arch/powerpc/kvm/e500_mmu_host.c

   1 /*
   2  * Copyright (C) 2008-2013 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  *         Alexander Graf, agraf@suse.de
   9  *
  10  * Description:
  11  * This file is based on arch/powerpc/kvm/44x_tlb.c,
  12  * by Hollis Blanchard <hollisb@us.ibm.com>.
  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 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23 #include <linux/kvm.h>
  24 #include <linux/kvm_host.h>
  25 #include <linux/highmem.h>
  26 #include <linux/log2.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/sched.h>
  29 #include <linux/rwsem.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/hugetlb.h>
  32 #include <asm/kvm_ppc.h>
  33
  34 #include "e500.h"
  35 #include "trace.h"
  36 #include "timing.h"
  37 #include "e500_mmu_host.h"
  38
  39 #define to_htlb1_esel(esel) (host_tlb_params[1].entries - (esel) - 1)
  40
  41 static struct kvmppc_e500_tlb_params host_tlb_params[E500_TLB_NUM];
  42
  43 static inline unsigned int tlb1_max_shadow_size(void)
  44 {
  45         /* reserve one entry for magic page */
  46         return host_tlb_params[1].entries - tlbcam_index - 1;
  47 }
  48
  49 static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
  50 {
  51         /* Mask off reserved bits. */
  52         mas3 &= MAS3_ATTRIB_MASK;
  53
  54 #ifndef CONFIG_KVM_BOOKE_HV
  55         if (!usermode) {
  56                 /* Guest is in supervisor mode,
  57                  * so we need to translate guest
  58                  * supervisor permissions into user permissions. */
  59                 mas3 &= ~E500_TLB_USER_PERM_MASK;
  60                 mas3 |= (mas3 & E500_TLB_SUPER_PERM_MASK) << 1;
  61         }
  62         mas3 |= E500_TLB_SUPER_PERM_MASK;
  63 #endif
  64         return mas3;
  65 }
  66
  67 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
  68 {
  69 #ifdef CONFIG_SMP
  70         return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
  71 #else
  72         return mas2 & MAS2_ATTRIB_MASK;
  73 #endif
  74 }
  75
  76 /*
  77  * writing shadow tlb entry to host TLB
  78  */
  79 static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe,
  80                                      uint32_t mas0)
  81 {
  82         unsigned long flags;
  83
  84         local_irq_save(flags);
  85         mtspr(SPRN_MAS0, mas0);
  86         mtspr(SPRN_MAS1, stlbe->mas1);
  87         mtspr(SPRN_MAS2, (unsigned long)stlbe->mas2);
  88         mtspr(SPRN_MAS3, (u32)stlbe->mas7_3);
  89         mtspr(SPRN_MAS7, (u32)(stlbe->mas7_3 >> 32));
  90 #ifdef CONFIG_KVM_BOOKE_HV
  91         mtspr(SPRN_MAS8, stlbe->mas8);
  92 #endif
  93         asm volatile("isync; tlbwe" : : : "memory");
  94
  95 #ifdef CONFIG_KVM_BOOKE_HV
  96         /* Must clear mas8 for other host tlbwe's */
  97         mtspr(SPRN_MAS8, 0);
  98         isync();
  99 #endif
 100         local_irq_restore(flags);
 101
 102         trace_kvm_booke206_stlb_write(mas0, stlbe->mas8, stlbe->mas1,
 103                                       stlbe->mas2, stlbe->mas7_3);
 104 }
 105
 106 /*
 107  * Acquire a mas0 with victim hint, as if we just took a TLB miss.
 108  *
 109  * We don't care about the address we're searching for, other than that it's
 110  * in the right set and is not present in the TLB.  Using a zero PID and a
 111  * userspace address means we don't have to set and then restore MAS5, or
 112  * calculate a proper MAS6 value.
 113  */
 114 static u32 get_host_mas0(unsigned long eaddr)
 115 {
 116         unsigned long flags;
 117         u32 mas0;
 118
 119         local_irq_save(flags);
 120         mtspr(SPRN_MAS6, 0);
 121         asm volatile("tlbsx 0, %0" : : "b" (eaddr & ~CONFIG_PAGE_OFFSET));
 122         mas0 = mfspr(SPRN_MAS0);
 123         local_irq_restore(flags);
 124
 125         return mas0;
 126 }
 127
 128 /* sesel is for tlb1 only */
 129 static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
 130                 int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe)
 131 {
 132         u32 mas0;
 133
 134         if (tlbsel == 0) {
 135                 mas0 = get_host_mas0(stlbe->mas2);
 136                 __write_host_tlbe(stlbe, mas0);
 137         } else {
 138                 __write_host_tlbe(stlbe,
 139                                   MAS0_TLBSEL(1) |
 140                                   MAS0_ESEL(to_htlb1_esel(sesel)));
 141         }
 142 }
 143
 144 /* sesel is for tlb1 only */
 145 static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
 146                         struct kvm_book3e_206_tlb_entry *gtlbe,
 147                         struct kvm_book3e_206_tlb_entry *stlbe,
 148                         int stlbsel, int sesel)
 149 {
 150         int stid;
 151
 152         preempt_disable();
 153         stid = kvmppc_e500_get_tlb_stid(&vcpu_e500->vcpu, gtlbe);
 154
 155         stlbe->mas1 |= MAS1_TID(stid);
 156         write_host_tlbe(vcpu_e500, stlbsel, sesel, stlbe);
 157         preempt_enable();
 158 }
 159
 160 #ifdef CONFIG_KVM_E500V2
 161 /* XXX should be a hook in the gva2hpa translation */
 162 void kvmppc_map_magic(struct kvm_vcpu *vcpu)
 163 {
 164         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 165         struct kvm_book3e_206_tlb_entry magic;
 166         ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
 167         unsigned int stid;
 168         pfn_t pfn;
 169
 170         pfn = (pfn_t)virt_to_phys((void *)shared_page) >> PAGE_SHIFT;
 171         get_page(pfn_to_page(pfn));
 172
 173         preempt_disable();
 174         stid = kvmppc_e500_get_sid(vcpu_e500, 0, 0, 0, 0);
 175
 176         magic.mas1 = MAS1_VALID | MAS1_TS | MAS1_TID(stid) |
 177                      MAS1_TSIZE(BOOK3E_PAGESZ_4K);
 178         magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M;
 179         magic.mas7_3 = ((u64)pfn << PAGE_SHIFT) |
 180                        MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR;
 181         magic.mas8 = 0;
 182
 183         __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index));
 184         preempt_enable();
 185 }
 186 #endif
 187
 188 void inval_gtlbe_on_host(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
 189                          int esel)
 190 {
 191         struct kvm_book3e_206_tlb_entry *gtlbe =
 192                 get_entry(vcpu_e500, tlbsel, esel);
 193         struct tlbe_ref *ref = &vcpu_e500->gtlb_priv[tlbsel][esel].ref;
 194
 195         /* Don't bother with unmapped entries */
 196         if (!(ref->flags & E500_TLB_VALID)) {
 197                 WARN(ref->flags & (E500_TLB_BITMAP | E500_TLB_TLB0),
 198                      "%s: flags %x\n", __func__, ref->flags);
 199                 WARN_ON(tlbsel == 1 && vcpu_e500->g2h_tlb1_map[esel]);
 200         }
 201
 202         if (tlbsel == 1 && ref->flags & E500_TLB_BITMAP) {
 203                 u64 tmp = vcpu_e500->g2h_tlb1_map[esel];
 204                 int hw_tlb_indx;
 205                 unsigned long flags;
 206
 207                 local_irq_save(flags);
 208                 while (tmp) {
 209                         hw_tlb_indx = __ilog2_u64(tmp & -tmp);
 210                         mtspr(SPRN_MAS0,
 211                               MAS0_TLBSEL(1) |
 212                               MAS0_ESEL(to_htlb1_esel(hw_tlb_indx)));
 213                         mtspr(SPRN_MAS1, 0);
 214                         asm volatile("tlbwe");
 215                         vcpu_e500->h2g_tlb1_rmap[hw_tlb_indx] = 0;
 216                         tmp &= tmp - 1;
 217                 }
 218                 mb();
 219                 vcpu_e500->g2h_tlb1_map[esel] = 0;
 220                 ref->flags &= ~(E500_TLB_BITMAP | E500_TLB_VALID);
 221                 local_irq_restore(flags);
 222         }
 223
 224         if (tlbsel == 1 && ref->flags & E500_TLB_TLB0) {
 225                 /*
 226                  * TLB1 entry is backed by 4k pages. This should happen
 227                  * rarely and is not worth optimizing. Invalidate everything.
 228                  */
 229                 kvmppc_e500_tlbil_all(vcpu_e500);
 230                 ref->flags &= ~(E500_TLB_TLB0 | E500_TLB_VALID);
 231         }
 232
 233         /* Already invalidated in between */
 234         if (!(ref->flags & E500_TLB_VALID))
 235                 return;
 236
 237         /* Guest tlbe is backed by at most one host tlbe per shadow pid. */
 238         kvmppc_e500_tlbil_one(vcpu_e500, gtlbe);
 239
 240         /* Mark the TLB as not backed by the host anymore */
 241         ref->flags &= ~E500_TLB_VALID;
 242 }
 243
 244 static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe)
 245 {
 246         return tlbe->mas7_3 & (MAS3_SW|MAS3_UW);
 247 }
 248
 249 static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
 250                                          struct kvm_book3e_206_tlb_entry *gtlbe,
 251                                          pfn_t pfn)
 252 {
 253         ref->pfn = pfn;
 254         ref->flags |= E500_TLB_VALID;
 255
 256         if (tlbe_is_writable(gtlbe))
 257                 kvm_set_pfn_dirty(pfn);
 258 }
 259
 260 static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref)
 261 {
 262         if (ref->flags & E500_TLB_VALID) {
 263                 /* FIXME: don't log bogus pfn for TLB1 */
 264                 trace_kvm_booke206_ref_release(ref->pfn, ref->flags);
 265                 ref->flags = 0;
 266         }
 267 }
 268
 269 static void clear_tlb1_bitmap(struct kvmppc_vcpu_e500 *vcpu_e500)
 270 {
 271         if (vcpu_e500->g2h_tlb1_map)
 272                 memset(vcpu_e500->g2h_tlb1_map, 0,
 273                        sizeof(u64) * vcpu_e500->gtlb_params[1].entries);
 274         if (vcpu_e500->h2g_tlb1_rmap)
 275                 memset(vcpu_e500->h2g_tlb1_rmap, 0,
 276                        sizeof(unsigned int) * host_tlb_params[1].entries);
 277 }
 278
 279 static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500)
 280 {
 281         int tlbsel;
 282         int i;
 283
 284         for (tlbsel = 0; tlbsel <= 1; tlbsel++) {
 285                 for (i = 0; i < vcpu_e500->gtlb_params[tlbsel].entries; i++) {
 286                         struct tlbe_ref *ref =
 287                                 &vcpu_e500->gtlb_priv[tlbsel][i].ref;
 288                         kvmppc_e500_ref_release(ref);
 289                 }
 290         }
 291 }
 292
 293 void kvmppc_core_flush_tlb(struct kvm_vcpu *vcpu)
 294 {
 295         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 296         kvmppc_e500_tlbil_all(vcpu_e500);
 297         clear_tlb_privs(vcpu_e500);
 298         clear_tlb1_bitmap(vcpu_e500);
 299 }
 300
 301 /* TID must be supplied by the caller */
 302 static void kvmppc_e500_setup_stlbe(
 303         struct kvm_vcpu *vcpu,
 304         struct kvm_book3e_206_tlb_entry *gtlbe,
 305         int tsize, struct tlbe_ref *ref, u64 gvaddr,
 306         struct kvm_book3e_206_tlb_entry *stlbe)
 307 {
 308         pfn_t pfn = ref->pfn;
 309         u32 pr = vcpu->arch.shared->msr & MSR_PR;
 310
 311         BUG_ON(!(ref->flags & E500_TLB_VALID));
 312
 313         /* Force IPROT=0 for all guest mappings. */
 314         stlbe->mas1 = MAS1_TSIZE(tsize) | get_tlb_sts(gtlbe) | MAS1_VALID;
 315         stlbe->mas2 = (gvaddr & MAS2_EPN) |
 316                       e500_shadow_mas2_attrib(gtlbe->mas2, pr);
 317         stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) |
 318                         e500_shadow_mas3_attrib(gtlbe->mas7_3, pr);
 319
 320 #ifdef CONFIG_KVM_BOOKE_HV
 321         stlbe->mas8 = MAS8_TGS | vcpu->kvm->arch.lpid;
 322 #endif
 323 }
 324
 325 static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 326         u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
 327         int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe,
 328         struct tlbe_ref *ref)
 329 {
 330         struct kvm_memory_slot *slot;
 331         unsigned long pfn = 0; /* silence GCC warning */
 332         unsigned long hva;
 333         int pfnmap = 0;
 334         int tsize = BOOK3E_PAGESZ_4K;
 335
 336         /*
 337          * Translate guest physical to true physical, acquiring
 338          * a page reference if it is normal, non-reserved memory.
 339          *
 340          * gfn_to_memslot() must succeed because otherwise we wouldn't
 341          * have gotten this far.  Eventually we should just pass the slot
 342          * pointer through from the first lookup.
 343          */
 344         slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
 345         hva = gfn_to_hva_memslot(slot, gfn);
 346
 347         if (tlbsel == 1) {
 348                 struct vm_area_struct *vma;
 349                 down_read(&current->mm->mmap_sem);
 350
 351                 vma = find_vma(current->mm, hva);
 352                 if (vma && hva >= vma->vm_start &&
 353                     (vma->vm_flags & VM_PFNMAP)) {
 354                         /*
 355                          * This VMA is a physically contiguous region (e.g.
 356                          * /dev/mem) that bypasses normal Linux page
 357                          * management.  Find the overlap between the
 358                          * vma and the memslot.
 359                          */
 360
 361                         unsigned long start, end;
 362                         unsigned long slot_start, slot_end;
 363
 364                         pfnmap = 1;
 365
 366                         start = vma->vm_pgoff;
 367                         end = start +
 368                               ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
 369
 370                         pfn = start + ((hva - vma->vm_start) >> PAGE_SHIFT);
 371
 372                         slot_start = pfn - (gfn - slot->base_gfn);
 373                         slot_end = slot_start + slot->npages;
 374
 375                         if (start < slot_start)
 376                                 start = slot_start;
 377                         if (end > slot_end)
 378                                 end = slot_end;
 379
 380                         tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
 381                                 MAS1_TSIZE_SHIFT;
 382
 383                         /*
 384                          * e500 doesn't implement the lowest tsize bit,
 385                          * or 1K pages.
 386                          */
 387                         tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
 388
 389                         /*
 390                          * Now find the largest tsize (up to what the guest
 391                          * requested) that will cover gfn, stay within the
 392                          * range, and for which gfn and pfn are mutually
 393                          * aligned.
 394                          */
 395
 396                         for (; tsize > BOOK3E_PAGESZ_4K; tsize -= 2) {
 397                                 unsigned long gfn_start, gfn_end, tsize_pages;
 398                                 tsize_pages = 1 << (tsize - 2);
 399
 400                                 gfn_start = gfn & ~(tsize_pages - 1);
 401                                 gfn_end = gfn_start + tsize_pages;
 402
 403                                 if (gfn_start + pfn - gfn < start)
 404                                         continue;
 405                                 if (gfn_end + pfn - gfn > end)
 406                                         continue;
 407                                 if ((gfn & (tsize_pages - 1)) !=
 408                                     (pfn & (tsize_pages - 1)))
 409                                         continue;
 410
 411                                 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
 412                                 pfn &= ~(tsize_pages - 1);
 413                                 break;
 414                         }
 415                 } else if (vma && hva >= vma->vm_start &&
 416                            (vma->vm_flags & VM_HUGETLB)) {
 417                         unsigned long psize = vma_kernel_pagesize(vma);
 418
 419                         tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
 420                                 MAS1_TSIZE_SHIFT;
 421
 422                         /*
 423                          * Take the largest page size that satisfies both host
 424                          * and guest mapping
 425                          */
 426                         tsize = min(__ilog2(psize) - 10, tsize);
 427
 428                         /*
 429                          * e500 doesn't implement the lowest tsize bit,
 430                          * or 1K pages.
 431                          */
 432                         tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
 433                 }
 434
 435                 up_read(&current->mm->mmap_sem);
 436         }
 437
 438         if (likely(!pfnmap)) {
 439                 unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT);
 440                 pfn = gfn_to_pfn_memslot(slot, gfn);
 441                 if (is_error_noslot_pfn(pfn)) {
 442                         printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
 443                                         (long)gfn);
 444                         return -EINVAL;
 445                 }
 446
 447                 /* Align guest and physical address to page map boundaries */
 448                 pfn &= ~(tsize_pages - 1);
 449                 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
 450         }
 451
 452         kvmppc_e500_ref_setup(ref, gtlbe, pfn);
 453
 454         kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
 455                                 ref, gvaddr, stlbe);
 456
 457         /* Clear i-cache for new pages */
 458         kvmppc_mmu_flush_icache(pfn);
 459
 460         /* Drop refcount on page, so that mmu notifiers can clear it */
 461         kvm_release_pfn_clean(pfn);
 462
 463         return 0;
 464 }
 465
 466 /* XXX only map the one-one case, for now use TLB0 */
 467 static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, int esel,
 468                                 struct kvm_book3e_206_tlb_entry *stlbe)
 469 {
 470         struct kvm_book3e_206_tlb_entry *gtlbe;
 471         struct tlbe_ref *ref;
 472         int stlbsel = 0;
 473         int sesel = 0;
 474         int r;
 475
 476         gtlbe = get_entry(vcpu_e500, 0, esel);
 477         ref = &vcpu_e500->gtlb_priv[0][esel].ref;
 478
 479         r = kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
 480                         get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
 481                         gtlbe, 0, stlbe, ref);
 482         if (r)
 483                 return r;
 484
 485         write_stlbe(vcpu_e500, gtlbe, stlbe, stlbsel, sesel);
 486
 487         return 0;
 488 }
 489
 490 static int kvmppc_e500_tlb1_map_tlb1(struct kvmppc_vcpu_e500 *vcpu_e500,
 491                                      struct tlbe_ref *ref,
 492                                      int esel)
 493 {
 494         unsigned int sesel = vcpu_e500->host_tlb1_nv++;
 495
 496         if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size()))
 497                 vcpu_e500->host_tlb1_nv = 0;
 498
 499         if (vcpu_e500->h2g_tlb1_rmap[sesel]) {
 500                 unsigned int idx = vcpu_e500->h2g_tlb1_rmap[sesel] - 1;
 501                 vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << sesel);
 502         }
 503
 504         vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_BITMAP;
 505         vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << sesel;
 506         vcpu_e500->h2g_tlb1_rmap[sesel] = esel + 1;
 507         WARN_ON(!(ref->flags & E500_TLB_VALID));
 508
 509         return sesel;
 510 }
 511
 512 /* Caller must ensure that the specified guest TLB entry is safe to insert into
 513  * the shadow TLB. */
 514 /* For both one-one and one-to-many */
 515 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 516                 u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
 517                 struct kvm_book3e_206_tlb_entry *stlbe, int esel)
 518 {
 519         struct tlbe_ref *ref = &vcpu_e500->gtlb_priv[1][esel].ref;
 520         int sesel;
 521         int r;
 522
 523         r = kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe,
 524                                    ref);
 525         if (r)
 526                 return r;
 527
 528         /* Use TLB0 when we can only map a page with 4k */
 529         if (get_tlb_tsize(stlbe) == BOOK3E_PAGESZ_4K) {
 530                 vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_TLB0;
 531                 write_stlbe(vcpu_e500, gtlbe, stlbe, 0, 0);
 532                 return 0;
 533         }
 534
 535         /* Otherwise map into TLB1 */
 536         sesel = kvmppc_e500_tlb1_map_tlb1(vcpu_e500, ref, esel);
 537         write_stlbe(vcpu_e500, gtlbe, stlbe, 1, sesel);
 538
 539         return 0;
 540 }
 541
 542 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
 543                     unsigned int index)
 544 {
 545         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 546         struct tlbe_priv *priv;
 547         struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
 548         int tlbsel = tlbsel_of(index);
 549         int esel = esel_of(index);
 550
 551         gtlbe = get_entry(vcpu_e500, tlbsel, esel);
 552
 553         switch (tlbsel) {
 554         case 0:
 555                 priv = &vcpu_e500->gtlb_priv[tlbsel][esel];
 556
 557                 /* Triggers after clear_tlb_privs or on initial mapping */
 558                 if (!(priv->ref.flags & E500_TLB_VALID)) {
 559                         kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe);
 560                 } else {
 561                         kvmppc_e500_setup_stlbe(vcpu, gtlbe, BOOK3E_PAGESZ_4K,
 562                                                 &priv->ref, eaddr, &stlbe);
 563                         write_stlbe(vcpu_e500, gtlbe, &stlbe, 0, 0);
 564                 }
 565                 break;
 566
 567         case 1: {
 568                 gfn_t gfn = gpaddr >> PAGE_SHIFT;
 569                 kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe, &stlbe,
 570                                      esel);
 571                 break;
 572         }
 573
 574         default:
 575                 BUG();
 576                 break;
 577         }
 578 }
 579
 580 /************* MMU Notifiers *************/
 581
 582 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
 583 {
 584         trace_kvm_unmap_hva(hva);
 585
 586         /*
 587          * Flush all shadow tlb entries everywhere. This is slow, but
 588          * we are 100% sure that we catch the to be unmapped page
 589          */
 590         kvm_flush_remote_tlbs(kvm);
 591
 592         return 0;
 593 }
 594
 595 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
 596 {
 597         /* kvm_unmap_hva flushes everything anyways */
 598         kvm_unmap_hva(kvm, start);
 599
 600         return 0;
 601 }
 602
 603 int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 604 {
 605         /* XXX could be more clever ;) */
 606         return 0;
 607 }
 608
 609 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 610 {
 611         /* XXX could be more clever ;) */
 612         return 0;
 613 }
 614
 615 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 616 {
 617         /* The page will get remapped properly on its next fault */
 618         kvm_unmap_hva(kvm, hva);
 619 }
 620
 621 /*****************************************/
 622
 623 int e500_mmu_host_init(struct kvmppc_vcpu_e500 *vcpu_e500)
 624 {
 625         host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY;
 626         host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
 627
 628         /*
 629          * This should never happen on real e500 hardware, but is
 630          * architecturally possible -- e.g. in some weird nested
 631          * virtualization case.
 632          */
 633         if (host_tlb_params[0].entries == 0 ||
 634             host_tlb_params[1].entries == 0) {
 635                 pr_err("%s: need to know host tlb size\n", __func__);
 636                 return -ENODEV;
 637         }
 638
 639         host_tlb_params[0].ways = (mfspr(SPRN_TLB0CFG) & TLBnCFG_ASSOC) >>
 640                                   TLBnCFG_ASSOC_SHIFT;
 641         host_tlb_params[1].ways = host_tlb_params[1].entries;
 642
 643         if (!is_power_of_2(host_tlb_params[0].entries) ||
 644             !is_power_of_2(host_tlb_params[0].ways) ||
 645             host_tlb_params[0].entries < host_tlb_params[0].ways ||
 646             host_tlb_params[0].ways == 0) {
 647                 pr_err("%s: bad tlb0 host config: %u entries %u ways\n",
 648                        __func__, host_tlb_params[0].entries,
 649                        host_tlb_params[0].ways);
 650                 return -ENODEV;
 651         }
 652
 653         host_tlb_params[0].sets =
 654                 host_tlb_params[0].entries / host_tlb_params[0].ways;
 655         host_tlb_params[1].sets = 1;
 656
 657         vcpu_e500->h2g_tlb1_rmap = kzalloc(sizeof(unsigned int) *
 658                                            host_tlb_params[1].entries,
 659                                            GFP_KERNEL);
 660         if (!vcpu_e500->h2g_tlb1_rmap)
 661                 return -EINVAL;
 662
 663         return 0;
 664 }
 665
 666 void e500_mmu_host_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
 667 {
 668         kfree(vcpu_e500->h2g_tlb1_rmap);
 669 }