[PATCH 1/7] KVM: MMU: update the documentation for reverse mapping of parent_pte

From: Xiao Guangrong
Date: Wed Jun 19 2013 - 05:12:53 EST

Update the document to match the current reverse mapping of

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Documentation/virtual/kvm/mmu.txt | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
index 43fcb76..869abcc 100644
--- a/Documentation/virtual/kvm/mmu.txt
+++ b/Documentation/virtual/kvm/mmu.txt
@@ -191,12 +191,12 @@ Shadow pages contain the following information:
A counter keeping track of how many hardware registers (guest cr3 or
pdptrs) are now pointing at the page. While this counter is nonzero, the
page cannot be destroyed. See role.invalid.
- multimapped:
- Whether there exist multiple sptes pointing at this page.
- parent_pte/parent_ptes:
- If multimapped is zero, parent_pte points at the single spte that points at
- this page's spt. Otherwise, parent_ptes points at a data structure
- with a list of parent_ptes.
+ parent_ptes:
+ The reverse mapping for the pte/ptes pointing at this page's spt. If
+ parent_ptes bit 0 is zero, only one spte points at this pages and
+ 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_ptes.
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

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