[PATCH 5/7] KVM: MMU: document fast page fault in

From: Xiao Guangrong
Date: Wed Jun 19 2013 - 05:11:33 EST

Document fast page fault to Documentation/virtual/kvm/mmu.txt

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Documentation/virtual/kvm/mmu.txt | 3 +++
1 file changed, 3 insertions(+)

diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
index 4fb442b..b5ce7dd 100644
--- a/Documentation/virtual/kvm/mmu.txt
+++ b/Documentation/virtual/kvm/mmu.txt
@@ -275,6 +275,9 @@ Handling a page fault is performed as follows:
information is stored and cache the information to vcpu->arch.mmio_gva,
vcpu->arch.access and vcpu->arch.mmio_gfn then call the emulator to emulate
the instruction who will get the benefit from the cached mmio info
+ - If both P bit and R/W bit of error code are set, there has a chance to
+ fast fix the page fault, please see the description of "Fast page fault" in
+ Documentation/virtual/kvm/locking.txt
- if needed, walk the guest page tables to determine the guest translation
(gva->gpa or ngpa->gpa)
- if permissions are insufficient, reflect the fault back to the guest

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