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d94d71cb | 1 | // SPDX-License-Identifier: GPL-2.0-only |
de56a948 | 2 | /* |
de56a948 PM |
3 | * |
4 | * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> | |
5 | */ | |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/kvm.h> | |
10 | #include <linux/kvm_host.h> | |
11 | #include <linux/highmem.h> | |
12 | #include <linux/gfp.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/hugetlb.h> | |
8936dda4 | 15 | #include <linux/vmalloc.h> |
2c9097e4 | 16 | #include <linux/srcu.h> |
a2932923 PM |
17 | #include <linux/anon_inodes.h> |
18 | #include <linux/file.h> | |
e23a808b | 19 | #include <linux/debugfs.h> |
de56a948 | 20 | |
de56a948 PM |
21 | #include <asm/kvm_ppc.h> |
22 | #include <asm/kvm_book3s.h> | |
f64e8084 | 23 | #include <asm/book3s/64/mmu-hash.h> |
de56a948 PM |
24 | #include <asm/hvcall.h> |
25 | #include <asm/synch.h> | |
26 | #include <asm/ppc-opcode.h> | |
27 | #include <asm/cputable.h> | |
94171b19 | 28 | #include <asm/pte-walk.h> |
de56a948 | 29 | |
d834915e | 30 | #include "book3s.h" |
3c78f78a SW |
31 | #include "trace_hv.h" |
32 | ||
5e985969 DG |
33 | //#define DEBUG_RESIZE_HPT 1 |
34 | ||
35 | #ifdef DEBUG_RESIZE_HPT | |
36 | #define resize_hpt_debug(resize, ...) \ | |
37 | do { \ | |
38 | printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \ | |
39 | printk(__VA_ARGS__); \ | |
40 | } while (0) | |
41 | #else | |
42 | #define resize_hpt_debug(resize, ...) \ | |
43 | do { } while (0) | |
44 | #endif | |
45 | ||
7ed661bf PM |
46 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
47 | long pte_index, unsigned long pteh, | |
48 | unsigned long ptel, unsigned long *pte_idx_ret); | |
5e985969 DG |
49 | |
50 | struct kvm_resize_hpt { | |
51 | /* These fields read-only after init */ | |
52 | struct kvm *kvm; | |
53 | struct work_struct work; | |
54 | u32 order; | |
55 | ||
0d4ee88d | 56 | /* These fields protected by kvm->arch.mmu_setup_lock */ |
3073774e SP |
57 | |
58 | /* Possible values and their usage: | |
59 | * <0 an error occurred during allocation, | |
60 | * -EBUSY allocation is in the progress, | |
61 | * 0 allocation made successfuly. | |
62 | */ | |
5e985969 | 63 | int error; |
b5baa687 | 64 | |
3073774e | 65 | /* Private to the work thread, until error != -EBUSY, |
0d4ee88d | 66 | * then protected by kvm->arch.mmu_setup_lock. |
3073774e | 67 | */ |
b5baa687 | 68 | struct kvm_hpt_info hpt; |
5e985969 DG |
69 | }; |
70 | ||
aae0777f | 71 | int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order) |
de56a948 | 72 | { |
792fc497 | 73 | unsigned long hpt = 0; |
aae0777f | 74 | int cma = 0; |
fa61a4e3 | 75 | struct page *page = NULL; |
aae0777f DG |
76 | struct revmap_entry *rev; |
77 | unsigned long npte; | |
de56a948 | 78 | |
aae0777f DG |
79 | if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER)) |
80 | return -EINVAL; | |
32fad281 | 81 | |
db9a290d | 82 | page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT)); |
792fc497 AK |
83 | if (page) { |
84 | hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page)); | |
02a68d05 | 85 | memset((void *)hpt, 0, (1ul << order)); |
aae0777f | 86 | cma = 1; |
de56a948 | 87 | } |
32fad281 | 88 | |
aae0777f | 89 | if (!hpt) |
dcda9b04 | 90 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_RETRY_MAYFAIL |
aae0777f | 91 | |__GFP_NOWARN, order - PAGE_SHIFT); |
32fad281 PM |
92 | |
93 | if (!hpt) | |
94 | return -ENOMEM; | |
95 | ||
aae0777f DG |
96 | /* HPTEs are 2**4 bytes long */ |
97 | npte = 1ul << (order - 4); | |
a56ee9f8 | 98 | |
8936dda4 | 99 | /* Allocate reverse map array */ |
42bc47b3 | 100 | rev = vmalloc(array_size(npte, sizeof(struct revmap_entry))); |
8936dda4 | 101 | if (!rev) { |
aae0777f DG |
102 | if (cma) |
103 | kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT)); | |
104 | else | |
105 | free_pages(hpt, order - PAGE_SHIFT); | |
106 | return -ENOMEM; | |
8936dda4 | 107 | } |
8936dda4 | 108 | |
aae0777f DG |
109 | info->order = order; |
110 | info->virt = hpt; | |
111 | info->cma = cma; | |
112 | info->rev = rev; | |
de56a948 | 113 | |
de56a948 | 114 | return 0; |
aae0777f | 115 | } |
8936dda4 | 116 | |
aae0777f DG |
117 | void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info) |
118 | { | |
119 | atomic64_set(&kvm->arch.mmio_update, 0); | |
120 | kvm->arch.hpt = *info; | |
121 | kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18); | |
122 | ||
3a4f1760 TH |
123 | pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n", |
124 | info->virt, (long)info->order, kvm->arch.lpid); | |
de56a948 PM |
125 | } |
126 | ||
f98a8bf9 | 127 | long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order) |
32fad281 PM |
128 | { |
129 | long err = -EBUSY; | |
f98a8bf9 | 130 | struct kvm_hpt_info info; |
32fad281 | 131 | |
0d4ee88d | 132 | mutex_lock(&kvm->arch.mmu_setup_lock); |
1b151ce4 PM |
133 | if (kvm->arch.mmu_ready) { |
134 | kvm->arch.mmu_ready = 0; | |
135 | /* order mmu_ready vs. vcpus_running */ | |
32fad281 PM |
136 | smp_mb(); |
137 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1b151ce4 | 138 | kvm->arch.mmu_ready = 1; |
32fad281 PM |
139 | goto out; |
140 | } | |
141 | } | |
18c3640c PM |
142 | if (kvm_is_radix(kvm)) { |
143 | err = kvmppc_switch_mmu_to_hpt(kvm); | |
144 | if (err) | |
145 | goto out; | |
146 | } | |
147 | ||
f98a8bf9 DG |
148 | if (kvm->arch.hpt.order == order) { |
149 | /* We already have a suitable HPT */ | |
150 | ||
32fad281 | 151 | /* Set the entire HPT to 0, i.e. invalid HPTEs */ |
3f9d4f5a | 152 | memset((void *)kvm->arch.hpt.virt, 0, 1ul << order); |
a64fd707 PM |
153 | /* |
154 | * Reset all the reverse-mapping chains for all memslots | |
155 | */ | |
156 | kvmppc_rmap_reset(kvm); | |
32fad281 | 157 | err = 0; |
f98a8bf9 | 158 | goto out; |
32fad281 | 159 | } |
f98a8bf9 | 160 | |
ef427198 | 161 | if (kvm->arch.hpt.virt) { |
f98a8bf9 | 162 | kvmppc_free_hpt(&kvm->arch.hpt); |
ef427198 PM |
163 | kvmppc_rmap_reset(kvm); |
164 | } | |
f98a8bf9 DG |
165 | |
166 | err = kvmppc_allocate_hpt(&info, order); | |
167 | if (err < 0) | |
168 | goto out; | |
169 | kvmppc_set_hpt(kvm, &info); | |
170 | ||
171 | out: | |
ecba8297 DG |
172 | if (err == 0) |
173 | /* Ensure that each vcpu will flush its TLB on next entry. */ | |
174 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
175 | ||
0d4ee88d | 176 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
32fad281 PM |
177 | return err; |
178 | } | |
179 | ||
aae0777f | 180 | void kvmppc_free_hpt(struct kvm_hpt_info *info) |
de56a948 | 181 | { |
aae0777f | 182 | vfree(info->rev); |
18c3640c | 183 | info->rev = NULL; |
aae0777f DG |
184 | if (info->cma) |
185 | kvm_free_hpt_cma(virt_to_page(info->virt), | |
186 | 1 << (info->order - PAGE_SHIFT)); | |
187 | else if (info->virt) | |
188 | free_pages(info->virt, info->order - PAGE_SHIFT); | |
189 | info->virt = 0; | |
190 | info->order = 0; | |
de56a948 PM |
191 | } |
192 | ||
da9d1d7f PM |
193 | /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ |
194 | static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize) | |
195 | { | |
196 | return (pgsize > 0x1000) ? HPTE_V_LARGE : 0; | |
197 | } | |
198 | ||
199 | /* Bits in second HPTE dword for pagesize 4k, 64k or 16M */ | |
200 | static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize) | |
201 | { | |
202 | return (pgsize == 0x10000) ? 0x1000 : 0; | |
203 | } | |
204 | ||
205 | void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, | |
206 | unsigned long porder) | |
de56a948 PM |
207 | { |
208 | unsigned long i; | |
b2b2f165 | 209 | unsigned long npages; |
c77162de PM |
210 | unsigned long hp_v, hp_r; |
211 | unsigned long addr, hash; | |
da9d1d7f PM |
212 | unsigned long psize; |
213 | unsigned long hp0, hp1; | |
7ed661bf | 214 | unsigned long idx_ret; |
c77162de | 215 | long ret; |
32fad281 | 216 | struct kvm *kvm = vcpu->kvm; |
de56a948 | 217 | |
da9d1d7f PM |
218 | psize = 1ul << porder; |
219 | npages = memslot->npages >> (porder - PAGE_SHIFT); | |
de56a948 PM |
220 | |
221 | /* VRMA can't be > 1TB */ | |
8936dda4 PM |
222 | if (npages > 1ul << (40 - porder)) |
223 | npages = 1ul << (40 - porder); | |
de56a948 | 224 | /* Can't use more than 1 HPTE per HPTEG */ |
3d089f84 DG |
225 | if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1) |
226 | npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1; | |
de56a948 | 227 | |
da9d1d7f PM |
228 | hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | |
229 | HPTE_V_BOLTED | hpte0_pgsize_encoding(psize); | |
230 | hp1 = hpte1_pgsize_encoding(psize) | | |
231 | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; | |
232 | ||
de56a948 | 233 | for (i = 0; i < npages; ++i) { |
c77162de | 234 | addr = i << porder; |
de56a948 | 235 | /* can't use hpt_hash since va > 64 bits */ |
3d089f84 DG |
236 | hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) |
237 | & kvmppc_hpt_mask(&kvm->arch.hpt); | |
de56a948 PM |
238 | /* |
239 | * We assume that the hash table is empty and no | |
240 | * vcpus are using it at this stage. Since we create | |
241 | * at most one HPTE per HPTEG, we just assume entry 7 | |
242 | * is available and use it. | |
243 | */ | |
8936dda4 | 244 | hash = (hash << 3) + 7; |
da9d1d7f PM |
245 | hp_v = hp0 | ((addr >> 16) & ~0x7fUL); |
246 | hp_r = hp1 | addr; | |
7ed661bf PM |
247 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, hash, hp_v, hp_r, |
248 | &idx_ret); | |
c77162de PM |
249 | if (ret != H_SUCCESS) { |
250 | pr_err("KVM: map_vrma at %lx failed, ret=%ld\n", | |
251 | addr, ret); | |
252 | break; | |
253 | } | |
de56a948 PM |
254 | } |
255 | } | |
256 | ||
257 | int kvmppc_mmu_hv_init(void) | |
258 | { | |
9e368f29 PM |
259 | unsigned long host_lpid, rsvd_lpid; |
260 | ||
b7557451 NP |
261 | if (!mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE)) |
262 | return -EINVAL; | |
263 | ||
f3c99f97 PM |
264 | host_lpid = 0; |
265 | if (cpu_has_feature(CPU_FTR_HVMODE)) | |
266 | host_lpid = mfspr(SPRN_LPID); | |
e55f4d58 CLG |
267 | |
268 | /* POWER8 and above have 12-bit LPIDs (10-bit in POWER7) */ | |
269 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) | |
270 | rsvd_lpid = LPID_RSVD; | |
271 | else | |
272 | rsvd_lpid = LPID_RSVD_POWER7; | |
9e368f29 | 273 | |
043cc4d7 SW |
274 | kvmppc_init_lpid(rsvd_lpid + 1); |
275 | ||
276 | kvmppc_claim_lpid(host_lpid); | |
9e368f29 | 277 | /* rsvd_lpid is reserved for use in partition switching */ |
043cc4d7 | 278 | kvmppc_claim_lpid(rsvd_lpid); |
de56a948 PM |
279 | |
280 | return 0; | |
281 | } | |
282 | ||
025c9511 | 283 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
7ed661bf PM |
284 | long pte_index, unsigned long pteh, |
285 | unsigned long ptel, unsigned long *pte_idx_ret) | |
c77162de | 286 | { |
c77162de PM |
287 | long ret; |
288 | ||
e3d8ed55 | 289 | preempt_disable(); |
7ed661bf | 290 | ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, |
8a9c8925 | 291 | kvm->mm->pgd, false, pte_idx_ret); |
e3d8ed55 | 292 | preempt_enable(); |
c77162de PM |
293 | if (ret == H_TOO_HARD) { |
294 | /* this can't happen */ | |
295 | pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); | |
296 | ret = H_RESOURCE; /* or something */ | |
297 | } | |
298 | return ret; | |
299 | ||
300 | } | |
301 | ||
697d3899 PM |
302 | static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, |
303 | gva_t eaddr) | |
304 | { | |
305 | u64 mask; | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < vcpu->arch.slb_nr; i++) { | |
309 | if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) | |
310 | continue; | |
311 | ||
312 | if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) | |
313 | mask = ESID_MASK_1T; | |
314 | else | |
315 | mask = ESID_MASK; | |
316 | ||
317 | if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) | |
318 | return &vcpu->arch.slb[i]; | |
319 | } | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, | |
324 | unsigned long ea) | |
325 | { | |
326 | unsigned long ra_mask; | |
327 | ||
8dc6cca5 | 328 | ra_mask = kvmppc_actual_pgsz(v, r) - 1; |
697d3899 PM |
329 | return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); |
330 | } | |
331 | ||
de56a948 | 332 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
93b159b4 | 333 | struct kvmppc_pte *gpte, bool data, bool iswrite) |
de56a948 | 334 | { |
697d3899 PM |
335 | struct kvm *kvm = vcpu->kvm; |
336 | struct kvmppc_slb *slbe; | |
337 | unsigned long slb_v; | |
338 | unsigned long pp, key; | |
abb7c7dd | 339 | unsigned long v, orig_v, gr; |
6f22bd32 | 340 | __be64 *hptep; |
46dec40f | 341 | long int index; |
697d3899 PM |
342 | int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); |
343 | ||
18c3640c PM |
344 | if (kvm_is_radix(vcpu->kvm)) |
345 | return kvmppc_mmu_radix_xlate(vcpu, eaddr, gpte, data, iswrite); | |
346 | ||
697d3899 PM |
347 | /* Get SLB entry */ |
348 | if (virtmode) { | |
349 | slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); | |
350 | if (!slbe) | |
351 | return -EINVAL; | |
352 | slb_v = slbe->origv; | |
353 | } else { | |
354 | /* real mode access */ | |
355 | slb_v = vcpu->kvm->arch.vrma_slb_v; | |
356 | } | |
357 | ||
91648ec0 | 358 | preempt_disable(); |
697d3899 PM |
359 | /* Find the HPTE in the hash table */ |
360 | index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, | |
361 | HPTE_V_VALID | HPTE_V_ABSENT); | |
91648ec0 | 362 | if (index < 0) { |
363 | preempt_enable(); | |
697d3899 | 364 | return -ENOENT; |
91648ec0 | 365 | } |
3f9d4f5a | 366 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
abb7c7dd PM |
367 | v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
368 | if (cpu_has_feature(CPU_FTR_ARCH_300)) | |
369 | v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1])); | |
3f9d4f5a | 370 | gr = kvm->arch.hpt.rev[index].guest_rpte; |
697d3899 | 371 | |
abb7c7dd | 372 | unlock_hpte(hptep, orig_v); |
91648ec0 | 373 | preempt_enable(); |
697d3899 PM |
374 | |
375 | gpte->eaddr = eaddr; | |
376 | gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); | |
377 | ||
378 | /* Get PP bits and key for permission check */ | |
379 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
380 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
381 | key &= slb_v; | |
382 | ||
383 | /* Calculate permissions */ | |
384 | gpte->may_read = hpte_read_permission(pp, key); | |
385 | gpte->may_write = hpte_write_permission(pp, key); | |
386 | gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); | |
387 | ||
388 | /* Storage key permission check for POWER7 */ | |
c17b98cf | 389 | if (data && virtmode) { |
697d3899 PM |
390 | int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); |
391 | if (amrfield & 1) | |
392 | gpte->may_read = 0; | |
393 | if (amrfield & 2) | |
394 | gpte->may_write = 0; | |
395 | } | |
396 | ||
397 | /* Get the guest physical address */ | |
398 | gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Quick test for whether an instruction is a load or a store. | |
404 | * If the instruction is a load or a store, then this will indicate | |
405 | * which it is, at least on server processors. (Embedded processors | |
406 | * have some external PID instructions that don't follow the rule | |
407 | * embodied here.) If the instruction isn't a load or store, then | |
408 | * this doesn't return anything useful. | |
409 | */ | |
410 | static int instruction_is_store(unsigned int instr) | |
411 | { | |
412 | unsigned int mask; | |
413 | ||
414 | mask = 0x10000000; | |
415 | if ((instr & 0xfc000000) == 0x7c000000) | |
416 | mask = 0x100; /* major opcode 31 */ | |
417 | return (instr & mask) != 0; | |
418 | } | |
419 | ||
8c99d345 | 420 | int kvmppc_hv_emulate_mmio(struct kvm_vcpu *vcpu, |
5a319350 | 421 | unsigned long gpa, gva_t ea, int is_store) |
697d3899 | 422 | { |
697d3899 | 423 | u32 last_inst; |
697d3899 | 424 | |
1b642257 SJS |
425 | /* |
426 | * Fast path - check if the guest physical address corresponds to a | |
427 | * device on the FAST_MMIO_BUS, if so we can avoid loading the | |
428 | * instruction all together, then we can just handle it and return. | |
429 | */ | |
430 | if (is_store) { | |
431 | int idx, ret; | |
432 | ||
433 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
434 | ret = kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, (gpa_t) gpa, 0, | |
435 | NULL); | |
436 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
437 | if (!ret) { | |
438 | kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); | |
439 | return RESUME_GUEST; | |
440 | } | |
441 | } | |
442 | ||
51f04726 | 443 | /* |
697d3899 PM |
444 | * If we fail, we just return to the guest and try executing it again. |
445 | */ | |
51f04726 MC |
446 | if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != |
447 | EMULATE_DONE) | |
448 | return RESUME_GUEST; | |
697d3899 PM |
449 | |
450 | /* | |
451 | * WARNING: We do not know for sure whether the instruction we just | |
452 | * read from memory is the same that caused the fault in the first | |
453 | * place. If the instruction we read is neither an load or a store, | |
454 | * then it can't access memory, so we don't need to worry about | |
455 | * enforcing access permissions. So, assuming it is a load or | |
456 | * store, we just check that its direction (load or store) is | |
457 | * consistent with the original fault, since that's what we | |
458 | * checked the access permissions against. If there is a mismatch | |
459 | * we just return and retry the instruction. | |
460 | */ | |
461 | ||
51f04726 | 462 | if (instruction_is_store(last_inst) != !!is_store) |
697d3899 PM |
463 | return RESUME_GUEST; |
464 | ||
465 | /* | |
466 | * Emulated accesses are emulated by looking at the hash for | |
467 | * translation once, then performing the access later. The | |
468 | * translation could be invalidated in the meantime in which | |
469 | * point performing the subsequent memory access on the old | |
470 | * physical address could possibly be a security hole for the | |
471 | * guest (but not the host). | |
472 | * | |
473 | * This is less of an issue for MMIO stores since they aren't | |
474 | * globally visible. It could be an issue for MMIO loads to | |
475 | * a certain extent but we'll ignore it for now. | |
476 | */ | |
477 | ||
478 | vcpu->arch.paddr_accessed = gpa; | |
6020c0f6 | 479 | vcpu->arch.vaddr_accessed = ea; |
8c99d345 | 480 | return kvmppc_emulate_mmio(vcpu); |
697d3899 PM |
481 | } |
482 | ||
8c99d345 | 483 | int kvmppc_book3s_hv_page_fault(struct kvm_vcpu *vcpu, |
697d3899 PM |
484 | unsigned long ea, unsigned long dsisr) |
485 | { | |
486 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 | 487 | unsigned long hpte[3], r; |
abb7c7dd | 488 | unsigned long hnow_v, hnow_r; |
6f22bd32 | 489 | __be64 *hptep; |
342d3db7 | 490 | unsigned long mmu_seq, psize, pte_size; |
1066f772 | 491 | unsigned long gpa_base, gfn_base; |
cd758a9b | 492 | unsigned long gpa, gfn, hva, pfn, hpa; |
697d3899 | 493 | struct kvm_memory_slot *memslot; |
342d3db7 | 494 | unsigned long *rmap; |
697d3899 | 495 | struct revmap_entry *rev; |
cd758a9b PM |
496 | struct page *page; |
497 | long index, ret; | |
30bda41a | 498 | bool is_ci; |
cd758a9b PM |
499 | bool writing, write_ok; |
500 | unsigned int shift; | |
bad3b507 | 501 | unsigned long rcbits; |
a56ee9f8 | 502 | long mmio_update; |
cd758a9b | 503 | pte_t pte, *ptep; |
697d3899 | 504 | |
5a319350 | 505 | if (kvm_is_radix(kvm)) |
8c99d345 | 506 | return kvmppc_book3s_radix_page_fault(vcpu, ea, dsisr); |
5a319350 | 507 | |
697d3899 PM |
508 | /* |
509 | * Real-mode code has already searched the HPT and found the | |
510 | * entry we're interested in. Lock the entry and check that | |
511 | * it hasn't changed. If it has, just return and re-execute the | |
512 | * instruction. | |
513 | */ | |
514 | if (ea != vcpu->arch.pgfault_addr) | |
515 | return RESUME_GUEST; | |
a56ee9f8 YX |
516 | |
517 | if (vcpu->arch.pgfault_cache) { | |
518 | mmio_update = atomic64_read(&kvm->arch.mmio_update); | |
519 | if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) { | |
520 | r = vcpu->arch.pgfault_cache->rpte; | |
8dc6cca5 PM |
521 | psize = kvmppc_actual_pgsz(vcpu->arch.pgfault_hpte[0], |
522 | r); | |
a56ee9f8 YX |
523 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); |
524 | gfn_base = gpa_base >> PAGE_SHIFT; | |
525 | gpa = gpa_base | (ea & (psize - 1)); | |
8c99d345 | 526 | return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, |
a56ee9f8 YX |
527 | dsisr & DSISR_ISSTORE); |
528 | } | |
529 | } | |
697d3899 | 530 | index = vcpu->arch.pgfault_index; |
3f9d4f5a DG |
531 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
532 | rev = &kvm->arch.hpt.rev[index]; | |
697d3899 PM |
533 | preempt_disable(); |
534 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
535 | cpu_relax(); | |
6f22bd32 AG |
536 | hpte[0] = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
537 | hpte[1] = be64_to_cpu(hptep[1]); | |
342d3db7 | 538 | hpte[2] = r = rev->guest_rpte; |
a4bd6eb0 | 539 | unlock_hpte(hptep, hpte[0]); |
697d3899 PM |
540 | preempt_enable(); |
541 | ||
abb7c7dd PM |
542 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
543 | hpte[0] = hpte_new_to_old_v(hpte[0], hpte[1]); | |
544 | hpte[1] = hpte_new_to_old_r(hpte[1]); | |
545 | } | |
697d3899 PM |
546 | if (hpte[0] != vcpu->arch.pgfault_hpte[0] || |
547 | hpte[1] != vcpu->arch.pgfault_hpte[1]) | |
548 | return RESUME_GUEST; | |
549 | ||
550 | /* Translate the logical address and get the page */ | |
8dc6cca5 | 551 | psize = kvmppc_actual_pgsz(hpte[0], r); |
1066f772 PM |
552 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); |
553 | gfn_base = gpa_base >> PAGE_SHIFT; | |
554 | gpa = gpa_base | (ea & (psize - 1)); | |
70bddfef | 555 | gfn = gpa >> PAGE_SHIFT; |
697d3899 PM |
556 | memslot = gfn_to_memslot(kvm, gfn); |
557 | ||
3c78f78a SW |
558 | trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr); |
559 | ||
697d3899 | 560 | /* No memslot means it's an emulated MMIO region */ |
70bddfef | 561 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
8c99d345 | 562 | return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, |
697d3899 | 563 | dsisr & DSISR_ISSTORE); |
697d3899 | 564 | |
1066f772 PM |
565 | /* |
566 | * This should never happen, because of the slot_is_aligned() | |
567 | * check in kvmppc_do_h_enter(). | |
568 | */ | |
569 | if (gfn_base < memslot->base_gfn) | |
570 | return -EFAULT; | |
571 | ||
342d3db7 PM |
572 | /* used to check for invalidations in progress */ |
573 | mmu_seq = kvm->mmu_notifier_seq; | |
574 | smp_rmb(); | |
575 | ||
3c78f78a | 576 | ret = -EFAULT; |
342d3db7 | 577 | page = NULL; |
4cf302bc PM |
578 | writing = (dsisr & DSISR_ISSTORE) != 0; |
579 | /* If writing != 0, then the HPTE must allow writing, if we get here */ | |
580 | write_ok = writing; | |
342d3db7 | 581 | hva = gfn_to_hva_memslot(memslot, gfn); |
cd758a9b PM |
582 | |
583 | /* | |
584 | * Do a fast check first, since __gfn_to_pfn_memslot doesn't | |
585 | * do it with !atomic && !async, which is how we call it. | |
586 | * We always ask for write permission since the common case | |
587 | * is that the page is writable. | |
588 | */ | |
dadbb612 | 589 | if (get_user_page_fast_only(hva, FOLL_WRITE, &page)) { |
cd758a9b | 590 | write_ok = true; |
342d3db7 | 591 | } else { |
cd758a9b PM |
592 | /* Call KVM generic code to do the slow-path check */ |
593 | pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL, | |
4a42d848 | 594 | writing, &write_ok, NULL); |
cd758a9b PM |
595 | if (is_error_noslot_pfn(pfn)) |
596 | return -EFAULT; | |
597 | page = NULL; | |
598 | if (pfn_valid(pfn)) { | |
599 | page = pfn_to_page(pfn); | |
600 | if (PageReserved(page)) | |
601 | page = NULL; | |
4cf302bc | 602 | } |
342d3db7 PM |
603 | } |
604 | ||
cd758a9b PM |
605 | /* |
606 | * Read the PTE from the process' radix tree and use that | |
607 | * so we get the shift and attribute bits. | |
608 | */ | |
9781e759 AK |
609 | spin_lock(&kvm->mmu_lock); |
610 | ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &shift); | |
ae49deda PM |
611 | pte = __pte(0); |
612 | if (ptep) | |
9781e759 AK |
613 | pte = READ_ONCE(*ptep); |
614 | spin_unlock(&kvm->mmu_lock); | |
cd758a9b PM |
615 | /* |
616 | * If the PTE disappeared temporarily due to a THP | |
617 | * collapse, just return and let the guest try again. | |
618 | */ | |
ae49deda | 619 | if (!pte_present(pte)) { |
cd758a9b PM |
620 | if (page) |
621 | put_page(page); | |
622 | return RESUME_GUEST; | |
623 | } | |
cd758a9b PM |
624 | hpa = pte_pfn(pte) << PAGE_SHIFT; |
625 | pte_size = PAGE_SIZE; | |
626 | if (shift) | |
627 | pte_size = 1ul << shift; | |
628 | is_ci = pte_ci(pte); | |
629 | ||
342d3db7 PM |
630 | if (psize > pte_size) |
631 | goto out_put; | |
cd758a9b PM |
632 | if (pte_size > psize) |
633 | hpa |= hva & (pte_size - psize); | |
342d3db7 PM |
634 | |
635 | /* Check WIMG vs. the actual page we're accessing */ | |
30bda41a AK |
636 | if (!hpte_cache_flags_ok(r, is_ci)) { |
637 | if (is_ci) | |
3c78f78a | 638 | goto out_put; |
342d3db7 PM |
639 | /* |
640 | * Allow guest to map emulated device memory as | |
641 | * uncacheable, but actually make it cacheable. | |
642 | */ | |
643 | r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; | |
644 | } | |
645 | ||
caaa4c80 | 646 | /* |
cd758a9b PM |
647 | * Set the HPTE to point to hpa. |
648 | * Since the hpa is at PAGE_SIZE granularity, make sure we | |
caaa4c80 PM |
649 | * don't mask out lower-order bits if psize < PAGE_SIZE. |
650 | */ | |
651 | if (psize < PAGE_SIZE) | |
652 | psize = PAGE_SIZE; | |
cd758a9b | 653 | r = (r & HPTE_R_KEY_HI) | (r & ~(HPTE_R_PP0 - psize)) | hpa; |
4cf302bc PM |
654 | if (hpte_is_writable(r) && !write_ok) |
655 | r = hpte_make_readonly(r); | |
342d3db7 PM |
656 | ret = RESUME_GUEST; |
657 | preempt_disable(); | |
658 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
659 | cpu_relax(); | |
abb7c7dd PM |
660 | hnow_v = be64_to_cpu(hptep[0]); |
661 | hnow_r = be64_to_cpu(hptep[1]); | |
662 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
663 | hnow_v = hpte_new_to_old_v(hnow_v, hnow_r); | |
664 | hnow_r = hpte_new_to_old_r(hnow_r); | |
665 | } | |
38c53af8 PM |
666 | |
667 | /* | |
668 | * If the HPT is being resized, don't update the HPTE, | |
669 | * instead let the guest retry after the resize operation is complete. | |
072df813 | 670 | * The synchronization for mmu_ready test vs. set is provided |
38c53af8 PM |
671 | * by the HPTE lock. |
672 | */ | |
072df813 | 673 | if (!kvm->arch.mmu_ready) |
38c53af8 PM |
674 | goto out_unlock; |
675 | ||
abb7c7dd PM |
676 | if ((hnow_v & ~HPTE_V_HVLOCK) != hpte[0] || hnow_r != hpte[1] || |
677 | rev->guest_rpte != hpte[2]) | |
342d3db7 PM |
678 | /* HPTE has been changed under us; let the guest retry */ |
679 | goto out_unlock; | |
680 | hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
681 | ||
1066f772 PM |
682 | /* Always put the HPTE in the rmap chain for the page base address */ |
683 | rmap = &memslot->arch.rmap[gfn_base - memslot->base_gfn]; | |
342d3db7 PM |
684 | lock_rmap(rmap); |
685 | ||
686 | /* Check if we might have been invalidated; let the guest retry if so */ | |
687 | ret = RESUME_GUEST; | |
8ca40a70 | 688 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) { |
342d3db7 PM |
689 | unlock_rmap(rmap); |
690 | goto out_unlock; | |
691 | } | |
4cf302bc | 692 | |
bad3b507 PM |
693 | /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ |
694 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
695 | r &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
696 | ||
6f22bd32 | 697 | if (be64_to_cpu(hptep[0]) & HPTE_V_VALID) { |
4cf302bc PM |
698 | /* HPTE was previously valid, so we need to invalidate it */ |
699 | unlock_rmap(rmap); | |
6f22bd32 | 700 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
4cf302bc | 701 | kvmppc_invalidate_hpte(kvm, hptep, index); |
bad3b507 | 702 | /* don't lose previous R and C bits */ |
6f22bd32 | 703 | r |= be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); |
4cf302bc PM |
704 | } else { |
705 | kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); | |
706 | } | |
342d3db7 | 707 | |
abb7c7dd PM |
708 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
709 | r = hpte_old_to_new_r(hpte[0], r); | |
710 | hpte[0] = hpte_old_to_new_v(hpte[0]); | |
711 | } | |
6f22bd32 | 712 | hptep[1] = cpu_to_be64(r); |
342d3db7 | 713 | eieio(); |
a4bd6eb0 | 714 | __unlock_hpte(hptep, hpte[0]); |
342d3db7 PM |
715 | asm volatile("ptesync" : : : "memory"); |
716 | preempt_enable(); | |
4cf302bc | 717 | if (page && hpte_is_writable(r)) |
cd758a9b | 718 | set_page_dirty_lock(page); |
342d3db7 PM |
719 | |
720 | out_put: | |
3c78f78a SW |
721 | trace_kvm_page_fault_exit(vcpu, hpte, ret); |
722 | ||
cd758a9b PM |
723 | if (page) |
724 | put_page(page); | |
342d3db7 PM |
725 | return ret; |
726 | ||
727 | out_unlock: | |
a4bd6eb0 | 728 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 PM |
729 | preempt_enable(); |
730 | goto out_put; | |
731 | } | |
732 | ||
18c3640c | 733 | void kvmppc_rmap_reset(struct kvm *kvm) |
a64fd707 PM |
734 | { |
735 | struct kvm_memslots *slots; | |
736 | struct kvm_memory_slot *memslot; | |
737 | int srcu_idx; | |
738 | ||
739 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
9f6b8029 | 740 | slots = kvm_memslots(kvm); |
a64fd707 | 741 | kvm_for_each_memslot(memslot, slots) { |
234ff0b7 PM |
742 | /* Mutual exclusion with kvm_unmap_hva_range etc. */ |
743 | spin_lock(&kvm->mmu_lock); | |
a64fd707 PM |
744 | /* |
745 | * This assumes it is acceptable to lose reference and | |
746 | * change bits across a reset. | |
747 | */ | |
748 | memset(memslot->arch.rmap, 0, | |
749 | memslot->npages * sizeof(*memslot->arch.rmap)); | |
234ff0b7 | 750 | spin_unlock(&kvm->mmu_lock); |
a64fd707 PM |
751 | } |
752 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
753 | } | |
754 | ||
01756099 PM |
755 | typedef int (*hva_handler_fn)(struct kvm *kvm, struct kvm_memory_slot *memslot, |
756 | unsigned long gfn); | |
757 | ||
84504ef3 TY |
758 | static int kvm_handle_hva_range(struct kvm *kvm, |
759 | unsigned long start, | |
760 | unsigned long end, | |
01756099 | 761 | hva_handler_fn handler) |
342d3db7 PM |
762 | { |
763 | int ret; | |
764 | int retval = 0; | |
765 | struct kvm_memslots *slots; | |
766 | struct kvm_memory_slot *memslot; | |
767 | ||
768 | slots = kvm_memslots(kvm); | |
769 | kvm_for_each_memslot(memslot, slots) { | |
84504ef3 TY |
770 | unsigned long hva_start, hva_end; |
771 | gfn_t gfn, gfn_end; | |
772 | ||
773 | hva_start = max(start, memslot->userspace_addr); | |
774 | hva_end = min(end, memslot->userspace_addr + | |
775 | (memslot->npages << PAGE_SHIFT)); | |
776 | if (hva_start >= hva_end) | |
777 | continue; | |
778 | /* | |
779 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
780 | * {gfn, gfn+1, ..., gfn_end-1}. | |
781 | */ | |
782 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
783 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
342d3db7 | 784 | |
84504ef3 | 785 | for (; gfn < gfn_end; ++gfn) { |
01756099 | 786 | ret = handler(kvm, memslot, gfn); |
342d3db7 PM |
787 | retval |= ret; |
788 | } | |
789 | } | |
790 | ||
791 | return retval; | |
792 | } | |
793 | ||
84504ef3 | 794 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
01756099 | 795 | hva_handler_fn handler) |
84504ef3 TY |
796 | { |
797 | return kvm_handle_hva_range(kvm, hva, hva + 1, handler); | |
798 | } | |
799 | ||
639e4597 DG |
800 | /* Must be called with both HPTE and rmap locked */ |
801 | static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i, | |
e641a317 | 802 | struct kvm_memory_slot *memslot, |
639e4597 DG |
803 | unsigned long *rmapp, unsigned long gfn) |
804 | { | |
805 | __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); | |
806 | struct revmap_entry *rev = kvm->arch.hpt.rev; | |
807 | unsigned long j, h; | |
808 | unsigned long ptel, psize, rcbits; | |
809 | ||
810 | j = rev[i].forw; | |
811 | if (j == i) { | |
812 | /* chain is now empty */ | |
813 | *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); | |
814 | } else { | |
815 | /* remove i from chain */ | |
816 | h = rev[i].back; | |
817 | rev[h].forw = j; | |
818 | rev[j].back = h; | |
819 | rev[i].forw = rev[i].back = i; | |
820 | *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; | |
821 | } | |
822 | ||
823 | /* Now check and modify the HPTE */ | |
824 | ptel = rev[i].guest_rpte; | |
8dc6cca5 | 825 | psize = kvmppc_actual_pgsz(be64_to_cpu(hptep[0]), ptel); |
639e4597 DG |
826 | if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && |
827 | hpte_rpn(ptel, psize) == gfn) { | |
828 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); | |
829 | kvmppc_invalidate_hpte(kvm, hptep, i); | |
830 | hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO); | |
831 | /* Harvest R and C */ | |
832 | rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); | |
833 | *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; | |
e641a317 PM |
834 | if ((rcbits & HPTE_R_C) && memslot->dirty_bitmap) |
835 | kvmppc_update_dirty_map(memslot, gfn, psize); | |
639e4597 DG |
836 | if (rcbits & ~rev[i].guest_rpte) { |
837 | rev[i].guest_rpte = ptel | rcbits; | |
838 | note_hpte_modification(kvm, &rev[i]); | |
839 | } | |
840 | } | |
841 | } | |
842 | ||
01756099 | 843 | static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
844 | unsigned long gfn) |
845 | { | |
639e4597 | 846 | unsigned long i; |
6f22bd32 | 847 | __be64 *hptep; |
01756099 | 848 | unsigned long *rmapp; |
342d3db7 | 849 | |
01756099 | 850 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
342d3db7 | 851 | for (;;) { |
bad3b507 | 852 | lock_rmap(rmapp); |
342d3db7 | 853 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
bad3b507 | 854 | unlock_rmap(rmapp); |
342d3db7 PM |
855 | break; |
856 | } | |
857 | ||
858 | /* | |
859 | * To avoid an ABBA deadlock with the HPTE lock bit, | |
bad3b507 PM |
860 | * we can't spin on the HPTE lock while holding the |
861 | * rmap chain lock. | |
342d3db7 PM |
862 | */ |
863 | i = *rmapp & KVMPPC_RMAP_INDEX; | |
3f9d4f5a | 864 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
bad3b507 PM |
865 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { |
866 | /* unlock rmap before spinning on the HPTE lock */ | |
867 | unlock_rmap(rmapp); | |
6f22bd32 | 868 | while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK) |
bad3b507 PM |
869 | cpu_relax(); |
870 | continue; | |
871 | } | |
342d3db7 | 872 | |
e641a317 | 873 | kvmppc_unmap_hpte(kvm, i, memslot, rmapp, gfn); |
bad3b507 | 874 | unlock_rmap(rmapp); |
a4bd6eb0 | 875 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 PM |
876 | } |
877 | return 0; | |
878 | } | |
879 | ||
3a167bea | 880 | int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start, unsigned long end) |
b3ae2096 | 881 | { |
01756099 PM |
882 | hva_handler_fn handler; |
883 | ||
884 | handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp; | |
885 | kvm_handle_hva_range(kvm, start, end, handler); | |
b3ae2096 TY |
886 | return 0; |
887 | } | |
888 | ||
3a167bea AK |
889 | void kvmppc_core_flush_memslot_hv(struct kvm *kvm, |
890 | struct kvm_memory_slot *memslot) | |
dfe49dbd | 891 | { |
dfe49dbd PM |
892 | unsigned long gfn; |
893 | unsigned long n; | |
01756099 | 894 | unsigned long *rmapp; |
dfe49dbd | 895 | |
dfe49dbd | 896 | gfn = memslot->base_gfn; |
01756099 | 897 | rmapp = memslot->arch.rmap; |
5af3e9d0 PM |
898 | if (kvm_is_radix(kvm)) { |
899 | kvmppc_radix_flush_memslot(kvm, memslot); | |
900 | return; | |
901 | } | |
902 | ||
01756099 | 903 | for (n = memslot->npages; n; --n, ++gfn) { |
dfe49dbd PM |
904 | /* |
905 | * Testing the present bit without locking is OK because | |
906 | * the memslot has been marked invalid already, and hence | |
907 | * no new HPTEs referencing this page can be created, | |
908 | * thus the present bit can't go from 0 to 1. | |
909 | */ | |
910 | if (*rmapp & KVMPPC_RMAP_PRESENT) | |
01756099 | 911 | kvm_unmap_rmapp(kvm, memslot, gfn); |
dfe49dbd | 912 | ++rmapp; |
dfe49dbd PM |
913 | } |
914 | } | |
915 | ||
01756099 | 916 | static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
917 | unsigned long gfn) |
918 | { | |
3f9d4f5a | 919 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 | 920 | unsigned long head, i, j; |
6f22bd32 | 921 | __be64 *hptep; |
55514893 | 922 | int ret = 0; |
01756099 | 923 | unsigned long *rmapp; |
55514893 | 924 | |
01756099 | 925 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
55514893 PM |
926 | retry: |
927 | lock_rmap(rmapp); | |
928 | if (*rmapp & KVMPPC_RMAP_REFERENCED) { | |
929 | *rmapp &= ~KVMPPC_RMAP_REFERENCED; | |
930 | ret = 1; | |
931 | } | |
932 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { | |
933 | unlock_rmap(rmapp); | |
934 | return ret; | |
935 | } | |
936 | ||
937 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
938 | do { | |
3f9d4f5a | 939 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
55514893 PM |
940 | j = rev[i].forw; |
941 | ||
942 | /* If this HPTE isn't referenced, ignore it */ | |
6f22bd32 | 943 | if (!(be64_to_cpu(hptep[1]) & HPTE_R_R)) |
55514893 PM |
944 | continue; |
945 | ||
946 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
947 | /* unlock rmap before spinning on the HPTE lock */ | |
948 | unlock_rmap(rmapp); | |
6f22bd32 | 949 | while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK) |
55514893 PM |
950 | cpu_relax(); |
951 | goto retry; | |
952 | } | |
953 | ||
954 | /* Now check and modify the HPTE */ | |
6f22bd32 AG |
955 | if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && |
956 | (be64_to_cpu(hptep[1]) & HPTE_R_R)) { | |
55514893 | 957 | kvmppc_clear_ref_hpte(kvm, hptep, i); |
a1b4a0f6 PM |
958 | if (!(rev[i].guest_rpte & HPTE_R_R)) { |
959 | rev[i].guest_rpte |= HPTE_R_R; | |
960 | note_hpte_modification(kvm, &rev[i]); | |
961 | } | |
55514893 PM |
962 | ret = 1; |
963 | } | |
a4bd6eb0 | 964 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
55514893 PM |
965 | } while ((i = j) != head); |
966 | ||
967 | unlock_rmap(rmapp); | |
968 | return ret; | |
342d3db7 PM |
969 | } |
970 | ||
57128468 | 971 | int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end) |
342d3db7 | 972 | { |
01756099 PM |
973 | hva_handler_fn handler; |
974 | ||
975 | handler = kvm_is_radix(kvm) ? kvm_age_radix : kvm_age_rmapp; | |
976 | return kvm_handle_hva_range(kvm, start, end, handler); | |
342d3db7 PM |
977 | } |
978 | ||
01756099 | 979 | static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
342d3db7 PM |
980 | unsigned long gfn) |
981 | { | |
3f9d4f5a | 982 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 PM |
983 | unsigned long head, i, j; |
984 | unsigned long *hp; | |
985 | int ret = 1; | |
01756099 | 986 | unsigned long *rmapp; |
55514893 | 987 | |
01756099 | 988 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
55514893 PM |
989 | if (*rmapp & KVMPPC_RMAP_REFERENCED) |
990 | return 1; | |
991 | ||
992 | lock_rmap(rmapp); | |
993 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
994 | goto out; | |
995 | ||
996 | if (*rmapp & KVMPPC_RMAP_PRESENT) { | |
997 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
998 | do { | |
3f9d4f5a | 999 | hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4)); |
55514893 | 1000 | j = rev[i].forw; |
6f22bd32 | 1001 | if (be64_to_cpu(hp[1]) & HPTE_R_R) |
55514893 PM |
1002 | goto out; |
1003 | } while ((i = j) != head); | |
1004 | } | |
1005 | ret = 0; | |
1006 | ||
1007 | out: | |
1008 | unlock_rmap(rmapp); | |
1009 | return ret; | |
342d3db7 PM |
1010 | } |
1011 | ||
3a167bea | 1012 | int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva) |
342d3db7 | 1013 | { |
01756099 PM |
1014 | hva_handler_fn handler; |
1015 | ||
1016 | handler = kvm_is_radix(kvm) ? kvm_test_age_radix : kvm_test_age_rmapp; | |
1017 | return kvm_handle_hva(kvm, hva, handler); | |
342d3db7 PM |
1018 | } |
1019 | ||
3a167bea | 1020 | void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte) |
342d3db7 | 1021 | { |
01756099 PM |
1022 | hva_handler_fn handler; |
1023 | ||
1024 | handler = kvm_is_radix(kvm) ? kvm_unmap_radix : kvm_unmap_rmapp; | |
1025 | kvm_handle_hva(kvm, hva, handler); | |
de56a948 PM |
1026 | } |
1027 | ||
6c576e74 PM |
1028 | static int vcpus_running(struct kvm *kvm) |
1029 | { | |
1030 | return atomic_read(&kvm->arch.vcpus_running) != 0; | |
1031 | } | |
1032 | ||
687414be AK |
1033 | /* |
1034 | * Returns the number of system pages that are dirty. | |
1035 | * This can be more than 1 if we find a huge-page HPTE. | |
1036 | */ | |
1037 | static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp) | |
82ed3616 | 1038 | { |
3f9d4f5a | 1039 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
82ed3616 | 1040 | unsigned long head, i, j; |
687414be | 1041 | unsigned long n; |
6c576e74 | 1042 | unsigned long v, r; |
6f22bd32 | 1043 | __be64 *hptep; |
687414be | 1044 | int npages_dirty = 0; |
82ed3616 PM |
1045 | |
1046 | retry: | |
1047 | lock_rmap(rmapp); | |
82ed3616 PM |
1048 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
1049 | unlock_rmap(rmapp); | |
687414be | 1050 | return npages_dirty; |
82ed3616 PM |
1051 | } |
1052 | ||
1053 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1054 | do { | |
6f22bd32 | 1055 | unsigned long hptep1; |
3f9d4f5a | 1056 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
82ed3616 PM |
1057 | j = rev[i].forw; |
1058 | ||
6c576e74 PM |
1059 | /* |
1060 | * Checking the C (changed) bit here is racy since there | |
1061 | * is no guarantee about when the hardware writes it back. | |
1062 | * If the HPTE is not writable then it is stable since the | |
1063 | * page can't be written to, and we would have done a tlbie | |
1064 | * (which forces the hardware to complete any writeback) | |
1065 | * when making the HPTE read-only. | |
1066 | * If vcpus are running then this call is racy anyway | |
1067 | * since the page could get dirtied subsequently, so we | |
1068 | * expect there to be a further call which would pick up | |
1069 | * any delayed C bit writeback. | |
1070 | * Otherwise we need to do the tlbie even if C==0 in | |
1071 | * order to pick up any delayed writeback of C. | |
1072 | */ | |
6f22bd32 AG |
1073 | hptep1 = be64_to_cpu(hptep[1]); |
1074 | if (!(hptep1 & HPTE_R_C) && | |
1075 | (!hpte_is_writable(hptep1) || vcpus_running(kvm))) | |
82ed3616 PM |
1076 | continue; |
1077 | ||
1078 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
1079 | /* unlock rmap before spinning on the HPTE lock */ | |
1080 | unlock_rmap(rmapp); | |
6f22bd32 | 1081 | while (hptep[0] & cpu_to_be64(HPTE_V_HVLOCK)) |
82ed3616 PM |
1082 | cpu_relax(); |
1083 | goto retry; | |
1084 | } | |
1085 | ||
1086 | /* Now check and modify the HPTE */ | |
f6fb9e84 | 1087 | if (!(hptep[0] & cpu_to_be64(HPTE_V_VALID))) { |
a4bd6eb0 | 1088 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
6c576e74 | 1089 | continue; |
f6fb9e84 | 1090 | } |
6c576e74 PM |
1091 | |
1092 | /* need to make it temporarily absent so C is stable */ | |
6f22bd32 | 1093 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
6c576e74 | 1094 | kvmppc_invalidate_hpte(kvm, hptep, i); |
6f22bd32 AG |
1095 | v = be64_to_cpu(hptep[0]); |
1096 | r = be64_to_cpu(hptep[1]); | |
6c576e74 | 1097 | if (r & HPTE_R_C) { |
6f22bd32 | 1098 | hptep[1] = cpu_to_be64(r & ~HPTE_R_C); |
a1b4a0f6 PM |
1099 | if (!(rev[i].guest_rpte & HPTE_R_C)) { |
1100 | rev[i].guest_rpte |= HPTE_R_C; | |
1101 | note_hpte_modification(kvm, &rev[i]); | |
1102 | } | |
8dc6cca5 | 1103 | n = kvmppc_actual_pgsz(v, r); |
687414be AK |
1104 | n = (n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1105 | if (n > npages_dirty) | |
1106 | npages_dirty = n; | |
6c576e74 | 1107 | eieio(); |
82ed3616 | 1108 | } |
a4bd6eb0 | 1109 | v &= ~HPTE_V_ABSENT; |
6c576e74 | 1110 | v |= HPTE_V_VALID; |
a4bd6eb0 | 1111 | __unlock_hpte(hptep, v); |
82ed3616 PM |
1112 | } while ((i = j) != head); |
1113 | ||
1114 | unlock_rmap(rmapp); | |
687414be | 1115 | return npages_dirty; |
82ed3616 PM |
1116 | } |
1117 | ||
8f7b79b8 | 1118 | void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa, |
c35635ef PM |
1119 | struct kvm_memory_slot *memslot, |
1120 | unsigned long *map) | |
1121 | { | |
1122 | unsigned long gfn; | |
1123 | ||
1124 | if (!vpa->dirty || !vpa->pinned_addr) | |
1125 | return; | |
1126 | gfn = vpa->gpa >> PAGE_SHIFT; | |
1127 | if (gfn < memslot->base_gfn || | |
1128 | gfn >= memslot->base_gfn + memslot->npages) | |
1129 | return; | |
1130 | ||
1131 | vpa->dirty = false; | |
1132 | if (map) | |
1133 | __set_bit_le(gfn - memslot->base_gfn, map); | |
1134 | } | |
1135 | ||
8f7b79b8 PM |
1136 | long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm, |
1137 | struct kvm_memory_slot *memslot, unsigned long *map) | |
82ed3616 | 1138 | { |
e641a317 | 1139 | unsigned long i; |
dfe49dbd | 1140 | unsigned long *rmapp; |
82ed3616 PM |
1141 | |
1142 | preempt_disable(); | |
d89cc617 | 1143 | rmapp = memslot->arch.rmap; |
82ed3616 | 1144 | for (i = 0; i < memslot->npages; ++i) { |
687414be AK |
1145 | int npages = kvm_test_clear_dirty_npages(kvm, rmapp); |
1146 | /* | |
1147 | * Note that if npages > 0 then i must be a multiple of npages, | |
1148 | * since we always put huge-page HPTEs in the rmap chain | |
1149 | * corresponding to their page base address. | |
1150 | */ | |
e641a317 PM |
1151 | if (npages) |
1152 | set_dirty_bits(map, i, npages); | |
82ed3616 PM |
1153 | ++rmapp; |
1154 | } | |
1155 | preempt_enable(); | |
1156 | return 0; | |
1157 | } | |
1158 | ||
93e60249 PM |
1159 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
1160 | unsigned long *nb_ret) | |
1161 | { | |
1162 | struct kvm_memory_slot *memslot; | |
1163 | unsigned long gfn = gpa >> PAGE_SHIFT; | |
342d3db7 PM |
1164 | struct page *page, *pages[1]; |
1165 | int npages; | |
c35635ef | 1166 | unsigned long hva, offset; |
2c9097e4 | 1167 | int srcu_idx; |
93e60249 | 1168 | |
2c9097e4 | 1169 | srcu_idx = srcu_read_lock(&kvm->srcu); |
93e60249 PM |
1170 | memslot = gfn_to_memslot(kvm, gfn); |
1171 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) | |
2c9097e4 | 1172 | goto err; |
c17b98cf | 1173 | hva = gfn_to_hva_memslot(memslot, gfn); |
73b0140b | 1174 | npages = get_user_pages_fast(hva, 1, FOLL_WRITE, pages); |
c17b98cf PM |
1175 | if (npages < 1) |
1176 | goto err; | |
1177 | page = pages[0]; | |
2c9097e4 PM |
1178 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
1179 | ||
c35635ef | 1180 | offset = gpa & (PAGE_SIZE - 1); |
93e60249 | 1181 | if (nb_ret) |
c35635ef | 1182 | *nb_ret = PAGE_SIZE - offset; |
93e60249 | 1183 | return page_address(page) + offset; |
2c9097e4 PM |
1184 | |
1185 | err: | |
1186 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1187 | return NULL; | |
93e60249 PM |
1188 | } |
1189 | ||
c35635ef PM |
1190 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, |
1191 | bool dirty) | |
93e60249 PM |
1192 | { |
1193 | struct page *page = virt_to_page(va); | |
c35635ef PM |
1194 | struct kvm_memory_slot *memslot; |
1195 | unsigned long gfn; | |
c35635ef | 1196 | int srcu_idx; |
93e60249 | 1197 | |
93e60249 | 1198 | put_page(page); |
c35635ef | 1199 | |
c17b98cf | 1200 | if (!dirty) |
c35635ef PM |
1201 | return; |
1202 | ||
e641a317 | 1203 | /* We need to mark this page dirty in the memslot dirty_bitmap, if any */ |
c35635ef PM |
1204 | gfn = gpa >> PAGE_SHIFT; |
1205 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
1206 | memslot = gfn_to_memslot(kvm, gfn); | |
e641a317 PM |
1207 | if (memslot && memslot->dirty_bitmap) |
1208 | set_bit_le(gfn - memslot->base_gfn, memslot->dirty_bitmap); | |
c35635ef | 1209 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
93e60249 PM |
1210 | } |
1211 | ||
5e985969 DG |
1212 | /* |
1213 | * HPT resizing | |
1214 | */ | |
1215 | static int resize_hpt_allocate(struct kvm_resize_hpt *resize) | |
1216 | { | |
b5baa687 DG |
1217 | int rc; |
1218 | ||
1219 | rc = kvmppc_allocate_hpt(&resize->hpt, resize->order); | |
1220 | if (rc < 0) | |
1221 | return rc; | |
1222 | ||
1223 | resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n", | |
1224 | resize->hpt.virt); | |
1225 | ||
5e985969 DG |
1226 | return 0; |
1227 | } | |
1228 | ||
b5baa687 DG |
1229 | static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize, |
1230 | unsigned long idx) | |
1231 | { | |
1232 | struct kvm *kvm = resize->kvm; | |
1233 | struct kvm_hpt_info *old = &kvm->arch.hpt; | |
1234 | struct kvm_hpt_info *new = &resize->hpt; | |
1235 | unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1; | |
1236 | unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1; | |
1237 | __be64 *hptep, *new_hptep; | |
1238 | unsigned long vpte, rpte, guest_rpte; | |
1239 | int ret; | |
1240 | struct revmap_entry *rev; | |
ded13fc1 | 1241 | unsigned long apsize, avpn, pteg, hash; |
b5baa687 | 1242 | unsigned long new_idx, new_pteg, replace_vpte; |
ded13fc1 | 1243 | int pshift; |
b5baa687 DG |
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 | ||
790a9df5 DG |
1264 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1265 | rpte = be64_to_cpu(hptep[1]); | |
1266 | vpte = hpte_new_to_old_v(vpte, rpte); | |
1267 | } | |
1268 | ||
b5baa687 DG |
1269 | /* Unmap */ |
1270 | rev = &old->rev[idx]; | |
1271 | guest_rpte = rev->guest_rpte; | |
1272 | ||
1273 | ret = -EIO; | |
8dc6cca5 | 1274 | apsize = kvmppc_actual_pgsz(vpte, guest_rpte); |
b5baa687 DG |
1275 | if (!apsize) |
1276 | goto out; | |
1277 | ||
1278 | if (vpte & HPTE_V_VALID) { | |
1279 | unsigned long gfn = hpte_rpn(guest_rpte, apsize); | |
1280 | int srcu_idx = srcu_read_lock(&kvm->srcu); | |
1281 | struct kvm_memory_slot *memslot = | |
1282 | __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1283 | ||
1284 | if (memslot) { | |
1285 | unsigned long *rmapp; | |
1286 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1287 | ||
1288 | lock_rmap(rmapp); | |
e641a317 | 1289 | kvmppc_unmap_hpte(kvm, idx, memslot, rmapp, gfn); |
b5baa687 DG |
1290 | unlock_rmap(rmapp); |
1291 | } | |
1292 | ||
1293 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1294 | } | |
1295 | ||
1296 | /* Reload PTE after unmap */ | |
1297 | vpte = be64_to_cpu(hptep[0]); | |
b5baa687 DG |
1298 | BUG_ON(vpte & HPTE_V_VALID); |
1299 | BUG_ON(!(vpte & HPTE_V_ABSENT)); | |
1300 | ||
1301 | ret = 0; | |
1302 | if (!(vpte & HPTE_V_BOLTED)) | |
1303 | goto out; | |
1304 | ||
1305 | rpte = be64_to_cpu(hptep[1]); | |
790a9df5 DG |
1306 | |
1307 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
1308 | vpte = hpte_new_to_old_v(vpte, rpte); | |
1309 | rpte = hpte_new_to_old_r(rpte); | |
1310 | } | |
1311 | ||
ded13fc1 PM |
1312 | pshift = kvmppc_hpte_base_page_shift(vpte, rpte); |
1313 | avpn = HPTE_V_AVPN_VAL(vpte) & ~(((1ul << pshift) - 1) >> 23); | |
b5baa687 DG |
1314 | pteg = idx / HPTES_PER_GROUP; |
1315 | if (vpte & HPTE_V_SECONDARY) | |
1316 | pteg = ~pteg; | |
1317 | ||
1318 | if (!(vpte & HPTE_V_1TB_SEG)) { | |
1319 | unsigned long offset, vsid; | |
1320 | ||
1321 | /* We only have 28 - 23 bits of offset in avpn */ | |
1322 | offset = (avpn & 0x1f) << 23; | |
1323 | vsid = avpn >> 5; | |
1324 | /* We can find more bits from the pteg value */ | |
ded13fc1 PM |
1325 | if (pshift < 23) |
1326 | offset |= ((vsid ^ pteg) & old_hash_mask) << pshift; | |
b5baa687 | 1327 | |
ded13fc1 | 1328 | hash = vsid ^ (offset >> pshift); |
b5baa687 DG |
1329 | } else { |
1330 | unsigned long offset, vsid; | |
1331 | ||
1332 | /* We only have 40 - 23 bits of seg_off in avpn */ | |
1333 | offset = (avpn & 0x1ffff) << 23; | |
1334 | vsid = avpn >> 17; | |
ded13fc1 PM |
1335 | if (pshift < 23) |
1336 | offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) << pshift; | |
b5baa687 | 1337 | |
ded13fc1 | 1338 | hash = vsid ^ (vsid << 25) ^ (offset >> pshift); |
b5baa687 DG |
1339 | } |
1340 | ||
1341 | new_pteg = hash & new_hash_mask; | |
05f2bb03 PM |
1342 | if (vpte & HPTE_V_SECONDARY) |
1343 | new_pteg = ~hash & new_hash_mask; | |
b5baa687 DG |
1344 | |
1345 | new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP); | |
1346 | new_hptep = (__be64 *)(new->virt + (new_idx << 4)); | |
1347 | ||
1348 | replace_vpte = be64_to_cpu(new_hptep[0]); | |
790a9df5 DG |
1349 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1350 | unsigned long replace_rpte = be64_to_cpu(new_hptep[1]); | |
1351 | replace_vpte = hpte_new_to_old_v(replace_vpte, replace_rpte); | |
1352 | } | |
b5baa687 DG |
1353 | |
1354 | if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
1355 | BUG_ON(new->order >= old->order); | |
1356 | ||
1357 | if (replace_vpte & HPTE_V_BOLTED) { | |
1358 | if (vpte & HPTE_V_BOLTED) | |
1359 | /* Bolted collision, nothing we can do */ | |
1360 | ret = -ENOSPC; | |
1361 | /* Discard the new HPTE */ | |
1362 | goto out; | |
1363 | } | |
1364 | ||
1365 | /* Discard the previous HPTE */ | |
1366 | } | |
1367 | ||
790a9df5 DG |
1368 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1369 | rpte = hpte_old_to_new_r(vpte, rpte); | |
1370 | vpte = hpte_old_to_new_v(vpte); | |
1371 | } | |
1372 | ||
b5baa687 DG |
1373 | new_hptep[1] = cpu_to_be64(rpte); |
1374 | new->rev[new_idx].guest_rpte = guest_rpte; | |
1375 | /* No need for a barrier, since new HPT isn't active */ | |
1376 | new_hptep[0] = cpu_to_be64(vpte); | |
1377 | unlock_hpte(new_hptep, vpte); | |
1378 | ||
1379 | out: | |
1380 | unlock_hpte(hptep, vpte); | |
1381 | return ret; | |
1382 | } | |
1383 | ||
5e985969 DG |
1384 | static int resize_hpt_rehash(struct kvm_resize_hpt *resize) |
1385 | { | |
b5baa687 DG |
1386 | struct kvm *kvm = resize->kvm; |
1387 | unsigned long i; | |
1388 | int rc; | |
1389 | ||
1390 | for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) { | |
1391 | rc = resize_hpt_rehash_hpte(resize, i); | |
1392 | if (rc != 0) | |
1393 | return rc; | |
1394 | } | |
1395 | ||
1396 | return 0; | |
5e985969 DG |
1397 | } |
1398 | ||
1399 | static void resize_hpt_pivot(struct kvm_resize_hpt *resize) | |
1400 | { | |
b5baa687 DG |
1401 | struct kvm *kvm = resize->kvm; |
1402 | struct kvm_hpt_info hpt_tmp; | |
1403 | ||
1404 | /* Exchange the pending tables in the resize structure with | |
1405 | * the active tables */ | |
1406 | ||
1407 | resize_hpt_debug(resize, "resize_hpt_pivot()\n"); | |
1408 | ||
1409 | spin_lock(&kvm->mmu_lock); | |
1410 | asm volatile("ptesync" : : : "memory"); | |
1411 | ||
1412 | hpt_tmp = kvm->arch.hpt; | |
1413 | kvmppc_set_hpt(kvm, &resize->hpt); | |
1414 | resize->hpt = hpt_tmp; | |
1415 | ||
1416 | spin_unlock(&kvm->mmu_lock); | |
1417 | ||
1418 | synchronize_srcu_expedited(&kvm->srcu); | |
1419 | ||
790a9df5 DG |
1420 | if (cpu_has_feature(CPU_FTR_ARCH_300)) |
1421 | kvmppc_setup_partition_table(kvm); | |
1422 | ||
b5baa687 | 1423 | resize_hpt_debug(resize, "resize_hpt_pivot() done\n"); |
5e985969 DG |
1424 | } |
1425 | ||
1426 | static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize) | |
1427 | { | |
0d4ee88d | 1428 | if (WARN_ON(!mutex_is_locked(&kvm->arch.mmu_setup_lock))) |
4ed11aee | 1429 | return; |
b5baa687 | 1430 | |
5b73d634 DG |
1431 | if (!resize) |
1432 | return; | |
1433 | ||
4ed11aee SP |
1434 | if (resize->error != -EBUSY) { |
1435 | if (resize->hpt.virt) | |
1436 | kvmppc_free_hpt(&resize->hpt); | |
1437 | kfree(resize); | |
1438 | } | |
b5baa687 | 1439 | |
4ed11aee SP |
1440 | if (kvm->arch.resize_hpt == resize) |
1441 | kvm->arch.resize_hpt = NULL; | |
5e985969 DG |
1442 | } |
1443 | ||
1444 | static void resize_hpt_prepare_work(struct work_struct *work) | |
1445 | { | |
1446 | struct kvm_resize_hpt *resize = container_of(work, | |
1447 | struct kvm_resize_hpt, | |
1448 | work); | |
1449 | struct kvm *kvm = resize->kvm; | |
4ed11aee | 1450 | int err = 0; |
5e985969 | 1451 | |
3073774e SP |
1452 | if (WARN_ON(resize->error != -EBUSY)) |
1453 | return; | |
1454 | ||
0d4ee88d | 1455 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 | 1456 | |
4ed11aee SP |
1457 | /* Request is still current? */ |
1458 | if (kvm->arch.resize_hpt == resize) { | |
1459 | /* We may request large allocations here: | |
0d4ee88d | 1460 | * do not sleep with kvm->arch.mmu_setup_lock held for a while. |
4ed11aee | 1461 | */ |
0d4ee88d | 1462 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 | 1463 | |
4ed11aee SP |
1464 | resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n", |
1465 | resize->order); | |
3073774e | 1466 | |
4ed11aee SP |
1467 | err = resize_hpt_allocate(resize); |
1468 | ||
1469 | /* We have strict assumption about -EBUSY | |
1470 | * when preparing for HPT resize. | |
1471 | */ | |
1472 | if (WARN_ON(err == -EBUSY)) | |
1473 | err = -EINPROGRESS; | |
1474 | ||
0d4ee88d | 1475 | mutex_lock(&kvm->arch.mmu_setup_lock); |
4ed11aee | 1476 | /* It is possible that kvm->arch.resize_hpt != resize |
0d4ee88d | 1477 | * after we grab kvm->arch.mmu_setup_lock again. |
4ed11aee SP |
1478 | */ |
1479 | } | |
5e985969 DG |
1480 | |
1481 | resize->error = err; | |
5e985969 | 1482 | |
4ed11aee SP |
1483 | if (kvm->arch.resize_hpt != resize) |
1484 | resize_hpt_release(kvm, resize); | |
1485 | ||
0d4ee88d | 1486 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1487 | } |
1488 | ||
1489 | long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm, | |
1490 | struct kvm_ppc_resize_hpt *rhpt) | |
1491 | { | |
1492 | unsigned long flags = rhpt->flags; | |
1493 | unsigned long shift = rhpt->shift; | |
1494 | struct kvm_resize_hpt *resize; | |
1495 | int ret; | |
1496 | ||
891f1ebf | 1497 | if (flags != 0 || kvm_is_radix(kvm)) |
5e985969 DG |
1498 | return -EINVAL; |
1499 | ||
1500 | if (shift && ((shift < 18) || (shift > 46))) | |
1501 | return -EINVAL; | |
1502 | ||
0d4ee88d | 1503 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1504 | |
1505 | resize = kvm->arch.resize_hpt; | |
1506 | ||
1507 | if (resize) { | |
1508 | if (resize->order == shift) { | |
3073774e SP |
1509 | /* Suitable resize in progress? */ |
1510 | ret = resize->error; | |
1511 | if (ret == -EBUSY) | |
5e985969 | 1512 | ret = 100; /* estimated time in ms */ |
3073774e SP |
1513 | else if (ret) |
1514 | resize_hpt_release(kvm, resize); | |
5e985969 DG |
1515 | |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | /* not suitable, cancel it */ | |
1520 | resize_hpt_release(kvm, resize); | |
1521 | } | |
1522 | ||
1523 | ret = 0; | |
1524 | if (!shift) | |
1525 | goto out; /* nothing to do */ | |
1526 | ||
1527 | /* start new resize */ | |
1528 | ||
1529 | resize = kzalloc(sizeof(*resize), GFP_KERNEL); | |
abd80dcb DC |
1530 | if (!resize) { |
1531 | ret = -ENOMEM; | |
1532 | goto out; | |
1533 | } | |
3073774e SP |
1534 | |
1535 | resize->error = -EBUSY; | |
5e985969 DG |
1536 | resize->order = shift; |
1537 | resize->kvm = kvm; | |
1538 | INIT_WORK(&resize->work, resize_hpt_prepare_work); | |
1539 | kvm->arch.resize_hpt = resize; | |
1540 | ||
1541 | schedule_work(&resize->work); | |
1542 | ||
1543 | ret = 100; /* estimated time in ms */ | |
1544 | ||
1545 | out: | |
0d4ee88d | 1546 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1547 | return ret; |
1548 | } | |
1549 | ||
1550 | static void resize_hpt_boot_vcpu(void *opaque) | |
1551 | { | |
1552 | /* Nothing to do, just force a KVM exit */ | |
1553 | } | |
1554 | ||
1555 | long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, | |
1556 | struct kvm_ppc_resize_hpt *rhpt) | |
1557 | { | |
1558 | unsigned long flags = rhpt->flags; | |
1559 | unsigned long shift = rhpt->shift; | |
1560 | struct kvm_resize_hpt *resize; | |
1561 | long ret; | |
1562 | ||
891f1ebf | 1563 | if (flags != 0 || kvm_is_radix(kvm)) |
5e985969 DG |
1564 | return -EINVAL; |
1565 | ||
1566 | if (shift && ((shift < 18) || (shift > 46))) | |
1567 | return -EINVAL; | |
1568 | ||
0d4ee88d | 1569 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1570 | |
1571 | resize = kvm->arch.resize_hpt; | |
1572 | ||
1573 | /* This shouldn't be possible */ | |
1574 | ret = -EIO; | |
1b151ce4 | 1575 | if (WARN_ON(!kvm->arch.mmu_ready)) |
5e985969 DG |
1576 | goto out_no_hpt; |
1577 | ||
1578 | /* Stop VCPUs from running while we mess with the HPT */ | |
1b151ce4 | 1579 | kvm->arch.mmu_ready = 0; |
5e985969 DG |
1580 | smp_mb(); |
1581 | ||
1582 | /* Boot all CPUs out of the guest so they re-read | |
1b151ce4 | 1583 | * mmu_ready */ |
5e985969 DG |
1584 | on_each_cpu(resize_hpt_boot_vcpu, NULL, 1); |
1585 | ||
1586 | ret = -ENXIO; | |
1587 | if (!resize || (resize->order != shift)) | |
1588 | goto out; | |
1589 | ||
5e985969 | 1590 | ret = resize->error; |
3073774e | 1591 | if (ret) |
5e985969 DG |
1592 | goto out; |
1593 | ||
1594 | ret = resize_hpt_rehash(resize); | |
3073774e | 1595 | if (ret) |
5e985969 DG |
1596 | goto out; |
1597 | ||
1598 | resize_hpt_pivot(resize); | |
1599 | ||
1600 | out: | |
1601 | /* Let VCPUs run again */ | |
1b151ce4 | 1602 | kvm->arch.mmu_ready = 1; |
5e985969 DG |
1603 | smp_mb(); |
1604 | out_no_hpt: | |
1605 | resize_hpt_release(kvm, resize); | |
0d4ee88d | 1606 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1607 | return ret; |
1608 | } | |
1609 | ||
a2932923 PM |
1610 | /* |
1611 | * Functions for reading and writing the hash table via reads and | |
1612 | * writes on a file descriptor. | |
1613 | * | |
1614 | * Reads return the guest view of the hash table, which has to be | |
1615 | * pieced together from the real hash table and the guest_rpte | |
1616 | * values in the revmap array. | |
1617 | * | |
1618 | * On writes, each HPTE written is considered in turn, and if it | |
1619 | * is valid, it is written to the HPT as if an H_ENTER with the | |
1620 | * exact flag set was done. When the invalid count is non-zero | |
1621 | * in the header written to the stream, the kernel will make | |
1622 | * sure that that many HPTEs are invalid, and invalidate them | |
1623 | * if not. | |
1624 | */ | |
1625 | ||
1626 | struct kvm_htab_ctx { | |
1627 | unsigned long index; | |
1628 | unsigned long flags; | |
1629 | struct kvm *kvm; | |
1630 | int first_pass; | |
1631 | }; | |
1632 | ||
1633 | #define HPTE_SIZE (2 * sizeof(unsigned long)) | |
1634 | ||
a1b4a0f6 PM |
1635 | /* |
1636 | * Returns 1 if this HPT entry has been modified or has pending | |
1637 | * R/C bit changes. | |
1638 | */ | |
6f22bd32 | 1639 | static int hpte_dirty(struct revmap_entry *revp, __be64 *hptp) |
a1b4a0f6 PM |
1640 | { |
1641 | unsigned long rcbits_unset; | |
1642 | ||
1643 | if (revp->guest_rpte & HPTE_GR_MODIFIED) | |
1644 | return 1; | |
1645 | ||
1646 | /* Also need to consider changes in reference and changed bits */ | |
1647 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
6f22bd32 AG |
1648 | if ((be64_to_cpu(hptp[0]) & HPTE_V_VALID) && |
1649 | (be64_to_cpu(hptp[1]) & rcbits_unset)) | |
a1b4a0f6 PM |
1650 | return 1; |
1651 | ||
1652 | return 0; | |
1653 | } | |
1654 | ||
6f22bd32 | 1655 | static long record_hpte(unsigned long flags, __be64 *hptp, |
a2932923 PM |
1656 | unsigned long *hpte, struct revmap_entry *revp, |
1657 | int want_valid, int first_pass) | |
1658 | { | |
abb7c7dd | 1659 | unsigned long v, r, hr; |
a1b4a0f6 | 1660 | unsigned long rcbits_unset; |
a2932923 PM |
1661 | int ok = 1; |
1662 | int valid, dirty; | |
1663 | ||
1664 | /* Unmodified entries are uninteresting except on the first pass */ | |
a1b4a0f6 | 1665 | dirty = hpte_dirty(revp, hptp); |
a2932923 PM |
1666 | if (!first_pass && !dirty) |
1667 | return 0; | |
1668 | ||
1669 | valid = 0; | |
6f22bd32 | 1670 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
a2932923 PM |
1671 | valid = 1; |
1672 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && | |
6f22bd32 | 1673 | !(be64_to_cpu(hptp[0]) & HPTE_V_BOLTED)) |
a2932923 PM |
1674 | valid = 0; |
1675 | } | |
1676 | if (valid != want_valid) | |
1677 | return 0; | |
1678 | ||
1679 | v = r = 0; | |
1680 | if (valid || dirty) { | |
1681 | /* lock the HPTE so it's stable and read it */ | |
1682 | preempt_disable(); | |
1683 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
1684 | cpu_relax(); | |
6f22bd32 | 1685 | v = be64_to_cpu(hptp[0]); |
abb7c7dd PM |
1686 | hr = be64_to_cpu(hptp[1]); |
1687 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
1688 | v = hpte_new_to_old_v(v, hr); | |
1689 | hr = hpte_new_to_old_r(hr); | |
1690 | } | |
a1b4a0f6 PM |
1691 | |
1692 | /* re-evaluate valid and dirty from synchronized HPTE value */ | |
1693 | valid = !!(v & HPTE_V_VALID); | |
1694 | dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED); | |
1695 | ||
1696 | /* Harvest R and C into guest view if necessary */ | |
1697 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
abb7c7dd PM |
1698 | if (valid && (rcbits_unset & hr)) { |
1699 | revp->guest_rpte |= (hr & | |
6f22bd32 | 1700 | (HPTE_R_R | HPTE_R_C)) | HPTE_GR_MODIFIED; |
a1b4a0f6 PM |
1701 | dirty = 1; |
1702 | } | |
1703 | ||
a2932923 PM |
1704 | if (v & HPTE_V_ABSENT) { |
1705 | v &= ~HPTE_V_ABSENT; | |
1706 | v |= HPTE_V_VALID; | |
a1b4a0f6 | 1707 | valid = 1; |
a2932923 | 1708 | } |
a2932923 PM |
1709 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED)) |
1710 | valid = 0; | |
a1b4a0f6 PM |
1711 | |
1712 | r = revp->guest_rpte; | |
a2932923 PM |
1713 | /* only clear modified if this is the right sort of entry */ |
1714 | if (valid == want_valid && dirty) { | |
1715 | r &= ~HPTE_GR_MODIFIED; | |
1716 | revp->guest_rpte = r; | |
1717 | } | |
a4bd6eb0 | 1718 | unlock_hpte(hptp, be64_to_cpu(hptp[0])); |
a2932923 PM |
1719 | preempt_enable(); |
1720 | if (!(valid == want_valid && (first_pass || dirty))) | |
1721 | ok = 0; | |
1722 | } | |
6f22bd32 AG |
1723 | hpte[0] = cpu_to_be64(v); |
1724 | hpte[1] = cpu_to_be64(r); | |
a2932923 PM |
1725 | return ok; |
1726 | } | |
1727 | ||
1728 | static ssize_t kvm_htab_read(struct file *file, char __user *buf, | |
1729 | size_t count, loff_t *ppos) | |
1730 | { | |
1731 | struct kvm_htab_ctx *ctx = file->private_data; | |
1732 | struct kvm *kvm = ctx->kvm; | |
1733 | struct kvm_get_htab_header hdr; | |
6f22bd32 | 1734 | __be64 *hptp; |
a2932923 PM |
1735 | struct revmap_entry *revp; |
1736 | unsigned long i, nb, nw; | |
1737 | unsigned long __user *lbuf; | |
1738 | struct kvm_get_htab_header __user *hptr; | |
1739 | unsigned long flags; | |
1740 | int first_pass; | |
1741 | unsigned long hpte[2]; | |
1742 | ||
96d4f267 | 1743 | if (!access_ok(buf, count)) |
a2932923 | 1744 | return -EFAULT; |
891f1ebf PM |
1745 | if (kvm_is_radix(kvm)) |
1746 | return 0; | |
a2932923 PM |
1747 | |
1748 | first_pass = ctx->first_pass; | |
1749 | flags = ctx->flags; | |
1750 | ||
1751 | i = ctx->index; | |
3f9d4f5a DG |
1752 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
1753 | revp = kvm->arch.hpt.rev + i; | |
a2932923 PM |
1754 | lbuf = (unsigned long __user *)buf; |
1755 | ||
1756 | nb = 0; | |
1757 | while (nb + sizeof(hdr) + HPTE_SIZE < count) { | |
1758 | /* Initialize header */ | |
1759 | hptr = (struct kvm_get_htab_header __user *)buf; | |
a2932923 PM |
1760 | hdr.n_valid = 0; |
1761 | hdr.n_invalid = 0; | |
1762 | nw = nb; | |
1763 | nb += sizeof(hdr); | |
1764 | lbuf = (unsigned long __user *)(buf + sizeof(hdr)); | |
1765 | ||
1766 | /* Skip uninteresting entries, i.e. clean on not-first pass */ | |
1767 | if (!first_pass) { | |
3d089f84 | 1768 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a1b4a0f6 | 1769 | !hpte_dirty(revp, hptp)) { |
a2932923 PM |
1770 | ++i; |
1771 | hptp += 2; | |
1772 | ++revp; | |
1773 | } | |
1774 | } | |
05dd85f7 | 1775 | hdr.index = i; |
a2932923 PM |
1776 | |
1777 | /* Grab a series of valid entries */ | |
3d089f84 | 1778 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1779 | hdr.n_valid < 0xffff && |
1780 | nb + HPTE_SIZE < count && | |
1781 | record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { | |
1782 | /* valid entry, write it out */ | |
1783 | ++hdr.n_valid; | |
1784 | if (__put_user(hpte[0], lbuf) || | |
1785 | __put_user(hpte[1], lbuf + 1)) | |
1786 | return -EFAULT; | |
1787 | nb += HPTE_SIZE; | |
1788 | lbuf += 2; | |
1789 | ++i; | |
1790 | hptp += 2; | |
1791 | ++revp; | |
1792 | } | |
1793 | /* Now skip invalid entries while we can */ | |
3d089f84 | 1794 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1795 | hdr.n_invalid < 0xffff && |
1796 | record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { | |
1797 | /* found an invalid entry */ | |
1798 | ++hdr.n_invalid; | |
1799 | ++i; | |
1800 | hptp += 2; | |
1801 | ++revp; | |
1802 | } | |
1803 | ||
1804 | if (hdr.n_valid || hdr.n_invalid) { | |
1805 | /* write back the header */ | |
1806 | if (__copy_to_user(hptr, &hdr, sizeof(hdr))) | |
1807 | return -EFAULT; | |
1808 | nw = nb; | |
1809 | buf = (char __user *)lbuf; | |
1810 | } else { | |
1811 | nb = nw; | |
1812 | } | |
1813 | ||
1814 | /* Check if we've wrapped around the hash table */ | |
3d089f84 | 1815 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) { |
a2932923 PM |
1816 | i = 0; |
1817 | ctx->first_pass = 0; | |
1818 | break; | |
1819 | } | |
1820 | } | |
1821 | ||
1822 | ctx->index = i; | |
1823 | ||
1824 | return nb; | |
1825 | } | |
1826 | ||
1827 | static ssize_t kvm_htab_write(struct file *file, const char __user *buf, | |
1828 | size_t count, loff_t *ppos) | |
1829 | { | |
1830 | struct kvm_htab_ctx *ctx = file->private_data; | |
1831 | struct kvm *kvm = ctx->kvm; | |
1832 | struct kvm_get_htab_header hdr; | |
1833 | unsigned long i, j; | |
1834 | unsigned long v, r; | |
1835 | unsigned long __user *lbuf; | |
6f22bd32 | 1836 | __be64 *hptp; |
a2932923 PM |
1837 | unsigned long tmp[2]; |
1838 | ssize_t nb; | |
1839 | long int err, ret; | |
1b151ce4 | 1840 | int mmu_ready; |
ded13fc1 | 1841 | int pshift; |
a2932923 | 1842 | |
96d4f267 | 1843 | if (!access_ok(buf, count)) |
a2932923 | 1844 | return -EFAULT; |
891f1ebf PM |
1845 | if (kvm_is_radix(kvm)) |
1846 | return -EINVAL; | |
a2932923 PM |
1847 | |
1848 | /* lock out vcpus from running while we're doing this */ | |
0d4ee88d | 1849 | mutex_lock(&kvm->arch.mmu_setup_lock); |
1b151ce4 PM |
1850 | mmu_ready = kvm->arch.mmu_ready; |
1851 | if (mmu_ready) { | |
1852 | kvm->arch.mmu_ready = 0; /* temporarily */ | |
1853 | /* order mmu_ready vs. vcpus_running */ | |
a2932923 PM |
1854 | smp_mb(); |
1855 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1b151ce4 | 1856 | kvm->arch.mmu_ready = 1; |
0d4ee88d | 1857 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
a2932923 PM |
1858 | return -EBUSY; |
1859 | } | |
1860 | } | |
1861 | ||
1862 | err = 0; | |
1863 | for (nb = 0; nb + sizeof(hdr) <= count; ) { | |
1864 | err = -EFAULT; | |
1865 | if (__copy_from_user(&hdr, buf, sizeof(hdr))) | |
1866 | break; | |
1867 | ||
1868 | err = 0; | |
1869 | if (nb + hdr.n_valid * HPTE_SIZE > count) | |
1870 | break; | |
1871 | ||
1872 | nb += sizeof(hdr); | |
1873 | buf += sizeof(hdr); | |
1874 | ||
1875 | err = -EINVAL; | |
1876 | i = hdr.index; | |
3d089f84 DG |
1877 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) || |
1878 | i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt)) | |
a2932923 PM |
1879 | break; |
1880 | ||
3f9d4f5a | 1881 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
a2932923 PM |
1882 | lbuf = (unsigned long __user *)buf; |
1883 | for (j = 0; j < hdr.n_valid; ++j) { | |
ffada016 CLG |
1884 | __be64 hpte_v; |
1885 | __be64 hpte_r; | |
1886 | ||
a2932923 | 1887 | err = -EFAULT; |
ffada016 CLG |
1888 | if (__get_user(hpte_v, lbuf) || |
1889 | __get_user(hpte_r, lbuf + 1)) | |
a2932923 | 1890 | goto out; |
ffada016 CLG |
1891 | v = be64_to_cpu(hpte_v); |
1892 | r = be64_to_cpu(hpte_r); | |
a2932923 PM |
1893 | err = -EINVAL; |
1894 | if (!(v & HPTE_V_VALID)) | |
1895 | goto out; | |
ded13fc1 PM |
1896 | pshift = kvmppc_hpte_base_page_shift(v, r); |
1897 | if (pshift <= 0) | |
1898 | goto out; | |
a2932923 PM |
1899 | lbuf += 2; |
1900 | nb += HPTE_SIZE; | |
1901 | ||
6f22bd32 | 1902 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1903 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1904 | err = -EIO; | |
1905 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r, | |
1906 | tmp); | |
1907 | if (ret != H_SUCCESS) { | |
1908 | pr_err("kvm_htab_write ret %ld i=%ld v=%lx " | |
1909 | "r=%lx\n", ret, i, v, r); | |
1910 | goto out; | |
1911 | } | |
1b151ce4 | 1912 | if (!mmu_ready && is_vrma_hpte(v)) { |
ded13fc1 | 1913 | unsigned long senc, lpcr; |
a2932923 | 1914 | |
ded13fc1 | 1915 | senc = slb_pgsize_encoding(1ul << pshift); |
a2932923 PM |
1916 | kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | |
1917 | (VRMA_VSID << SLB_VSID_SHIFT_1T); | |
ded13fc1 PM |
1918 | if (!cpu_has_feature(CPU_FTR_ARCH_300)) { |
1919 | lpcr = senc << (LPCR_VRMASD_SH - 4); | |
1920 | kvmppc_update_lpcr(kvm, lpcr, | |
1921 | LPCR_VRMASD); | |
1922 | } else { | |
1923 | kvmppc_setup_partition_table(kvm); | |
1924 | } | |
1b151ce4 | 1925 | mmu_ready = 1; |
a2932923 PM |
1926 | } |
1927 | ++i; | |
1928 | hptp += 2; | |
1929 | } | |
1930 | ||
1931 | for (j = 0; j < hdr.n_invalid; ++j) { | |
6f22bd32 | 1932 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1933 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1934 | ++i; | |
1935 | hptp += 2; | |
1936 | } | |
1937 | err = 0; | |
1938 | } | |
1939 | ||
1940 | out: | |
1b151ce4 | 1941 | /* Order HPTE updates vs. mmu_ready */ |
a2932923 | 1942 | smp_wmb(); |
1b151ce4 | 1943 | kvm->arch.mmu_ready = mmu_ready; |
0d4ee88d | 1944 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
a2932923 PM |
1945 | |
1946 | if (err) | |
1947 | return err; | |
1948 | return nb; | |
1949 | } | |
1950 | ||
1951 | static int kvm_htab_release(struct inode *inode, struct file *filp) | |
1952 | { | |
1953 | struct kvm_htab_ctx *ctx = filp->private_data; | |
1954 | ||
1955 | filp->private_data = NULL; | |
1956 | if (!(ctx->flags & KVM_GET_HTAB_WRITE)) | |
1957 | atomic_dec(&ctx->kvm->arch.hpte_mod_interest); | |
1958 | kvm_put_kvm(ctx->kvm); | |
1959 | kfree(ctx); | |
1960 | return 0; | |
1961 | } | |
1962 | ||
75ef9de1 | 1963 | static const struct file_operations kvm_htab_fops = { |
a2932923 PM |
1964 | .read = kvm_htab_read, |
1965 | .write = kvm_htab_write, | |
1966 | .llseek = default_llseek, | |
1967 | .release = kvm_htab_release, | |
1968 | }; | |
1969 | ||
1970 | int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf) | |
1971 | { | |
1972 | int ret; | |
1973 | struct kvm_htab_ctx *ctx; | |
1974 | int rwflag; | |
1975 | ||
1976 | /* reject flags we don't recognize */ | |
1977 | if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE)) | |
1978 | return -EINVAL; | |
1979 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1980 | if (!ctx) | |
1981 | return -ENOMEM; | |
1982 | kvm_get_kvm(kvm); | |
1983 | ctx->kvm = kvm; | |
1984 | ctx->index = ghf->start_index; | |
1985 | ctx->flags = ghf->flags; | |
1986 | ctx->first_pass = 1; | |
1987 | ||
1988 | rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; | |
2f84d5ea | 1989 | ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC); |
a2932923 | 1990 | if (ret < 0) { |
43f6b0cf | 1991 | kfree(ctx); |
149487bd | 1992 | kvm_put_kvm_no_destroy(kvm); |
a2932923 PM |
1993 | return ret; |
1994 | } | |
1995 | ||
1996 | if (rwflag == O_RDONLY) { | |
1997 | mutex_lock(&kvm->slots_lock); | |
1998 | atomic_inc(&kvm->arch.hpte_mod_interest); | |
1999 | /* make sure kvmppc_do_h_enter etc. see the increment */ | |
2000 | synchronize_srcu_expedited(&kvm->srcu); | |
2001 | mutex_unlock(&kvm->slots_lock); | |
2002 | } | |
2003 | ||
2004 | return ret; | |
2005 | } | |
2006 | ||
e23a808b PM |
2007 | struct debugfs_htab_state { |
2008 | struct kvm *kvm; | |
2009 | struct mutex mutex; | |
2010 | unsigned long hpt_index; | |
2011 | int chars_left; | |
2012 | int buf_index; | |
2013 | char buf[64]; | |
2014 | }; | |
2015 | ||
2016 | static int debugfs_htab_open(struct inode *inode, struct file *file) | |
2017 | { | |
2018 | struct kvm *kvm = inode->i_private; | |
2019 | struct debugfs_htab_state *p; | |
2020 | ||
2021 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
2022 | if (!p) | |
2023 | return -ENOMEM; | |
2024 | ||
2025 | kvm_get_kvm(kvm); | |
2026 | p->kvm = kvm; | |
2027 | mutex_init(&p->mutex); | |
2028 | file->private_data = p; | |
2029 | ||
2030 | return nonseekable_open(inode, file); | |
2031 | } | |
2032 | ||
2033 | static int debugfs_htab_release(struct inode *inode, struct file *file) | |
2034 | { | |
2035 | struct debugfs_htab_state *p = file->private_data; | |
2036 | ||
2037 | kvm_put_kvm(p->kvm); | |
2038 | kfree(p); | |
2039 | return 0; | |
2040 | } | |
2041 | ||
2042 | static ssize_t debugfs_htab_read(struct file *file, char __user *buf, | |
2043 | size_t len, loff_t *ppos) | |
2044 | { | |
2045 | struct debugfs_htab_state *p = file->private_data; | |
2046 | ssize_t ret, r; | |
2047 | unsigned long i, n; | |
2048 | unsigned long v, hr, gr; | |
2049 | struct kvm *kvm; | |
2050 | __be64 *hptp; | |
2051 | ||
891f1ebf PM |
2052 | kvm = p->kvm; |
2053 | if (kvm_is_radix(kvm)) | |
2054 | return 0; | |
2055 | ||
e23a808b PM |
2056 | ret = mutex_lock_interruptible(&p->mutex); |
2057 | if (ret) | |
2058 | return ret; | |
2059 | ||
2060 | if (p->chars_left) { | |
2061 | n = p->chars_left; | |
2062 | if (n > len) | |
2063 | n = len; | |
2064 | r = copy_to_user(buf, p->buf + p->buf_index, n); | |
2065 | n -= r; | |
2066 | p->chars_left -= n; | |
2067 | p->buf_index += n; | |
2068 | buf += n; | |
2069 | len -= n; | |
2070 | ret = n; | |
2071 | if (r) { | |
2072 | if (!n) | |
2073 | ret = -EFAULT; | |
2074 | goto out; | |
2075 | } | |
2076 | } | |
2077 | ||
e23a808b | 2078 | i = p->hpt_index; |
3f9d4f5a | 2079 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
3d089f84 DG |
2080 | for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt); |
2081 | ++i, hptp += 2) { | |
e23a808b PM |
2082 | if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))) |
2083 | continue; | |
2084 | ||
2085 | /* lock the HPTE so it's stable and read it */ | |
2086 | preempt_disable(); | |
2087 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
2088 | cpu_relax(); | |
2089 | v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK; | |
2090 | hr = be64_to_cpu(hptp[1]); | |
3f9d4f5a | 2091 | gr = kvm->arch.hpt.rev[i].guest_rpte; |
e23a808b PM |
2092 | unlock_hpte(hptp, v); |
2093 | preempt_enable(); | |
2094 | ||
2095 | if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT))) | |
2096 | continue; | |
2097 | ||
2098 | n = scnprintf(p->buf, sizeof(p->buf), | |
2099 | "%6lx %.16lx %.16lx %.16lx\n", | |
2100 | i, v, hr, gr); | |
2101 | p->chars_left = n; | |
2102 | if (n > len) | |
2103 | n = len; | |
2104 | r = copy_to_user(buf, p->buf, n); | |
2105 | n -= r; | |
2106 | p->chars_left -= n; | |
2107 | p->buf_index = n; | |
2108 | buf += n; | |
2109 | len -= n; | |
2110 | ret += n; | |
2111 | if (r) { | |
2112 | if (!ret) | |
2113 | ret = -EFAULT; | |
2114 | goto out; | |
2115 | } | |
2116 | } | |
2117 | p->hpt_index = i; | |
2118 | ||
2119 | out: | |
2120 | mutex_unlock(&p->mutex); | |
2121 | return ret; | |
2122 | } | |
2123 | ||
025c9511 | 2124 | static ssize_t debugfs_htab_write(struct file *file, const char __user *buf, |
e23a808b PM |
2125 | size_t len, loff_t *ppos) |
2126 | { | |
2127 | return -EACCES; | |
2128 | } | |
2129 | ||
2130 | static const struct file_operations debugfs_htab_fops = { | |
2131 | .owner = THIS_MODULE, | |
2132 | .open = debugfs_htab_open, | |
2133 | .release = debugfs_htab_release, | |
2134 | .read = debugfs_htab_read, | |
2135 | .write = debugfs_htab_write, | |
2136 | .llseek = generic_file_llseek, | |
2137 | }; | |
2138 | ||
2139 | void kvmppc_mmu_debugfs_init(struct kvm *kvm) | |
2140 | { | |
c4fd527f GKH |
2141 | debugfs_create_file("htab", 0400, kvm->arch.debugfs_dir, kvm, |
2142 | &debugfs_htab_fops); | |
e23a808b PM |
2143 | } |
2144 | ||
de56a948 PM |
2145 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
2146 | { | |
2147 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
2148 | ||
c17b98cf | 2149 | vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */ |
de56a948 | 2150 | |
18c3640c | 2151 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; |
de56a948 PM |
2152 | |
2153 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
2154 | } |