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 #include <asm/cputhreads.h>
  26
  27 enum vcpu_ftr {
  28         VCPU_FTR_MMU_V2
  29 };
  30
  31 #define E500_PID_NUM   3
  32 #define E500_TLB_NUM   2
  33
  34 /* entry is mapped somewhere in host TLB */
  35 #define E500_TLB_VALID          (1 << 31)
  36 /* TLB1 entry is mapped by host TLB1, tracked by bitmaps */
  37 #define E500_TLB_BITMAP         (1 << 30)
  38 /* TLB1 entry is mapped by host TLB0 */
  39 #define E500_TLB_TLB0           (1 << 29)
  40 /* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
  41 #define E500_TLB_MAS2_ATTR      (0x7f)
  42
  43 struct tlbe_ref {
  44         kvm_pfn_t pfn;          /* valid only for TLB0, except briefly */
  45         unsigned int flags;     /* E500_TLB_* */
  46 };
  47
  48 struct tlbe_priv {
  49         struct tlbe_ref ref;
  50 };
  51
  52 #ifdef CONFIG_KVM_E500V2
  53 struct vcpu_id_table;
  54 #endif
  55
  56 struct kvmppc_e500_tlb_params {
  57         int entries, ways, sets;
  58 };
  59
  60 struct kvmppc_vcpu_e500 {
  61         struct kvm_vcpu vcpu;
  62
  63         /* Unmodified copy of the guest's TLB -- shared with host userspace. */
  64         struct kvm_book3e_206_tlb_entry *gtlb_arch;
  65
  66         /* Starting entry number in gtlb_arch[] */
  67         int gtlb_offset[E500_TLB_NUM];
  68
  69         /* KVM internal information associated with each guest TLB entry */
  70         struct tlbe_priv *gtlb_priv[E500_TLB_NUM];
  71
  72         struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];
  73
  74         unsigned int gtlb_nv[E500_TLB_NUM];
  75
  76         unsigned int host_tlb1_nv;
  77
  78         u32 svr;
  79         u32 l1csr0;
  80         u32 l1csr1;
  81         u32 hid0;
  82         u32 hid1;
  83         u64 mcar;
  84
  85         struct page **shared_tlb_pages;
  86         int num_shared_tlb_pages;
  87
  88         u64 *g2h_tlb1_map;
  89         unsigned int *h2g_tlb1_rmap;
  90
  91         /* Minimum and maximum address mapped my TLB1 */
  92         unsigned long tlb1_min_eaddr;
  93         unsigned long tlb1_max_eaddr;
  94
  95 #ifdef CONFIG_KVM_E500V2
  96         u32 pid[E500_PID_NUM];
  97
  98         /* vcpu id table */
  99         struct vcpu_id_table *idt;
 100 #endif
 101 };
 102
 103 static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
 104 {
 105         return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
 106 }
 107
 108
 109 /* This geometry is the legacy default -- can be overridden by userspace */
 110 #define KVM_E500_TLB0_WAY_SIZE          128
 111 #define KVM_E500_TLB0_WAY_NUM           2
 112
 113 #define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
 114 #define KVM_E500_TLB1_SIZE  16
 115
 116 #define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
 117 #define tlbsel_of(index)        ((index) >> 16)
 118 #define esel_of(index)          ((index) & 0xFFFF)
 119
 120 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
 121 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
 122 #define MAS2_ATTRIB_MASK \
 123           (MAS2_X0 | MAS2_X1 | MAS2_E | MAS2_G)
 124 #define MAS3_ATTRIB_MASK \
 125           (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
 126            | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
 127
 128 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
 129                                 ulong value);
 130 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
 131 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
 132 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea);
 133 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea);
 134 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea);
 135 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
 136 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);
 137
 138 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 139 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
 140
 141 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 142                                 union kvmppc_one_reg *val);
 143 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
 144                                union kvmppc_one_reg *val);
 145
 146 #ifdef CONFIG_KVM_E500V2
 147 unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
 148                                  unsigned int as, unsigned int gid,
 149                                  unsigned int pr, int avoid_recursion);
 150 #endif
 151
 152 /* TLB helper functions */
 153 static inline unsigned int
 154 get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
 155 {
 156         return (tlbe->mas1 >> 7) & 0x1f;
 157 }
 158
 159 static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 160 {
 161         return tlbe->mas2 & MAS2_EPN;
 162 }
 163
 164 static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
 165 {
 166         unsigned int pgsize = get_tlb_size(tlbe);
 167         return 1ULL << 10 << pgsize;
 168 }
 169
 170 static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
 171 {
 172         u64 bytes = get_tlb_bytes(tlbe);
 173         return get_tlb_eaddr(tlbe) + bytes - 1;
 174 }
 175
 176 static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
 177 {
 178         return tlbe->mas7_3 & ~0xfffULL;
 179 }
 180
 181 static inline unsigned int
 182 get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
 183 {
 184         return (tlbe->mas1 >> 16) & 0xff;
 185 }
 186
 187 static inline unsigned int
 188 get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
 189 {
 190         return (tlbe->mas1 >> 12) & 0x1;
 191 }
 192
 193 static inline unsigned int
 194 get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
 195 {
 196         return (tlbe->mas1 >> 31) & 0x1;
 197 }
 198
 199 static inline unsigned int
 200 get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
 201 {
 202         return (tlbe->mas1 >> 30) & 0x1;
 203 }
 204
 205 static inline unsigned int
 206 get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
 207 {
 208         return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
 209 }
 210
 211 static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
 212 {
 213         return vcpu->arch.pid & 0xff;
 214 }
 215
 216 static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
 217 {
 218         return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
 219 }
 220
 221 static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
 222 {
 223         return !!(vcpu->arch.shared->msr & MSR_PR);
 224 }
 225
 226 static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
 227 {
 228         return (vcpu->arch.shared->mas6 >> 16) & 0xff;
 229 }
 230
 231 static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
 232 {
 233         return vcpu->arch.shared->mas6 & 0x1;
 234 }
 235
 236 static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
 237 {
 238         /*
 239          * Manual says that tlbsel has 2 bits wide.
 240          * Since we only have two TLBs, only lower bit is used.
 241          */
 242         return (vcpu->arch.shared->mas0 >> 28) & 0x1;
 243 }
 244
 245 static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
 246 {
 247         return vcpu->arch.shared->mas0 & 0xfff;
 248 }
 249
 250 static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
 251 {
 252         return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
 253 }
 254
 255 static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
 256                         const struct kvm_book3e_206_tlb_entry *tlbe)
 257 {
 258         gpa_t gpa;
 259
 260         if (!get_tlb_v(tlbe))
 261                 return 0;
 262
 263 #ifndef CONFIG_KVM_BOOKE_HV
 264         /* Does it match current guest AS? */
 265         /* XXX what about IS != DS? */
 266         if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
 267                 return 0;
 268 #endif
 269
 270         gpa = get_tlb_raddr(tlbe);
 271         if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
 272                 /* Mapping is not for RAM. */
 273                 return 0;
 274
 275         return 1;
 276 }
 277
 278 static inline struct kvm_book3e_206_tlb_entry *get_entry(
 279         struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
 280 {
 281         int offset = vcpu_e500->gtlb_offset[tlbsel];
 282         return &vcpu_e500->gtlb_arch[offset + entry];
 283 }
 284
 285 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
 286                            struct kvm_book3e_206_tlb_entry *gtlbe);
 287 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);
 288
 289 #ifdef CONFIG_KVM_BOOKE_HV
 290 #define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
 291 #define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
 292 #define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
 293
 294 /*
 295  * These functions should be called with preemption disabled
 296  * and the returned value is valid only in that context
 297  */
 298 static inline int get_thread_specific_lpid(int vm_lpid)
 299 {
 300         int vcpu_lpid = vm_lpid;
 301
 302         if (threads_per_core == 2)
 303                 vcpu_lpid |= smp_processor_id() & 1;
 304
 305         return vcpu_lpid;
 306 }
 307
 308 static inline int get_lpid(struct kvm_vcpu *vcpu)
 309 {
 310         return get_thread_specific_lpid(vcpu->kvm->arch.lpid);
 311 }
 312 #else
 313 unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
 314                                       struct kvm_book3e_206_tlb_entry *gtlbe);
 315
 316 static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
 317 {
 318         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 319         unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;
 320
 321         return vcpu_e500->pid[tidseld];
 322 }
 323
 324 /* Force TS=1 for all guest mappings. */
 325 #define get_tlb_sts(gtlbe)              (MAS1_TS)
 326 #endif /* !BOOKE_HV */
 327
 328 static inline bool has_feature(const struct kvm_vcpu *vcpu,
 329                                enum vcpu_ftr ftr)
 330 {
 331         bool has_ftr;
 332         switch (ftr) {
 333         case VCPU_FTR_MMU_V2:
 334                 has_ftr = ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
 335                 break;
 336         default:
 337                 return false;
 338         }
 339         return has_ftr;
 340 }
 341
 342 #endif /* KVM_E500_H */