Add the description for 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>
Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
---
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 97d695207e11..cc4bd190c93d 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+ shadow page is obsolete thus a convenient variable for fast zapping.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.
--
2.41.0.162.gfafddb0af9-goog
