From 666e7252a15b7fc4a116e65deaf6da5e4ce660e3 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 29 Jul 2010 14:47:43 +0200 Subject: 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 Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/powerpc/kvm/e500_tlb.c') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 21011e1..092a390 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -314,10 +314,10 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, | MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID; stlbe->mas2 = (gvaddr & MAS2_EPN) | e500_shadow_mas2_attrib(gtlbe->mas2, - vcpu_e500->vcpu.arch.msr & MSR_PR); + vcpu_e500->vcpu.arch.shared->msr & MSR_PR); stlbe->mas3 = (hpaddr & MAS3_RPN) | e500_shadow_mas3_attrib(gtlbe->mas3, - vcpu_e500->vcpu.arch.msr & MSR_PR); + vcpu_e500->vcpu.arch.shared->msr & MSR_PR); stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN; trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2, @@ -576,28 +576,28 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr) { - unsigned int as = !!(vcpu->arch.msr & MSR_IS); + unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS); return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as); } int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr) { - unsigned int as = !!(vcpu->arch.msr & MSR_DS); + unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS); return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as); } void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu) { - unsigned int as = !!(vcpu->arch.msr & MSR_IS); + unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS); kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as); } void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu) { - unsigned int as = !!(vcpu->arch.msr & MSR_DS); + unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS); kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as); } -- cgit v1.1