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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> | |
e23a808b | 30 | #include <linux/debugfs.h> |
de56a948 PM |
31 | |
32 | #include <asm/tlbflush.h> | |
33 | #include <asm/kvm_ppc.h> | |
34 | #include <asm/kvm_book3s.h> | |
f64e8084 | 35 | #include <asm/book3s/64/mmu-hash.h> |
de56a948 PM |
36 | #include <asm/hvcall.h> |
37 | #include <asm/synch.h> | |
38 | #include <asm/ppc-opcode.h> | |
39 | #include <asm/cputable.h> | |
40 | ||
3c78f78a SW |
41 | #include "trace_hv.h" |
42 | ||
5e985969 DG |
43 | //#define DEBUG_RESIZE_HPT 1 |
44 | ||
45 | #ifdef DEBUG_RESIZE_HPT | |
46 | #define resize_hpt_debug(resize, ...) \ | |
47 | do { \ | |
48 | printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \ | |
49 | printk(__VA_ARGS__); \ | |
50 | } while (0) | |
51 | #else | |
52 | #define resize_hpt_debug(resize, ...) \ | |
53 | do { } while (0) | |
54 | #endif | |
55 | ||
7ed661bf PM |
56 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
57 | long pte_index, unsigned long pteh, | |
58 | unsigned long ptel, unsigned long *pte_idx_ret); | |
5e985969 DG |
59 | |
60 | struct kvm_resize_hpt { | |
61 | /* These fields read-only after init */ | |
62 | struct kvm *kvm; | |
63 | struct work_struct work; | |
64 | u32 order; | |
65 | ||
66 | /* These fields protected by kvm->lock */ | |
67 | int error; | |
68 | bool prepare_done; | |
b5baa687 DG |
69 | |
70 | /* Private to the work thread, until prepare_done is true, | |
71 | * then protected by kvm->resize_hpt_sem */ | |
72 | struct kvm_hpt_info hpt; | |
5e985969 DG |
73 | }; |
74 | ||
a64fd707 | 75 | static void kvmppc_rmap_reset(struct kvm *kvm); |
7ed661bf | 76 | |
aae0777f | 77 | int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order) |
de56a948 | 78 | { |
792fc497 | 79 | unsigned long hpt = 0; |
aae0777f | 80 | int cma = 0; |
fa61a4e3 | 81 | struct page *page = NULL; |
aae0777f DG |
82 | struct revmap_entry *rev; |
83 | unsigned long npte; | |
de56a948 | 84 | |
aae0777f DG |
85 | if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER)) |
86 | return -EINVAL; | |
32fad281 | 87 | |
db9a290d | 88 | page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT)); |
792fc497 AK |
89 | if (page) { |
90 | hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page)); | |
02a68d05 | 91 | memset((void *)hpt, 0, (1ul << order)); |
aae0777f | 92 | cma = 1; |
de56a948 | 93 | } |
32fad281 | 94 | |
aae0777f | 95 | if (!hpt) |
dcda9b04 | 96 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_RETRY_MAYFAIL |
aae0777f | 97 | |__GFP_NOWARN, order - PAGE_SHIFT); |
32fad281 PM |
98 | |
99 | if (!hpt) | |
100 | return -ENOMEM; | |
101 | ||
aae0777f DG |
102 | /* HPTEs are 2**4 bytes long */ |
103 | npte = 1ul << (order - 4); | |
a56ee9f8 | 104 | |
8936dda4 | 105 | /* Allocate reverse map array */ |
aae0777f | 106 | rev = vmalloc(sizeof(struct revmap_entry) * npte); |
8936dda4 | 107 | if (!rev) { |
aae0777f DG |
108 | pr_err("kvmppc_allocate_hpt: Couldn't alloc reverse map array\n"); |
109 | if (cma) | |
110 | kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT)); | |
111 | else | |
112 | free_pages(hpt, order - PAGE_SHIFT); | |
113 | return -ENOMEM; | |
8936dda4 | 114 | } |
8936dda4 | 115 | |
aae0777f DG |
116 | info->order = order; |
117 | info->virt = hpt; | |
118 | info->cma = cma; | |
119 | info->rev = rev; | |
de56a948 | 120 | |
de56a948 | 121 | return 0; |
aae0777f | 122 | } |
8936dda4 | 123 | |
aae0777f DG |
124 | void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info) |
125 | { | |
126 | atomic64_set(&kvm->arch.mmio_update, 0); | |
127 | kvm->arch.hpt = *info; | |
128 | kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18); | |
129 | ||
3a4f1760 TH |
130 | pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n", |
131 | info->virt, (long)info->order, kvm->arch.lpid); | |
de56a948 PM |
132 | } |
133 | ||
f98a8bf9 | 134 | long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order) |
32fad281 PM |
135 | { |
136 | long err = -EBUSY; | |
f98a8bf9 | 137 | struct kvm_hpt_info info; |
32fad281 | 138 | |
9e04ba69 PM |
139 | if (kvm_is_radix(kvm)) |
140 | return -EINVAL; | |
141 | ||
32fad281 | 142 | mutex_lock(&kvm->lock); |
31037eca AK |
143 | if (kvm->arch.hpte_setup_done) { |
144 | kvm->arch.hpte_setup_done = 0; | |
145 | /* order hpte_setup_done vs. vcpus_running */ | |
32fad281 PM |
146 | smp_mb(); |
147 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
31037eca | 148 | kvm->arch.hpte_setup_done = 1; |
32fad281 PM |
149 | goto out; |
150 | } | |
151 | } | |
f98a8bf9 DG |
152 | if (kvm->arch.hpt.order == order) { |
153 | /* We already have a suitable HPT */ | |
154 | ||
32fad281 | 155 | /* Set the entire HPT to 0, i.e. invalid HPTEs */ |
3f9d4f5a | 156 | memset((void *)kvm->arch.hpt.virt, 0, 1ul << order); |
a64fd707 PM |
157 | /* |
158 | * Reset all the reverse-mapping chains for all memslots | |
159 | */ | |
160 | kvmppc_rmap_reset(kvm); | |
1b400ba0 PM |
161 | /* Ensure that each vcpu will flush its TLB on next entry. */ |
162 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
32fad281 | 163 | err = 0; |
f98a8bf9 | 164 | goto out; |
32fad281 | 165 | } |
f98a8bf9 | 166 | |
ef427198 | 167 | if (kvm->arch.hpt.virt) { |
f98a8bf9 | 168 | kvmppc_free_hpt(&kvm->arch.hpt); |
ef427198 PM |
169 | kvmppc_rmap_reset(kvm); |
170 | } | |
f98a8bf9 DG |
171 | |
172 | err = kvmppc_allocate_hpt(&info, order); | |
173 | if (err < 0) | |
174 | goto out; | |
175 | kvmppc_set_hpt(kvm, &info); | |
176 | ||
177 | out: | |
32fad281 PM |
178 | mutex_unlock(&kvm->lock); |
179 | return err; | |
180 | } | |
181 | ||
aae0777f | 182 | void kvmppc_free_hpt(struct kvm_hpt_info *info) |
de56a948 | 183 | { |
aae0777f DG |
184 | vfree(info->rev); |
185 | if (info->cma) | |
186 | kvm_free_hpt_cma(virt_to_page(info->virt), | |
187 | 1 << (info->order - PAGE_SHIFT)); | |
188 | else if (info->virt) | |
189 | free_pages(info->virt, info->order - PAGE_SHIFT); | |
190 | info->virt = 0; | |
191 | info->order = 0; | |
de56a948 PM |
192 | } |
193 | ||
da9d1d7f PM |
194 | /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ |
195 | static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize) | |
196 | { | |
197 | return (pgsize > 0x1000) ? HPTE_V_LARGE : 0; | |
198 | } | |
199 | ||
200 | /* Bits in second HPTE dword for pagesize 4k, 64k or 16M */ | |
201 | static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize) | |
202 | { | |
203 | return (pgsize == 0x10000) ? 0x1000 : 0; | |
204 | } | |
205 | ||
206 | void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, | |
207 | unsigned long porder) | |
de56a948 PM |
208 | { |
209 | unsigned long i; | |
b2b2f165 | 210 | unsigned long npages; |
c77162de PM |
211 | unsigned long hp_v, hp_r; |
212 | unsigned long addr, hash; | |
da9d1d7f PM |
213 | unsigned long psize; |
214 | unsigned long hp0, hp1; | |
7ed661bf | 215 | unsigned long idx_ret; |
c77162de | 216 | long ret; |
32fad281 | 217 | struct kvm *kvm = vcpu->kvm; |
de56a948 | 218 | |
da9d1d7f PM |
219 | psize = 1ul << porder; |
220 | npages = memslot->npages >> (porder - PAGE_SHIFT); | |
de56a948 PM |
221 | |
222 | /* VRMA can't be > 1TB */ | |
8936dda4 PM |
223 | if (npages > 1ul << (40 - porder)) |
224 | npages = 1ul << (40 - porder); | |
de56a948 | 225 | /* Can't use more than 1 HPTE per HPTEG */ |
3d089f84 DG |
226 | if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1) |
227 | npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1; | |
de56a948 | 228 | |
da9d1d7f PM |
229 | hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | |
230 | HPTE_V_BOLTED | hpte0_pgsize_encoding(psize); | |
231 | hp1 = hpte1_pgsize_encoding(psize) | | |
232 | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; | |
233 | ||
de56a948 | 234 | for (i = 0; i < npages; ++i) { |
c77162de | 235 | addr = i << porder; |
de56a948 | 236 | /* can't use hpt_hash since va > 64 bits */ |
3d089f84 DG |
237 | hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) |
238 | & kvmppc_hpt_mask(&kvm->arch.hpt); | |
de56a948 PM |
239 | /* |
240 | * We assume that the hash table is empty and no | |
241 | * vcpus are using it at this stage. Since we create | |
242 | * at most one HPTE per HPTEG, we just assume entry 7 | |
243 | * is available and use it. | |
244 | */ | |
8936dda4 | 245 | hash = (hash << 3) + 7; |
da9d1d7f PM |
246 | hp_v = hp0 | ((addr >> 16) & ~0x7fUL); |
247 | hp_r = hp1 | addr; | |
7ed661bf PM |
248 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, hash, hp_v, hp_r, |
249 | &idx_ret); | |
c77162de PM |
250 | if (ret != H_SUCCESS) { |
251 | pr_err("KVM: map_vrma at %lx failed, ret=%ld\n", | |
252 | addr, ret); | |
253 | break; | |
254 | } | |
de56a948 PM |
255 | } |
256 | } | |
257 | ||
258 | int kvmppc_mmu_hv_init(void) | |
259 | { | |
9e368f29 PM |
260 | unsigned long host_lpid, rsvd_lpid; |
261 | ||
262 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
de56a948 | 263 | return -EINVAL; |
9e368f29 | 264 | |
c17b98cf PM |
265 | /* POWER7 has 10-bit LPIDs (12-bit in POWER8) */ |
266 | host_lpid = mfspr(SPRN_LPID); | |
267 | rsvd_lpid = LPID_RSVD; | |
9e368f29 | 268 | |
043cc4d7 SW |
269 | kvmppc_init_lpid(rsvd_lpid + 1); |
270 | ||
271 | kvmppc_claim_lpid(host_lpid); | |
9e368f29 | 272 | /* rsvd_lpid is reserved for use in partition switching */ |
043cc4d7 | 273 | kvmppc_claim_lpid(rsvd_lpid); |
de56a948 PM |
274 | |
275 | return 0; | |
276 | } | |
277 | ||
de56a948 PM |
278 | static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) |
279 | { | |
e4e38121 MN |
280 | unsigned long msr = vcpu->arch.intr_msr; |
281 | ||
282 | /* If transactional, change to suspend mode on IRQ delivery */ | |
283 | if (MSR_TM_TRANSACTIONAL(vcpu->arch.shregs.msr)) | |
284 | msr |= MSR_TS_S; | |
285 | else | |
286 | msr |= vcpu->arch.shregs.msr & MSR_TS_MASK; | |
287 | kvmppc_set_msr(vcpu, msr); | |
de56a948 PM |
288 | } |
289 | ||
025c9511 | 290 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
7ed661bf PM |
291 | long pte_index, unsigned long pteh, |
292 | unsigned long ptel, unsigned long *pte_idx_ret) | |
c77162de | 293 | { |
c77162de PM |
294 | long ret; |
295 | ||
342d3db7 PM |
296 | /* Protect linux PTE lookup from page table destruction */ |
297 | rcu_read_lock_sched(); /* this disables preemption too */ | |
7ed661bf PM |
298 | ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, |
299 | current->mm->pgd, false, pte_idx_ret); | |
342d3db7 | 300 | rcu_read_unlock_sched(); |
c77162de PM |
301 | if (ret == H_TOO_HARD) { |
302 | /* this can't happen */ | |
303 | pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); | |
304 | ret = H_RESOURCE; /* or something */ | |
305 | } | |
306 | return ret; | |
307 | ||
308 | } | |
309 | ||
697d3899 PM |
310 | static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, |
311 | gva_t eaddr) | |
312 | { | |
313 | u64 mask; | |
314 | int i; | |
315 | ||
316 | for (i = 0; i < vcpu->arch.slb_nr; i++) { | |
317 | if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) | |
318 | continue; | |
319 | ||
320 | if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) | |
321 | mask = ESID_MASK_1T; | |
322 | else | |
323 | mask = ESID_MASK; | |
324 | ||
325 | if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) | |
326 | return &vcpu->arch.slb[i]; | |
327 | } | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, | |
332 | unsigned long ea) | |
333 | { | |
334 | unsigned long ra_mask; | |
335 | ||
336 | ra_mask = hpte_page_size(v, r) - 1; | |
337 | return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); | |
338 | } | |
339 | ||
de56a948 | 340 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
93b159b4 | 341 | struct kvmppc_pte *gpte, bool data, bool iswrite) |
de56a948 | 342 | { |
697d3899 PM |
343 | struct kvm *kvm = vcpu->kvm; |
344 | struct kvmppc_slb *slbe; | |
345 | unsigned long slb_v; | |
346 | unsigned long pp, key; | |
abb7c7dd | 347 | unsigned long v, orig_v, gr; |
6f22bd32 | 348 | __be64 *hptep; |
697d3899 PM |
349 | int index; |
350 | int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); | |
351 | ||
352 | /* Get SLB entry */ | |
353 | if (virtmode) { | |
354 | slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); | |
355 | if (!slbe) | |
356 | return -EINVAL; | |
357 | slb_v = slbe->origv; | |
358 | } else { | |
359 | /* real mode access */ | |
360 | slb_v = vcpu->kvm->arch.vrma_slb_v; | |
361 | } | |
362 | ||
91648ec0 | 363 | preempt_disable(); |
697d3899 PM |
364 | /* Find the HPTE in the hash table */ |
365 | index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, | |
366 | HPTE_V_VALID | HPTE_V_ABSENT); | |
91648ec0 | 367 | if (index < 0) { |
368 | preempt_enable(); | |
697d3899 | 369 | return -ENOENT; |
91648ec0 | 370 | } |
3f9d4f5a | 371 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
abb7c7dd PM |
372 | v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
373 | if (cpu_has_feature(CPU_FTR_ARCH_300)) | |
374 | v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1])); | |
3f9d4f5a | 375 | gr = kvm->arch.hpt.rev[index].guest_rpte; |
697d3899 | 376 | |
abb7c7dd | 377 | unlock_hpte(hptep, orig_v); |
91648ec0 | 378 | preempt_enable(); |
697d3899 PM |
379 | |
380 | gpte->eaddr = eaddr; | |
381 | gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); | |
382 | ||
383 | /* Get PP bits and key for permission check */ | |
384 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
385 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
386 | key &= slb_v; | |
387 | ||
388 | /* Calculate permissions */ | |
389 | gpte->may_read = hpte_read_permission(pp, key); | |
390 | gpte->may_write = hpte_write_permission(pp, key); | |
391 | gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); | |
392 | ||
393 | /* Storage key permission check for POWER7 */ | |
c17b98cf | 394 | if (data && virtmode) { |
697d3899 PM |
395 | int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); |
396 | if (amrfield & 1) | |
397 | gpte->may_read = 0; | |
398 | if (amrfield & 2) | |
399 | gpte->may_write = 0; | |
400 | } | |
401 | ||
402 | /* Get the guest physical address */ | |
403 | gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Quick test for whether an instruction is a load or a store. | |
409 | * If the instruction is a load or a store, then this will indicate | |
410 | * which it is, at least on server processors. (Embedded processors | |
411 | * have some external PID instructions that don't follow the rule | |
412 | * embodied here.) If the instruction isn't a load or store, then | |
413 | * this doesn't return anything useful. | |
414 | */ | |
415 | static int instruction_is_store(unsigned int instr) | |
416 | { | |
417 | unsigned int mask; | |
418 | ||
419 | mask = 0x10000000; | |
420 | if ((instr & 0xfc000000) == 0x7c000000) | |
421 | mask = 0x100; /* major opcode 31 */ | |
422 | return (instr & mask) != 0; | |
423 | } | |
424 | ||
5a319350 PM |
425 | int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu, |
426 | unsigned long gpa, gva_t ea, int is_store) | |
697d3899 | 427 | { |
697d3899 | 428 | u32 last_inst; |
697d3899 | 429 | |
51f04726 | 430 | /* |
697d3899 PM |
431 | * If we fail, we just return to the guest and try executing it again. |
432 | */ | |
51f04726 MC |
433 | if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != |
434 | EMULATE_DONE) | |
435 | return RESUME_GUEST; | |
697d3899 PM |
436 | |
437 | /* | |
438 | * WARNING: We do not know for sure whether the instruction we just | |
439 | * read from memory is the same that caused the fault in the first | |
440 | * place. If the instruction we read is neither an load or a store, | |
441 | * then it can't access memory, so we don't need to worry about | |
442 | * enforcing access permissions. So, assuming it is a load or | |
443 | * store, we just check that its direction (load or store) is | |
444 | * consistent with the original fault, since that's what we | |
445 | * checked the access permissions against. If there is a mismatch | |
446 | * we just return and retry the instruction. | |
447 | */ | |
448 | ||
51f04726 | 449 | if (instruction_is_store(last_inst) != !!is_store) |
697d3899 PM |
450 | return RESUME_GUEST; |
451 | ||
452 | /* | |
453 | * Emulated accesses are emulated by looking at the hash for | |
454 | * translation once, then performing the access later. The | |
455 | * translation could be invalidated in the meantime in which | |
456 | * point performing the subsequent memory access on the old | |
457 | * physical address could possibly be a security hole for the | |
458 | * guest (but not the host). | |
459 | * | |
460 | * This is less of an issue for MMIO stores since they aren't | |
461 | * globally visible. It could be an issue for MMIO loads to | |
462 | * a certain extent but we'll ignore it for now. | |
463 | */ | |
464 | ||
465 | vcpu->arch.paddr_accessed = gpa; | |
6020c0f6 | 466 | vcpu->arch.vaddr_accessed = ea; |
697d3899 PM |
467 | return kvmppc_emulate_mmio(run, vcpu); |
468 | } | |
469 | ||
470 | int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
471 | unsigned long ea, unsigned long dsisr) | |
472 | { | |
473 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 | 474 | unsigned long hpte[3], r; |
abb7c7dd | 475 | unsigned long hnow_v, hnow_r; |
6f22bd32 | 476 | __be64 *hptep; |
342d3db7 | 477 | unsigned long mmu_seq, psize, pte_size; |
1066f772 | 478 | unsigned long gpa_base, gfn_base; |
70bddfef | 479 | unsigned long gpa, gfn, hva, pfn; |
697d3899 | 480 | struct kvm_memory_slot *memslot; |
342d3db7 | 481 | unsigned long *rmap; |
697d3899 | 482 | struct revmap_entry *rev; |
342d3db7 PM |
483 | struct page *page, *pages[1]; |
484 | long index, ret, npages; | |
30bda41a | 485 | bool is_ci; |
4cf302bc | 486 | unsigned int writing, write_ok; |
342d3db7 | 487 | struct vm_area_struct *vma; |
bad3b507 | 488 | unsigned long rcbits; |
a56ee9f8 | 489 | long mmio_update; |
697d3899 | 490 | |
5a319350 PM |
491 | if (kvm_is_radix(kvm)) |
492 | return kvmppc_book3s_radix_page_fault(run, vcpu, ea, dsisr); | |
493 | ||
697d3899 PM |
494 | /* |
495 | * Real-mode code has already searched the HPT and found the | |
496 | * entry we're interested in. Lock the entry and check that | |
497 | * it hasn't changed. If it has, just return and re-execute the | |
498 | * instruction. | |
499 | */ | |
500 | if (ea != vcpu->arch.pgfault_addr) | |
501 | return RESUME_GUEST; | |
a56ee9f8 YX |
502 | |
503 | if (vcpu->arch.pgfault_cache) { | |
504 | mmio_update = atomic64_read(&kvm->arch.mmio_update); | |
505 | if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) { | |
506 | r = vcpu->arch.pgfault_cache->rpte; | |
507 | psize = hpte_page_size(vcpu->arch.pgfault_hpte[0], r); | |
508 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); | |
509 | gfn_base = gpa_base >> PAGE_SHIFT; | |
510 | gpa = gpa_base | (ea & (psize - 1)); | |
511 | return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, | |
512 | dsisr & DSISR_ISSTORE); | |
513 | } | |
514 | } | |
697d3899 | 515 | index = vcpu->arch.pgfault_index; |
3f9d4f5a DG |
516 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
517 | rev = &kvm->arch.hpt.rev[index]; | |
697d3899 PM |
518 | preempt_disable(); |
519 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
520 | cpu_relax(); | |
6f22bd32 AG |
521 | hpte[0] = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
522 | hpte[1] = be64_to_cpu(hptep[1]); | |
342d3db7 | 523 | hpte[2] = r = rev->guest_rpte; |
a4bd6eb0 | 524 | unlock_hpte(hptep, hpte[0]); |
697d3899 PM |
525 | preempt_enable(); |
526 | ||
abb7c7dd PM |
527 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
528 | hpte[0] = hpte_new_to_old_v(hpte[0], hpte[1]); | |
529 | hpte[1] = hpte_new_to_old_r(hpte[1]); | |
530 | } | |
697d3899 PM |
531 | if (hpte[0] != vcpu->arch.pgfault_hpte[0] || |
532 | hpte[1] != vcpu->arch.pgfault_hpte[1]) | |
533 | return RESUME_GUEST; | |
534 | ||
535 | /* Translate the logical address and get the page */ | |
342d3db7 | 536 | psize = hpte_page_size(hpte[0], r); |
1066f772 PM |
537 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); |
538 | gfn_base = gpa_base >> PAGE_SHIFT; | |
539 | gpa = gpa_base | (ea & (psize - 1)); | |
70bddfef | 540 | gfn = gpa >> PAGE_SHIFT; |
697d3899 PM |
541 | memslot = gfn_to_memslot(kvm, gfn); |
542 | ||
3c78f78a SW |
543 | trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr); |
544 | ||
697d3899 | 545 | /* No memslot means it's an emulated MMIO region */ |
70bddfef | 546 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
6020c0f6 | 547 | return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, |
697d3899 | 548 | dsisr & DSISR_ISSTORE); |
697d3899 | 549 | |
1066f772 PM |
550 | /* |
551 | * This should never happen, because of the slot_is_aligned() | |
552 | * check in kvmppc_do_h_enter(). | |
553 | */ | |
554 | if (gfn_base < memslot->base_gfn) | |
555 | return -EFAULT; | |
556 | ||
342d3db7 PM |
557 | /* used to check for invalidations in progress */ |
558 | mmu_seq = kvm->mmu_notifier_seq; | |
559 | smp_rmb(); | |
560 | ||
3c78f78a | 561 | ret = -EFAULT; |
30bda41a | 562 | is_ci = false; |
342d3db7 PM |
563 | pfn = 0; |
564 | page = NULL; | |
565 | pte_size = PAGE_SIZE; | |
4cf302bc PM |
566 | writing = (dsisr & DSISR_ISSTORE) != 0; |
567 | /* If writing != 0, then the HPTE must allow writing, if we get here */ | |
568 | write_ok = writing; | |
342d3db7 | 569 | hva = gfn_to_hva_memslot(memslot, gfn); |
4cf302bc | 570 | npages = get_user_pages_fast(hva, 1, writing, pages); |
342d3db7 PM |
571 | if (npages < 1) { |
572 | /* Check if it's an I/O mapping */ | |
573 | down_read(¤t->mm->mmap_sem); | |
574 | vma = find_vma(current->mm, hva); | |
575 | if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end && | |
576 | (vma->vm_flags & VM_PFNMAP)) { | |
577 | pfn = vma->vm_pgoff + | |
578 | ((hva - vma->vm_start) >> PAGE_SHIFT); | |
579 | pte_size = psize; | |
30bda41a | 580 | is_ci = pte_ci(__pte((pgprot_val(vma->vm_page_prot)))); |
4cf302bc | 581 | write_ok = vma->vm_flags & VM_WRITE; |
342d3db7 PM |
582 | } |
583 | up_read(¤t->mm->mmap_sem); | |
584 | if (!pfn) | |
3c78f78a | 585 | goto out_put; |
342d3db7 PM |
586 | } else { |
587 | page = pages[0]; | |
caaa4c80 | 588 | pfn = page_to_pfn(page); |
342d3db7 PM |
589 | if (PageHuge(page)) { |
590 | page = compound_head(page); | |
591 | pte_size <<= compound_order(page); | |
592 | } | |
4cf302bc PM |
593 | /* if the guest wants write access, see if that is OK */ |
594 | if (!writing && hpte_is_writable(r)) { | |
595 | pte_t *ptep, pte; | |
691e95fd | 596 | unsigned long flags; |
4cf302bc PM |
597 | /* |
598 | * We need to protect against page table destruction | |
7d6e7f7f | 599 | * hugepage split and collapse. |
4cf302bc | 600 | */ |
691e95fd | 601 | local_irq_save(flags); |
4cf302bc | 602 | ptep = find_linux_pte_or_hugepte(current->mm->pgd, |
891121e6 | 603 | hva, NULL, NULL); |
db7cb5b9 | 604 | if (ptep) { |
7d6e7f7f | 605 | pte = kvmppc_read_update_linux_pte(ptep, 1); |
d19469e8 | 606 | if (__pte_write(pte)) |
4cf302bc PM |
607 | write_ok = 1; |
608 | } | |
691e95fd | 609 | local_irq_restore(flags); |
4cf302bc | 610 | } |
342d3db7 PM |
611 | } |
612 | ||
342d3db7 PM |
613 | if (psize > pte_size) |
614 | goto out_put; | |
615 | ||
616 | /* Check WIMG vs. the actual page we're accessing */ | |
30bda41a AK |
617 | if (!hpte_cache_flags_ok(r, is_ci)) { |
618 | if (is_ci) | |
3c78f78a | 619 | goto out_put; |
342d3db7 PM |
620 | /* |
621 | * Allow guest to map emulated device memory as | |
622 | * uncacheable, but actually make it cacheable. | |
623 | */ | |
624 | r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; | |
625 | } | |
626 | ||
caaa4c80 PM |
627 | /* |
628 | * Set the HPTE to point to pfn. | |
629 | * Since the pfn is at PAGE_SIZE granularity, make sure we | |
630 | * don't mask out lower-order bits if psize < PAGE_SIZE. | |
631 | */ | |
632 | if (psize < PAGE_SIZE) | |
633 | psize = PAGE_SIZE; | |
f0585982 YX |
634 | r = (r & HPTE_R_KEY_HI) | (r & ~(HPTE_R_PP0 - psize)) | |
635 | ((pfn << PAGE_SHIFT) & ~(psize - 1)); | |
4cf302bc PM |
636 | if (hpte_is_writable(r) && !write_ok) |
637 | r = hpte_make_readonly(r); | |
342d3db7 PM |
638 | ret = RESUME_GUEST; |
639 | preempt_disable(); | |
640 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
641 | cpu_relax(); | |
abb7c7dd PM |
642 | hnow_v = be64_to_cpu(hptep[0]); |
643 | hnow_r = be64_to_cpu(hptep[1]); | |
644 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
645 | hnow_v = hpte_new_to_old_v(hnow_v, hnow_r); | |
646 | hnow_r = hpte_new_to_old_r(hnow_r); | |
647 | } | |
648 | if ((hnow_v & ~HPTE_V_HVLOCK) != hpte[0] || hnow_r != hpte[1] || | |
649 | rev->guest_rpte != hpte[2]) | |
342d3db7 PM |
650 | /* HPTE has been changed under us; let the guest retry */ |
651 | goto out_unlock; | |
652 | hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
653 | ||
1066f772 PM |
654 | /* Always put the HPTE in the rmap chain for the page base address */ |
655 | rmap = &memslot->arch.rmap[gfn_base - memslot->base_gfn]; | |
342d3db7 PM |
656 | lock_rmap(rmap); |
657 | ||
658 | /* Check if we might have been invalidated; let the guest retry if so */ | |
659 | ret = RESUME_GUEST; | |
8ca40a70 | 660 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) { |
342d3db7 PM |
661 | unlock_rmap(rmap); |
662 | goto out_unlock; | |
663 | } | |
4cf302bc | 664 | |
bad3b507 PM |
665 | /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ |
666 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
667 | r &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
668 | ||
6f22bd32 | 669 | if (be64_to_cpu(hptep[0]) & HPTE_V_VALID) { |
4cf302bc PM |
670 | /* HPTE was previously valid, so we need to invalidate it */ |
671 | unlock_rmap(rmap); | |
6f22bd32 | 672 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
4cf302bc | 673 | kvmppc_invalidate_hpte(kvm, hptep, index); |
bad3b507 | 674 | /* don't lose previous R and C bits */ |
6f22bd32 | 675 | r |= be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); |
4cf302bc PM |
676 | } else { |
677 | kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); | |
678 | } | |
342d3db7 | 679 | |
abb7c7dd PM |
680 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
681 | r = hpte_old_to_new_r(hpte[0], r); | |
682 | hpte[0] = hpte_old_to_new_v(hpte[0]); | |
683 | } | |
6f22bd32 | 684 | hptep[1] = cpu_to_be64(r); |
342d3db7 | 685 | eieio(); |
a4bd6eb0 | 686 | __unlock_hpte(hptep, hpte[0]); |
342d3db7 PM |
687 | asm volatile("ptesync" : : : "memory"); |
688 | preempt_enable(); | |
4cf302bc | 689 | if (page && hpte_is_writable(r)) |
342d3db7 PM |
690 | SetPageDirty(page); |
691 | ||
692 | out_put: | |
3c78f78a SW |
693 | trace_kvm_page_fault_exit(vcpu, hpte, ret); |
694 | ||
de6c0b02 DG |
695 | if (page) { |
696 | /* | |
697 | * We drop pages[0] here, not page because page might | |
698 | * have been set to the head page of a compound, but | |
699 | * we have to drop the reference on the correct tail | |
700 | * page to match the get inside gup() | |
701 | */ | |
702 | put_page(pages[0]); | |
703 | } | |
342d3db7 PM |
704 | return ret; |
705 | ||
706 | out_unlock: | |
a4bd6eb0 | 707 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 PM |
708 | preempt_enable(); |
709 | goto out_put; | |
710 | } | |
711 | ||
a64fd707 PM |
712 | static void kvmppc_rmap_reset(struct kvm *kvm) |
713 | { | |
714 | struct kvm_memslots *slots; | |
715 | struct kvm_memory_slot *memslot; | |
716 | int srcu_idx; | |
717 | ||
718 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
9f6b8029 | 719 | slots = kvm_memslots(kvm); |
a64fd707 PM |
720 | kvm_for_each_memslot(memslot, slots) { |
721 | /* | |
722 | * This assumes it is acceptable to lose reference and | |
723 | * change bits across a reset. | |
724 | */ | |
725 | memset(memslot->arch.rmap, 0, | |
726 | memslot->npages * sizeof(*memslot->arch.rmap)); | |
727 | } | |
728 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
729 | } | |
730 | ||
01756099 PM |
731 | typedef int (*hva_handler_fn)(struct kvm *kvm, struct kvm_memory_slot *memslot, |
732 | unsigned long gfn); | |
733 | ||
84504ef3 TY |
734 | static int kvm_handle_hva_range(struct kvm *kvm, |
735 | unsigned long start, | |
736 | unsigned long end, | |
01756099 | 737 | hva_handler_fn handler) |
342d3db7 PM |
738 | { |
739 | int ret; | |
740 | int retval = 0; | |
741 | struct kvm_memslots *slots; | |
742 | struct kvm_memory_slot *memslot; | |
743 | ||
744 | slots = kvm_memslots(kvm); | |
745 | kvm_for_each_memslot(memslot, slots) { | |
84504ef3 TY |
746 | unsigned long hva_start, hva_end; |
747 | gfn_t gfn, gfn_end; | |
748 | ||
749 | hva_start = max(start, memslot->userspace_addr); | |
750 | hva_end = min(end, memslot->userspace_addr + | |
751 | (memslot->npages << PAGE_SHIFT)); | |
752 | if (hva_start >= hva_end) | |
753 | continue; | |
754 | /* | |
755 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
756 | * {gfn, gfn+1, ..., gfn_end-1}. | |
757 | */ | |
758 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
759 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
342d3db7 | 760 | |
84504ef3 | 761 | for (; gfn < gfn_end; ++gfn) { |
01756099 | 762 | ret = handler(kvm, memslot, gfn); |
342d3db7 PM |
763 | retval |= ret; |
764 | } | |
765 | } | |
766 | ||
767 | return retval; | |
768 | } | |
769 | ||
84504ef3 | 770 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
01756099 | 771 | hva_handler_fn handler) |
84504ef3 TY |
772 | { |
773 | return kvm_handle_hva_range(kvm, hva, hva + 1, handler); | |
774 | } | |
775 | ||
639e4597 DG |
776 | /* Must be called with both HPTE and rmap locked */ |
777 | static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i, | |
778 | unsigned long *rmapp, unsigned long gfn) | |
779 | { | |
780 | __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); | |
781 | struct revmap_entry *rev = kvm->arch.hpt.rev; | |
782 | unsigned long j, h; | |
783 | unsigned long ptel, psize, rcbits; | |
784 | ||
785 | j = rev[i].forw; | |
786 | if (j == i) { | |
787 | /* chain is now empty */ | |
788 | *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); | |
789 | } else { | |
790 | /* remove i from chain */ | |
791 | h = rev[i].back; | |
792 | rev[h].forw = j; | |
793 | rev[j].back = h; | |
794 | rev[i].forw = rev[i].back = i; | |
795 | *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; | |
796 | } | |
797 | ||
798 | /* Now check and modify the HPTE */ | |
799 | ptel = rev[i].guest_rpte; | |
800 | psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel); | |
801 | if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && | |
802 | hpte_rpn(ptel, psize) == gfn) { | |
803 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); | |
804 | kvmppc_invalidate_hpte(kvm, hptep, i); | |
805 | hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO); | |
806 | /* Harvest R and C */ | |
807 | rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); | |
808 | *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; | |
809 | if (rcbits & HPTE_R_C) | |
810 | kvmppc_update_rmap_change(rmapp, psize); | |
811 | if (rcbits & ~rev[i].guest_rpte) { | |
812 | rev[i].guest_rpte = ptel | rcbits; | |
813 | note_hpte_modification(kvm, &rev[i]); | |
814 | } | |
815 | } | |
816 | } | |
817 | ||
01756099 | 818 | static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
819 | unsigned long gfn) |
820 | { | |
639e4597 | 821 | unsigned long i; |
6f22bd32 | 822 | __be64 *hptep; |
01756099 | 823 | unsigned long *rmapp; |
342d3db7 | 824 | |
01756099 | 825 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
342d3db7 | 826 | for (;;) { |
bad3b507 | 827 | lock_rmap(rmapp); |
342d3db7 | 828 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
bad3b507 | 829 | unlock_rmap(rmapp); |
342d3db7 PM |
830 | break; |
831 | } | |
832 | ||
833 | /* | |
834 | * To avoid an ABBA deadlock with the HPTE lock bit, | |
bad3b507 PM |
835 | * we can't spin on the HPTE lock while holding the |
836 | * rmap chain lock. | |
342d3db7 PM |
837 | */ |
838 | i = *rmapp & KVMPPC_RMAP_INDEX; | |
3f9d4f5a | 839 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
bad3b507 PM |
840 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { |
841 | /* unlock rmap before spinning on the HPTE lock */ | |
842 | unlock_rmap(rmapp); | |
6f22bd32 | 843 | while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK) |
bad3b507 PM |
844 | cpu_relax(); |
845 | continue; | |
846 | } | |
342d3db7 | 847 | |
639e4597 | 848 | kvmppc_unmap_hpte(kvm, i, rmapp, gfn); |
bad3b507 | 849 | unlock_rmap(rmapp); |
a4bd6eb0 | 850 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 PM |
851 | } |
852 | return 0; | |
853 | } | |
854 | ||
3a167bea | 855 | int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 | 856 | { |
01756099 PM |
857 | hva_handler_fn handler; |
858 | ||
859 | handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp; | |
860 | kvm_handle_hva(kvm, hva, handler); | |
342d3db7 PM |
861 | return 0; |
862 | } | |
863 | ||
3a167bea | 864 | int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end) |
b3ae2096 | 865 | { |
01756099 PM |
866 | hva_handler_fn handler; |
867 | ||
868 | handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp; | |
869 | kvm_handle_hva_range(kvm, start, end, handler); | |
b3ae2096 TY |
870 | return 0; |
871 | } | |
872 | ||
3a167bea AK |
873 | void kvmppc_core_flush_memslot_hv(struct kvm *kvm, |
874 | struct kvm_memory_slot *memslot) | |
dfe49dbd | 875 | { |
dfe49dbd PM |
876 | unsigned long gfn; |
877 | unsigned long n; | |
01756099 | 878 | unsigned long *rmapp; |
dfe49dbd | 879 | |
dfe49dbd | 880 | gfn = memslot->base_gfn; |
01756099 PM |
881 | rmapp = memslot->arch.rmap; |
882 | for (n = memslot->npages; n; --n, ++gfn) { | |
883 | if (kvm_is_radix(kvm)) { | |
884 | kvm_unmap_radix(kvm, memslot, gfn); | |
885 | continue; | |
886 | } | |
dfe49dbd PM |
887 | /* |
888 | * Testing the present bit without locking is OK because | |
889 | * the memslot has been marked invalid already, and hence | |
890 | * no new HPTEs referencing this page can be created, | |
891 | * thus the present bit can't go from 0 to 1. | |
892 | */ | |
893 | if (*rmapp & KVMPPC_RMAP_PRESENT) | |
01756099 | 894 | kvm_unmap_rmapp(kvm, memslot, gfn); |
dfe49dbd | 895 | ++rmapp; |
dfe49dbd PM |
896 | } |
897 | } | |
898 | ||
01756099 | 899 | static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
900 | unsigned long gfn) |
901 | { | |
3f9d4f5a | 902 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 | 903 | unsigned long head, i, j; |
6f22bd32 | 904 | __be64 *hptep; |
55514893 | 905 | int ret = 0; |
01756099 | 906 | unsigned long *rmapp; |
55514893 | 907 | |
01756099 | 908 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
55514893 PM |
909 | retry: |
910 | lock_rmap(rmapp); | |
911 | if (*rmapp & KVMPPC_RMAP_REFERENCED) { | |
912 | *rmapp &= ~KVMPPC_RMAP_REFERENCED; | |
913 | ret = 1; | |
914 | } | |
915 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
916 | unlock_rmap(rmapp); | |
917 | return ret; | |
918 | } | |
919 | ||
920 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
921 | do { | |
3f9d4f5a | 922 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
55514893 PM |
923 | j = rev[i].forw; |
924 | ||
925 | /* If this HPTE isn't referenced, ignore it */ | |
6f22bd32 | 926 | if (!(be64_to_cpu(hptep[1]) & HPTE_R_R)) |
55514893 PM |
927 | continue; |
928 | ||
929 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
930 | /* unlock rmap before spinning on the HPTE lock */ | |
931 | unlock_rmap(rmapp); | |
6f22bd32 | 932 | while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK) |
55514893 PM |
933 | cpu_relax(); |
934 | goto retry; | |
935 | } | |
936 | ||
937 | /* Now check and modify the HPTE */ | |
6f22bd32 AG |
938 | if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && |
939 | (be64_to_cpu(hptep[1]) & HPTE_R_R)) { | |
55514893 | 940 | kvmppc_clear_ref_hpte(kvm, hptep, i); |
a1b4a0f6 PM |
941 | if (!(rev[i].guest_rpte & HPTE_R_R)) { |
942 | rev[i].guest_rpte |= HPTE_R_R; | |
943 | note_hpte_modification(kvm, &rev[i]); | |
944 | } | |
55514893 PM |
945 | ret = 1; |
946 | } | |
a4bd6eb0 | 947 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
55514893 PM |
948 | } while ((i = j) != head); |
949 | ||
950 | unlock_rmap(rmapp); | |
951 | return ret; | |
342d3db7 PM |
952 | } |
953 | ||
57128468 | 954 | int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end) |
342d3db7 | 955 | { |
01756099 PM |
956 | hva_handler_fn handler; |
957 | ||
958 | handler = kvm_is_radix(kvm) ? kvm_age_radix : kvm_age_rmapp; | |
959 | return kvm_handle_hva_range(kvm, start, end, handler); | |
342d3db7 PM |
960 | } |
961 | ||
01756099 | 962 | static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
963 | unsigned long gfn) |
964 | { | |
3f9d4f5a | 965 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 PM |
966 | unsigned long head, i, j; |
967 | unsigned long *hp; | |
968 | int ret = 1; | |
01756099 | 969 | unsigned long *rmapp; |
55514893 | 970 | |
01756099 | 971 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
55514893 PM |
972 | if (*rmapp & KVMPPC_RMAP_REFERENCED) |
973 | return 1; | |
974 | ||
975 | lock_rmap(rmapp); | |
976 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
977 | goto out; | |
978 | ||
979 | if (*rmapp & KVMPPC_RMAP_PRESENT) { | |
980 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
981 | do { | |
3f9d4f5a | 982 | hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4)); |
55514893 | 983 | j = rev[i].forw; |
6f22bd32 | 984 | if (be64_to_cpu(hp[1]) & HPTE_R_R) |
55514893 PM |
985 | goto out; |
986 | } while ((i = j) != head); | |
987 | } | |
988 | ret = 0; | |
989 | ||
990 | out: | |
991 | unlock_rmap(rmapp); | |
992 | return ret; | |
342d3db7 PM |
993 | } |
994 | ||
3a167bea | 995 | int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 | 996 | { |
01756099 PM |
997 | hva_handler_fn handler; |
998 | ||
999 | handler = kvm_is_radix(kvm) ? kvm_test_age_radix : kvm_test_age_rmapp; | |
1000 | return kvm_handle_hva(kvm, hva, handler); | |
342d3db7 PM |
1001 | } |
1002 | ||
3a167bea | 1003 | void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte) |
342d3db7 | 1004 | { |
01756099 PM |
1005 | hva_handler_fn handler; |
1006 | ||
1007 | handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp; | |
1008 | kvm_handle_hva(kvm, hva, handler); | |
de56a948 PM |
1009 | } |
1010 | ||
6c576e74 PM |
1011 | static int vcpus_running(struct kvm *kvm) |
1012 | { | |
1013 | return atomic_read(&kvm->arch.vcpus_running) != 0; | |
1014 | } | |
1015 | ||
687414be AK |
1016 | /* |
1017 | * Returns the number of system pages that are dirty. | |
1018 | * This can be more than 1 if we find a huge-page HPTE. | |
1019 | */ | |
1020 | static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp) | |
82ed3616 | 1021 | { |
3f9d4f5a | 1022 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
82ed3616 | 1023 | unsigned long head, i, j; |
687414be | 1024 | unsigned long n; |
6c576e74 | 1025 | unsigned long v, r; |
6f22bd32 | 1026 | __be64 *hptep; |
687414be | 1027 | int npages_dirty = 0; |
82ed3616 PM |
1028 | |
1029 | retry: | |
1030 | lock_rmap(rmapp); | |
1031 | if (*rmapp & KVMPPC_RMAP_CHANGED) { | |
08fe1e7b PM |
1032 | long change_order = (*rmapp & KVMPPC_RMAP_CHG_ORDER) |
1033 | >> KVMPPC_RMAP_CHG_SHIFT; | |
1034 | *rmapp &= ~(KVMPPC_RMAP_CHANGED | KVMPPC_RMAP_CHG_ORDER); | |
687414be | 1035 | npages_dirty = 1; |
08fe1e7b PM |
1036 | if (change_order > PAGE_SHIFT) |
1037 | npages_dirty = 1ul << (change_order - PAGE_SHIFT); | |
82ed3616 PM |
1038 | } |
1039 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
1040 | unlock_rmap(rmapp); | |
687414be | 1041 | return npages_dirty; |
82ed3616 PM |
1042 | } |
1043 | ||
1044 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1045 | do { | |
6f22bd32 | 1046 | unsigned long hptep1; |
3f9d4f5a | 1047 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
82ed3616 PM |
1048 | j = rev[i].forw; |
1049 | ||
6c576e74 PM |
1050 | /* |
1051 | * Checking the C (changed) bit here is racy since there | |
1052 | * is no guarantee about when the hardware writes it back. | |
1053 | * If the HPTE is not writable then it is stable since the | |
1054 | * page can't be written to, and we would have done a tlbie | |
1055 | * (which forces the hardware to complete any writeback) | |
1056 | * when making the HPTE read-only. | |
1057 | * If vcpus are running then this call is racy anyway | |
1058 | * since the page could get dirtied subsequently, so we | |
1059 | * expect there to be a further call which would pick up | |
1060 | * any delayed C bit writeback. | |
1061 | * Otherwise we need to do the tlbie even if C==0 in | |
1062 | * order to pick up any delayed writeback of C. | |
1063 | */ | |
6f22bd32 AG |
1064 | hptep1 = be64_to_cpu(hptep[1]); |
1065 | if (!(hptep1 & HPTE_R_C) && | |
1066 | (!hpte_is_writable(hptep1) || vcpus_running(kvm))) | |
82ed3616 PM |
1067 | continue; |
1068 | ||
1069 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
1070 | /* unlock rmap before spinning on the HPTE lock */ | |
1071 | unlock_rmap(rmapp); | |
6f22bd32 | 1072 | while (hptep[0] & cpu_to_be64(HPTE_V_HVLOCK)) |
82ed3616 PM |
1073 | cpu_relax(); |
1074 | goto retry; | |
1075 | } | |
1076 | ||
1077 | /* Now check and modify the HPTE */ | |
f6fb9e84 | 1078 | if (!(hptep[0] & cpu_to_be64(HPTE_V_VALID))) { |
a4bd6eb0 | 1079 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
6c576e74 | 1080 | continue; |
f6fb9e84 | 1081 | } |
6c576e74 PM |
1082 | |
1083 | /* need to make it temporarily absent so C is stable */ | |
6f22bd32 | 1084 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
6c576e74 | 1085 | kvmppc_invalidate_hpte(kvm, hptep, i); |
6f22bd32 AG |
1086 | v = be64_to_cpu(hptep[0]); |
1087 | r = be64_to_cpu(hptep[1]); | |
6c576e74 | 1088 | if (r & HPTE_R_C) { |
6f22bd32 | 1089 | hptep[1] = cpu_to_be64(r & ~HPTE_R_C); |
a1b4a0f6 PM |
1090 | if (!(rev[i].guest_rpte & HPTE_R_C)) { |
1091 | rev[i].guest_rpte |= HPTE_R_C; | |
1092 | note_hpte_modification(kvm, &rev[i]); | |
1093 | } | |
6c576e74 | 1094 | n = hpte_page_size(v, r); |
687414be AK |
1095 | n = (n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1096 | if (n > npages_dirty) | |
1097 | npages_dirty = n; | |
6c576e74 | 1098 | eieio(); |
82ed3616 | 1099 | } |
a4bd6eb0 | 1100 | v &= ~HPTE_V_ABSENT; |
6c576e74 | 1101 | v |= HPTE_V_VALID; |
a4bd6eb0 | 1102 | __unlock_hpte(hptep, v); |
82ed3616 PM |
1103 | } while ((i = j) != head); |
1104 | ||
1105 | unlock_rmap(rmapp); | |
687414be | 1106 | return npages_dirty; |
82ed3616 PM |
1107 | } |
1108 | ||
8f7b79b8 | 1109 | void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa, |
c35635ef PM |
1110 | struct kvm_memory_slot *memslot, |
1111 | unsigned long *map) | |
1112 | { | |
1113 | unsigned long gfn; | |
1114 | ||
1115 | if (!vpa->dirty || !vpa->pinned_addr) | |
1116 | return; | |
1117 | gfn = vpa->gpa >> PAGE_SHIFT; | |
1118 | if (gfn < memslot->base_gfn || | |
1119 | gfn >= memslot->base_gfn + memslot->npages) | |
1120 | return; | |
1121 | ||
1122 | vpa->dirty = false; | |
1123 | if (map) | |
1124 | __set_bit_le(gfn - memslot->base_gfn, map); | |
1125 | } | |
1126 | ||
8f7b79b8 PM |
1127 | long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm, |
1128 | struct kvm_memory_slot *memslot, unsigned long *map) | |
82ed3616 | 1129 | { |
687414be | 1130 | unsigned long i, j; |
dfe49dbd | 1131 | unsigned long *rmapp; |
82ed3616 PM |
1132 | |
1133 | preempt_disable(); | |
d89cc617 | 1134 | rmapp = memslot->arch.rmap; |
82ed3616 | 1135 | for (i = 0; i < memslot->npages; ++i) { |
687414be AK |
1136 | int npages = kvm_test_clear_dirty_npages(kvm, rmapp); |
1137 | /* | |
1138 | * Note that if npages > 0 then i must be a multiple of npages, | |
1139 | * since we always put huge-page HPTEs in the rmap chain | |
1140 | * corresponding to their page base address. | |
1141 | */ | |
1142 | if (npages && map) | |
1143 | for (j = i; npages; ++j, --npages) | |
1144 | __set_bit_le(j, map); | |
82ed3616 PM |
1145 | ++rmapp; |
1146 | } | |
1147 | preempt_enable(); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
93e60249 PM |
1151 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
1152 | unsigned long *nb_ret) | |
1153 | { | |
1154 | struct kvm_memory_slot *memslot; | |
1155 | unsigned long gfn = gpa >> PAGE_SHIFT; | |
342d3db7 PM |
1156 | struct page *page, *pages[1]; |
1157 | int npages; | |
c35635ef | 1158 | unsigned long hva, offset; |
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; |
c17b98cf PM |
1165 | hva = gfn_to_hva_memslot(memslot, gfn); |
1166 | npages = get_user_pages_fast(hva, 1, 1, pages); | |
1167 | if (npages < 1) | |
1168 | goto err; | |
1169 | page = pages[0]; | |
2c9097e4 PM |
1170 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
1171 | ||
c35635ef | 1172 | offset = gpa & (PAGE_SIZE - 1); |
93e60249 | 1173 | if (nb_ret) |
c35635ef | 1174 | *nb_ret = PAGE_SIZE - offset; |
93e60249 | 1175 | return page_address(page) + offset; |
2c9097e4 PM |
1176 | |
1177 | err: | |
1178 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1179 | return NULL; | |
93e60249 PM |
1180 | } |
1181 | ||
c35635ef PM |
1182 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, |
1183 | bool dirty) | |
93e60249 PM |
1184 | { |
1185 | struct page *page = virt_to_page(va); | |
c35635ef PM |
1186 | struct kvm_memory_slot *memslot; |
1187 | unsigned long gfn; | |
1188 | unsigned long *rmap; | |
1189 | int srcu_idx; | |
93e60249 | 1190 | |
93e60249 | 1191 | put_page(page); |
c35635ef | 1192 | |
c17b98cf | 1193 | if (!dirty) |
c35635ef PM |
1194 | return; |
1195 | ||
1196 | /* We need to mark this page dirty in the rmap chain */ | |
1197 | gfn = gpa >> PAGE_SHIFT; | |
1198 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
1199 | memslot = gfn_to_memslot(kvm, gfn); | |
1200 | if (memslot) { | |
8f7b79b8 PM |
1201 | if (!kvm_is_radix(kvm)) { |
1202 | rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1203 | lock_rmap(rmap); | |
1204 | *rmap |= KVMPPC_RMAP_CHANGED; | |
1205 | unlock_rmap(rmap); | |
1206 | } else if (memslot->dirty_bitmap) { | |
1207 | mark_page_dirty(kvm, gfn); | |
1208 | } | |
c35635ef PM |
1209 | } |
1210 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
93e60249 PM |
1211 | } |
1212 | ||
5e985969 DG |
1213 | /* |
1214 | * HPT resizing | |
1215 | */ | |
1216 | static int resize_hpt_allocate(struct kvm_resize_hpt *resize) | |
1217 | { | |
b5baa687 DG |
1218 | int rc; |
1219 | ||
1220 | rc = kvmppc_allocate_hpt(&resize->hpt, resize->order); | |
1221 | if (rc < 0) | |
1222 | return rc; | |
1223 | ||
1224 | resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n", | |
1225 | resize->hpt.virt); | |
1226 | ||
5e985969 DG |
1227 | return 0; |
1228 | } | |
1229 | ||
b5baa687 DG |
1230 | static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize, |
1231 | unsigned long idx) | |
1232 | { | |
1233 | struct kvm *kvm = resize->kvm; | |
1234 | struct kvm_hpt_info *old = &kvm->arch.hpt; | |
1235 | struct kvm_hpt_info *new = &resize->hpt; | |
1236 | unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1; | |
1237 | unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1; | |
1238 | __be64 *hptep, *new_hptep; | |
1239 | unsigned long vpte, rpte, guest_rpte; | |
1240 | int ret; | |
1241 | struct revmap_entry *rev; | |
1242 | unsigned long apsize, psize, avpn, pteg, hash; | |
1243 | unsigned long new_idx, new_pteg, replace_vpte; | |
1244 | ||
1245 | hptep = (__be64 *)(old->virt + (idx << 4)); | |
1246 | ||
1247 | /* Guest is stopped, so new HPTEs can't be added or faulted | |
1248 | * in, only unmapped or altered by host actions. So, it's | |
1249 | * safe to check this before we take the HPTE lock */ | |
1250 | vpte = be64_to_cpu(hptep[0]); | |
1251 | if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) | |
1252 | return 0; /* nothing to do */ | |
1253 | ||
1254 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
1255 | cpu_relax(); | |
1256 | ||
1257 | vpte = be64_to_cpu(hptep[0]); | |
1258 | ||
1259 | ret = 0; | |
1260 | if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) | |
1261 | /* Nothing to do */ | |
1262 | goto out; | |
1263 | ||
1264 | /* Unmap */ | |
1265 | rev = &old->rev[idx]; | |
1266 | guest_rpte = rev->guest_rpte; | |
1267 | ||
1268 | ret = -EIO; | |
1269 | apsize = hpte_page_size(vpte, guest_rpte); | |
1270 | if (!apsize) | |
1271 | goto out; | |
1272 | ||
1273 | if (vpte & HPTE_V_VALID) { | |
1274 | unsigned long gfn = hpte_rpn(guest_rpte, apsize); | |
1275 | int srcu_idx = srcu_read_lock(&kvm->srcu); | |
1276 | struct kvm_memory_slot *memslot = | |
1277 | __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1278 | ||
1279 | if (memslot) { | |
1280 | unsigned long *rmapp; | |
1281 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1282 | ||
1283 | lock_rmap(rmapp); | |
1284 | kvmppc_unmap_hpte(kvm, idx, rmapp, gfn); | |
1285 | unlock_rmap(rmapp); | |
1286 | } | |
1287 | ||
1288 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1289 | } | |
1290 | ||
1291 | /* Reload PTE after unmap */ | |
1292 | vpte = be64_to_cpu(hptep[0]); | |
1293 | ||
1294 | BUG_ON(vpte & HPTE_V_VALID); | |
1295 | BUG_ON(!(vpte & HPTE_V_ABSENT)); | |
1296 | ||
1297 | ret = 0; | |
1298 | if (!(vpte & HPTE_V_BOLTED)) | |
1299 | goto out; | |
1300 | ||
1301 | rpte = be64_to_cpu(hptep[1]); | |
1302 | psize = hpte_base_page_size(vpte, rpte); | |
1303 | avpn = HPTE_V_AVPN_VAL(vpte) & ~((psize - 1) >> 23); | |
1304 | pteg = idx / HPTES_PER_GROUP; | |
1305 | if (vpte & HPTE_V_SECONDARY) | |
1306 | pteg = ~pteg; | |
1307 | ||
1308 | if (!(vpte & HPTE_V_1TB_SEG)) { | |
1309 | unsigned long offset, vsid; | |
1310 | ||
1311 | /* We only have 28 - 23 bits of offset in avpn */ | |
1312 | offset = (avpn & 0x1f) << 23; | |
1313 | vsid = avpn >> 5; | |
1314 | /* We can find more bits from the pteg value */ | |
1315 | if (psize < (1ULL << 23)) | |
1316 | offset |= ((vsid ^ pteg) & old_hash_mask) * psize; | |
1317 | ||
1318 | hash = vsid ^ (offset / psize); | |
1319 | } else { | |
1320 | unsigned long offset, vsid; | |
1321 | ||
1322 | /* We only have 40 - 23 bits of seg_off in avpn */ | |
1323 | offset = (avpn & 0x1ffff) << 23; | |
1324 | vsid = avpn >> 17; | |
1325 | if (psize < (1ULL << 23)) | |
1326 | offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) * psize; | |
1327 | ||
1328 | hash = vsid ^ (vsid << 25) ^ (offset / psize); | |
1329 | } | |
1330 | ||
1331 | new_pteg = hash & new_hash_mask; | |
1332 | if (vpte & HPTE_V_SECONDARY) { | |
1333 | BUG_ON(~pteg != (hash & old_hash_mask)); | |
1334 | new_pteg = ~new_pteg; | |
1335 | } else { | |
1336 | BUG_ON(pteg != (hash & old_hash_mask)); | |
1337 | } | |
1338 | ||
1339 | new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP); | |
1340 | new_hptep = (__be64 *)(new->virt + (new_idx << 4)); | |
1341 | ||
1342 | replace_vpte = be64_to_cpu(new_hptep[0]); | |
1343 | ||
1344 | if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
1345 | BUG_ON(new->order >= old->order); | |
1346 | ||
1347 | if (replace_vpte & HPTE_V_BOLTED) { | |
1348 | if (vpte & HPTE_V_BOLTED) | |
1349 | /* Bolted collision, nothing we can do */ | |
1350 | ret = -ENOSPC; | |
1351 | /* Discard the new HPTE */ | |
1352 | goto out; | |
1353 | } | |
1354 | ||
1355 | /* Discard the previous HPTE */ | |
1356 | } | |
1357 | ||
1358 | new_hptep[1] = cpu_to_be64(rpte); | |
1359 | new->rev[new_idx].guest_rpte = guest_rpte; | |
1360 | /* No need for a barrier, since new HPT isn't active */ | |
1361 | new_hptep[0] = cpu_to_be64(vpte); | |
1362 | unlock_hpte(new_hptep, vpte); | |
1363 | ||
1364 | out: | |
1365 | unlock_hpte(hptep, vpte); | |
1366 | return ret; | |
1367 | } | |
1368 | ||
5e985969 DG |
1369 | static int resize_hpt_rehash(struct kvm_resize_hpt *resize) |
1370 | { | |
b5baa687 DG |
1371 | struct kvm *kvm = resize->kvm; |
1372 | unsigned long i; | |
1373 | int rc; | |
1374 | ||
bcd3bb63 PM |
1375 | /* |
1376 | * resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs | |
1377 | * that POWER9 uses, and could well hit a BUG_ON on POWER9. | |
1378 | */ | |
1379 | if (cpu_has_feature(CPU_FTR_ARCH_300)) | |
1380 | return -EIO; | |
b5baa687 DG |
1381 | for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) { |
1382 | rc = resize_hpt_rehash_hpte(resize, i); | |
1383 | if (rc != 0) | |
1384 | return rc; | |
1385 | } | |
1386 | ||
1387 | return 0; | |
5e985969 DG |
1388 | } |
1389 | ||
1390 | static void resize_hpt_pivot(struct kvm_resize_hpt *resize) | |
1391 | { | |
b5baa687 DG |
1392 | struct kvm *kvm = resize->kvm; |
1393 | struct kvm_hpt_info hpt_tmp; | |
1394 | ||
1395 | /* Exchange the pending tables in the resize structure with | |
1396 | * the active tables */ | |
1397 | ||
1398 | resize_hpt_debug(resize, "resize_hpt_pivot()\n"); | |
1399 | ||
1400 | spin_lock(&kvm->mmu_lock); | |
1401 | asm volatile("ptesync" : : : "memory"); | |
1402 | ||
1403 | hpt_tmp = kvm->arch.hpt; | |
1404 | kvmppc_set_hpt(kvm, &resize->hpt); | |
1405 | resize->hpt = hpt_tmp; | |
1406 | ||
1407 | spin_unlock(&kvm->mmu_lock); | |
1408 | ||
1409 | synchronize_srcu_expedited(&kvm->srcu); | |
1410 | ||
1411 | resize_hpt_debug(resize, "resize_hpt_pivot() done\n"); | |
5e985969 DG |
1412 | } |
1413 | ||
1414 | static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize) | |
1415 | { | |
1416 | BUG_ON(kvm->arch.resize_hpt != resize); | |
b5baa687 | 1417 | |
5b73d634 DG |
1418 | if (!resize) |
1419 | return; | |
1420 | ||
b5baa687 DG |
1421 | if (resize->hpt.virt) |
1422 | kvmppc_free_hpt(&resize->hpt); | |
1423 | ||
5e985969 DG |
1424 | kvm->arch.resize_hpt = NULL; |
1425 | kfree(resize); | |
1426 | } | |
1427 | ||
1428 | static void resize_hpt_prepare_work(struct work_struct *work) | |
1429 | { | |
1430 | struct kvm_resize_hpt *resize = container_of(work, | |
1431 | struct kvm_resize_hpt, | |
1432 | work); | |
1433 | struct kvm *kvm = resize->kvm; | |
1434 | int err; | |
1435 | ||
1436 | resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n", | |
1437 | resize->order); | |
1438 | ||
1439 | err = resize_hpt_allocate(resize); | |
1440 | ||
1441 | mutex_lock(&kvm->lock); | |
1442 | ||
1443 | resize->error = err; | |
1444 | resize->prepare_done = true; | |
1445 | ||
1446 | mutex_unlock(&kvm->lock); | |
1447 | } | |
1448 | ||
1449 | long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm, | |
1450 | struct kvm_ppc_resize_hpt *rhpt) | |
1451 | { | |
1452 | unsigned long flags = rhpt->flags; | |
1453 | unsigned long shift = rhpt->shift; | |
1454 | struct kvm_resize_hpt *resize; | |
1455 | int ret; | |
1456 | ||
1457 | if (flags != 0) | |
1458 | return -EINVAL; | |
1459 | ||
1460 | if (shift && ((shift < 18) || (shift > 46))) | |
1461 | return -EINVAL; | |
1462 | ||
1463 | mutex_lock(&kvm->lock); | |
1464 | ||
1465 | resize = kvm->arch.resize_hpt; | |
1466 | ||
1467 | if (resize) { | |
1468 | if (resize->order == shift) { | |
1469 | /* Suitable resize in progress */ | |
1470 | if (resize->prepare_done) { | |
1471 | ret = resize->error; | |
1472 | if (ret != 0) | |
1473 | resize_hpt_release(kvm, resize); | |
1474 | } else { | |
1475 | ret = 100; /* estimated time in ms */ | |
1476 | } | |
1477 | ||
1478 | goto out; | |
1479 | } | |
1480 | ||
1481 | /* not suitable, cancel it */ | |
1482 | resize_hpt_release(kvm, resize); | |
1483 | } | |
1484 | ||
1485 | ret = 0; | |
1486 | if (!shift) | |
1487 | goto out; /* nothing to do */ | |
1488 | ||
1489 | /* start new resize */ | |
1490 | ||
1491 | resize = kzalloc(sizeof(*resize), GFP_KERNEL); | |
abd80dcb DC |
1492 | if (!resize) { |
1493 | ret = -ENOMEM; | |
1494 | goto out; | |
1495 | } | |
5e985969 DG |
1496 | resize->order = shift; |
1497 | resize->kvm = kvm; | |
1498 | INIT_WORK(&resize->work, resize_hpt_prepare_work); | |
1499 | kvm->arch.resize_hpt = resize; | |
1500 | ||
1501 | schedule_work(&resize->work); | |
1502 | ||
1503 | ret = 100; /* estimated time in ms */ | |
1504 | ||
1505 | out: | |
1506 | mutex_unlock(&kvm->lock); | |
1507 | return ret; | |
1508 | } | |
1509 | ||
1510 | static void resize_hpt_boot_vcpu(void *opaque) | |
1511 | { | |
1512 | /* Nothing to do, just force a KVM exit */ | |
1513 | } | |
1514 | ||
1515 | long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, | |
1516 | struct kvm_ppc_resize_hpt *rhpt) | |
1517 | { | |
1518 | unsigned long flags = rhpt->flags; | |
1519 | unsigned long shift = rhpt->shift; | |
1520 | struct kvm_resize_hpt *resize; | |
1521 | long ret; | |
1522 | ||
1523 | if (flags != 0) | |
1524 | return -EINVAL; | |
1525 | ||
1526 | if (shift && ((shift < 18) || (shift > 46))) | |
1527 | return -EINVAL; | |
1528 | ||
1529 | mutex_lock(&kvm->lock); | |
1530 | ||
1531 | resize = kvm->arch.resize_hpt; | |
1532 | ||
1533 | /* This shouldn't be possible */ | |
1534 | ret = -EIO; | |
1535 | if (WARN_ON(!kvm->arch.hpte_setup_done)) | |
1536 | goto out_no_hpt; | |
1537 | ||
1538 | /* Stop VCPUs from running while we mess with the HPT */ | |
1539 | kvm->arch.hpte_setup_done = 0; | |
1540 | smp_mb(); | |
1541 | ||
1542 | /* Boot all CPUs out of the guest so they re-read | |
1543 | * hpte_setup_done */ | |
1544 | on_each_cpu(resize_hpt_boot_vcpu, NULL, 1); | |
1545 | ||
1546 | ret = -ENXIO; | |
1547 | if (!resize || (resize->order != shift)) | |
1548 | goto out; | |
1549 | ||
1550 | ret = -EBUSY; | |
1551 | if (!resize->prepare_done) | |
1552 | goto out; | |
1553 | ||
1554 | ret = resize->error; | |
1555 | if (ret != 0) | |
1556 | goto out; | |
1557 | ||
1558 | ret = resize_hpt_rehash(resize); | |
1559 | if (ret != 0) | |
1560 | goto out; | |
1561 | ||
1562 | resize_hpt_pivot(resize); | |
1563 | ||
1564 | out: | |
1565 | /* Let VCPUs run again */ | |
1566 | kvm->arch.hpte_setup_done = 1; | |
1567 | smp_mb(); | |
1568 | out_no_hpt: | |
1569 | resize_hpt_release(kvm, resize); | |
1570 | mutex_unlock(&kvm->lock); | |
1571 | return ret; | |
1572 | } | |
1573 | ||
a2932923 PM |
1574 | /* |
1575 | * Functions for reading and writing the hash table via reads and | |
1576 | * writes on a file descriptor. | |
1577 | * | |
1578 | * Reads return the guest view of the hash table, which has to be | |
1579 | * pieced together from the real hash table and the guest_rpte | |
1580 | * values in the revmap array. | |
1581 | * | |
1582 | * On writes, each HPTE written is considered in turn, and if it | |
1583 | * is valid, it is written to the HPT as if an H_ENTER with the | |
1584 | * exact flag set was done. When the invalid count is non-zero | |
1585 | * in the header written to the stream, the kernel will make | |
1586 | * sure that that many HPTEs are invalid, and invalidate them | |
1587 | * if not. | |
1588 | */ | |
1589 | ||
1590 | struct kvm_htab_ctx { | |
1591 | unsigned long index; | |
1592 | unsigned long flags; | |
1593 | struct kvm *kvm; | |
1594 | int first_pass; | |
1595 | }; | |
1596 | ||
1597 | #define HPTE_SIZE (2 * sizeof(unsigned long)) | |
1598 | ||
a1b4a0f6 PM |
1599 | /* |
1600 | * Returns 1 if this HPT entry has been modified or has pending | |
1601 | * R/C bit changes. | |
1602 | */ | |
6f22bd32 | 1603 | static int hpte_dirty(struct revmap_entry *revp, __be64 *hptp) |
a1b4a0f6 PM |
1604 | { |
1605 | unsigned long rcbits_unset; | |
1606 | ||
1607 | if (revp->guest_rpte & HPTE_GR_MODIFIED) | |
1608 | return 1; | |
1609 | ||
1610 | /* Also need to consider changes in reference and changed bits */ | |
1611 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
6f22bd32 AG |
1612 | if ((be64_to_cpu(hptp[0]) & HPTE_V_VALID) && |
1613 | (be64_to_cpu(hptp[1]) & rcbits_unset)) | |
a1b4a0f6 PM |
1614 | return 1; |
1615 | ||
1616 | return 0; | |
1617 | } | |
1618 | ||
6f22bd32 | 1619 | static long record_hpte(unsigned long flags, __be64 *hptp, |
a2932923 PM |
1620 | unsigned long *hpte, struct revmap_entry *revp, |
1621 | int want_valid, int first_pass) | |
1622 | { | |
abb7c7dd | 1623 | unsigned long v, r, hr; |
a1b4a0f6 | 1624 | unsigned long rcbits_unset; |
a2932923 PM |
1625 | int ok = 1; |
1626 | int valid, dirty; | |
1627 | ||
1628 | /* Unmodified entries are uninteresting except on the first pass */ | |
a1b4a0f6 | 1629 | dirty = hpte_dirty(revp, hptp); |
a2932923 PM |
1630 | if (!first_pass && !dirty) |
1631 | return 0; | |
1632 | ||
1633 | valid = 0; | |
6f22bd32 | 1634 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
a2932923 PM |
1635 | valid = 1; |
1636 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && | |
6f22bd32 | 1637 | !(be64_to_cpu(hptp[0]) & HPTE_V_BOLTED)) |
a2932923 PM |
1638 | valid = 0; |
1639 | } | |
1640 | if (valid != want_valid) | |
1641 | return 0; | |
1642 | ||
1643 | v = r = 0; | |
1644 | if (valid || dirty) { | |
1645 | /* lock the HPTE so it's stable and read it */ | |
1646 | preempt_disable(); | |
1647 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
1648 | cpu_relax(); | |
6f22bd32 | 1649 | v = be64_to_cpu(hptp[0]); |
abb7c7dd PM |
1650 | hr = be64_to_cpu(hptp[1]); |
1651 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
1652 | v = hpte_new_to_old_v(v, hr); | |
1653 | hr = hpte_new_to_old_r(hr); | |
1654 | } | |
a1b4a0f6 PM |
1655 | |
1656 | /* re-evaluate valid and dirty from synchronized HPTE value */ | |
1657 | valid = !!(v & HPTE_V_VALID); | |
1658 | dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED); | |
1659 | ||
1660 | /* Harvest R and C into guest view if necessary */ | |
1661 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
abb7c7dd PM |
1662 | if (valid && (rcbits_unset & hr)) { |
1663 | revp->guest_rpte |= (hr & | |
6f22bd32 | 1664 | (HPTE_R_R | HPTE_R_C)) | HPTE_GR_MODIFIED; |
a1b4a0f6 PM |
1665 | dirty = 1; |
1666 | } | |
1667 | ||
a2932923 PM |
1668 | if (v & HPTE_V_ABSENT) { |
1669 | v &= ~HPTE_V_ABSENT; | |
1670 | v |= HPTE_V_VALID; | |
a1b4a0f6 | 1671 | valid = 1; |
a2932923 | 1672 | } |
a2932923 PM |
1673 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED)) |
1674 | valid = 0; | |
a1b4a0f6 PM |
1675 | |
1676 | r = revp->guest_rpte; | |
a2932923 PM |
1677 | /* only clear modified if this is the right sort of entry */ |
1678 | if (valid == want_valid && dirty) { | |
1679 | r &= ~HPTE_GR_MODIFIED; | |
1680 | revp->guest_rpte = r; | |
1681 | } | |
a4bd6eb0 | 1682 | unlock_hpte(hptp, be64_to_cpu(hptp[0])); |
a2932923 PM |
1683 | preempt_enable(); |
1684 | if (!(valid == want_valid && (first_pass || dirty))) | |
1685 | ok = 0; | |
1686 | } | |
6f22bd32 AG |
1687 | hpte[0] = cpu_to_be64(v); |
1688 | hpte[1] = cpu_to_be64(r); | |
a2932923 PM |
1689 | return ok; |
1690 | } | |
1691 | ||
1692 | static ssize_t kvm_htab_read(struct file *file, char __user *buf, | |
1693 | size_t count, loff_t *ppos) | |
1694 | { | |
1695 | struct kvm_htab_ctx *ctx = file->private_data; | |
1696 | struct kvm *kvm = ctx->kvm; | |
1697 | struct kvm_get_htab_header hdr; | |
6f22bd32 | 1698 | __be64 *hptp; |
a2932923 PM |
1699 | struct revmap_entry *revp; |
1700 | unsigned long i, nb, nw; | |
1701 | unsigned long __user *lbuf; | |
1702 | struct kvm_get_htab_header __user *hptr; | |
1703 | unsigned long flags; | |
1704 | int first_pass; | |
1705 | unsigned long hpte[2]; | |
1706 | ||
1707 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
1708 | return -EFAULT; | |
1709 | ||
1710 | first_pass = ctx->first_pass; | |
1711 | flags = ctx->flags; | |
1712 | ||
1713 | i = ctx->index; | |
3f9d4f5a DG |
1714 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
1715 | revp = kvm->arch.hpt.rev + i; | |
a2932923 PM |
1716 | lbuf = (unsigned long __user *)buf; |
1717 | ||
1718 | nb = 0; | |
1719 | while (nb + sizeof(hdr) + HPTE_SIZE < count) { | |
1720 | /* Initialize header */ | |
1721 | hptr = (struct kvm_get_htab_header __user *)buf; | |
a2932923 PM |
1722 | hdr.n_valid = 0; |
1723 | hdr.n_invalid = 0; | |
1724 | nw = nb; | |
1725 | nb += sizeof(hdr); | |
1726 | lbuf = (unsigned long __user *)(buf + sizeof(hdr)); | |
1727 | ||
1728 | /* Skip uninteresting entries, i.e. clean on not-first pass */ | |
1729 | if (!first_pass) { | |
3d089f84 | 1730 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a1b4a0f6 | 1731 | !hpte_dirty(revp, hptp)) { |
a2932923 PM |
1732 | ++i; |
1733 | hptp += 2; | |
1734 | ++revp; | |
1735 | } | |
1736 | } | |
05dd85f7 | 1737 | hdr.index = i; |
a2932923 PM |
1738 | |
1739 | /* Grab a series of valid entries */ | |
3d089f84 | 1740 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1741 | hdr.n_valid < 0xffff && |
1742 | nb + HPTE_SIZE < count && | |
1743 | record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { | |
1744 | /* valid entry, write it out */ | |
1745 | ++hdr.n_valid; | |
1746 | if (__put_user(hpte[0], lbuf) || | |
1747 | __put_user(hpte[1], lbuf + 1)) | |
1748 | return -EFAULT; | |
1749 | nb += HPTE_SIZE; | |
1750 | lbuf += 2; | |
1751 | ++i; | |
1752 | hptp += 2; | |
1753 | ++revp; | |
1754 | } | |
1755 | /* Now skip invalid entries while we can */ | |
3d089f84 | 1756 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1757 | hdr.n_invalid < 0xffff && |
1758 | record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { | |
1759 | /* found an invalid entry */ | |
1760 | ++hdr.n_invalid; | |
1761 | ++i; | |
1762 | hptp += 2; | |
1763 | ++revp; | |
1764 | } | |
1765 | ||
1766 | if (hdr.n_valid || hdr.n_invalid) { | |
1767 | /* write back the header */ | |
1768 | if (__copy_to_user(hptr, &hdr, sizeof(hdr))) | |
1769 | return -EFAULT; | |
1770 | nw = nb; | |
1771 | buf = (char __user *)lbuf; | |
1772 | } else { | |
1773 | nb = nw; | |
1774 | } | |
1775 | ||
1776 | /* Check if we've wrapped around the hash table */ | |
3d089f84 | 1777 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) { |
a2932923 PM |
1778 | i = 0; |
1779 | ctx->first_pass = 0; | |
1780 | break; | |
1781 | } | |
1782 | } | |
1783 | ||
1784 | ctx->index = i; | |
1785 | ||
1786 | return nb; | |
1787 | } | |
1788 | ||
1789 | static ssize_t kvm_htab_write(struct file *file, const char __user *buf, | |
1790 | size_t count, loff_t *ppos) | |
1791 | { | |
1792 | struct kvm_htab_ctx *ctx = file->private_data; | |
1793 | struct kvm *kvm = ctx->kvm; | |
1794 | struct kvm_get_htab_header hdr; | |
1795 | unsigned long i, j; | |
1796 | unsigned long v, r; | |
1797 | unsigned long __user *lbuf; | |
6f22bd32 | 1798 | __be64 *hptp; |
a2932923 PM |
1799 | unsigned long tmp[2]; |
1800 | ssize_t nb; | |
1801 | long int err, ret; | |
31037eca | 1802 | int hpte_setup; |
a2932923 PM |
1803 | |
1804 | if (!access_ok(VERIFY_READ, buf, count)) | |
1805 | return -EFAULT; | |
1806 | ||
1807 | /* lock out vcpus from running while we're doing this */ | |
1808 | mutex_lock(&kvm->lock); | |
31037eca AK |
1809 | hpte_setup = kvm->arch.hpte_setup_done; |
1810 | if (hpte_setup) { | |
1811 | kvm->arch.hpte_setup_done = 0; /* temporarily */ | |
1812 | /* order hpte_setup_done vs. vcpus_running */ | |
a2932923 PM |
1813 | smp_mb(); |
1814 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
31037eca | 1815 | kvm->arch.hpte_setup_done = 1; |
a2932923 PM |
1816 | mutex_unlock(&kvm->lock); |
1817 | return -EBUSY; | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | err = 0; | |
1822 | for (nb = 0; nb + sizeof(hdr) <= count; ) { | |
1823 | err = -EFAULT; | |
1824 | if (__copy_from_user(&hdr, buf, sizeof(hdr))) | |
1825 | break; | |
1826 | ||
1827 | err = 0; | |
1828 | if (nb + hdr.n_valid * HPTE_SIZE > count) | |
1829 | break; | |
1830 | ||
1831 | nb += sizeof(hdr); | |
1832 | buf += sizeof(hdr); | |
1833 | ||
1834 | err = -EINVAL; | |
1835 | i = hdr.index; | |
3d089f84 DG |
1836 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) || |
1837 | i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt)) | |
a2932923 PM |
1838 | break; |
1839 | ||
3f9d4f5a | 1840 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
a2932923 PM |
1841 | lbuf = (unsigned long __user *)buf; |
1842 | for (j = 0; j < hdr.n_valid; ++j) { | |
ffada016 CLG |
1843 | __be64 hpte_v; |
1844 | __be64 hpte_r; | |
1845 | ||
a2932923 | 1846 | err = -EFAULT; |
ffada016 CLG |
1847 | if (__get_user(hpte_v, lbuf) || |
1848 | __get_user(hpte_r, lbuf + 1)) | |
a2932923 | 1849 | goto out; |
ffada016 CLG |
1850 | v = be64_to_cpu(hpte_v); |
1851 | r = be64_to_cpu(hpte_r); | |
a2932923 PM |
1852 | err = -EINVAL; |
1853 | if (!(v & HPTE_V_VALID)) | |
1854 | goto out; | |
1855 | lbuf += 2; | |
1856 | nb += HPTE_SIZE; | |
1857 | ||
6f22bd32 | 1858 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1859 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1860 | err = -EIO; | |
1861 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r, | |
1862 | tmp); | |
1863 | if (ret != H_SUCCESS) { | |
1864 | pr_err("kvm_htab_write ret %ld i=%ld v=%lx " | |
1865 | "r=%lx\n", ret, i, v, r); | |
1866 | goto out; | |
1867 | } | |
31037eca | 1868 | if (!hpte_setup && is_vrma_hpte(v)) { |
341acbb3 | 1869 | unsigned long psize = hpte_base_page_size(v, r); |
a2932923 PM |
1870 | unsigned long senc = slb_pgsize_encoding(psize); |
1871 | unsigned long lpcr; | |
1872 | ||
1873 | kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | | |
1874 | (VRMA_VSID << SLB_VSID_SHIFT_1T); | |
a0144e2a PM |
1875 | lpcr = senc << (LPCR_VRMASD_SH - 4); |
1876 | kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); | |
31037eca | 1877 | hpte_setup = 1; |
a2932923 PM |
1878 | } |
1879 | ++i; | |
1880 | hptp += 2; | |
1881 | } | |
1882 | ||
1883 | for (j = 0; j < hdr.n_invalid; ++j) { | |
6f22bd32 | 1884 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1885 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1886 | ++i; | |
1887 | hptp += 2; | |
1888 | } | |
1889 | err = 0; | |
1890 | } | |
1891 | ||
1892 | out: | |
31037eca | 1893 | /* Order HPTE updates vs. hpte_setup_done */ |
a2932923 | 1894 | smp_wmb(); |
31037eca | 1895 | kvm->arch.hpte_setup_done = hpte_setup; |
a2932923 PM |
1896 | mutex_unlock(&kvm->lock); |
1897 | ||
1898 | if (err) | |
1899 | return err; | |
1900 | return nb; | |
1901 | } | |
1902 | ||
1903 | static int kvm_htab_release(struct inode *inode, struct file *filp) | |
1904 | { | |
1905 | struct kvm_htab_ctx *ctx = filp->private_data; | |
1906 | ||
1907 | filp->private_data = NULL; | |
1908 | if (!(ctx->flags & KVM_GET_HTAB_WRITE)) | |
1909 | atomic_dec(&ctx->kvm->arch.hpte_mod_interest); | |
1910 | kvm_put_kvm(ctx->kvm); | |
1911 | kfree(ctx); | |
1912 | return 0; | |
1913 | } | |
1914 | ||
75ef9de1 | 1915 | static const struct file_operations kvm_htab_fops = { |
a2932923 PM |
1916 | .read = kvm_htab_read, |
1917 | .write = kvm_htab_write, | |
1918 | .llseek = default_llseek, | |
1919 | .release = kvm_htab_release, | |
1920 | }; | |
1921 | ||
1922 | int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf) | |
1923 | { | |
1924 | int ret; | |
1925 | struct kvm_htab_ctx *ctx; | |
1926 | int rwflag; | |
1927 | ||
1928 | /* reject flags we don't recognize */ | |
1929 | if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE)) | |
1930 | return -EINVAL; | |
1931 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1932 | if (!ctx) | |
1933 | return -ENOMEM; | |
1934 | kvm_get_kvm(kvm); | |
1935 | ctx->kvm = kvm; | |
1936 | ctx->index = ghf->start_index; | |
1937 | ctx->flags = ghf->flags; | |
1938 | ctx->first_pass = 1; | |
1939 | ||
1940 | rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; | |
2f84d5ea | 1941 | ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC); |
a2932923 PM |
1942 | if (ret < 0) { |
1943 | kvm_put_kvm(kvm); | |
1944 | return ret; | |
1945 | } | |
1946 | ||
1947 | if (rwflag == O_RDONLY) { | |
1948 | mutex_lock(&kvm->slots_lock); | |
1949 | atomic_inc(&kvm->arch.hpte_mod_interest); | |
1950 | /* make sure kvmppc_do_h_enter etc. see the increment */ | |
1951 | synchronize_srcu_expedited(&kvm->srcu); | |
1952 | mutex_unlock(&kvm->slots_lock); | |
1953 | } | |
1954 | ||
1955 | return ret; | |
1956 | } | |
1957 | ||
e23a808b PM |
1958 | struct debugfs_htab_state { |
1959 | struct kvm *kvm; | |
1960 | struct mutex mutex; | |
1961 | unsigned long hpt_index; | |
1962 | int chars_left; | |
1963 | int buf_index; | |
1964 | char buf[64]; | |
1965 | }; | |
1966 | ||
1967 | static int debugfs_htab_open(struct inode *inode, struct file *file) | |
1968 | { | |
1969 | struct kvm *kvm = inode->i_private; | |
1970 | struct debugfs_htab_state *p; | |
1971 | ||
1972 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
1973 | if (!p) | |
1974 | return -ENOMEM; | |
1975 | ||
1976 | kvm_get_kvm(kvm); | |
1977 | p->kvm = kvm; | |
1978 | mutex_init(&p->mutex); | |
1979 | file->private_data = p; | |
1980 | ||
1981 | return nonseekable_open(inode, file); | |
1982 | } | |
1983 | ||
1984 | static int debugfs_htab_release(struct inode *inode, struct file *file) | |
1985 | { | |
1986 | struct debugfs_htab_state *p = file->private_data; | |
1987 | ||
1988 | kvm_put_kvm(p->kvm); | |
1989 | kfree(p); | |
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | static ssize_t debugfs_htab_read(struct file *file, char __user *buf, | |
1994 | size_t len, loff_t *ppos) | |
1995 | { | |
1996 | struct debugfs_htab_state *p = file->private_data; | |
1997 | ssize_t ret, r; | |
1998 | unsigned long i, n; | |
1999 | unsigned long v, hr, gr; | |
2000 | struct kvm *kvm; | |
2001 | __be64 *hptp; | |
2002 | ||
2003 | ret = mutex_lock_interruptible(&p->mutex); | |
2004 | if (ret) | |
2005 | return ret; | |
2006 | ||
2007 | if (p->chars_left) { | |
2008 | n = p->chars_left; | |
2009 | if (n > len) | |
2010 | n = len; | |
2011 | r = copy_to_user(buf, p->buf + p->buf_index, n); | |
2012 | n -= r; | |
2013 | p->chars_left -= n; | |
2014 | p->buf_index += n; | |
2015 | buf += n; | |
2016 | len -= n; | |
2017 | ret = n; | |
2018 | if (r) { | |
2019 | if (!n) | |
2020 | ret = -EFAULT; | |
2021 | goto out; | |
2022 | } | |
2023 | } | |
2024 | ||
2025 | kvm = p->kvm; | |
2026 | i = p->hpt_index; | |
3f9d4f5a | 2027 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
3d089f84 DG |
2028 | for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt); |
2029 | ++i, hptp += 2) { | |
e23a808b PM |
2030 | if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))) |
2031 | continue; | |
2032 | ||
2033 | /* lock the HPTE so it's stable and read it */ | |
2034 | preempt_disable(); | |
2035 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
2036 | cpu_relax(); | |
2037 | v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK; | |
2038 | hr = be64_to_cpu(hptp[1]); | |
3f9d4f5a | 2039 | gr = kvm->arch.hpt.rev[i].guest_rpte; |
e23a808b PM |
2040 | unlock_hpte(hptp, v); |
2041 | preempt_enable(); | |
2042 | ||
2043 | if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT))) | |
2044 | continue; | |
2045 | ||
2046 | n = scnprintf(p->buf, sizeof(p->buf), | |
2047 | "%6lx %.16lx %.16lx %.16lx\n", | |
2048 | i, v, hr, gr); | |
2049 | p->chars_left = n; | |
2050 | if (n > len) | |
2051 | n = len; | |
2052 | r = copy_to_user(buf, p->buf, n); | |
2053 | n -= r; | |
2054 | p->chars_left -= n; | |
2055 | p->buf_index = n; | |
2056 | buf += n; | |
2057 | len -= n; | |
2058 | ret += n; | |
2059 | if (r) { | |
2060 | if (!ret) | |
2061 | ret = -EFAULT; | |
2062 | goto out; | |
2063 | } | |
2064 | } | |
2065 | p->hpt_index = i; | |
2066 | ||
2067 | out: | |
2068 | mutex_unlock(&p->mutex); | |
2069 | return ret; | |
2070 | } | |
2071 | ||
025c9511 | 2072 | static ssize_t debugfs_htab_write(struct file *file, const char __user *buf, |
e23a808b PM |
2073 | size_t len, loff_t *ppos) |
2074 | { | |
2075 | return -EACCES; | |
2076 | } | |
2077 | ||
2078 | static const struct file_operations debugfs_htab_fops = { | |
2079 | .owner = THIS_MODULE, | |
2080 | .open = debugfs_htab_open, | |
2081 | .release = debugfs_htab_release, | |
2082 | .read = debugfs_htab_read, | |
2083 | .write = debugfs_htab_write, | |
2084 | .llseek = generic_file_llseek, | |
2085 | }; | |
2086 | ||
2087 | void kvmppc_mmu_debugfs_init(struct kvm *kvm) | |
2088 | { | |
2089 | kvm->arch.htab_dentry = debugfs_create_file("htab", 0400, | |
2090 | kvm->arch.debugfs_dir, kvm, | |
2091 | &debugfs_htab_fops); | |
2092 | } | |
2093 | ||
de56a948 PM |
2094 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
2095 | { | |
2096 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
2097 | ||
c17b98cf | 2098 | vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */ |
de56a948 | 2099 | |
9e04ba69 PM |
2100 | if (kvm_is_radix(vcpu->kvm)) |
2101 | mmu->xlate = kvmppc_mmu_radix_xlate; | |
2102 | else | |
2103 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; | |
de56a948 PM |
2104 | mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr; |
2105 | ||
2106 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
2107 | } |