arch/powerpc/kvm/e500.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
   4  *
   5  * Author: Yu Liu <yu.liu@freescale.com>
   6  *         Scott Wood <scottwood@freescale.com>
   7  *         Ashish Kalra <ashish.kalra@freescale.com>
   8  *         Varun Sethi <varun.sethi@freescale.com>
   9  *
  10  * Description:
  11  * This file is based on arch/powerpc/kvm/44x_tlb.h and
  12  * arch/powerpc/include/asm/kvm_44x.h by Hollis Blanchard <hollisb@us.ibm.com>,
  13  * Copyright IBM Corp. 2007-2008
  14  */
  15
  16 #ifndef KVM_E500_H
  17 #define KVM_E500_H
  18
  19 #include <linux/kvm_host.h>
  20 #include <asm/nohash/mmu-book3e.h>
  21 #include <asm/tlb.h>
  22 #include <asm/cputhreads.h>
  23
  24 enum vcpu_ftr {
  25         VCPU_FTR_MMU_V2
  26 };
  27
  28 #define E500_PID_NUM   3
  29 #define E500_TLB_NUM   2
  30
  31 /* entry is mapped somewhere in host TLB */
  32 #define E500_TLB_VALID          (1 << 31)
  33 /* TLB1 entry is mapped by host TLB1, tracked by bitmaps */
  34 #define E500_TLB_BITMAP         (1 << 30)
  35 /* TLB1 entry is mapped by host TLB0 */
  36 #define E500_TLB_TLB0           (1 << 29)
  37 /* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
  38 #define E500_TLB_MAS2_ATTR      (0x7f)
  39
  40 struct tlbe_ref {
  41         kvm_pfn_t pfn;          /* valid only for TLB0, except briefly */
  42         unsigned int flags;     /* E500_TLB_* */
  43 };
  44
  45 struct tlbe_priv {
  46         struct tlbe_ref ref;
  47 };
  48
  49 #ifdef CONFIG_KVM_E500V2
  50 struct vcpu_id_table;
  51 #endif
  52
  53 struct kvmppc_e500_tlb_params {
  54         int entries, ways, sets;
  55 };
  56
  57 struct kvmppc_vcpu_e500 {
  58         struct kvm_vcpu vcpu;
  59
  60         /* Unmodified copy of the guest's TLB -- shared with host userspace. */
  61         struct kvm_book3e_206_tlb_entry *gtlb_arch;
  62
  63         /* Starting entry number in gtlb_arch[] */
  64         int gtlb_offset[E500_TLB_NUM];
  65
  66         /* KVM internal information associated with each guest TLB entry */
  67         struct tlbe_priv *gtlb_priv[E500_TLB_NUM];
  68
  69         struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];
  70
  71         unsigned int gtlb_nv[E500_TLB_NUM];
  72
  73         unsigned int host_tlb1_nv;
  74
  75         u32 svr;
  76         u32 l1csr0;
  77         u32 l1csr1;
  78         u32 hid0;
  79         u32 hid1;
  80         u64 mcar;
  81
  82         struct page **shared_tlb_pages;
  83         int num_shared_tlb_pages;
  84
  85         u64 *g2h_tlb1_map;
  86         unsigned int *h2g_tlb1_rmap;
  87
  88         /* Minimum and maximum address mapped my TLB1 */
  89         unsigned long tlb1_min_eaddr;
  90         unsigned long tlb1_max_eaddr;
  91
  92 #ifdef CONFIG_KVM_E500V2
  93         u32 pid[E500_PID_NUM];
  94
  95         /* vcpu id table */
  96         struct vcpu_id_table *idt;
  97 #endif
  98 };
  99
 100 static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
 101 {
 102         return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
 103 }
 104
 105
 106 /* This geometry is the legacy default -- can be overridden by userspace */
 107 #define KVM_E500_TLB0_WAY_SIZE          128
 108 #define KVM_E500_TLB0_WAY_NUM           2
 109
 110 #define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
 111 #define KVM_E500_TLB1_SIZE  16
 112
 113 #define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
 114 #define tlbsel_of(index)        ((index) >> 16)
 115 #define esel_of(index)          ((index) & 0xFFFF)
 116
 117 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
 118 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
 119 #define MAS2_ATTRIB_MASK \
 120           (MAS2_X0 | MAS2_X1 | MAS2_E | MAS2_G)
 121 #define MAS3_ATTRIB_MASK \
 122           (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
 123            | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
 124
 125 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
 126                                 ulong value);
 127 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
 128 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
 129 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea);
 130 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea);
 131 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea);
 132 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
 133 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);
 134
 135 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 136 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 137
 138 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 139                                 union kvmppc_one_reg *val);
 140 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 141                                union kvmppc_one_reg *val);
 142
 143 #ifdef CONFIG_KVM_E500V2
 144 unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
 145                                  unsigned int as, unsigned int gid,
 146                                  unsigned int pr, int avoid_recursion);
 147 #endif
 148
 149 /* TLB helper functions */
 150 static inline unsigned int
 151 get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
 152 {
 153         return (tlbe->mas1 >> 7) & 0x1f;
 154 }
 155
 156 static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 157 {
 158         return tlbe->mas2 & MAS2_EPN;
 159 }
 160
 161 static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
 162 {
 163         unsigned int pgsize = get_tlb_size(tlbe);
 164         return 1ULL << 10 << pgsize;
 165 }
 166
 167 static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
 168 {
 169         u64 bytes = get_tlb_bytes(tlbe);
 170         return get_tlb_eaddr(tlbe) + bytes - 1;
 171 }
 172
 173 static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 174 {
 175         return tlbe->mas7_3 & ~0xfffULL;
 176 }
 177
 178 static inline unsigned int
 179 get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
 180 {
 181         return (tlbe->mas1 >> 16) & 0xff;
 182 }
 183
 184 static inline unsigned int
 185 get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
 186 {
 187         return (tlbe->mas1 >> 12) & 0x1;
 188 }
 189
 190 static inline unsigned int
 191 get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
 192 {
 193         return (tlbe->mas1 >> 31) & 0x1;
 194 }
 195
 196 static inline unsigned int
 197 get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
 198 {
 199         return (tlbe->mas1 >> 30) & 0x1;
 200 }
 201
 202 static inline unsigned int
 203 get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
 204 {
 205         return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
 206 }
 207
 208 static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
 209 {
 210         return vcpu->arch.pid & 0xff;
 211 }
 212
 213 static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
 214 {
 215         return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
 216 }
 217
 218 static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
 219 {
 220         return !!(vcpu->arch.shared->msr & MSR_PR);
 221 }
 222
 223 static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
 224 {
 225         return (vcpu->arch.shared->mas6 >> 16) & 0xff;
 226 }
 227
 228 static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
 229 {
 230         return vcpu->arch.shared->mas6 & 0x1;
 231 }
 232
 233 static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
 234 {
 235         /*
 236          * Manual says that tlbsel has 2 bits wide.
 237          * Since we only have two TLBs, only lower bit is used.
 238          */
 239         return (vcpu->arch.shared->mas0 >> 28) & 0x1;
 240 }
 241
 242 static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
 243 {
 244         return vcpu->arch.shared->mas0 & 0xfff;
 245 }
 246
 247 static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
 248 {
 249         return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
 250 }
 251
 252 static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
 253                         const struct kvm_book3e_206_tlb_entry *tlbe)
 254 {
 255         gpa_t gpa;
 256
 257         if (!get_tlb_v(tlbe))
 258                 return 0;
 259
 260 #ifndef CONFIG_KVM_BOOKE_HV
 261         /* Does it match current guest AS? */
 262         /* XXX what about IS != DS? */
 263         if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
 264                 return 0;
 265 #endif
 266
 267         gpa = get_tlb_raddr(tlbe);
 268         if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
 269                 /* Mapping is not for RAM. */
 270                 return 0;
 271
 272         return 1;
 273 }
 274
 275 static inline struct kvm_book3e_206_tlb_entry *get_entry(
 276         struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
 277 {
 278         int offset = vcpu_e500->gtlb_offset[tlbsel];
 279         return &vcpu_e500->gtlb_arch[offset + entry];
 280 }
 281
 282 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
 283                            struct kvm_book3e_206_tlb_entry *gtlbe);
 284 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);
 285
 286 #ifdef CONFIG_KVM_BOOKE_HV
 287 #define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
 288 #define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
 289 #define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
 290
 291 /*
 292  * These functions should be called with preemption disabled
 293  * and the returned value is valid only in that context
 294  */
 295 static inline int get_thread_specific_lpid(int vm_lpid)
 296 {
 297         int vcpu_lpid = vm_lpid;
 298
 299         if (threads_per_core == 2)
 300                 vcpu_lpid |= smp_processor_id() & 1;
 301
 302         return vcpu_lpid;
 303 }
 304
 305 static inline int get_lpid(struct kvm_vcpu *vcpu)
 306 {
 307         return get_thread_specific_lpid(vcpu->kvm->arch.lpid);
 308 }
 309 #else
 310 unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
 311                                       struct kvm_book3e_206_tlb_entry *gtlbe);
 312
 313 static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
 314 {
 315         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 316         unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;
 317
 318         return vcpu_e500->pid[tidseld];
 319 }
 320
 321 /* Force TS=1 for all guest mappings. */
 322 #define get_tlb_sts(gtlbe)              (MAS1_TS)
 323 #endif /* !BOOKE_HV */
 324
 325 static inline bool has_feature(const struct kvm_vcpu *vcpu,
 326                                enum vcpu_ftr ftr)
 327 {
 328         bool has_ftr;
 329         switch (ftr) {
 330         case VCPU_FTR_MMU_V2:
 331                 has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
 332                 break;
 333         default:
 334                 return false;
 335         }
 336         return has_ftr;
 337 }
 338
 339 #endif /* KVM_E500_H */