arch/powerpc/kvm/e500.h

   1 /*
   2  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: Yu Liu <yu.liu@freescale.com>
   5  *         Scott Wood <scottwood@freescale.com>
   6  *         Ashish Kalra <ashish.kalra@freescale.com>
   7  *         Varun Sethi <varun.sethi@freescale.com>
   8  *
   9  * Description:
  10  * This file is based on arch/powerpc/kvm/44x_tlb.h and
  11  * arch/powerpc/include/asm/kvm_44x.h by Hollis Blanchard <hollisb@us.ibm.com>,
  12  * Copyright IBM Corp. 2007-2008
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License, version 2, as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #ifndef KVM_E500_H
  20 #define KVM_E500_H
  21
  22 #include <linux/kvm_host.h>
  23 #include <asm/mmu-book3e.h>
  24 #include <asm/tlb.h>
  25
  26 enum vcpu_ftr {
  27         VCPU_FTR_MMU_V2
  28 };
  29
  30 #define E500_PID_NUM   3
  31 #define E500_TLB_NUM   2
  32
  33 /* entry is mapped somewhere in host TLB */
  34 #define E500_TLB_VALID          (1 << 31)
  35 /* TLB1 entry is mapped by host TLB1, tracked by bitmaps */
  36 #define E500_TLB_BITMAP         (1 << 30)
  37 /* TLB1 entry is mapped by host TLB0 */
  38 #define E500_TLB_TLB0           (1 << 29)
  39 /* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
  40 #define E500_TLB_MAS2_ATTR      (0x7f)
  41
  42 struct tlbe_ref {
  43         pfn_t pfn;              /* valid only for TLB0, except briefly */
  44         unsigned int flags;     /* E500_TLB_* */
  45 };
  46
  47 struct tlbe_priv {
  48         struct tlbe_ref ref;
  49 };
  50
  51 #ifdef CONFIG_KVM_E500V2
  52 struct vcpu_id_table;
  53 #endif
  54
  55 struct kvmppc_e500_tlb_params {
  56         int entries, ways, sets;
  57 };
  58
  59 struct kvmppc_vcpu_e500 {
  60         struct kvm_vcpu vcpu;
  61
  62         /* Unmodified copy of the guest's TLB -- shared with host userspace. */
  63         struct kvm_book3e_206_tlb_entry *gtlb_arch;
  64
  65         /* Starting entry number in gtlb_arch[] */
  66         int gtlb_offset[E500_TLB_NUM];
  67
  68         /* KVM internal information associated with each guest TLB entry */
  69         struct tlbe_priv *gtlb_priv[E500_TLB_NUM];
  70
  71         struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];
  72
  73         unsigned int gtlb_nv[E500_TLB_NUM];
  74
  75         unsigned int host_tlb1_nv;
  76
  77         u32 svr;
  78         u32 l1csr0;
  79         u32 l1csr1;
  80         u32 hid0;
  81         u32 hid1;
  82         u64 mcar;
  83
  84         struct page **shared_tlb_pages;
  85         int num_shared_tlb_pages;
  86
  87         u64 *g2h_tlb1_map;
  88         unsigned int *h2g_tlb1_rmap;
  89
  90         /* Minimum and maximum address mapped my TLB1 */
  91         unsigned long tlb1_min_eaddr;
  92         unsigned long tlb1_max_eaddr;
  93
  94 #ifdef CONFIG_KVM_E500V2
  95         u32 pid[E500_PID_NUM];
  96
  97         /* vcpu id table */
  98         struct vcpu_id_table *idt;
  99 #endif
 100 };
 101
 102 static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
 103 {
 104         return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
 105 }
 106
 107
 108 /* This geometry is the legacy default -- can be overridden by userspace */
 109 #define KVM_E500_TLB0_WAY_SIZE          128
 110 #define KVM_E500_TLB0_WAY_NUM           2
 111
 112 #define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
 113 #define KVM_E500_TLB1_SIZE  16
 114
 115 #define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
 116 #define tlbsel_of(index)        ((index) >> 16)
 117 #define esel_of(index)          ((index) & 0xFFFF)
 118
 119 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
 120 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
 121 #define MAS2_ATTRIB_MASK \
 122           (MAS2_X0 | MAS2_X1 | MAS2_E | MAS2_G)
 123 #define MAS3_ATTRIB_MASK \
 124           (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
 125            | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
 126
 127 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
 128                                 ulong value);
 129 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
 130 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
 131 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea);
 132 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea);
 133 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea);
 134 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
 135 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);
 136
 137 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 138 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 139
 140 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 141                                 union kvmppc_one_reg *val);
 142 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 143                                union kvmppc_one_reg *val);
 144
 145 #ifdef CONFIG_KVM_E500V2
 146 unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
 147                                  unsigned int as, unsigned int gid,
 148                                  unsigned int pr, int avoid_recursion);
 149 #endif
 150
 151 /* TLB helper functions */
 152 static inline unsigned int
 153 get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
 154 {
 155         return (tlbe->mas1 >> 7) & 0x1f;
 156 }
 157
 158 static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 159 {
 160         return tlbe->mas2 & MAS2_EPN;
 161 }
 162
 163 static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
 164 {
 165         unsigned int pgsize = get_tlb_size(tlbe);
 166         return 1ULL << 10 << pgsize;
 167 }
 168
 169 static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
 170 {
 171         u64 bytes = get_tlb_bytes(tlbe);
 172         return get_tlb_eaddr(tlbe) + bytes - 1;
 173 }
 174
 175 static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 176 {
 177         return tlbe->mas7_3 & ~0xfffULL;
 178 }
 179
 180 static inline unsigned int
 181 get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
 182 {
 183         return (tlbe->mas1 >> 16) & 0xff;
 184 }
 185
 186 static inline unsigned int
 187 get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
 188 {
 189         return (tlbe->mas1 >> 12) & 0x1;
 190 }
 191
 192 static inline unsigned int
 193 get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
 194 {
 195         return (tlbe->mas1 >> 31) & 0x1;
 196 }
 197
 198 static inline unsigned int
 199 get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
 200 {
 201         return (tlbe->mas1 >> 30) & 0x1;
 202 }
 203
 204 static inline unsigned int
 205 get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
 206 {
 207         return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
 208 }
 209
 210 static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
 211 {
 212         return vcpu->arch.pid & 0xff;
 213 }
 214
 215 static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
 216 {
 217         return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
 218 }
 219
 220 static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
 221 {
 222         return !!(vcpu->arch.shared->msr & MSR_PR);
 223 }
 224
 225 static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
 226 {
 227         return (vcpu->arch.shared->mas6 >> 16) & 0xff;
 228 }
 229
 230 static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
 231 {
 232         return vcpu->arch.shared->mas6 & 0x1;
 233 }
 234
 235 static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
 236 {
 237         /*
 238          * Manual says that tlbsel has 2 bits wide.
 239          * Since we only have two TLBs, only lower bit is used.
 240          */
 241         return (vcpu->arch.shared->mas0 >> 28) & 0x1;
 242 }
 243
 244 static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
 245 {
 246         return vcpu->arch.shared->mas0 & 0xfff;
 247 }
 248
 249 static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
 250 {
 251         return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
 252 }
 253
 254 static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
 255                         const struct kvm_book3e_206_tlb_entry *tlbe)
 256 {
 257         gpa_t gpa;
 258
 259         if (!get_tlb_v(tlbe))
 260                 return 0;
 261
 262 #ifndef CONFIG_KVM_BOOKE_HV
 263         /* Does it match current guest AS? */
 264         /* XXX what about IS != DS? */
 265         if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
 266                 return 0;
 267 #endif
 268
 269         gpa = get_tlb_raddr(tlbe);
 270         if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
 271                 /* Mapping is not for RAM. */
 272                 return 0;
 273
 274         return 1;
 275 }
 276
 277 static inline struct kvm_book3e_206_tlb_entry *get_entry(
 278         struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
 279 {
 280         int offset = vcpu_e500->gtlb_offset[tlbsel];
 281         return &vcpu_e500->gtlb_arch[offset + entry];
 282 }
 283
 284 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
 285                            struct kvm_book3e_206_tlb_entry *gtlbe);
 286 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);
 287
 288 #ifdef CONFIG_KVM_BOOKE_HV
 289 #define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
 290 #define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
 291 #define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
 292 #else
 293 unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
 294                                       struct kvm_book3e_206_tlb_entry *gtlbe);
 295
 296 static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
 297 {
 298         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 299         unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;
 300
 301         return vcpu_e500->pid[tidseld];
 302 }
 303
 304 /* Force TS=1 for all guest mappings. */
 305 #define get_tlb_sts(gtlbe)              (MAS1_TS)
 306 #endif /* !BOOKE_HV */
 307
 308 static inline bool has_feature(const struct kvm_vcpu *vcpu,
 309                                enum vcpu_ftr ftr)
 310 {
 311         bool has_ftr;
 312         switch (ftr) {
 313         case VCPU_FTR_MMU_V2:
 314                 has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
 315                 break;
 316         default:
 317                 return false;
 318         }
 319         return has_ftr;
 320 }
 321
 322 #endif /* KVM_E500_H */