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

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Message-Id: <1371632965-20077-6-git-send-email-xiaoguangrong@linux.vnet.ibm.com>
Date:	Wed, 19 Jun 2013 17:09:23 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	gleb@...hat.com
Cc:	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: [PATCH 5/7] KVM: MMU: document fast page fault in

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

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 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
-- 
1.8.1.4

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