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Commit 2d49c47f authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Gleb Natapov
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KVM: MMU: document fast page fault 



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

Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 67652ed3

Documentation/virtual/kvm/mmu.txt

+3 −0
Original line number Diff line number Diff line
@@ -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