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From: Lai Jiangshan on 7 May 2010 04:50

When don't use ->gfns when role.direct=1, update document for it.

Signed-off-by: Lai Jiangshan <laijs(a)cn.fujitsu.com>
Requested-by: Avi Kivity <avi(a)redhat.com>
---
diff --git a/Documentation/kvm/mmu.txt b/Documentation/kvm/mmu.txt
index da04671..aec19ae 100644
--- a/Documentation/kvm/mmu.txt
+++ b/Documentation/kvm/mmu.txt
@@ -178,7 +178,9 @@ 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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