Commit | Line | Data |
---|---|---|
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" |
6de2e837 | 31 | #include "book3s_hv.h" |
3c78f78a SW |
32 | #include "trace_hv.h" |
33 | ||
5e985969 DG |
34 | //#define DEBUG_RESIZE_HPT 1 |
35 | ||
36 | #ifdef DEBUG_RESIZE_HPT | |
37 | #define resize_hpt_debug(resize, ...) \ | |
38 | do { \ | |
39 | printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \ | |
40 | printk(__VA_ARGS__); \ | |
41 | } while (0) | |
42 | #else | |
43 | #define resize_hpt_debug(resize, ...) \ | |
44 | do { } while (0) | |
45 | #endif | |
46 | ||
7ed661bf PM |
47 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
48 | long pte_index, unsigned long pteh, | |
49 | unsigned long ptel, unsigned long *pte_idx_ret); | |
5e985969 DG |
50 | |
51 | struct kvm_resize_hpt { | |
52 | /* These fields read-only after init */ | |
53 | struct kvm *kvm; | |
54 | struct work_struct work; | |
55 | u32 order; | |
56 | ||
0d4ee88d | 57 | /* These fields protected by kvm->arch.mmu_setup_lock */ |
3073774e SP |
58 | |
59 | /* Possible values and their usage: | |
60 | * <0 an error occurred during allocation, | |
61 | * -EBUSY allocation is in the progress, | |
1fd02f66 | 62 | * 0 allocation made successfully. |
3073774e | 63 | */ |
5e985969 | 64 | int error; |
b5baa687 | 65 | |
3073774e | 66 | /* Private to the work thread, until error != -EBUSY, |
0d4ee88d | 67 | * then protected by kvm->arch.mmu_setup_lock. |
3073774e | 68 | */ |
b5baa687 | 69 | struct kvm_hpt_info hpt; |
5e985969 DG |
70 | }; |
71 | ||
aae0777f | 72 | int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order) |
de56a948 | 73 | { |
792fc497 | 74 | unsigned long hpt = 0; |
aae0777f | 75 | int cma = 0; |
fa61a4e3 | 76 | struct page *page = NULL; |
aae0777f DG |
77 | struct revmap_entry *rev; |
78 | unsigned long npte; | |
de56a948 | 79 | |
aae0777f DG |
80 | if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER)) |
81 | return -EINVAL; | |
32fad281 | 82 | |
db9a290d | 83 | page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT)); |
792fc497 AK |
84 | if (page) { |
85 | hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page)); | |
02a68d05 | 86 | memset((void *)hpt, 0, (1ul << order)); |
aae0777f | 87 | cma = 1; |
de56a948 | 88 | } |
32fad281 | 89 | |
aae0777f | 90 | if (!hpt) |
dcda9b04 | 91 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_RETRY_MAYFAIL |
aae0777f | 92 | |__GFP_NOWARN, order - PAGE_SHIFT); |
32fad281 PM |
93 | |
94 | if (!hpt) | |
95 | return -ENOMEM; | |
96 | ||
aae0777f DG |
97 | /* HPTEs are 2**4 bytes long */ |
98 | npte = 1ul << (order - 4); | |
a56ee9f8 | 99 | |
8936dda4 | 100 | /* Allocate reverse map array */ |
42bc47b3 | 101 | rev = vmalloc(array_size(npte, sizeof(struct revmap_entry))); |
8936dda4 | 102 | if (!rev) { |
aae0777f DG |
103 | if (cma) |
104 | kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT)); | |
105 | else | |
106 | free_pages(hpt, order - PAGE_SHIFT); | |
107 | return -ENOMEM; | |
8936dda4 | 108 | } |
8936dda4 | 109 | |
aae0777f DG |
110 | info->order = order; |
111 | info->virt = hpt; | |
112 | info->cma = cma; | |
113 | info->rev = rev; | |
de56a948 | 114 | |
de56a948 | 115 | return 0; |
aae0777f | 116 | } |
8936dda4 | 117 | |
aae0777f DG |
118 | void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info) |
119 | { | |
120 | atomic64_set(&kvm->arch.mmio_update, 0); | |
121 | kvm->arch.hpt = *info; | |
122 | kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18); | |
123 | ||
dfcaacc8 | 124 | pr_debug("KVM guest htab at %lx (order %ld), LPID %llx\n", |
3a4f1760 | 125 | info->virt, (long)info->order, kvm->arch.lpid); |
de56a948 PM |
126 | } |
127 | ||
67c48662 | 128 | int kvmppc_alloc_reset_hpt(struct kvm *kvm, int order) |
32fad281 | 129 | { |
67c48662 | 130 | int err = -EBUSY; |
f98a8bf9 | 131 | struct kvm_hpt_info info; |
32fad281 | 132 | |
0d4ee88d | 133 | mutex_lock(&kvm->arch.mmu_setup_lock); |
1b151ce4 PM |
134 | if (kvm->arch.mmu_ready) { |
135 | kvm->arch.mmu_ready = 0; | |
136 | /* order mmu_ready vs. vcpus_running */ | |
32fad281 PM |
137 | smp_mb(); |
138 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1b151ce4 | 139 | kvm->arch.mmu_ready = 1; |
32fad281 PM |
140 | goto out; |
141 | } | |
142 | } | |
18c3640c PM |
143 | if (kvm_is_radix(kvm)) { |
144 | err = kvmppc_switch_mmu_to_hpt(kvm); | |
145 | if (err) | |
146 | goto out; | |
147 | } | |
148 | ||
f98a8bf9 DG |
149 | if (kvm->arch.hpt.order == order) { |
150 | /* We already have a suitable HPT */ | |
151 | ||
32fad281 | 152 | /* Set the entire HPT to 0, i.e. invalid HPTEs */ |
3f9d4f5a | 153 | memset((void *)kvm->arch.hpt.virt, 0, 1ul << order); |
a64fd707 PM |
154 | /* |
155 | * Reset all the reverse-mapping chains for all memslots | |
156 | */ | |
157 | kvmppc_rmap_reset(kvm); | |
32fad281 | 158 | err = 0; |
f98a8bf9 | 159 | goto out; |
32fad281 | 160 | } |
f98a8bf9 | 161 | |
ef427198 | 162 | if (kvm->arch.hpt.virt) { |
f98a8bf9 | 163 | kvmppc_free_hpt(&kvm->arch.hpt); |
ef427198 PM |
164 | kvmppc_rmap_reset(kvm); |
165 | } | |
f98a8bf9 DG |
166 | |
167 | err = kvmppc_allocate_hpt(&info, order); | |
168 | if (err < 0) | |
169 | goto out; | |
170 | kvmppc_set_hpt(kvm, &info); | |
171 | ||
172 | out: | |
ecba8297 DG |
173 | if (err == 0) |
174 | /* Ensure that each vcpu will flush its TLB on next entry. */ | |
175 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
176 | ||
0d4ee88d | 177 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
32fad281 PM |
178 | return err; |
179 | } | |
180 | ||
aae0777f | 181 | void kvmppc_free_hpt(struct kvm_hpt_info *info) |
de56a948 | 182 | { |
aae0777f | 183 | vfree(info->rev); |
18c3640c | 184 | info->rev = NULL; |
aae0777f | 185 | if (info->cma) |
58b6fed8 | 186 | kvm_free_hpt_cma(virt_to_page((void *)info->virt), |
aae0777f DG |
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 | { | |
5d506f15 | 260 | unsigned long nr_lpids; |
9e368f29 | 261 | |
b7557451 NP |
262 | if (!mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE)) |
263 | return -EINVAL; | |
264 | ||
18827eee NP |
265 | if (cpu_has_feature(CPU_FTR_HVMODE)) { |
266 | if (WARN_ON(mfspr(SPRN_LPID) != 0)) | |
267 | return -EINVAL; | |
5d506f15 NP |
268 | nr_lpids = 1UL << mmu_lpid_bits; |
269 | } else { | |
03a2e65f | 270 | nr_lpids = 1UL << KVM_MAX_NESTED_GUESTS_SHIFT; |
18827eee | 271 | } |
e55f4d58 | 272 | |
5d506f15 NP |
273 | if (!cpu_has_feature(CPU_FTR_ARCH_300)) { |
274 | /* POWER7 has 10-bit LPIDs, POWER8 has 12-bit LPIDs */ | |
275 | if (cpu_has_feature(CPU_FTR_ARCH_207S)) | |
276 | WARN_ON(nr_lpids != 1UL << 12); | |
277 | else | |
278 | WARN_ON(nr_lpids != 1UL << 10); | |
9e368f29 | 279 | |
5d506f15 NP |
280 | /* |
281 | * Reserve the last implemented LPID use in partition | |
282 | * switching for POWER7 and POWER8. | |
283 | */ | |
284 | nr_lpids -= 1; | |
285 | } | |
043cc4d7 | 286 | |
5d506f15 | 287 | kvmppc_init_lpid(nr_lpids); |
de56a948 PM |
288 | |
289 | return 0; | |
290 | } | |
291 | ||
025c9511 | 292 | static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, |
7ed661bf PM |
293 | long pte_index, unsigned long pteh, |
294 | unsigned long ptel, unsigned long *pte_idx_ret) | |
c77162de | 295 | { |
c77162de PM |
296 | long ret; |
297 | ||
e3d8ed55 | 298 | preempt_disable(); |
7ed661bf | 299 | ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, |
8a9c8925 | 300 | kvm->mm->pgd, false, pte_idx_ret); |
e3d8ed55 | 301 | preempt_enable(); |
c77162de PM |
302 | if (ret == H_TOO_HARD) { |
303 | /* this can't happen */ | |
304 | pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); | |
305 | ret = H_RESOURCE; /* or something */ | |
306 | } | |
307 | return ret; | |
308 | ||
309 | } | |
310 | ||
697d3899 PM |
311 | static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, |
312 | gva_t eaddr) | |
313 | { | |
314 | u64 mask; | |
315 | int i; | |
316 | ||
317 | for (i = 0; i < vcpu->arch.slb_nr; i++) { | |
318 | if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) | |
319 | continue; | |
320 | ||
321 | if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) | |
322 | mask = ESID_MASK_1T; | |
323 | else | |
324 | mask = ESID_MASK; | |
325 | ||
326 | if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) | |
327 | return &vcpu->arch.slb[i]; | |
328 | } | |
329 | return NULL; | |
330 | } | |
331 | ||
332 | static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, | |
333 | unsigned long ea) | |
334 | { | |
335 | unsigned long ra_mask; | |
336 | ||
8dc6cca5 | 337 | ra_mask = kvmppc_actual_pgsz(v, r) - 1; |
697d3899 PM |
338 | return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); |
339 | } | |
340 | ||
de56a948 | 341 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
93b159b4 | 342 | struct kvmppc_pte *gpte, bool data, bool iswrite) |
de56a948 | 343 | { |
697d3899 PM |
344 | struct kvm *kvm = vcpu->kvm; |
345 | struct kvmppc_slb *slbe; | |
346 | unsigned long slb_v; | |
347 | unsigned long pp, key; | |
abb7c7dd | 348 | unsigned long v, orig_v, gr; |
6f22bd32 | 349 | __be64 *hptep; |
46dec40f | 350 | long int index; |
6de2e837 | 351 | int virtmode = __kvmppc_get_msr_hv(vcpu) & (data ? MSR_DR : MSR_IR); |
697d3899 | 352 | |
18c3640c PM |
353 | if (kvm_is_radix(vcpu->kvm)) |
354 | return kvmppc_mmu_radix_xlate(vcpu, eaddr, gpte, data, iswrite); | |
355 | ||
697d3899 PM |
356 | /* Get SLB entry */ |
357 | if (virtmode) { | |
358 | slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); | |
359 | if (!slbe) | |
360 | return -EINVAL; | |
361 | slb_v = slbe->origv; | |
362 | } else { | |
363 | /* real mode access */ | |
364 | slb_v = vcpu->kvm->arch.vrma_slb_v; | |
365 | } | |
366 | ||
91648ec0 | 367 | preempt_disable(); |
697d3899 PM |
368 | /* Find the HPTE in the hash table */ |
369 | index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, | |
370 | HPTE_V_VALID | HPTE_V_ABSENT); | |
91648ec0 | 371 | if (index < 0) { |
372 | preempt_enable(); | |
697d3899 | 373 | return -ENOENT; |
91648ec0 | 374 | } |
3f9d4f5a | 375 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
abb7c7dd PM |
376 | v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
377 | if (cpu_has_feature(CPU_FTR_ARCH_300)) | |
378 | v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1])); | |
3f9d4f5a | 379 | gr = kvm->arch.hpt.rev[index].guest_rpte; |
697d3899 | 380 | |
abb7c7dd | 381 | unlock_hpte(hptep, orig_v); |
91648ec0 | 382 | preempt_enable(); |
697d3899 PM |
383 | |
384 | gpte->eaddr = eaddr; | |
385 | gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); | |
386 | ||
387 | /* Get PP bits and key for permission check */ | |
388 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
6de2e837 | 389 | key = (__kvmppc_get_msr_hv(vcpu) & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; |
697d3899 PM |
390 | key &= slb_v; |
391 | ||
392 | /* Calculate permissions */ | |
393 | gpte->may_read = hpte_read_permission(pp, key); | |
394 | gpte->may_write = hpte_write_permission(pp, key); | |
395 | gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); | |
396 | ||
397 | /* Storage key permission check for POWER7 */ | |
c17b98cf | 398 | if (data && virtmode) { |
697d3899 PM |
399 | int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); |
400 | if (amrfield & 1) | |
401 | gpte->may_read = 0; | |
402 | if (amrfield & 2) | |
403 | gpte->may_write = 0; | |
404 | } | |
405 | ||
406 | /* Get the guest physical address */ | |
407 | gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Quick test for whether an instruction is a load or a store. | |
413 | * If the instruction is a load or a store, then this will indicate | |
414 | * which it is, at least on server processors. (Embedded processors | |
415 | * have some external PID instructions that don't follow the rule | |
416 | * embodied here.) If the instruction isn't a load or store, then | |
417 | * this doesn't return anything useful. | |
418 | */ | |
acf17878 | 419 | static int instruction_is_store(ppc_inst_t instr) |
697d3899 PM |
420 | { |
421 | unsigned int mask; | |
acf17878 | 422 | unsigned int suffix; |
697d3899 PM |
423 | |
424 | mask = 0x10000000; | |
acf17878 PM |
425 | suffix = ppc_inst_val(instr); |
426 | if (ppc_inst_prefixed(instr)) | |
427 | suffix = ppc_inst_suffix(instr); | |
428 | else if ((suffix & 0xfc000000) == 0x7c000000) | |
697d3899 | 429 | mask = 0x100; /* major opcode 31 */ |
acf17878 | 430 | return (suffix & mask) != 0; |
697d3899 PM |
431 | } |
432 | ||
8c99d345 | 433 | int kvmppc_hv_emulate_mmio(struct kvm_vcpu *vcpu, |
5a319350 | 434 | unsigned long gpa, gva_t ea, int is_store) |
697d3899 | 435 | { |
acf17878 | 436 | ppc_inst_t last_inst; |
953e3739 | 437 | bool is_prefixed = !!(kvmppc_get_msr(vcpu) & SRR1_PREFIXED); |
697d3899 | 438 | |
1b642257 SJS |
439 | /* |
440 | * Fast path - check if the guest physical address corresponds to a | |
441 | * device on the FAST_MMIO_BUS, if so we can avoid loading the | |
442 | * instruction all together, then we can just handle it and return. | |
443 | */ | |
444 | if (is_store) { | |
445 | int idx, ret; | |
446 | ||
447 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
448 | ret = kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, (gpa_t) gpa, 0, | |
449 | NULL); | |
450 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
451 | if (!ret) { | |
953e3739 | 452 | kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + (is_prefixed ? 8 : 4)); |
1b642257 SJS |
453 | return RESUME_GUEST; |
454 | } | |
455 | } | |
456 | ||
51f04726 | 457 | /* |
697d3899 PM |
458 | * If we fail, we just return to the guest and try executing it again. |
459 | */ | |
51f04726 MC |
460 | if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != |
461 | EMULATE_DONE) | |
462 | return RESUME_GUEST; | |
697d3899 PM |
463 | |
464 | /* | |
465 | * WARNING: We do not know for sure whether the instruction we just | |
466 | * read from memory is the same that caused the fault in the first | |
953e3739 PM |
467 | * place. |
468 | * | |
469 | * If the fault is prefixed but the instruction is not or vice | |
470 | * versa, try again so that we don't advance pc the wrong amount. | |
471 | */ | |
472 | if (ppc_inst_prefixed(last_inst) != is_prefixed) | |
473 | return RESUME_GUEST; | |
474 | ||
475 | /* | |
476 | * If the instruction we read is neither an load or a store, | |
697d3899 PM |
477 | * then it can't access memory, so we don't need to worry about |
478 | * enforcing access permissions. So, assuming it is a load or | |
479 | * store, we just check that its direction (load or store) is | |
480 | * consistent with the original fault, since that's what we | |
481 | * checked the access permissions against. If there is a mismatch | |
482 | * we just return and retry the instruction. | |
483 | */ | |
484 | ||
51f04726 | 485 | if (instruction_is_store(last_inst) != !!is_store) |
697d3899 PM |
486 | return RESUME_GUEST; |
487 | ||
488 | /* | |
489 | * Emulated accesses are emulated by looking at the hash for | |
490 | * translation once, then performing the access later. The | |
491 | * translation could be invalidated in the meantime in which | |
492 | * point performing the subsequent memory access on the old | |
493 | * physical address could possibly be a security hole for the | |
494 | * guest (but not the host). | |
495 | * | |
496 | * This is less of an issue for MMIO stores since they aren't | |
497 | * globally visible. It could be an issue for MMIO loads to | |
498 | * a certain extent but we'll ignore it for now. | |
499 | */ | |
500 | ||
501 | vcpu->arch.paddr_accessed = gpa; | |
6020c0f6 | 502 | vcpu->arch.vaddr_accessed = ea; |
8c99d345 | 503 | return kvmppc_emulate_mmio(vcpu); |
697d3899 PM |
504 | } |
505 | ||
8c99d345 | 506 | int kvmppc_book3s_hv_page_fault(struct kvm_vcpu *vcpu, |
697d3899 PM |
507 | unsigned long ea, unsigned long dsisr) |
508 | { | |
509 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 | 510 | unsigned long hpte[3], r; |
abb7c7dd | 511 | unsigned long hnow_v, hnow_r; |
6f22bd32 | 512 | __be64 *hptep; |
342d3db7 | 513 | unsigned long mmu_seq, psize, pte_size; |
1066f772 | 514 | unsigned long gpa_base, gfn_base; |
cd758a9b | 515 | unsigned long gpa, gfn, hva, pfn, hpa; |
697d3899 | 516 | struct kvm_memory_slot *memslot; |
342d3db7 | 517 | unsigned long *rmap; |
697d3899 | 518 | struct revmap_entry *rev; |
cd758a9b PM |
519 | struct page *page; |
520 | long index, ret; | |
30bda41a | 521 | bool is_ci; |
cd758a9b PM |
522 | bool writing, write_ok; |
523 | unsigned int shift; | |
bad3b507 | 524 | unsigned long rcbits; |
a56ee9f8 | 525 | long mmio_update; |
cd758a9b | 526 | pte_t pte, *ptep; |
697d3899 | 527 | |
5a319350 | 528 | if (kvm_is_radix(kvm)) |
8c99d345 | 529 | return kvmppc_book3s_radix_page_fault(vcpu, ea, dsisr); |
5a319350 | 530 | |
697d3899 PM |
531 | /* |
532 | * Real-mode code has already searched the HPT and found the | |
533 | * entry we're interested in. Lock the entry and check that | |
534 | * it hasn't changed. If it has, just return and re-execute the | |
535 | * instruction. | |
536 | */ | |
537 | if (ea != vcpu->arch.pgfault_addr) | |
538 | return RESUME_GUEST; | |
a56ee9f8 YX |
539 | |
540 | if (vcpu->arch.pgfault_cache) { | |
541 | mmio_update = atomic64_read(&kvm->arch.mmio_update); | |
542 | if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) { | |
543 | r = vcpu->arch.pgfault_cache->rpte; | |
8dc6cca5 PM |
544 | psize = kvmppc_actual_pgsz(vcpu->arch.pgfault_hpte[0], |
545 | r); | |
a56ee9f8 YX |
546 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); |
547 | gfn_base = gpa_base >> PAGE_SHIFT; | |
548 | gpa = gpa_base | (ea & (psize - 1)); | |
8c99d345 | 549 | return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, |
a56ee9f8 YX |
550 | dsisr & DSISR_ISSTORE); |
551 | } | |
552 | } | |
697d3899 | 553 | index = vcpu->arch.pgfault_index; |
3f9d4f5a DG |
554 | hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4)); |
555 | rev = &kvm->arch.hpt.rev[index]; | |
697d3899 PM |
556 | preempt_disable(); |
557 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
558 | cpu_relax(); | |
6f22bd32 AG |
559 | hpte[0] = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK; |
560 | hpte[1] = be64_to_cpu(hptep[1]); | |
342d3db7 | 561 | hpte[2] = r = rev->guest_rpte; |
a4bd6eb0 | 562 | unlock_hpte(hptep, hpte[0]); |
697d3899 PM |
563 | preempt_enable(); |
564 | ||
abb7c7dd PM |
565 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
566 | hpte[0] = hpte_new_to_old_v(hpte[0], hpte[1]); | |
567 | hpte[1] = hpte_new_to_old_r(hpte[1]); | |
568 | } | |
697d3899 PM |
569 | if (hpte[0] != vcpu->arch.pgfault_hpte[0] || |
570 | hpte[1] != vcpu->arch.pgfault_hpte[1]) | |
571 | return RESUME_GUEST; | |
572 | ||
573 | /* Translate the logical address and get the page */ | |
8dc6cca5 | 574 | psize = kvmppc_actual_pgsz(hpte[0], r); |
1066f772 PM |
575 | gpa_base = r & HPTE_R_RPN & ~(psize - 1); |
576 | gfn_base = gpa_base >> PAGE_SHIFT; | |
577 | gpa = gpa_base | (ea & (psize - 1)); | |
70bddfef | 578 | gfn = gpa >> PAGE_SHIFT; |
697d3899 PM |
579 | memslot = gfn_to_memslot(kvm, gfn); |
580 | ||
3c78f78a SW |
581 | trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr); |
582 | ||
697d3899 | 583 | /* No memslot means it's an emulated MMIO region */ |
70bddfef | 584 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
8c99d345 | 585 | return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, |
697d3899 | 586 | dsisr & DSISR_ISSTORE); |
697d3899 | 587 | |
1066f772 PM |
588 | /* |
589 | * This should never happen, because of the slot_is_aligned() | |
590 | * check in kvmppc_do_h_enter(). | |
591 | */ | |
592 | if (gfn_base < memslot->base_gfn) | |
593 | return -EFAULT; | |
594 | ||
342d3db7 | 595 | /* used to check for invalidations in progress */ |
20ec3ebd | 596 | mmu_seq = kvm->mmu_invalidate_seq; |
342d3db7 PM |
597 | smp_rmb(); |
598 | ||
3c78f78a | 599 | ret = -EFAULT; |
342d3db7 | 600 | page = NULL; |
4cf302bc PM |
601 | writing = (dsisr & DSISR_ISSTORE) != 0; |
602 | /* If writing != 0, then the HPTE must allow writing, if we get here */ | |
603 | write_ok = writing; | |
342d3db7 | 604 | hva = gfn_to_hva_memslot(memslot, gfn); |
cd758a9b PM |
605 | |
606 | /* | |
607 | * Do a fast check first, since __gfn_to_pfn_memslot doesn't | |
608 | * do it with !atomic && !async, which is how we call it. | |
609 | * We always ask for write permission since the common case | |
610 | * is that the page is writable. | |
611 | */ | |
dadbb612 | 612 | if (get_user_page_fast_only(hva, FOLL_WRITE, &page)) { |
cd758a9b | 613 | write_ok = true; |
342d3db7 | 614 | } else { |
cd758a9b | 615 | /* Call KVM generic code to do the slow-path check */ |
c8b88b33 | 616 | pfn = __gfn_to_pfn_memslot(memslot, gfn, false, false, NULL, |
4a42d848 | 617 | writing, &write_ok, NULL); |
cd758a9b PM |
618 | if (is_error_noslot_pfn(pfn)) |
619 | return -EFAULT; | |
620 | page = NULL; | |
621 | if (pfn_valid(pfn)) { | |
622 | page = pfn_to_page(pfn); | |
623 | if (PageReserved(page)) | |
624 | page = NULL; | |
4cf302bc | 625 | } |
342d3db7 PM |
626 | } |
627 | ||
cd758a9b PM |
628 | /* |
629 | * Read the PTE from the process' radix tree and use that | |
630 | * so we get the shift and attribute bits. | |
631 | */ | |
9781e759 AK |
632 | spin_lock(&kvm->mmu_lock); |
633 | ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &shift); | |
ae49deda PM |
634 | pte = __pte(0); |
635 | if (ptep) | |
9781e759 AK |
636 | pte = READ_ONCE(*ptep); |
637 | spin_unlock(&kvm->mmu_lock); | |
cd758a9b PM |
638 | /* |
639 | * If the PTE disappeared temporarily due to a THP | |
640 | * collapse, just return and let the guest try again. | |
641 | */ | |
ae49deda | 642 | if (!pte_present(pte)) { |
cd758a9b PM |
643 | if (page) |
644 | put_page(page); | |
645 | return RESUME_GUEST; | |
646 | } | |
cd758a9b PM |
647 | hpa = pte_pfn(pte) << PAGE_SHIFT; |
648 | pte_size = PAGE_SIZE; | |
649 | if (shift) | |
650 | pte_size = 1ul << shift; | |
651 | is_ci = pte_ci(pte); | |
652 | ||
342d3db7 PM |
653 | if (psize > pte_size) |
654 | goto out_put; | |
cd758a9b PM |
655 | if (pte_size > psize) |
656 | hpa |= hva & (pte_size - psize); | |
342d3db7 PM |
657 | |
658 | /* Check WIMG vs. the actual page we're accessing */ | |
30bda41a AK |
659 | if (!hpte_cache_flags_ok(r, is_ci)) { |
660 | if (is_ci) | |
3c78f78a | 661 | goto out_put; |
342d3db7 PM |
662 | /* |
663 | * Allow guest to map emulated device memory as | |
664 | * uncacheable, but actually make it cacheable. | |
665 | */ | |
666 | r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; | |
667 | } | |
668 | ||
caaa4c80 | 669 | /* |
cd758a9b PM |
670 | * Set the HPTE to point to hpa. |
671 | * Since the hpa is at PAGE_SIZE granularity, make sure we | |
caaa4c80 PM |
672 | * don't mask out lower-order bits if psize < PAGE_SIZE. |
673 | */ | |
674 | if (psize < PAGE_SIZE) | |
675 | psize = PAGE_SIZE; | |
cd758a9b | 676 | r = (r & HPTE_R_KEY_HI) | (r & ~(HPTE_R_PP0 - psize)) | hpa; |
4cf302bc PM |
677 | if (hpte_is_writable(r) && !write_ok) |
678 | r = hpte_make_readonly(r); | |
342d3db7 PM |
679 | ret = RESUME_GUEST; |
680 | preempt_disable(); | |
681 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
682 | cpu_relax(); | |
abb7c7dd PM |
683 | hnow_v = be64_to_cpu(hptep[0]); |
684 | hnow_r = be64_to_cpu(hptep[1]); | |
685 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
686 | hnow_v = hpte_new_to_old_v(hnow_v, hnow_r); | |
687 | hnow_r = hpte_new_to_old_r(hnow_r); | |
688 | } | |
38c53af8 PM |
689 | |
690 | /* | |
691 | * If the HPT is being resized, don't update the HPTE, | |
692 | * instead let the guest retry after the resize operation is complete. | |
072df813 | 693 | * The synchronization for mmu_ready test vs. set is provided |
38c53af8 PM |
694 | * by the HPTE lock. |
695 | */ | |
072df813 | 696 | if (!kvm->arch.mmu_ready) |
38c53af8 PM |
697 | goto out_unlock; |
698 | ||
abb7c7dd PM |
699 | if ((hnow_v & ~HPTE_V_HVLOCK) != hpte[0] || hnow_r != hpte[1] || |
700 | rev->guest_rpte != hpte[2]) | |
342d3db7 PM |
701 | /* HPTE has been changed under us; let the guest retry */ |
702 | goto out_unlock; | |
703 | hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; | |
704 | ||
1066f772 PM |
705 | /* Always put the HPTE in the rmap chain for the page base address */ |
706 | rmap = &memslot->arch.rmap[gfn_base - memslot->base_gfn]; | |
342d3db7 PM |
707 | lock_rmap(rmap); |
708 | ||
709 | /* Check if we might have been invalidated; let the guest retry if so */ | |
710 | ret = RESUME_GUEST; | |
20ec3ebd | 711 | if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) { |
342d3db7 PM |
712 | unlock_rmap(rmap); |
713 | goto out_unlock; | |
714 | } | |
4cf302bc | 715 | |
bad3b507 PM |
716 | /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ |
717 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
718 | r &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
719 | ||
6f22bd32 | 720 | if (be64_to_cpu(hptep[0]) & HPTE_V_VALID) { |
4cf302bc PM |
721 | /* HPTE was previously valid, so we need to invalidate it */ |
722 | unlock_rmap(rmap); | |
6f22bd32 | 723 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
4cf302bc | 724 | kvmppc_invalidate_hpte(kvm, hptep, index); |
bad3b507 | 725 | /* don't lose previous R and C bits */ |
6f22bd32 | 726 | r |= be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); |
4cf302bc PM |
727 | } else { |
728 | kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); | |
729 | } | |
342d3db7 | 730 | |
abb7c7dd PM |
731 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
732 | r = hpte_old_to_new_r(hpte[0], r); | |
733 | hpte[0] = hpte_old_to_new_v(hpte[0]); | |
734 | } | |
6f22bd32 | 735 | hptep[1] = cpu_to_be64(r); |
342d3db7 | 736 | eieio(); |
a4bd6eb0 | 737 | __unlock_hpte(hptep, hpte[0]); |
342d3db7 PM |
738 | asm volatile("ptesync" : : : "memory"); |
739 | preempt_enable(); | |
4cf302bc | 740 | if (page && hpte_is_writable(r)) |
cd758a9b | 741 | set_page_dirty_lock(page); |
342d3db7 PM |
742 | |
743 | out_put: | |
3c78f78a SW |
744 | trace_kvm_page_fault_exit(vcpu, hpte, ret); |
745 | ||
cd758a9b PM |
746 | if (page) |
747 | put_page(page); | |
342d3db7 PM |
748 | return ret; |
749 | ||
750 | out_unlock: | |
a4bd6eb0 | 751 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 PM |
752 | preempt_enable(); |
753 | goto out_put; | |
754 | } | |
755 | ||
18c3640c | 756 | void kvmppc_rmap_reset(struct kvm *kvm) |
a64fd707 PM |
757 | { |
758 | struct kvm_memslots *slots; | |
759 | struct kvm_memory_slot *memslot; | |
a54d8066 | 760 | int srcu_idx, bkt; |
a64fd707 PM |
761 | |
762 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
9f6b8029 | 763 | slots = kvm_memslots(kvm); |
a54d8066 | 764 | kvm_for_each_memslot(memslot, bkt, slots) { |
234ff0b7 PM |
765 | /* Mutual exclusion with kvm_unmap_hva_range etc. */ |
766 | spin_lock(&kvm->mmu_lock); | |
a64fd707 PM |
767 | /* |
768 | * This assumes it is acceptable to lose reference and | |
769 | * change bits across a reset. | |
770 | */ | |
771 | memset(memslot->arch.rmap, 0, | |
772 | memslot->npages * sizeof(*memslot->arch.rmap)); | |
234ff0b7 | 773 | spin_unlock(&kvm->mmu_lock); |
a64fd707 PM |
774 | } |
775 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
776 | } | |
777 | ||
639e4597 DG |
778 | /* Must be called with both HPTE and rmap locked */ |
779 | static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i, | |
e641a317 | 780 | struct kvm_memory_slot *memslot, |
639e4597 DG |
781 | unsigned long *rmapp, unsigned long gfn) |
782 | { | |
783 | __be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); | |
784 | struct revmap_entry *rev = kvm->arch.hpt.rev; | |
785 | unsigned long j, h; | |
786 | unsigned long ptel, psize, rcbits; | |
787 | ||
788 | j = rev[i].forw; | |
789 | if (j == i) { | |
790 | /* chain is now empty */ | |
791 | *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); | |
792 | } else { | |
793 | /* remove i from chain */ | |
794 | h = rev[i].back; | |
795 | rev[h].forw = j; | |
796 | rev[j].back = h; | |
797 | rev[i].forw = rev[i].back = i; | |
798 | *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; | |
799 | } | |
800 | ||
801 | /* Now check and modify the HPTE */ | |
802 | ptel = rev[i].guest_rpte; | |
8dc6cca5 | 803 | psize = kvmppc_actual_pgsz(be64_to_cpu(hptep[0]), ptel); |
639e4597 DG |
804 | if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) && |
805 | hpte_rpn(ptel, psize) == gfn) { | |
806 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); | |
807 | kvmppc_invalidate_hpte(kvm, hptep, i); | |
808 | hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO); | |
809 | /* Harvest R and C */ | |
810 | rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C); | |
811 | *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; | |
e641a317 PM |
812 | if ((rcbits & HPTE_R_C) && memslot->dirty_bitmap) |
813 | kvmppc_update_dirty_map(memslot, gfn, psize); | |
639e4597 DG |
814 | if (rcbits & ~rev[i].guest_rpte) { |
815 | rev[i].guest_rpte = ptel | rcbits; | |
816 | note_hpte_modification(kvm, &rev[i]); | |
817 | } | |
818 | } | |
819 | } | |
820 | ||
32b48bf8 | 821 | static void kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
b1c5356e | 822 | unsigned long gfn) |
342d3db7 | 823 | { |
639e4597 | 824 | unsigned long i; |
6f22bd32 | 825 | __be64 *hptep; |
01756099 | 826 | unsigned long *rmapp; |
342d3db7 | 827 | |
01756099 | 828 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
342d3db7 | 829 | for (;;) { |
bad3b507 | 830 | lock_rmap(rmapp); |
342d3db7 | 831 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
bad3b507 | 832 | unlock_rmap(rmapp); |
342d3db7 PM |
833 | break; |
834 | } | |
835 | ||
836 | /* | |
837 | * To avoid an ABBA deadlock with the HPTE lock bit, | |
bad3b507 PM |
838 | * we can't spin on the HPTE lock while holding the |
839 | * rmap chain lock. | |
342d3db7 PM |
840 | */ |
841 | i = *rmapp & KVMPPC_RMAP_INDEX; | |
3f9d4f5a | 842 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
bad3b507 PM |
843 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { |
844 | /* unlock rmap before spinning on the HPTE lock */ | |
845 | unlock_rmap(rmapp); | |
6f22bd32 | 846 | while (be64_to_cpu(hptep[0]) & HPTE_V_HVLOCK) |
bad3b507 PM |
847 | cpu_relax(); |
848 | continue; | |
849 | } | |
342d3db7 | 850 | |
e641a317 | 851 | kvmppc_unmap_hpte(kvm, i, memslot, rmapp, gfn); |
bad3b507 | 852 | unlock_rmap(rmapp); |
a4bd6eb0 | 853 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
342d3db7 | 854 | } |
342d3db7 PM |
855 | } |
856 | ||
b1c5356e | 857 | bool kvm_unmap_gfn_range_hv(struct kvm *kvm, struct kvm_gfn_range *range) |
b3ae2096 | 858 | { |
32b48bf8 NP |
859 | gfn_t gfn; |
860 | ||
861 | if (kvm_is_radix(kvm)) { | |
862 | for (gfn = range->start; gfn < range->end; gfn++) | |
863 | kvm_unmap_radix(kvm, range->slot, gfn); | |
864 | } else { | |
865 | for (gfn = range->start; gfn < range->end; gfn++) | |
da3bb206 | 866 | kvm_unmap_rmapp(kvm, range->slot, gfn); |
32b48bf8 | 867 | } |
01756099 | 868 | |
32b48bf8 | 869 | return false; |
b3ae2096 TY |
870 | } |
871 | ||
3a167bea AK |
872 | void kvmppc_core_flush_memslot_hv(struct kvm *kvm, |
873 | struct kvm_memory_slot *memslot) | |
dfe49dbd | 874 | { |
dfe49dbd PM |
875 | unsigned long gfn; |
876 | unsigned long n; | |
01756099 | 877 | unsigned long *rmapp; |
dfe49dbd | 878 | |
dfe49dbd | 879 | gfn = memslot->base_gfn; |
01756099 | 880 | rmapp = memslot->arch.rmap; |
5af3e9d0 PM |
881 | if (kvm_is_radix(kvm)) { |
882 | kvmppc_radix_flush_memslot(kvm, memslot); | |
883 | return; | |
884 | } | |
885 | ||
01756099 | 886 | for (n = memslot->npages; n; --n, ++gfn) { |
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 | ||
b1c5356e SC |
899 | static bool kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
900 | unsigned long gfn) | |
342d3db7 | 901 | { |
3f9d4f5a | 902 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 | 903 | unsigned long head, i, j; |
6f22bd32 | 904 | __be64 *hptep; |
15eb1b6a | 905 | bool ret = false; |
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; | |
15eb1b6a | 913 | ret = true; |
55514893 PM |
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 | } | |
15eb1b6a | 945 | ret = true; |
55514893 | 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 | ||
b1c5356e | 954 | bool kvm_age_gfn_hv(struct kvm *kvm, struct kvm_gfn_range *range) |
342d3db7 | 955 | { |
32b48bf8 NP |
956 | gfn_t gfn; |
957 | bool ret = false; | |
01756099 | 958 | |
32b48bf8 NP |
959 | if (kvm_is_radix(kvm)) { |
960 | for (gfn = range->start; gfn < range->end; gfn++) | |
961 | ret |= kvm_age_radix(kvm, range->slot, gfn); | |
962 | } else { | |
963 | for (gfn = range->start; gfn < range->end; gfn++) | |
964 | ret |= kvm_age_rmapp(kvm, range->slot, gfn); | |
965 | } | |
966 | ||
967 | return ret; | |
342d3db7 PM |
968 | } |
969 | ||
b1c5356e SC |
970 | static bool kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot, |
971 | unsigned long gfn) | |
342d3db7 | 972 | { |
3f9d4f5a | 973 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
55514893 PM |
974 | unsigned long head, i, j; |
975 | unsigned long *hp; | |
b1c5356e | 976 | bool ret = true; |
01756099 | 977 | unsigned long *rmapp; |
55514893 | 978 | |
01756099 | 979 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
55514893 | 980 | if (*rmapp & KVMPPC_RMAP_REFERENCED) |
b1c5356e | 981 | return true; |
55514893 PM |
982 | |
983 | lock_rmap(rmapp); | |
984 | if (*rmapp & KVMPPC_RMAP_REFERENCED) | |
985 | goto out; | |
986 | ||
987 | if (*rmapp & KVMPPC_RMAP_PRESENT) { | |
988 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
989 | do { | |
3f9d4f5a | 990 | hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4)); |
55514893 | 991 | j = rev[i].forw; |
6f22bd32 | 992 | if (be64_to_cpu(hp[1]) & HPTE_R_R) |
55514893 PM |
993 | goto out; |
994 | } while ((i = j) != head); | |
995 | } | |
b1c5356e | 996 | ret = false; |
55514893 PM |
997 | |
998 | out: | |
999 | unlock_rmap(rmapp); | |
1000 | return ret; | |
342d3db7 PM |
1001 | } |
1002 | ||
b1c5356e | 1003 | bool kvm_test_age_gfn_hv(struct kvm *kvm, struct kvm_gfn_range *range) |
342d3db7 | 1004 | { |
32b48bf8 | 1005 | WARN_ON(range->start + 1 != range->end); |
01756099 | 1006 | |
32b48bf8 NP |
1007 | if (kvm_is_radix(kvm)) |
1008 | return kvm_test_age_radix(kvm, range->slot, range->start); | |
1009 | else | |
1010 | return kvm_test_age_rmapp(kvm, range->slot, range->start); | |
342d3db7 PM |
1011 | } |
1012 | ||
6c576e74 PM |
1013 | static int vcpus_running(struct kvm *kvm) |
1014 | { | |
1015 | return atomic_read(&kvm->arch.vcpus_running) != 0; | |
1016 | } | |
1017 | ||
687414be AK |
1018 | /* |
1019 | * Returns the number of system pages that are dirty. | |
1020 | * This can be more than 1 if we find a huge-page HPTE. | |
1021 | */ | |
1022 | static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp) | |
82ed3616 | 1023 | { |
3f9d4f5a | 1024 | struct revmap_entry *rev = kvm->arch.hpt.rev; |
82ed3616 | 1025 | unsigned long head, i, j; |
687414be | 1026 | unsigned long n; |
6c576e74 | 1027 | unsigned long v, r; |
6f22bd32 | 1028 | __be64 *hptep; |
687414be | 1029 | int npages_dirty = 0; |
82ed3616 PM |
1030 | |
1031 | retry: | |
1032 | lock_rmap(rmapp); | |
82ed3616 PM |
1033 | if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { |
1034 | unlock_rmap(rmapp); | |
687414be | 1035 | return npages_dirty; |
82ed3616 PM |
1036 | } |
1037 | ||
1038 | i = head = *rmapp & KVMPPC_RMAP_INDEX; | |
1039 | do { | |
6f22bd32 | 1040 | unsigned long hptep1; |
3f9d4f5a | 1041 | hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4)); |
82ed3616 PM |
1042 | j = rev[i].forw; |
1043 | ||
6c576e74 PM |
1044 | /* |
1045 | * Checking the C (changed) bit here is racy since there | |
1046 | * is no guarantee about when the hardware writes it back. | |
1047 | * If the HPTE is not writable then it is stable since the | |
1048 | * page can't be written to, and we would have done a tlbie | |
1049 | * (which forces the hardware to complete any writeback) | |
1050 | * when making the HPTE read-only. | |
1051 | * If vcpus are running then this call is racy anyway | |
1052 | * since the page could get dirtied subsequently, so we | |
1053 | * expect there to be a further call which would pick up | |
1054 | * any delayed C bit writeback. | |
1055 | * Otherwise we need to do the tlbie even if C==0 in | |
1056 | * order to pick up any delayed writeback of C. | |
1057 | */ | |
6f22bd32 AG |
1058 | hptep1 = be64_to_cpu(hptep[1]); |
1059 | if (!(hptep1 & HPTE_R_C) && | |
1060 | (!hpte_is_writable(hptep1) || vcpus_running(kvm))) | |
82ed3616 PM |
1061 | continue; |
1062 | ||
1063 | if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { | |
1064 | /* unlock rmap before spinning on the HPTE lock */ | |
1065 | unlock_rmap(rmapp); | |
6f22bd32 | 1066 | while (hptep[0] & cpu_to_be64(HPTE_V_HVLOCK)) |
82ed3616 PM |
1067 | cpu_relax(); |
1068 | goto retry; | |
1069 | } | |
1070 | ||
1071 | /* Now check and modify the HPTE */ | |
f6fb9e84 | 1072 | if (!(hptep[0] & cpu_to_be64(HPTE_V_VALID))) { |
a4bd6eb0 | 1073 | __unlock_hpte(hptep, be64_to_cpu(hptep[0])); |
6c576e74 | 1074 | continue; |
f6fb9e84 | 1075 | } |
6c576e74 PM |
1076 | |
1077 | /* need to make it temporarily absent so C is stable */ | |
6f22bd32 | 1078 | hptep[0] |= cpu_to_be64(HPTE_V_ABSENT); |
6c576e74 | 1079 | kvmppc_invalidate_hpte(kvm, hptep, i); |
6f22bd32 AG |
1080 | v = be64_to_cpu(hptep[0]); |
1081 | r = be64_to_cpu(hptep[1]); | |
6c576e74 | 1082 | if (r & HPTE_R_C) { |
6f22bd32 | 1083 | hptep[1] = cpu_to_be64(r & ~HPTE_R_C); |
a1b4a0f6 PM |
1084 | if (!(rev[i].guest_rpte & HPTE_R_C)) { |
1085 | rev[i].guest_rpte |= HPTE_R_C; | |
1086 | note_hpte_modification(kvm, &rev[i]); | |
1087 | } | |
8dc6cca5 | 1088 | n = kvmppc_actual_pgsz(v, r); |
687414be AK |
1089 | n = (n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1090 | if (n > npages_dirty) | |
1091 | npages_dirty = n; | |
6c576e74 | 1092 | eieio(); |
82ed3616 | 1093 | } |
a4bd6eb0 | 1094 | v &= ~HPTE_V_ABSENT; |
6c576e74 | 1095 | v |= HPTE_V_VALID; |
a4bd6eb0 | 1096 | __unlock_hpte(hptep, v); |
82ed3616 PM |
1097 | } while ((i = j) != head); |
1098 | ||
1099 | unlock_rmap(rmapp); | |
687414be | 1100 | return npages_dirty; |
82ed3616 PM |
1101 | } |
1102 | ||
8f7b79b8 | 1103 | void kvmppc_harvest_vpa_dirty(struct kvmppc_vpa *vpa, |
c35635ef PM |
1104 | struct kvm_memory_slot *memslot, |
1105 | unsigned long *map) | |
1106 | { | |
1107 | unsigned long gfn; | |
1108 | ||
1109 | if (!vpa->dirty || !vpa->pinned_addr) | |
1110 | return; | |
1111 | gfn = vpa->gpa >> PAGE_SHIFT; | |
1112 | if (gfn < memslot->base_gfn || | |
1113 | gfn >= memslot->base_gfn + memslot->npages) | |
1114 | return; | |
1115 | ||
1116 | vpa->dirty = false; | |
1117 | if (map) | |
1118 | __set_bit_le(gfn - memslot->base_gfn, map); | |
1119 | } | |
1120 | ||
8f7b79b8 PM |
1121 | long kvmppc_hv_get_dirty_log_hpt(struct kvm *kvm, |
1122 | struct kvm_memory_slot *memslot, unsigned long *map) | |
82ed3616 | 1123 | { |
e641a317 | 1124 | unsigned long i; |
dfe49dbd | 1125 | unsigned long *rmapp; |
82ed3616 PM |
1126 | |
1127 | preempt_disable(); | |
d89cc617 | 1128 | rmapp = memslot->arch.rmap; |
82ed3616 | 1129 | for (i = 0; i < memslot->npages; ++i) { |
687414be AK |
1130 | int npages = kvm_test_clear_dirty_npages(kvm, rmapp); |
1131 | /* | |
1132 | * Note that if npages > 0 then i must be a multiple of npages, | |
1133 | * since we always put huge-page HPTEs in the rmap chain | |
1134 | * corresponding to their page base address. | |
1135 | */ | |
e641a317 PM |
1136 | if (npages) |
1137 | set_dirty_bits(map, i, npages); | |
82ed3616 PM |
1138 | ++rmapp; |
1139 | } | |
1140 | preempt_enable(); | |
1141 | return 0; | |
1142 | } | |
1143 | ||
93e60249 PM |
1144 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
1145 | unsigned long *nb_ret) | |
1146 | { | |
1147 | struct kvm_memory_slot *memslot; | |
1148 | unsigned long gfn = gpa >> PAGE_SHIFT; | |
342d3db7 PM |
1149 | struct page *page, *pages[1]; |
1150 | int npages; | |
c35635ef | 1151 | unsigned long hva, offset; |
2c9097e4 | 1152 | int srcu_idx; |
93e60249 | 1153 | |
2c9097e4 | 1154 | srcu_idx = srcu_read_lock(&kvm->srcu); |
93e60249 PM |
1155 | memslot = gfn_to_memslot(kvm, gfn); |
1156 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) | |
2c9097e4 | 1157 | goto err; |
c17b98cf | 1158 | hva = gfn_to_hva_memslot(memslot, gfn); |
73b0140b | 1159 | npages = get_user_pages_fast(hva, 1, FOLL_WRITE, pages); |
c17b98cf PM |
1160 | if (npages < 1) |
1161 | goto err; | |
1162 | page = pages[0]; | |
2c9097e4 PM |
1163 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
1164 | ||
c35635ef | 1165 | offset = gpa & (PAGE_SIZE - 1); |
93e60249 | 1166 | if (nb_ret) |
c35635ef | 1167 | *nb_ret = PAGE_SIZE - offset; |
93e60249 | 1168 | return page_address(page) + offset; |
2c9097e4 PM |
1169 | |
1170 | err: | |
1171 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1172 | return NULL; | |
93e60249 PM |
1173 | } |
1174 | ||
c35635ef PM |
1175 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, |
1176 | bool dirty) | |
93e60249 PM |
1177 | { |
1178 | struct page *page = virt_to_page(va); | |
c35635ef PM |
1179 | struct kvm_memory_slot *memslot; |
1180 | unsigned long gfn; | |
c35635ef | 1181 | int srcu_idx; |
93e60249 | 1182 | |
93e60249 | 1183 | put_page(page); |
c35635ef | 1184 | |
c17b98cf | 1185 | if (!dirty) |
c35635ef PM |
1186 | return; |
1187 | ||
e641a317 | 1188 | /* We need to mark this page dirty in the memslot dirty_bitmap, if any */ |
c35635ef PM |
1189 | gfn = gpa >> PAGE_SHIFT; |
1190 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
1191 | memslot = gfn_to_memslot(kvm, gfn); | |
e641a317 PM |
1192 | if (memslot && memslot->dirty_bitmap) |
1193 | set_bit_le(gfn - memslot->base_gfn, memslot->dirty_bitmap); | |
c35635ef | 1194 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
93e60249 PM |
1195 | } |
1196 | ||
5e985969 DG |
1197 | /* |
1198 | * HPT resizing | |
1199 | */ | |
1200 | static int resize_hpt_allocate(struct kvm_resize_hpt *resize) | |
1201 | { | |
b5baa687 DG |
1202 | int rc; |
1203 | ||
1204 | rc = kvmppc_allocate_hpt(&resize->hpt, resize->order); | |
1205 | if (rc < 0) | |
1206 | return rc; | |
1207 | ||
61119786 | 1208 | resize_hpt_debug(resize, "%s(): HPT @ 0x%lx\n", __func__, |
b5baa687 DG |
1209 | resize->hpt.virt); |
1210 | ||
5e985969 DG |
1211 | return 0; |
1212 | } | |
1213 | ||
b5baa687 DG |
1214 | static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize, |
1215 | unsigned long idx) | |
1216 | { | |
1217 | struct kvm *kvm = resize->kvm; | |
1218 | struct kvm_hpt_info *old = &kvm->arch.hpt; | |
1219 | struct kvm_hpt_info *new = &resize->hpt; | |
1220 | unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1; | |
1221 | unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1; | |
1222 | __be64 *hptep, *new_hptep; | |
1223 | unsigned long vpte, rpte, guest_rpte; | |
1224 | int ret; | |
1225 | struct revmap_entry *rev; | |
ded13fc1 | 1226 | unsigned long apsize, avpn, pteg, hash; |
b5baa687 | 1227 | unsigned long new_idx, new_pteg, replace_vpte; |
ded13fc1 | 1228 | int pshift; |
b5baa687 DG |
1229 | |
1230 | hptep = (__be64 *)(old->virt + (idx << 4)); | |
1231 | ||
1232 | /* Guest is stopped, so new HPTEs can't be added or faulted | |
1233 | * in, only unmapped or altered by host actions. So, it's | |
1234 | * safe to check this before we take the HPTE lock */ | |
1235 | vpte = be64_to_cpu(hptep[0]); | |
1236 | if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) | |
1237 | return 0; /* nothing to do */ | |
1238 | ||
1239 | while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) | |
1240 | cpu_relax(); | |
1241 | ||
1242 | vpte = be64_to_cpu(hptep[0]); | |
1243 | ||
1244 | ret = 0; | |
1245 | if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT)) | |
1246 | /* Nothing to do */ | |
1247 | goto out; | |
1248 | ||
790a9df5 DG |
1249 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1250 | rpte = be64_to_cpu(hptep[1]); | |
1251 | vpte = hpte_new_to_old_v(vpte, rpte); | |
1252 | } | |
1253 | ||
b5baa687 DG |
1254 | /* Unmap */ |
1255 | rev = &old->rev[idx]; | |
1256 | guest_rpte = rev->guest_rpte; | |
1257 | ||
1258 | ret = -EIO; | |
8dc6cca5 | 1259 | apsize = kvmppc_actual_pgsz(vpte, guest_rpte); |
b5baa687 DG |
1260 | if (!apsize) |
1261 | goto out; | |
1262 | ||
1263 | if (vpte & HPTE_V_VALID) { | |
1264 | unsigned long gfn = hpte_rpn(guest_rpte, apsize); | |
1265 | int srcu_idx = srcu_read_lock(&kvm->srcu); | |
1266 | struct kvm_memory_slot *memslot = | |
1267 | __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1268 | ||
1269 | if (memslot) { | |
1270 | unsigned long *rmapp; | |
1271 | rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; | |
1272 | ||
1273 | lock_rmap(rmapp); | |
e641a317 | 1274 | kvmppc_unmap_hpte(kvm, idx, memslot, rmapp, gfn); |
b5baa687 DG |
1275 | unlock_rmap(rmapp); |
1276 | } | |
1277 | ||
1278 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
1279 | } | |
1280 | ||
1281 | /* Reload PTE after unmap */ | |
1282 | vpte = be64_to_cpu(hptep[0]); | |
b5baa687 DG |
1283 | BUG_ON(vpte & HPTE_V_VALID); |
1284 | BUG_ON(!(vpte & HPTE_V_ABSENT)); | |
1285 | ||
1286 | ret = 0; | |
1287 | if (!(vpte & HPTE_V_BOLTED)) | |
1288 | goto out; | |
1289 | ||
1290 | rpte = be64_to_cpu(hptep[1]); | |
790a9df5 DG |
1291 | |
1292 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
1293 | vpte = hpte_new_to_old_v(vpte, rpte); | |
1294 | rpte = hpte_new_to_old_r(rpte); | |
1295 | } | |
1296 | ||
ded13fc1 PM |
1297 | pshift = kvmppc_hpte_base_page_shift(vpte, rpte); |
1298 | avpn = HPTE_V_AVPN_VAL(vpte) & ~(((1ul << pshift) - 1) >> 23); | |
b5baa687 DG |
1299 | pteg = idx / HPTES_PER_GROUP; |
1300 | if (vpte & HPTE_V_SECONDARY) | |
1301 | pteg = ~pteg; | |
1302 | ||
1303 | if (!(vpte & HPTE_V_1TB_SEG)) { | |
1304 | unsigned long offset, vsid; | |
1305 | ||
1306 | /* We only have 28 - 23 bits of offset in avpn */ | |
1307 | offset = (avpn & 0x1f) << 23; | |
1308 | vsid = avpn >> 5; | |
1309 | /* We can find more bits from the pteg value */ | |
ded13fc1 PM |
1310 | if (pshift < 23) |
1311 | offset |= ((vsid ^ pteg) & old_hash_mask) << pshift; | |
b5baa687 | 1312 | |
ded13fc1 | 1313 | hash = vsid ^ (offset >> pshift); |
b5baa687 DG |
1314 | } else { |
1315 | unsigned long offset, vsid; | |
1316 | ||
1317 | /* We only have 40 - 23 bits of seg_off in avpn */ | |
1318 | offset = (avpn & 0x1ffff) << 23; | |
1319 | vsid = avpn >> 17; | |
ded13fc1 PM |
1320 | if (pshift < 23) |
1321 | offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) << pshift; | |
b5baa687 | 1322 | |
ded13fc1 | 1323 | hash = vsid ^ (vsid << 25) ^ (offset >> pshift); |
b5baa687 DG |
1324 | } |
1325 | ||
1326 | new_pteg = hash & new_hash_mask; | |
05f2bb03 PM |
1327 | if (vpte & HPTE_V_SECONDARY) |
1328 | new_pteg = ~hash & new_hash_mask; | |
b5baa687 DG |
1329 | |
1330 | new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP); | |
1331 | new_hptep = (__be64 *)(new->virt + (new_idx << 4)); | |
1332 | ||
1333 | replace_vpte = be64_to_cpu(new_hptep[0]); | |
790a9df5 DG |
1334 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1335 | unsigned long replace_rpte = be64_to_cpu(new_hptep[1]); | |
1336 | replace_vpte = hpte_new_to_old_v(replace_vpte, replace_rpte); | |
1337 | } | |
b5baa687 DG |
1338 | |
1339 | if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
1340 | BUG_ON(new->order >= old->order); | |
1341 | ||
1342 | if (replace_vpte & HPTE_V_BOLTED) { | |
1343 | if (vpte & HPTE_V_BOLTED) | |
1344 | /* Bolted collision, nothing we can do */ | |
1345 | ret = -ENOSPC; | |
1346 | /* Discard the new HPTE */ | |
1347 | goto out; | |
1348 | } | |
1349 | ||
1350 | /* Discard the previous HPTE */ | |
1351 | } | |
1352 | ||
790a9df5 DG |
1353 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
1354 | rpte = hpte_old_to_new_r(vpte, rpte); | |
1355 | vpte = hpte_old_to_new_v(vpte); | |
1356 | } | |
1357 | ||
b5baa687 DG |
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 | ||
1375 | for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) { | |
1376 | rc = resize_hpt_rehash_hpte(resize, i); | |
1377 | if (rc != 0) | |
1378 | return rc; | |
1379 | } | |
1380 | ||
1381 | return 0; | |
5e985969 DG |
1382 | } |
1383 | ||
1384 | static void resize_hpt_pivot(struct kvm_resize_hpt *resize) | |
1385 | { | |
b5baa687 DG |
1386 | struct kvm *kvm = resize->kvm; |
1387 | struct kvm_hpt_info hpt_tmp; | |
1388 | ||
1389 | /* Exchange the pending tables in the resize structure with | |
1390 | * the active tables */ | |
1391 | ||
1392 | resize_hpt_debug(resize, "resize_hpt_pivot()\n"); | |
1393 | ||
1394 | spin_lock(&kvm->mmu_lock); | |
1395 | asm volatile("ptesync" : : : "memory"); | |
1396 | ||
1397 | hpt_tmp = kvm->arch.hpt; | |
1398 | kvmppc_set_hpt(kvm, &resize->hpt); | |
1399 | resize->hpt = hpt_tmp; | |
1400 | ||
1401 | spin_unlock(&kvm->mmu_lock); | |
1402 | ||
1403 | synchronize_srcu_expedited(&kvm->srcu); | |
1404 | ||
790a9df5 DG |
1405 | if (cpu_has_feature(CPU_FTR_ARCH_300)) |
1406 | kvmppc_setup_partition_table(kvm); | |
1407 | ||
b5baa687 | 1408 | resize_hpt_debug(resize, "resize_hpt_pivot() done\n"); |
5e985969 DG |
1409 | } |
1410 | ||
1411 | static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize) | |
1412 | { | |
0d4ee88d | 1413 | if (WARN_ON(!mutex_is_locked(&kvm->arch.mmu_setup_lock))) |
4ed11aee | 1414 | return; |
b5baa687 | 1415 | |
5b73d634 DG |
1416 | if (!resize) |
1417 | return; | |
1418 | ||
4ed11aee SP |
1419 | if (resize->error != -EBUSY) { |
1420 | if (resize->hpt.virt) | |
1421 | kvmppc_free_hpt(&resize->hpt); | |
1422 | kfree(resize); | |
1423 | } | |
b5baa687 | 1424 | |
4ed11aee SP |
1425 | if (kvm->arch.resize_hpt == resize) |
1426 | kvm->arch.resize_hpt = NULL; | |
5e985969 DG |
1427 | } |
1428 | ||
1429 | static void resize_hpt_prepare_work(struct work_struct *work) | |
1430 | { | |
1431 | struct kvm_resize_hpt *resize = container_of(work, | |
1432 | struct kvm_resize_hpt, | |
1433 | work); | |
1434 | struct kvm *kvm = resize->kvm; | |
4ed11aee | 1435 | int err = 0; |
5e985969 | 1436 | |
3073774e SP |
1437 | if (WARN_ON(resize->error != -EBUSY)) |
1438 | return; | |
1439 | ||
0d4ee88d | 1440 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 | 1441 | |
4ed11aee SP |
1442 | /* Request is still current? */ |
1443 | if (kvm->arch.resize_hpt == resize) { | |
1444 | /* We may request large allocations here: | |
0d4ee88d | 1445 | * do not sleep with kvm->arch.mmu_setup_lock held for a while. |
4ed11aee | 1446 | */ |
0d4ee88d | 1447 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 | 1448 | |
61119786 | 1449 | resize_hpt_debug(resize, "%s(): order = %d\n", __func__, |
4ed11aee | 1450 | resize->order); |
3073774e | 1451 | |
4ed11aee SP |
1452 | err = resize_hpt_allocate(resize); |
1453 | ||
1454 | /* We have strict assumption about -EBUSY | |
1455 | * when preparing for HPT resize. | |
1456 | */ | |
1457 | if (WARN_ON(err == -EBUSY)) | |
1458 | err = -EINPROGRESS; | |
1459 | ||
0d4ee88d | 1460 | mutex_lock(&kvm->arch.mmu_setup_lock); |
4ed11aee | 1461 | /* It is possible that kvm->arch.resize_hpt != resize |
0d4ee88d | 1462 | * after we grab kvm->arch.mmu_setup_lock again. |
4ed11aee SP |
1463 | */ |
1464 | } | |
5e985969 DG |
1465 | |
1466 | resize->error = err; | |
5e985969 | 1467 | |
4ed11aee SP |
1468 | if (kvm->arch.resize_hpt != resize) |
1469 | resize_hpt_release(kvm, resize); | |
1470 | ||
0d4ee88d | 1471 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1472 | } |
1473 | ||
67c48662 TH |
1474 | int kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm, |
1475 | struct kvm_ppc_resize_hpt *rhpt) | |
5e985969 DG |
1476 | { |
1477 | unsigned long flags = rhpt->flags; | |
1478 | unsigned long shift = rhpt->shift; | |
1479 | struct kvm_resize_hpt *resize; | |
1480 | int ret; | |
1481 | ||
891f1ebf | 1482 | if (flags != 0 || kvm_is_radix(kvm)) |
5e985969 DG |
1483 | return -EINVAL; |
1484 | ||
1485 | if (shift && ((shift < 18) || (shift > 46))) | |
1486 | return -EINVAL; | |
1487 | ||
0d4ee88d | 1488 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1489 | |
1490 | resize = kvm->arch.resize_hpt; | |
1491 | ||
1492 | if (resize) { | |
1493 | if (resize->order == shift) { | |
3073774e SP |
1494 | /* Suitable resize in progress? */ |
1495 | ret = resize->error; | |
1496 | if (ret == -EBUSY) | |
5e985969 | 1497 | ret = 100; /* estimated time in ms */ |
3073774e SP |
1498 | else if (ret) |
1499 | resize_hpt_release(kvm, resize); | |
5e985969 DG |
1500 | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | /* not suitable, cancel it */ | |
1505 | resize_hpt_release(kvm, resize); | |
1506 | } | |
1507 | ||
1508 | ret = 0; | |
1509 | if (!shift) | |
1510 | goto out; /* nothing to do */ | |
1511 | ||
1512 | /* start new resize */ | |
1513 | ||
1514 | resize = kzalloc(sizeof(*resize), GFP_KERNEL); | |
abd80dcb DC |
1515 | if (!resize) { |
1516 | ret = -ENOMEM; | |
1517 | goto out; | |
1518 | } | |
3073774e SP |
1519 | |
1520 | resize->error = -EBUSY; | |
5e985969 DG |
1521 | resize->order = shift; |
1522 | resize->kvm = kvm; | |
1523 | INIT_WORK(&resize->work, resize_hpt_prepare_work); | |
1524 | kvm->arch.resize_hpt = resize; | |
1525 | ||
1526 | schedule_work(&resize->work); | |
1527 | ||
1528 | ret = 100; /* estimated time in ms */ | |
1529 | ||
1530 | out: | |
0d4ee88d | 1531 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1532 | return ret; |
1533 | } | |
1534 | ||
1535 | static void resize_hpt_boot_vcpu(void *opaque) | |
1536 | { | |
1537 | /* Nothing to do, just force a KVM exit */ | |
1538 | } | |
1539 | ||
67c48662 TH |
1540 | int kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, |
1541 | struct kvm_ppc_resize_hpt *rhpt) | |
5e985969 DG |
1542 | { |
1543 | unsigned long flags = rhpt->flags; | |
1544 | unsigned long shift = rhpt->shift; | |
1545 | struct kvm_resize_hpt *resize; | |
67c48662 | 1546 | int ret; |
5e985969 | 1547 | |
891f1ebf | 1548 | if (flags != 0 || kvm_is_radix(kvm)) |
5e985969 DG |
1549 | return -EINVAL; |
1550 | ||
1551 | if (shift && ((shift < 18) || (shift > 46))) | |
1552 | return -EINVAL; | |
1553 | ||
0d4ee88d | 1554 | mutex_lock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1555 | |
1556 | resize = kvm->arch.resize_hpt; | |
1557 | ||
1558 | /* This shouldn't be possible */ | |
1559 | ret = -EIO; | |
1b151ce4 | 1560 | if (WARN_ON(!kvm->arch.mmu_ready)) |
5e985969 DG |
1561 | goto out_no_hpt; |
1562 | ||
1563 | /* Stop VCPUs from running while we mess with the HPT */ | |
1b151ce4 | 1564 | kvm->arch.mmu_ready = 0; |
5e985969 DG |
1565 | smp_mb(); |
1566 | ||
1567 | /* Boot all CPUs out of the guest so they re-read | |
1b151ce4 | 1568 | * mmu_ready */ |
5e985969 DG |
1569 | on_each_cpu(resize_hpt_boot_vcpu, NULL, 1); |
1570 | ||
1571 | ret = -ENXIO; | |
1572 | if (!resize || (resize->order != shift)) | |
1573 | goto out; | |
1574 | ||
5e985969 | 1575 | ret = resize->error; |
3073774e | 1576 | if (ret) |
5e985969 DG |
1577 | goto out; |
1578 | ||
1579 | ret = resize_hpt_rehash(resize); | |
3073774e | 1580 | if (ret) |
5e985969 DG |
1581 | goto out; |
1582 | ||
1583 | resize_hpt_pivot(resize); | |
1584 | ||
1585 | out: | |
1586 | /* Let VCPUs run again */ | |
1b151ce4 | 1587 | kvm->arch.mmu_ready = 1; |
5e985969 DG |
1588 | smp_mb(); |
1589 | out_no_hpt: | |
1590 | resize_hpt_release(kvm, resize); | |
0d4ee88d | 1591 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
5e985969 DG |
1592 | return ret; |
1593 | } | |
1594 | ||
a2932923 PM |
1595 | /* |
1596 | * Functions for reading and writing the hash table via reads and | |
1597 | * writes on a file descriptor. | |
1598 | * | |
1599 | * Reads return the guest view of the hash table, which has to be | |
1600 | * pieced together from the real hash table and the guest_rpte | |
1601 | * values in the revmap array. | |
1602 | * | |
1603 | * On writes, each HPTE written is considered in turn, and if it | |
1604 | * is valid, it is written to the HPT as if an H_ENTER with the | |
1605 | * exact flag set was done. When the invalid count is non-zero | |
1606 | * in the header written to the stream, the kernel will make | |
1607 | * sure that that many HPTEs are invalid, and invalidate them | |
1608 | * if not. | |
1609 | */ | |
1610 | ||
1611 | struct kvm_htab_ctx { | |
1612 | unsigned long index; | |
1613 | unsigned long flags; | |
1614 | struct kvm *kvm; | |
1615 | int first_pass; | |
1616 | }; | |
1617 | ||
1618 | #define HPTE_SIZE (2 * sizeof(unsigned long)) | |
1619 | ||
a1b4a0f6 PM |
1620 | /* |
1621 | * Returns 1 if this HPT entry has been modified or has pending | |
1622 | * R/C bit changes. | |
1623 | */ | |
6f22bd32 | 1624 | static int hpte_dirty(struct revmap_entry *revp, __be64 *hptp) |
a1b4a0f6 PM |
1625 | { |
1626 | unsigned long rcbits_unset; | |
1627 | ||
1628 | if (revp->guest_rpte & HPTE_GR_MODIFIED) | |
1629 | return 1; | |
1630 | ||
1631 | /* Also need to consider changes in reference and changed bits */ | |
1632 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
6f22bd32 AG |
1633 | if ((be64_to_cpu(hptp[0]) & HPTE_V_VALID) && |
1634 | (be64_to_cpu(hptp[1]) & rcbits_unset)) | |
a1b4a0f6 PM |
1635 | return 1; |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
6f22bd32 | 1640 | static long record_hpte(unsigned long flags, __be64 *hptp, |
a2932923 PM |
1641 | unsigned long *hpte, struct revmap_entry *revp, |
1642 | int want_valid, int first_pass) | |
1643 | { | |
abb7c7dd | 1644 | unsigned long v, r, hr; |
a1b4a0f6 | 1645 | unsigned long rcbits_unset; |
a2932923 PM |
1646 | int ok = 1; |
1647 | int valid, dirty; | |
1648 | ||
1649 | /* Unmodified entries are uninteresting except on the first pass */ | |
a1b4a0f6 | 1650 | dirty = hpte_dirty(revp, hptp); |
a2932923 PM |
1651 | if (!first_pass && !dirty) |
1652 | return 0; | |
1653 | ||
1654 | valid = 0; | |
6f22bd32 | 1655 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
a2932923 PM |
1656 | valid = 1; |
1657 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && | |
6f22bd32 | 1658 | !(be64_to_cpu(hptp[0]) & HPTE_V_BOLTED)) |
a2932923 PM |
1659 | valid = 0; |
1660 | } | |
1661 | if (valid != want_valid) | |
1662 | return 0; | |
1663 | ||
1664 | v = r = 0; | |
1665 | if (valid || dirty) { | |
1666 | /* lock the HPTE so it's stable and read it */ | |
1667 | preempt_disable(); | |
1668 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
1669 | cpu_relax(); | |
6f22bd32 | 1670 | v = be64_to_cpu(hptp[0]); |
abb7c7dd PM |
1671 | hr = be64_to_cpu(hptp[1]); |
1672 | if (cpu_has_feature(CPU_FTR_ARCH_300)) { | |
1673 | v = hpte_new_to_old_v(v, hr); | |
1674 | hr = hpte_new_to_old_r(hr); | |
1675 | } | |
a1b4a0f6 PM |
1676 | |
1677 | /* re-evaluate valid and dirty from synchronized HPTE value */ | |
1678 | valid = !!(v & HPTE_V_VALID); | |
1679 | dirty = !!(revp->guest_rpte & HPTE_GR_MODIFIED); | |
1680 | ||
1681 | /* Harvest R and C into guest view if necessary */ | |
1682 | rcbits_unset = ~revp->guest_rpte & (HPTE_R_R | HPTE_R_C); | |
abb7c7dd PM |
1683 | if (valid && (rcbits_unset & hr)) { |
1684 | revp->guest_rpte |= (hr & | |
6f22bd32 | 1685 | (HPTE_R_R | HPTE_R_C)) | HPTE_GR_MODIFIED; |
a1b4a0f6 PM |
1686 | dirty = 1; |
1687 | } | |
1688 | ||
a2932923 PM |
1689 | if (v & HPTE_V_ABSENT) { |
1690 | v &= ~HPTE_V_ABSENT; | |
1691 | v |= HPTE_V_VALID; | |
a1b4a0f6 | 1692 | valid = 1; |
a2932923 | 1693 | } |
a2932923 PM |
1694 | if ((flags & KVM_GET_HTAB_BOLTED_ONLY) && !(v & HPTE_V_BOLTED)) |
1695 | valid = 0; | |
a1b4a0f6 PM |
1696 | |
1697 | r = revp->guest_rpte; | |
a2932923 PM |
1698 | /* only clear modified if this is the right sort of entry */ |
1699 | if (valid == want_valid && dirty) { | |
1700 | r &= ~HPTE_GR_MODIFIED; | |
1701 | revp->guest_rpte = r; | |
1702 | } | |
a4bd6eb0 | 1703 | unlock_hpte(hptp, be64_to_cpu(hptp[0])); |
a2932923 PM |
1704 | preempt_enable(); |
1705 | if (!(valid == want_valid && (first_pass || dirty))) | |
1706 | ok = 0; | |
1707 | } | |
6f22bd32 AG |
1708 | hpte[0] = cpu_to_be64(v); |
1709 | hpte[1] = cpu_to_be64(r); | |
a2932923 PM |
1710 | return ok; |
1711 | } | |
1712 | ||
1713 | static ssize_t kvm_htab_read(struct file *file, char __user *buf, | |
1714 | size_t count, loff_t *ppos) | |
1715 | { | |
1716 | struct kvm_htab_ctx *ctx = file->private_data; | |
1717 | struct kvm *kvm = ctx->kvm; | |
1718 | struct kvm_get_htab_header hdr; | |
6f22bd32 | 1719 | __be64 *hptp; |
a2932923 PM |
1720 | struct revmap_entry *revp; |
1721 | unsigned long i, nb, nw; | |
1722 | unsigned long __user *lbuf; | |
1723 | struct kvm_get_htab_header __user *hptr; | |
1724 | unsigned long flags; | |
1725 | int first_pass; | |
1726 | unsigned long hpte[2]; | |
1727 | ||
96d4f267 | 1728 | if (!access_ok(buf, count)) |
a2932923 | 1729 | return -EFAULT; |
891f1ebf PM |
1730 | if (kvm_is_radix(kvm)) |
1731 | return 0; | |
a2932923 PM |
1732 | |
1733 | first_pass = ctx->first_pass; | |
1734 | flags = ctx->flags; | |
1735 | ||
1736 | i = ctx->index; | |
3f9d4f5a DG |
1737 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
1738 | revp = kvm->arch.hpt.rev + i; | |
a2932923 PM |
1739 | lbuf = (unsigned long __user *)buf; |
1740 | ||
1741 | nb = 0; | |
1742 | while (nb + sizeof(hdr) + HPTE_SIZE < count) { | |
1743 | /* Initialize header */ | |
1744 | hptr = (struct kvm_get_htab_header __user *)buf; | |
a2932923 PM |
1745 | hdr.n_valid = 0; |
1746 | hdr.n_invalid = 0; | |
1747 | nw = nb; | |
1748 | nb += sizeof(hdr); | |
1749 | lbuf = (unsigned long __user *)(buf + sizeof(hdr)); | |
1750 | ||
1751 | /* Skip uninteresting entries, i.e. clean on not-first pass */ | |
1752 | if (!first_pass) { | |
3d089f84 | 1753 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a1b4a0f6 | 1754 | !hpte_dirty(revp, hptp)) { |
a2932923 PM |
1755 | ++i; |
1756 | hptp += 2; | |
1757 | ++revp; | |
1758 | } | |
1759 | } | |
05dd85f7 | 1760 | hdr.index = i; |
a2932923 PM |
1761 | |
1762 | /* Grab a series of valid entries */ | |
3d089f84 | 1763 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1764 | hdr.n_valid < 0xffff && |
1765 | nb + HPTE_SIZE < count && | |
1766 | record_hpte(flags, hptp, hpte, revp, 1, first_pass)) { | |
1767 | /* valid entry, write it out */ | |
1768 | ++hdr.n_valid; | |
1769 | if (__put_user(hpte[0], lbuf) || | |
1770 | __put_user(hpte[1], lbuf + 1)) | |
1771 | return -EFAULT; | |
1772 | nb += HPTE_SIZE; | |
1773 | lbuf += 2; | |
1774 | ++i; | |
1775 | hptp += 2; | |
1776 | ++revp; | |
1777 | } | |
1778 | /* Now skip invalid entries while we can */ | |
3d089f84 | 1779 | while (i < kvmppc_hpt_npte(&kvm->arch.hpt) && |
a2932923 PM |
1780 | hdr.n_invalid < 0xffff && |
1781 | record_hpte(flags, hptp, hpte, revp, 0, first_pass)) { | |
1782 | /* found an invalid entry */ | |
1783 | ++hdr.n_invalid; | |
1784 | ++i; | |
1785 | hptp += 2; | |
1786 | ++revp; | |
1787 | } | |
1788 | ||
1789 | if (hdr.n_valid || hdr.n_invalid) { | |
1790 | /* write back the header */ | |
1791 | if (__copy_to_user(hptr, &hdr, sizeof(hdr))) | |
1792 | return -EFAULT; | |
1793 | nw = nb; | |
1794 | buf = (char __user *)lbuf; | |
1795 | } else { | |
1796 | nb = nw; | |
1797 | } | |
1798 | ||
1799 | /* Check if we've wrapped around the hash table */ | |
3d089f84 | 1800 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) { |
a2932923 PM |
1801 | i = 0; |
1802 | ctx->first_pass = 0; | |
1803 | break; | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | ctx->index = i; | |
1808 | ||
1809 | return nb; | |
1810 | } | |
1811 | ||
1812 | static ssize_t kvm_htab_write(struct file *file, const char __user *buf, | |
1813 | size_t count, loff_t *ppos) | |
1814 | { | |
1815 | struct kvm_htab_ctx *ctx = file->private_data; | |
1816 | struct kvm *kvm = ctx->kvm; | |
1817 | struct kvm_get_htab_header hdr; | |
1818 | unsigned long i, j; | |
1819 | unsigned long v, r; | |
1820 | unsigned long __user *lbuf; | |
6f22bd32 | 1821 | __be64 *hptp; |
a2932923 PM |
1822 | unsigned long tmp[2]; |
1823 | ssize_t nb; | |
1824 | long int err, ret; | |
1b151ce4 | 1825 | int mmu_ready; |
ded13fc1 | 1826 | int pshift; |
a2932923 | 1827 | |
96d4f267 | 1828 | if (!access_ok(buf, count)) |
a2932923 | 1829 | return -EFAULT; |
891f1ebf PM |
1830 | if (kvm_is_radix(kvm)) |
1831 | return -EINVAL; | |
a2932923 PM |
1832 | |
1833 | /* lock out vcpus from running while we're doing this */ | |
0d4ee88d | 1834 | mutex_lock(&kvm->arch.mmu_setup_lock); |
1b151ce4 PM |
1835 | mmu_ready = kvm->arch.mmu_ready; |
1836 | if (mmu_ready) { | |
1837 | kvm->arch.mmu_ready = 0; /* temporarily */ | |
1838 | /* order mmu_ready vs. vcpus_running */ | |
a2932923 PM |
1839 | smp_mb(); |
1840 | if (atomic_read(&kvm->arch.vcpus_running)) { | |
1b151ce4 | 1841 | kvm->arch.mmu_ready = 1; |
0d4ee88d | 1842 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
a2932923 PM |
1843 | return -EBUSY; |
1844 | } | |
1845 | } | |
1846 | ||
1847 | err = 0; | |
1848 | for (nb = 0; nb + sizeof(hdr) <= count; ) { | |
1849 | err = -EFAULT; | |
1850 | if (__copy_from_user(&hdr, buf, sizeof(hdr))) | |
1851 | break; | |
1852 | ||
1853 | err = 0; | |
1854 | if (nb + hdr.n_valid * HPTE_SIZE > count) | |
1855 | break; | |
1856 | ||
1857 | nb += sizeof(hdr); | |
1858 | buf += sizeof(hdr); | |
1859 | ||
1860 | err = -EINVAL; | |
1861 | i = hdr.index; | |
3d089f84 DG |
1862 | if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) || |
1863 | i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt)) | |
a2932923 PM |
1864 | break; |
1865 | ||
3f9d4f5a | 1866 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
a2932923 PM |
1867 | lbuf = (unsigned long __user *)buf; |
1868 | for (j = 0; j < hdr.n_valid; ++j) { | |
ffada016 CLG |
1869 | __be64 hpte_v; |
1870 | __be64 hpte_r; | |
1871 | ||
a2932923 | 1872 | err = -EFAULT; |
ffada016 CLG |
1873 | if (__get_user(hpte_v, lbuf) || |
1874 | __get_user(hpte_r, lbuf + 1)) | |
a2932923 | 1875 | goto out; |
ffada016 CLG |
1876 | v = be64_to_cpu(hpte_v); |
1877 | r = be64_to_cpu(hpte_r); | |
a2932923 PM |
1878 | err = -EINVAL; |
1879 | if (!(v & HPTE_V_VALID)) | |
1880 | goto out; | |
ded13fc1 PM |
1881 | pshift = kvmppc_hpte_base_page_shift(v, r); |
1882 | if (pshift <= 0) | |
1883 | goto out; | |
a2932923 PM |
1884 | lbuf += 2; |
1885 | nb += HPTE_SIZE; | |
1886 | ||
6f22bd32 | 1887 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1888 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1889 | err = -EIO; | |
1890 | ret = kvmppc_virtmode_do_h_enter(kvm, H_EXACT, i, v, r, | |
1891 | tmp); | |
1892 | if (ret != H_SUCCESS) { | |
61119786 | 1893 | pr_err("%s ret %ld i=%ld v=%lx r=%lx\n", __func__, ret, i, v, r); |
a2932923 PM |
1894 | goto out; |
1895 | } | |
1b151ce4 | 1896 | if (!mmu_ready && is_vrma_hpte(v)) { |
ded13fc1 | 1897 | unsigned long senc, lpcr; |
a2932923 | 1898 | |
ded13fc1 | 1899 | senc = slb_pgsize_encoding(1ul << pshift); |
a2932923 PM |
1900 | kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | |
1901 | (VRMA_VSID << SLB_VSID_SHIFT_1T); | |
ded13fc1 PM |
1902 | if (!cpu_has_feature(CPU_FTR_ARCH_300)) { |
1903 | lpcr = senc << (LPCR_VRMASD_SH - 4); | |
1904 | kvmppc_update_lpcr(kvm, lpcr, | |
1905 | LPCR_VRMASD); | |
1906 | } else { | |
1907 | kvmppc_setup_partition_table(kvm); | |
1908 | } | |
1b151ce4 | 1909 | mmu_ready = 1; |
a2932923 PM |
1910 | } |
1911 | ++i; | |
1912 | hptp += 2; | |
1913 | } | |
1914 | ||
1915 | for (j = 0; j < hdr.n_invalid; ++j) { | |
6f22bd32 | 1916 | if (be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)) |
a2932923 PM |
1917 | kvmppc_do_h_remove(kvm, 0, i, 0, tmp); |
1918 | ++i; | |
1919 | hptp += 2; | |
1920 | } | |
1921 | err = 0; | |
1922 | } | |
1923 | ||
1924 | out: | |
1b151ce4 | 1925 | /* Order HPTE updates vs. mmu_ready */ |
a2932923 | 1926 | smp_wmb(); |
1b151ce4 | 1927 | kvm->arch.mmu_ready = mmu_ready; |
0d4ee88d | 1928 | mutex_unlock(&kvm->arch.mmu_setup_lock); |
a2932923 PM |
1929 | |
1930 | if (err) | |
1931 | return err; | |
1932 | return nb; | |
1933 | } | |
1934 | ||
1935 | static int kvm_htab_release(struct inode *inode, struct file *filp) | |
1936 | { | |
1937 | struct kvm_htab_ctx *ctx = filp->private_data; | |
1938 | ||
1939 | filp->private_data = NULL; | |
1940 | if (!(ctx->flags & KVM_GET_HTAB_WRITE)) | |
1941 | atomic_dec(&ctx->kvm->arch.hpte_mod_interest); | |
1942 | kvm_put_kvm(ctx->kvm); | |
1943 | kfree(ctx); | |
1944 | return 0; | |
1945 | } | |
1946 | ||
75ef9de1 | 1947 | static const struct file_operations kvm_htab_fops = { |
a2932923 PM |
1948 | .read = kvm_htab_read, |
1949 | .write = kvm_htab_write, | |
1950 | .llseek = default_llseek, | |
1951 | .release = kvm_htab_release, | |
1952 | }; | |
1953 | ||
1954 | int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf) | |
1955 | { | |
1956 | int ret; | |
1957 | struct kvm_htab_ctx *ctx; | |
1958 | int rwflag; | |
1959 | ||
1960 | /* reject flags we don't recognize */ | |
1961 | if (ghf->flags & ~(KVM_GET_HTAB_BOLTED_ONLY | KVM_GET_HTAB_WRITE)) | |
1962 | return -EINVAL; | |
1963 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1964 | if (!ctx) | |
1965 | return -ENOMEM; | |
1966 | kvm_get_kvm(kvm); | |
1967 | ctx->kvm = kvm; | |
1968 | ctx->index = ghf->start_index; | |
1969 | ctx->flags = ghf->flags; | |
1970 | ctx->first_pass = 1; | |
1971 | ||
1972 | rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; | |
2f84d5ea | 1973 | ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC); |
a2932923 | 1974 | if (ret < 0) { |
43f6b0cf | 1975 | kfree(ctx); |
149487bd | 1976 | kvm_put_kvm_no_destroy(kvm); |
a2932923 PM |
1977 | return ret; |
1978 | } | |
1979 | ||
1980 | if (rwflag == O_RDONLY) { | |
1981 | mutex_lock(&kvm->slots_lock); | |
1982 | atomic_inc(&kvm->arch.hpte_mod_interest); | |
1983 | /* make sure kvmppc_do_h_enter etc. see the increment */ | |
1984 | synchronize_srcu_expedited(&kvm->srcu); | |
1985 | mutex_unlock(&kvm->slots_lock); | |
1986 | } | |
1987 | ||
1988 | return ret; | |
1989 | } | |
1990 | ||
e23a808b PM |
1991 | struct debugfs_htab_state { |
1992 | struct kvm *kvm; | |
1993 | struct mutex mutex; | |
1994 | unsigned long hpt_index; | |
1995 | int chars_left; | |
1996 | int buf_index; | |
1997 | char buf[64]; | |
1998 | }; | |
1999 | ||
2000 | static int debugfs_htab_open(struct inode *inode, struct file *file) | |
2001 | { | |
2002 | struct kvm *kvm = inode->i_private; | |
2003 | struct debugfs_htab_state *p; | |
2004 | ||
2005 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
2006 | if (!p) | |
2007 | return -ENOMEM; | |
2008 | ||
2009 | kvm_get_kvm(kvm); | |
2010 | p->kvm = kvm; | |
2011 | mutex_init(&p->mutex); | |
2012 | file->private_data = p; | |
2013 | ||
2014 | return nonseekable_open(inode, file); | |
2015 | } | |
2016 | ||
2017 | static int debugfs_htab_release(struct inode *inode, struct file *file) | |
2018 | { | |
2019 | struct debugfs_htab_state *p = file->private_data; | |
2020 | ||
2021 | kvm_put_kvm(p->kvm); | |
2022 | kfree(p); | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | static ssize_t debugfs_htab_read(struct file *file, char __user *buf, | |
2027 | size_t len, loff_t *ppos) | |
2028 | { | |
2029 | struct debugfs_htab_state *p = file->private_data; | |
2030 | ssize_t ret, r; | |
2031 | unsigned long i, n; | |
2032 | unsigned long v, hr, gr; | |
2033 | struct kvm *kvm; | |
2034 | __be64 *hptp; | |
2035 | ||
891f1ebf PM |
2036 | kvm = p->kvm; |
2037 | if (kvm_is_radix(kvm)) | |
2038 | return 0; | |
2039 | ||
e23a808b PM |
2040 | ret = mutex_lock_interruptible(&p->mutex); |
2041 | if (ret) | |
2042 | return ret; | |
2043 | ||
2044 | if (p->chars_left) { | |
2045 | n = p->chars_left; | |
2046 | if (n > len) | |
2047 | n = len; | |
2048 | r = copy_to_user(buf, p->buf + p->buf_index, n); | |
2049 | n -= r; | |
2050 | p->chars_left -= n; | |
2051 | p->buf_index += n; | |
2052 | buf += n; | |
2053 | len -= n; | |
2054 | ret = n; | |
2055 | if (r) { | |
2056 | if (!n) | |
2057 | ret = -EFAULT; | |
2058 | goto out; | |
2059 | } | |
2060 | } | |
2061 | ||
e23a808b | 2062 | i = p->hpt_index; |
3f9d4f5a | 2063 | hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE)); |
3d089f84 DG |
2064 | for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt); |
2065 | ++i, hptp += 2) { | |
e23a808b PM |
2066 | if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT))) |
2067 | continue; | |
2068 | ||
2069 | /* lock the HPTE so it's stable and read it */ | |
2070 | preempt_disable(); | |
2071 | while (!try_lock_hpte(hptp, HPTE_V_HVLOCK)) | |
2072 | cpu_relax(); | |
2073 | v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK; | |
2074 | hr = be64_to_cpu(hptp[1]); | |
3f9d4f5a | 2075 | gr = kvm->arch.hpt.rev[i].guest_rpte; |
e23a808b PM |
2076 | unlock_hpte(hptp, v); |
2077 | preempt_enable(); | |
2078 | ||
2079 | if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT))) | |
2080 | continue; | |
2081 | ||
2082 | n = scnprintf(p->buf, sizeof(p->buf), | |
2083 | "%6lx %.16lx %.16lx %.16lx\n", | |
2084 | i, v, hr, gr); | |
2085 | p->chars_left = n; | |
2086 | if (n > len) | |
2087 | n = len; | |
2088 | r = copy_to_user(buf, p->buf, n); | |
2089 | n -= r; | |
2090 | p->chars_left -= n; | |
2091 | p->buf_index = n; | |
2092 | buf += n; | |
2093 | len -= n; | |
2094 | ret += n; | |
2095 | if (r) { | |
2096 | if (!ret) | |
2097 | ret = -EFAULT; | |
2098 | goto out; | |
2099 | } | |
2100 | } | |
2101 | p->hpt_index = i; | |
2102 | ||
2103 | out: | |
2104 | mutex_unlock(&p->mutex); | |
2105 | return ret; | |
2106 | } | |
2107 | ||
025c9511 | 2108 | static ssize_t debugfs_htab_write(struct file *file, const char __user *buf, |
e23a808b PM |
2109 | size_t len, loff_t *ppos) |
2110 | { | |
2111 | return -EACCES; | |
2112 | } | |
2113 | ||
2114 | static const struct file_operations debugfs_htab_fops = { | |
2115 | .owner = THIS_MODULE, | |
2116 | .open = debugfs_htab_open, | |
2117 | .release = debugfs_htab_release, | |
2118 | .read = debugfs_htab_read, | |
2119 | .write = debugfs_htab_write, | |
2120 | .llseek = generic_file_llseek, | |
2121 | }; | |
2122 | ||
2123 | void kvmppc_mmu_debugfs_init(struct kvm *kvm) | |
2124 | { | |
faf01aef | 2125 | debugfs_create_file("htab", 0400, kvm->debugfs_dentry, kvm, |
c4fd527f | 2126 | &debugfs_htab_fops); |
e23a808b PM |
2127 | } |
2128 | ||
de56a948 PM |
2129 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
2130 | { | |
2131 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
2132 | ||
c17b98cf | 2133 | vcpu->arch.slb_nr = 32; /* POWER7/POWER8 */ |
de56a948 | 2134 | |
18c3640c | 2135 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; |
de56a948 PM |
2136 | |
2137 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; | |
2138 | } |