[RFC PATCH 02/17] KVM: PPC64: booke: Add EPCR support in mtspr/mfspr emulation

[Mihai Caraman]

Add EPCR support in booke mtspr/mfspr emulation. EPCR register is defined
only for 64-bit and HV categories, so it shoud be available only on 64-bit
virtual processors. Undefine the support for 32-bit builds.
Define a reusable setter function for vcpu's EPCR.

Signed-off-by: Mihai Caraman <mihai.caraman at freescale.com>
---
 arch/powerpc/kvm/booke.c         |   12 +++++++++++-
 arch/powerpc/kvm/booke.h         |    6 ++++++
 arch/powerpc/kvm/booke_emulate.c |   13 ++++++++++++-
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 72f13f4..f9fa260 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -13,7 +13,7 @@
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  * Copyright IBM Corp. 2007
- * Copyright 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright 2010-2012 Freescale Semiconductor, Inc.
  *
  * Authors: Hollis Blanchard <hollisb at us.ibm.com>
  *          Christian Ehrhardt <ehrhardt at linux.vnet.ibm.com>
@@ -1243,6 +1243,16 @@ void kvmppc_core_commit_memory_region(struct kvm *kvm,
 {
 }
 
+#ifdef CONFIG_64BIT
+void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr)
+{
+	vcpu->arch.epcr = new_epcr;
+	vcpu->arch.shadow_epcr &= ~SPRN_EPCR_GICM;
+	if (vcpu->arch.epcr  & SPRN_EPCR_ICM)
+		vcpu->arch.shadow_epcr |= SPRN_EPCR_GICM;
+}
+#endif
+
 void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr)
 {
 	vcpu->arch.tcr = new_tcr;
diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h
index ba61974..e05b48f 100644
--- a/arch/powerpc/kvm/booke.h
+++ b/arch/powerpc/kvm/booke.h
@@ -69,6 +69,12 @@ extern unsigned long kvmppc_booke_handlers;
 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr);
 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr);
 
+#ifdef CONFIG_64BIT
+void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr);
+#else
+static inline void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr) {}
+#endif
+
 void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr);
 void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits);
 void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits);
diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c
index 6c76397..9cf2b95f 100644
--- a/arch/powerpc/kvm/booke_emulate.c
+++ b/arch/powerpc/kvm/booke_emulate.c
@@ -13,7 +13,7 @@
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  * Copyright IBM Corp. 2008
- * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011-2012 Freescale Semiconductor, Inc.
  *
  * Authors: Hollis Blanchard <hollisb at us.ibm.com>
  */
@@ -207,6 +207,12 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 	case SPRN_IVOR15:
 		vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = spr_val;
 		break;
+#ifdef CONFIG_64BIT
+	case SPRN_EPCR:
+		kvmppc_set_epcr(vcpu, spr_val);
+		mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
+		break;
+#endif
 
 	default:
 		emulated = EMULATE_FAIL;
@@ -293,6 +299,11 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 	case SPRN_IVOR15:
 		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
 		break;
+#ifdef CONFIG_64BIT
+	case SPRN_EPCR:
+		*spr_val = vcpu->arch.epcr;
+		break;
+#endif
 
 	default:
 		emulated = EMULATE_FAIL;
-- 
1.7.4.1