Re: [RFC 09/14] KVM: x86/MMU: Only make pages available on Shadow MMU fault

[David Matlack]

On Wed, Dec 21, 2022 at 2:24 PM Ben Gardon <bgardon@xxxxxxxxxx> wrote:
>
> Now that the Shadow MMU has been factored out of mmu.c and the naming
> sheme has been cleaned up, it's clear that there's an unnecessary
> operation in direct_page_fault(). Since the MMU page quota is only
> applied to the Shadow MMU, there's no point to calling
> kvm_shadow_mmu_make_pages_available on a fault where the TDP MMU is
> going to handle installing new TDP PTEs.

Jinx! An equivalent change recently went into kvm/queue:

https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?h=queue&id=1290f90e77186bf8a06a3a35ebf254f5b004676b