Re: [PATCH v3 2/3] KVM: x86: Handle the case of 5-level shadow page table

[Sean Christopherson]

The shortlog is very misleading.  KVM already supports 5-level paging for
traditional shadow paging.  This is specifically for shadowing nNPT, and it's
specifically for shadow everything _except_ 5-level nNPT.  Something like:

KVM: x86/mmu: Support shadowing nNPT when 5-level paging is enabled in host


On Wed, Aug 18, 2021, Wei Huang wrote:
> When the 5-level page table CPU flag is exposed, KVM code needs to handle
> this case by pointing mmu->root_hpa to a properly-constructed 5-level page
> table.

Similarly, this is wrong, or maybe just poorly worded.  This has nothing to do
with LA57 being exposed to the guest, it's purely the host using 5-level paging
and NPT being enabled and exposed to L1.