[PATCH 3/4] KVM: PPC: booke: Added DECAR support

[Alexander Graf <agraf@xxxxxxx>]

From: Bharat Bhushan <r65777@xxxxxxxxxxxxx>

Added the decrementer auto-reload support. DECAR is readable
on e500v2/e500mc and later cpus.

Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
Signed-off-by: Alexander Graf <agraf@xxxxxxx>
---
 arch/powerpc/include/asm/kvm_host.h |    2 ++
 arch/powerpc/kvm/booke.c            |    5 +++++
 arch/powerpc/kvm/booke_emulate.c    |    3 +++
 arch/powerpc/kvm/e500_emulate.c     |    3 +++
 4 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index dd783be..50ea12f 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -418,7 +418,9 @@ struct kvm_vcpu_arch {
 	ulong mcsrr1;
 	ulong mcsr;
 	u32 dec;
+#ifdef CONFIG_BOOKE
 	u32 decar;
+#endif
 	u32 tbl;
 	u32 tbu;
 	u32 tcr;
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 72f13f4..86681ee 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1267,6 +1267,11 @@ void kvmppc_decrementer_func(unsigned long data)
 {
 	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 
+	if (vcpu->arch.tcr & TCR_ARE) {
+		vcpu->arch.dec = vcpu->arch.decar;
+		kvmppc_emulate_dec(vcpu);
+	}
+
 	kvmppc_set_tsr_bits(vcpu, TSR_DIS);
 }
 
diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c
index 6c76397..9eb9809 100644
--- a/arch/powerpc/kvm/booke_emulate.c
+++ b/arch/powerpc/kvm/booke_emulate.c
@@ -129,6 +129,9 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 		kvmppc_set_tcr(vcpu, spr_val);
 		break;
 
+	case SPRN_DECAR:
+		vcpu->arch.decar = spr_val;
+		break;
 	/*
 	 * Note: SPRG4-7 are user-readable.
 	 * These values are loaded into the real SPRGs when resuming the
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index 8b99e07..e04b0ef 100644
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -269,6 +269,9 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 		*spr_val = vcpu->arch.shared->mas7_3 >> 32;
 		break;
 #endif
+	case SPRN_DECAR:
+		*spr_val = vcpu->arch.decar;
+		break;
 	case SPRN_TLB0CFG:
 		*spr_val = vcpu->arch.tlbcfg[0];
 		break;
-- 
1.6.0.2

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