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.
