]>
Commit | Line | Data |
---|---|---|
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 | ||
990978e9 AK |
40 | #include "book3s_hv_cma.h" |
41 | ||
9e368f29 PM |
42 | /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ |
43 | #define MAX_LPID_970 63 | |
de56a948 | 44 | |
32fad281 PM |
45 | /* Power architecture requires HPT is at least 256kB */ |
46 | #define PPC_MIN_HPT_ORDER 18 | |
47 | ||
7ed661bf PM |
48 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
49 | long pte_index, unsigned long pteh, | |
50 | unsigned long ptel, unsigned long *pte_idx_ret); | |
a64fd707 | 51 | static void kvmppc_rmap_reset(struct kvm *kvm); |
7ed661bf | 52 | |
32fad281 | 53 | long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp) |
de56a948 PM |
54 | { |
55 | unsigned long hpt; | |
8936dda4 | 56 | struct revmap_entry *rev; |
fa61a4e3 AK |
57 | struct page *page = NULL; |
58 | long order = KVM_DEFAULT_HPT_ORDER; | |
de56a948 | 59 | |
32fad281 PM |
60 | if (htab_orderp) { |
61 | order = *htab_orderp; | |
62 | if (order < PPC_MIN_HPT_ORDER) | |
63 | order = PPC_MIN_HPT_ORDER; | |
64 | } | |
65 | ||
fa61a4e3 | 66 | kvm->arch.hpt_cma_alloc = 0; |
32fad281 | 67 | /* |
32fad281 | 68 | * try first to allocate it from the kernel page allocator. |
fa61a4e3 | 69 | * We keep the CMA reserved for failed allocation. |
32fad281 | 70 | */ |
fa61a4e3 AK |
71 | hpt = __get_free_pages(GFP_KERNEL | __GFP_ZERO | __GFP_REPEAT | |
72 | __GFP_NOWARN, order - PAGE_SHIFT); | |
d2a1b483 | 73 | |
32fad281 | 74 | /* Next try to allocate from the preallocated pool */ |
de56a948 | 75 | if (!hpt) { |
990978e9 | 76 | VM_BUG_ON(order < KVM_CMA_CHUNK_ORDER); |
fa61a4e3 AK |
77 | page = kvm_alloc_hpt(1 << (order - PAGE_SHIFT)); |
78 | if (page) { | |
79 | hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page)); | |
80 | kvm->arch.hpt_cma_alloc = 1; | |
81 | } else | |
82 | --order; | |
de56a948 | 83 | } |
32fad281 PM |
84 | |
85 | /* Lastly try successively smaller sizes from the page allocator */ | |
86 | while (!hpt && order > PPC_MIN_HPT_ORDER) { | |
87 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| | |
88 | __GFP_NOWARN, order - PAGE_SHIFT); | |
89 | if (!hpt) | |
90 | --order; | |
91 | } | |
92 | ||
93 | if (!hpt) | |
94 | return -ENOMEM; | |
95 | ||
de56a948 | 96 | kvm->arch.hpt_virt = hpt; |
32fad281 PM |
97 | kvm->arch.hpt_order = order; |
98 | /* HPTEs are 2**4 bytes long */ | |
99 | kvm->arch.hpt_npte = 1ul << (order - 4); | |
100 | /* 128 (2**7) bytes in each HPTEG */ | |
101 | kvm->arch.hpt_mask = (1ul << (order - 7)) - 1; | |
de56a948 | 102 | |
8936dda4 | 103 | /* Allocate reverse map array */ |
32fad281 | 104 | rev = vmalloc(sizeof(struct revmap_entry) * kvm->arch.hpt_npte); |
8936dda4 PM |
105 | if (!rev) { |
106 | pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n"); | |
107 | goto out_freehpt; | |
108 | } | |
109 | kvm->arch.revmap = rev; | |
32fad281 | 110 | kvm->arch.sdr1 = __pa(hpt) | (order - 18); |
8936dda4 | 111 | |
32fad281 PM |
112 | pr_info("KVM guest htab at %lx (order %ld), LPID %x\n", |
113 | hpt, order, kvm->arch.lpid); | |
de56a948 | 114 | |
32fad281 PM |
115 | if (htab_orderp) |
116 | *htab_orderp = order; | |
de56a948 | 117 | return 0; |
8936dda4 | 118 | |
8936dda4 | 119 | out_freehpt: |
fa61a4e3 AK |
120 | if (kvm->arch.hpt_cma_alloc) |
121 | kvm_release_hpt(page, 1 << (order - PAGE_SHIFT)); | |
32fad281 PM |
122 | else |
123 | free_pages(hpt, order - PAGE_SHIFT); | |
8936dda4 | 124 | return -ENOMEM; |
de56a948 PM |
125 | } |
126 | ||
32fad281 PM |
127 | long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp) |
128 | { | |
129 | long err = -EBUSY; | |
130 | long order; | |
131 | ||
132 | mutex_lock(&kvm->lock); | |
133 | if (kvm->arch.rma_setup_done) { | |
134 | kvm->arch.rma_setup_done = 0; | |
135 | /* order rma_setup_done vs. vcpus_running */ | |
136 | smp_mb(); | |
137 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
138 | kvm->arch.rma_setup_done = 1; | |
139 | goto out; | |
140 | } | |
141 | } | |
142 | if (kvm->arch.hpt_virt) { | |
143 | order = kvm->arch.hpt_order; | |
144 | /* Set the entire HPT to 0, i.e. invalid HPTEs */ | |
145 | memset((void *)kvm->arch.hpt_virt, 0, 1ul << order); | |
a64fd707 PM |
146 | /* |
147 | * Reset all the reverse-mapping chains for all memslots | |
148 | */ | |
149 | kvmppc_rmap_reset(kvm); | |
1b400ba0 PM |
150 | /* Ensure that each vcpu will flush its TLB on next entry. */ |
151 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
32fad281 PM |
152 | *htab_orderp = order; |
153 | err = 0; | |
154 | } else { | |
155 | err = kvmppc_alloc_hpt(kvm, htab_orderp); | |
156 | order = *htab_orderp; | |
157 | } | |
158 | out: | |
159 | mutex_unlock(&kvm->lock); | |
160 | return err; | |
161 | } | |
162 | ||
de56a948 PM |
163 | void kvmppc_free_hpt(struct kvm *kvm) |
164 | { | |
043cc4d7 | 165 | kvmppc_free_lpid(kvm->arch.lpid); |
8936dda4 | 166 | vfree(kvm->arch.revmap); |
fa61a4e3 AK |
167 | if (kvm->arch.hpt_cma_alloc) |
168 | kvm_release_hpt(virt_to_page(kvm->arch.hpt_virt), | |
169 | 1 << (kvm->arch.hpt_order - PAGE_SHIFT)); | |
d2a1b483 | 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 | ||
de56a948 PM |
263 | static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) |
264 | { | |
265 | kvmppc_set_msr(vcpu, MSR_SF | MSR_ME); | |
266 | } | |
267 | ||
c77162de PM |
268 | /* |
269 | * This is called to get a reference to a guest page if there isn't | |
a66b48c3 | 270 | * one already in the memslot->arch.slot_phys[] array. |
c77162de PM |
271 | */ |
272 | static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, | |
da9d1d7f PM |
273 | struct kvm_memory_slot *memslot, |
274 | unsigned long psize) | |
c77162de PM |
275 | { |
276 | unsigned long start; | |
da9d1d7f PM |
277 | long np, err; |
278 | struct page *page, *hpage, *pages[1]; | |
279 | unsigned long s, pgsize; | |
c77162de | 280 | unsigned long *physp; |
9d0ef5ea PM |
281 | unsigned int is_io, got, pgorder; |
282 | struct vm_area_struct *vma; | |
da9d1d7f | 283 | unsigned long pfn, i, npages; |
c77162de | 284 | |
a66b48c3 | 285 | physp = memslot->arch.slot_phys; |
c77162de PM |
286 | if (!physp) |
287 | return -EINVAL; | |
da9d1d7f | 288 | if (physp[gfn - memslot->base_gfn]) |
c77162de PM |
289 | return 0; |
290 | ||
9d0ef5ea PM |
291 | is_io = 0; |
292 | got = 0; | |
c77162de | 293 | page = NULL; |
da9d1d7f | 294 | pgsize = psize; |
9d0ef5ea | 295 | err = -EINVAL; |
c77162de PM |
296 | start = gfn_to_hva_memslot(memslot, gfn); |
297 | ||
298 | /* Instantiate and get the page we want access to */ | |
299 | np = get_user_pages_fast(start, 1, 1, pages); | |
9d0ef5ea PM |
300 | if (np != 1) { |
301 | /* Look up the vma for the page */ | |
302 | down_read(¤t->mm->mmap_sem); | |
303 | vma = find_vma(current->mm, start); | |
304 | if (!vma || vma->vm_start > start || | |
305 | start + psize > vma->vm_end || | |
306 | !(vma->vm_flags & VM_PFNMAP)) | |
307 | goto up_err; | |
308 | is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); | |
309 | pfn = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); | |
310 | /* check alignment of pfn vs. requested page size */ | |
311 | if (psize > PAGE_SIZE && (pfn & ((psize >> PAGE_SHIFT) - 1))) | |
312 | goto up_err; | |
313 | up_read(¤t->mm->mmap_sem); | |
314 | ||
315 | } else { | |
316 | page = pages[0]; | |
317 | got = KVMPPC_GOT_PAGE; | |
318 | ||
319 | /* See if this is a large page */ | |
320 | s = PAGE_SIZE; | |
321 | if (PageHuge(page)) { | |
322 | hpage = compound_head(page); | |
323 | s <<= compound_order(hpage); | |
324 | /* Get the whole large page if slot alignment is ok */ | |
325 | if (s > psize && slot_is_aligned(memslot, s) && | |
326 | !(memslot->userspace_addr & (s - 1))) { | |
327 | start &= ~(s - 1); | |
328 | pgsize = s; | |
de6c0b02 DG |
329 | get_page(hpage); |
330 | put_page(page); | |
9d0ef5ea PM |
331 | page = hpage; |
332 | } | |
da9d1d7f | 333 | } |
9d0ef5ea PM |
334 | if (s < psize) |
335 | goto out; | |
336 | pfn = page_to_pfn(page); | |
c77162de | 337 | } |
c77162de | 338 | |
da9d1d7f PM |
339 | npages = pgsize >> PAGE_SHIFT; |
340 | pgorder = __ilog2(npages); | |
341 | physp += (gfn - memslot->base_gfn) & ~(npages - 1); | |
c77162de | 342 | spin_lock(&kvm->arch.slot_phys_lock); |
da9d1d7f PM |
343 | for (i = 0; i < npages; ++i) { |
344 | if (!physp[i]) { | |
9d0ef5ea PM |
345 | physp[i] = ((pfn + i) << PAGE_SHIFT) + |
346 | got + is_io + pgorder; | |
da9d1d7f PM |
347 | got = 0; |
348 | } | |
349 | } | |
c77162de | 350 | spin_unlock(&kvm->arch.slot_phys_lock); |
da9d1d7f | 351 | err = 0; |
c77162de | 352 | |
da9d1d7f | 353 | out: |
de6c0b02 | 354 | if (got) |
da9d1d7f | 355 | put_page(page); |
da9d1d7f | 356 | return err; |
9d0ef5ea PM |
357 | |
358 | up_err: | |
359 | up_read(¤t->mm->mmap_sem); | |
360 | return err; | |
c77162de PM |
361 | } |
362 | ||
7ed661bf PM |
363 | long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
364 | long pte_index, unsigned long pteh, | |
365 | unsigned long ptel, unsigned long *pte_idx_ret) | |
c77162de | 366 | { |
c77162de PM |
367 | unsigned long psize, gpa, gfn; |
368 | struct kvm_memory_slot *memslot; | |
369 | long ret; | |
370 | ||
342d3db7 PM |
371 | if (kvm->arch.using_mmu_notifiers) |
372 | goto do_insert; | |
373 | ||
c77162de PM |
374 | psize = hpte_page_size(pteh, ptel); |
375 | if (!psize) | |
376 | return H_PARAMETER; | |
377 | ||
697d3899 PM |
378 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
379 | ||
c77162de PM |
380 | /* Find the memslot (if any) for this address */ |
381 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); | |
382 | gfn = gpa >> PAGE_SHIFT; | |
383 | memslot = gfn_to_memslot(kvm, gfn); | |
697d3899 PM |
384 | if (memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)) { |
385 | if (!slot_is_aligned(memslot, psize)) | |
386 | return H_PARAMETER; | |
387 | if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0) | |
388 | return H_PARAMETER; | |
389 | } | |
c77162de | 390 | |
342d3db7 PM |
391 | do_insert: |
392 | /* Protect linux PTE lookup from page table destruction */ | |
393 | rcu_read_lock_sched(); /* this disables preemption too */ | |
7ed661bf PM |
394 | ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, |
395 | current->mm->pgd, false, pte_idx_ret); | |
342d3db7 | 396 | rcu_read_unlock_sched(); |
c77162de PM |
397 | if (ret == H_TOO_HARD) { |
398 | /* this can't happen */ | |
399 | pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); | |
400 | ret = H_RESOURCE; /* or something */ | |
401 | } | |
402 | return ret; | |
403 | ||
404 | } | |
405 | ||
7ed661bf PM |
406 | /* |
407 | * We come here on a H_ENTER call from the guest when we are not | |
408 | * using mmu notifiers and we don't have the requested page pinned | |
409 | * already. | |
410 | */ | |
411 | long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, | |
412 | long pte_index, unsigned long pteh, | |
413 | unsigned long ptel) | |
414 | { | |
415 | return kvmppc_virtmode_do_h_enter(vcpu->kvm, flags, pte_index, | |
416 | pteh, ptel, &vcpu->arch.gpr[4]); | |
417 | } | |
418 | ||
697d3899 PM |
419 | static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, |
420 | gva_t eaddr) | |
421 | { | |
422 | u64 mask; | |
423 | int i; | |
424 | ||
425 | for (i = 0; i < vcpu->arch.slb_nr; i++) { | |
426 | if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) | |
427 | continue; | |
428 | ||
429 | if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) | |
430 | mask = ESID_MASK_1T; | |
431 | else | |
432 | mask = ESID_MASK; | |
433 | ||
434 | if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) | |
435 | return &vcpu->arch.slb[i]; | |
436 | } | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, | |
441 | unsigned long ea) | |
442 | { | |
443 | unsigned long ra_mask; | |
444 | ||
445 | ra_mask = hpte_page_size(v, r) - 1; | |
446 | return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); | |
447 | } | |
448 | ||
de56a948 | 449 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
93b159b4 | 450 | struct kvmppc_pte *gpte, bool data, bool iswrite) |
de56a948 | 451 | { |
697d3899 PM |
452 | struct kvm *kvm = vcpu->kvm; |
453 | struct kvmppc_slb *slbe; | |
454 | unsigned long slb_v; | |
455 | unsigned long pp, key; | |
456 | unsigned long v, gr; | |
457 | unsigned long *hptep; | |
458 | int index; | |
459 | int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); | |
460 | ||
461 | /* Get SLB entry */ | |
462 | if (virtmode) { | |
463 | slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); | |
464 | if (!slbe) | |
465 | return -EINVAL; | |
466 | slb_v = slbe->origv; | |
467 | } else { | |
468 | /* real mode access */ | |
469 | slb_v = vcpu->kvm->arch.vrma_slb_v; | |
470 | } | |
471 | ||
472 | /* Find the HPTE in the hash table */ | |
473 | index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, | |
474 | HPTE_V_VALID | HPTE_V_ABSENT); | |
475 | if (index < 0) | |
476 | return -ENOENT; | |
477 | hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); | |
478 | v = hptep[0] & ~HPTE_V_HVLOCK; | |
479 | gr = kvm->arch.revmap[index].guest_rpte; | |
480 | ||
481 | /* Unlock the HPTE */ | |
482 | asm volatile("lwsync" : : : "memory"); | |
483 | hptep[0] = v; | |
484 | ||
485 | gpte->eaddr = eaddr; | |
486 | gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); | |
487 | ||
488 | /* Get PP bits and key for permission check */ | |
489 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
490 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
491 | key &= slb_v; | |
492 | ||
493 | /* Calculate permissions */ | |
494 | gpte->may_read = hpte_read_permission(pp, key); | |
495 | gpte->may_write = hpte_write_permission(pp, key); | |
496 | gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); | |
497 | ||
498 | /* Storage key permission check for POWER7 */ | |
499 | if (data && virtmode && cpu_has_feature(CPU_FTR_ARCH_206)) { | |
500 | int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); | |
501 | if (amrfield & 1) | |
502 | gpte->may_read = 0; | |
503 | if (amrfield & 2) | |
504 | gpte->may_write = 0; | |
505 | } | |
506 | ||
507 | /* Get the guest physical address */ | |
508 | gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Quick test for whether an instruction is a load or a store. | |
514 | * If the instruction is a load or a store, then this will indicate | |
515 | * which it is, at least on server processors. (Embedded processors | |
516 | * have some external PID instructions that don't follow the rule | |
517 | * embodied here.) If the instruction isn't a load or store, then | |
518 | * this doesn't return anything useful. | |
519 | */ | |
520 | static int instruction_is_store(unsigned int instr) | |
521 | { | |
522 | unsigned int mask; | |
523 | ||
524 | mask = 0x10000000; | |
525 | if ((instr & 0xfc000000) == 0x7c000000) | |
526 | mask = 0x100; /* major opcode 31 */ | |
527 | return (instr & mask) != 0; | |
528 | } | |
529 | ||
530 | static int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
6020c0f6 | 531 | unsigned long gpa, gva_t ea, int is_store) |
697d3899 PM |
532 | { |
533 | int ret; | |
534 | u32 last_inst; | |
535 | unsigned long srr0 = kvmppc_get_pc(vcpu); | |
536 | ||
537 | /* We try to load the last instruction. We don't let | |
538 | * emulate_instruction do it as it doesn't check what | |
539 | * kvmppc_ld returns. | |
540 | * If we fail, we just return to the guest and try executing it again. | |
541 | */ | |
542 | if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) { | |
543 | ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); | |
544 | if (ret != EMULATE_DONE || last_inst == KVM_INST_FETCH_FAILED) | |
545 | return RESUME_GUEST; | |
546 | vcpu->arch.last_inst = last_inst; | |
547 | } | |
548 | ||
549 | /* | |
550 | * WARNING: We do not know for sure whether the instruction we just | |
551 | * read from memory is the same that caused the fault in the first | |
552 | * place. If the instruction we read is neither an load or a store, | |
553 | * then it can't access memory, so we don't need to worry about | |
554 | * enforcing access permissions. So, assuming it is a load or | |
555 | * store, we just check that its direction (load or store) is | |
556 | * consistent with the original fault, since that's what we | |
557 | * checked the access permissions against. If there is a mismatch | |
558 | * we just return and retry the instruction. | |
559 | */ | |
560 | ||
561 | if (instruction_is_store(vcpu->arch.last_inst) != !!is_store) | |
562 | return RESUME_GUEST; | |
563 | ||
564 | /* | |
565 | * Emulated accesses are emulated by looking at the hash for | |
566 | * translation once, then performing the access later. The | |
567 | * translation could be invalidated in the meantime in which | |
568 | * point performing the subsequent memory access on the old | |
569 | * physical address could possibly be a security hole for the | |
570 | * guest (but not the host). | |
571 | * | |
572 | * This is less of an issue for MMIO stores since they aren't | |
573 | * globally visible. It could be an issue for MMIO loads to | |
574 | * a certain extent but we'll ignore it for now. | |
575 | */ | |
576 | ||
577 | vcpu->arch.paddr_accessed = gpa; | |
6020c0f6 | 578 | vcpu->arch.vaddr_accessed = ea; |
697d3899 PM |
579 | return kvmppc_emulate_mmio(run, vcpu); |
580 | } | |
581 | ||
582 | int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
583 | unsigned long ea, unsigned long dsisr) | |
584 | { | |
585 | struct kvm *kvm = vcpu->kvm; | |
342d3db7 PM |
586 | unsigned long *hptep, hpte[3], r; |
587 | unsigned long mmu_seq, psize, pte_size; | |
70bddfef | 588 | unsigned long gpa, gfn, hva, pfn; |
697d3899 | 589 | struct kvm_memory_slot *memslot; |
342d3db7 | 590 | unsigned long *rmap; |
697d3899 | 591 | struct revmap_entry *rev; |
342d3db7 PM |
592 | struct page *page, *pages[1]; |
593 | long index, ret, npages; | |
594 | unsigned long is_io; | |
4cf302bc | 595 | unsigned int writing, write_ok; |
342d3db7 | 596 | struct vm_area_struct *vma; |
bad3b507 | 597 | unsigned long rcbits; |
697d3899 PM |
598 | |
599 | /* | |
600 | * Real-mode code has already searched the HPT and found the | |
601 | * entry we're interested in. Lock the entry and check that | |
602 | * it hasn't changed. If it has, just return and re-execute the | |
603 | * instruction. | |
604 | */ | |
605 | if (ea != vcpu->arch.pgfault_addr) | |
606 | return RESUME_GUEST; | |
607 | index = vcpu->arch.pgfault_index; | |
608 | hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); | |
609 | rev = &kvm->arch.revmap[index]; | |
610 | preempt_disable(); | |
611 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
612 | cpu_relax(); | |
613 | hpte[0] = hptep[0] & ~HPTE_V_HVLOCK; | |
614 | hpte[1] = hptep[1]; | |
342d3db7 | 615 | hpte[2] = r = rev->guest_rpte; |
697d3899 PM |
616 | asm volatile("lwsync" : : : "memory"); |
617 | hptep[0] = hpte[0]; | |
618 | preempt_enable(); | |
619 | ||
620 | if (hpte[0] != vcpu->arch.pgfault_hpte[0] || | |
621 | hpte[1] != vcpu->arch.pgfault_hpte[1]) | |
622 | return RESUME_GUEST; | |
623 | ||
624 | /* Translate the logical address and get the page */ | |
342d3db7 | 625 | psize = hpte_page_size(hpte[0], r); |
70bddfef PM |
626 | gpa = (r & HPTE_R_RPN & ~(psize - 1)) | (ea & (psize - 1)); |
627 | gfn = gpa >> PAGE_SHIFT; | |
697d3899 PM |
628 | memslot = gfn_to_memslot(kvm, gfn); |
629 | ||
630 | /* No memslot means it's an emulated MMIO region */ | |
70bddfef | 631 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
6020c0f6 | 632 | return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, |
697d3899 | 633 | dsisr & DSISR_ISSTORE); |
697d3899 | 634 | |
342d3db7 PM |
635 | if (!kvm->arch.using_mmu_notifiers) |
636 | return -EFAULT; /* should never get here */ | |
637 | ||
638 | /* used to check for invalidations in progress */ | |
639 | mmu_seq = kvm->mmu_notifier_seq; | |
640 | smp_rmb(); | |
641 | ||
642 | is_io = 0; | |
643 | pfn = 0; | |
644 | page = NULL; | |
645 | pte_size = PAGE_SIZE; | |
4cf302bc PM |
646 | writing = (dsisr & DSISR_ISSTORE) != 0; |
647 | /* If writing != 0, then the HPTE must allow writing, if we get here */ | |
648 | write_ok = writing; | |
342d3db7 | 649 | hva = gfn_to_hva_memslot(memslot, gfn); |
4cf302bc | 650 | npages = get_user_pages_fast(hva, 1, writing, pages); |
342d3db7 PM |
651 | if (npages < 1) { |
652 | /* Check if it's an I/O mapping */ | |
653 | down_read(¤t->mm->mmap_sem); | |
654 | vma = find_vma(current->mm, hva); | |
655 | if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end && | |
656 | (vma->vm_flags & VM_PFNMAP)) { | |
657 | pfn = vma->vm_pgoff + | |
658 | ((hva - vma->vm_start) >> PAGE_SHIFT); | |
659 | pte_size = psize; | |
660 | is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); | |
4cf302bc | 661 | write_ok = vma->vm_flags & VM_WRITE; |
342d3db7 PM |
662 | } |
663 | up_read(¤t->mm->mmap_sem); | |
664 | if (!pfn) | |
665 | return -EFAULT; | |
666 | } else { | |
667 | page = pages[0]; | |
668 | if (PageHuge(page)) { | |
669 | page = compound_head(page); | |
670 | pte_size <<= compound_order(page); | |
671 | } | |
4cf302bc PM |
672 | /* if the guest wants write access, see if that is OK */ |
673 | if (!writing && hpte_is_writable(r)) { | |
db7cb5b9 | 674 | unsigned int hugepage_shift; |
4cf302bc PM |
675 | pte_t *ptep, pte; |
676 | ||
677 | /* | |
678 | * We need to protect against page table destruction | |
679 | * while looking up and updating the pte. | |
680 | */ | |
681 | rcu_read_lock_sched(); | |
682 | ptep = find_linux_pte_or_hugepte(current->mm->pgd, | |
db7cb5b9 AK |
683 | hva, &hugepage_shift); |
684 | if (ptep) { | |
685 | pte = kvmppc_read_update_linux_pte(ptep, 1, | |
686 | hugepage_shift); | |
4cf302bc PM |
687 | if (pte_write(pte)) |
688 | write_ok = 1; | |
689 | } | |
690 | rcu_read_unlock_sched(); | |
691 | } | |
342d3db7 PM |
692 | pfn = page_to_pfn(page); |
693 | } | |
694 | ||
695 | ret = -EFAULT; | |
696 | if (psize > pte_size) | |
697 | goto out_put; | |
698 | ||
699 | /* Check WIMG vs. the actual page we're accessing */ | |
700 | if (!hpte_cache_flags_ok(r, is_io)) { | |
701 | if (is_io) | |
702 | return -EFAULT; | |
703 | /* | |
704 | * Allow guest to map emulated device memory as | |
705 | * uncacheable, but actually make it cacheable. | |
706 | */ | |
707 | r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; | |
708 | } | |
709 | ||
710 | /* Set the HPTE to point to pfn */ | |
711 | r = (r & ~(HPTE_R_PP0 - pte_size)) | (pfn << PAGE_SHIFT); | |
4cf302bc PM |
712 | if (hpte_is_writable(r) && !write_ok) |
713 | r = hpte_make_readonly(r); | |
342d3db7 PM |
714 | ret = RESUME_GUEST; |
715 | preempt_disable(); | |
716 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
717 | cpu_relax(); | |
718 | if ((hptep[0] & ~HPTE_V_HVLOCK) != hpte[0] || hptep[1] != hpte[1] || | |
719 | rev->guest_rpte != hpte[2]) | |
720 | /* HPTE has been changed under us; let the guest retry */ | |
721 | goto out_unlock; | |
722 | hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
723 | ||
d89cc617 | 724 | rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
342d3db7 PM |
725 | lock_rmap(rmap); |
726 | ||
727 | /* Check if we might have been invalidated; let the guest retry if so */ | |
728 | ret = RESUME_GUEST; | |
8ca40a70 | 729 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) { |
342d3db7 PM |
730 | unlock_rmap(rmap); |
731 | goto out_unlock; | |
732 | } | |
4cf302bc | 733 | |
bad3b507 PM |
734 | /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ |
735 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
736 | r &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
737 | ||
4cf302bc PM |
738 | if (hptep[0] & HPTE_V_VALID) { |
739 | /* HPTE was previously valid, so we need to invalidate it */ | |
740 | unlock_rmap(rmap); | |
741 | hptep[0] |= HPTE_V_ABSENT; | |
742 | kvmppc_invalidate_hpte(kvm, hptep, index); | |
bad3b507 PM |
743 | /* don't lose previous R and C bits */ |
744 | r |= hptep[1] & (HPTE_R_R | HPTE_R_C); | |
4cf302bc PM |
745 | } else { |
746 | kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); | |
747 | } | |
342d3db7 PM |
748 | |
749 | hptep[1] = r; | |
750 | eieio(); | |
751 | hptep[0] = hpte[0]; | |
752 | asm volatile("ptesync" : : : "memory"); | |
753 | preempt_enable(); | |
4cf302bc | 754 | if (page && hpte_is_writable(r)) |
342d3db7 PM |
755 | SetPageDirty(page); |
756 | ||
757 | out_put: | |
de6c0b02 DG |
758 | if (page) { |
759 | /* | |
760 | * We drop pages[0] here, not page because page might | |
761 | * have been set to the head page of a compound, but | |
762 | * we have to drop the reference on the correct tail | |
763 | * page to match the get inside gup() | |
764 | */ | |
765 | put_page(pages[0]); | |
766 | } | |
342d3db7 PM |
767 | return ret; |
768 | ||
769 | out_unlock: | |
770 | hptep[0] &= ~HPTE_V_HVLOCK; | |
771 | preempt_enable(); | |
772 | goto out_put; | |
773 | } | |
774 | ||
a64fd707 PM |
775 | static void kvmppc_rmap_reset(struct kvm *kvm) |
776 | { | |
777 | struct kvm_memslots *slots; | |
778 | struct kvm_memory_slot *memslot; | |
779 | int srcu_idx; | |
780 | ||
781 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
782 | slots = kvm->memslots; | |
783 | kvm_for_each_memslot(memslot, slots) { | |
784 | /* | |
785 | * This assumes it is acceptable to lose reference and | |
786 | * change bits across a reset. | |
787 | */ | |
788 | memset(memslot->arch.rmap, 0, | |
789 | memslot->npages * sizeof(*memslot->arch.rmap)); | |
790 | } | |
791 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
792 | } | |
793 | ||
84504ef3 TY |
794 | static int kvm_handle_hva_range(struct kvm *kvm, |
795 | unsigned long start, | |
796 | unsigned long end, | |
797 | int (*handler)(struct kvm *kvm, | |
798 | unsigned long *rmapp, | |
799 | unsigned long gfn)) | |
342d3db7 PM |
800 | { |
801 | int ret; | |
802 | int retval = 0; | |
803 | struct kvm_memslots *slots; | |
804 | struct kvm_memory_slot *memslot; | |
805 | ||
806 | slots = kvm_memslots(kvm); | |
807 | kvm_for_each_memslot(memslot, slots) { | |
84504ef3 TY |
808 | unsigned long hva_start, hva_end; |
809 | gfn_t gfn, gfn_end; | |
810 | ||
811 | hva_start = max(start, memslot->userspace_addr); | |
812 | hva_end = min(end, memslot->userspace_addr + | |
813 | (memslot->npages << PAGE_SHIFT)); | |
814 | if (hva_start >= hva_end) | |
815 | continue; | |
816 | /* | |
817 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
818 | * {gfn, gfn+1, ..., gfn_end-1}. | |
819 | */ | |
820 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
821 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
342d3db7 | 822 | |
84504ef3 | 823 | for (; gfn < gfn_end; ++gfn) { |
d19a748b | 824 | gfn_t gfn_offset = gfn - memslot->base_gfn; |
342d3db7 | 825 | |
d89cc617 | 826 | ret = handler(kvm, &memslot->arch.rmap[gfn_offset], gfn); |
342d3db7 PM |
827 | retval |= ret; |
828 | } | |
829 | } | |
830 | ||
831 | return retval; | |
832 | } | |
833 | ||
84504ef3 TY |
834 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
835 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, | |
836 | unsigned long gfn)) | |
837 | { | |
838 | return kvm_handle_hva_range(kvm, hva, hva + 1, handler); | |
839 | } | |
840 | ||
342d3db7 PM |
841 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
842 | unsigned long gfn) | |
843 | { | |
844 | struct revmap_entry *rev = kvm->arch.revmap; | |
845 | unsigned long h, i, j; | |
846 | unsigned long *hptep; | |
bad3b507 | 847 | unsigned long ptel, psize, rcbits; |
342d3db7 PM |
848 | |
849 | for (;;) { | |
bad3b507 | 850 | lock_rmap(rmapp); |
342d3db7 | 851 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
bad3b507 | 852 | unlock_rmap(rmapp); |
342d3db7 PM |
853 | break; |
854 | } | |
855 | ||
856 | /* | |
857 | * To avoid an ABBA deadlock with the HPTE lock bit, | |
bad3b507 PM |
858 | * we can't spin on the HPTE lock while holding the |
859 | * rmap chain lock. | |
342d3db7 PM |
860 | */ |
861 | i = *rmapp & KVMPPC_RMAP_INDEX; | |
bad3b507 PM |
862 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); |
863 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
864 | /* unlock rmap before spinning on the HPTE lock */ | |
865 | unlock_rmap(rmapp); | |
866 | while (hptep[0] & HPTE_V_HVLOCK) | |
867 | cpu_relax(); | |
868 | continue; | |
869 | } | |
342d3db7 PM |
870 | j = rev[i].forw; |
871 | if (j == i) { | |
872 | /* chain is now empty */ | |
bad3b507 | 873 | *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); |
342d3db7 PM |
874 | } else { |
875 | /* remove i from chain */ | |
876 | h = rev[i].back; | |
877 | rev[h].forw = j; | |
878 | rev[j].back = h; | |
879 | rev[i].forw = rev[i].back = i; | |
bad3b507 | 880 | *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; |
342d3db7 | 881 | } |
342d3db7 | 882 | |
bad3b507 | 883 | /* Now check and modify the HPTE */ |
342d3db7 PM |
884 | ptel = rev[i].guest_rpte; |
885 | psize = hpte_page_size(hptep[0], ptel); | |
886 | if ((hptep[0] & HPTE_V_VALID) && | |
887 | hpte_rpn(ptel, psize) == gfn) { | |
dfe49dbd PM |
888 | if (kvm->arch.using_mmu_notifiers) |
889 | hptep[0] |= HPTE_V_ABSENT; | |
bad3b507 PM |
890 | kvmppc_invalidate_hpte(kvm, hptep, i); |
891 | /* Harvest R and C */ | |
892 | rcbits = hptep[1] & (HPTE_R_R | HPTE_R_C); | |
893 | *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; | |
a1b4a0f6 PM |
894 | if (rcbits & ~rev[i].guest_rpte) { |
895 | rev[i].guest_rpte = ptel | rcbits; | |
896 | note_hpte_modification(kvm, &rev[i]); | |
897 | } | |
342d3db7 | 898 | } |
bad3b507 | 899 | unlock_rmap(rmapp); |
342d3db7 PM |
900 | hptep[0] &= ~HPTE_V_HVLOCK; |
901 | } | |
902 | return 0; | |
903 | } | |
904 | ||
3a167bea | 905 | int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 PM |
906 | { |
907 | if (kvm->arch.using_mmu_notifiers) | |
908 | kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); | |
909 | return 0; | |
910 | } | |
911 | ||
3a167bea | 912 | int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end) |
b3ae2096 TY |
913 | { |
914 | if (kvm->arch.using_mmu_notifiers) | |
915 | kvm_handle_hva_range(kvm, start, end, kvm_unmap_rmapp); | |
916 | return 0; | |
917 | } | |
918 | ||
3a167bea AK |
919 | void kvmppc_core_flush_memslot_hv(struct kvm *kvm, |
920 | struct kvm_memory_slot *memslot) | |
dfe49dbd PM |
921 | { |
922 | unsigned long *rmapp; | |
923 | unsigned long gfn; | |
924 | unsigned long n; | |
925 | ||
926 | rmapp = memslot->arch.rmap; | |
927 | gfn = memslot->base_gfn; | |
928 | for (n = memslot->npages; n; --n) { | |
929 | /* | |
930 | * Testing the present bit without locking is OK because | |
931 | * the memslot has been marked invalid already, and hence | |
932 | * no new HPTEs referencing this page can be created, | |
933 | * thus the present bit can't go from 0 to 1. | |
934 | */ | |
935 | if (*rmapp & KVMPPC_RMAP_PRESENT) | |
936 | kvm_unmap_rmapp(kvm, rmapp, gfn); | |
937 | ++rmapp; | |
938 | ++gfn; | |
939 | } | |
940 | } | |
941 | ||
342d3db7 PM |
942 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
943 | unsigned long gfn) | |
944 | { | |
55514893 PM |
945 | struct revmap_entry *rev = kvm->arch.revmap; |
946 | unsigned long head, i, j; | |
947 | unsigned long *hptep; | |
948 | int ret = 0; | |
949 | ||
950 | retry: | |
951 | lock_rmap(rmapp); | |
952 | if (*rmapp & KVMPPC_RMAP_REFERENCED) { | |
953 | *rmapp &= ~KVMPPC_RMAP_REFERENCED; | |
954 | ret = 1; | |
955 | } | |
956 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
957 | unlock_rmap(rmapp); | |
958 | return ret; | |
959 | } | |
960 | ||
961 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
962 | do { | |
963 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); | |
964 | j = rev[i].forw; | |
965 | ||
966 | /* If this HPTE isn't referenced, ignore it */ | |
967 | if (!(hptep[1] & HPTE_R_R)) | |
968 | continue; | |
969 | ||
970 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
971 | /* unlock rmap before spinning on the HPTE lock */ | |
972 | unlock_rmap(rmapp); | |
973 | while (hptep[0] & HPTE_V_HVLOCK) | |
974 | cpu_relax(); | |
975 | goto retry; | |
976 | } | |
977 | ||
978 | /* Now check and modify the HPTE */ | |
979 | if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_R)) { | |
980 | kvmppc_clear_ref_hpte(kvm, hptep, i); | |
a1b4a0f6 PM |
981 | if (!(rev[i].guest_rpte & HPTE_R_R)) { |
982 | rev[i].guest_rpte |= HPTE_R_R; | |
983 | note_hpte_modification(kvm, &rev[i]); | |
984 | } | |
55514893 PM |
985 | ret = 1; |
986 | } | |
987 | hptep[0] &= ~HPTE_V_HVLOCK; | |
988 | } while ((i = j) != head); | |
989 | ||
990 | unlock_rmap(rmapp); | |
991 | return ret; | |
342d3db7 PM |
992 | } |
993 | ||
3a167bea | 994 | int kvm_age_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 PM |
995 | { |
996 | if (!kvm->arch.using_mmu_notifiers) | |
997 | return 0; | |
998 | return kvm_handle_hva(kvm, hva, kvm_age_rmapp); | |
999 | } | |
1000 | ||
1001 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, | |
1002 | unsigned long gfn) | |
1003 | { | |
55514893 PM |
1004 | struct revmap_entry *rev = kvm->arch.revmap; |
1005 | unsigned long head, i, j; | |
1006 | unsigned long *hp; | |
1007 | int ret = 1; | |
1008 | ||
1009 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
1010 | return 1; | |
1011 | ||
1012 | lock_rmap(rmapp); | |
1013 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
1014 | goto out; | |
1015 | ||
1016 | if (*rmapp & KVMPPC_RMAP_PRESENT) { | |
1017 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1018 | do { | |
1019 | hp = (unsigned long *)(kvm->arch.hpt_virt + (i << 4)); | |
1020 | j = rev[i].forw; | |
1021 | if (hp[1] & HPTE_R_R) | |
1022 | goto out; | |
1023 | } while ((i = j) != head); | |
1024 | } | |
1025 | ret = 0; | |
1026 | ||
1027 | out: | |
1028 | unlock_rmap(rmapp); | |
1029 | return ret; | |
342d3db7 PM |
1030 | } |
1031 | ||
3a167bea | 1032 | int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 PM |
1033 | { |
1034 | if (!kvm->arch.using_mmu_notifiers) | |
1035 | return 0; | |
1036 | return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp); | |
1037 | } | |
1038 | ||
3a167bea | 1039 | void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte) |
342d3db7 PM |
1040 | { |
1041 | if (!kvm->arch.using_mmu_notifiers) | |
1042 | return; | |
1043 | kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); | |
de56a948 PM |
1044 | } |
1045 | ||
82ed3616 PM |
1046 | static int kvm_test_clear_dirty(struct kvm *kvm, unsigned long *rmapp) |
1047 | { | |
1048 | struct revmap_entry *rev = kvm->arch.revmap; | |
1049 | unsigned long head, i, j; | |
1050 | unsigned long *hptep; | |
1051 | int ret = 0; | |
1052 | ||
1053 | retry: | |
1054 | lock_rmap(rmapp); | |
1055 | if (*rmapp & KVMPPC_RMAP_CHANGED) { | |
1056 | *rmapp &= ~KVMPPC_RMAP_CHANGED; | |
1057 | ret = 1; | |
1058 | } | |
1059 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
1060 | unlock_rmap(rmapp); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1065 | do { | |
1066 | hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); | |
1067 | j = rev[i].forw; | |
1068 | ||
1069 | if (!(hptep[1] & HPTE_R_C)) | |
1070 | continue; | |
1071 | ||
1072 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
1073 | /* unlock rmap before spinning on the HPTE lock */ | |
1074 | unlock_rmap(rmapp); | |
1075 | while (hptep[0] & HPTE_V_HVLOCK) | |
1076 | cpu_relax(); | |
1077 | goto retry; | |
1078 | } | |
1079 | ||
1080 | /* Now check and modify the HPTE */ | |
1081 | if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_C)) { | |
1082 | /* need to make it temporarily absent to clear C */ | |
1083 | hptep[0] |= HPTE_V_ABSENT; | |
1084 | kvmppc_invalidate_hpte(kvm, hptep, i); | |
1085 | hptep[1] &= ~HPTE_R_C; | |
1086 | eieio(); | |
1087 | hptep[0] = (hptep[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
a1b4a0f6 PM |
1088 | if (!(rev[i].guest_rpte & HPTE_R_C)) { |
1089 | rev[i].guest_rpte |= HPTE_R_C; | |
1090 | note_hpte_modification(kvm, &rev[i]); | |
1091 | } | |
82ed3616 PM |
1092 | ret = 1; |
1093 | } | |
1094 | hptep[0] &= ~HPTE_V_HVLOCK; | |
1095 | } while ((i = j) != head); | |
1096 | ||
1097 | unlock_rmap(rmapp); | |
1098 | return ret; | |
1099 | } | |
1100 | ||
c35635ef PM |
1101 | static void harvest_vpa_dirty(struct kvmppc_vpa *vpa, |
1102 | struct kvm_memory_slot *memslot, | |
1103 | unsigned long *map) | |
1104 | { | |
1105 | unsigned long gfn; | |
1106 | ||
1107 | if (!vpa->dirty || !vpa->pinned_addr) | |
1108 | return; | |
1109 | gfn = vpa->gpa >> PAGE_SHIFT; | |
1110 | if (gfn < memslot->base_gfn || | |
1111 | gfn >= memslot->base_gfn + memslot->npages) | |
1112 | return; | |
1113 | ||
1114 | vpa->dirty = false; | |
1115 | if (map) | |
1116 | __set_bit_le(gfn - memslot->base_gfn, map); | |
1117 | } | |
1118 | ||
dfe49dbd PM |
1119 | long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1120 | unsigned long *map) | |
82ed3616 PM |
1121 | { |
1122 | unsigned long i; | |
dfe49dbd | 1123 | unsigned long *rmapp; |
c35635ef | 1124 | struct kvm_vcpu *vcpu; |
82ed3616 PM |
1125 | |
1126 | preempt_disable(); | |
d89cc617 | 1127 | rmapp = memslot->arch.rmap; |
82ed3616 | 1128 | for (i = 0; i < memslot->npages; ++i) { |
dfe49dbd | 1129 | if (kvm_test_clear_dirty(kvm, rmapp) && map) |
82ed3616 PM |
1130 | __set_bit_le(i, map); |
1131 | ++rmapp; | |
1132 | } | |
c35635ef PM |
1133 | |
1134 | /* Harvest dirty bits from VPA and DTL updates */ | |
1135 | /* Note: we never modify the SLB shadow buffer areas */ | |
1136 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1137 | spin_lock(&vcpu->arch.vpa_update_lock); | |
1138 | harvest_vpa_dirty(&vcpu->arch.vpa, memslot, map); | |
1139 | harvest_vpa_dirty(&vcpu->arch.dtl, memslot, map); | |
1140 | spin_unlock(&vcpu->arch.vpa_update_lock); | |
1141 | } | |
82ed3616 PM |
1142 | preempt_enable(); |
1143 | return 0; | |
1144 | } | |
1145 | ||
93e60249 PM |
1146 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
1147 | unsigned long *nb_ret) | |
1148 | { | |
1149 | struct kvm_memory_slot *memslot; | |
1150 | unsigned long gfn = gpa >> PAGE_SHIFT; | |
342d3db7 PM |
1151 | struct page *page, *pages[1]; |
1152 | int npages; | |
c35635ef | 1153 | unsigned long hva, offset; |
da9d1d7f | 1154 | unsigned long pa; |
93e60249 | 1155 | unsigned long *physp; |
2c9097e4 | 1156 | int srcu_idx; |
93e60249 | 1157 | |
2c9097e4 | 1158 | srcu_idx = srcu_read_lock(&kvm->srcu); |
93e60249 PM |
1159 | memslot = gfn_to_memslot(kvm, gfn); |
1160 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) | |
2c9097e4 | 1161 | goto err; |
342d3db7 | 1162 | if (!kvm->arch.using_mmu_notifiers) { |
a66b48c3 | 1163 | physp = memslot->arch.slot_phys; |
342d3db7 | 1164 | if (!physp) |
2c9097e4 | 1165 | goto err; |
342d3db7 | 1166 | physp += gfn - memslot->base_gfn; |
c77162de | 1167 | pa = *physp; |
342d3db7 PM |
1168 | if (!pa) { |
1169 | if (kvmppc_get_guest_page(kvm, gfn, memslot, | |
1170 | PAGE_SIZE) < 0) | |
2c9097e4 | 1171 | goto err; |
342d3db7 PM |
1172 | pa = *physp; |
1173 | } | |
1174 | page = pfn_to_page(pa >> PAGE_SHIFT); | |
de6c0b02 | 1175 | get_page(page); |
342d3db7 PM |
1176 | } else { |
1177 | hva = gfn_to_hva_memslot(memslot, gfn); | |
1178 | npages = get_user_pages_fast(hva, 1, 1, pages); | |
1179 | if (npages < 1) | |
2c9097e4 | 1180 | goto err; |
342d3db7 | 1181 | page = pages[0]; |
c77162de | 1182 | } |
2c9097e4 PM |
1183 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
1184 | ||
c35635ef | 1185 | offset = gpa & (PAGE_SIZE - 1); |
93e60249 | 1186 | if (nb_ret) |
c35635ef | 1187 | *nb_ret = PAGE_SIZE - offset; |
93e60249 | 1188 | return page_address(page) + offset; |
2c9097e4 PM |
1189 | |
1190 | err: | |
1191 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1192 | return NULL; | |
93e60249 PM |
1193 | } |
1194 | ||
c35635ef PM |
1195 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, |
1196 | bool dirty) | |
93e60249 PM |
1197 | { |
1198 | struct page *page = virt_to_page(va); | |
c35635ef PM |
1199 | struct kvm_memory_slot *memslot; |
1200 | unsigned long gfn; | |
1201 | unsigned long *rmap; | |
1202 | int srcu_idx; | |
93e60249 | 1203 | |
93e60249 | 1204 | put_page(page); |
c35635ef PM |
1205 | |
1206 | if (!dirty || !kvm->arch.using_mmu_notifiers) | |
1207 | return; | |
1208 | ||
1209 | /* We need to mark this page dirty in the rmap chain */ | |
1210 | gfn = gpa >> PAGE_SHIFT; | |
1211 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
1212 | memslot = gfn_to_memslot(kvm, gfn); | |
1213 | if (memslot) { | |
1214 | rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1215 | lock_rmap(rmap); | |
1216 | *rmap |= KVMPPC_RMAP_CHANGED; | |
1217 | unlock_rmap(rmap); | |
1218 | } | |
1219 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
93e60249 PM |
1220 | } |
1221 | ||
a2932923 PM |
1222 | /* |
1223 | * Functions for reading and writing the hash table via reads and | |
1224 | * writes on a file descriptor. | |
1225 | * | |
1226 | * Reads return the guest view of the hash table, which has to be | |
1227 | * pieced together from the real hash table and the guest_rpte | |
1228 | * values in the revmap array. | |
1229 | * | |
1230 | * On writes, each HPTE written is considered in turn, and if it | |
1231 | * is valid, it is written to the HPT as if an H_ENTER with the | |
1232 | * exact flag set was done. When the invalid count is non-zero | |
1233 | * in the header written to the stream, the kernel will make | |
1234 | * sure that that many HPTEs are invalid, and invalidate them | |
1235 | * if not. | |
1236 | */ | |
1237 | ||
1238 | struct kvm_htab_ctx { | |
1239 | unsigned long index; | |
1240 | unsigned long flags; | |
1241 | struct kvm *kvm; | |
1242 | int first_pass; | |
1243 | }; | |
1244 | ||
1245 | #define HPTE_SIZE (2 * sizeof(unsigned long)) | |
1246 | ||
a1b4a0f6 PM |
1247 | /* |
1248 | * Returns 1 if this HPT entry has been modified or has pending | |
1249 | * R/C bit changes. | |
1250 | */ | |
1251 | static int hpte_dirty(struct revmap_entry *revp, unsigned long *hptp) | |
1252 | { | |
1253 | unsigned long rcbits_unset; | |
1254 | ||
1255 | if (revp->guest_rpte & HPTE_GR_MODIFIED) | |
1256 | return 1; | |
1257 | ||
1258 | /* Also need to consider changes in reference and changed bits */ | |
1259 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
1260 | if ((hptp[0] & HPTE_V_VALID) && (hptp[1] & rcbits_unset)) | |
1261 | return 1; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
a2932923 PM |
1266 | static long record_hpte(unsigned long flags, unsigned long *hptp, |
1267 | unsigned long *hpte, struct revmap_entry *revp, | |
1268 | int want_valid, int first_pass) | |
1269 | { | |
1270 | unsigned long v, r; | |
a1b4a0f6 | 1271 | unsigned long rcbits_unset; |
a2932923 PM |
1272 | int ok = 1; |
1273 | int valid, dirty; | |
1274 | ||
1275 | /* Unmodified entries are uninteresting except on the first pass */ | |
a1b4a0f6 | 1276 | dirty = hpte_dirty(revp, hptp); |
a2932923 PM |
1277 | if (!first_pass && !dirty) |
1278 | return 0; | |
1279 | ||
1280 | valid = 0; | |
1281 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
1282 | valid = 1; | |
1283 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && | |
1284 | !(hptp[0] & HPTE_V_BOLTED)) | |
1285 | valid = 0; | |
1286 | } | |
1287 | if (valid != want_valid) | |
1288 | return 0; | |
1289 | ||
1290 | v = r = 0; | |
1291 | if (valid || dirty) { | |
1292 | /* lock the HPTE so it's stable and read it */ | |
1293 | preempt_disable(); | |
1294 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
1295 | cpu_relax(); | |
1296 | v = hptp[0]; | |
a1b4a0f6 PM |
1297 | |
1298 | /* re-evaluate valid and dirty from synchronized HPTE value */ | |
1299 | valid = !!(v & HPTE_V_VALID); | |
1300 | dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED); | |
1301 | ||
1302 | /* Harvest R and C into guest view if necessary */ | |
1303 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
1304 | if (valid && (rcbits_unset & hptp[1])) { | |
1305 | revp->guest_rpte |= (hptp[1] & (HPTE_R_R | HPTE_R_C)) | | |
1306 | HPTE_GR_MODIFIED; | |
1307 | dirty = 1; | |
1308 | } | |
1309 | ||
a2932923 PM |
1310 | if (v & HPTE_V_ABSENT) { |
1311 | v &= ~HPTE_V_ABSENT; | |
1312 | v |= HPTE_V_VALID; | |
a1b4a0f6 | 1313 | valid = 1; |
a2932923 | 1314 | } |
a2932923 PM |
1315 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED)) |
1316 | valid = 0; | |
a1b4a0f6 PM |
1317 | |
1318 | r = revp->guest_rpte; | |
a2932923 PM |
1319 | /* only clear modified if this is the right sort of entry */ |
1320 | if (valid == want_valid && dirty) { | |
1321 | r &= ~HPTE_GR_MODIFIED; | |
1322 | revp->guest_rpte = r; | |
1323 | } | |
1324 | asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); | |
1325 | hptp[0] &= ~HPTE_V_HVLOCK; | |
1326 | preempt_enable(); | |
1327 | if (!(valid == want_valid && (first_pass || dirty))) | |
1328 | ok = 0; | |
1329 | } | |
1330 | hpte[0] = v; | |
1331 | hpte[1] = r; | |
1332 | return ok; | |
1333 | } | |
1334 | ||
1335 | static ssize_t kvm_htab_read(struct file *file, char __user *buf, | |
1336 | size_t count, loff_t *ppos) | |
1337 | { | |
1338 | struct kvm_htab_ctx *ctx = file->private_data; | |
1339 | struct kvm *kvm = ctx->kvm; | |
1340 | struct kvm_get_htab_header hdr; | |
1341 | unsigned long *hptp; | |
1342 | struct revmap_entry *revp; | |
1343 | unsigned long i, nb, nw; | |
1344 | unsigned long __user *lbuf; | |
1345 | struct kvm_get_htab_header __user *hptr; | |
1346 | unsigned long flags; | |
1347 | int first_pass; | |
1348 | unsigned long hpte[2]; | |
1349 | ||
1350 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
1351 | return -EFAULT; | |
1352 | ||
1353 | first_pass = ctx->first_pass; | |
1354 | flags = ctx->flags; | |
1355 | ||
1356 | i = ctx->index; | |
1357 | hptp = (unsigned long *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); | |
1358 | revp = kvm->arch.revmap + i; | |
1359 | lbuf = (unsigned long __user *)buf; | |
1360 | ||
1361 | nb = 0; | |
1362 | while (nb + sizeof(hdr) + HPTE_SIZE < count) { | |
1363 | /* Initialize header */ | |
1364 | hptr = (struct kvm_get_htab_header __user *)buf; | |
a2932923 PM |
1365 | hdr.n_valid = 0; |
1366 | hdr.n_invalid = 0; | |
1367 | nw = nb; | |
1368 | nb += sizeof(hdr); | |
1369 | lbuf = (unsigned long __user *)(buf + sizeof(hdr)); | |
1370 | ||
1371 | /* Skip uninteresting entries, i.e. clean on not-first pass */ | |
1372 | if (!first_pass) { | |
1373 | while (i < kvm->arch.hpt_npte && | |
a1b4a0f6 | 1374 | !hpte_dirty(revp, hptp)) { |
a2932923 PM |
1375 | ++i; |
1376 | hptp += 2; | |
1377 | ++revp; | |
1378 | } | |
1379 | } | |
05dd85f7 | 1380 | hdr.index = i; |
a2932923 PM |
1381 | |
1382 | /* Grab a series of valid entries */ | |
1383 | while (i < kvm->arch.hpt_npte && | |
1384 | hdr.n_valid < 0xffff && | |
1385 | nb + HPTE_SIZE < count && | |
1386 | record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { | |
1387 | /* valid entry, write it out */ | |
1388 | ++hdr.n_valid; | |
1389 | if (__put_user(hpte[0], lbuf) || | |
1390 | __put_user(hpte[1], lbuf + 1)) | |
1391 | return -EFAULT; | |
1392 | nb += HPTE_SIZE; | |
1393 | lbuf += 2; | |
1394 | ++i; | |
1395 | hptp += 2; | |
1396 | ++revp; | |
1397 | } | |
1398 | /* Now skip invalid entries while we can */ | |
1399 | while (i < kvm->arch.hpt_npte && | |
1400 | hdr.n_invalid < 0xffff && | |
1401 | record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { | |
1402 | /* found an invalid entry */ | |
1403 | ++hdr.n_invalid; | |
1404 | ++i; | |
1405 | hptp += 2; | |
1406 | ++revp; | |
1407 | } | |
1408 | ||
1409 | if (hdr.n_valid || hdr.n_invalid) { | |
1410 | /* write back the header */ | |
1411 | if (__copy_to_user(hptr, &hdr, sizeof(hdr))) | |
1412 | return -EFAULT; | |
1413 | nw = nb; | |
1414 | buf = (char __user *)lbuf; | |
1415 | } else { | |
1416 | nb = nw; | |
1417 | } | |
1418 | ||
1419 | /* Check if we've wrapped around the hash table */ | |
1420 | if (i >= kvm->arch.hpt_npte) { | |
1421 | i = 0; | |
1422 | ctx->first_pass = 0; | |
1423 | break; | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | ctx->index = i; | |
1428 | ||
1429 | return nb; | |
1430 | } | |
1431 | ||
1432 | static ssize_t kvm_htab_write(struct file *file, const char __user *buf, | |
1433 | size_t count, loff_t *ppos) | |
1434 | { | |
1435 | struct kvm_htab_ctx *ctx = file->private_data; | |
1436 | struct kvm *kvm = ctx->kvm; | |
1437 | struct kvm_get_htab_header hdr; | |
1438 | unsigned long i, j; | |
1439 | unsigned long v, r; | |
1440 | unsigned long __user *lbuf; | |
1441 | unsigned long *hptp; | |
1442 | unsigned long tmp[2]; | |
1443 | ssize_t nb; | |
1444 | long int err, ret; | |
1445 | int rma_setup; | |
1446 | ||
1447 | if (!access_ok(VERIFY_READ, buf, count)) | |
1448 | return -EFAULT; | |
1449 | ||
1450 | /* lock out vcpus from running while we're doing this */ | |
1451 | mutex_lock(&kvm->lock); | |
1452 | rma_setup = kvm->arch.rma_setup_done; | |
1453 | if (rma_setup) { | |
1454 | kvm->arch.rma_setup_done = 0; /* temporarily */ | |
1455 | /* order rma_setup_done vs. vcpus_running */ | |
1456 | smp_mb(); | |
1457 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1458 | kvm->arch.rma_setup_done = 1; | |
1459 | mutex_unlock(&kvm->lock); | |
1460 | return -EBUSY; | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | err = 0; | |
1465 | for (nb = 0; nb + sizeof(hdr) <= count; ) { | |
1466 | err = -EFAULT; | |
1467 | if (__copy_from_user(&hdr, buf, sizeof(hdr))) | |
1468 | break; | |
1469 | ||
1470 | err = 0; | |
1471 | if (nb + hdr.n_valid * HPTE_SIZE > count) | |
1472 | break; | |
1473 | ||
1474 | nb += sizeof(hdr); | |
1475 | buf += sizeof(hdr); | |
1476 | ||
1477 | err = -EINVAL; | |
1478 | i = hdr.index; | |
1479 | if (i >= kvm->arch.hpt_npte || | |
1480 | i + hdr.n_valid + hdr.n_invalid > kvm->arch.hpt_npte) | |
1481 | break; | |
1482 | ||
1483 | hptp = (unsigned long *)(kvm->arch.hpt_virt + (i * HPTE_SIZE)); | |
1484 | lbuf = (unsigned long __user *)buf; | |
1485 | for (j = 0; j < hdr.n_valid; ++j) { | |
1486 | err = -EFAULT; | |
1487 | if (__get_user(v, lbuf) || __get_user(r, lbuf + 1)) | |
1488 | goto out; | |
1489 | err = -EINVAL; | |
1490 | if (!(v & HPTE_V_VALID)) | |
1491 | goto out; | |
1492 | lbuf += 2; | |
1493 | nb += HPTE_SIZE; | |
1494 | ||
1495 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) | |
1496 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); | |
1497 | err = -EIO; | |
1498 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r, | |
1499 | tmp); | |
1500 | if (ret != H_SUCCESS) { | |
1501 | pr_err("kvm_htab_write ret %ld i=%ld v=%lx " | |
1502 | "r=%lx\n", ret, i, v, r); | |
1503 | goto out; | |
1504 | } | |
1505 | if (!rma_setup && is_vrma_hpte(v)) { | |
1506 | unsigned long psize = hpte_page_size(v, r); | |
1507 | unsigned long senc = slb_pgsize_encoding(psize); | |
1508 | unsigned long lpcr; | |
1509 | ||
1510 | kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | | |
1511 | (VRMA_VSID << SLB_VSID_SHIFT_1T); | |
a0144e2a PM |
1512 | lpcr = senc << (LPCR_VRMASD_SH - 4); |
1513 | kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); | |
a2932923 PM |
1514 | rma_setup = 1; |
1515 | } | |
1516 | ++i; | |
1517 | hptp += 2; | |
1518 | } | |
1519 | ||
1520 | for (j = 0; j < hdr.n_invalid; ++j) { | |
1521 | if (hptp[0] & (HPTE_V_VALID | HPTE_V_ABSENT)) | |
1522 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); | |
1523 | ++i; | |
1524 | hptp += 2; | |
1525 | } | |
1526 | err = 0; | |
1527 | } | |
1528 | ||
1529 | out: | |
1530 | /* Order HPTE updates vs. rma_setup_done */ | |
1531 | smp_wmb(); | |
1532 | kvm->arch.rma_setup_done = rma_setup; | |
1533 | mutex_unlock(&kvm->lock); | |
1534 | ||
1535 | if (err) | |
1536 | return err; | |
1537 | return nb; | |
1538 | } | |
1539 | ||
1540 | static int kvm_htab_release(struct inode *inode, struct file *filp) | |
1541 | { | |
1542 | struct kvm_htab_ctx *ctx = filp->private_data; | |
1543 | ||
1544 | filp->private_data = NULL; | |
1545 | if (!(ctx->flags & KVM_GET_HTAB_WRITE)) | |
1546 | atomic_dec(&ctx->kvm->arch.hpte_mod_interest); | |
1547 | kvm_put_kvm(ctx->kvm); | |
1548 | kfree(ctx); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
75ef9de1 | 1552 | static const struct file_operations kvm_htab_fops = { |
a2932923 PM |
1553 | .read = kvm_htab_read, |
1554 | .write = kvm_htab_write, | |
1555 | .llseek = default_llseek, | |
1556 | .release = kvm_htab_release, | |
1557 | }; | |
1558 | ||
1559 | int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf) | |
1560 | { | |
1561 | int ret; | |
1562 | struct kvm_htab_ctx *ctx; | |
1563 | int rwflag; | |
1564 | ||
1565 | /* reject flags we don't recognize */ | |
1566 | if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE)) | |
1567 | return -EINVAL; | |
1568 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1569 | if (!ctx) | |
1570 | return -ENOMEM; | |
1571 | kvm_get_kvm(kvm); | |
1572 | ctx->kvm = kvm; | |
1573 | ctx->index = ghf->start_index; | |
1574 | ctx->flags = ghf->flags; | |
1575 | ctx->first_pass = 1; | |
1576 | ||
1577 | rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; | |
2f84d5ea | 1578 | ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC); |
a2932923 PM |
1579 | if (ret < 0) { |
1580 | kvm_put_kvm(kvm); | |
1581 | return ret; | |
1582 | } | |
1583 | ||
1584 | if (rwflag == O_RDONLY) { | |
1585 | mutex_lock(&kvm->slots_lock); | |
1586 | atomic_inc(&kvm->arch.hpte_mod_interest); | |
1587 | /* make sure kvmppc_do_h_enter etc. see the increment */ | |
1588 | synchronize_srcu_expedited(&kvm->srcu); | |
1589 | mutex_unlock(&kvm->slots_lock); | |
1590 | } | |
1591 | ||
1592 | return ret; | |
1593 | } | |
1594 | ||
de56a948 PM |
1595 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
1596 | { | |
1597 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
1598 | ||
9e368f29 PM |
1599 | if (cpu_has_feature(CPU_FTR_ARCH_206)) |
1600 | vcpu->arch.slb_nr = 32; /* POWER7 */ | |
1601 | else | |
1602 | vcpu->arch.slb_nr = 64; | |
de56a948 PM |
1603 | |
1604 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; | |
1605 | mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr; | |
1606 | ||
1607 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
1608 | } |