arch/powerpc/kvm/e500_tlb.h

   1 /*
   2  * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: Yu Liu, yu.liu@freescale.com
   5  *
   6  * Description:
   7  * This file is based on arch/powerpc/kvm/44x_tlb.h,
   8  * by Hollis Blanchard <hollisb@us.ibm.com>.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License, version 2, as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #ifndef __KVM_E500_TLB_H__
  16 #define __KVM_E500_TLB_H__
  17
  18 #include <linux/kvm_host.h>
  19 #include <asm/mmu-book3e.h>
  20 #include <asm/tlb.h>
  21 #include <asm/kvm_e500.h>
  22
  23 #define KVM_E500_TLB0_WAY_SIZE_BIT      7       /* Fixed */
  24 #define KVM_E500_TLB0_WAY_SIZE          (1UL << KVM_E500_TLB0_WAY_SIZE_BIT)
  25 #define KVM_E500_TLB0_WAY_SIZE_MASK     (KVM_E500_TLB0_WAY_SIZE - 1)
  26
  27 #define KVM_E500_TLB0_WAY_NUM_BIT       1       /* No greater than 7 */
  28 #define KVM_E500_TLB0_WAY_NUM           (1UL << KVM_E500_TLB0_WAY_NUM_BIT)
  29 #define KVM_E500_TLB0_WAY_NUM_MASK      (KVM_E500_TLB0_WAY_NUM - 1)
  30
  31 #define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
  32 #define KVM_E500_TLB1_SIZE  16
  33
  34 #define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
  35 #define tlbsel_of(index)        ((index) >> 16)
  36 #define esel_of(index)          ((index) & 0xFFFF)
  37
  38 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
  39 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
  40 #define MAS2_ATTRIB_MASK \
  41           (MAS2_X0 | MAS2_X1)
  42 #define MAS3_ATTRIB_MASK \
  43           (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
  44            | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
  45
  46 extern void kvmppc_dump_tlbs(struct kvm_vcpu *);
  47 extern int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *, ulong);
  48 extern int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *);
  49 extern int kvmppc_e500_emul_tlbre(struct kvm_vcpu *);
  50 extern int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *, int, int);
  51 extern int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *, int);
  52 extern int kvmppc_e500_tlb_search(struct kvm_vcpu *, gva_t, unsigned int, int);
  53 extern void kvmppc_e500_tlb_put(struct kvm_vcpu *);
  54 extern void kvmppc_e500_tlb_load(struct kvm_vcpu *, int);
  55 extern int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *);
  56 extern void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *);
  57 extern void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *);
  58
  59 /* TLB helper functions */
  60 static inline unsigned int get_tlb_size(const struct tlbe *tlbe)
  61 {
  62         return (tlbe->mas1 >> 7) & 0x1f;
  63 }
  64
  65 static inline gva_t get_tlb_eaddr(const struct tlbe *tlbe)
  66 {
  67         return tlbe->mas2 & 0xfffff000;
  68 }
  69
  70 static inline u64 get_tlb_bytes(const struct tlbe *tlbe)
  71 {
  72         unsigned int pgsize = get_tlb_size(tlbe);
  73         return 1ULL << 10 << pgsize;
  74 }
  75
  76 static inline gva_t get_tlb_end(const struct tlbe *tlbe)
  77 {
  78         u64 bytes = get_tlb_bytes(tlbe);
  79         return get_tlb_eaddr(tlbe) + bytes - 1;
  80 }
  81
  82 static inline u64 get_tlb_raddr(const struct tlbe *tlbe)
  83 {
  84         u64 rpn = tlbe->mas7;
  85         return (rpn << 32) | (tlbe->mas3 & 0xfffff000);
  86 }
  87
  88 static inline unsigned int get_tlb_tid(const struct tlbe *tlbe)
  89 {
  90         return (tlbe->mas1 >> 16) & 0xff;
  91 }
  92
  93 static inline unsigned int get_tlb_ts(const struct tlbe *tlbe)
  94 {
  95         return (tlbe->mas1 >> 12) & 0x1;
  96 }
  97
  98 static inline unsigned int get_tlb_v(const struct tlbe *tlbe)
  99 {
 100         return (tlbe->mas1 >> 31) & 0x1;
 101 }
 102
 103 static inline unsigned int get_tlb_iprot(const struct tlbe *tlbe)
 104 {
 105         return (tlbe->mas1 >> 30) & 0x1;
 106 }
 107
 108 static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
 109 {
 110         return vcpu->arch.pid & 0xff;
 111 }
 112
 113 static inline unsigned int get_cur_spid(
 114                 const struct kvmppc_vcpu_e500 *vcpu_e500)
 115 {
 116         return (vcpu_e500->mas6 >> 16) & 0xff;
 117 }
 118
 119 static inline unsigned int get_cur_sas(
 120                 const struct kvmppc_vcpu_e500 *vcpu_e500)
 121 {
 122         return vcpu_e500->mas6 & 0x1;
 123 }
 124
 125 static inline unsigned int get_tlb_tlbsel(
 126                 const struct kvmppc_vcpu_e500 *vcpu_e500)
 127 {
 128         /*
 129          * Manual says that tlbsel has 2 bits wide.
 130          * Since we only have two TLBs, only lower bit is used.
 131          */
 132         return (vcpu_e500->mas0 >> 28) & 0x1;
 133 }
 134
 135 static inline unsigned int get_tlb_nv_bit(
 136                 const struct kvmppc_vcpu_e500 *vcpu_e500)
 137 {
 138         return vcpu_e500->mas0 & 0xfff;
 139 }
 140
 141 static inline unsigned int get_tlb_esel_bit(
 142                 const struct kvmppc_vcpu_e500 *vcpu_e500)
 143 {
 144         return (vcpu_e500->mas0 >> 16) & 0xfff;
 145 }
 146
 147 static inline unsigned int get_tlb_esel(
 148                 const struct kvmppc_vcpu_e500 *vcpu_e500,
 149                 int tlbsel)
 150 {
 151         unsigned int esel = get_tlb_esel_bit(vcpu_e500);
 152
 153         if (tlbsel == 0) {
 154                 esel &= KVM_E500_TLB0_WAY_NUM_MASK;
 155                 esel |= ((vcpu_e500->mas2 >> 12) & KVM_E500_TLB0_WAY_SIZE_MASK)
 156                                 << KVM_E500_TLB0_WAY_NUM_BIT;
 157         } else {
 158                 esel &= KVM_E500_TLB1_SIZE - 1;
 159         }
 160
 161         return esel;
 162 }
 163
 164 static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
 165                         const struct tlbe *tlbe)
 166 {
 167         gpa_t gpa;
 168
 169         if (!get_tlb_v(tlbe))
 170                 return 0;
 171
 172         /* Does it match current guest AS? */
 173         /* XXX what about IS != DS? */
 174         if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS))
 175                 return 0;
 176
 177         gpa = get_tlb_raddr(tlbe);
 178         if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
 179                 /* Mapping is not for RAM. */
 180                 return 0;
 181
 182         return 1;
 183 }
 184
 185 #endif /* __KVM_E500_TLB_H__ */