arch/mips/kvm/kvm_tlb.c

   1 /*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that
   7 * TLB handlers run from KSEG0
   8 *
   9 * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
  10 * Authors: Sanjay Lal <sanjayl@kymasys.com>
  11 */
  12
  13 #include <linux/sched.h>
  14 #include <linux/smp.h>
  15 #include <linux/mm.h>
  16 #include <linux/delay.h>
  17 #include <linux/module.h>
  18 #include <linux/kvm_host.h>
  19 #include <linux/srcu.h>
  20
  21
  22 #include <asm/cpu.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/mmu_context.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/tlb.h>
  28
  29 #undef CONFIG_MIPS_MT
  30 #include <asm/r4kcache.h>
  31 #define CONFIG_MIPS_MT
  32
  33 #define KVM_GUEST_PC_TLB    0
  34 #define KVM_GUEST_SP_TLB    1
  35
  36 #define PRIx64 "llx"
  37
  38 atomic_t kvm_mips_instance;
  39 EXPORT_SYMBOL(kvm_mips_instance);
  40
  41 /* These function pointers are initialized once the KVM module is loaded */
  42 pfn_t(*kvm_mips_gfn_to_pfn) (struct kvm *kvm, gfn_t gfn);
  43 EXPORT_SYMBOL(kvm_mips_gfn_to_pfn);
  44
  45 void (*kvm_mips_release_pfn_clean) (pfn_t pfn);
  46 EXPORT_SYMBOL(kvm_mips_release_pfn_clean);
  47
  48 bool(*kvm_mips_is_error_pfn) (pfn_t pfn);
  49 EXPORT_SYMBOL(kvm_mips_is_error_pfn);
  50
  51 uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
  52 {
  53         return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK;
  54 }
  55
  56
  57 uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
  58 {
  59         return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK;
  60 }
  61
  62 inline uint32_t kvm_mips_get_commpage_asid (struct kvm_vcpu *vcpu)
  63 {
  64         return vcpu->kvm->arch.commpage_tlb;
  65 }
  66
  67
  68 /*
  69  * Structure defining an tlb entry data set.
  70  */
  71
  72 void kvm_mips_dump_host_tlbs(void)
  73 {
  74         unsigned long old_entryhi;
  75         unsigned long old_pagemask;
  76         struct kvm_mips_tlb tlb;
  77         unsigned long flags;
  78         int i;
  79
  80         local_irq_save(flags);
  81
  82         old_entryhi = read_c0_entryhi();
  83         old_pagemask = read_c0_pagemask();
  84
  85         printk("HOST TLBs:\n");
  86         printk("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK);
  87
  88         for (i = 0; i < current_cpu_data.tlbsize; i++) {
  89                 write_c0_index(i);
  90                 mtc0_tlbw_hazard();
  91
  92                 tlb_read();
  93                 tlbw_use_hazard();
  94
  95                 tlb.tlb_hi = read_c0_entryhi();
  96                 tlb.tlb_lo0 = read_c0_entrylo0();
  97                 tlb.tlb_lo1 = read_c0_entrylo1();
  98                 tlb.tlb_mask = read_c0_pagemask();
  99
 100                 printk("TLB%c%3d Hi 0x%08lx ",
 101                        (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
 102                        i, tlb.tlb_hi);
 103                 printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
 104                        (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
 105                        (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
 106                        (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
 107                        (tlb.tlb_lo0 >> 3) & 7);
 108                 printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
 109                        (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
 110                        (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
 111                        (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
 112                        (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
 113         }
 114         write_c0_entryhi(old_entryhi);
 115         write_c0_pagemask(old_pagemask);
 116         mtc0_tlbw_hazard();
 117         local_irq_restore(flags);
 118 }
 119
 120 void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
 121 {
 122         struct mips_coproc *cop0 = vcpu->arch.cop0;
 123         struct kvm_mips_tlb tlb;
 124         int i;
 125
 126         printk("Guest TLBs:\n");
 127         printk("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0));
 128
 129         for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
 130                 tlb = vcpu->arch.guest_tlb[i];
 131                 printk("TLB%c%3d Hi 0x%08lx ",
 132                        (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
 133                        i, tlb.tlb_hi);
 134                 printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
 135                        (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
 136                        (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
 137                        (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
 138                        (tlb.tlb_lo0 >> 3) & 7);
 139                 printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
 140                        (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
 141                        (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
 142                        (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
 143                        (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
 144         }
 145 }
 146
 147 static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
 148 {
 149         int srcu_idx, err = 0;
 150         pfn_t pfn;
 151
 152         if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
 153                 return 0;
 154
 155         srcu_idx = srcu_read_lock(&kvm->srcu);
 156         pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
 157
 158         if (kvm_mips_is_error_pfn(pfn)) {
 159                 kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn);
 160                 err = -EFAULT;
 161                 goto out;
 162         }
 163
 164         kvm->arch.guest_pmap[gfn] = pfn;
 165 out:
 166         srcu_read_unlock(&kvm->srcu, srcu_idx);
 167         return err;
 168 }
 169
 170 /* Translate guest KSEG0 addresses to Host PA */
 171 unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
 172         unsigned long gva)
 173 {
 174         gfn_t gfn;
 175         uint32_t offset = gva & ~PAGE_MASK;
 176         struct kvm *kvm = vcpu->kvm;
 177
 178         if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
 179                 kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
 180                         __builtin_return_address(0), gva);
 181                 return KVM_INVALID_PAGE;
 182         }
 183
 184         gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
 185
 186         if (gfn >= kvm->arch.guest_pmap_npages) {
 187                 kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
 188                         gva);
 189                 return KVM_INVALID_PAGE;
 190         }
 191
 192         if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
 193                 return KVM_INVALID_ADDR;
 194
 195         return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
 196 }
 197
 198 /* XXXKYMA: Must be called with interrupts disabled */
 199 /* set flush_dcache_mask == 0 if no dcache flush required */
 200 int
 201 kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
 202         unsigned long entrylo0, unsigned long entrylo1, int flush_dcache_mask)
 203 {
 204         unsigned long flags;
 205         unsigned long old_entryhi;
 206         volatile int idx;
 207
 208         local_irq_save(flags);
 209
 210
 211         old_entryhi = read_c0_entryhi();
 212         write_c0_entryhi(entryhi);
 213         mtc0_tlbw_hazard();
 214
 215         tlb_probe();
 216         tlb_probe_hazard();
 217         idx = read_c0_index();
 218
 219         if (idx > current_cpu_data.tlbsize) {
 220                 kvm_err("%s: Invalid Index: %d\n", __func__, idx);
 221                 kvm_mips_dump_host_tlbs();
 222                 return -1;
 223         }
 224
 225         if (idx < 0) {
 226                 idx = read_c0_random() % current_cpu_data.tlbsize;
 227                 write_c0_index(idx);
 228                 mtc0_tlbw_hazard();
 229         }
 230         write_c0_entrylo0(entrylo0);
 231         write_c0_entrylo1(entrylo1);
 232         mtc0_tlbw_hazard();
 233
 234         tlb_write_indexed();
 235         tlbw_use_hazard();
 236
 237 #ifdef DEBUG
 238         if (debug) {
 239                 kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] "
 240                           "entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
 241                           vcpu->arch.pc, idx, read_c0_entryhi(),
 242                           read_c0_entrylo0(), read_c0_entrylo1());
 243         }
 244 #endif
 245
 246         /* Flush D-cache */
 247         if (flush_dcache_mask) {
 248                 if (entrylo0 & MIPS3_PG_V) {
 249                         ++vcpu->stat.flush_dcache_exits;
 250                         flush_data_cache_page((entryhi & VPN2_MASK) & ~flush_dcache_mask);
 251                 }
 252                 if (entrylo1 & MIPS3_PG_V) {
 253                         ++vcpu->stat.flush_dcache_exits;
 254                         flush_data_cache_page(((entryhi & VPN2_MASK) & ~flush_dcache_mask) |
 255                                 (0x1 << PAGE_SHIFT));
 256                 }
 257         }
 258
 259         /* Restore old ASID */
 260         write_c0_entryhi(old_entryhi);
 261         mtc0_tlbw_hazard();
 262         tlbw_use_hazard();
 263         local_irq_restore(flags);
 264         return 0;
 265 }
 266
 267
 268 /* XXXKYMA: Must be called with interrupts disabled */
 269 int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
 270         struct kvm_vcpu *vcpu)
 271 {
 272         gfn_t gfn;
 273         pfn_t pfn0, pfn1;
 274         unsigned long vaddr = 0;
 275         unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
 276         int even;
 277         struct kvm *kvm = vcpu->kvm;
 278         const int flush_dcache_mask = 0;
 279
 280
 281         if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
 282                 kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
 283                 kvm_mips_dump_host_tlbs();
 284                 return -1;
 285         }
 286
 287         gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
 288         if (gfn >= kvm->arch.guest_pmap_npages) {
 289                 kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
 290                         gfn, badvaddr);
 291                 kvm_mips_dump_host_tlbs();
 292                 return -1;
 293         }
 294         even = !(gfn & 0x1);
 295         vaddr = badvaddr & (PAGE_MASK << 1);
 296
 297         if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
 298                 return -1;
 299
 300         if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
 301                 return -1;
 302
 303         if (even) {
 304                 pfn0 = kvm->arch.guest_pmap[gfn];
 305                 pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
 306         } else {
 307                 pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
 308                 pfn1 = kvm->arch.guest_pmap[gfn];
 309         }
 310
 311         entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
 312         entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
 313                         (0x1 << 1);
 314         entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
 315                         (0x1 << 1);
 316
 317         return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
 318                                        flush_dcache_mask);
 319 }
 320
 321 int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
 322         struct kvm_vcpu *vcpu)
 323 {
 324         pfn_t pfn0, pfn1;
 325         unsigned long flags, old_entryhi = 0, vaddr = 0;
 326         unsigned long entrylo0 = 0, entrylo1 = 0;
 327
 328
 329         pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT;
 330         pfn1 = 0;
 331         entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
 332                         (0x1 << 1);
 333         entrylo1 = 0;
 334
 335         local_irq_save(flags);
 336
 337         old_entryhi = read_c0_entryhi();
 338         vaddr = badvaddr & (PAGE_MASK << 1);
 339         write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
 340         mtc0_tlbw_hazard();
 341         write_c0_entrylo0(entrylo0);
 342         mtc0_tlbw_hazard();
 343         write_c0_entrylo1(entrylo1);
 344         mtc0_tlbw_hazard();
 345         write_c0_index(kvm_mips_get_commpage_asid(vcpu));
 346         mtc0_tlbw_hazard();
 347         tlb_write_indexed();
 348         mtc0_tlbw_hazard();
 349         tlbw_use_hazard();
 350
 351 #ifdef DEBUG
 352         kvm_debug ("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
 353              vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
 354              read_c0_entrylo0(), read_c0_entrylo1());
 355 #endif
 356
 357         /* Restore old ASID */
 358         write_c0_entryhi(old_entryhi);
 359         mtc0_tlbw_hazard();
 360         tlbw_use_hazard();
 361         local_irq_restore(flags);
 362
 363         return 0;
 364 }
 365
 366 int
 367 kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
 368         struct kvm_mips_tlb *tlb, unsigned long *hpa0, unsigned long *hpa1)
 369 {
 370         unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
 371         struct kvm *kvm = vcpu->kvm;
 372         pfn_t pfn0, pfn1;
 373
 374
 375         if ((tlb->tlb_hi & VPN2_MASK) == 0) {
 376                 pfn0 = 0;
 377                 pfn1 = 0;
 378         } else {
 379                 if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT) < 0)
 380                         return -1;
 381
 382                 if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT) < 0)
 383                         return -1;
 384
 385                 pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT];
 386                 pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT];
 387         }
 388
 389         if (hpa0)
 390                 *hpa0 = pfn0 << PAGE_SHIFT;
 391
 392         if (hpa1)
 393                 *hpa1 = pfn1 << PAGE_SHIFT;
 394
 395         /* Get attributes from the Guest TLB */
 396         entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
 397                         kvm_mips_get_kernel_asid(vcpu) : kvm_mips_get_user_asid(vcpu));
 398         entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
 399                         (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V);
 400         entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
 401                         (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V);
 402
 403 #ifdef DEBUG
 404         kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
 405                   tlb->tlb_lo0, tlb->tlb_lo1);
 406 #endif
 407
 408         return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
 409                                        tlb->tlb_mask);
 410 }
 411
 412 int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
 413 {
 414         int i;
 415         int index = -1;
 416         struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb;
 417
 418
 419         for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
 420                 if (((TLB_VPN2(tlb[i]) & ~tlb[i].tlb_mask) == ((entryhi & VPN2_MASK) & ~tlb[i].tlb_mask)) &&
 421                         (TLB_IS_GLOBAL(tlb[i]) || (TLB_ASID(tlb[i]) == (entryhi & ASID_MASK)))) {
 422                         index = i;
 423                         break;
 424                 }
 425         }
 426
 427 #ifdef DEBUG
 428         kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n",
 429                   __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1);
 430 #endif
 431
 432         return index;
 433 }
 434
 435 int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
 436 {
 437         unsigned long old_entryhi, flags;
 438         volatile int idx;
 439
 440
 441         local_irq_save(flags);
 442
 443         old_entryhi = read_c0_entryhi();
 444
 445         if (KVM_GUEST_KERNEL_MODE(vcpu))
 446                 write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_kernel_asid(vcpu));
 447         else {
 448                 write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
 449         }
 450
 451         mtc0_tlbw_hazard();
 452
 453         tlb_probe();
 454         tlb_probe_hazard();
 455         idx = read_c0_index();
 456
 457         /* Restore old ASID */
 458         write_c0_entryhi(old_entryhi);
 459         mtc0_tlbw_hazard();
 460         tlbw_use_hazard();
 461
 462         local_irq_restore(flags);
 463
 464 #ifdef DEBUG
 465         kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
 466 #endif
 467
 468         return idx;
 469 }
 470
 471 int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
 472 {
 473         int idx;
 474         unsigned long flags, old_entryhi;
 475
 476         local_irq_save(flags);
 477
 478
 479         old_entryhi = read_c0_entryhi();
 480
 481         write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
 482         mtc0_tlbw_hazard();
 483
 484         tlb_probe();
 485         tlb_probe_hazard();
 486         idx = read_c0_index();
 487
 488         if (idx >= current_cpu_data.tlbsize)
 489                 BUG();
 490
 491         if (idx > 0) {
 492                 write_c0_entryhi(UNIQUE_ENTRYHI(idx));
 493                 mtc0_tlbw_hazard();
 494
 495                 write_c0_entrylo0(0);
 496                 mtc0_tlbw_hazard();
 497
 498                 write_c0_entrylo1(0);
 499                 mtc0_tlbw_hazard();
 500
 501                 tlb_write_indexed();
 502                 mtc0_tlbw_hazard();
 503         }
 504
 505         write_c0_entryhi(old_entryhi);
 506         mtc0_tlbw_hazard();
 507         tlbw_use_hazard();
 508
 509         local_irq_restore(flags);
 510
 511 #ifdef DEBUG
 512         if (idx > 0) {
 513                 kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
 514                           (va & VPN2_MASK) | (vcpu->arch.asid_map[va & ASID_MASK] & ASID_MASK), idx);
 515         }
 516 #endif
 517
 518         return 0;
 519 }
 520
 521 /* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID*/
 522 int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index)
 523 {
 524         unsigned long flags, old_entryhi;
 525
 526         if (index >= current_cpu_data.tlbsize)
 527                 BUG();
 528
 529         local_irq_save(flags);
 530
 531
 532         old_entryhi = read_c0_entryhi();
 533
 534         write_c0_entryhi(UNIQUE_ENTRYHI(index));
 535         mtc0_tlbw_hazard();
 536
 537         write_c0_index(index);
 538         mtc0_tlbw_hazard();
 539
 540         write_c0_entrylo0(0);
 541         mtc0_tlbw_hazard();
 542
 543         write_c0_entrylo1(0);
 544         mtc0_tlbw_hazard();
 545
 546         tlb_write_indexed();
 547         mtc0_tlbw_hazard();
 548         tlbw_use_hazard();
 549
 550         write_c0_entryhi(old_entryhi);
 551         mtc0_tlbw_hazard();
 552         tlbw_use_hazard();
 553
 554         local_irq_restore(flags);
 555
 556         return 0;
 557 }
 558
 559 void kvm_mips_flush_host_tlb(int skip_kseg0)
 560 {
 561         unsigned long flags;
 562         unsigned long old_entryhi, entryhi;
 563         unsigned long old_pagemask;
 564         int entry = 0;
 565         int maxentry = current_cpu_data.tlbsize;
 566
 567
 568         local_irq_save(flags);
 569
 570         old_entryhi = read_c0_entryhi();
 571         old_pagemask = read_c0_pagemask();
 572
 573         /* Blast 'em all away. */
 574         for (entry = 0; entry < maxentry; entry++) {
 575
 576                 write_c0_index(entry);
 577                 mtc0_tlbw_hazard();
 578
 579                 if (skip_kseg0) {
 580                         tlb_read();
 581                         tlbw_use_hazard();
 582
 583                         entryhi = read_c0_entryhi();
 584
 585                         /* Don't blow away guest kernel entries */
 586                         if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) {
 587                                 continue;
 588                         }
 589                 }
 590
 591                 /* Make sure all entries differ. */
 592                 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
 593                 mtc0_tlbw_hazard();
 594                 write_c0_entrylo0(0);
 595                 mtc0_tlbw_hazard();
 596                 write_c0_entrylo1(0);
 597                 mtc0_tlbw_hazard();
 598
 599                 tlb_write_indexed();
 600                 mtc0_tlbw_hazard();
 601         }
 602
 603         tlbw_use_hazard();
 604
 605         write_c0_entryhi(old_entryhi);
 606         write_c0_pagemask(old_pagemask);
 607         mtc0_tlbw_hazard();
 608         tlbw_use_hazard();
 609
 610         local_irq_restore(flags);
 611 }
 612
 613 void
 614 kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
 615                         struct kvm_vcpu *vcpu)
 616 {
 617         unsigned long asid = asid_cache(cpu);
 618
 619         if (!((asid += ASID_INC) & ASID_MASK)) {
 620                 if (cpu_has_vtag_icache) {
 621                         flush_icache_all();
 622                 }
 623
 624                 kvm_local_flush_tlb_all();      /* start new asid cycle */
 625
 626                 if (!asid)      /* fix version if needed */
 627                         asid = ASID_FIRST_VERSION;
 628         }
 629
 630         cpu_context(cpu, mm) = asid_cache(cpu) = asid;
 631 }
 632
 633 void kvm_local_flush_tlb_all(void)
 634 {
 635         unsigned long flags;
 636         unsigned long old_ctx;
 637         int entry = 0;
 638
 639         local_irq_save(flags);
 640         /* Save old context and create impossible VPN2 value */
 641         old_ctx = read_c0_entryhi();
 642         write_c0_entrylo0(0);
 643         write_c0_entrylo1(0);
 644
 645         /* Blast 'em all away. */
 646         while (entry < current_cpu_data.tlbsize) {
 647                 /* Make sure all entries differ. */
 648                 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
 649                 write_c0_index(entry);
 650                 mtc0_tlbw_hazard();
 651                 tlb_write_indexed();
 652                 entry++;
 653         }
 654         tlbw_use_hazard();
 655         write_c0_entryhi(old_ctx);
 656         mtc0_tlbw_hazard();
 657
 658         local_irq_restore(flags);
 659 }
 660
 661 /* Restore ASID once we are scheduled back after preemption */
 662 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 663 {
 664         unsigned long flags;
 665         int newasid = 0;
 666
 667 #ifdef DEBUG
 668         kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
 669 #endif
 670
 671         /* Alocate new kernel and user ASIDs if needed */
 672
 673         local_irq_save(flags);
 674
 675         if (((vcpu->arch.
 676               guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) {
 677                 kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
 678                 vcpu->arch.guest_kernel_asid[cpu] =
 679                     vcpu->arch.guest_kernel_mm.context.asid[cpu];
 680                 kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
 681                 vcpu->arch.guest_user_asid[cpu] =
 682                     vcpu->arch.guest_user_mm.context.asid[cpu];
 683                 newasid++;
 684
 685                 kvm_info("[%d]: cpu_context: %#lx\n", cpu,
 686                          cpu_context(cpu, current->mm));
 687                 kvm_info("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
 688                          cpu, vcpu->arch.guest_kernel_asid[cpu]);
 689                 kvm_info("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
 690                          vcpu->arch.guest_user_asid[cpu]);
 691         }
 692
 693         if (vcpu->arch.last_sched_cpu != cpu) {
 694                 kvm_info("[%d->%d]KVM VCPU[%d] switch\n",
 695                          vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
 696         }
 697
 698         if (!newasid) {
 699                 /* If we preempted while the guest was executing, then reload the pre-empted ASID */
 700                 if (current->flags & PF_VCPU) {
 701                         write_c0_entryhi(vcpu->arch.
 702                                          preempt_entryhi & ASID_MASK);
 703                         ehb();
 704                 }
 705         } else {
 706                 /* New ASIDs were allocated for the VM */
 707
 708                 /* Were we in guest context? If so then the pre-empted ASID is no longer
 709                  * valid, we need to set it to what it should be based on the mode of
 710                  * the Guest (Kernel/User)
 711                  */
 712                 if (current->flags & PF_VCPU) {
 713                         if (KVM_GUEST_KERNEL_MODE(vcpu))
 714                                 write_c0_entryhi(vcpu->arch.
 715                                                  guest_kernel_asid[cpu] &
 716                                                  ASID_MASK);
 717                         else
 718                                 write_c0_entryhi(vcpu->arch.
 719                                                  guest_user_asid[cpu] &
 720                                                  ASID_MASK);
 721                         ehb();
 722                 }
 723         }
 724
 725         local_irq_restore(flags);
 726
 727 }
 728
 729 /* ASID can change if another task is scheduled during preemption */
 730 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 731 {
 732         unsigned long flags;
 733         uint32_t cpu;
 734
 735         local_irq_save(flags);
 736
 737         cpu = smp_processor_id();
 738
 739
 740         vcpu->arch.preempt_entryhi = read_c0_entryhi();
 741         vcpu->arch.last_sched_cpu = cpu;
 742
 743         if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
 744              ASID_VERSION_MASK)) {
 745                 kvm_debug("%s: Dropping MMU Context:  %#lx\n", __func__,
 746                           cpu_context(cpu, current->mm));
 747                 drop_mmu_context(current->mm, cpu);
 748         }
 749         write_c0_entryhi(cpu_asid(cpu, current->mm));
 750         ehb();
 751
 752         local_irq_restore(flags);
 753 }
 754
 755 uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu)
 756 {
 757         struct mips_coproc *cop0 = vcpu->arch.cop0;
 758         unsigned long paddr, flags;
 759         uint32_t inst;
 760         int index;
 761
 762         if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
 763             KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
 764                 local_irq_save(flags);
 765                 index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
 766                 if (index >= 0) {
 767                         inst = *(opc);
 768                 } else {
 769                         index =
 770                             kvm_mips_guest_tlb_lookup(vcpu,
 771                                                       ((unsigned long) opc & VPN2_MASK)
 772                                                       |
 773                                                       (kvm_read_c0_guest_entryhi
 774                                                        (cop0) & ASID_MASK));
 775                         if (index < 0) {
 776                                 kvm_err
 777                                     ("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
 778                                      __func__, opc, vcpu, read_c0_entryhi());
 779                                 kvm_mips_dump_host_tlbs();
 780                                 local_irq_restore(flags);
 781                                 return KVM_INVALID_INST;
 782                         }
 783                         kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
 784                                                              &vcpu->arch.
 785                                                              guest_tlb[index],
 786                                                              NULL, NULL);
 787                         inst = *(opc);
 788                 }
 789                 local_irq_restore(flags);
 790         } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
 791                 paddr =
 792                     kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
 793                                                          (unsigned long) opc);
 794                 inst = *(uint32_t *) CKSEG0ADDR(paddr);
 795         } else {
 796                 kvm_err("%s: illegal address: %p\n", __func__, opc);
 797                 return KVM_INVALID_INST;
 798         }
 799
 800         return inst;
 801 }
 802
 803 EXPORT_SYMBOL(kvm_local_flush_tlb_all);
 804 EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault);
 805 EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault);
 806 EXPORT_SYMBOL(kvm_mips_dump_host_tlbs);
 807 EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault);
 808 EXPORT_SYMBOL(kvm_mips_host_tlb_lookup);
 809 EXPORT_SYMBOL(kvm_mips_flush_host_tlb);
 810 EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup);
 811 EXPORT_SYMBOL(kvm_mips_host_tlb_inv);
 812 EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa);
 813 EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs);
 814 EXPORT_SYMBOL(kvm_get_inst);
 815 EXPORT_SYMBOL(kvm_arch_vcpu_load);
 816 EXPORT_SYMBOL(kvm_arch_vcpu_put);