests on a nested setup (but SMM is emulated in QEMU
>>> so nested shouldn't matter AFAIU). All worked without issue.
>>>
>>> I'm not sure if there is something specific a guest would need to do to
>>> exercise SMM support, but since we're turning it on, not off, I'm pretty
>>> sure that at least forward migration should always work.
>>
>> sounds sensible
> 
> I think this mostly happens on boot, so perhaps migrating to a patched
> qemu, *soft*-rebooting the guest and then migrating back might be a
> problem.
> 

But the backmigration from new -> old is not supported by us anyway, so even if
that would cause a problem it's a non issue.