KVM: PPC: Convert MSR to shared page
authorAlexander Graf <agraf@suse.de>
Thu, 29 Jul 2010 12:47:43 +0000 (14:47 +0200)
committerAvi Kivity <avi@redhat.com>
Sun, 24 Oct 2010 08:50:43 +0000 (10:50 +0200)
commit666e7252a15b7fc4a116e65deaf6da5e4ce660e3
treee7a56f03cb4e181eacd4f481fb3e6e038ad05b82
parent96bc451a153297bf1f99ef2d633d512ea349ae7a
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>
18 files changed:
arch/powerpc/include/asm/kvm_host.h
arch/powerpc/include/asm/kvm_para.h
arch/powerpc/kernel/asm-offsets.c
arch/powerpc/kvm/44x_tlb.c
arch/powerpc/kvm/book3s.c
arch/powerpc/kvm/book3s_32_mmu.c
arch/powerpc/kvm/book3s_32_mmu_host.c
arch/powerpc/kvm/book3s_64_mmu.c
arch/powerpc/kvm/book3s_64_mmu_host.c
arch/powerpc/kvm/book3s_emulate.c
arch/powerpc/kvm/book3s_paired_singles.c
arch/powerpc/kvm/booke.c
arch/powerpc/kvm/booke.h
arch/powerpc/kvm/booke_emulate.c
arch/powerpc/kvm/booke_interrupts.S
arch/powerpc/kvm/e500_tlb.c
arch/powerpc/kvm/e500_tlb.h
arch/powerpc/kvm/powerpc.c