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 #include "trace.h"
  26
  27 #define to_htlb1_esel(esel) (tlb1_entry_num - (esel) - 1)
  28
  29 static unsigned int tlb1_entry_num;
  30
  31 void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
  32 {
  33         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
  34         struct tlbe *tlbe;
  35         int i, tlbsel;
  36
  37         printk("| %8s | %8s | %8s | %8s | %8s |\n",
  38                         "nr", "mas1", "mas2", "mas3", "mas7");
  39
  40         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
  41                 printk("Guest TLB%d:\n", tlbsel);
  42                 for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++) {
  43                         tlbe = &vcpu_e500->guest_tlb[tlbsel][i];
  44                         if (tlbe->mas1 & MAS1_VALID)
  45                                 printk(" G[%d][%3d] |  %08X | %08X | %08X | %08X |\n",
  46                                         tlbsel, i, tlbe->mas1, tlbe->mas2,
  47                                         tlbe->mas3, tlbe->mas7);
  48                 }
  49         }
  50
  51         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
  52                 printk("Shadow TLB%d:\n", tlbsel);
  53                 for (i = 0; i < vcpu_e500->shadow_tlb_size[tlbsel]; i++) {
  54                         tlbe = &vcpu_e500->shadow_tlb[tlbsel][i];
  55                         if (tlbe->mas1 & MAS1_VALID)
  56                                 printk(" S[%d][%3d] |  %08X | %08X | %08X | %08X |\n",
  57                                         tlbsel, i, tlbe->mas1, tlbe->mas2,
  58                                         tlbe->mas3, tlbe->mas7);
  59                 }
  60         }
  61 }
  62
  63 static inline unsigned int tlb0_get_next_victim(
  64                 struct kvmppc_vcpu_e500 *vcpu_e500)
  65 {
  66         unsigned int victim;
  67
  68         victim = vcpu_e500->guest_tlb_nv[0]++;
  69         if (unlikely(vcpu_e500->guest_tlb_nv[0] >= KVM_E500_TLB0_WAY_NUM))
  70                 vcpu_e500->guest_tlb_nv[0] = 0;
  71
  72         return victim;
  73 }
  74
  75 static inline unsigned int tlb1_max_shadow_size(void)
  76 {
  77         return tlb1_entry_num - tlbcam_index;
  78 }
  79
  80 static inline int tlbe_is_writable(struct tlbe *tlbe)
  81 {
  82         return tlbe->mas3 & (MAS3_SW|MAS3_UW);
  83 }
  84
  85 static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
  86 {
  87         /* Mask off reserved bits. */
  88         mas3 &= MAS3_ATTRIB_MASK;
  89
  90         if (!usermode) {
  91                 /* Guest is in supervisor mode,
  92                  * so we need to translate guest
  93                  * supervisor permissions into user permissions. */
  94                 mas3 &= ~E500_TLB_USER_PERM_MASK;
  95                 mas3 |= (mas3 & E500_TLB_SUPER_PERM_MASK) << 1;
  96         }
  97
  98         return mas3 | E500_TLB_SUPER_PERM_MASK;
  99 }
 100
 101 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
 102 {
 103 #ifdef CONFIG_SMP
 104         return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
 105 #else
 106         return mas2 & MAS2_ATTRIB_MASK;
 107 #endif
 108 }
 109
 110 /*
 111  * writing shadow tlb entry to host TLB
 112  */
 113 static inline void __write_host_tlbe(struct tlbe *stlbe)
 114 {
 115         mtspr(SPRN_MAS1, stlbe->mas1);
 116         mtspr(SPRN_MAS2, stlbe->mas2);
 117         mtspr(SPRN_MAS3, stlbe->mas3);
 118         mtspr(SPRN_MAS7, stlbe->mas7);
 119         __asm__ __volatile__ ("tlbwe\n" : : );
 120 }
 121
 122 static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
 123                 int tlbsel, int esel)
 124 {
 125         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 126
 127         local_irq_disable();
 128         if (tlbsel == 0) {
 129                 __write_host_tlbe(stlbe);
 130         } else {
 131                 unsigned register mas0;
 132
 133                 mas0 = mfspr(SPRN_MAS0);
 134
 135                 mtspr(SPRN_MAS0, MAS0_TLBSEL(1) | MAS0_ESEL(to_htlb1_esel(esel)));
 136                 __write_host_tlbe(stlbe);
 137
 138                 mtspr(SPRN_MAS0, mas0);
 139         }
 140         local_irq_enable();
 141 }
 142
 143 void kvmppc_e500_tlb_load(struct kvm_vcpu *vcpu, int cpu)
 144 {
 145         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 146         int i;
 147         unsigned register mas0;
 148
 149         /* Load all valid TLB1 entries to reduce guest tlb miss fault */
 150         local_irq_disable();
 151         mas0 = mfspr(SPRN_MAS0);
 152         for (i = 0; i < tlb1_max_shadow_size(); i++) {
 153                 struct tlbe *stlbe = &vcpu_e500->shadow_tlb[1][i];
 154
 155                 if (get_tlb_v(stlbe)) {
 156                         mtspr(SPRN_MAS0, MAS0_TLBSEL(1)
 157                                         | MAS0_ESEL(to_htlb1_esel(i)));
 158                         __write_host_tlbe(stlbe);
 159                 }
 160         }
 161         mtspr(SPRN_MAS0, mas0);
 162         local_irq_enable();
 163 }
 164
 165 void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu)
 166 {
 167         _tlbil_all();
 168 }
 169
 170 /* Search the guest TLB for a matching entry. */
 171 static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
 172                 gva_t eaddr, int tlbsel, unsigned int pid, int as)
 173 {
 174         int i;
 175
 176         /* XXX Replace loop with fancy data structures. */
 177         for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++) {
 178                 struct tlbe *tlbe = &vcpu_e500->guest_tlb[tlbsel][i];
 179                 unsigned int tid;
 180
 181                 if (eaddr < get_tlb_eaddr(tlbe))
 182                         continue;
 183
 184                 if (eaddr > get_tlb_end(tlbe))
 185                         continue;
 186
 187                 tid = get_tlb_tid(tlbe);
 188                 if (tid && (tid != pid))
 189                         continue;
 190
 191                 if (!get_tlb_v(tlbe))
 192                         continue;
 193
 194                 if (get_tlb_ts(tlbe) != as && as != -1)
 195                         continue;
 196
 197                 return i;
 198         }
 199
 200         return -1;
 201 }
 202
 203 static void kvmppc_e500_shadow_release(struct kvmppc_vcpu_e500 *vcpu_e500,
 204                 int tlbsel, int esel)
 205 {
 206         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 207         struct page *page = vcpu_e500->shadow_pages[tlbsel][esel];
 208
 209         if (page) {
 210                 vcpu_e500->shadow_pages[tlbsel][esel] = NULL;
 211
 212                 if (get_tlb_v(stlbe)) {
 213                         if (tlbe_is_writable(stlbe))
 214                                 kvm_release_page_dirty(page);
 215                         else
 216                                 kvm_release_page_clean(page);
 217                 }
 218         }
 219 }
 220
 221 static void kvmppc_e500_stlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
 222                 int tlbsel, int esel)
 223 {
 224         struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 225
 226         kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
 227         stlbe->mas1 = 0;
 228         trace_kvm_stlb_inval(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2,
 229                              stlbe->mas3, stlbe->mas7);
 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 >> 7) & 0x1f;
 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(BOOK3E_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         trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2,
 323                              stlbe->mas3, stlbe->mas7);
 324 }
 325
 326 /* XXX only map the one-one case, for now use TLB0 */
 327 static int kvmppc_e500_stlbe_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 328                 int tlbsel, int esel)
 329 {
 330         struct tlbe *gtlbe;
 331
 332         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 333
 334         kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
 335                         get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
 336                         gtlbe, tlbsel, esel);
 337
 338         return esel;
 339 }
 340
 341 /* Caller must ensure that the specified guest TLB entry is safe to insert into
 342  * the shadow TLB. */
 343 /* XXX for both one-one and one-to-many , for now use TLB1 */
 344 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 345                 u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe)
 346 {
 347         unsigned int victim;
 348
 349         victim = vcpu_e500->guest_tlb_nv[1]++;
 350
 351         if (unlikely(vcpu_e500->guest_tlb_nv[1] >= tlb1_max_shadow_size()))
 352                 vcpu_e500->guest_tlb_nv[1] = 0;
 353
 354         kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, victim);
 355
 356         return victim;
 357 }
 358
 359 /* Invalidate all guest kernel mappings when enter usermode,
 360  * so that when they fault back in they will get the
 361  * proper permission bits. */
 362 void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode)
 363 {
 364         if (usermode) {
 365                 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 366                 int i;
 367
 368                 /* XXX Replace loop with fancy data structures. */
 369                 for (i = 0; i < tlb1_max_shadow_size(); i++)
 370                         kvmppc_e500_stlbe_invalidate(vcpu_e500, 1, i);
 371
 372                 _tlbil_all();
 373         }
 374 }
 375
 376 static int kvmppc_e500_gtlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
 377                 int tlbsel, int esel)
 378 {
 379         struct tlbe *gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 380
 381         if (unlikely(get_tlb_iprot(gtlbe)))
 382                 return -1;
 383
 384         if (tlbsel == 1) {
 385                 kvmppc_e500_tlb1_invalidate(vcpu_e500, get_tlb_eaddr(gtlbe),
 386                                 get_tlb_end(gtlbe),
 387                                 get_tlb_tid(gtlbe));
 388         } else {
 389                 kvmppc_e500_stlbe_invalidate(vcpu_e500, tlbsel, esel);
 390         }
 391
 392         gtlbe->mas1 = 0;
 393
 394         return 0;
 395 }
 396
 397 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
 398 {
 399         int esel;
 400
 401         if (value & MMUCSR0_TLB0FI)
 402                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[0]; esel++)
 403                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
 404         if (value & MMUCSR0_TLB1FI)
 405                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[1]; esel++)
 406                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
 407
 408         _tlbil_all();
 409
 410         return EMULATE_DONE;
 411 }
 412
 413 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb)
 414 {
 415         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 416         unsigned int ia;
 417         int esel, tlbsel;
 418         gva_t ea;
 419
 420         ea = ((ra) ? vcpu->arch.gpr[ra] : 0) + vcpu->arch.gpr[rb];
 421
 422         ia = (ea >> 2) & 0x1;
 423
 424         /* since we only have two TLBs, only lower bit is used. */
 425         tlbsel = (ea >> 3) & 0x1;
 426
 427         if (ia) {
 428                 /* invalidate all entries */
 429                 for (esel = 0; esel < vcpu_e500->guest_tlb_size[tlbsel]; esel++)
 430                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
 431         } else {
 432                 ea &= 0xfffff000;
 433                 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
 434                                 get_cur_pid(vcpu), -1);
 435                 if (esel >= 0)
 436                         kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
 437         }
 438
 439         _tlbil_all();
 440
 441         return EMULATE_DONE;
 442 }
 443
 444 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
 445 {
 446         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 447         int tlbsel, esel;
 448         struct tlbe *gtlbe;
 449
 450         tlbsel = get_tlb_tlbsel(vcpu_e500);
 451         esel = get_tlb_esel(vcpu_e500, tlbsel);
 452
 453         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 454         vcpu_e500->mas0 &= ~MAS0_NV(~0);
 455         vcpu_e500->mas0 |= MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 456         vcpu_e500->mas1 = gtlbe->mas1;
 457         vcpu_e500->mas2 = gtlbe->mas2;
 458         vcpu_e500->mas3 = gtlbe->mas3;
 459         vcpu_e500->mas7 = gtlbe->mas7;
 460
 461         return EMULATE_DONE;
 462 }
 463
 464 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
 465 {
 466         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 467         int as = !!get_cur_sas(vcpu_e500);
 468         unsigned int pid = get_cur_spid(vcpu_e500);
 469         int esel, tlbsel;
 470         struct tlbe *gtlbe = NULL;
 471         gva_t ea;
 472
 473         ea = vcpu->arch.gpr[rb];
 474
 475         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
 476                 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
 477                 if (esel >= 0) {
 478                         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 479                         break;
 480                 }
 481         }
 482
 483         if (gtlbe) {
 484                 vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
 485                         | MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 486                 vcpu_e500->mas1 = gtlbe->mas1;
 487                 vcpu_e500->mas2 = gtlbe->mas2;
 488                 vcpu_e500->mas3 = gtlbe->mas3;
 489                 vcpu_e500->mas7 = gtlbe->mas7;
 490         } else {
 491                 int victim;
 492
 493                 /* since we only have two TLBs, only lower bit is used. */
 494                 tlbsel = vcpu_e500->mas4 >> 28 & 0x1;
 495                 victim = (tlbsel == 0) ? tlb0_get_next_victim(vcpu_e500) : 0;
 496
 497                 vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
 498                         | MAS0_NV(vcpu_e500->guest_tlb_nv[tlbsel]);
 499                 vcpu_e500->mas1 = (vcpu_e500->mas6 & MAS6_SPID0)
 500                         | (vcpu_e500->mas6 & (MAS6_SAS ? MAS1_TS : 0))
 501                         | (vcpu_e500->mas4 & MAS4_TSIZED(~0));
 502                 vcpu_e500->mas2 &= MAS2_EPN;
 503                 vcpu_e500->mas2 |= vcpu_e500->mas4 & MAS2_ATTRIB_MASK;
 504                 vcpu_e500->mas3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
 505                 vcpu_e500->mas7 = 0;
 506         }
 507
 508         return EMULATE_DONE;
 509 }
 510
 511 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
 512 {
 513         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 514         u64 eaddr;
 515         u64 raddr;
 516         u32 tid;
 517         struct tlbe *gtlbe;
 518         int tlbsel, esel, stlbsel, sesel;
 519
 520         tlbsel = get_tlb_tlbsel(vcpu_e500);
 521         esel = get_tlb_esel(vcpu_e500, tlbsel);
 522
 523         gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
 524
 525         if (get_tlb_v(gtlbe) && tlbsel == 1) {
 526                 eaddr = get_tlb_eaddr(gtlbe);
 527                 tid = get_tlb_tid(gtlbe);
 528                 kvmppc_e500_tlb1_invalidate(vcpu_e500, eaddr,
 529                                 get_tlb_end(gtlbe), tid);
 530         }
 531
 532         gtlbe->mas1 = vcpu_e500->mas1;
 533         gtlbe->mas2 = vcpu_e500->mas2;
 534         gtlbe->mas3 = vcpu_e500->mas3;
 535         gtlbe->mas7 = vcpu_e500->mas7;
 536
 537         trace_kvm_gtlb_write(vcpu_e500->mas0, gtlbe->mas1, gtlbe->mas2,
 538                              gtlbe->mas3, gtlbe->mas7);
 539
 540         /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
 541         if (tlbe_is_host_safe(vcpu, gtlbe)) {
 542                 switch (tlbsel) {
 543                 case 0:
 544                         /* TLB0 */
 545                         gtlbe->mas1 &= ~MAS1_TSIZE(~0);
 546                         gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
 547
 548                         stlbsel = 0;
 549                         sesel = kvmppc_e500_stlbe_map(vcpu_e500, 0, esel);
 550
 551                         break;
 552
 553                 case 1:
 554                         /* TLB1 */
 555                         eaddr = get_tlb_eaddr(gtlbe);
 556                         raddr = get_tlb_raddr(gtlbe);
 557
 558                         /* Create a 4KB mapping on the host.
 559                          * If the guest wanted a large page,
 560                          * only the first 4KB is mapped here and the rest
 561                          * are mapped on the fly. */
 562                         stlbsel = 1;
 563                         sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr,
 564                                         raddr >> PAGE_SHIFT, gtlbe);
 565                         break;
 566
 567                 default:
 568                         BUG();
 569                 }
 570                 write_host_tlbe(vcpu_e500, stlbsel, sesel);
 571         }
 572
 573         return EMULATE_DONE;
 574 }
 575
 576 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
 577 {
 578         unsigned int as = !!(vcpu->arch.msr & MSR_IS);
 579
 580         return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
 581 }
 582
 583 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
 584 {
 585         unsigned int as = !!(vcpu->arch.msr & MSR_DS);
 586
 587         return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
 588 }
 589
 590 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
 591 {
 592         unsigned int as = !!(vcpu->arch.msr & MSR_IS);
 593
 594         kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
 595 }
 596
 597 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
 598 {
 599         unsigned int as = !!(vcpu->arch.msr & MSR_DS);
 600
 601         kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
 602 }
 603
 604 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
 605                         gva_t eaddr)
 606 {
 607         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 608         struct tlbe *gtlbe =
 609                 &vcpu_e500->guest_tlb[tlbsel_of(index)][esel_of(index)];
 610         u64 pgmask = get_tlb_bytes(gtlbe) - 1;
 611
 612         return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
 613 }
 614
 615 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
 616 {
 617         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 618         int tlbsel, i;
 619
 620         for (tlbsel = 0; tlbsel < 2; tlbsel++)
 621                 for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++)
 622                         kvmppc_e500_shadow_release(vcpu_e500, tlbsel, i);
 623
 624         /* discard all guest mapping */
 625         _tlbil_all();
 626 }
 627
 628 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
 629                         unsigned int index)
 630 {
 631         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 632         int tlbsel = tlbsel_of(index);
 633         int esel = esel_of(index);
 634         int stlbsel, sesel;
 635
 636         switch (tlbsel) {
 637         case 0:
 638                 stlbsel = 0;
 639                 sesel = esel;
 640                 break;
 641
 642         case 1: {
 643                 gfn_t gfn = gpaddr >> PAGE_SHIFT;
 644                 struct tlbe *gtlbe
 645                         = &vcpu_e500->guest_tlb[tlbsel][esel];
 646
 647                 stlbsel = 1;
 648                 sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe);
 649                 break;
 650         }
 651
 652         default:
 653                 BUG();
 654                 break;
 655         }
 656         write_host_tlbe(vcpu_e500, stlbsel, sesel);
 657 }
 658
 659 int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
 660                                 gva_t eaddr, unsigned int pid, int as)
 661 {
 662         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 663         int esel, tlbsel;
 664
 665         for (tlbsel = 0; tlbsel < 2; tlbsel++) {
 666                 esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
 667                 if (esel >= 0)
 668                         return index_of(tlbsel, esel);
 669         }
 670
 671         return -1;
 672 }
 673
 674 void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500)
 675 {
 676         struct tlbe *tlbe;
 677
 678         /* Insert large initial mapping for guest. */
 679         tlbe = &vcpu_e500->guest_tlb[1][0];
 680         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_256M);
 681         tlbe->mas2 = 0;
 682         tlbe->mas3 = E500_TLB_SUPER_PERM_MASK;
 683         tlbe->mas7 = 0;
 684
 685         /* 4K map for serial output. Used by kernel wrapper. */
 686         tlbe = &vcpu_e500->guest_tlb[1][1];
 687         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_4K);
 688         tlbe->mas2 = (0xe0004500 & 0xFFFFF000) | MAS2_I | MAS2_G;
 689         tlbe->mas3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK;
 690         tlbe->mas7 = 0;
 691 }
 692
 693 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
 694 {
 695         tlb1_entry_num = mfspr(SPRN_TLB1CFG) & 0xFFF;
 696
 697         vcpu_e500->guest_tlb_size[0] = KVM_E500_TLB0_SIZE;
 698         vcpu_e500->guest_tlb[0] =
 699                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 700         if (vcpu_e500->guest_tlb[0] == NULL)
 701                 goto err_out;
 702
 703         vcpu_e500->shadow_tlb_size[0] = KVM_E500_TLB0_SIZE;
 704         vcpu_e500->shadow_tlb[0] =
 705                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 706         if (vcpu_e500->shadow_tlb[0] == NULL)
 707                 goto err_out_guest0;
 708
 709         vcpu_e500->guest_tlb_size[1] = KVM_E500_TLB1_SIZE;
 710         vcpu_e500->guest_tlb[1] =
 711                 kzalloc(sizeof(struct tlbe) * KVM_E500_TLB1_SIZE, GFP_KERNEL);
 712         if (vcpu_e500->guest_tlb[1] == NULL)
 713                 goto err_out_shadow0;
 714
 715         vcpu_e500->shadow_tlb_size[1] = tlb1_entry_num;
 716         vcpu_e500->shadow_tlb[1] =
 717                 kzalloc(sizeof(struct tlbe) * tlb1_entry_num, GFP_KERNEL);
 718         if (vcpu_e500->shadow_tlb[1] == NULL)
 719                 goto err_out_guest1;
 720
 721         vcpu_e500->shadow_pages[0] = (struct page **)
 722                 kzalloc(sizeof(struct page *) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
 723         if (vcpu_e500->shadow_pages[0] == NULL)
 724                 goto err_out_shadow1;
 725
 726         vcpu_e500->shadow_pages[1] = (struct page **)
 727                 kzalloc(sizeof(struct page *) * tlb1_entry_num, GFP_KERNEL);
 728         if (vcpu_e500->shadow_pages[1] == NULL)
 729                 goto err_out_page0;
 730
 731         return 0;
 732
 733 err_out_page0:
 734         kfree(vcpu_e500->shadow_pages[0]);
 735 err_out_shadow1:
 736         kfree(vcpu_e500->shadow_tlb[1]);
 737 err_out_guest1:
 738         kfree(vcpu_e500->guest_tlb[1]);
 739 err_out_shadow0:
 740         kfree(vcpu_e500->shadow_tlb[0]);
 741 err_out_guest0:
 742         kfree(vcpu_e500->guest_tlb[0]);
 743 err_out:
 744         return -1;
 745 }
 746
 747 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
 748 {
 749         kfree(vcpu_e500->shadow_pages[1]);
 750         kfree(vcpu_e500->shadow_pages[0]);
 751         kfree(vcpu_e500->shadow_tlb[1]);
 752         kfree(vcpu_e500->guest_tlb[1]);
 753         kfree(vcpu_e500->shadow_tlb[0]);
 754         kfree(vcpu_e500->guest_tlb[0]);
 755 }