[PATCH 12/12] KVM: PPC: booke: Get/set guest EPCR register using ONE_REG interface

[Mihai Caraman]

Implement ONE_REG interface for EPCR register adding KVM_REG_PPC_EPCR to
the list of ONE_REG PPC supported registers.

Signed-off-by: Mihai Caraman <mihai.caraman at freescale.com>
---
 Documentation/virtual/kvm/api.txt |    1 +
 arch/powerpc/include/asm/kvm.h    |    2 ++
 arch/powerpc/kvm/booke.c          |   16 ++++++++++++++++
 3 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index e726d76..c78dff4 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1773,6 +1773,7 @@ registers, find a list below:
   PPC   | KVM_REG_PPC_VPA_ADDR  | 64
   PPC   | KVM_REG_PPC_VPA_SLB   | 128
   PPC   | KVM_REG_PPC_VPA_DTL   | 128
+  PPC   | KVM_REG_PPC_EPCR	| 32
 
 4.69 KVM_GET_ONE_REG
 
diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h
index b89ae4d..beb6b20 100644
--- a/arch/powerpc/include/asm/kvm.h
+++ b/arch/powerpc/include/asm/kvm.h
@@ -386,4 +386,6 @@ struct kvm_book3e_206_tlb_params {
 #define KVM_REG_PPC_VPA_SLB	(KVM_REG_PPC | KVM_REG_SIZE_U128 | 0x83)
 #define KVM_REG_PPC_VPA_DTL	(KVM_REG_PPC | KVM_REG_SIZE_U128 | 0x84)
 
+#define KVM_REG_PPC_EPCR	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x85)
+
 #endif /* __LINUX_KVM_POWERPC_H */
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index d396374..60b8237 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1395,6 +1395,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 				 &vcpu->arch.dbg_reg.dac[dac], sizeof(u64));
 		break;
 	}
+#if defined(CONFIG_64BIT) && defined(CONFIG_KVM_BOOKE_HV)
+	case KVM_REG_PPC_EPCR:
+		r = copy_to_user((u32 __user *)(long)reg->addr,
+				 &vcpu->arch.epcr, sizeof(u32));
+		break;
+#endif
 	default:
 		break;
 	}
@@ -1422,6 +1428,16 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 			     (u64 __user *)(long)reg->addr, sizeof(u64));
 		break;
 	}
+#if defined(CONFIG_64BIT) && defined(CONFIG_KVM_BOOKE_HV)
+	case KVM_REG_PPC_EPCR: {
+		u32 new_epcr;
+		r = copy_from_user(&new_epcr,
+			     (u32 __user *)(long)reg->addr, sizeof(u32));
+		if (r == 0)
+			kvmppc_set_epcr(vcpu, new_epcr);
+		break;
+	}
+#endif
 	default:
 		break;
 	}
-- 
1.7.4.1