Re: [PATCH v11 018/113] KVM: TDX: create/destroy VM structure

[Sean Christopherson]

On Thu, Jan 26, 2023, Huang, Kai wrote:
> On Thu, 2023-01-26 at 21:59 +0000, Sean Christopherson wrote:
> > Hrm, but even if TDX takes a read-lock, there's still the problem of it needing
> > to walk the upper levels, i.e. KVM needs to keep mid-level page tables reachable
> > until they're fully removed.  Blech.  That should be a non-issue at this time
> > though, as I don't think KVM will ever REMOVE a page table of a live guest.  I
> > need to look at the PROMOTE/DEMOTE flows...
> 
> In this series, if I read correctly, when slot is removed/moved, private
> mappings are zapped too.  It's kinda buried in:
> 
> [PATCH v11 043/113] KVM: x86/tdp_mmu: Don't zap private pages for unsupported
> cases

That should be ok, only leaf SPTEs will be zapped in that case.