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KVM: MMU: document clear_spte_count

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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>
This commit is contained in:
Xiao Guangrong
2013-06-19 17:09:20 +08:00
committed by Gleb Natapov
parent a8eca9dcc6
commit accaefe07d
3 changed files with 23 additions and 3 deletions
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Documentation/virtual/kvm/mmu.txt
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@@ -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.
Reverse map
===========