arch/powerpc/kvm/e500_tlb.c

   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.c,
   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 #include <linux/types.h>
  16 #include <linux/string.h>
  17 #include <linux/kvm.h>
  18 #include <linux/kvm_host.h>
  19 #include <linux/highmem.h>
  20 #include <asm/kvm_ppc.h>
  21 #include <asm/kvm_e500.h>
  22
  23 #include "../mm/mmu_decl.h"
  24 #include "e500_tlb.h"
  25
  26 #define to_htlb1_esel(esel) (tlb1_entry_num - (esel) - 1)
  27
  28 static unsigned int tlb1_entry_num;
  29
  30 void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
  31 {
  32         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  33         struct tlbe *tlbe;
  34         int i, tlbsel;
  35
  36         printk("| %8s | %8s | %8s | %8s | %8s |\n",
  37                         "nr", "mas1", "mas2", "mas3", "mas7");
  38
  39         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
  40                 printk("Guest TLB%d:\n", tlbsel);
  41                 for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++) {
  42                         tlbe = &vcpu_e500->guest_tlb[tlbsel][i];
  43                         if (tlbe->mas1 & MAS1_VALID)
  44                                 printk(" G[%d][%3d] |  %08X | %08X | %08X | %08X |\n",
  45                                         tlbsel, i, tlbe->mas1, tlbe->mas2,
  46                                         tlbe->mas3, tlbe->mas7);
  47                 }
  48         }
  49
  50         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
  51                 printk("Shadow TLB%d:\n", tlbsel);
  52                 for (i = 0; i < vcpu_e500->shadow_tlb_size[tlbsel]; i++) {
  53                         tlbe = &vcpu_e500->shadow_tlb[tlbsel][i];
  54                         if (tlbe->mas1 & MAS1_VALID)
  55                                 printk(" S[%d][%3d] |  %08X | %08X | %08X | %08X |\n",
  56                                         tlbsel, i, tlbe->mas1, tlbe->mas2,
  57                                         tlbe->mas3, tlbe->mas7);
  58                 }
  59         }
  60 }
  61
  62 static inline unsigned int tlb0_get_next_victim(
  63                 struct kvmppc_vcpu_e500 *vcpu_e500)
  64 {
  65         unsigned int victim;
  66
  67         victim = vcpu_e500->guest_tlb_nv[0]++;
  68         if (unlikely(vcpu_e500->guest_tlb_nv[0] >= KVM_E500_TLB0_WAY_NUM))
  69                 vcpu_e500->guest_tlb_nv[0] = 0;
  70
  71         return victim;
  72 }
  73
  74 static inline unsigned int tlb1_max_shadow_size(void)
  75 {
  76         return tlb1_entry_num - tlbcam_index;
  77 }
  78
  79 static inline int tlbe_is_writable(struct tlbe *tlbe)
  80 {
  81         return tlbe->mas3 & (MAS3_SW|MAS3_UW);
  82 }
  83
  84 static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
  85 {
  86         /* Mask off reserved bits. */
  87         mas3 &= MAS3_ATTRIB_MASK;
  88
  89         if (!usermode) {
  90                 /* Guest is in supervisor mode,
  91                  * so we need to translate guest
  92                  * supervisor permissions into user permissions. */
  93                 mas3 &= ~E500_TLB_USER_PERM_MASK;
  94                 mas3 |= (mas3 & E500_TLB_SUPER_PERM_MASK) << 1;
  95         }
  96
  97         return mas3 | E500_TLB_SUPER_PERM_MASK;
  98 }
  99
 100 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
 101 {
 102 #ifdef CONFIG_SMP
 103         return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
 104 #else
 105         return mas2 & MAS2_ATTRIB_MASK;
 106 #endif
 107 }
 108
 109 /*
 110  * writing shadow tlb entry to host TLB
 111  */
 112 static inline void __write_host_tlbe(struct tlbe *stlbe)
 113 {
 114         mtspr(SPRN_MAS1, stlbe->mas1);
 115         mtspr(SPRN_MAS2, stlbe->mas2);
 116         mtspr(SPRN_MAS3, stlbe->mas3);
 117         mtspr(SPRN_MAS7, stlbe->mas7);
 118         __asm__ __volatile__ ("tlbwe\n" : : );
 119 }
 120
 121 static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
 122                 int tlbsel, int esel)
 123 {
 124         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 125
 126         local_irq_disable();
 127         if (tlbsel == 0) {
 128                 __write_host_tlbe(stlbe);
 129         } else {
 130                 unsigned register mas0;
 131
 132                 mas0 = mfspr(SPRN_MAS0);
 133
 134                 mtspr(SPRN_MAS0, MAS0_TLBSEL(1) | MAS0_ESEL(to_htlb1_esel(esel)));
 135                 __write_host_tlbe(stlbe);
 136
 137                 mtspr(SPRN_MAS0, mas0);
 138         }
 139         local_irq_enable();
 140 }
 141
 142 void kvmppc_e500_tlb_load(struct kvm_vcpu *vcpu, int cpu)
 143 {
 144         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 145         int i;
 146         unsigned register mas0;
 147
 148         /* Load all valid TLB1 entries to reduce guest tlb miss fault */
 149         local_irq_disable();
 150         mas0 = mfspr(SPRN_MAS0);
 151         for (i = 0; i < tlb1_max_shadow_size(); i++) {
 152                 struct tlbe *stlbe = &vcpu_e500->shadow_tlb[1][i];
 153
 154                 if (get_tlb_v(stlbe)) {
 155                         mtspr(SPRN_MAS0, MAS0_TLBSEL(1)
 156                                         | MAS0_ESEL(to_htlb1_esel(i)));
 157                         __write_host_tlbe(stlbe);
 158                 }
 159         }
 160         mtspr(SPRN_MAS0, mas0);
 161         local_irq_enable();
 162 }
 163
 164 void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu)
 165 {
 166         _tlbil_all();
 167 }
 168
 169 /* Search the guest TLB for a matching entry. */
 170 static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
 171                 gva_t eaddr, int tlbsel, unsigned int pid, int as)
 172 {
 173         int i;
 174
 175         /* XXX Replace loop with fancy data structures. */
 176         for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++) {
 177                 struct tlbe *tlbe = &vcpu_e500->guest_tlb[tlbsel][i];
 178                 unsigned int tid;
 179
 180                 if (eaddr < get_tlb_eaddr(tlbe))
 181                         continue;
 182
 183                 if (eaddr > get_tlb_end(tlbe))
 184                         continue;
 185
 186                 tid = get_tlb_tid(tlbe);
 187                 if (tid && (tid != pid))
 188                         continue;
 189
 190                 if (!get_tlb_v(tlbe))
 191                         continue;
 192
 193                 if (get_tlb_ts(tlbe) != as && as != -1)
 194                         continue;
 195
 196                 return i;
 197         }
 198
 199         return -1;
 200 }
 201
 202 static void kvmppc_e500_shadow_release(struct kvmppc_vcpu_e500 *vcpu_e500,
 203                 int tlbsel, int esel)
 204 {
 205         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 206         struct page *page = vcpu_e500->shadow_pages[tlbsel][esel];
 207
 208         if (page) {
 209                 vcpu_e500->shadow_pages[tlbsel][esel] = NULL;
 210
 211                 if (get_tlb_v(stlbe)) {
 212                         if (tlbe_is_writable(stlbe))
 213                                 kvm_release_page_dirty(page);
 214                         else
 215                                 kvm_release_page_clean(page);
 216                 }
 217         }
 218 }
 219
 220 static void kvmppc_e500_stlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
 221                 int tlbsel, int esel)
 222 {
 223         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 224
 225         kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
 226         stlbe->mas1 = 0;
 227         KVMTRACE_5D(STLB_INVAL, &vcpu_e500->vcpu, index_of(tlbsel, esel),
 228                         stlbe->mas1, stlbe->mas2, stlbe->mas3, stlbe->mas7,
 229                         handler);
 230 }
 231
 232 static void kvmppc_e500_tlb1_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
 233                 gva_t eaddr, gva_t eend, u32 tid)
 234 {
 235         unsigned int pid = tid & 0xff;
 236         unsigned int i;
 237
 238         /* XXX Replace loop with fancy data structures. */
 239         for (i = 0; i < vcpu_e500->guest_tlb_size[1]; i++) {
 240                 struct tlbe *stlbe = &vcpu_e500->shadow_tlb[1][i];
 241                 unsigned int tid;
 242
 243                 if (!get_tlb_v(stlbe))
 244                         continue;
 245
 246                 if (eend < get_tlb_eaddr(stlbe))
 247                         continue;
 248
 249                 if (eaddr > get_tlb_end(stlbe))
 250                         continue;
 251
 252                 tid = get_tlb_tid(stlbe);
 253                 if (tid && (tid != pid))
 254                         continue;
 255
 256                 kvmppc_e500_stlbe_invalidate(vcpu_e500, 1, i);
 257                 write_host_tlbe(vcpu_e500, 1, i);
 258         }
 259 }
 260
 261 static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
 262                 unsigned int eaddr, int as)
 263 {
 264         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 265         unsigned int victim, pidsel, tsized;
 266         int tlbsel;
 267
 268         /* since we only have two TLBs, only lower bit is used. */
 269         tlbsel = (vcpu_e500->mas4 >> 28) & 0x1;
 270         victim = (tlbsel == 0) ? tlb0_get_next_victim(vcpu_e500) : 0;
 271         pidsel = (vcpu_e500->mas4 >> 16) & 0xf;
 272         tsized = (vcpu_e500->mas4 >> 8) & 0xf;
 273
 274         vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
 275                 | MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 276         vcpu_e500->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
 277                 | MAS1_TID(vcpu_e500->pid[pidsel])
 278                 | MAS1_TSIZE(tsized);
 279         vcpu_e500->mas2 = (eaddr & MAS2_EPN)
 280                 | (vcpu_e500->mas4 & MAS2_ATTRIB_MASK);
 281         vcpu_e500->mas3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
 282         vcpu_e500->mas6 = (vcpu_e500->mas6 & MAS6_SPID1)
 283                 | (get_cur_pid(vcpu) << 16)
 284                 | (as ? MAS6_SAS : 0);
 285         vcpu_e500->mas7 = 0;
 286 }
 287
 288 static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 289         u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int esel)
 290 {
 291         struct page *new_page;
 292         struct tlbe *stlbe;
 293         hpa_t hpaddr;
 294
 295         stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 296
 297         /* Get reference to new page. */
 298         new_page = gfn_to_page(vcpu_e500->vcpu.kvm, gfn);
 299         if (is_error_page(new_page)) {
 300                 printk(KERN_ERR "Couldn't get guest page for gfn %lx!\n", gfn);
 301                 kvm_release_page_clean(new_page);
 302                 return;
 303         }
 304         hpaddr = page_to_phys(new_page);
 305
 306         /* Drop reference to old page. */
 307         kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
 308
 309         vcpu_e500->shadow_pages[tlbsel][esel] = new_page;
 310
 311         /* Force TS=1 IPROT=0 TSIZE=4KB for all guest mappings. */
 312         stlbe->mas1 = MAS1_TSIZE(BOOKE_PAGESZ_4K)
 313                 | MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID;
 314         stlbe->mas2 = (gvaddr & MAS2_EPN)
 315                 | e500_shadow_mas2_attrib(gtlbe->mas2,
 316                                 vcpu_e500->vcpu.arch.msr & MSR_PR);
 317         stlbe->mas3 = (hpaddr & MAS3_RPN)
 318                 | e500_shadow_mas3_attrib(gtlbe->mas3,
 319                                 vcpu_e500->vcpu.arch.msr & MSR_PR);
 320         stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN;
 321
 322         KVMTRACE_5D(STLB_WRITE, &vcpu_e500->vcpu, index_of(tlbsel, esel),
 323                         stlbe->mas1, stlbe->mas2, stlbe->mas3, stlbe->mas7,
 324                         handler);
 325 }
 326
 327 /* XXX only map the one-one case, for now use TLB0 */
 328 static int kvmppc_e500_stlbe_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 329                 int tlbsel, int esel)
 330 {
 331         struct tlbe *gtlbe;
 332
 333         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 334
 335         kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
 336                         get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
 337                         gtlbe, tlbsel, esel);
 338
 339         return esel;
 340 }
 341
 342 /* Caller must ensure that the specified guest TLB entry is safe to insert into
 343  * the shadow TLB. */
 344 /* XXX for both one-one and one-to-many , for now use TLB1 */
 345 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 346                 u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe)
 347 {
 348         unsigned int victim;
 349
 350         victim = vcpu_e500->guest_tlb_nv[1]++;
 351
 352         if (unlikely(vcpu_e500->guest_tlb_nv[1] >= tlb1_max_shadow_size()))
 353                 vcpu_e500->guest_tlb_nv[1] = 0;
 354
 355         kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, victim);
 356
 357         return victim;
 358 }
 359
 360 /* Invalidate all guest kernel mappings when enter usermode,
 361  * so that when they fault back in they will get the
 362  * proper permission bits. */
 363 void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode)
 364 {
 365         if (usermode) {
 366                 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 367                 int i;
 368
 369                 /* XXX Replace loop with fancy data structures. */
 370                 for (i = 0; i < tlb1_max_shadow_size(); i++)
 371                         kvmppc_e500_stlbe_invalidate(vcpu_e500, 1, i);
 372
 373                 _tlbil_all();
 374         }
 375 }
 376
 377 static int kvmppc_e500_gtlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
 378                 int tlbsel, int esel)
 379 {
 380         struct tlbe *gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 381
 382         if (unlikely(get_tlb_iprot(gtlbe)))
 383                 return -1;
 384
 385         if (tlbsel == 1) {
 386                 kvmppc_e500_tlb1_invalidate(vcpu_e500, get_tlb_eaddr(gtlbe),
 387                                 get_tlb_end(gtlbe),
 388                                 get_tlb_tid(gtlbe));
 389         } else {
 390                 kvmppc_e500_stlbe_invalidate(vcpu_e500, tlbsel, esel);
 391         }
 392
 393         gtlbe->mas1 = 0;
 394
 395         return 0;
 396 }
 397
 398 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
 399 {
 400         int esel;
 401
 402         if (value & MMUCSR0_TLB0FI)
 403                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[0]; esel++)
 404                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
 405         if (value & MMUCSR0_TLB1FI)
 406                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[1]; esel++)
 407                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
 408
 409         _tlbil_all();
 410
 411         return EMULATE_DONE;
 412 }
 413
 414 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb)
 415 {
 416         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 417         unsigned int ia;
 418         int esel, tlbsel;
 419         gva_t ea;
 420
 421         ea = ((ra) ? vcpu->arch.gpr[ra] : 0) + vcpu->arch.gpr[rb];
 422
 423         ia = (ea >> 2) & 0x1;
 424
 425         /* since we only have two TLBs, only lower bit is used. */
 426         tlbsel = (ea >> 3) & 0x1;
 427
 428         if (ia) {
 429                 /* invalidate all entries */
 430                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[tlbsel]; esel++)
 431                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
 432         } else {
 433                 ea &= 0xfffff000;
 434                 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
 435                                 get_cur_pid(vcpu), -1);
 436                 if (esel >= 0)
 437                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
 438         }
 439
 440         _tlbil_all();
 441
 442         return EMULATE_DONE;
 443 }
 444
 445 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
 446 {
 447         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 448         int tlbsel, esel;
 449         struct tlbe *gtlbe;
 450
 451         tlbsel = get_tlb_tlbsel(vcpu_e500);
 452         esel = get_tlb_esel(vcpu_e500, tlbsel);
 453
 454         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 455         vcpu_e500->mas0 &= ~MAS0_NV(~0);
 456         vcpu_e500->mas0 |= MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 457         vcpu_e500->mas1 = gtlbe->mas1;
 458         vcpu_e500->mas2 = gtlbe->mas2;
 459         vcpu_e500->mas3 = gtlbe->mas3;
 460         vcpu_e500->mas7 = gtlbe->mas7;
 461
 462         return EMULATE_DONE;
 463 }
 464
 465 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
 466 {
 467         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 468         int as = !!get_cur_sas(vcpu_e500);
 469         unsigned int pid = get_cur_spid(vcpu_e500);
 470         int esel, tlbsel;
 471         struct tlbe *gtlbe = NULL;
 472         gva_t ea;
 473
 474         ea = vcpu->arch.gpr[rb];
 475
 476         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
 477                 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
 478                 if (esel >= 0) {
 479                         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 480                         break;
 481                 }
 482         }
 483
 484         if (gtlbe) {
 485                 vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
 486                         | MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 487                 vcpu_e500->mas1 = gtlbe->mas1;
 488                 vcpu_e500->mas2 = gtlbe->mas2;
 489                 vcpu_e500->mas3 = gtlbe->mas3;
 490                 vcpu_e500->mas7 = gtlbe->mas7;
 491         } else {
 492                 int victim;
 493
 494                 /* since we only have two TLBs, only lower bit is used. */
 495                 tlbsel = vcpu_e500->mas4 >> 28 & 0x1;
 496                 victim = (tlbsel == 0) ? tlb0_get_next_victim(vcpu_e500) : 0;
 497
 498                 vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
 499                         | MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 500                 vcpu_e500->mas1 = (vcpu_e500->mas6 & MAS6_SPID0)
 501                         | (vcpu_e500->mas6 & (MAS6_SAS ? MAS1_TS : 0))
 502                         | (vcpu_e500->mas4 & MAS4_TSIZED(~0));
 503                 vcpu_e500->mas2 &= MAS2_EPN;
 504                 vcpu_e500->mas2 |= vcpu_e500->mas4 & MAS2_ATTRIB_MASK;
 505                 vcpu_e500->mas3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
 506                 vcpu_e500->mas7 = 0;
 507         }
 508
 509         return EMULATE_DONE;
 510 }
 511
 512 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
 513 {
 514         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 515         u64 eaddr;
 516         u64 raddr;
 517         u32 tid;
 518         struct tlbe *gtlbe;
 519         int tlbsel, esel, stlbsel, sesel;
 520
 521         tlbsel = get_tlb_tlbsel(vcpu_e500);
 522         esel = get_tlb_esel(vcpu_e500, tlbsel);
 523
 524         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 525
 526         if (get_tlb_v(gtlbe) && tlbsel == 1) {
 527                 eaddr = get_tlb_eaddr(gtlbe);
 528                 tid = get_tlb_tid(gtlbe);
 529                 kvmppc_e500_tlb1_invalidate(vcpu_e500, eaddr,
 530                                 get_tlb_end(gtlbe), tid);
 531         }
 532
 533         gtlbe->mas1 = vcpu_e500->mas1;
 534         gtlbe->mas2 = vcpu_e500->mas2;
 535         gtlbe->mas3 = vcpu_e500->mas3;
 536         gtlbe->mas7 = vcpu_e500->mas7;
 537
 538         KVMTRACE_5D(GTLB_WRITE, vcpu, vcpu_e500->mas0,
 539                         gtlbe->mas1, gtlbe->mas2, gtlbe->mas3, gtlbe->mas7,
 540                         handler);
 541
 542         /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
 543         if (tlbe_is_host_safe(vcpu, gtlbe)) {
 544                 switch (tlbsel) {
 545                 case 0:
 546                         /* TLB0 */
 547                         gtlbe->mas1 &= ~MAS1_TSIZE(~0);
 548                         gtlbe->mas1 |= MAS1_TSIZE(BOOKE_PAGESZ_4K);
 549
 550                         stlbsel = 0;
 551                         sesel = kvmppc_e500_stlbe_map(vcpu_e500, 0, esel);
 552
 553                         break;
 554
 555                 case 1:
 556                         /* TLB1 */
 557                         eaddr = get_tlb_eaddr(gtlbe);
 558                         raddr = get_tlb_raddr(gtlbe);
 559
 560                         /* Create a 4KB mapping on the host.
 561                          * If the guest wanted a large page,
 562                          * only the first 4KB is mapped here and the rest
 563                          * are mapped on the fly. */
 564                         stlbsel = 1;
 565                         sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr,
 566                                         raddr >> PAGE_SHIFT, gtlbe);
 567                         break;
 568
 569                 default:
 570                         BUG();
 571                 }
 572                 write_host_tlbe(vcpu_e500, stlbsel, sesel);
 573         }
 574
 575         return EMULATE_DONE;
 576 }
 577
 578 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
 579 {
 580         unsigned int as = !!(vcpu->arch.msr & MSR_IS);
 581
 582         return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
 583 }
 584
 585 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
 586 {
 587         unsigned int as = !!(vcpu->arch.msr & MSR_DS);
 588
 589         return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
 590 }
 591
 592 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
 593 {
 594         unsigned int as = !!(vcpu->arch.msr & MSR_IS);
 595
 596         kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
 597 }
 598
 599 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
 600 {
 601         unsigned int as = !!(vcpu->arch.msr & MSR_DS);
 602
 603         kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
 604 }
 605
 606 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
 607                         gva_t eaddr)
 608 {
 609         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 610         struct tlbe *gtlbe =
 611                 &vcpu_e500->guest_tlb[tlbsel_of(index)][esel_of(index)];
 612         u64 pgmask = get_tlb_bytes(gtlbe) - 1;
 613
 614         return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
 615 }
 616
 617 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
 618 {
 619         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 620         int tlbsel, i;
 621
 622         for (tlbsel = 0; tlbsel < 2; tlbsel++)
 623                 for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++)
 624                         kvmppc_e500_shadow_release(vcpu_e500, tlbsel, i);
 625
 626         /* discard all guest mapping */
 627         _tlbil_all();
 628 }
 629
 630 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
 631                         unsigned int index)
 632 {
 633         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 634         int tlbsel = tlbsel_of(index);
 635         int esel = esel_of(index);
 636         int stlbsel, sesel;
 637
 638         switch (tlbsel) {
 639         case 0:
 640                 stlbsel = 0;
 641                 sesel = esel;
 642                 break;
 643
 644         case 1: {
 645                 gfn_t gfn = gpaddr >> PAGE_SHIFT;
 646                 struct tlbe *gtlbe
 647                         = &vcpu_e500->guest_tlb[tlbsel][esel];
 648
 649                 stlbsel = 1;
 650                 sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe);
 651                 break;
 652         }
 653
 654         default:
 655                 BUG();
 656                 break;
 657         }
 658         write_host_tlbe(vcpu_e500, stlbsel, sesel);
 659 }
 660
 661 int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
 662                                 gva_t eaddr, unsigned int pid, int as)
 663 {
 664         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 665         int esel, tlbsel;
 666
 667         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
 668                 esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
 669                 if (esel >= 0)
 670                         return index_of(tlbsel, esel);
 671         }
 672
 673         return -1;
 674 }
 675
 676 void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500)
 677 {
 678         struct tlbe *tlbe;
 679
 680         /* Insert large initial mapping for guest. */
 681         tlbe = &vcpu_e500->guest_tlb[1][0];
 682         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOKE_PAGESZ_256M);
 683         tlbe->mas2 = 0;
 684         tlbe->mas3 = E500_TLB_SUPER_PERM_MASK;
 685         tlbe->mas7 = 0;
 686
 687         /* 4K map for serial output. Used by kernel wrapper. */
 688         tlbe = &vcpu_e500->guest_tlb[1][1];
 689         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOKE_PAGESZ_4K);
 690         tlbe->mas2 = (0xe0004500 & 0xFFFFF000) | MAS2_I | MAS2_G;
 691         tlbe->mas3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK;
 692         tlbe->mas7 = 0;
 693 }
 694
 695 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
 696 {
 697         tlb1_entry_num = mfspr(SPRN_TLB1CFG) & 0xFFF;
 698
 699         vcpu_e500->guest_tlb_size[0] = KVM_E500_TLB0_SIZE;
 700         vcpu_e500->guest_tlb[0] =
 701                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 702         if (vcpu_e500->guest_tlb[0] == NULL)
 703                 goto err_out;
 704
 705         vcpu_e500->shadow_tlb_size[0] = KVM_E500_TLB0_SIZE;
 706         vcpu_e500->shadow_tlb[0] =
 707                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 708         if (vcpu_e500->shadow_tlb[0] == NULL)
 709                 goto err_out_guest0;
 710
 711         vcpu_e500->guest_tlb_size[1] = KVM_E500_TLB1_SIZE;
 712         vcpu_e500->guest_tlb[1] =
 713                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB1_SIZE, GFP_KERNEL);
 714         if (vcpu_e500->guest_tlb[1] == NULL)
 715                 goto err_out_shadow0;
 716
 717         vcpu_e500->shadow_tlb_size[1] = tlb1_entry_num;
 718         vcpu_e500->shadow_tlb[1] =
 719                 kzalloc(sizeof(struct tlbe) * tlb1_entry_num, GFP_KERNEL);
 720         if (vcpu_e500->shadow_tlb[1] == NULL)
 721                 goto err_out_guest1;
 722
 723         vcpu_e500->shadow_pages[0] = (struct page **)
 724                 kzalloc(sizeof(struct page *) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 725         if (vcpu_e500->shadow_pages[0] == NULL)
 726                 goto err_out_shadow1;
 727
 728         vcpu_e500->shadow_pages[1] = (struct page **)
 729                 kzalloc(sizeof(struct page *) * tlb1_entry_num, GFP_KERNEL);
 730         if (vcpu_e500->shadow_pages[1] == NULL)
 731                 goto err_out_page0;
 732
 733         return 0;
 734
 735 err_out_page0:
 736         kfree(vcpu_e500->shadow_pages[0]);
 737 err_out_shadow1:
 738         kfree(vcpu_e500->shadow_tlb[1]);
 739 err_out_guest1:
 740         kfree(vcpu_e500->guest_tlb[1]);
 741 err_out_shadow0:
 742         kfree(vcpu_e500->shadow_tlb[0]);
 743 err_out_guest0:
 744         kfree(vcpu_e500->guest_tlb[0]);
 745 err_out:
 746         return -1;
 747 }
 748
 749 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
 750 {
 751         kfree(vcpu_e500->shadow_pages[1]);
 752         kfree(vcpu_e500->shadow_pages[0]);
 753         kfree(vcpu_e500->shadow_tlb[1]);
 754         kfree(vcpu_e500->guest_tlb[1]);
 755         kfree(vcpu_e500->shadow_tlb[0]);
 756         kfree(vcpu_e500->guest_tlb[0]);
 757 }