[PATCH 3/6] KVM: Documentation: Add the missing ptep in kvm_mmu_page

[Mingwei Zhang <mizhang@google.com>]

Add the missing ptep in kvm_mmu_page description. ptep is used when TDP MMU
is enabled and it shares the storage with parent_ptes. Update the doc to
help readers to get up-to-date info.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
 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 149dd3cba48f..36bfe0fe02bb 100644
--- a/Documentation/virt/kvm/x86/mmu.rst
+++ b/Documentation/virt/kvm/x86/mmu.rst
@@ -236,6 +236,10 @@ Shadow pages contain the following information:
     parent_ptes points at this single spte, otherwise, there exists multiple
     sptes pointing at this page and (parent_ptes & ~0x1) points at a data
     structure with a list of parent sptes.
+  ptep:
+    Pointer to the parent spte when TDP MMU is enabled. In TDP MMU, each
+    shadow page will have at most one parent. Note that this field is a
+    union with parent_ptes.
   unsync:
     If true, then the translations in this page may not match the guest's
     translation.  This is equivalent to the state of the tlb when a pte is
-- 
2.41.0.162.gfafddb0af9-goog