KVM: PPC: BOOK3S: PR: Emulate virtual timebase register

virtual time base register is a per VM, per cpu register that needs
to be saved and restored on vm exit and entry. Writing to VTB is not
allowed in the privileged mode.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[agraf: fix compile error]
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index c254c27f240e..ddce1ea8ac4a 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -646,6 +646,9 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
                 case KVM_REG_PPC_BESCR:
                         val = get_reg_val(reg->id, vcpu->arch.bescr);
                         break;
+                case KVM_REG_PPC_VTB:
+                        val = get_reg_val(reg->id, vcpu->arch.vtb);
+                        break;
                 default:
                         r = -EINVAL;
                         break;
@@ -750,6 +753,9 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
                 case KVM_REG_PPC_BESCR:
                         vcpu->arch.bescr = set_reg_val(reg->id, val);
                         break;
+                case KVM_REG_PPC_VTB:
+                        vcpu->arch.vtb = set_reg_val(reg->id, val);
+                        break;
                 default:
                         r = -EINVAL;
                         break;