Added ONE_REG interface for debug instruction

This patch adds the one_reg interface to get the special instruction
to be used for setting software breakpoint from userspace.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 6548445fd823..2d32ae4bc439 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -529,6 +529,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
                         val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]);
                         break;
 #endif /* CONFIG_ALTIVEC */
+                case KVM_REG_PPC_DEBUG_INST: {
+                        u32 opcode = INS_TW;
+                        r = copy_to_user((u32 __user *)(long)reg->addr,
+                                         &opcode, sizeof(u32));
+                        break;
+                }
                 default:
                         r = -EINVAL;
                         break;
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 58057d6f146d..a49a68a25c39 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1447,6 +1447,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
         case KVM_REG_PPC_TSR:
                 r = put_user(vcpu->arch.tsr, (u32 __user *)(long)reg->addr);
                 break;
+        case KVM_REG_PPC_DEBUG_INST: {
+                u32 opcode = KVMPPC_INST_EHPRIV;
+                r = copy_to_user((u32 __user *)(long)reg->addr,
+                                 &opcode, sizeof(u32));
+                break;
+        }
         default:
                 break;
         }