Commit | Line | Data |
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de56a948 PM |
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> | |
8936dda4 | 26 | #include <linux/vmalloc.h> |
2c9097e4 | 27 | #include <linux/srcu.h> |
a2932923 PM |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
de56a948 PM |
30 | |
31 | #include <asm/tlbflush.h> | |
32 | #include <asm/kvm_ppc.h> | |
33 | #include <asm/kvm_book3s.h> | |
34 | #include <asm/mmu-hash64.h> | |
35 | #include <asm/hvcall.h> | |
36 | #include <asm/synch.h> | |
37 | #include <asm/ppc-opcode.h> | |
38 | #include <asm/cputable.h> | |
39 | ||
9e368f29 PM |
40 | /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ |
41 | #define MAX_LPID_970 63 | |
de56a948 | 42 | |
32fad281 PM |
43 | /* Power architecture requires HPT is at least 256kB */ |
44 | #define PPC_MIN_HPT_ORDER 18 | |
45 | ||
7ed661bf PM |
46 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
47 | long pte_index, unsigned long pteh, | |
48 | unsigned long ptel, unsigned long *pte_idx_ret); | |
a64fd707 | 49 | static void kvmppc_rmap_reset(struct kvm *kvm); |
7ed661bf | 50 | |
32fad281 | 51 | long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp) |
de56a948 PM |
52 | { |
53 | unsigned long hpt; | |
8936dda4 | 54 | struct revmap_entry *rev; |
d2a1b483 | 55 | struct kvmppc_linear_info *li; |
32fad281 | 56 | long order = kvm_hpt_order; |
de56a948 | 57 | |
32fad281 PM |
58 | if (htab_orderp) { |
59 | order = *htab_orderp; | |
60 | if (order < PPC_MIN_HPT_ORDER) | |
61 | order = PPC_MIN_HPT_ORDER; | |
62 | } | |
63 | ||
64 | /* | |
65 | * If the user wants a different size from default, | |
66 | * try first to allocate it from the kernel page allocator. | |
67 | */ | |
68 | hpt = 0; | |
69 | if (order != kvm_hpt_order) { | |
d2a1b483 | 70 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| |
32fad281 PM |
71 | __GFP_NOWARN, order - PAGE_SHIFT); |
72 | if (!hpt) | |
73 | --order; | |
d2a1b483 AG |
74 | } |
75 | ||
32fad281 | 76 | /* Next try to allocate from the preallocated pool */ |
de56a948 | 77 | if (!hpt) { |
32fad281 PM |
78 | li = kvm_alloc_hpt(); |
79 | if (li) { | |
80 | hpt = (ulong)li->base_virt; | |
81 | kvm->arch.hpt_li = li; | |
82 | order = kvm_hpt_order; | |
83 | } | |
de56a948 | 84 | } |
32fad281 PM |
85 | |
86 | /* Lastly try successively smaller sizes from the page allocator */ | |
87 | while (!hpt && order > PPC_MIN_HPT_ORDER) { | |
88 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| | |
89 | __GFP_NOWARN, order - PAGE_SHIFT); | |
90 | if (!hpt) | |
91 | --order; | |
92 | } | |
93 | ||
94 | if (!hpt) | |
95 | return -ENOMEM; | |
96 | ||
de56a948 | 97 | kvm->arch.hpt_virt = hpt; |
32fad281 PM |
98 | kvm->arch.hpt_order = order; |
99 | /* HPTEs are 2**4 bytes long */ | |
100 | kvm->arch.hpt_npte = 1ul << (order - 4); | |
101 | /* 128 (2**7) bytes in each HPTEG */ | |
102 | kvm->arch.hpt_mask = (1ul << (order - 7)) - 1; | |
de56a948 | 103 | |
8936dda4 | 104 | /* Allocate reverse map array */ |
32fad281 | 105 | rev = vmalloc(sizeof(struct revmap_entry) * kvm->arch.hpt_npte); |
8936dda4 PM |
106 | if (!rev) { |
107 | pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n"); | |
108 | goto out_freehpt; | |
109 | } | |
110 | kvm->arch.revmap = rev; | |
32fad281 | 111 | kvm->arch.sdr1 = __pa(hpt) | (order - 18); |
8936dda4 | 112 | |
32fad281 PM |
113 | pr_info("KVM guest htab at %lx (order %ld), LPID %x\n", |
114 | hpt, order, kvm->arch.lpid); | |
de56a948 | 115 | |
32fad281 PM |
116 | if (htab_orderp) |
117 | *htab_orderp = order; | |
de56a948 | 118 | return 0; |
8936dda4 | 119 | |
8936dda4 | 120 | out_freehpt: |
32fad281 PM |
121 | if (kvm->arch.hpt_li) |
122 | kvm_release_hpt(kvm->arch.hpt_li); | |
123 | else | |
124 | free_pages(hpt, order - PAGE_SHIFT); | |
8936dda4 | 125 | return -ENOMEM; |
de56a948 PM |
126 | } |
127 | ||
32fad281 PM |
128 | long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp) |
129 | { | |
130 | long err = -EBUSY; | |
131 | long order; | |
132 | ||
133 | mutex_lock(&kvm->lock); | |
134 | if (kvm->arch.rma_setup_done) { | |
135 | kvm->arch.rma_setup_done = 0; | |
136 | /* order rma_setup_done vs. vcpus_running */ | |
137 | smp_mb(); | |
138 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
139 | kvm->arch.rma_setup_done = 1; | |
140 | goto out; | |
141 | } | |
142 | } | |
143 | if (kvm->arch.hpt_virt) { | |
144 | order = kvm->arch.hpt_order; | |
145 | /* Set the entire HPT to 0, i.e. invalid HPTEs */ | |
146 | memset((void *)kvm->arch.hpt_virt, 0, 1ul << order); | |
a64fd707 PM |
147 | /* |
148 | * Reset all the reverse-mapping chains for all memslots | |
149 | */ | |
150 | kvmppc_rmap_reset(kvm); | |
1b400ba0 PM |
151 | /* Ensure that each vcpu will flush its TLB on next entry. */ |
152 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
32fad281 PM |
153 | *htab_orderp = order; |
154 | err = 0; | |
155 | } else { | |
156 | err = kvmppc_alloc_hpt(kvm, htab_orderp); | |
157 | order = *htab_orderp; | |
158 | } | |
159 | out: | |
160 | mutex_unlock(&kvm->lock); | |
161 | return err; | |
162 | } | |
163 | ||
de56a948 PM |
164 | void kvmppc_free_hpt(struct kvm *kvm) |
165 | { | |
043cc4d7 | 166 | kvmppc_free_lpid(kvm->arch.lpid); |
8936dda4 | 167 | vfree(kvm->arch.revmap); |
d2a1b483 AG |
168 | if (kvm->arch.hpt_li) |
169 | kvm_release_hpt(kvm->arch.hpt_li); | |
170 | else | |
32fad281 PM |
171 | free_pages(kvm->arch.hpt_virt, |
172 | kvm->arch.hpt_order - PAGE_SHIFT); | |
de56a948 PM |
173 | } |
174 | ||
da9d1d7f PM |
175 | /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ |
176 | static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize) | |
177 | { | |
178 | return (pgsize > 0x1000) ? HPTE_V_LARGE : 0; | |
179 | } | |
180 | ||
181 | /* Bits in second HPTE dword for pagesize 4k, 64k or 16M */ | |
182 | static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize) | |
183 | { | |
184 | return (pgsize == 0x10000) ? 0x1000 : 0; | |
185 | } | |
186 | ||
187 | void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, | |
188 | unsigned long porder) | |
de56a948 PM |
189 | { |
190 | unsigned long i; | |
b2b2f165 | 191 | unsigned long npages; |
c77162de PM |
192 | unsigned long hp_v, hp_r; |
193 | unsigned long addr, hash; | |
da9d1d7f PM |
194 | unsigned long psize; |
195 | unsigned long hp0, hp1; | |
7ed661bf | 196 | unsigned long idx_ret; |
c77162de | 197 | long ret; |
32fad281 | 198 | struct kvm *kvm = vcpu->kvm; |
de56a948 | 199 | |
da9d1d7f PM |
200 | psize = 1ul << porder; |
201 | npages = memslot->npages >> (porder - PAGE_SHIFT); | |
de56a948 PM |
202 | |
203 | /* VRMA can't be > 1TB */ | |
8936dda4 PM |
204 | if (npages > 1ul << (40 - porder)) |
205 | npages = 1ul << (40 - porder); | |
de56a948 | 206 | /* Can't use more than 1 HPTE per HPTEG */ |
32fad281 PM |
207 | if (npages > kvm->arch.hpt_mask + 1) |
208 | npages = kvm->arch.hpt_mask + 1; | |
de56a948 | 209 | |
da9d1d7f PM |
210 | hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | |
211 | HPTE_V_BOLTED | hpte0_pgsize_encoding(psize); | |
212 | hp1 = hpte1_pgsize_encoding(psize) | | |
213 | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; | |
214 | ||
de56a948 | 215 | for (i = 0; i < npages; ++i) { |
c77162de | 216 | addr = i << porder; |
de56a948 | 217 | /* can't use hpt_hash since va > 64 bits */ |
32fad281 | 218 | hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & kvm->arch.hpt_mask; |
de56a948 PM |
219 | /* |
220 | * We assume that the hash table is empty and no | |
221 | * vcpus are using it at this stage. Since we create | |
222 | * at most one HPTE per HPTEG, we just assume entry 7 | |
223 | * is available and use it. | |
224 | */ | |
8936dda4 | 225 | hash = (hash << 3) + 7; |
da9d1d7f PM |
226 | hp_v = hp0 | ((addr >> 16) & ~0x7fUL); |
227 | hp_r = hp1 | addr; | |
7ed661bf PM |
228 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, hash, hp_v, hp_r, |
229 | &idx_ret); | |
c77162de PM |
230 | if (ret != H_SUCCESS) { |
231 | pr_err("KVM: map_vrma at %lx failed, ret=%ld\n", | |
232 | addr, ret); | |
233 | break; | |
234 | } | |
de56a948 PM |
235 | } |
236 | } | |
237 | ||
238 | int kvmppc_mmu_hv_init(void) | |
239 | { | |
9e368f29 PM |
240 | unsigned long host_lpid, rsvd_lpid; |
241 | ||
242 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
de56a948 | 243 | return -EINVAL; |
9e368f29 | 244 | |
043cc4d7 | 245 | /* POWER7 has 10-bit LPIDs, PPC970 and e500mc have 6-bit LPIDs */ |
9e368f29 PM |
246 | if (cpu_has_feature(CPU_FTR_ARCH_206)) { |
247 | host_lpid = mfspr(SPRN_LPID); /* POWER7 */ | |
248 | rsvd_lpid = LPID_RSVD; | |
249 | } else { | |
250 | host_lpid = 0; /* PPC970 */ | |
251 | rsvd_lpid = MAX_LPID_970; | |
252 | } | |
253 | ||
043cc4d7 SW |
254 | kvmppc_init_lpid(rsvd_lpid + 1); |
255 | ||
256 | kvmppc_claim_lpid(host_lpid); | |
9e368f29 | 257 | /* rsvd_lpid is reserved for use in partition switching */ |
043cc4d7 | 258 | kvmppc_claim_lpid(rsvd_lpid); |
de56a948 PM |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
263 | void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) | |
264 | { | |
265 | } | |
266 | ||
267 | static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) | |
268 | { | |
269 | kvmppc_set_msr(vcpu, MSR_SF | MSR_ME); | |
270 | } | |
271 | ||
c77162de PM |
272 | /* |
273 | * This is called to get a reference to a guest page if there isn't | |
a66b48c3 | 274 | * one already in the memslot->arch.slot_phys[] array. |
c77162de PM |
275 | */ |
276 | static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, | |
da9d1d7f PM |
277 | struct kvm_memory_slot *memslot, |
278 | unsigned long psize) | |
c77162de PM |
279 | { |
280 | unsigned long start; | |
da9d1d7f PM |
281 | long np, err; |
282 | struct page *page, *hpage, *pages[1]; | |
283 | unsigned long s, pgsize; | |
c77162de | 284 | unsigned long *physp; |
9d0ef5ea PM |
285 | unsigned int is_io, got, pgorder; |
286 | struct vm_area_struct *vma; | |
da9d1d7f | 287 | unsigned long pfn, i, npages; |
c77162de | 288 | |
a66b48c3 | 289 | physp = memslot->arch.slot_phys; |
c77162de PM |
290 | if (!physp) |
291 | return -EINVAL; | |
da9d1d7f | 292 | if (physp[gfn - memslot->base_gfn]) |
c77162de PM |
293 | return 0; |
294 | ||
9d0ef5ea PM |
295 | is_io = 0; |
296 | got = 0; | |
c77162de | 297 | page = NULL; |
da9d1d7f | 298 | pgsize = psize; |
9d0ef5ea | 299 | err = -EINVAL; |
c77162de PM |
300 | start = gfn_to_hva_memslot(memslot, gfn); |
301 | ||
302 | /* Instantiate and get the page we want access to */ | |
303 | np = get_user_pages_fast(start, 1, 1, pages); | |
9d0ef5ea PM |
304 | if (np != 1) { |
305 | /* Look up the vma for the page */ | |
306 | down_read(¤t->mm->mmap_sem); | |
307 | vma = find_vma(current->mm, start); | |
308 | if (!vma || vma->vm_start > start || | |
309 | start + psize > vma->vm_end || | |
310 | !(vma->vm_flags & VM_PFNMAP)) | |
311 | goto up_err; | |
312 | is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); | |
313 | pfn = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); | |
314 | /* check alignment of pfn vs. requested page size */ | |
315 | if (psize > PAGE_SIZE && (pfn & ((psize >> PAGE_SHIFT) - 1))) | |
316 | goto up_err; | |
317 | up_read(¤t->mm->mmap_sem); | |
318 | ||
319 | } else { | |
320 | page = pages[0]; | |
321 | got = KVMPPC_GOT_PAGE; | |
322 | ||
323 | /* See if this is a large page */ | |
324 | s = PAGE_SIZE; | |
325 | if (PageHuge(page)) { | |
326 | hpage = compound_head(page); | |
327 | s <<= compound_order(hpage); | |
328 | /* Get the whole large page if slot alignment is ok */ | |
329 | if (s > psize && slot_is_aligned(memslot, s) && | |
330 | !(memslot->userspace_addr & (s - 1))) { | |
331 | start &= ~(s - 1); | |
332 | pgsize = s; | |
de6c0b02 DG |
333 | get_page(hpage); |
334 | put_page(page); | |
9d0ef5ea PM |
335 | page = hpage; |
336 | } | |
da9d1d7f | 337 | } |
9d0ef5ea PM |
338 | if (s < psize) |
339 | goto out; | |
340 | pfn = page_to_pfn(page); | |
c77162de | 341 | } |
c77162de | 342 | |
da9d1d7f PM |
343 | npages = pgsize >> PAGE_SHIFT; |
344 | pgorder = __ilog2(npages); | |
345 | physp += (gfn - memslot->base_gfn) & ~(npages - 1); | |
c77162de | 346 | spin_lock(&kvm->arch.slot_phys_lock); |
da9d1d7f PM |
347 | for (i = 0; i < npages; ++i) { |
348 | if (!physp[i]) { | |
9d0ef5ea PM |
349 | physp[i] = ((pfn + i) << PAGE_SHIFT) + |
350 | got + is_io + pgorder; | |
da9d1d7f PM |
351 | got = 0; |
352 | } | |
353 | } | |
c77162de | 354 | spin_unlock(&kvm->arch.slot_phys_lock); |
da9d1d7f | 355 | err = 0; |
c77162de | 356 | |
da9d1d7f | 357 | out: |
de6c0b02 | 358 | if (got) |
da9d1d7f | 359 | put_page(page); |
da9d1d7f | 360 | return err; |
9d0ef5ea PM |
361 | |
362 | up_err: | |
363 | up_read(¤t->mm->mmap_sem); | |
364 | return err; | |
c77162de PM |
365 | } |
366 | ||
7ed661bf PM |
367 | long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
368 | long pte_index, unsigned long pteh, | |
369 | unsigned long ptel, unsigned long *pte_idx_ret) | |
c77162de | 370 | { |
c77162de PM |
371 | unsigned long psize, gpa, gfn; |
372 | struct kvm_memory_slot *memslot; | |
373 | long ret; | |
374 | ||
342d3db7 PM |
375 | if (kvm->arch.using_mmu_notifiers) |
376 | goto do_insert; | |
377 | ||
c77162de PM |
378 | psize = hpte_page_size(pteh, ptel); |
379 | if (!psize) | |
380 | return H_PARAMETER; | |
381 | ||
697d3899 PM |
382 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
383 | ||
c77162de PM |
384 | /* Find the memslot (if any) for this address */ |
385 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); | |
386 | gfn = gpa >> PAGE_SHIFT; | |
387 | memslot = gfn_to_memslot(kvm, gfn); | |
697d3899 PM |
388 | if (memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)) { |
389 | if (!slot_is_aligned(memslot, psize)) | |
390 | return H_PARAMETER; | |
391 | if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0) | |
392 | return H_PARAMETER; | |
393 | } | |
c77162de | 394 | |
342d3db7 PM |
395 | do_insert: |
396 | /* Protect linux PTE lookup from page table destruction */ | |
397 | rcu_read_lock_sched(); /* this disables preemption too */ | |
7ed661bf PM |
398 | ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, |
399 | current->mm->pgd, false, pte_idx_ret); | |
342d3db7 | 400 | rcu_read_unlock_sched(); |
c77162de PM |
401 | if (ret == H_TOO_HARD) { |
402 | /* this can't happen */ | |
403 | pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); | |
404 | ret = H_RESOURCE; /* or something */ | |
405 | } | |
406 | return ret; | |
407 | ||
408 | } | |
409 | ||
7ed661bf PM |
410 | /* |
411 | * We come here on a H_ENTER call from the guest when we are not | |
412 | * using mmu notifiers and we don't have the requested page pinned | |
413 | * already. | |
414 | */ | |
415 | long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, | |
416 | long pte_index, unsigned long pteh, | |
417 | unsigned long ptel) | |
418 | { | |
419 | return kvmppc_virtmode_do_h_enter(vcpu->kvm, flags, pte_index, | |
420 | pteh, ptel, &vcpu->arch.gpr[4]); | |
421 | } | |
422 | ||
697d3899 PM |
423 | static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, |
424 | gva_t eaddr) | |
425 | { | |
426 | u64 mask; | |
427 | int i; | |
428 | ||
429 | for (i = 0; i < vcpu->arch.slb_nr; i++) { | |
430 | if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) | |
431 | continue; | |
432 | ||
433 | if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) | |
434 | mask = ESID_MASK_1T; | |
435 | else | |
436 | mask = ESID_MASK; | |
437 | ||
438 | if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) | |
439 | return &vcpu->arch.slb[i]; | |
440 | } | |
441 | return NULL; | |
442 | } | |
443 | ||
444 | static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, | |
445 | unsigned long ea) | |
446 | { | |
447 | unsigned long ra_mask; | |
448 | ||
449 | ra_mask = hpte_page_size(v, r) - 1; | |
450 | return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); | |
451 | } | |
452 | ||
de56a948 | 453 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
697d3899 | 454 | struct kvmppc_pte *gpte, bool data) |
de56a948 | 455 | { |
697d3899 PM |
456 | struct kvm *kvm = vcpu->kvm; |
457 | struct kvmppc_slb *slbe; | |
458 | unsigned long slb_v; | |
459 | unsigned long pp, key; | |
460 | unsigned long v, gr; | |
461 | unsigned long *hptep; | |
462 | int index; | |
463 | int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); | |
464 | ||
465 | /* Get SLB entry */ | |
466 | if (virtmode) { | |
467 | slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); | |
468 | if (!slbe) | |
469 | return -EINVAL; | |
470 | slb_v = slbe->origv; | |
471 | } else { | |
472 | /* real mode access */ | |
473 | slb_v = vcpu->kvm->arch.vrma_slb_v; | |
474 | } | |
475 | ||
476 | /* Find the HPTE in the hash table */ | |
477 | index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, | |
478 | HPTE_V_VALID | HPTE_V_ABSENT); | |
479 | if (index < 0) | |
480 | return -ENOENT; | |
481 | hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); | |
482 | v = hptep[0] & ~HPTE_V_HVLOCK; | |
483 | gr = kvm->arch.revmap[index].guest_rpte; | |
484 | ||
485 | /* Unlock the HPTE */ | |
486 | asm volatile("lwsync" : : : "memory"); | |
487 | hptep[0] = v; | |
488 | ||
489 | gpte->eaddr = eaddr; | |
490 | gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); | |
491 | ||
492 | /* Get PP bits and key for permission check */ | |
493 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
494 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
495 | key &= slb_v; | |
496 | ||
497 | /* Calculate permissions */ | |
498 | gpte->may_read = hpte_read_permission(pp, key); | |
499 | gpte->may_write = hpte_write_permission(pp, key); | |
500 | gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); | |
501 | ||
502 | /* Storage key permission check for POWER7 */ | |
503 | if (data && virtmode && cpu_has_feature(CPU_FTR_ARCH_206)) { | |
504 | int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); | |
505 | if (amrfield & 1) | |
506 | gpte->may_read = 0; | |
507 | if (amrfield & 2) | |
508 | gpte->may_write = 0; | |
509 | } | |
510 | ||
511 | /* Get the guest physical address */ | |
512 | gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Quick test for whether an instruction is a load or a store. | |
518 | * If the instruction is a load or a store, then this will indicate | |
519 | * which it is, at least on server processors. (Embedded processors | |
520 | * have some external PID instructions that don't follow the rule | |
521 | * embodied here.) If the instruction isn't a load or store, then | |
522 | * this doesn't return anything useful. | |
523 | */ | |
524 | static int instruction_is_store(unsigned int instr) | |
525 | { | |
526 | unsigned int mask; | |
527 | ||
528 | mask = 0x10000000; | |
529 | if ((instr & 0xfc000000) == 0x7c000000) | |
530 | mask = 0x100; /* major opcode 31 */ | |
531 | return (instr & mask) != 0; | |
532 | } | |
533 | ||
534 | static int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
6020c0f6 | 535 | unsigned long gpa, gva_t ea, int is_store) |
697d3899 PM |
536 | { |
537 | int ret; | |
538 | u32 last_inst; | |
539 | unsigned long srr0 = kvmppc_get_pc(vcpu); | |
540 | ||
541 | /* We try to load the last instruction. We don't let | |
542 | * emulate_instruction do it as it doesn't check what | |
543 | * kvmppc_ld returns. | |
544 | * If we fail, we just return to the guest and try executing it again. | |
545 | */ | |
546 | if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) { | |
547 | ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); | |
548 | if (ret != EMULATE_DONE || last_inst == KVM_INST_FETCH_FAILED) | |
549 | return RESUME_GUEST; | |
550 | vcpu->arch.last_inst = last_inst; | |
551 | } | |
552 | ||
553 | /* | |
554 | * WARNING: We do not know for sure whether the instruction we just | |
555 | * read from memory is the same that caused the fault in the first | |
556 | * place. If the instruction we read is neither an load or a store, | |
557 | * then it can't access memory, so we don't need to worry about | |
558 | * enforcing access permissions. So, assuming it is a load or | |
559 | * store, we just check that its direction (load or store) is | |
560 | * consistent with the original fault, since that's what we | |
561 | * checked the access permissions against. If there is a mismatch | |
562 | * we just return and retry the instruction. | |
563 | */ | |
564 | ||
565 | if (instruction_is_store(vcpu->arch.last_inst) != !!is_store) | |
566 | return RESUME_GUEST; | |
567 | ||
568 | /* | |
569 | * Emulated accesses are emulated by looking at the hash for | |
570 | * translation once, then performing the access later. The | |
571 | * translation could be invalidated in the meantime in which | |
572 | * point performing the subsequent memory access on the old | |
573 | * physical address could possibly be a security hole for the | |
574 | * guest (but not the host). | |
575 | * | |
576 | * This is less of an issue for MMIO stores since they aren't | |
577 | * globally visible. It could be an issue for MMIO loads to | |
578 | * a certain extent but we'll ignore it for now. | |
579 | */ | |
580 | ||
581 | vcpu->arch.paddr_accessed = gpa; | |
6020c0f6 | 582 | vcpu->arch.vaddr_accessed = ea; |
697d3899 PM |
583 | return kvmppc_emulate_mmio(run, vcpu); |
584 | } | |
585 | ||
586 | int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
587 | unsigned long ea, unsigned long dsisr) | |
588 | { | |
589 | struct kvm *kvm = vcpu->kvm; | |
342d3db7 PM |
590 | unsigned long *hptep, hpte[3], r; |
591 | unsigned long mmu_seq, psize, pte_size; | |
70bddfef | 592 | unsigned long gpa, gfn, hva, pfn; |
697d3899 | 593 | struct kvm_memory_slot *memslot; |
342d3db7 | 594 | unsigned long *rmap; |
697d3899 | 595 | struct revmap_entry *rev; |
342d3db7 PM |
596 | struct page *page, *pages[1]; |
597 | long index, ret, npages; | |
598 | unsigned long is_io; | |
4cf302bc | 599 | unsigned int writing, write_ok; |
342d3db7 | 600 | struct vm_area_struct *vma; |
bad3b507 | 601 | unsigned long rcbits; |
697d3899 PM |
602 | |
603 | /* | |
604 | * Real-mode code has already searched the HPT and found the | |
605 | * entry we're interested in. Lock the entry and check that | |
606 | * it hasn't changed. If it has, just return and re-execute the | |
607 | * instruction. | |
608 | */ | |
609 | if (ea != vcpu->arch.pgfault_addr) | |
610 | return RESUME_GUEST; | |
611 | index = vcpu->arch.pgfault_index; | |
612 | hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); | |
613 | rev = &kvm->arch.revmap[index]; | |
614 | preempt_disable(); | |
615 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
616 | cpu_relax(); | |
617 | hpte[0] = hptep[0] & ~HPTE_V_HVLOCK; | |
618 | hpte[1] = hptep[1]; | |
342d3db7 | 619 | hpte[2] = r = rev->guest_rpte; |
697d3899 PM |
620 | asm volatile("lwsync" : : : "memory"); |
621 | hptep[0] = hpte[0]; | |
622 | preempt_enable(); | |
623 | ||
624 | if (hpte[0] != vcpu->arch.pgfault_hpte[0] || | |
625 | hpte[1] != vcpu->arch.pgfault_hpte[1]) | |
626 | return RESUME_GUEST; | |
627 | ||
628 | /* Translate the logical address and get the page */ | |
342d3db7 | 629 | psize = hpte_page_size(hpte[0], r); |
70bddfef PM |
630 | gpa = (r & HPTE_R_RPN & ~(psize - 1)) | (ea & (psize - 1)); |
631 | gfn = gpa >> PAGE_SHIFT; | |
697d3899 PM |
632 | memslot = gfn_to_memslot(kvm, gfn); |
633 | ||
634 | /* No memslot means it's an emulated MMIO region */ | |
70bddfef | 635 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
6020c0f6 | 636 | return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, |
697d3899 | 637 | dsisr & DSISR_ISSTORE); |
697d3899 | 638 | |
342d3db7 PM |
639 | if (!kvm->arch.using_mmu_notifiers) |
640 | return -EFAULT; /* should never get here */ | |
641 | ||
642 | /* used to check for invalidations in progress */ | |
643 | mmu_seq = kvm->mmu_notifier_seq; | |
644 | smp_rmb(); | |
645 | ||
646 | is_io = 0; | |
647 | pfn = 0; | |
648 | page = NULL; | |
649 | pte_size = PAGE_SIZE; | |
4cf302bc PM |
650 | writing = (dsisr & DSISR_ISSTORE) != 0; |
651 | /* If writing != 0, then the HPTE must allow writing, if we get here */ | |
652 | write_ok = writing; | |
342d3db7 | 653 | hva = gfn_to_hva_memslot(memslot, gfn); |
4cf302bc | 654 | npages = get_user_pages_fast(hva, 1, writing, pages); |
342d3db7 PM |
655 | if (npages < 1) { |
656 | /* Check if it's an I/O mapping */ | |
657 | down_read(¤t->mm->mmap_sem); | |
658 | vma = find_vma(current->mm, hva); | |
659 | if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end && | |
660 | (vma->vm_flags & VM_PFNMAP)) { | |
661 | pfn = vma->vm_pgoff + | |
662 | ((hva - vma->vm_start) >> PAGE_SHIFT); | |
663 | pte_size = psize; | |
664 | is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); | |
4cf302bc | 665 | write_ok = vma->vm_flags & VM_WRITE; |
342d3db7 PM |
666 | } |
667 | up_read(¤t->mm->mmap_sem); | |
668 | if (!pfn) | |
669 | return -EFAULT; | |
670 | } else { | |
671 | page = pages[0]; | |
672 | if (PageHuge(page)) { | |
673 | page = compound_head(page); | |
674 | pte_size <<= compound_order(page); | |
675 | } | |
4cf302bc PM |
676 | /* if the guest wants write access, see if that is OK */ |
677 | if (!writing && hpte_is_writable(r)) { | |
db7cb5b9 | 678 | unsigned int hugepage_shift; |
4cf302bc PM |
679 | pte_t *ptep, pte; |
680 | ||
681 | /* | |
682 | * We need to protect against page table destruction | |
683 | * while looking up and updating the pte. | |
684 | */ | |
685 | rcu_read_lock_sched(); | |
686 | ptep = find_linux_pte_or_hugepte(current->mm->pgd, | |
db7cb5b9 AK |
687 | hva, &hugepage_shift); |
688 | if (ptep) { | |
689 | pte = kvmppc_read_update_linux_pte(ptep, 1, | |
690 | hugepage_shift); | |
4cf302bc PM |
691 | if (pte_write(pte)) |
692 | write_ok = 1; | |
693 | } | |
694 | rcu_read_unlock_sched(); | |
695 | } | |
342d3db7 PM |
696 | pfn = page_to_pfn(page); |
697 | } | |
698 | ||
699 | ret = -EFAULT; | |
700 | if (psize > pte_size) | |
701 | goto out_put; | |
702 | ||
703 | /* Check WIMG vs. the actual page we're accessing */ | |
704 | if (!hpte_cache_flags_ok(r, is_io)) { | |
705 | if (is_io) | |
706 | return -EFAULT; | |
707 | /* | |
708 | * Allow guest to map emulated device memory as | |
709 | * uncacheable, but actually make it cacheable. | |
710 | */ | |
711 | r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; | |
712 | } | |
713 | ||
714 | /* Set the HPTE to point to pfn */ | |
715 | r = (r & ~(HPTE_R_PP0 - pte_size)) | (pfn << PAGE_SHIFT); | |
4cf302bc PM |
716 | if (hpte_is_writable(r) && !write_ok) |
717 | r = hpte_make_readonly(r); | |
342d3db7 PM |
718 | ret = RESUME_GUEST; |
719 | preempt_disable(); | |
720 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
721 | cpu_relax(); | |
722 | if ((hptep[0] & ~HPTE_V_HVLOCK) != hpte[0] || hptep[1] != hpte[1] || | |
723 | rev->guest_rpte != hpte[2]) | |
724 | /* HPTE has been changed under us; let the guest retry */ | |
725 | goto out_unlock; | |
726 | hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
727 | ||
d89cc617 | 728 | rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
342d3db7 PM |
729 | lock_rmap(rmap); |
730 | ||
731 | /* Check if we might have been invalidated; let the guest retry if so */ | |
732 | ret = RESUME_GUEST; | |
8ca40a70 | 733 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) { |
342d3db7 PM |
734 | unlock_rmap(rmap); |
735 | goto out_unlock; | |
736 | } | |
4cf302bc | 737 | |
bad3b507 PM |
738 | /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ |
739 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
740 | r &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
741 | ||
4cf302bc PM |
742 | if (hptep[0] & HPTE_V_VALID) { |
743 | /* HPTE was previously valid, so we need to invalidate it */ | |
744 | unlock_rmap(rmap); | |
745 | hptep[0] |= HPTE_V_ABSENT; | |
746 | kvmppc_invalidate_hpte(kvm, hptep, index); | |
bad3b507 PM |
747 | /* don't lose previous R and C bits */ |
748 | r |= hptep[1] & (HPTE_R_R | HPTE_R_C); | |
4cf302bc PM |
749 | } else { |
750 | kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); | |
751 | } | |
342d3db7 PM |
752 | |
753 | hptep[1] = r; | |
754 | eieio(); | |
755 | hptep[0] = hpte[0]; | |
756 | asm volatile("ptesync" : : : "memory"); | |
757 | preempt_enable(); | |
4cf302bc | 758 | if (page && hpte_is_writable(r)) |
342d3db7 PM |
759 | SetPageDirty(page); |
760 | ||
761 | out_put: | |
de6c0b02 DG |
762 | if (page) { |
763 | /* | |
764 | * We drop pages[0] here, not page because page might | |
765 | * have been set to the head page of a compound, but | |
766 | * we have to drop the reference on the correct tail | |
767 | * page to match the get inside gup() | |
768 | */ | |
769 | put_page(pages[0]); | |
770 | } | |
342d3db7 PM |
771 | return ret; |
772 | ||
773 | out_unlock: | |
774 | hptep[0] &= ~HPTE_V_HVLOCK; | |
775 | preempt_enable(); | |
776 | goto out_put; | |
777 | } | |
778 | ||
a64fd707 PM |
779 | static void kvmppc_rmap_reset(struct kvm *kvm) |
780 | { | |
781 | struct kvm_memslots *slots; | |
782 | struct kvm_memory_slot *memslot; | |
783 | int srcu_idx; | |
784 | ||
785 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
786 | slots = kvm->memslots; | |
787 | kvm_for_each_memslot(memslot, slots) { | |
788 | /* | |
789 | * This assumes it is acceptable to lose reference and | |
790 | * change bits across a reset. | |
791 | */ | |
792 | memset(memslot->arch.rmap, 0, | |
793 | memslot->npages * sizeof(*memslot->arch.rmap)); | |
794 | } | |
795 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
796 | } | |
797 | ||
84504ef3 TY |
798 | static int kvm_handle_hva_range(struct kvm *kvm, |
799 | unsigned long start, | |
800 | unsigned long end, | |
801 | int (*handler)(struct kvm *kvm, | |
802 | unsigned long *rmapp, | |
803 | unsigned long gfn)) | |
342d3db7 PM |
804 | { |
805 | int ret; | |
806 | int retval = 0; | |
807 | struct kvm_memslots *slots; | |
808 | struct kvm_memory_slot *memslot; | |
809 | ||
810 | slots = kvm_memslots(kvm); | |
811 | kvm_for_each_memslot(memslot, slots) { | |
84504ef3 TY |
812 | unsigned long hva_start, hva_end; |
813 | gfn_t gfn, gfn_end; | |
814 | ||
815 | hva_start = max(start, memslot->userspace_addr); | |
816 | hva_end = min(end, memslot->userspace_addr + | |
817 | (memslot->npages << PAGE_SHIFT)); | |
818 | if (hva_start >= hva_end) | |
819 | continue; | |
820 | /* | |
821 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
822 | * {gfn, gfn+1, ..., gfn_end-1}. | |
823 | */ | |
824 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
825 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
342d3db7 | 826 | |
84504ef3 | 827 | for (; gfn < gfn_end; ++gfn) { |
d19a748b | 828 | gfn_t gfn_offset = gfn - memslot->base_gfn; |
342d3db7 | 829 | |
d89cc617 | 830 | ret = handler(kvm, &memslot->arch.rmap[gfn_offset], gfn); |
342d3db7 PM |
831 | retval |= ret; |
832 | } | |
833 | } | |
834 | ||
835 | return retval; | |
836 | } | |
837 | ||
84504ef3 TY |
838 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
839 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, | |
840 | unsigned long gfn)) | |
841 | { | |
842 | return kvm_handle_hva_range(kvm, hva, hva + 1, handler); | |
843 | } | |
844 | ||
342d3db7 PM |
845 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
846 | unsigned long gfn) | |
847 | { | |
848 | struct revmap_entry *rev = kvm->arch.revmap; | |
849 | unsigned long h, i, j; | |
850 | unsigned long *hptep; | |
bad3b507 | 851 | unsigned long ptel, psize, rcbits; |
342d3db7 PM |
852 | |
853 | for (;;) { | |
bad3b507 | 854 | lock_rmap(rmapp); |
342d3db7 | 855 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
bad3b507 | 856 | unlock_rmap(rmapp); |
342d3db7 PM |
857 | break; |
858 | } | |
859 | ||
860 | /* | |
861 | * To avoid an ABBA deadlock with the HPTE lock bit, | |
bad3b507 PM |
862 | * we can't spin on the HPTE lock while holding the |
863 | * rmap chain lock. | |
342d3db7 PM |
864 | */ |
865 | i = *rmapp & KVMPPC_RMAP_INDEX; | |
bad3b507 PM |
866 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); |
867 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
868 | /* unlock rmap before spinning on the HPTE lock */ | |
869 | unlock_rmap(rmapp); | |
870 | while (hptep[0] & HPTE_V_HVLOCK) | |
871 | cpu_relax(); | |
872 | continue; | |
873 | } | |
342d3db7 PM |
874 | j = rev[i].forw; |
875 | if (j == i) { | |
876 | /* chain is now empty */ | |
bad3b507 | 877 | *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); |
342d3db7 PM |
878 | } else { |
879 | /* remove i from chain */ | |
880 | h = rev[i].back; | |
881 | rev[h].forw = j; | |
882 | rev[j].back = h; | |
883 | rev[i].forw = rev[i].back = i; | |
bad3b507 | 884 | *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; |
342d3db7 | 885 | } |
342d3db7 | 886 | |
bad3b507 | 887 | /* Now check and modify the HPTE */ |
342d3db7 PM |
888 | ptel = rev[i].guest_rpte; |
889 | psize = hpte_page_size(hptep[0], ptel); | |
890 | if ((hptep[0] & HPTE_V_VALID) && | |
891 | hpte_rpn(ptel, psize) == gfn) { | |
dfe49dbd PM |
892 | if (kvm->arch.using_mmu_notifiers) |
893 | hptep[0] |= HPTE_V_ABSENT; | |
bad3b507 PM |
894 | kvmppc_invalidate_hpte(kvm, hptep, i); |
895 | /* Harvest R and C */ | |
896 | rcbits = hptep[1] & (HPTE_R_R | HPTE_R_C); | |
897 | *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; | |
a1b4a0f6 PM |
898 | if (rcbits & ~rev[i].guest_rpte) { |
899 | rev[i].guest_rpte = ptel | rcbits; | |
900 | note_hpte_modification(kvm, &rev[i]); | |
901 | } | |
342d3db7 | 902 | } |
bad3b507 | 903 | unlock_rmap(rmapp); |
342d3db7 PM |
904 | hptep[0] &= ~HPTE_V_HVLOCK; |
905 | } | |
906 | return 0; | |
907 | } | |
908 | ||
909 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
910 | { | |
911 | if (kvm->arch.using_mmu_notifiers) | |
912 | kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); | |
913 | return 0; | |
914 | } | |
915 | ||
b3ae2096 TY |
916 | int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) |
917 | { | |
918 | if (kvm->arch.using_mmu_notifiers) | |
919 | kvm_handle_hva_range(kvm, start, end, kvm_unmap_rmapp); | |
920 | return 0; | |
921 | } | |
922 | ||
dfe49dbd PM |
923 | void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot) |
924 | { | |
925 | unsigned long *rmapp; | |
926 | unsigned long gfn; | |
927 | unsigned long n; | |
928 | ||
929 | rmapp = memslot->arch.rmap; | |
930 | gfn = memslot->base_gfn; | |
931 | for (n = memslot->npages; n; --n) { | |
932 | /* | |
933 | * Testing the present bit without locking is OK because | |
934 | * the memslot has been marked invalid already, and hence | |
935 | * no new HPTEs referencing this page can be created, | |
936 | * thus the present bit can't go from 0 to 1. | |
937 | */ | |
938 | if (*rmapp & KVMPPC_RMAP_PRESENT) | |
939 | kvm_unmap_rmapp(kvm, rmapp, gfn); | |
940 | ++rmapp; | |
941 | ++gfn; | |
942 | } | |
943 | } | |
944 | ||
342d3db7 PM |
945 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
946 | unsigned long gfn) | |
947 | { | |
55514893 PM |
948 | struct revmap_entry *rev = kvm->arch.revmap; |
949 | unsigned long head, i, j; | |
950 | unsigned long *hptep; | |
951 | int ret = 0; | |
952 | ||
953 | retry: | |
954 | lock_rmap(rmapp); | |
955 | if (*rmapp & KVMPPC_RMAP_REFERENCED) { | |
956 | *rmapp &= ~KVMPPC_RMAP_REFERENCED; | |
957 | ret = 1; | |
958 | } | |
959 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
960 | unlock_rmap(rmapp); | |
961 | return ret; | |
962 | } | |
963 | ||
964 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
965 | do { | |
966 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); | |
967 | j = rev[i].forw; | |
968 | ||
969 | /* If this HPTE isn't referenced, ignore it */ | |
970 | if (!(hptep[1] & HPTE_R_R)) | |
971 | continue; | |
972 | ||
973 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
974 | /* unlock rmap before spinning on the HPTE lock */ | |
975 | unlock_rmap(rmapp); | |
976 | while (hptep[0] & HPTE_V_HVLOCK) | |
977 | cpu_relax(); | |
978 | goto retry; | |
979 | } | |
980 | ||
981 | /* Now check and modify the HPTE */ | |
982 | if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_R)) { | |
983 | kvmppc_clear_ref_hpte(kvm, hptep, i); | |
a1b4a0f6 PM |
984 | if (!(rev[i].guest_rpte & HPTE_R_R)) { |
985 | rev[i].guest_rpte |= HPTE_R_R; | |
986 | note_hpte_modification(kvm, &rev[i]); | |
987 | } | |
55514893 PM |
988 | ret = 1; |
989 | } | |
990 | hptep[0] &= ~HPTE_V_HVLOCK; | |
991 | } while ((i = j) != head); | |
992 | ||
993 | unlock_rmap(rmapp); | |
994 | return ret; | |
342d3db7 PM |
995 | } |
996 | ||
997 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) | |
998 | { | |
999 | if (!kvm->arch.using_mmu_notifiers) | |
1000 | return 0; | |
1001 | return kvm_handle_hva(kvm, hva, kvm_age_rmapp); | |
1002 | } | |
1003 | ||
1004 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, | |
1005 | unsigned long gfn) | |
1006 | { | |
55514893 PM |
1007 | struct revmap_entry *rev = kvm->arch.revmap; |
1008 | unsigned long head, i, j; | |
1009 | unsigned long *hp; | |
1010 | int ret = 1; | |
1011 | ||
1012 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
1013 | return 1; | |
1014 | ||
1015 | lock_rmap(rmapp); | |
1016 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
1017 | goto out; | |
1018 | ||
1019 | if (*rmapp & KVMPPC_RMAP_PRESENT) { | |
1020 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1021 | do { | |
1022 | hp = (unsigned long *)(kvm->arch.hpt_virt + (i << 4)); | |
1023 | j = rev[i].forw; | |
1024 | if (hp[1] & HPTE_R_R) | |
1025 | goto out; | |
1026 | } while ((i = j) != head); | |
1027 | } | |
1028 | ret = 0; | |
1029 | ||
1030 | out: | |
1031 | unlock_rmap(rmapp); | |
1032 | return ret; | |
342d3db7 PM |
1033 | } |
1034 | ||
1035 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) | |
1036 | { | |
1037 | if (!kvm->arch.using_mmu_notifiers) | |
1038 | return 0; | |
1039 | return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp); | |
1040 | } | |
1041 | ||
1042 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
1043 | { | |
1044 | if (!kvm->arch.using_mmu_notifiers) | |
1045 | return; | |
1046 | kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); | |
de56a948 PM |
1047 | } |
1048 | ||
82ed3616 PM |
1049 | static int kvm_test_clear_dirty(struct kvm *kvm, unsigned long *rmapp) |
1050 | { | |
1051 | struct revmap_entry *rev = kvm->arch.revmap; | |
1052 | unsigned long head, i, j; | |
1053 | unsigned long *hptep; | |
1054 | int ret = 0; | |
1055 | ||
1056 | retry: | |
1057 | lock_rmap(rmapp); | |
1058 | if (*rmapp & KVMPPC_RMAP_CHANGED) { | |
1059 | *rmapp &= ~KVMPPC_RMAP_CHANGED; | |
1060 | ret = 1; | |
1061 | } | |
1062 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
1063 | unlock_rmap(rmapp); | |
1064 | return ret; | |
1065 | } | |
1066 | ||
1067 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1068 | do { | |
1069 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); | |
1070 | j = rev[i].forw; | |
1071 | ||
1072 | if (!(hptep[1] & HPTE_R_C)) | |
1073 | continue; | |
1074 | ||
1075 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
1076 | /* unlock rmap before spinning on the HPTE lock */ | |
1077 | unlock_rmap(rmapp); | |
1078 | while (hptep[0] & HPTE_V_HVLOCK) | |
1079 | cpu_relax(); | |
1080 | goto retry; | |
1081 | } | |
1082 | ||
1083 | /* Now check and modify the HPTE */ | |
1084 | if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_C)) { | |
1085 | /* need to make it temporarily absent to clear C */ | |
1086 | hptep[0] |= HPTE_V_ABSENT; | |
1087 | kvmppc_invalidate_hpte(kvm, hptep, i); | |
1088 | hptep[1] &= ~HPTE_R_C; | |
1089 | eieio(); | |
1090 | hptep[0] = (hptep[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
a1b4a0f6 PM |
1091 | if (!(rev[i].guest_rpte & HPTE_R_C)) { |
1092 | rev[i].guest_rpte |= HPTE_R_C; | |
1093 | note_hpte_modification(kvm, &rev[i]); | |
1094 | } | |
82ed3616 PM |
1095 | ret = 1; |
1096 | } | |
1097 | hptep[0] &= ~HPTE_V_HVLOCK; | |
1098 | } while ((i = j) != head); | |
1099 | ||
1100 | unlock_rmap(rmapp); | |
1101 | return ret; | |
1102 | } | |
1103 | ||
c35635ef PM |
1104 | static void harvest_vpa_dirty(struct kvmppc_vpa *vpa, |
1105 | struct kvm_memory_slot *memslot, | |
1106 | unsigned long *map) | |
1107 | { | |
1108 | unsigned long gfn; | |
1109 | ||
1110 | if (!vpa->dirty || !vpa->pinned_addr) | |
1111 | return; | |
1112 | gfn = vpa->gpa >> PAGE_SHIFT; | |
1113 | if (gfn < memslot->base_gfn || | |
1114 | gfn >= memslot->base_gfn + memslot->npages) | |
1115 | return; | |
1116 | ||
1117 | vpa->dirty = false; | |
1118 | if (map) | |
1119 | __set_bit_le(gfn - memslot->base_gfn, map); | |
1120 | } | |
1121 | ||
dfe49dbd PM |
1122 | long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1123 | unsigned long *map) | |
82ed3616 PM |
1124 | { |
1125 | unsigned long i; | |
dfe49dbd | 1126 | unsigned long *rmapp; |
c35635ef | 1127 | struct kvm_vcpu *vcpu; |
82ed3616 PM |
1128 | |
1129 | preempt_disable(); | |
d89cc617 | 1130 | rmapp = memslot->arch.rmap; |
82ed3616 | 1131 | for (i = 0; i < memslot->npages; ++i) { |
dfe49dbd | 1132 | if (kvm_test_clear_dirty(kvm, rmapp) && map) |
82ed3616 PM |
1133 | __set_bit_le(i, map); |
1134 | ++rmapp; | |
1135 | } | |
c35635ef PM |
1136 | |
1137 | /* Harvest dirty bits from VPA and DTL updates */ | |
1138 | /* Note: we never modify the SLB shadow buffer areas */ | |
1139 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1140 | spin_lock(&vcpu->arch.vpa_update_lock); | |
1141 | harvest_vpa_dirty(&vcpu->arch.vpa, memslot, map); | |
1142 | harvest_vpa_dirty(&vcpu->arch.dtl, memslot, map); | |
1143 | spin_unlock(&vcpu->arch.vpa_update_lock); | |
1144 | } | |
82ed3616 PM |
1145 | preempt_enable(); |
1146 | return 0; | |
1147 | } | |
1148 | ||
93e60249 PM |
1149 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
1150 | unsigned long *nb_ret) | |
1151 | { | |
1152 | struct kvm_memory_slot *memslot; | |
1153 | unsigned long gfn = gpa >> PAGE_SHIFT; | |
342d3db7 PM |
1154 | struct page *page, *pages[1]; |
1155 | int npages; | |
c35635ef | 1156 | unsigned long hva, offset; |
da9d1d7f | 1157 | unsigned long pa; |
93e60249 | 1158 | unsigned long *physp; |
2c9097e4 | 1159 | int srcu_idx; |
93e60249 | 1160 | |
2c9097e4 | 1161 | srcu_idx = srcu_read_lock(&kvm->srcu); |
93e60249 PM |
1162 | memslot = gfn_to_memslot(kvm, gfn); |
1163 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) | |
2c9097e4 | 1164 | goto err; |
342d3db7 | 1165 | if (!kvm->arch.using_mmu_notifiers) { |
a66b48c3 | 1166 | physp = memslot->arch.slot_phys; |
342d3db7 | 1167 | if (!physp) |
2c9097e4 | 1168 | goto err; |
342d3db7 | 1169 | physp += gfn - memslot->base_gfn; |
c77162de | 1170 | pa = *physp; |
342d3db7 PM |
1171 | if (!pa) { |
1172 | if (kvmppc_get_guest_page(kvm, gfn, memslot, | |
1173 | PAGE_SIZE) < 0) | |
2c9097e4 | 1174 | goto err; |
342d3db7 PM |
1175 | pa = *physp; |
1176 | } | |
1177 | page = pfn_to_page(pa >> PAGE_SHIFT); | |
de6c0b02 | 1178 | get_page(page); |
342d3db7 PM |
1179 | } else { |
1180 | hva = gfn_to_hva_memslot(memslot, gfn); | |
1181 | npages = get_user_pages_fast(hva, 1, 1, pages); | |
1182 | if (npages < 1) | |
2c9097e4 | 1183 | goto err; |
342d3db7 | 1184 | page = pages[0]; |
c77162de | 1185 | } |
2c9097e4 PM |
1186 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
1187 | ||
c35635ef | 1188 | offset = gpa & (PAGE_SIZE - 1); |
93e60249 | 1189 | if (nb_ret) |
c35635ef | 1190 | *nb_ret = PAGE_SIZE - offset; |
93e60249 | 1191 | return page_address(page) + offset; |
2c9097e4 PM |
1192 | |
1193 | err: | |
1194 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1195 | return NULL; | |
93e60249 PM |
1196 | } |
1197 | ||
c35635ef PM |
1198 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, |
1199 | bool dirty) | |
93e60249 PM |
1200 | { |
1201 | struct page *page = virt_to_page(va); | |
c35635ef PM |
1202 | struct kvm_memory_slot *memslot; |
1203 | unsigned long gfn; | |
1204 | unsigned long *rmap; | |
1205 | int srcu_idx; | |
93e60249 | 1206 | |
93e60249 | 1207 | put_page(page); |
c35635ef PM |
1208 | |
1209 | if (!dirty || !kvm->arch.using_mmu_notifiers) | |
1210 | return; | |
1211 | ||
1212 | /* We need to mark this page dirty in the rmap chain */ | |
1213 | gfn = gpa >> PAGE_SHIFT; | |
1214 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
1215 | memslot = gfn_to_memslot(kvm, gfn); | |
1216 | if (memslot) { | |
1217 | rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1218 | lock_rmap(rmap); | |
1219 | *rmap |= KVMPPC_RMAP_CHANGED; | |
1220 | unlock_rmap(rmap); | |
1221 | } | |
1222 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
93e60249 PM |
1223 | } |
1224 | ||
a2932923 PM |
1225 | /* |
1226 | * Functions for reading and writing the hash table via reads and | |
1227 | * writes on a file descriptor. | |
1228 | * | |
1229 | * Reads return the guest view of the hash table, which has to be | |
1230 | * pieced together from the real hash table and the guest_rpte | |
1231 | * values in the revmap array. | |
1232 | * | |
1233 | * On writes, each HPTE written is considered in turn, and if it | |
1234 | * is valid, it is written to the HPT as if an H_ENTER with the | |
1235 | * exact flag set was done. When the invalid count is non-zero | |
1236 | * in the header written to the stream, the kernel will make | |
1237 | * sure that that many HPTEs are invalid, and invalidate them | |
1238 | * if not. | |
1239 | */ | |
1240 | ||
1241 | struct kvm_htab_ctx { | |
1242 | unsigned long index; | |
1243 | unsigned long flags; | |
1244 | struct kvm *kvm; | |
1245 | int first_pass; | |
1246 | }; | |
1247 | ||
1248 | #define HPTE_SIZE (2 * sizeof(unsigned long)) | |
1249 | ||
a1b4a0f6 PM |
1250 | /* |
1251 | * Returns 1 if this HPT entry has been modified or has pending | |
1252 | * R/C bit changes. | |
1253 | */ | |
1254 | static int hpte_dirty(struct revmap_entry *revp, unsigned long *hptp) | |
1255 | { | |
1256 | unsigned long rcbits_unset; | |
1257 | ||
1258 | if (revp->guest_rpte & HPTE_GR_MODIFIED) | |
1259 | return 1; | |
1260 | ||
1261 | /* Also need to consider changes in reference and changed bits */ | |
1262 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
1263 | if ((hptp[0] & HPTE_V_VALID) && (hptp[1] & rcbits_unset)) | |
1264 | return 1; | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
a2932923 PM |
1269 | static long record_hpte(unsigned long flags, unsigned long *hptp, |
1270 | unsigned long *hpte, struct revmap_entry *revp, | |
1271 | int want_valid, int first_pass) | |
1272 | { | |
1273 | unsigned long v, r; | |
a1b4a0f6 | 1274 | unsigned long rcbits_unset; |
a2932923 PM |
1275 | int ok = 1; |
1276 | int valid, dirty; | |
1277 | ||
1278 | /* Unmodified entries are uninteresting except on the first pass */ | |
a1b4a0f6 | 1279 | dirty = hpte_dirty(revp, hptp); |
a2932923 PM |
1280 | if (!first_pass && !dirty) |
1281 | return 0; | |
1282 | ||
1283 | valid = 0; | |
1284 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
1285 | valid = 1; | |
1286 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && | |
1287 | !(hptp[0] & HPTE_V_BOLTED)) | |
1288 | valid = 0; | |
1289 | } | |
1290 | if (valid != want_valid) | |
1291 | return 0; | |
1292 | ||
1293 | v = r = 0; | |
1294 | if (valid || dirty) { | |
1295 | /* lock the HPTE so it's stable and read it */ | |
1296 | preempt_disable(); | |
1297 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
1298 | cpu_relax(); | |
1299 | v = hptp[0]; | |
a1b4a0f6 PM |
1300 | |
1301 | /* re-evaluate valid and dirty from synchronized HPTE value */ | |
1302 | valid = !!(v & HPTE_V_VALID); | |
1303 | dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED); | |
1304 | ||
1305 | /* Harvest R and C into guest view if necessary */ | |
1306 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
1307 | if (valid && (rcbits_unset & hptp[1])) { | |
1308 | revp->guest_rpte |= (hptp[1] & (HPTE_R_R | HPTE_R_C)) | | |
1309 | HPTE_GR_MODIFIED; | |
1310 | dirty = 1; | |
1311 | } | |
1312 | ||
a2932923 PM |
1313 | if (v & HPTE_V_ABSENT) { |
1314 | v &= ~HPTE_V_ABSENT; | |
1315 | v |= HPTE_V_VALID; | |
a1b4a0f6 | 1316 | valid = 1; |
a2932923 | 1317 | } |
a2932923 PM |
1318 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED)) |
1319 | valid = 0; | |
a1b4a0f6 PM |
1320 | |
1321 | r = revp->guest_rpte; | |
a2932923 PM |
1322 | /* only clear modified if this is the right sort of entry */ |
1323 | if (valid == want_valid && dirty) { | |
1324 | r &= ~HPTE_GR_MODIFIED; | |
1325 | revp->guest_rpte = r; | |
1326 | } | |
1327 | asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); | |
1328 | hptp[0] &= ~HPTE_V_HVLOCK; | |
1329 | preempt_enable(); | |
1330 | if (!(valid == want_valid && (first_pass || dirty))) | |
1331 | ok = 0; | |
1332 | } | |
1333 | hpte[0] = v; | |
1334 | hpte[1] = r; | |
1335 | return ok; | |
1336 | } | |
1337 | ||
1338 | static ssize_t kvm_htab_read(struct file *file, char __user *buf, | |
1339 | size_t count, loff_t *ppos) | |
1340 | { | |
1341 | struct kvm_htab_ctx *ctx = file->private_data; | |
1342 | struct kvm *kvm = ctx->kvm; | |
1343 | struct kvm_get_htab_header hdr; | |
1344 | unsigned long *hptp; | |
1345 | struct revmap_entry *revp; | |
1346 | unsigned long i, nb, nw; | |
1347 | unsigned long __user *lbuf; | |
1348 | struct kvm_get_htab_header __user *hptr; | |
1349 | unsigned long flags; | |
1350 | int first_pass; | |
1351 | unsigned long hpte[2]; | |
1352 | ||
1353 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
1354 | return -EFAULT; | |
1355 | ||
1356 | first_pass = ctx->first_pass; | |
1357 | flags = ctx->flags; | |
1358 | ||
1359 | i = ctx->index; | |
1360 | hptp = (unsigned long *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); | |
1361 | revp = kvm->arch.revmap + i; | |
1362 | lbuf = (unsigned long __user *)buf; | |
1363 | ||
1364 | nb = 0; | |
1365 | while (nb + sizeof(hdr) + HPTE_SIZE < count) { | |
1366 | /* Initialize header */ | |
1367 | hptr = (struct kvm_get_htab_header __user *)buf; | |
a2932923 PM |
1368 | hdr.n_valid = 0; |
1369 | hdr.n_invalid = 0; | |
1370 | nw = nb; | |
1371 | nb += sizeof(hdr); | |
1372 | lbuf = (unsigned long __user *)(buf + sizeof(hdr)); | |
1373 | ||
1374 | /* Skip uninteresting entries, i.e. clean on not-first pass */ | |
1375 | if (!first_pass) { | |
1376 | while (i < kvm->arch.hpt_npte && | |
a1b4a0f6 | 1377 | !hpte_dirty(revp, hptp)) { |
a2932923 PM |
1378 | ++i; |
1379 | hptp += 2; | |
1380 | ++revp; | |
1381 | } | |
1382 | } | |
05dd85f7 | 1383 | hdr.index = i; |
a2932923 PM |
1384 | |
1385 | /* Grab a series of valid entries */ | |
1386 | while (i < kvm->arch.hpt_npte && | |
1387 | hdr.n_valid < 0xffff && | |
1388 | nb + HPTE_SIZE < count && | |
1389 | record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { | |
1390 | /* valid entry, write it out */ | |
1391 | ++hdr.n_valid; | |
1392 | if (__put_user(hpte[0], lbuf) || | |
1393 | __put_user(hpte[1], lbuf + 1)) | |
1394 | return -EFAULT; | |
1395 | nb += HPTE_SIZE; | |
1396 | lbuf += 2; | |
1397 | ++i; | |
1398 | hptp += 2; | |
1399 | ++revp; | |
1400 | } | |
1401 | /* Now skip invalid entries while we can */ | |
1402 | while (i < kvm->arch.hpt_npte && | |
1403 | hdr.n_invalid < 0xffff && | |
1404 | record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { | |
1405 | /* found an invalid entry */ | |
1406 | ++hdr.n_invalid; | |
1407 | ++i; | |
1408 | hptp += 2; | |
1409 | ++revp; | |
1410 | } | |
1411 | ||
1412 | if (hdr.n_valid || hdr.n_invalid) { | |
1413 | /* write back the header */ | |
1414 | if (__copy_to_user(hptr, &hdr, sizeof(hdr))) | |
1415 | return -EFAULT; | |
1416 | nw = nb; | |
1417 | buf = (char __user *)lbuf; | |
1418 | } else { | |
1419 | nb = nw; | |
1420 | } | |
1421 | ||
1422 | /* Check if we've wrapped around the hash table */ | |
1423 | if (i >= kvm->arch.hpt_npte) { | |
1424 | i = 0; | |
1425 | ctx->first_pass = 0; | |
1426 | break; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | ctx->index = i; | |
1431 | ||
1432 | return nb; | |
1433 | } | |
1434 | ||
1435 | static ssize_t kvm_htab_write(struct file *file, const char __user *buf, | |
1436 | size_t count, loff_t *ppos) | |
1437 | { | |
1438 | struct kvm_htab_ctx *ctx = file->private_data; | |
1439 | struct kvm *kvm = ctx->kvm; | |
1440 | struct kvm_get_htab_header hdr; | |
1441 | unsigned long i, j; | |
1442 | unsigned long v, r; | |
1443 | unsigned long __user *lbuf; | |
1444 | unsigned long *hptp; | |
1445 | unsigned long tmp[2]; | |
1446 | ssize_t nb; | |
1447 | long int err, ret; | |
1448 | int rma_setup; | |
1449 | ||
1450 | if (!access_ok(VERIFY_READ, buf, count)) | |
1451 | return -EFAULT; | |
1452 | ||
1453 | /* lock out vcpus from running while we're doing this */ | |
1454 | mutex_lock(&kvm->lock); | |
1455 | rma_setup = kvm->arch.rma_setup_done; | |
1456 | if (rma_setup) { | |
1457 | kvm->arch.rma_setup_done = 0; /* temporarily */ | |
1458 | /* order rma_setup_done vs. vcpus_running */ | |
1459 | smp_mb(); | |
1460 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1461 | kvm->arch.rma_setup_done = 1; | |
1462 | mutex_unlock(&kvm->lock); | |
1463 | return -EBUSY; | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | err = 0; | |
1468 | for (nb = 0; nb + sizeof(hdr) <= count; ) { | |
1469 | err = -EFAULT; | |
1470 | if (__copy_from_user(&hdr, buf, sizeof(hdr))) | |
1471 | break; | |
1472 | ||
1473 | err = 0; | |
1474 | if (nb + hdr.n_valid * HPTE_SIZE > count) | |
1475 | break; | |
1476 | ||
1477 | nb += sizeof(hdr); | |
1478 | buf += sizeof(hdr); | |
1479 | ||
1480 | err = -EINVAL; | |
1481 | i = hdr.index; | |
1482 | if (i >= kvm->arch.hpt_npte || | |
1483 | i + hdr.n_valid + hdr.n_invalid > kvm->arch.hpt_npte) | |
1484 | break; | |
1485 | ||
1486 | hptp = (unsigned long *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); | |
1487 | lbuf = (unsigned long __user *)buf; | |
1488 | for (j = 0; j < hdr.n_valid; ++j) { | |
1489 | err = -EFAULT; | |
1490 | if (__get_user(v, lbuf) || __get_user(r, lbuf + 1)) | |
1491 | goto out; | |
1492 | err = -EINVAL; | |
1493 | if (!(v & HPTE_V_VALID)) | |
1494 | goto out; | |
1495 | lbuf += 2; | |
1496 | nb += HPTE_SIZE; | |
1497 | ||
1498 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) | |
1499 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); | |
1500 | err = -EIO; | |
1501 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r, | |
1502 | tmp); | |
1503 | if (ret != H_SUCCESS) { | |
1504 | pr_err("kvm_htab_write ret %ld i=%ld v=%lx " | |
1505 | "r=%lx\n", ret, i, v, r); | |
1506 | goto out; | |
1507 | } | |
1508 | if (!rma_setup && is_vrma_hpte(v)) { | |
1509 | unsigned long psize = hpte_page_size(v, r); | |
1510 | unsigned long senc = slb_pgsize_encoding(psize); | |
1511 | unsigned long lpcr; | |
1512 | ||
1513 | kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | | |
1514 | (VRMA_VSID << SLB_VSID_SHIFT_1T); | |
1515 | lpcr = kvm->arch.lpcr & ~LPCR_VRMASD; | |
1516 | lpcr |= senc << (LPCR_VRMASD_SH - 4); | |
1517 | kvm->arch.lpcr = lpcr; | |
1518 | rma_setup = 1; | |
1519 | } | |
1520 | ++i; | |
1521 | hptp += 2; | |
1522 | } | |
1523 | ||
1524 | for (j = 0; j < hdr.n_invalid; ++j) { | |
1525 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) | |
1526 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); | |
1527 | ++i; | |
1528 | hptp += 2; | |
1529 | } | |
1530 | err = 0; | |
1531 | } | |
1532 | ||
1533 | out: | |
1534 | /* Order HPTE updates vs. rma_setup_done */ | |
1535 | smp_wmb(); | |
1536 | kvm->arch.rma_setup_done = rma_setup; | |
1537 | mutex_unlock(&kvm->lock); | |
1538 | ||
1539 | if (err) | |
1540 | return err; | |
1541 | return nb; | |
1542 | } | |
1543 | ||
1544 | static int kvm_htab_release(struct inode *inode, struct file *filp) | |
1545 | { | |
1546 | struct kvm_htab_ctx *ctx = filp->private_data; | |
1547 | ||
1548 | filp->private_data = NULL; | |
1549 | if (!(ctx->flags & KVM_GET_HTAB_WRITE)) | |
1550 | atomic_dec(&ctx->kvm->arch.hpte_mod_interest); | |
1551 | kvm_put_kvm(ctx->kvm); | |
1552 | kfree(ctx); | |
1553 | return 0; | |
1554 | } | |
1555 | ||
75ef9de1 | 1556 | static const struct file_operations kvm_htab_fops = { |
a2932923 PM |
1557 | .read = kvm_htab_read, |
1558 | .write = kvm_htab_write, | |
1559 | .llseek = default_llseek, | |
1560 | .release = kvm_htab_release, | |
1561 | }; | |
1562 | ||
1563 | int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf) | |
1564 | { | |
1565 | int ret; | |
1566 | struct kvm_htab_ctx *ctx; | |
1567 | int rwflag; | |
1568 | ||
1569 | /* reject flags we don't recognize */ | |
1570 | if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE)) | |
1571 | return -EINVAL; | |
1572 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1573 | if (!ctx) | |
1574 | return -ENOMEM; | |
1575 | kvm_get_kvm(kvm); | |
1576 | ctx->kvm = kvm; | |
1577 | ctx->index = ghf->start_index; | |
1578 | ctx->flags = ghf->flags; | |
1579 | ctx->first_pass = 1; | |
1580 | ||
1581 | rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; | |
1582 | ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag); | |
1583 | if (ret < 0) { | |
1584 | kvm_put_kvm(kvm); | |
1585 | return ret; | |
1586 | } | |
1587 | ||
1588 | if (rwflag == O_RDONLY) { | |
1589 | mutex_lock(&kvm->slots_lock); | |
1590 | atomic_inc(&kvm->arch.hpte_mod_interest); | |
1591 | /* make sure kvmppc_do_h_enter etc. see the increment */ | |
1592 | synchronize_srcu_expedited(&kvm->srcu); | |
1593 | mutex_unlock(&kvm->slots_lock); | |
1594 | } | |
1595 | ||
1596 | return ret; | |
1597 | } | |
1598 | ||
de56a948 PM |
1599 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
1600 | { | |
1601 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
1602 | ||
9e368f29 PM |
1603 | if (cpu_has_feature(CPU_FTR_ARCH_206)) |
1604 | vcpu->arch.slb_nr = 32; /* POWER7 */ | |
1605 | else | |
1606 | vcpu->arch.slb_nr = 64; | |
de56a948 PM |
1607 | |
1608 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; | |
1609 | mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr; | |
1610 | ||
1611 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
1612 | } |