Re: [PATCH 03/22] kvm: mmu: Init / Uninit the TDP MMU

[Ben Gardon]

On Wed, Sep 30, 2020 at 10:39 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
> On 30/09/20 18:57, Sean Christopherson wrote:
> >> +
> >> +static bool __read_mostly tdp_mmu_enabled = true;
> >> +module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644);
> > This param should not exist until the TDP MMU is fully functional, e.g. running
> > KVM against "kvm: mmu: Support zapping SPTEs in the TDP MMU" immediately hits a
> > BUG() in the rmap code.  I haven't wrapped my head around the entire series to
> > grok whether it make sense to incrementally enable the TDP MMU, but my gut says
> > that's probably non-sensical.
>
> No, it doesn't.  Whether to add the module parameter is kind of
> secondary, but I agree it shouldn't be true---not even at the end of
> this series, since fast page fault for example is not implemented yet.
>
> Paolo
>
I fully agree, sorry about that. I should have at least defaulted the
module parameter to false before sending the series out. I'll remedy
that in the next patch set. (Unless you beat me to it, Paolo)