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-rw-r--r--Documentation/kvm/mmu.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/kvm/mmu.txt b/Documentation/kvm/mmu.txt
index 0e872ae..2201dcb 100644
--- a/Documentation/kvm/mmu.txt
+++ b/Documentation/kvm/mmu.txt
@@ -180,7 +180,9 @@ Shadow pages contain the following information:
guest pages as leaves.
gfns:
An array of 512 guest frame numbers, one for each present pte. Used to
- perform a reverse map from a pte to a gfn.
+ perform a reverse map from a pte to a gfn. When role.direct is set, any
+ element of this array can be calculated from the gfn field when used, in
+ this case, the array of gfns is not allocated. See role.direct and gfn.
slot_bitmap:
A bitmap containing one bit per memory slot. If the page contains a pte
mapping a page from memory slot n, then bit n of slot_bitmap will be set
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