Re: [PATCH v2 00/28] Allow parallel MMU operations with TDP MMU

[Paolo Bonzini]

On 03/02/21 18:54, Sean Christopherson wrote:
> On Wed, Feb 03, 2021, Paolo Bonzini wrote:
> > Looks good!  I'll wait for a few days of reviews,
>
> I guess I know what I'm doing this afternoon :-)
>
> > but I'd like to queue this for 5.12 and I plan to make it the default in 5.13
> > or 5.12-rc (depending on when I can ask Red Hat QE to give it a shake).
>
> Hmm, given that kvm/queue doesn't seem to get widespread testing, I think it
> should be enabled by default in rc1 for whatever kernel it targets.
>
> Would it be too heinous to enable it by default in 5.12-rc1, knowing full well
> that there's a good possibility it would get reverted?

Absolutely not.  However, to clarify my plan:

- what is now kvm/queue and has been reviewed will graduate to kvm/next 
in a couple of days, and then to 5.12-rc1.  Ben's patches are already in 
kvm/queue, but there's no problem in waiting another week before moving 
them to kvm/next because it's not enabled by default.  (Right now even 
CET is in kvm/queue, but it will not move to kvm/next until bare metal 
support is in).

- if this will not have been tested by Red Hat QE by say 5.12-rc3, I 
would enable it in kvm/next instead, and at that point the target would 
become the 5.13 merge window (and release).

Paolo