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x86/oprofile: Fix bogus GCC-8 warning in nmi_setup()
[cris-mirror.git] / arch / powerpc / kvm / book3s_64_mmu_hv.c
blobef243fed2f2b6b8f566dd931a501aa24e8ba8661
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
14 *
15 * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
16 */
17
18 #include <linux/types.h>
19 #include <linux/string.h>
20 #include <linux/kvm.h>
21 #include <linux/kvm_host.h>
22 #include <linux/highmem.h>
23 #include <linux/gfp.h>
24 #include <linux/slab.h>
25 #include <linux/hugetlb.h>
26 #include <linux/vmalloc.h>
27 #include <linux/srcu.h>
28 #include <linux/anon_inodes.h>
29 #include <linux/file.h>
30 #include <linux/debugfs.h>
31
32 #include <asm/tlbflush.h>
33 #include <asm/kvm_ppc.h>
34 #include <asm/kvm_book3s.h>
35 #include <asm/book3s/64/mmu-hash.h>
36 #include <asm/hvcall.h>
37 #include <asm/synch.h>
38 #include <asm/ppc-opcode.h>
39 #include <asm/cputable.h>
40 #include <asm/pte-walk.h>
41
42 #include "trace_hv.h"
43
44 //#define DEBUG_RESIZE_HPT 1
45
46 #ifdef DEBUG_RESIZE_HPT
47 #define resize_hpt_debug(resize, ...) \
48 do { \
49 printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \
50 printk(__VA_ARGS__); \
51 } while (0)
52 #else
53 #define resize_hpt_debug(resize, ...) \
54 do { } while (0)
55 #endif
56
57 static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
58 long pte_index, unsigned long pteh,
59 unsigned long ptel, unsigned long *pte_idx_ret);
60
61 struct kvm_resize_hpt {
62 /* These fields read-only after init */
63 struct kvm *kvm;
64 struct work_struct work;
65 u32 order;
66
67 /* These fields protected by kvm->lock */
68
69 /* Possible values and their usage:
70 * <0 an error occurred during allocation,
71 * -EBUSY allocation is in the progress,
72 * 0 allocation made successfuly.
73 */
74 int error;
75
76 /* Private to the work thread, until error != -EBUSY,
77 * then protected by kvm->lock.
78 */
79 struct kvm_hpt_info hpt;
80 };
81
82 int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order)
83 {
84 unsigned long hpt = 0;
85 int cma = 0;
86 struct page *page = NULL;
87 struct revmap_entry *rev;
88 unsigned long npte;
89
90 if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER))
91 return -EINVAL;
92
93 page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT));
94 if (page) {
95 hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
96 memset((void *)hpt, 0, (1ul << order));
97 cma = 1;
98 }
99
100 if (!hpt)
101 hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_RETRY_MAYFAIL
102 |__GFP_NOWARN, order - PAGE_SHIFT);
103
104 if (!hpt)
105 return -ENOMEM;
106
107 /* HPTEs are 2**4 bytes long */
108 npte = 1ul << (order - 4);
109
110 /* Allocate reverse map array */
111 rev = vmalloc(sizeof(struct revmap_entry) * npte);
112 if (!rev) {
113 if (cma)
114 kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT));
115 else
116 free_pages(hpt, order - PAGE_SHIFT);
117 return -ENOMEM;
118 }
119
120 info->order = order;
121 info->virt = hpt;
122 info->cma = cma;
123 info->rev = rev;
124
125 return 0;
126 }
127
128 void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info)
129 {
130 atomic64_set(&kvm->arch.mmio_update, 0);
131 kvm->arch.hpt = *info;
132 kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18);
133
134 pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n",
135 info->virt, (long)info->order, kvm->arch.lpid);
136 }
137
138 long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order)
139 {
140 long err = -EBUSY;
141 struct kvm_hpt_info info;
142
143 mutex_lock(&kvm->lock);
144 if (kvm->arch.mmu_ready) {
145 kvm->arch.mmu_ready = 0;
146 /* order mmu_ready vs. vcpus_running */
147 smp_mb();
148 if (atomic_read(&kvm->arch.vcpus_running)) {
149 kvm->arch.mmu_ready = 1;
150 goto out;
151 }
152 }
153 if (kvm_is_radix(kvm)) {
154 err = kvmppc_switch_mmu_to_hpt(kvm);
155 if (err)
156 goto out;
157 }
158
159 if (kvm->arch.hpt.order == order) {
160 /* We already have a suitable HPT */
161
162 /* Set the entire HPT to 0, i.e. invalid HPTEs */
163 memset((void *)kvm->arch.hpt.virt, 0, 1ul << order);
164 /*
165 * Reset all the reverse-mapping chains for all memslots
166 */
167 kvmppc_rmap_reset(kvm);
168 err = 0;
169 goto out;
170 }
171
172 if (kvm->arch.hpt.virt) {
173 kvmppc_free_hpt(&kvm->arch.hpt);
174 kvmppc_rmap_reset(kvm);
175 }
176
177 err = kvmppc_allocate_hpt(&info, order);
178 if (err < 0)
179 goto out;
180 kvmppc_set_hpt(kvm, &info);
181
182 out:
183 if (err == 0)
184 /* Ensure that each vcpu will flush its TLB on next entry. */
185 cpumask_setall(&kvm->arch.need_tlb_flush);
186
187 mutex_unlock(&kvm->lock);
188 return err;
189 }
190
191 void kvmppc_free_hpt(struct kvm_hpt_info *info)
192 {
193 vfree(info->rev);
194 info->rev = NULL;
195 if (info->cma)
196 kvm_free_hpt_cma(virt_to_page(info->virt),
197 1 << (info->order - PAGE_SHIFT));
198 else if (info->virt)
199 free_pages(info->virt, info->order - PAGE_SHIFT);
200 info->virt = 0;
201 info->order = 0;
202 }
203
204 /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */
205 static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize)
206 {
207 return (pgsize > 0x1000) ? HPTE_V_LARGE : 0;
208 }
209
210 /* Bits in second HPTE dword for pagesize 4k, 64k or 16M */
211 static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize)
212 {
213 return (pgsize == 0x10000) ? 0x1000 : 0;
214 }
215
216 void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
217 unsigned long porder)
218 {
219 unsigned long i;
220 unsigned long npages;
221 unsigned long hp_v, hp_r;
222 unsigned long addr, hash;
223 unsigned long psize;
224 unsigned long hp0, hp1;
225 unsigned long idx_ret;
226 long ret;
227 struct kvm *kvm = vcpu->kvm;
228
229 psize = 1ul << porder;
230 npages = memslot->npages >> (porder - PAGE_SHIFT);
231
232 /* VRMA can't be > 1TB */
233 if (npages > 1ul << (40 - porder))
234 npages = 1ul << (40 - porder);
235 /* Can't use more than 1 HPTE per HPTEG */
236 if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1)
237 npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1;
238
239 hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
240 HPTE_V_BOLTED | hpte0_pgsize_encoding(psize);
241 hp1 = hpte1_pgsize_encoding(psize) |
242 HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
243
244 for (i = 0; i < npages; ++i) {
245 addr = i << porder;
246 /* can't use hpt_hash since va > 64 bits */
247 hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25)))
248 & kvmppc_hpt_mask(&kvm->arch.hpt);
249 /*
250 * We assume that the hash table is empty and no
251 * vcpus are using it at this stage. Since we create
252 * at most one HPTE per HPTEG, we just assume entry 7
253 * is available and use it.
254 */
255 hash = (hash << 3) + 7;
256 hp_v = hp0 | ((addr >> 16) & ~0x7fUL);
257 hp_r = hp1 | addr;
258 ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, hash, hp_v, hp_r,
259 &idx_ret);
260 if (ret != H_SUCCESS) {
261 pr_err("KVM: map_vrma at %lx failed, ret=%ld\n",
262 addr, ret);
263 break;
264 }
265 }
266 }
267
268 int kvmppc_mmu_hv_init(void)
269 {
270 unsigned long host_lpid, rsvd_lpid;
271
272 if (!cpu_has_feature(CPU_FTR_HVMODE))
273 return -EINVAL;
274
275 /* POWER7 has 10-bit LPIDs (12-bit in POWER8) */
276 host_lpid = mfspr(SPRN_LPID);
277 rsvd_lpid = LPID_RSVD;
278
279 kvmppc_init_lpid(rsvd_lpid + 1);
280
281 kvmppc_claim_lpid(host_lpid);
282 /* rsvd_lpid is reserved for use in partition switching */
283 kvmppc_claim_lpid(rsvd_lpid);
284
285 return 0;
286 }
287
288 static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
289 {
290 unsigned long msr = vcpu->arch.intr_msr;
291
292 /* If transactional, change to suspend mode on IRQ delivery */
293 if (MSR_TM_TRANSACTIONAL(vcpu->arch.shregs.msr))
294 msr |= MSR_TS_S;
295 else
296 msr |= vcpu->arch.shregs.msr & MSR_TS_MASK;
297 kvmppc_set_msr(vcpu, msr);
298 }
299
300 static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
301 long pte_index, unsigned long pteh,
302 unsigned long ptel, unsigned long *pte_idx_ret)
303 {
304 long ret;
305
306 /* Protect linux PTE lookup from page table destruction */
307 rcu_read_lock_sched(); /* this disables preemption too */
308 ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel,
309 current->mm->pgd, false, pte_idx_ret);
310 rcu_read_unlock_sched();
311 if (ret == H_TOO_HARD) {
312 /* this can't happen */
313 pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n");
314 ret = H_RESOURCE; /* or something */
315 }
316 return ret;
317
318 }
319
320 static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu,
321 gva_t eaddr)
322 {
323 u64 mask;
324 int i;
325
326 for (i = 0; i < vcpu->arch.slb_nr; i++) {
327 if (!(vcpu->arch.slb[i].orige & SLB_ESID_V))
328 continue;
329
330 if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T)
331 mask = ESID_MASK_1T;
332 else
333 mask = ESID_MASK;
334
335 if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0)
336 return &vcpu->arch.slb[i];
337 }
338 return NULL;
339 }
340
341 static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r,
342 unsigned long ea)
343 {
344 unsigned long ra_mask;
345
346 ra_mask = kvmppc_actual_pgsz(v, r) - 1;
347 return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask);
348 }
349
350 static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
351 struct kvmppc_pte *gpte, bool data, bool iswrite)
352 {
353 struct kvm *kvm = vcpu->kvm;
354 struct kvmppc_slb *slbe;
355 unsigned long slb_v;
356 unsigned long pp, key;
357 unsigned long v, orig_v, gr;
358 __be64 *hptep;
359 int index;
360 int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR);
361
362 if (kvm_is_radix(vcpu->kvm))
363 return kvmppc_mmu_radix_xlate(vcpu, eaddr, gpte, data, iswrite);
364
365 /* Get SLB entry */
366 if (virtmode) {
367 slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr);
368 if (!slbe)
369 return -EINVAL;
370 slb_v = slbe->origv;
371 } else {
372 /* real mode access */
373 slb_v = vcpu->kvm->arch.vrma_slb_v;
374 }
375
376 preempt_disable();
377 /* Find the HPTE in the hash table */
378 index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v,
379 HPTE_V_VALID | HPTE_V_ABSENT);
380 if (index < 0) {
381 preempt_enable();
382 return -ENOENT;
383 }
384 hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
385 v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK;
386 if (cpu_has_feature(CPU_FTR_ARCH_300))
387 v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1]));
388 gr = kvm->arch.hpt.rev[index].guest_rpte;
389
390 unlock_hpte(hptep, orig_v);
391 preempt_enable();
392
393 gpte->eaddr = eaddr;
394 gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff);
395
396 /* Get PP bits and key for permission check */
397 pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
398 key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
399 key &= slb_v;
400
401 /* Calculate permissions */
402 gpte->may_read = hpte_read_permission(pp, key);
403 gpte->may_write = hpte_write_permission(pp, key);
404 gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G));
405
406 /* Storage key permission check for POWER7 */
407 if (data && virtmode) {
408 int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr);
409 if (amrfield & 1)
410 gpte->may_read = 0;
411 if (amrfield & 2)
412 gpte->may_write = 0;
413 }
414
415 /* Get the guest physical address */
416 gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr);
417 return 0;
418 }
419
420 /*
421 * Quick test for whether an instruction is a load or a store.
422 * If the instruction is a load or a store, then this will indicate
423 * which it is, at least on server processors. (Embedded processors
424 * have some external PID instructions that don't follow the rule
425 * embodied here.) If the instruction isn't a load or store, then
426 * this doesn't return anything useful.
427 */
428 static int instruction_is_store(unsigned int instr)
429 {
430 unsigned int mask;
431
432 mask = 0x10000000;
433 if ((instr & 0xfc000000) == 0x7c000000)
434 mask = 0x100; /* major opcode 31 */
435 return (instr & mask) != 0;
436 }
437
438 int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu,
439 unsigned long gpa, gva_t ea, int is_store)
440 {
441 u32 last_inst;
442
443 /*
444 * If we fail, we just return to the guest and try executing it again.
445 */
446 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
447 EMULATE_DONE)
448 return RESUME_GUEST;
449
450 /*
451 * WARNING: We do not know for sure whether the instruction we just
452 * read from memory is the same that caused the fault in the first
453 * place. If the instruction we read is neither an load or a store,
454 * then it can't access memory, so we don't need to worry about
455 * enforcing access permissions. So, assuming it is a load or
456 * store, we just check that its direction (load or store) is
457 * consistent with the original fault, since that's what we
458 * checked the access permissions against. If there is a mismatch
459 * we just return and retry the instruction.
460 */
461
462 if (instruction_is_store(last_inst) != !!is_store)
463 return RESUME_GUEST;
464
465 /*
466 * Emulated accesses are emulated by looking at the hash for
467 * translation once, then performing the access later. The
468 * translation could be invalidated in the meantime in which
469 * point performing the subsequent memory access on the old
470 * physical address could possibly be a security hole for the
471 * guest (but not the host).
472 *
473 * This is less of an issue for MMIO stores since they aren't
474 * globally visible. It could be an issue for MMIO loads to
475 * a certain extent but we'll ignore it for now.
476 */
477
478 vcpu->arch.paddr_accessed = gpa;
479 vcpu->arch.vaddr_accessed = ea;
480 return kvmppc_emulate_mmio(run, vcpu);
481 }
482
483 int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
484 unsigned long ea, unsigned long dsisr)
485 {
486 struct kvm *kvm = vcpu->kvm;
487 unsigned long hpte[3], r;
488 unsigned long hnow_v, hnow_r;
489 __be64 *hptep;
490 unsigned long mmu_seq, psize, pte_size;
491 unsigned long gpa_base, gfn_base;
492 unsigned long gpa, gfn, hva, pfn;
493 struct kvm_memory_slot *memslot;
494 unsigned long *rmap;
495 struct revmap_entry *rev;
496 struct page *page, *pages[1];
497 long index, ret, npages;
498 bool is_ci;
499 unsigned int writing, write_ok;
500 struct vm_area_struct *vma;
501 unsigned long rcbits;
502 long mmio_update;
503
504 if (kvm_is_radix(kvm))
505 return kvmppc_book3s_radix_page_fault(run, vcpu, ea, dsisr);
506
507 /*
508 * Real-mode code has already searched the HPT and found the
509 * entry we're interested in. Lock the entry and check that
510 * it hasn't changed. If it has, just return and re-execute the
511 * instruction.
512 */
513 if (ea != vcpu->arch.pgfault_addr)
514 return RESUME_GUEST;
515
516 if (vcpu->arch.pgfault_cache) {
517 mmio_update = atomic64_read(&kvm->arch.mmio_update);
518 if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) {
519 r = vcpu->arch.pgfault_cache->rpte;
520 psize = kvmppc_actual_pgsz(vcpu->arch.pgfault_hpte[0],
521 r);
522 gpa_base = r & HPTE_R_RPN & ~(psize - 1);
523 gfn_base = gpa_base >> PAGE_SHIFT;
524 gpa = gpa_base | (ea & (psize - 1));
525 return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
526 dsisr & DSISR_ISSTORE);
527 }
528 }
529 index = vcpu->arch.pgfault_index;
530 hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
531 rev = &kvm->arch.hpt.rev[index];
532 preempt_disable();
533 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
534 cpu_relax();
535 hpte[0] = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK;
536 hpte[1] = be64_to_cpu(hptep[1]);
537 hpte[2] = r = rev->guest_rpte;
538 unlock_hpte(hptep, hpte[0]);
539 preempt_enable();
540
541 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
542 hpte[0] = hpte_new_to_old_v(hpte[0], hpte[1]);
543 hpte[1] = hpte_new_to_old_r(hpte[1]);
544 }
545 if (hpte[0] != vcpu->arch.pgfault_hpte[0] ||
546 hpte[1] != vcpu->arch.pgfault_hpte[1])
547 return RESUME_GUEST;
548
549 /* Translate the logical address and get the page */
550 psize = kvmppc_actual_pgsz(hpte[0], r);
551 gpa_base = r & HPTE_R_RPN & ~(psize - 1);
552 gfn_base = gpa_base >> PAGE_SHIFT;
553 gpa = gpa_base | (ea & (psize - 1));
554 gfn = gpa >> PAGE_SHIFT;
555 memslot = gfn_to_memslot(kvm, gfn);
556
557 trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr);
558
559 /* No memslot means it's an emulated MMIO region */
560 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
561 return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
562 dsisr & DSISR_ISSTORE);
563
564 /*
565 * This should never happen, because of the slot_is_aligned()
566 * check in kvmppc_do_h_enter().
567 */
568 if (gfn_base < memslot->base_gfn)
569 return -EFAULT;
570
571 /* used to check for invalidations in progress */
572 mmu_seq = kvm->mmu_notifier_seq;
573 smp_rmb();
574
575 ret = -EFAULT;
576 is_ci = false;
577 pfn = 0;
578 page = NULL;
579 pte_size = PAGE_SIZE;
580 writing = (dsisr & DSISR_ISSTORE) != 0;
581 /* If writing != 0, then the HPTE must allow writing, if we get here */
582 write_ok = writing;
583 hva = gfn_to_hva_memslot(memslot, gfn);
584 npages = get_user_pages_fast(hva, 1, writing, pages);
585 if (npages < 1) {
586 /* Check if it's an I/O mapping */
587 down_read(&current->mm->mmap_sem);
588 vma = find_vma(current->mm, hva);
589 if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end &&
590 (vma->vm_flags & VM_PFNMAP)) {
591 pfn = vma->vm_pgoff +
592 ((hva - vma->vm_start) >> PAGE_SHIFT);
593 pte_size = psize;
594 is_ci = pte_ci(__pte((pgprot_val(vma->vm_page_prot))));
595 write_ok = vma->vm_flags & VM_WRITE;
596 }
597 up_read(&current->mm->mmap_sem);
598 if (!pfn)
599 goto out_put;
600 } else {
601 page = pages[0];
602 pfn = page_to_pfn(page);
603 if (PageHuge(page)) {
604 page = compound_head(page);
605 pte_size <<= compound_order(page);
606 }
607 /* if the guest wants write access, see if that is OK */
608 if (!writing && hpte_is_writable(r)) {
609 pte_t *ptep, pte;
610 unsigned long flags;
611 /*
612 * We need to protect against page table destruction
613 * hugepage split and collapse.
614 */
615 local_irq_save(flags);
616 ptep = find_current_mm_pte(current->mm->pgd,
617 hva, NULL, NULL);
618 if (ptep) {
619 pte = kvmppc_read_update_linux_pte(ptep, 1);
620 if (__pte_write(pte))
621 write_ok = 1;
622 }
623 local_irq_restore(flags);
624 }
625 }
626
627 if (psize > pte_size)
628 goto out_put;
629
630 /* Check WIMG vs. the actual page we're accessing */
631 if (!hpte_cache_flags_ok(r, is_ci)) {
632 if (is_ci)
633 goto out_put;
634 /*
635 * Allow guest to map emulated device memory as
636 * uncacheable, but actually make it cacheable.
637 */
638 r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M;
639 }
640
641 /*
642 * Set the HPTE to point to pfn.
643 * Since the pfn is at PAGE_SIZE granularity, make sure we
644 * don't mask out lower-order bits if psize < PAGE_SIZE.
645 */
646 if (psize < PAGE_SIZE)
647 psize = PAGE_SIZE;
648 r = (r & HPTE_R_KEY_HI) | (r & ~(HPTE_R_PP0 - psize)) |
649 ((pfn << PAGE_SHIFT) & ~(psize - 1));
650 if (hpte_is_writable(r) && !write_ok)
651 r = hpte_make_readonly(r);
652 ret = RESUME_GUEST;
653 preempt_disable();
654 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
655 cpu_relax();
656 hnow_v = be64_to_cpu(hptep[0]);
657 hnow_r = be64_to_cpu(hptep[1]);
658 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
659 hnow_v = hpte_new_to_old_v(hnow_v, hnow_r);
660 hnow_r = hpte_new_to_old_r(hnow_r);
661 }
662
663 /*
664 * If the HPT is being resized, don't update the HPTE,
665 * instead let the guest retry after the resize operation is complete.
666 * The synchronization for mmu_ready test vs. set is provided
667 * by the HPTE lock.
668 */
669 if (!kvm->arch.mmu_ready)
670 goto out_unlock;
671
672 if ((hnow_v & ~HPTE_V_HVLOCK) != hpte[0] || hnow_r != hpte[1] ||
673 rev->guest_rpte != hpte[2])
674 /* HPTE has been changed under us; let the guest retry */
675 goto out_unlock;
676 hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID;
677
678 /* Always put the HPTE in the rmap chain for the page base address */
679 rmap = &memslot->arch.rmap[gfn_base - memslot->base_gfn];
680 lock_rmap(rmap);
681
682 /* Check if we might have been invalidated; let the guest retry if so */
683 ret = RESUME_GUEST;
684 if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) {
685 unlock_rmap(rmap);
686 goto out_unlock;
687 }
688
689 /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */
690 rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT;
691 r &= rcbits | ~(HPTE_R_R | HPTE_R_C);
692
693 if (be64_to_cpu(hptep[0]) & HPTE_V_VALID) {
694 /* HPTE was previously valid, so we need to invalidate it */
695 unlock_rmap(rmap);
696 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
697 kvmppc_invalidate_hpte(kvm, hptep, index);
698 /* don't lose previous R and C bits */
699 r |= be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
700 } else {
701 kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0);
702 }
703
704 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
705 r = hpte_old_to_new_r(hpte[0], r);
706 hpte[0] = hpte_old_to_new_v(hpte[0]);
707 }
708 hptep[1] = cpu_to_be64(r);
709 eieio();
710 __unlock_hpte(hptep, hpte[0]);
711 asm volatile("ptesync" : : : "memory");
712 preempt_enable();
713 if (page && hpte_is_writable(r))
714 SetPageDirty(page);
715
716 out_put:
717 trace_kvm_page_fault_exit(vcpu, hpte, ret);
718
719 if (page) {
720 /*
721 * We drop pages[0] here, not page because page might
722 * have been set to the head page of a compound, but
723 * we have to drop the reference on the correct tail
724 * page to match the get inside gup()
725 */
726 put_page(pages[0]);
727 }
728 return ret;
729
730 out_unlock:
731 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
732 preempt_enable();
733 goto out_put;
734 }
735
736 void kvmppc_rmap_reset(struct kvm *kvm)
737 {
738 struct kvm_memslots *slots;
739 struct kvm_memory_slot *memslot;
740 int srcu_idx;
741
742 srcu_idx = srcu_read_lock(&kvm->srcu);
743 slots = kvm_memslots(kvm);
744 kvm_for_each_memslot(memslot, slots) {
745 /*
746 * This assumes it is acceptable to lose reference and
747 * change bits across a reset.
748 */
749 memset(memslot->arch.rmap, 0,
750 memslot->npages * sizeof(*memslot->arch.rmap));
751 }
752 srcu_read_unlock(&kvm->srcu, srcu_idx);
753 }
754
755 typedef int (*hva_handler_fn)(struct kvm *kvm, struct kvm_memory_slot *memslot,
756 unsigned long gfn);
757
758 static int kvm_handle_hva_range(struct kvm *kvm,
759 unsigned long start,
760 unsigned long end,
761 hva_handler_fn handler)
762 {
763 int ret;
764 int retval = 0;
765 struct kvm_memslots *slots;
766 struct kvm_memory_slot *memslot;
767
768 slots = kvm_memslots(kvm);
769 kvm_for_each_memslot(memslot, slots) {
770 unsigned long hva_start, hva_end;
771 gfn_t gfn, gfn_end;
772
773 hva_start = max(start, memslot->userspace_addr);
774 hva_end = min(end, memslot->userspace_addr +
775 (memslot->npages << PAGE_SHIFT));
776 if (hva_start >= hva_end)
777 continue;
778 /*
779 * {gfn(page) | page intersects with [hva_start, hva_end)} =
780 * {gfn, gfn+1, ..., gfn_end-1}.
781 */
782 gfn = hva_to_gfn_memslot(hva_start, memslot);
783 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
784
785 for (; gfn < gfn_end; ++gfn) {
786 ret = handler(kvm, memslot, gfn);
787 retval |= ret;
788 }
789 }
790
791 return retval;
792 }
793
794 static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
795 hva_handler_fn handler)
796 {
797 return kvm_handle_hva_range(kvm, hva, hva + 1, handler);
798 }
799
800 /* Must be called with both HPTE and rmap locked */
801 static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i,
802 struct kvm_memory_slot *memslot,
803 unsigned long *rmapp, unsigned long gfn)
804 {
805 __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
806 struct revmap_entry *rev = kvm->arch.hpt.rev;
807 unsigned long j, h;
808 unsigned long ptel, psize, rcbits;
809
810 j = rev[i].forw;
811 if (j == i) {
812 /* chain is now empty */
813 *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
814 } else {
815 /* remove i from chain */
816 h = rev[i].back;
817 rev[h].forw = j;
818 rev[j].back = h;
819 rev[i].forw = rev[i].back = i;
820 *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j;
821 }
822
823 /* Now check and modify the HPTE */
824 ptel = rev[i].guest_rpte;
825 psize = kvmppc_actual_pgsz(be64_to_cpu(hptep[0]), ptel);
826 if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
827 hpte_rpn(ptel, psize) == gfn) {
828 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
829 kvmppc_invalidate_hpte(kvm, hptep, i);
830 hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
831 /* Harvest R and C */
832 rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
833 *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT;
834 if ((rcbits & HPTE_R_C) && memslot->dirty_bitmap)
835 kvmppc_update_dirty_map(memslot, gfn, psize);
836 if (rcbits & ~rev[i].guest_rpte) {
837 rev[i].guest_rpte = ptel | rcbits;
838 note_hpte_modification(kvm, &rev[i]);
839 }
840 }
841 }
842
843 static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
844 unsigned long gfn)
845 {
846 unsigned long i;
847 __be64 *hptep;
848 unsigned long *rmapp;
849
850 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
851 for (;;) {
852 lock_rmap(rmapp);
853 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
854 unlock_rmap(rmapp);
855 break;
856 }
857
858 /*
859 * To avoid an ABBA deadlock with the HPTE lock bit,
860 * we can't spin on the HPTE lock while holding the
861 * rmap chain lock.
862 */
863 i = *rmapp & KVMPPC_RMAP_INDEX;
864 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
865 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
866 /* unlock rmap before spinning on the HPTE lock */
867 unlock_rmap(rmapp);
868 while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK)
869 cpu_relax();
870 continue;
871 }
872
873 kvmppc_unmap_hpte(kvm, i, memslot, rmapp, gfn);
874 unlock_rmap(rmapp);
875 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
876 }
877 return 0;
878 }
879
880 int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva)
881 {
882 hva_handler_fn handler;
883
884 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
885 kvm_handle_hva(kvm, hva, handler);
886 return 0;
887 }
888
889 int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end)
890 {
891 hva_handler_fn handler;
892
893 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
894 kvm_handle_hva_range(kvm, start, end, handler);
895 return 0;
896 }
897
898 void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
899 struct kvm_memory_slot *memslot)
900 {
901 unsigned long gfn;
902 unsigned long n;
903 unsigned long *rmapp;
904
905 gfn = memslot->base_gfn;
906 rmapp = memslot->arch.rmap;
907 for (n = memslot->npages; n; --n, ++gfn) {
908 if (kvm_is_radix(kvm)) {
909 kvm_unmap_radix(kvm, memslot, gfn);
910 continue;
911 }
912 /*
913 * Testing the present bit without locking is OK because
914 * the memslot has been marked invalid already, and hence
915 * no new HPTEs referencing this page can be created,
916 * thus the present bit can't go from 0 to 1.
917 */
918 if (*rmapp & KVMPPC_RMAP_PRESENT)
919 kvm_unmap_rmapp(kvm, memslot, gfn);
920 ++rmapp;
921 }
922 }
923
924 static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
925 unsigned long gfn)
926 {
927 struct revmap_entry *rev = kvm->arch.hpt.rev;
928 unsigned long head, i, j;
929 __be64 *hptep;
930 int ret = 0;
931 unsigned long *rmapp;
932
933 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
934 retry:
935 lock_rmap(rmapp);
936 if (*rmapp & KVMPPC_RMAP_REFERENCED) {
937 *rmapp &= ~KVMPPC_RMAP_REFERENCED;
938 ret = 1;
939 }
940 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
941 unlock_rmap(rmapp);
942 return ret;
943 }
944
945 i = head = *rmapp & KVMPPC_RMAP_INDEX;
946 do {
947 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
948 j = rev[i].forw;
949
950 /* If this HPTE isn't referenced, ignore it */
951 if (!(be64_to_cpu(hptep[1]) & HPTE_R_R))
952 continue;
953
954 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
955 /* unlock rmap before spinning on the HPTE lock */
956 unlock_rmap(rmapp);
957 while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK)
958 cpu_relax();
959 goto retry;
960 }
961
962 /* Now check and modify the HPTE */
963 if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
964 (be64_to_cpu(hptep[1]) & HPTE_R_R)) {
965 kvmppc_clear_ref_hpte(kvm, hptep, i);
966 if (!(rev[i].guest_rpte & HPTE_R_R)) {
967 rev[i].guest_rpte |= HPTE_R_R;
968 note_hpte_modification(kvm, &rev[i]);
969 }
970 ret = 1;
971 }
972 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
973 } while ((i = j) != head);
974
975 unlock_rmap(rmapp);
976 return ret;
977 }
978
979 int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end)
980 {
981 hva_handler_fn handler;
982
983 handler = kvm_is_radix(kvm) ? kvm_age_radix : kvm_age_rmapp;
984 return kvm_handle_hva_range(kvm, start, end, handler);
985 }
986
987 static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
988 unsigned long gfn)
989 {
990 struct revmap_entry *rev = kvm->arch.hpt.rev;
991 unsigned long head, i, j;
992 unsigned long *hp;
993 int ret = 1;
994 unsigned long *rmapp;
995
996 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
997 if (*rmapp & KVMPPC_RMAP_REFERENCED)
998 return 1;
999
1000 lock_rmap(rmapp);
1001 if (*rmapp & KVMPPC_RMAP_REFERENCED)
1002 goto out;
1003
1004 if (*rmapp & KVMPPC_RMAP_PRESENT) {
1005 i = head = *rmapp & KVMPPC_RMAP_INDEX;
1006 do {
1007 hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4));
1008 j = rev[i].forw;
1009 if (be64_to_cpu(hp[1]) & HPTE_R_R)
1010 goto out;
1011 } while ((i = j) != head);
1012 }
1013 ret = 0;
1014
1015 out:
1016 unlock_rmap(rmapp);
1017 return ret;
1018 }
1019
1020 int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva)
1021 {
1022 hva_handler_fn handler;
1023
1024 handler = kvm_is_radix(kvm) ? kvm_test_age_radix : kvm_test_age_rmapp;
1025 return kvm_handle_hva(kvm, hva, handler);
1026 }
1027
1028 void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte)
1029 {
1030 hva_handler_fn handler;
1031
1032 handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp;
1033 kvm_handle_hva(kvm, hva, handler);
1034 }
1035
1036 static int vcpus_running(struct kvm *kvm)
1037 {
1038 return atomic_read(&kvm->arch.vcpus_running) != 0;
1039 }
1040
1041 /*
1042 * Returns the number of system pages that are dirty.
1043 * This can be more than 1 if we find a huge-page HPTE.
1044 */
1045 static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp)
1046 {
1047 struct revmap_entry *rev = kvm->arch.hpt.rev;
1048 unsigned long head, i, j;
1049 unsigned long n;
1050 unsigned long v, r;
1051 __be64 *hptep;
1052 int npages_dirty = 0;
1053
1054 retry:
1055 lock_rmap(rmapp);
1056 if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
1057 unlock_rmap(rmapp);
1058 return npages_dirty;
1059 }
1060
1061 i = head = *rmapp & KVMPPC_RMAP_INDEX;
1062 do {
1063 unsigned long hptep1;
1064 hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
1065 j = rev[i].forw;
1066
1067 /*
1068 * Checking the C (changed) bit here is racy since there
1069 * is no guarantee about when the hardware writes it back.
1070 * If the HPTE is not writable then it is stable since the
1071 * page can't be written to, and we would have done a tlbie
1072 * (which forces the hardware to complete any writeback)
1073 * when making the HPTE read-only.
1074 * If vcpus are running then this call is racy anyway
1075 * since the page could get dirtied subsequently, so we
1076 * expect there to be a further call which would pick up
1077 * any delayed C bit writeback.
1078 * Otherwise we need to do the tlbie even if C==0 in
1079 * order to pick up any delayed writeback of C.
1080 */
1081 hptep1 = be64_to_cpu(hptep[1]);
1082 if (!(hptep1 & HPTE_R_C) &&
1083 (!hpte_is_writable(hptep1) || vcpus_running(kvm)))
1084 continue;
1085
1086 if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
1087 /* unlock rmap before spinning on the HPTE lock */
1088 unlock_rmap(rmapp);
1089 while (hptep[0] & cpu_to_be64(HPTE_V_HVLOCK))
1090 cpu_relax();
1091 goto retry;
1092 }
1093
1094 /* Now check and modify the HPTE */
1095 if (!(hptep[0] & cpu_to_be64(HPTE_V_VALID))) {
1096 __unlock_hpte(hptep, be64_to_cpu(hptep[0]));
1097 continue;
1098 }
1099
1100 /* need to make it temporarily absent so C is stable */
1101 hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
1102 kvmppc_invalidate_hpte(kvm, hptep, i);
1103 v = be64_to_cpu(hptep[0]);
1104 r = be64_to_cpu(hptep[1]);
1105 if (r & HPTE_R_C) {
1106 hptep[1] = cpu_to_be64(r & ~HPTE_R_C);
1107 if (!(rev[i].guest_rpte & HPTE_R_C)) {
1108 rev[i].guest_rpte |= HPTE_R_C;
1109 note_hpte_modification(kvm, &rev[i]);
1110 }
1111 n = kvmppc_actual_pgsz(v, r);
1112 n = (n + PAGE_SIZE - 1) >> PAGE_SHIFT;
1113 if (n > npages_dirty)
1114 npages_dirty = n;
1115 eieio();
1116 }
1117 v &= ~HPTE_V_ABSENT;
1118 v |= HPTE_V_VALID;
1119 __unlock_hpte(hptep, v);
1120 } while ((i = j) != head);
1121
1122 unlock_rmap(rmapp);
1123 return npages_dirty;
1124 }
1125
1126 void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa,
1127 struct kvm_memory_slot *memslot,
1128 unsigned long *map)
1129 {
1130 unsigned long gfn;
1131
1132 if (!vpa->dirty || !vpa->pinned_addr)
1133 return;
1134 gfn = vpa->gpa >> PAGE_SHIFT;
1135 if (gfn < memslot->base_gfn ||
1136 gfn >= memslot->base_gfn + memslot->npages)
1137 return;
1138
1139 vpa->dirty = false;
1140 if (map)
1141 __set_bit_le(gfn - memslot->base_gfn, map);
1142 }
1143
1144 long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm,
1145 struct kvm_memory_slot *memslot, unsigned long *map)
1146 {
1147 unsigned long i;
1148 unsigned long *rmapp;
1149
1150 preempt_disable();
1151 rmapp = memslot->arch.rmap;
1152 for (i = 0; i < memslot->npages; ++i) {
1153 int npages = kvm_test_clear_dirty_npages(kvm, rmapp);
1154 /*
1155 * Note that if npages > 0 then i must be a multiple of npages,
1156 * since we always put huge-page HPTEs in the rmap chain
1157 * corresponding to their page base address.
1158 */
1159 if (npages)
1160 set_dirty_bits(map, i, npages);
1161 ++rmapp;
1162 }
1163 preempt_enable();
1164 return 0;
1165 }
1166
1167 void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
1168 unsigned long *nb_ret)
1169 {
1170 struct kvm_memory_slot *memslot;
1171 unsigned long gfn = gpa >> PAGE_SHIFT;
1172 struct page *page, *pages[1];
1173 int npages;
1174 unsigned long hva, offset;
1175 int srcu_idx;
1176
1177 srcu_idx = srcu_read_lock(&kvm->srcu);
1178 memslot = gfn_to_memslot(kvm, gfn);
1179 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
1180 goto err;
1181 hva = gfn_to_hva_memslot(memslot, gfn);
1182 npages = get_user_pages_fast(hva, 1, 1, pages);
1183 if (npages < 1)
1184 goto err;
1185 page = pages[0];
1186 srcu_read_unlock(&kvm->srcu, srcu_idx);
1187
1188 offset = gpa & (PAGE_SIZE - 1);
1189 if (nb_ret)
1190 *nb_ret = PAGE_SIZE - offset;
1191 return page_address(page) + offset;
1192
1193 err:
1194 srcu_read_unlock(&kvm->srcu, srcu_idx);
1195 return NULL;
1196 }
1197
1198 void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa,
1199 bool dirty)
1200 {
1201 struct page *page = virt_to_page(va);
1202 struct kvm_memory_slot *memslot;
1203 unsigned long gfn;
1204 int srcu_idx;
1205
1206 put_page(page);
1207
1208 if (!dirty)
1209 return;
1210
1211 /* We need to mark this page dirty in the memslot dirty_bitmap, if any */
1212 gfn = gpa >> PAGE_SHIFT;
1213 srcu_idx = srcu_read_lock(&kvm->srcu);
1214 memslot = gfn_to_memslot(kvm, gfn);
1215 if (memslot && memslot->dirty_bitmap)
1216 set_bit_le(gfn - memslot->base_gfn, memslot->dirty_bitmap);
1217 srcu_read_unlock(&kvm->srcu, srcu_idx);
1218 }
1219
1220 /*
1221 * HPT resizing
1222 */
1223 static int resize_hpt_allocate(struct kvm_resize_hpt *resize)
1224 {
1225 int rc;
1226
1227 rc = kvmppc_allocate_hpt(&resize->hpt, resize->order);
1228 if (rc < 0)
1229 return rc;
1230
1231 resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n",
1232 resize->hpt.virt);
1233
1234 return 0;
1235 }
1236
1237 static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize,
1238 unsigned long idx)
1239 {
1240 struct kvm *kvm = resize->kvm;
1241 struct kvm_hpt_info *old = &kvm->arch.hpt;
1242 struct kvm_hpt_info *new = &resize->hpt;
1243 unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1;
1244 unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1;
1245 __be64 *hptep, *new_hptep;
1246 unsigned long vpte, rpte, guest_rpte;
1247 int ret;
1248 struct revmap_entry *rev;
1249 unsigned long apsize, avpn, pteg, hash;
1250 unsigned long new_idx, new_pteg, replace_vpte;
1251 int pshift;
1252
1253 hptep = (__be64 *)(old->virt + (idx << 4));
1254
1255 /* Guest is stopped, so new HPTEs can't be added or faulted
1256 * in, only unmapped or altered by host actions. So, it's
1257 * safe to check this before we take the HPTE lock */
1258 vpte = be64_to_cpu(hptep[0]);
1259 if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
1260 return 0; /* nothing to do */
1261
1262 while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
1263 cpu_relax();
1264
1265 vpte = be64_to_cpu(hptep[0]);
1266
1267 ret = 0;
1268 if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
1269 /* Nothing to do */
1270 goto out;
1271
1272 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1273 rpte = be64_to_cpu(hptep[1]);
1274 vpte = hpte_new_to_old_v(vpte, rpte);
1275 }
1276
1277 /* Unmap */
1278 rev = &old->rev[idx];
1279 guest_rpte = rev->guest_rpte;
1280
1281 ret = -EIO;
1282 apsize = kvmppc_actual_pgsz(vpte, guest_rpte);
1283 if (!apsize)
1284 goto out;
1285
1286 if (vpte & HPTE_V_VALID) {
1287 unsigned long gfn = hpte_rpn(guest_rpte, apsize);
1288 int srcu_idx = srcu_read_lock(&kvm->srcu);
1289 struct kvm_memory_slot *memslot =
1290 __gfn_to_memslot(kvm_memslots(kvm), gfn);
1291
1292 if (memslot) {
1293 unsigned long *rmapp;
1294 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
1295
1296 lock_rmap(rmapp);
1297 kvmppc_unmap_hpte(kvm, idx, memslot, rmapp, gfn);
1298 unlock_rmap(rmapp);
1299 }
1300
1301 srcu_read_unlock(&kvm->srcu, srcu_idx);
1302 }
1303
1304 /* Reload PTE after unmap */
1305 vpte = be64_to_cpu(hptep[0]);
1306 BUG_ON(vpte & HPTE_V_VALID);
1307 BUG_ON(!(vpte & HPTE_V_ABSENT));
1308
1309 ret = 0;
1310 if (!(vpte & HPTE_V_BOLTED))
1311 goto out;
1312
1313 rpte = be64_to_cpu(hptep[1]);
1314
1315 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1316 vpte = hpte_new_to_old_v(vpte, rpte);
1317 rpte = hpte_new_to_old_r(rpte);
1318 }
1319
1320 pshift = kvmppc_hpte_base_page_shift(vpte, rpte);
1321 avpn = HPTE_V_AVPN_VAL(vpte) & ~(((1ul << pshift) - 1) >> 23);
1322 pteg = idx / HPTES_PER_GROUP;
1323 if (vpte & HPTE_V_SECONDARY)
1324 pteg = ~pteg;
1325
1326 if (!(vpte & HPTE_V_1TB_SEG)) {
1327 unsigned long offset, vsid;
1328
1329 /* We only have 28 - 23 bits of offset in avpn */
1330 offset = (avpn & 0x1f) << 23;
1331 vsid = avpn >> 5;
1332 /* We can find more bits from the pteg value */
1333 if (pshift < 23)
1334 offset |= ((vsid ^ pteg) & old_hash_mask) << pshift;
1335
1336 hash = vsid ^ (offset >> pshift);
1337 } else {
1338 unsigned long offset, vsid;
1339
1340 /* We only have 40 - 23 bits of seg_off in avpn */
1341 offset = (avpn & 0x1ffff) << 23;
1342 vsid = avpn >> 17;
1343 if (pshift < 23)
1344 offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) << pshift;
1345
1346 hash = vsid ^ (vsid << 25) ^ (offset >> pshift);
1347 }
1348
1349 new_pteg = hash & new_hash_mask;
1350 if (vpte & HPTE_V_SECONDARY)
1351 new_pteg = ~hash & new_hash_mask;
1352
1353 new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP);
1354 new_hptep = (__be64 *)(new->virt + (new_idx << 4));
1355
1356 replace_vpte = be64_to_cpu(new_hptep[0]);
1357 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1358 unsigned long replace_rpte = be64_to_cpu(new_hptep[1]);
1359 replace_vpte = hpte_new_to_old_v(replace_vpte, replace_rpte);
1360 }
1361
1362 if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
1363 BUG_ON(new->order >= old->order);
1364
1365 if (replace_vpte & HPTE_V_BOLTED) {
1366 if (vpte & HPTE_V_BOLTED)
1367 /* Bolted collision, nothing we can do */
1368 ret = -ENOSPC;
1369 /* Discard the new HPTE */
1370 goto out;
1371 }
1372
1373 /* Discard the previous HPTE */
1374 }
1375
1376 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1377 rpte = hpte_old_to_new_r(vpte, rpte);
1378 vpte = hpte_old_to_new_v(vpte);
1379 }
1380
1381 new_hptep[1] = cpu_to_be64(rpte);
1382 new->rev[new_idx].guest_rpte = guest_rpte;
1383 /* No need for a barrier, since new HPT isn't active */
1384 new_hptep[0] = cpu_to_be64(vpte);
1385 unlock_hpte(new_hptep, vpte);
1386
1387 out:
1388 unlock_hpte(hptep, vpte);
1389 return ret;
1390 }
1391
1392 static int resize_hpt_rehash(struct kvm_resize_hpt *resize)
1393 {
1394 struct kvm *kvm = resize->kvm;
1395 unsigned long i;
1396 int rc;
1397
1398 for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) {
1399 rc = resize_hpt_rehash_hpte(resize, i);
1400 if (rc != 0)
1401 return rc;
1402 }
1403
1404 return 0;
1405 }
1406
1407 static void resize_hpt_pivot(struct kvm_resize_hpt *resize)
1408 {
1409 struct kvm *kvm = resize->kvm;
1410 struct kvm_hpt_info hpt_tmp;
1411
1412 /* Exchange the pending tables in the resize structure with
1413 * the active tables */
1414
1415 resize_hpt_debug(resize, "resize_hpt_pivot()\n");
1416
1417 spin_lock(&kvm->mmu_lock);
1418 asm volatile("ptesync" : : : "memory");
1419
1420 hpt_tmp = kvm->arch.hpt;
1421 kvmppc_set_hpt(kvm, &resize->hpt);
1422 resize->hpt = hpt_tmp;
1423
1424 spin_unlock(&kvm->mmu_lock);
1425
1426 synchronize_srcu_expedited(&kvm->srcu);
1427
1428 if (cpu_has_feature(CPU_FTR_ARCH_300))
1429 kvmppc_setup_partition_table(kvm);
1430
1431 resize_hpt_debug(resize, "resize_hpt_pivot() done\n");
1432 }
1433
1434 static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize)
1435 {
1436 if (WARN_ON(!mutex_is_locked(&kvm->lock)))
1437 return;
1438
1439 if (!resize)
1440 return;
1441
1442 if (resize->error != -EBUSY) {
1443 if (resize->hpt.virt)
1444 kvmppc_free_hpt(&resize->hpt);
1445 kfree(resize);
1446 }
1447
1448 if (kvm->arch.resize_hpt == resize)
1449 kvm->arch.resize_hpt = NULL;
1450 }
1451
1452 static void resize_hpt_prepare_work(struct work_struct *work)
1453 {
1454 struct kvm_resize_hpt *resize = container_of(work,
1455 struct kvm_resize_hpt,
1456 work);
1457 struct kvm *kvm = resize->kvm;
1458 int err = 0;
1459
1460 if (WARN_ON(resize->error != -EBUSY))
1461 return;
1462
1463 mutex_lock(&kvm->lock);
1464
1465 /* Request is still current? */
1466 if (kvm->arch.resize_hpt == resize) {
1467 /* We may request large allocations here:
1468 * do not sleep with kvm->lock held for a while.
1469 */
1470 mutex_unlock(&kvm->lock);
1471
1472 resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n",
1473 resize->order);
1474
1475 err = resize_hpt_allocate(resize);
1476
1477 /* We have strict assumption about -EBUSY
1478 * when preparing for HPT resize.
1479 */
1480 if (WARN_ON(err == -EBUSY))
1481 err = -EINPROGRESS;
1482
1483 mutex_lock(&kvm->lock);
1484 /* It is possible that kvm->arch.resize_hpt != resize
1485 * after we grab kvm->lock again.
1486 */
1487 }
1488
1489 resize->error = err;
1490
1491 if (kvm->arch.resize_hpt != resize)
1492 resize_hpt_release(kvm, resize);
1493
1494 mutex_unlock(&kvm->lock);
1495 }
1496
1497 long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
1498 struct kvm_ppc_resize_hpt *rhpt)
1499 {
1500 unsigned long flags = rhpt->flags;
1501 unsigned long shift = rhpt->shift;
1502 struct kvm_resize_hpt *resize;
1503 int ret;
1504
1505 if (flags != 0 || kvm_is_radix(kvm))
1506 return -EINVAL;
1507
1508 if (shift && ((shift < 18) || (shift > 46)))
1509 return -EINVAL;
1510
1511 mutex_lock(&kvm->lock);
1512
1513 resize = kvm->arch.resize_hpt;
1514
1515 if (resize) {
1516 if (resize->order == shift) {
1517 /* Suitable resize in progress? */
1518 ret = resize->error;
1519 if (ret == -EBUSY)
1520 ret = 100; /* estimated time in ms */
1521 else if (ret)
1522 resize_hpt_release(kvm, resize);
1523
1524 goto out;
1525 }
1526
1527 /* not suitable, cancel it */
1528 resize_hpt_release(kvm, resize);
1529 }
1530
1531 ret = 0;
1532 if (!shift)
1533 goto out; /* nothing to do */
1534
1535 /* start new resize */
1536
1537 resize = kzalloc(sizeof(*resize), GFP_KERNEL);
1538 if (!resize) {
1539 ret = -ENOMEM;
1540 goto out;
1541 }
1542
1543 resize->error = -EBUSY;
1544 resize->order = shift;
1545 resize->kvm = kvm;
1546 INIT_WORK(&resize->work, resize_hpt_prepare_work);
1547 kvm->arch.resize_hpt = resize;
1548
1549 schedule_work(&resize->work);
1550
1551 ret = 100; /* estimated time in ms */
1552
1553 out:
1554 mutex_unlock(&kvm->lock);
1555 return ret;
1556 }
1557
1558 static void resize_hpt_boot_vcpu(void *opaque)
1559 {
1560 /* Nothing to do, just force a KVM exit */
1561 }
1562
1563 long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm,
1564 struct kvm_ppc_resize_hpt *rhpt)
1565 {
1566 unsigned long flags = rhpt->flags;
1567 unsigned long shift = rhpt->shift;
1568 struct kvm_resize_hpt *resize;
1569 long ret;
1570
1571 if (flags != 0 || kvm_is_radix(kvm))
1572 return -EINVAL;
1573
1574 if (shift && ((shift < 18) || (shift > 46)))
1575 return -EINVAL;
1576
1577 mutex_lock(&kvm->lock);
1578
1579 resize = kvm->arch.resize_hpt;
1580
1581 /* This shouldn't be possible */
1582 ret = -EIO;
1583 if (WARN_ON(!kvm->arch.mmu_ready))
1584 goto out_no_hpt;
1585
1586 /* Stop VCPUs from running while we mess with the HPT */
1587 kvm->arch.mmu_ready = 0;
1588 smp_mb();
1589
1590 /* Boot all CPUs out of the guest so they re-read
1591 * mmu_ready */
1592 on_each_cpu(resize_hpt_boot_vcpu, NULL, 1);
1593
1594 ret = -ENXIO;
1595 if (!resize || (resize->order != shift))
1596 goto out;
1597
1598 ret = resize->error;
1599 if (ret)
1600 goto out;
1601
1602 ret = resize_hpt_rehash(resize);
1603 if (ret)
1604 goto out;
1605
1606 resize_hpt_pivot(resize);
1607
1608 out:
1609 /* Let VCPUs run again */
1610 kvm->arch.mmu_ready = 1;
1611 smp_mb();
1612 out_no_hpt:
1613 resize_hpt_release(kvm, resize);
1614 mutex_unlock(&kvm->lock);
1615 return ret;
1616 }
1617
1618 /*
1619 * Functions for reading and writing the hash table via reads and
1620 * writes on a file descriptor.
1621 *
1622 * Reads return the guest view of the hash table, which has to be
1623 * pieced together from the real hash table and the guest_rpte
1624 * values in the revmap array.
1625 *
1626 * On writes, each HPTE written is considered in turn, and if it
1627 * is valid, it is written to the HPT as if an H_ENTER with the
1628 * exact flag set was done. When the invalid count is non-zero
1629 * in the header written to the stream, the kernel will make
1630 * sure that that many HPTEs are invalid, and invalidate them
1631 * if not.
1632 */
1633
1634 struct kvm_htab_ctx {
1635 unsigned long index;
1636 unsigned long flags;
1637 struct kvm *kvm;
1638 int first_pass;
1639 };
1640
1641 #define HPTE_SIZE (2 * sizeof(unsigned long))
1642
1643 /*
1644 * Returns 1 if this HPT entry has been modified or has pending
1645 * R/C bit changes.
1646 */
1647 static int hpte_dirty(struct revmap_entry *revp, __be64 *hptp)
1648 {
1649 unsigned long rcbits_unset;
1650
1651 if (revp->guest_rpte & HPTE_GR_MODIFIED)
1652 return 1;
1653
1654 /* Also need to consider changes in reference and changed bits */
1655 rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C);
1656 if ((be64_to_cpu(hptp[0]) & HPTE_V_VALID) &&
1657 (be64_to_cpu(hptp[1]) & rcbits_unset))
1658 return 1;
1659
1660 return 0;
1661 }
1662
1663 static long record_hpte(unsigned long flags, __be64 *hptp,
1664 unsigned long *hpte, struct revmap_entry *revp,
1665 int want_valid, int first_pass)
1666 {
1667 unsigned long v, r, hr;
1668 unsigned long rcbits_unset;
1669 int ok = 1;
1670 int valid, dirty;
1671
1672 /* Unmodified entries are uninteresting except on the first pass */
1673 dirty = hpte_dirty(revp, hptp);
1674 if (!first_pass && !dirty)
1675 return 0;
1676
1677 valid = 0;
1678 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) {
1679 valid = 1;
1680 if ((flags & KVM_GET_HTAB_BOLTED_ONLY) &&
1681 !(be64_to_cpu(hptp[0]) & HPTE_V_BOLTED))
1682 valid = 0;
1683 }
1684 if (valid != want_valid)
1685 return 0;
1686
1687 v = r = 0;
1688 if (valid || dirty) {
1689 /* lock the HPTE so it's stable and read it */
1690 preempt_disable();
1691 while (!try_lock_hpte(hptp, HPTE_V_HVLOCK))
1692 cpu_relax();
1693 v = be64_to_cpu(hptp[0]);
1694 hr = be64_to_cpu(hptp[1]);
1695 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1696 v = hpte_new_to_old_v(v, hr);
1697 hr = hpte_new_to_old_r(hr);
1698 }
1699
1700 /* re-evaluate valid and dirty from synchronized HPTE value */
1701 valid = !!(v & HPTE_V_VALID);
1702 dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED);
1703
1704 /* Harvest R and C into guest view if necessary */
1705 rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C);
1706 if (valid && (rcbits_unset & hr)) {
1707 revp->guest_rpte |= (hr &
1708 (HPTE_R_R | HPTE_R_C)) | HPTE_GR_MODIFIED;
1709 dirty = 1;
1710 }
1711
1712 if (v & HPTE_V_ABSENT) {
1713 v &= ~HPTE_V_ABSENT;
1714 v |= HPTE_V_VALID;
1715 valid = 1;
1716 }
1717 if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED))
1718 valid = 0;
1719
1720 r = revp->guest_rpte;
1721 /* only clear modified if this is the right sort of entry */
1722 if (valid == want_valid && dirty) {
1723 r &= ~HPTE_GR_MODIFIED;
1724 revp->guest_rpte = r;
1725 }
1726 unlock_hpte(hptp, be64_to_cpu(hptp[0]));
1727 preempt_enable();
1728 if (!(valid == want_valid && (first_pass || dirty)))
1729 ok = 0;
1730 }
1731 hpte[0] = cpu_to_be64(v);
1732 hpte[1] = cpu_to_be64(r);
1733 return ok;
1734 }
1735
1736 static ssize_t kvm_htab_read(struct file *file, char __user *buf,
1737 size_t count, loff_t *ppos)
1738 {
1739 struct kvm_htab_ctx *ctx = file->private_data;
1740 struct kvm *kvm = ctx->kvm;
1741 struct kvm_get_htab_header hdr;
1742 __be64 *hptp;
1743 struct revmap_entry *revp;
1744 unsigned long i, nb, nw;
1745 unsigned long __user *lbuf;
1746 struct kvm_get_htab_header __user *hptr;
1747 unsigned long flags;
1748 int first_pass;
1749 unsigned long hpte[2];
1750
1751 if (!access_ok(VERIFY_WRITE, buf, count))
1752 return -EFAULT;
1753 if (kvm_is_radix(kvm))
1754 return 0;
1755
1756 first_pass = ctx->first_pass;
1757 flags = ctx->flags;
1758
1759 i = ctx->index;
1760 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
1761 revp = kvm->arch.hpt.rev + i;
1762 lbuf = (unsigned long __user *)buf;
1763
1764 nb = 0;
1765 while (nb + sizeof(hdr) + HPTE_SIZE < count) {
1766 /* Initialize header */
1767 hptr = (struct kvm_get_htab_header __user *)buf;
1768 hdr.n_valid = 0;
1769 hdr.n_invalid = 0;
1770 nw = nb;
1771 nb += sizeof(hdr);
1772 lbuf = (unsigned long __user *)(buf + sizeof(hdr));
1773
1774 /* Skip uninteresting entries, i.e. clean on not-first pass */
1775 if (!first_pass) {
1776 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1777 !hpte_dirty(revp, hptp)) {
1778 ++i;
1779 hptp += 2;
1780 ++revp;
1781 }
1782 }
1783 hdr.index = i;
1784
1785 /* Grab a series of valid entries */
1786 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1787 hdr.n_valid < 0xffff &&
1788 nb + HPTE_SIZE < count &&
1789 record_hpte(flags, hptp, hpte, revp, 1, first_pass)) {
1790 /* valid entry, write it out */
1791 ++hdr.n_valid;
1792 if (__put_user(hpte[0], lbuf) ||
1793 __put_user(hpte[1], lbuf + 1))
1794 return -EFAULT;
1795 nb += HPTE_SIZE;
1796 lbuf += 2;
1797 ++i;
1798 hptp += 2;
1799 ++revp;
1800 }
1801 /* Now skip invalid entries while we can */
1802 while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
1803 hdr.n_invalid < 0xffff &&
1804 record_hpte(flags, hptp, hpte, revp, 0, first_pass)) {
1805 /* found an invalid entry */
1806 ++hdr.n_invalid;
1807 ++i;
1808 hptp += 2;
1809 ++revp;
1810 }
1811
1812 if (hdr.n_valid || hdr.n_invalid) {
1813 /* write back the header */
1814 if (__copy_to_user(hptr, &hdr, sizeof(hdr)))
1815 return -EFAULT;
1816 nw = nb;
1817 buf = (char __user *)lbuf;
1818 } else {
1819 nb = nw;
1820 }
1821
1822 /* Check if we've wrapped around the hash table */
1823 if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
1824 i = 0;
1825 ctx->first_pass = 0;
1826 break;
1827 }
1828 }
1829
1830 ctx->index = i;
1831
1832 return nb;
1833 }
1834
1835 static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
1836 size_t count, loff_t *ppos)
1837 {
1838 struct kvm_htab_ctx *ctx = file->private_data;
1839 struct kvm *kvm = ctx->kvm;
1840 struct kvm_get_htab_header hdr;
1841 unsigned long i, j;
1842 unsigned long v, r;
1843 unsigned long __user *lbuf;
1844 __be64 *hptp;
1845 unsigned long tmp[2];
1846 ssize_t nb;
1847 long int err, ret;
1848 int mmu_ready;
1849 int pshift;
1850
1851 if (!access_ok(VERIFY_READ, buf, count))
1852 return -EFAULT;
1853 if (kvm_is_radix(kvm))
1854 return -EINVAL;
1855
1856 /* lock out vcpus from running while we're doing this */
1857 mutex_lock(&kvm->lock);
1858 mmu_ready = kvm->arch.mmu_ready;
1859 if (mmu_ready) {
1860 kvm->arch.mmu_ready = 0; /* temporarily */
1861 /* order mmu_ready vs. vcpus_running */
1862 smp_mb();
1863 if (atomic_read(&kvm->arch.vcpus_running)) {
1864 kvm->arch.mmu_ready = 1;
1865 mutex_unlock(&kvm->lock);
1866 return -EBUSY;
1867 }
1868 }
1869
1870 err = 0;
1871 for (nb = 0; nb + sizeof(hdr) <= count; ) {
1872 err = -EFAULT;
1873 if (__copy_from_user(&hdr, buf, sizeof(hdr)))
1874 break;
1875
1876 err = 0;
1877 if (nb + hdr.n_valid * HPTE_SIZE > count)
1878 break;
1879
1880 nb += sizeof(hdr);
1881 buf += sizeof(hdr);
1882
1883 err = -EINVAL;
1884 i = hdr.index;
1885 if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) ||
1886 i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt))
1887 break;
1888
1889 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
1890 lbuf = (unsigned long __user *)buf;
1891 for (j = 0; j < hdr.n_valid; ++j) {
1892 __be64 hpte_v;
1893 __be64 hpte_r;
1894
1895 err = -EFAULT;
1896 if (__get_user(hpte_v, lbuf) ||
1897 __get_user(hpte_r, lbuf + 1))
1898 goto out;
1899 v = be64_to_cpu(hpte_v);
1900 r = be64_to_cpu(hpte_r);
1901 err = -EINVAL;
1902 if (!(v & HPTE_V_VALID))
1903 goto out;
1904 pshift = kvmppc_hpte_base_page_shift(v, r);
1905 if (pshift <= 0)
1906 goto out;
1907 lbuf += 2;
1908 nb += HPTE_SIZE;
1909
1910 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))
1911 kvmppc_do_h_remove(kvm, 0, i, 0, tmp);
1912 err = -EIO;
1913 ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r,
1914 tmp);
1915 if (ret != H_SUCCESS) {
1916 pr_err("kvm_htab_write ret %ld i=%ld v=%lx "
1917 "r=%lx\n", ret, i, v, r);
1918 goto out;
1919 }
1920 if (!mmu_ready && is_vrma_hpte(v)) {
1921 unsigned long senc, lpcr;
1922
1923 senc = slb_pgsize_encoding(1ul << pshift);
1924 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
1925 (VRMA_VSID << SLB_VSID_SHIFT_1T);
1926 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
1927 lpcr = senc << (LPCR_VRMASD_SH - 4);
1928 kvmppc_update_lpcr(kvm, lpcr,
1929 LPCR_VRMASD);
1930 } else {
1931 kvmppc_setup_partition_table(kvm);
1932 }
1933 mmu_ready = 1;
1934 }
1935 ++i;
1936 hptp += 2;
1937 }
1938
1939 for (j = 0; j < hdr.n_invalid; ++j) {
1940 if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))
1941 kvmppc_do_h_remove(kvm, 0, i, 0, tmp);
1942 ++i;
1943 hptp += 2;
1944 }
1945 err = 0;
1946 }
1947
1948 out:
1949 /* Order HPTE updates vs. mmu_ready */
1950 smp_wmb();
1951 kvm->arch.mmu_ready = mmu_ready;
1952 mutex_unlock(&kvm->lock);
1953
1954 if (err)
1955 return err;
1956 return nb;
1957 }
1958
1959 static int kvm_htab_release(struct inode *inode, struct file *filp)
1960 {
1961 struct kvm_htab_ctx *ctx = filp->private_data;
1962
1963 filp->private_data = NULL;
1964 if (!(ctx->flags & KVM_GET_HTAB_WRITE))
1965 atomic_dec(&ctx->kvm->arch.hpte_mod_interest);
1966 kvm_put_kvm(ctx->kvm);
1967 kfree(ctx);
1968 return 0;
1969 }
1970
1971 static const struct file_operations kvm_htab_fops = {
1972 .read = kvm_htab_read,
1973 .write = kvm_htab_write,
1974 .llseek = default_llseek,
1975 .release = kvm_htab_release,
1976 };
1977
1978 int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf)
1979 {
1980 int ret;
1981 struct kvm_htab_ctx *ctx;
1982 int rwflag;
1983
1984 /* reject flags we don't recognize */
1985 if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE))
1986 return -EINVAL;
1987 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1988 if (!ctx)
1989 return -ENOMEM;
1990 kvm_get_kvm(kvm);
1991 ctx->kvm = kvm;
1992 ctx->index = ghf->start_index;
1993 ctx->flags = ghf->flags;
1994 ctx->first_pass = 1;
1995
1996 rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY;
1997 ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC);
1998 if (ret < 0) {
1999 kfree(ctx);
2000 kvm_put_kvm(kvm);
2001 return ret;
2002 }
2003
2004 if (rwflag == O_RDONLY) {
2005 mutex_lock(&kvm->slots_lock);
2006 atomic_inc(&kvm->arch.hpte_mod_interest);
2007 /* make sure kvmppc_do_h_enter etc. see the increment */
2008 synchronize_srcu_expedited(&kvm->srcu);
2009 mutex_unlock(&kvm->slots_lock);
2010 }
2011
2012 return ret;
2013 }
2014
2015 struct debugfs_htab_state {
2016 struct kvm *kvm;
2017 struct mutex mutex;
2018 unsigned long hpt_index;
2019 int chars_left;
2020 int buf_index;
2021 char buf[64];
2022 };
2023
2024 static int debugfs_htab_open(struct inode *inode, struct file *file)
2025 {
2026 struct kvm *kvm = inode->i_private;
2027 struct debugfs_htab_state *p;
2028
2029 p = kzalloc(sizeof(*p), GFP_KERNEL);
2030 if (!p)
2031 return -ENOMEM;
2032
2033 kvm_get_kvm(kvm);
2034 p->kvm = kvm;
2035 mutex_init(&p->mutex);
2036 file->private_data = p;
2037
2038 return nonseekable_open(inode, file);
2039 }
2040
2041 static int debugfs_htab_release(struct inode *inode, struct file *file)
2042 {
2043 struct debugfs_htab_state *p = file->private_data;
2044
2045 kvm_put_kvm(p->kvm);
2046 kfree(p);
2047 return 0;
2048 }
2049
2050 static ssize_t debugfs_htab_read(struct file *file, char __user *buf,
2051 size_t len, loff_t *ppos)
2052 {
2053 struct debugfs_htab_state *p = file->private_data;
2054 ssize_t ret, r;
2055 unsigned long i, n;
2056 unsigned long v, hr, gr;
2057 struct kvm *kvm;
2058 __be64 *hptp;
2059
2060 kvm = p->kvm;
2061 if (kvm_is_radix(kvm))
2062 return 0;
2063
2064 ret = mutex_lock_interruptible(&p->mutex);
2065 if (ret)
2066 return ret;
2067
2068 if (p->chars_left) {
2069 n = p->chars_left;
2070 if (n > len)
2071 n = len;
2072 r = copy_to_user(buf, p->buf + p->buf_index, n);
2073 n -= r;
2074 p->chars_left -= n;
2075 p->buf_index += n;
2076 buf += n;
2077 len -= n;
2078 ret = n;
2079 if (r) {
2080 if (!n)
2081 ret = -EFAULT;
2082 goto out;
2083 }
2084 }
2085
2086 i = p->hpt_index;
2087 hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
2088 for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt);
2089 ++i, hptp += 2) {
2090 if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)))
2091 continue;
2092
2093 /* lock the HPTE so it's stable and read it */
2094 preempt_disable();
2095 while (!try_lock_hpte(hptp, HPTE_V_HVLOCK))
2096 cpu_relax();
2097 v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK;
2098 hr = be64_to_cpu(hptp[1]);
2099 gr = kvm->arch.hpt.rev[i].guest_rpte;
2100 unlock_hpte(hptp, v);
2101 preempt_enable();
2102
2103 if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
2104 continue;
2105
2106 n = scnprintf(p->buf, sizeof(p->buf),
2107 "%6lx %.16lx %.16lx %.16lx\n",
2108 i, v, hr, gr);
2109 p->chars_left = n;
2110 if (n > len)
2111 n = len;
2112 r = copy_to_user(buf, p->buf, n);
2113 n -= r;
2114 p->chars_left -= n;
2115 p->buf_index = n;
2116 buf += n;
2117 len -= n;
2118 ret += n;
2119 if (r) {
2120 if (!ret)
2121 ret = -EFAULT;
2122 goto out;
2123 }
2124 }
2125 p->hpt_index = i;
2126
2127 out:
2128 mutex_unlock(&p->mutex);
2129 return ret;
2130 }
2131
2132 static ssize_t debugfs_htab_write(struct file *file, const char __user *buf,
2133 size_t len, loff_t *ppos)
2134 {
2135 return -EACCES;
2136 }
2137
2138 static const struct file_operations debugfs_htab_fops = {
2139 .owner = THIS_MODULE,
2140 .open = debugfs_htab_open,
2141 .release = debugfs_htab_release,
2142 .read = debugfs_htab_read,
2143 .write = debugfs_htab_write,
2144 .llseek = generic_file_llseek,
2145 };
2146
2147 void kvmppc_mmu_debugfs_init(struct kvm *kvm)
2148 {
2149 kvm->arch.htab_dentry = debugfs_create_file("htab", 0400,
2150 kvm->arch.debugfs_dir, kvm,
2151 &debugfs_htab_fops);
2152 }
2153
2154 void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
2155 {
2156 struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
2157
2158 vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */
2159
2160 mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
2161 mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
2162
2163 vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
2164 }
CRIS linux kernel tree