[PATCH v2 6/6] KVM: Documentation: Add the missing description for tdp_mmu_page into kvm_mmu_page

[Mingwei Zhang <mizhang@xxxxxxxxxx>]

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.
 
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