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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2013-06-19 17:09:20 +0800
committerGleb Natapov <gleb@redhat.com>2013-06-27 14:20:42 +0300
commitaccaefe07ddbeb12c0de4cec1d62dba6a0ea1605 (patch)
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KVM: MMU: document clear_spte_count
Document it to Documentation/virtual/kvm/mmu.txt Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/mmu.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
index 869abcc48315..f514a3fad9b9 100644
--- a/Documentation/virtual/kvm/mmu.txt
+++ b/Documentation/virtual/kvm/mmu.txt
@@ -210,6 +210,11 @@ Shadow pages contain the following information:
A bitmap indicating which sptes in spt point (directly or indirectly) at
pages that may be unsynchronized. Used to quickly locate all unsychronized
pages reachable from a given page.
+ clear_spte_count:
+ Only present on 32-bit hosts, where a 64-bit spte cannot be written
+ atomically. The reader uses this while running out of the MMU lock
+ to detect in-progress updates and retry them until the writer has
+ finished the write.
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