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authorAlexander Graf <agraf@suse.de>2010-07-29 08:47:43 -0400
committerAvi Kivity <avi@redhat.com>2010-10-24 04:50:43 -0400
commit666e7252a15b7fc4a116e65deaf6da5e4ce660e3 (patch)
treee7a56f03cb4e181eacd4f481fb3e6e038ad05b82 /arch/powerpc/include/asm/kvm_para.h
parent96bc451a153297bf1f99ef2d633d512ea349ae7a (diff)
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/include/asm/kvm_para.h')
-rw-r--r--arch/powerpc/include/asm/kvm_para.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h
index 1485ba87a52a..a17dc5229d99 100644
--- a/arch/powerpc/include/asm/kvm_para.h
+++ b/arch/powerpc/include/asm/kvm_para.h
@@ -23,6 +23,7 @@
23#include <linux/types.h> 23#include <linux/types.h>
24 24
25struct kvm_vcpu_arch_shared { 25struct kvm_vcpu_arch_shared {
26 __u64 msr;
26}; 27};
27 28
28#ifdef __KERNEL__ 29#ifdef __KERNEL__