KVM: PPC: e500: Add support for TLBnPS registers

Add support for TLBnPS registers available in MMU Architecture Version
(MAV) 2.0.

Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

Documentation/virtual/kvm/api.txt

@@ -1803,6 +1803,10 @@ registers, find a list below:
   PPC   | KVM_REG_PPC_TLB1CFG	| 32
   PPC   | KVM_REG_PPC_TLB2CFG	| 32
   PPC   | KVM_REG_PPC_TLB3CFG	| 32
+  PPC   | KVM_REG_PPC_TLB0PS	| 32
+  PPC   | KVM_REG_PPC_TLB1PS	| 32
+  PPC   | KVM_REG_PPC_TLB2PS	| 32
+  PPC   | KVM_REG_PPC_TLB3PS	| 32
 
 ARM registers are mapped using the lower 32 bits.  The upper 16 of that
 is the register group type, or coprocessor number:

arch/powerpc/include/asm/kvm_host.h

@@ -502,6 +502,7 @@ struct kvm_vcpu_arch {
 	spinlock_t wdt_lock;
 	struct timer_list wdt_timer;
 	u32 tlbcfg[4];
+	u32 tlbps[4];
 	u32 mmucfg;
 	u32 epr;
 	u32 crit_save;

arch/powerpc/include/uapi/asm/kvm.h

@@ -465,5 +465,9 @@ struct kvm_get_htab_header {
 #define KVM_REG_PPC_TLB1CFG	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x94)
 #define KVM_REG_PPC_TLB2CFG	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x95)
 #define KVM_REG_PPC_TLB3CFG	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x96)
+#define KVM_REG_PPC_TLB0PS	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x97)
+#define KVM_REG_PPC_TLB1PS	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x98)
+#define KVM_REG_PPC_TLB2PS	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x99)
+#define KVM_REG_PPC_TLB3PS	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x9a)
 
 #endif /* __LINUX_KVM_POWERPC_H */

arch/powerpc/kvm/e500.h

@@ -23,6 +23,10 @@
 #include <asm/mmu-book3e.h>
 #include <asm/tlb.h>
 
+enum vcpu_ftr {
+	VCPU_FTR_MMU_V2
+};
+
 #define E500_PID_NUM   3
 #define E500_TLB_NUM   2
 
@@ -299,4 +303,18 @@ static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
 #define get_tlb_sts(gtlbe)              (MAS1_TS)
 #endif /* !BOOKE_HV */
 
+static inline bool has_feature(const struct kvm_vcpu *vcpu,
+			       enum vcpu_ftr ftr)
+{
+	bool has_ftr;
+	switch (ftr) {
+	case VCPU_FTR_MMU_V2:
+		has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
+		break;
+	default:
+		return false;
+	}
+	return has_ftr;
+}
+
 #endif /* KVM_E500_H */

arch/powerpc/kvm/e500_emulate.c

@@ -284,6 +284,16 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 	case SPRN_TLB1CFG:
 		*spr_val = vcpu->arch.tlbcfg[1];
 		break;
+	case SPRN_TLB0PS:
+		if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
+			return EMULATE_FAIL;
+		*spr_val = vcpu->arch.tlbps[0];
+		break;
+	case SPRN_TLB1PS:
+		if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
+			return EMULATE_FAIL;
+		*spr_val = vcpu->arch.tlbps[1];
+		break;
 	case SPRN_L1CSR0:
 		*spr_val = vcpu_e500->l1csr0;
 		break;

arch/powerpc/kvm/e500_mmu.c

@@ -631,6 +631,13 @@ int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 		i = id - KVM_REG_PPC_TLB0CFG;
 		*val = get_reg_val(id, vcpu->arch.tlbcfg[i]);
 		break;
+	case KVM_REG_PPC_TLB0PS:
+	case KVM_REG_PPC_TLB1PS:
+	case KVM_REG_PPC_TLB2PS:
+	case KVM_REG_PPC_TLB3PS:
+		i = id - KVM_REG_PPC_TLB0PS;
+		*val = get_reg_val(id, vcpu->arch.tlbps[i]);
+		break;
 	default:
 		r = -EINVAL;
 		break;
@@ -682,6 +689,16 @@ int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 			r = -EINVAL;
 		break;
 	}
+	case KVM_REG_PPC_TLB0PS:
+	case KVM_REG_PPC_TLB1PS:
+	case KVM_REG_PPC_TLB2PS:
+	case KVM_REG_PPC_TLB3PS: {
+		u32 reg = set_reg_val(id, *val);
+		i = id - KVM_REG_PPC_TLB0PS;
+		if (reg != vcpu->arch.tlbps[i])
+			r = -EINVAL;
+		break;
+	}
 	default:
 		r = -EINVAL;
 		break;
@@ -855,6 +872,11 @@ static int vcpu_mmu_init(struct kvm_vcpu *vcpu,
 	vcpu->arch.tlbcfg[1] |= params[1].entries;
 	vcpu->arch.tlbcfg[1] |= params[1].ways << TLBnCFG_ASSOC_SHIFT;
 
+	if (has_feature(vcpu, VCPU_FTR_MMU_V2)) {
+		vcpu->arch.tlbps[0] = mfspr(SPRN_TLB0PS);
+		vcpu->arch.tlbps[1] = mfspr(SPRN_TLB1PS);
+	}
+
 	return 0;
 }