On Mon, Jun 26, 2023, Mingwei Zhang wrote: > Add the description for tdp_mmu_page into kvm_mmu_page description. > tdp_mmu_page is a field to differentiate shadow pages from TDP MMU and > non-TDP MMU. When TDP MMU is enabled, sp->tdp_mmu_page=1 indicates a shadow > page for L1, while sp->tdp_mmu_page=0 indicates a shadow page for an L2. > When TDP MMU is disabled, sp->tdp_mmu_page is always 0. So update the doc > to reflect the information. > > Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx> > --- > Documentation/virt/kvm/x86/mmu.rst | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst > index cc4bd190c93d..678dc0260a54 100644 > --- a/Documentation/virt/kvm/x86/mmu.rst > +++ b/Documentation/virt/kvm/x86/mmu.rst > @@ -278,6 +278,8 @@ Shadow pages contain the following information: > since the last time the page table was actually used; if emulation > is triggered too frequently on this page, KVM will unmap the page > to avoid emulation in the future. > + tdp_mmu_page: > + Is 1 if the shadow page is a TDP MMU page. Maybe add a short blurb explaining that it's used for control flow when starting from a common entry point? E.g. walking page tables given a root, and walking lists that can hold both shadow MMU and TDP MMU pages.
