booke: Added ONE_REG interface for IAC/DAC debug registers

IAC/DAC are defined as 32 bit while they are 64 bit wide. So ONE_REG
interface is added to set/get them.
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/kvm.h

@@ -221,6 +221,12 @@ struct kvm_sregs {
 
 			__u32 dbsr;	/* KVM_SREGS_E_UPDATE_DBSR */
 			__u32 dbcr[3];
+			/*
+			 * iac/dac registers are 64bit wide, while this API
+			 * interface provides only lower 32 bits on 64 bit
+			 * processors. ONE_REG interface is added for 64bit
+			 * iac/dac registers.
+			 */
 			__u32 iac[4];
 			__u32 dac[2];
 			__u32 dvc[2];
@@ -326,5 +332,11 @@ struct kvm_book3e_206_tlb_params {
 };
 
 #define KVM_REG_PPC_HIOR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x1)
+#define KVM_REG_PPC_IAC1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x2)
+#define KVM_REG_PPC_IAC2	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x3)
+#define KVM_REG_PPC_IAC3	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x4)
+#define KVM_REG_PPC_IAC4	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x5)
+#define KVM_REG_PPC_DAC1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x6)
+#define KVM_REG_PPC_DAC2	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x7)
 
 #endif /* __LINUX_KVM_POWERPC_H */

arch/powerpc/include/asm/kvm_host.h

@@ -346,6 +346,27 @@ struct kvmppc_slb {
 	bool class	: 1;
 };
 
+# ifdef CONFIG_PPC_FSL_BOOK3E
+#define KVMPPC_BOOKE_IAC_NUM	2
+#define KVMPPC_BOOKE_DAC_NUM	2
+# else
+#define KVMPPC_BOOKE_IAC_NUM	4
+#define KVMPPC_BOOKE_DAC_NUM	2
+# endif
+#define KVMPPC_BOOKE_MAX_IAC	4
+#define KVMPPC_BOOKE_MAX_DAC	2
+
+struct kvmppc_booke_debug_reg {
+	u32 dbcr0;
+	u32 dbcr1;
+	u32 dbcr2;
+#ifdef CONFIG_KVM_E500MC
+	u32 dbcr4;
+#endif
+	u64 iac[KVMPPC_BOOKE_MAX_IAC];
+	u64 dac[KVMPPC_BOOKE_MAX_DAC];
+};
+
 struct kvm_vcpu_arch {
 	ulong host_stack;
 	u32 host_pid;
@@ -440,8 +461,6 @@ struct kvm_vcpu_arch {
 
 	u32 ccr0;
 	u32 ccr1;
-	u32 dbcr0;
-	u32 dbcr1;
 	u32 dbsr;
 
 	u64 mmcr[3];
@@ -476,6 +495,7 @@ struct kvm_vcpu_arch {
 	u32 tlbcfg[4];
 	u32 mmucfg;
 	u32 epr;
+	struct kvmppc_booke_debug_reg dbg_reg;
 #endif
 	gpa_t paddr_accessed;
 	gva_t vaddr_accessed;

arch/powerpc/kvm/booke.c

@@ -1351,12 +1351,56 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 
 int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 {
-	return -EINVAL;
+	int r = -EINVAL;
+
+	switch (reg->id) {
+	case KVM_REG_PPC_IAC1:
+	case KVM_REG_PPC_IAC2:
+	case KVM_REG_PPC_IAC3:
+	case KVM_REG_PPC_IAC4: {
+		int iac = reg->id - KVM_REG_PPC_IAC1;
+		r = copy_to_user((u64 __user *)(long)reg->addr,
+				 &vcpu->arch.dbg_reg.iac[iac], sizeof(u64));
+		break;
+	}
+	case KVM_REG_PPC_DAC1:
+	case KVM_REG_PPC_DAC2: {
+		int dac = reg->id - KVM_REG_PPC_DAC1;
+		r = copy_to_user((u64 __user *)(long)reg->addr,
+				 &vcpu->arch.dbg_reg.dac[dac], sizeof(u64));
+		break;
+	}
+	default:
+		break;
+	}
+	return r;
 }
 
 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 {
-	return -EINVAL;
+	int r = -EINVAL;
+
+	switch (reg->id) {
+	case KVM_REG_PPC_IAC1:
+	case KVM_REG_PPC_IAC2:
+	case KVM_REG_PPC_IAC3:
+	case KVM_REG_PPC_IAC4: {
+		int iac = reg->id - KVM_REG_PPC_IAC1;
+		r = copy_from_user(&vcpu->arch.dbg_reg.iac[iac],
+			     (u64 __user *)(long)reg->addr, sizeof(u64));
+		break;
+	}
+	case KVM_REG_PPC_DAC1:
+	case KVM_REG_PPC_DAC2: {
+		int dac = reg->id - KVM_REG_PPC_DAC1;
+		r = copy_from_user(&vcpu->arch.dbg_reg.dac[dac],
+			     (u64 __user *)(long)reg->addr, sizeof(u64));
+		break;
+	}
+	default:
+		break;
+	}
+	return r;
 }
 
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)

arch/powerpc/kvm/booke_emulate.c

@@ -133,10 +133,10 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 		vcpu->arch.csrr1 = spr_val;
 		break;
 	case SPRN_DBCR0:
-		vcpu->arch.dbcr0 = spr_val;
+		vcpu->arch.dbg_reg.dbcr0 = spr_val;
 		break;
 	case SPRN_DBCR1:
-		vcpu->arch.dbcr1 = spr_val;
+		vcpu->arch.dbg_reg.dbcr1 = spr_val;
 		break;
 	case SPRN_DBSR:
 		vcpu->arch.dbsr &= ~spr_val;
@@ -266,10 +266,10 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 		*spr_val = vcpu->arch.csrr1;
 		break;
 	case SPRN_DBCR0:
-		*spr_val = vcpu->arch.dbcr0;
+		*spr_val = vcpu->arch.dbg_reg.dbcr0;
 		break;
 	case SPRN_DBCR1:
-		*spr_val = vcpu->arch.dbcr1;
+		*spr_val = vcpu->arch.dbg_reg.dbcr1;
 		break;
 	case SPRN_DBSR:
 		*spr_val = vcpu->arch.dbsr;