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KVM: PPC: Convert SPRG[0-4] to shared page

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When in kernel mode there are 4 additional registers available that are
simple data storage. Instead of exiting to the hypervisor to read and
write those, we can just share them with the guest using the page.

This patch converts all users of the current field to the shared page.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2010-07-29 14:47:47 +02:00
committed by Avi Kivity
parent de7906c36c
commit a73a9599e0
5 changed files with 36 additions and 28 deletions
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24
arch/powerpc/kvm/emulate.c
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@ -263,13 +263,17 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
kvmppc_set_gpr(vcpu, rt, get_tb()); break;
case SPRN_SPRG0:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg0); break;
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg0);
break;
case SPRN_SPRG1:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg1); break;
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg1);
break;
case SPRN_SPRG2:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg2); break;
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg2);
break;
case SPRN_SPRG3:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg3); break;
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg3);
break;
/* Note: SPRG4-7 are user-readable, so we don't get
* a trap. */
@ -341,13 +345,17 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
break;
case SPRN_SPRG0:
vcpu->arch.sprg0 = kvmppc_get_gpr(vcpu, rs); break;
vcpu->arch.shared->sprg0 = kvmppc_get_gpr(vcpu, rs);
break;
case SPRN_SPRG1:
vcpu->arch.sprg1 = kvmppc_get_gpr(vcpu, rs); break;
vcpu->arch.shared->sprg1 = kvmppc_get_gpr(vcpu, rs);
break;
case SPRN_SPRG2:
vcpu->arch.sprg2 = kvmppc_get_gpr(vcpu, rs); break;
vcpu->arch.shared->sprg2 = kvmppc_get_gpr(vcpu, rs);
break;
case SPRN_SPRG3:
vcpu->arch.sprg3 = kvmppc_get_gpr(vcpu, rs); break;
vcpu->arch.shared->sprg3 = kvmppc_get_gpr(vcpu, rs);
break;
default:
emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);