| Message ID | 1371632965-20077-6-git-send-email-xiaoguangrong@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Il 19/06/2013 11:09, Xiao Guangrong ha scritto: > Document fast page fault to Documentation/virtual/kvm/mmu.txt > > Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.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 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. Paolo > - 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 > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 06/19/2013 08:13 PM, Paolo Bonzini wrote: > Il 19/06/2013 11:09, Xiao Guangrong ha scritto: >> Document fast page fault to Documentation/virtual/kvm/mmu.txt >> >> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.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 Nice. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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
Document fast page fault to Documentation/virtual/kvm/mmu.txt Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> --- Documentation/virtual/kvm/mmu.txt | 3 +++ 1 file changed, 3 insertions(+)