On Sun, 2023-06-18 at 00:08 +0000, Mingwei Zhang wrote: > Add mmu_valid_gen into kvm_mmu_page description. mmu_valid_gen is used in > shadow MMU for fast zapping. Update the doc to reflect that. > > Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx> > --- > Documentation/virt/kvm/x86/mmu.rst | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst > index 3dce2426ad6d..0dbdb7fb8cc6 100644 > --- a/Documentation/virt/kvm/x86/mmu.rst > +++ b/Documentation/virt/kvm/x86/mmu.rst > @@ -208,6 +208,10 @@ Shadow pages contain the following information: > The page is not backed by a guest page table, but its first entry > points to one. This is set if NPT uses 5-level page tables (host > CR4.LA57=1) and is shadowing L1's 4-level NPT (L1 CR4.LA57=1). > + mmu_valid_gen: > + Used by comparing against kvm->arch.mmu_valid_gen to check whether the > + shadow page is obsolete thus a convenient variable for fast zapping. > + Note that TDP MMU does not use mmu_valid_gen. > gfn: > Either the guest page table containing the translations shadowed by this > page, or the base page frame for linear translations. See role.direct. Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
