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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2013-06-19 17:09:23 +0800 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-06-27 14:20:46 +0300 |
| commit | 2d49c47f350b939b395cd2d1abaa8c3bb6c54326 (patch) | |
| tree | 15619136c7a2c5e80c205590fa829b23cfa238b6 /Documentation/virtual/kvm | |
| parent | 67652ed34390b19ede6f847d23d8c68e2c819b50 (diff) | |
| download | linux-2d49c47f350b939b395cd2d1abaa8c3bb6c54326.tar.gz linux-2d49c47f350b939b395cd2d1abaa8c3bb6c54326.tar.bz2 linux-2d49c47f350b939b395cd2d1abaa8c3bb6c54326.zip | |
KVM: MMU: document fast page fault
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>
Diffstat (limited to 'Documentation/virtual/kvm')
| -rw-r--r-- | Documentation/virtual/kvm/mmu.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt index 0aa8e0e34119..42193f206602 100644 --- a/Documentation/virtual/kvm/mmu.txt +++ b/Documentation/virtual/kvm/mmu.txt @@ -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 |