diff options
| author |   Alexander Graf <agraf@suse.de> | 2010-07-29 14:47:43 +0200 |
|---|---|---|
| committer |   Avi Kivity <avi@redhat.com> | 2010-10-24 10:50:43 +0200 |
| commit | 666e7252a15b7fc4a116e65deaf6da5e4ce660e3 (patch) | |
| tree | e7a56f03cb4e181eacd4f481fb3e6e038ad05b82 /arch/powerpc/kvm/booke_interrupts.S | |
| parent | KVM: PPC: Introduce shared page (diff) | |
| download | linux-dev-666e7252a15b7fc4a116e65deaf6da5e4ce660e3.tar.xz linux-dev-666e7252a15b7fc4a116e65deaf6da5e4ce660e3.zip | |
KVM: PPC: Convert MSR to shared page
One of the most obvious registers to share with the guest directly is the
MSR. The MSR contains the "interrupts enabled" flag which the guest has to
toggle in critical sections.
So in order to bring the overhead of interrupt en- and disabling down, let's
put msr into the shared page. Keep in mind that even though you can fully read
its contents, writing to it doesn't always update all state. There are a few
safe fields that don't require hypervisor interaction. See the documentation
for a list of MSR bits that are safe to be set from inside the guest.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/booke_interrupts.S')
| -rw-r--r-- | arch/powerpc/kvm/booke_interrupts.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S index 380a78cf484d..049846911ce4 100644 --- a/arch/powerpc/kvm/booke_interrupts.S +++ b/arch/powerpc/kvm/booke_interrupts.S @@ -415,7 +415,8 @@ lightweight_exit: lwz r8, VCPU_GPR(r8)(r4) lwz r3, VCPU_PC(r4) mtsrr0 r3 - lwz r3, VCPU_MSR(r4) + lwz r3, VCPU_SHARED(r4) + lwz r3, VCPU_SHARED_MSR(r3) oris r3, r3, KVMPPC_MSR_MASK@h ori r3, r3, KVMPPC_MSR_MASK@l mtsrr1 r3 |