Re: [PATCH 04/22] KVM: x86/mmu: Skip emulation on page fault iff 1+ SPs were unprotected

[Sean Christopherson]

On Fri, Aug 23, 2024, Sean Christopherson wrote:
> On Thu, Aug 22, 2024, Sean Christopherson wrote:
> Intel support is especially misleading, because sharing page tables between EPT
> and IA32 is rather nonsensical due to them having different formats.  I.e. I doubt
> Paolo had a use case for the VMX changes, and was just providing parity with SVM.
> Of course, reusing L1's page tables as the NPT tables for L2 is quite crazy too,

Actually, it's not _that_ crazy, e.g. KVM s390 does this for last-level page tables
so that changes to the host userspace mappings don't require mmu_notifier-induced
changes in KVM.

> but at least the PTE formats are identical.