KVM: PPC: bookehv: Add EPCR support in mtspr/mfspr emulation

Add EPCR support in booke mtspr/mfspr emulation. EPCR register is defined only
for 64-bit and HV categories, we will expose it at this point only to 64-bit
virtual processors running on 64-bit HV hosts.
Define a reusable setter function for vcpu's EPCR.

Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
[agraf: move HV dependency in the code]
Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 26 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 9457fb1b41c9..037d045db3f1 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1473,6 +1473,18 @@ void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
 {
 }
 
+void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr)
+{
+#if defined(CONFIG_64BIT)
+        vcpu->arch.epcr = new_epcr;
+#ifdef CONFIG_KVM_BOOKE_HV
+        vcpu->arch.shadow_epcr &= ~SPRN_EPCR_GICM;
+        if (vcpu->arch.epcr  & SPRN_EPCR_ICM)
+                vcpu->arch.shadow_epcr |= SPRN_EPCR_GICM;
+#endif
+#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 ba61974c1e20..e9b88e433f64 100644
--- a/arch/powerpc/kvm/booke.h
+++ b/arch/powerpc/kvm/booke.h
@@ -69,6 +69,7 @@ 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);
 
+void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr);
 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 514790f41aba..4685b8cf2249 100644
--- a/arch/powerpc/kvm/booke_emulate.c
+++ b/arch/powerpc/kvm/booke_emulate.c
@@ -240,7 +240,14 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
         case SPRN_MCSR:
                 vcpu->arch.mcsr &= ~spr_val;
                 break;
-
+#if defined(CONFIG_64BIT)
+        case SPRN_EPCR:
+                kvmppc_set_epcr(vcpu, spr_val);
+#ifdef CONFIG_KVM_BOOKE_HV
+                mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
+#endif
+                break;
+#endif
         default:
                 emulated = EMULATE_FAIL;
         }
@@ -335,6 +342,11 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
         case SPRN_MCSR:
                 *spr_val = vcpu->arch.mcsr;
                 break;
+#if defined(CONFIG_64BIT)
+        case SPRN_EPCR:
+                *spr_val = vcpu->arch.epcr;
+                break;
+#endif
 
         default:
                 emulated = EMULATE_FAIL;