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KVM: MMU: document fast page fault

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Document fast page fault 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 17:09:23 +08:00 committed by Gleb Natapov
parent 67652ed343
commit 2d49c47f35
1 changed files with 3 additions and 0 deletions
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Documentation/virtual/kvm/mmu.txt
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@ -277,6 +277,9 @@ Handling a page fault is performed as follows:
- walk shadow page table
- cache the information to vcpu->arch.mmio_gva, vcpu->arch.access and
vcpu->arch.mmio_gfn, and call the emulator
- If both P bit and R/W bit of error code are set, this could possibly
be handled as a "fast page fault" (fixed without taking the MMU lock). See
the description 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