Commit | Line | Data |
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a8606e20 PM |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> | |
7 | */ | |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/string.h> | |
11 | #include <linux/kvm.h> | |
12 | #include <linux/kvm_host.h> | |
13 | #include <linux/hugetlb.h> | |
c77162de | 14 | #include <linux/module.h> |
a8606e20 PM |
15 | |
16 | #include <asm/tlbflush.h> | |
17 | #include <asm/kvm_ppc.h> | |
18 | #include <asm/kvm_book3s.h> | |
19 | #include <asm/mmu-hash64.h> | |
20 | #include <asm/hvcall.h> | |
21 | #include <asm/synch.h> | |
22 | #include <asm/ppc-opcode.h> | |
23 | ||
8936dda4 PM |
24 | /* Translate address of a vmalloc'd thing to a linear map address */ |
25 | static void *real_vmalloc_addr(void *x) | |
26 | { | |
27 | unsigned long addr = (unsigned long) x; | |
28 | pte_t *p; | |
691e95fd AK |
29 | /* |
30 | * assume we don't have huge pages in vmalloc space... | |
31 | * So don't worry about THP collapse/split. Called | |
32 | * Only in realmode, hence won't need irq_save/restore. | |
33 | */ | |
34 | p = __find_linux_pte_or_hugepte(swapper_pg_dir, addr, NULL); | |
8936dda4 PM |
35 | if (!p || !pte_present(*p)) |
36 | return NULL; | |
8936dda4 PM |
37 | addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); |
38 | return __va(addr); | |
39 | } | |
a8606e20 | 40 | |
1b400ba0 PM |
41 | /* Return 1 if we need to do a global tlbie, 0 if we can use tlbiel */ |
42 | static int global_invalidates(struct kvm *kvm, unsigned long flags) | |
43 | { | |
44 | int global; | |
45 | ||
46 | /* | |
47 | * If there is only one vcore, and it's currently running, | |
55765483 | 48 | * as indicated by local_paca->kvm_hstate.kvm_vcpu being set, |
1b400ba0 PM |
49 | * we can use tlbiel as long as we mark all other physical |
50 | * cores as potentially having stale TLB entries for this lpid. | |
1b400ba0 PM |
51 | * Otherwise, don't use tlbiel. |
52 | */ | |
55765483 | 53 | if (kvm->arch.online_vcores == 1 && local_paca->kvm_hstate.kvm_vcpu) |
1b400ba0 | 54 | global = 0; |
1b400ba0 | 55 | else |
c17b98cf | 56 | global = 1; |
1b400ba0 PM |
57 | |
58 | if (!global) { | |
59 | /* any other core might now have stale TLB entries... */ | |
60 | smp_wmb(); | |
61 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
62 | cpumask_clear_cpu(local_paca->kvm_hstate.kvm_vcore->pcpu, | |
63 | &kvm->arch.need_tlb_flush); | |
64 | } | |
65 | ||
66 | return global; | |
67 | } | |
68 | ||
06ce2c63 PM |
69 | /* |
70 | * Add this HPTE into the chain for the real page. | |
71 | * Must be called with the chain locked; it unlocks the chain. | |
72 | */ | |
342d3db7 | 73 | void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, |
06ce2c63 PM |
74 | unsigned long *rmap, long pte_index, int realmode) |
75 | { | |
76 | struct revmap_entry *head, *tail; | |
77 | unsigned long i; | |
78 | ||
79 | if (*rmap & KVMPPC_RMAP_PRESENT) { | |
80 | i = *rmap & KVMPPC_RMAP_INDEX; | |
81 | head = &kvm->arch.revmap[i]; | |
82 | if (realmode) | |
83 | head = real_vmalloc_addr(head); | |
84 | tail = &kvm->arch.revmap[head->back]; | |
85 | if (realmode) | |
86 | tail = real_vmalloc_addr(tail); | |
87 | rev->forw = i; | |
88 | rev->back = head->back; | |
89 | tail->forw = pte_index; | |
90 | head->back = pte_index; | |
91 | } else { | |
92 | rev->forw = rev->back = pte_index; | |
4879f241 PM |
93 | *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | |
94 | pte_index | KVMPPC_RMAP_PRESENT; | |
06ce2c63 | 95 | } |
4879f241 | 96 | unlock_rmap(rmap); |
06ce2c63 | 97 | } |
342d3db7 | 98 | EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain); |
06ce2c63 PM |
99 | |
100 | /* Remove this HPTE from the chain for a real page */ | |
101 | static void remove_revmap_chain(struct kvm *kvm, long pte_index, | |
bad3b507 PM |
102 | struct revmap_entry *rev, |
103 | unsigned long hpte_v, unsigned long hpte_r) | |
06ce2c63 | 104 | { |
bad3b507 | 105 | struct revmap_entry *next, *prev; |
06ce2c63 PM |
106 | unsigned long gfn, ptel, head; |
107 | struct kvm_memory_slot *memslot; | |
108 | unsigned long *rmap; | |
bad3b507 | 109 | unsigned long rcbits; |
06ce2c63 | 110 | |
bad3b507 PM |
111 | rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); |
112 | ptel = rev->guest_rpte |= rcbits; | |
06ce2c63 | 113 | gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); |
797f9c07 | 114 | memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); |
dfe49dbd | 115 | if (!memslot) |
06ce2c63 PM |
116 | return; |
117 | ||
d89cc617 | 118 | rmap = real_vmalloc_addr(&memslot->arch.rmap[gfn - memslot->base_gfn]); |
06ce2c63 PM |
119 | lock_rmap(rmap); |
120 | ||
121 | head = *rmap & KVMPPC_RMAP_INDEX; | |
122 | next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]); | |
123 | prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]); | |
124 | next->back = rev->back; | |
125 | prev->forw = rev->forw; | |
126 | if (head == pte_index) { | |
127 | head = rev->forw; | |
128 | if (head == pte_index) | |
129 | *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); | |
130 | else | |
131 | *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; | |
132 | } | |
bad3b507 | 133 | *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT; |
06ce2c63 PM |
134 | unlock_rmap(rmap); |
135 | } | |
136 | ||
7ed661bf PM |
137 | long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, |
138 | long pte_index, unsigned long pteh, unsigned long ptel, | |
139 | pgd_t *pgdir, bool realmode, unsigned long *pte_idx_ret) | |
a8606e20 | 140 | { |
c77162de | 141 | unsigned long i, pa, gpa, gfn, psize; |
342d3db7 | 142 | unsigned long slot_fn, hva; |
6f22bd32 | 143 | __be64 *hpte; |
8936dda4 | 144 | struct revmap_entry *rev; |
44e5f6be | 145 | unsigned long g_ptel; |
b2b2f165 | 146 | struct kvm_memory_slot *memslot; |
dac56570 | 147 | unsigned hpage_shift; |
9d0ef5ea | 148 | unsigned long is_io; |
06ce2c63 | 149 | unsigned long *rmap; |
dac56570 | 150 | pte_t *ptep; |
4cf302bc | 151 | unsigned int writing; |
342d3db7 | 152 | unsigned long mmu_seq; |
691e95fd | 153 | unsigned long rcbits, irq_flags = 0; |
c77162de PM |
154 | |
155 | psize = hpte_page_size(pteh, ptel); | |
156 | if (!psize) | |
a8606e20 | 157 | return H_PARAMETER; |
4cf302bc | 158 | writing = hpte_is_writable(ptel); |
697d3899 | 159 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
44e5f6be PM |
160 | ptel &= ~HPTE_GR_RESERVED; |
161 | g_ptel = ptel; | |
b2b2f165 | 162 | |
342d3db7 PM |
163 | /* used later to detect if we might have been invalidated */ |
164 | mmu_seq = kvm->mmu_notifier_seq; | |
165 | smp_rmb(); | |
166 | ||
c77162de PM |
167 | /* Find the memslot (if any) for this address */ |
168 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); | |
169 | gfn = gpa >> PAGE_SHIFT; | |
797f9c07 | 170 | memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); |
697d3899 | 171 | pa = 0; |
342d3db7 | 172 | is_io = ~0ul; |
697d3899 PM |
173 | rmap = NULL; |
174 | if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { | |
697d3899 PM |
175 | /* Emulated MMIO - mark this with key=31 */ |
176 | pteh |= HPTE_V_ABSENT; | |
177 | ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
178 | goto do_insert; | |
179 | } | |
da9d1d7f PM |
180 | |
181 | /* Check if the requested page fits entirely in the memslot. */ | |
182 | if (!slot_is_aligned(memslot, psize)) | |
183 | return H_PARAMETER; | |
c77162de | 184 | slot_fn = gfn - memslot->base_gfn; |
d89cc617 | 185 | rmap = &memslot->arch.rmap[slot_fn]; |
c77162de | 186 | |
c17b98cf PM |
187 | /* Translate to host virtual address */ |
188 | hva = __gfn_to_hva_memslot(memslot, gfn); | |
691e95fd AK |
189 | /* |
190 | * If we had a page table table change after lookup, we would | |
191 | * retry via mmu_notifier_retry. | |
192 | */ | |
193 | if (realmode) | |
194 | ptep = __find_linux_pte_or_hugepte(pgdir, hva, &hpage_shift); | |
195 | else { | |
196 | local_irq_save(irq_flags); | |
197 | ptep = find_linux_pte_or_hugepte(pgdir, hva, &hpage_shift); | |
342d3db7 | 198 | } |
dac56570 AK |
199 | if (ptep) { |
200 | pte_t pte; | |
201 | unsigned int host_pte_size; | |
7ed661bf | 202 | |
dac56570 AK |
203 | if (hpage_shift) |
204 | host_pte_size = 1ul << hpage_shift; | |
205 | else | |
206 | host_pte_size = PAGE_SIZE; | |
207 | /* | |
208 | * We should always find the guest page size | |
209 | * to <= host page size, if host is using hugepage | |
210 | */ | |
691e95fd AK |
211 | if (host_pte_size < psize) { |
212 | if (!realmode) | |
213 | local_irq_restore(flags); | |
dac56570 | 214 | return H_PARAMETER; |
691e95fd | 215 | } |
7d6e7f7f | 216 | pte = kvmppc_read_update_linux_pte(ptep, writing); |
dac56570 AK |
217 | if (pte_present(pte) && !pte_protnone(pte)) { |
218 | if (writing && !pte_write(pte)) | |
219 | /* make the actual HPTE be read-only */ | |
220 | ptel = hpte_make_readonly(ptel); | |
221 | is_io = hpte_cache_bits(pte_val(pte)); | |
222 | pa = pte_pfn(pte) << PAGE_SHIFT; | |
223 | pa |= hva & (host_pte_size - 1); | |
224 | pa |= gpa & ~PAGE_MASK; | |
225 | } | |
226 | } | |
691e95fd AK |
227 | if (!realmode) |
228 | local_irq_restore(irq_flags); | |
c77162de PM |
229 | |
230 | ptel &= ~(HPTE_R_PP0 - psize); | |
231 | ptel |= pa; | |
342d3db7 PM |
232 | |
233 | if (pa) | |
234 | pteh |= HPTE_V_VALID; | |
235 | else | |
236 | pteh |= HPTE_V_ABSENT; | |
c77162de | 237 | |
a8606e20 | 238 | /* Check WIMG */ |
342d3db7 | 239 | if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) { |
9d0ef5ea PM |
240 | if (is_io) |
241 | return H_PARAMETER; | |
242 | /* | |
243 | * Allow guest to map emulated device memory as | |
244 | * uncacheable, but actually make it cacheable. | |
245 | */ | |
246 | ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); | |
247 | ptel |= HPTE_R_M; | |
248 | } | |
075295dd | 249 | |
342d3db7 | 250 | /* Find and lock the HPTEG slot to use */ |
697d3899 | 251 | do_insert: |
32fad281 | 252 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
253 | return H_PARAMETER; |
254 | if (likely((flags & H_EXACT) == 0)) { | |
255 | pte_index &= ~7UL; | |
6f22bd32 | 256 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 257 | for (i = 0; i < 8; ++i) { |
6f22bd32 | 258 | if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0 && |
697d3899 PM |
259 | try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
260 | HPTE_V_ABSENT)) | |
a8606e20 PM |
261 | break; |
262 | hpte += 2; | |
263 | } | |
075295dd PM |
264 | if (i == 8) { |
265 | /* | |
266 | * Since try_lock_hpte doesn't retry (not even stdcx. | |
267 | * failures), it could be that there is a free slot | |
268 | * but we transiently failed to lock it. Try again, | |
269 | * actually locking each slot and checking it. | |
270 | */ | |
271 | hpte -= 16; | |
272 | for (i = 0; i < 8; ++i) { | |
6f22bd32 | 273 | u64 pte; |
075295dd PM |
274 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
275 | cpu_relax(); | |
a4bd6eb0 | 276 | pte = be64_to_cpu(hpte[0]); |
6f22bd32 | 277 | if (!(pte & (HPTE_V_VALID | HPTE_V_ABSENT))) |
075295dd | 278 | break; |
a4bd6eb0 | 279 | __unlock_hpte(hpte, pte); |
075295dd PM |
280 | hpte += 2; |
281 | } | |
282 | if (i == 8) | |
283 | return H_PTEG_FULL; | |
284 | } | |
8936dda4 | 285 | pte_index += i; |
a8606e20 | 286 | } else { |
6f22bd32 | 287 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
697d3899 PM |
288 | if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
289 | HPTE_V_ABSENT)) { | |
075295dd | 290 | /* Lock the slot and check again */ |
6f22bd32 AG |
291 | u64 pte; |
292 | ||
075295dd PM |
293 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
294 | cpu_relax(); | |
a4bd6eb0 | 295 | pte = be64_to_cpu(hpte[0]); |
6f22bd32 | 296 | if (pte & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
a4bd6eb0 | 297 | __unlock_hpte(hpte, pte); |
075295dd PM |
298 | return H_PTEG_FULL; |
299 | } | |
300 | } | |
a8606e20 | 301 | } |
8936dda4 PM |
302 | |
303 | /* Save away the guest's idea of the second HPTE dword */ | |
06ce2c63 PM |
304 | rev = &kvm->arch.revmap[pte_index]; |
305 | if (realmode) | |
306 | rev = real_vmalloc_addr(rev); | |
44e5f6be | 307 | if (rev) { |
8936dda4 | 308 | rev->guest_rpte = g_ptel; |
44e5f6be PM |
309 | note_hpte_modification(kvm, rev); |
310 | } | |
06ce2c63 PM |
311 | |
312 | /* Link HPTE into reverse-map chain */ | |
697d3899 PM |
313 | if (pteh & HPTE_V_VALID) { |
314 | if (realmode) | |
315 | rmap = real_vmalloc_addr(rmap); | |
316 | lock_rmap(rmap); | |
342d3db7 | 317 | /* Check for pending invalidations under the rmap chain lock */ |
c17b98cf | 318 | if (mmu_notifier_retry(kvm, mmu_seq)) { |
342d3db7 PM |
319 | /* inval in progress, write a non-present HPTE */ |
320 | pteh |= HPTE_V_ABSENT; | |
321 | pteh &= ~HPTE_V_VALID; | |
322 | unlock_rmap(rmap); | |
323 | } else { | |
324 | kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, | |
325 | realmode); | |
bad3b507 PM |
326 | /* Only set R/C in real HPTE if already set in *rmap */ |
327 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
328 | ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
342d3db7 | 329 | } |
697d3899 | 330 | } |
06ce2c63 | 331 | |
6f22bd32 | 332 | hpte[1] = cpu_to_be64(ptel); |
06ce2c63 PM |
333 | |
334 | /* Write the first HPTE dword, unlocking the HPTE and making it valid */ | |
a8606e20 | 335 | eieio(); |
a4bd6eb0 | 336 | __unlock_hpte(hpte, pteh); |
a8606e20 | 337 | asm volatile("ptesync" : : : "memory"); |
06ce2c63 | 338 | |
7ed661bf | 339 | *pte_idx_ret = pte_index; |
a8606e20 PM |
340 | return H_SUCCESS; |
341 | } | |
7ed661bf PM |
342 | EXPORT_SYMBOL_GPL(kvmppc_do_h_enter); |
343 | ||
344 | long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, | |
345 | long pte_index, unsigned long pteh, unsigned long ptel) | |
346 | { | |
347 | return kvmppc_do_h_enter(vcpu->kvm, flags, pte_index, pteh, ptel, | |
348 | vcpu->arch.pgdir, true, &vcpu->arch.gpr[4]); | |
349 | } | |
a8606e20 | 350 | |
54bb7f4b | 351 | #ifdef __BIG_ENDIAN__ |
a8606e20 | 352 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) |
54bb7f4b AB |
353 | #else |
354 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->paca_index)) | |
355 | #endif | |
a8606e20 PM |
356 | |
357 | static inline int try_lock_tlbie(unsigned int *lock) | |
358 | { | |
359 | unsigned int tmp, old; | |
360 | unsigned int token = LOCK_TOKEN; | |
361 | ||
362 | asm volatile("1:lwarx %1,0,%2\n" | |
363 | " cmpwi cr0,%1,0\n" | |
364 | " bne 2f\n" | |
365 | " stwcx. %3,0,%2\n" | |
366 | " bne- 1b\n" | |
367 | " isync\n" | |
368 | "2:" | |
369 | : "=&r" (tmp), "=&r" (old) | |
370 | : "r" (lock), "r" (token) | |
371 | : "cc", "memory"); | |
372 | return old == 0; | |
373 | } | |
374 | ||
54480501 PM |
375 | static void do_tlbies(struct kvm *kvm, unsigned long *rbvalues, |
376 | long npages, int global, bool need_sync) | |
377 | { | |
378 | long i; | |
379 | ||
54480501 PM |
380 | if (global) { |
381 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) | |
382 | cpu_relax(); | |
383 | if (need_sync) | |
384 | asm volatile("ptesync" : : : "memory"); | |
385 | for (i = 0; i < npages; ++i) | |
386 | asm volatile(PPC_TLBIE(%1,%0) : : | |
387 | "r" (rbvalues[i]), "r" (kvm->arch.lpid)); | |
388 | asm volatile("eieio; tlbsync; ptesync" : : : "memory"); | |
389 | kvm->arch.tlbie_lock = 0; | |
390 | } else { | |
391 | if (need_sync) | |
392 | asm volatile("ptesync" : : : "memory"); | |
393 | for (i = 0; i < npages; ++i) | |
394 | asm volatile("tlbiel %0" : : "r" (rbvalues[i])); | |
395 | asm volatile("ptesync" : : : "memory"); | |
396 | } | |
397 | } | |
398 | ||
6b445ad4 PM |
399 | long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags, |
400 | unsigned long pte_index, unsigned long avpn, | |
401 | unsigned long *hpret) | |
a8606e20 | 402 | { |
6f22bd32 | 403 | __be64 *hpte; |
a8606e20 | 404 | unsigned long v, r, rb; |
a92bce95 | 405 | struct revmap_entry *rev; |
6f22bd32 | 406 | u64 pte; |
a8606e20 | 407 | |
32fad281 | 408 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 | 409 | return H_PARAMETER; |
6f22bd32 | 410 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 411 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 412 | cpu_relax(); |
6f22bd32 AG |
413 | pte = be64_to_cpu(hpte[0]); |
414 | if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || | |
415 | ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) || | |
416 | ((flags & H_ANDCOND) && (pte & avpn) != 0)) { | |
a4bd6eb0 | 417 | __unlock_hpte(hpte, pte); |
a8606e20 PM |
418 | return H_NOT_FOUND; |
419 | } | |
a92bce95 PM |
420 | |
421 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
6f22bd32 | 422 | v = pte & ~HPTE_V_HVLOCK; |
a92bce95 | 423 | if (v & HPTE_V_VALID) { |
6f22bd32 AG |
424 | u64 pte1; |
425 | ||
426 | pte1 = be64_to_cpu(hpte[1]); | |
427 | hpte[0] &= ~cpu_to_be64(HPTE_V_VALID); | |
428 | rb = compute_tlbie_rb(v, pte1, pte_index); | |
54480501 | 429 | do_tlbies(kvm, &rb, 1, global_invalidates(kvm, flags), true); |
bad3b507 | 430 | /* Read PTE low word after tlbie to get final R/C values */ |
6f22bd32 | 431 | remove_revmap_chain(kvm, pte_index, rev, v, pte1); |
a8606e20 | 432 | } |
44e5f6be PM |
433 | r = rev->guest_rpte & ~HPTE_GR_RESERVED; |
434 | note_hpte_modification(kvm, rev); | |
a92bce95 PM |
435 | unlock_hpte(hpte, 0); |
436 | ||
6b445ad4 PM |
437 | hpret[0] = v; |
438 | hpret[1] = r; | |
a8606e20 PM |
439 | return H_SUCCESS; |
440 | } | |
6b445ad4 PM |
441 | EXPORT_SYMBOL_GPL(kvmppc_do_h_remove); |
442 | ||
443 | long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, | |
444 | unsigned long pte_index, unsigned long avpn) | |
445 | { | |
446 | return kvmppc_do_h_remove(vcpu->kvm, flags, pte_index, avpn, | |
447 | &vcpu->arch.gpr[4]); | |
448 | } | |
a8606e20 PM |
449 | |
450 | long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) | |
451 | { | |
452 | struct kvm *kvm = vcpu->kvm; | |
453 | unsigned long *args = &vcpu->arch.gpr[4]; | |
6f22bd32 AG |
454 | __be64 *hp, *hptes[4]; |
455 | unsigned long tlbrb[4]; | |
a92bce95 PM |
456 | long int i, j, k, n, found, indexes[4]; |
457 | unsigned long flags, req, pte_index, rcbits; | |
54480501 | 458 | int global; |
a8606e20 | 459 | long int ret = H_SUCCESS; |
a92bce95 | 460 | struct revmap_entry *rev, *revs[4]; |
6f22bd32 | 461 | u64 hp0; |
a8606e20 | 462 | |
54480501 | 463 | global = global_invalidates(kvm, 0); |
a92bce95 PM |
464 | for (i = 0; i < 4 && ret == H_SUCCESS; ) { |
465 | n = 0; | |
466 | for (; i < 4; ++i) { | |
467 | j = i * 2; | |
468 | pte_index = args[j]; | |
469 | flags = pte_index >> 56; | |
470 | pte_index &= ((1ul << 56) - 1); | |
471 | req = flags >> 6; | |
472 | flags &= 3; | |
473 | if (req == 3) { /* no more requests */ | |
474 | i = 4; | |
a8606e20 | 475 | break; |
a92bce95 | 476 | } |
32fad281 PM |
477 | if (req != 1 || flags == 3 || |
478 | pte_index >= kvm->arch.hpt_npte) { | |
a92bce95 PM |
479 | /* parameter error */ |
480 | args[j] = ((0xa0 | flags) << 56) + pte_index; | |
481 | ret = H_PARAMETER; | |
a8606e20 | 482 | break; |
a92bce95 | 483 | } |
6f22bd32 | 484 | hp = (__be64 *) (kvm->arch.hpt_virt + (pte_index << 4)); |
a92bce95 PM |
485 | /* to avoid deadlock, don't spin except for first */ |
486 | if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) { | |
487 | if (n) | |
488 | break; | |
489 | while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) | |
490 | cpu_relax(); | |
491 | } | |
492 | found = 0; | |
6f22bd32 AG |
493 | hp0 = be64_to_cpu(hp[0]); |
494 | if (hp0 & (HPTE_V_ABSENT | HPTE_V_VALID)) { | |
a92bce95 PM |
495 | switch (flags & 3) { |
496 | case 0: /* absolute */ | |
a8606e20 | 497 | found = 1; |
a92bce95 PM |
498 | break; |
499 | case 1: /* andcond */ | |
6f22bd32 | 500 | if (!(hp0 & args[j + 1])) |
a92bce95 PM |
501 | found = 1; |
502 | break; | |
503 | case 2: /* AVPN */ | |
6f22bd32 | 504 | if ((hp0 & ~0x7fUL) == args[j + 1]) |
a92bce95 PM |
505 | found = 1; |
506 | break; | |
507 | } | |
508 | } | |
509 | if (!found) { | |
6f22bd32 | 510 | hp[0] &= ~cpu_to_be64(HPTE_V_HVLOCK); |
a92bce95 PM |
511 | args[j] = ((0x90 | flags) << 56) + pte_index; |
512 | continue; | |
a8606e20 | 513 | } |
a92bce95 PM |
514 | |
515 | args[j] = ((0x80 | flags) << 56) + pte_index; | |
516 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
44e5f6be | 517 | note_hpte_modification(kvm, rev); |
a92bce95 | 518 | |
6f22bd32 | 519 | if (!(hp0 & HPTE_V_VALID)) { |
bad3b507 PM |
520 | /* insert R and C bits from PTE */ |
521 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); | |
522 | args[j] |= rcbits << (56 - 5); | |
51bfd299 | 523 | hp[0] = 0; |
a92bce95 | 524 | continue; |
bad3b507 | 525 | } |
a92bce95 | 526 | |
6f22bd32 AG |
527 | /* leave it locked */ |
528 | hp[0] &= ~cpu_to_be64(HPTE_V_VALID); | |
529 | tlbrb[n] = compute_tlbie_rb(be64_to_cpu(hp[0]), | |
530 | be64_to_cpu(hp[1]), pte_index); | |
a92bce95 PM |
531 | indexes[n] = j; |
532 | hptes[n] = hp; | |
533 | revs[n] = rev; | |
534 | ++n; | |
a8606e20 | 535 | } |
a92bce95 PM |
536 | |
537 | if (!n) | |
538 | break; | |
539 | ||
540 | /* Now that we've collected a batch, do the tlbies */ | |
54480501 | 541 | do_tlbies(kvm, tlbrb, n, global, true); |
a92bce95 | 542 | |
bad3b507 | 543 | /* Read PTE low words after tlbie to get final R/C values */ |
a92bce95 PM |
544 | for (k = 0; k < n; ++k) { |
545 | j = indexes[k]; | |
546 | pte_index = args[j] & ((1ul << 56) - 1); | |
547 | hp = hptes[k]; | |
548 | rev = revs[k]; | |
6f22bd32 AG |
549 | remove_revmap_chain(kvm, pte_index, rev, |
550 | be64_to_cpu(hp[0]), be64_to_cpu(hp[1])); | |
bad3b507 PM |
551 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); |
552 | args[j] |= rcbits << (56 - 5); | |
a4bd6eb0 | 553 | __unlock_hpte(hp, 0); |
697d3899 | 554 | } |
a8606e20 | 555 | } |
a92bce95 | 556 | |
a8606e20 PM |
557 | return ret; |
558 | } | |
559 | ||
560 | long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, | |
561 | unsigned long pte_index, unsigned long avpn, | |
562 | unsigned long va) | |
563 | { | |
564 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 | 565 | __be64 *hpte; |
8936dda4 PM |
566 | struct revmap_entry *rev; |
567 | unsigned long v, r, rb, mask, bits; | |
6f22bd32 | 568 | u64 pte; |
a8606e20 | 569 | |
32fad281 | 570 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 | 571 | return H_PARAMETER; |
697d3899 | 572 | |
6f22bd32 | 573 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 574 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 575 | cpu_relax(); |
6f22bd32 AG |
576 | pte = be64_to_cpu(hpte[0]); |
577 | if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || | |
578 | ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn)) { | |
a4bd6eb0 | 579 | __unlock_hpte(hpte, pte); |
a8606e20 PM |
580 | return H_NOT_FOUND; |
581 | } | |
697d3899 | 582 | |
6f22bd32 | 583 | v = pte; |
8936dda4 PM |
584 | bits = (flags << 55) & HPTE_R_PP0; |
585 | bits |= (flags << 48) & HPTE_R_KEY_HI; | |
586 | bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); | |
587 | ||
588 | /* Update guest view of 2nd HPTE dword */ | |
589 | mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | | |
590 | HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
591 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
592 | if (rev) { | |
593 | r = (rev->guest_rpte & ~mask) | bits; | |
594 | rev->guest_rpte = r; | |
44e5f6be | 595 | note_hpte_modification(kvm, rev); |
8936dda4 | 596 | } |
8936dda4 PM |
597 | |
598 | /* Update HPTE */ | |
697d3899 | 599 | if (v & HPTE_V_VALID) { |
1cc8ed0b | 600 | /* |
b4a83900 PM |
601 | * If the page is valid, don't let it transition from |
602 | * readonly to writable. If it should be writable, we'll | |
603 | * take a trap and let the page fault code sort it out. | |
1cc8ed0b | 604 | */ |
b4a83900 PM |
605 | pte = be64_to_cpu(hpte[1]); |
606 | r = (pte & ~mask) | bits; | |
c17b98cf | 607 | if (hpte_is_writable(r) && !hpte_is_writable(pte)) |
b4a83900 PM |
608 | r = hpte_make_readonly(r); |
609 | /* If the PTE is changing, invalidate it first */ | |
610 | if (r != pte) { | |
611 | rb = compute_tlbie_rb(v, r, pte_index); | |
612 | hpte[0] = cpu_to_be64((v & ~HPTE_V_VALID) | | |
613 | HPTE_V_ABSENT); | |
614 | do_tlbies(kvm, &rb, 1, global_invalidates(kvm, flags), | |
615 | true); | |
616 | hpte[1] = cpu_to_be64(r); | |
1cc8ed0b | 617 | } |
a8606e20 | 618 | } |
b4a83900 | 619 | unlock_hpte(hpte, v & ~HPTE_V_HVLOCK); |
a8606e20 PM |
620 | asm volatile("ptesync" : : : "memory"); |
621 | return H_SUCCESS; | |
622 | } | |
623 | ||
a8606e20 PM |
624 | long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, |
625 | unsigned long pte_index) | |
626 | { | |
627 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 AG |
628 | __be64 *hpte; |
629 | unsigned long v, r; | |
a8606e20 | 630 | int i, n = 1; |
8936dda4 | 631 | struct revmap_entry *rev = NULL; |
a8606e20 | 632 | |
32fad281 | 633 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
634 | return H_PARAMETER; |
635 | if (flags & H_READ_4) { | |
636 | pte_index &= ~3; | |
637 | n = 4; | |
638 | } | |
bad3b507 | 639 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
a8606e20 | 640 | for (i = 0; i < n; ++i, ++pte_index) { |
6f22bd32 AG |
641 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
642 | v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK; | |
643 | r = be64_to_cpu(hpte[1]); | |
697d3899 PM |
644 | if (v & HPTE_V_ABSENT) { |
645 | v &= ~HPTE_V_ABSENT; | |
646 | v |= HPTE_V_VALID; | |
647 | } | |
44e5f6be | 648 | if (v & HPTE_V_VALID) { |
bad3b507 | 649 | r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C)); |
44e5f6be PM |
650 | r &= ~HPTE_GR_RESERVED; |
651 | } | |
697d3899 | 652 | vcpu->arch.gpr[4 + i * 2] = v; |
a8606e20 PM |
653 | vcpu->arch.gpr[5 + i * 2] = r; |
654 | } | |
655 | return H_SUCCESS; | |
656 | } | |
697d3899 | 657 | |
6f22bd32 | 658 | void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep, |
342d3db7 PM |
659 | unsigned long pte_index) |
660 | { | |
661 | unsigned long rb; | |
662 | ||
6f22bd32 AG |
663 | hptep[0] &= ~cpu_to_be64(HPTE_V_VALID); |
664 | rb = compute_tlbie_rb(be64_to_cpu(hptep[0]), be64_to_cpu(hptep[1]), | |
665 | pte_index); | |
54480501 | 666 | do_tlbies(kvm, &rb, 1, 1, true); |
342d3db7 PM |
667 | } |
668 | EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); | |
669 | ||
6f22bd32 | 670 | void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep, |
55514893 PM |
671 | unsigned long pte_index) |
672 | { | |
673 | unsigned long rb; | |
674 | unsigned char rbyte; | |
675 | ||
6f22bd32 AG |
676 | rb = compute_tlbie_rb(be64_to_cpu(hptep[0]), be64_to_cpu(hptep[1]), |
677 | pte_index); | |
678 | rbyte = (be64_to_cpu(hptep[1]) & ~HPTE_R_R) >> 8; | |
55514893 PM |
679 | /* modify only the second-last byte, which contains the ref bit */ |
680 | *((char *)hptep + 14) = rbyte; | |
54480501 | 681 | do_tlbies(kvm, &rb, 1, 1, false); |
55514893 PM |
682 | } |
683 | EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); | |
684 | ||
697d3899 PM |
685 | static int slb_base_page_shift[4] = { |
686 | 24, /* 16M */ | |
687 | 16, /* 64k */ | |
688 | 34, /* 16G */ | |
689 | 20, /* 1M, unsupported */ | |
690 | }; | |
691 | ||
91648ec0 | 692 | /* When called from virtmode, this func should be protected by |
693 | * preempt_disable(), otherwise, the holding of HPTE_V_HVLOCK | |
694 | * can trigger deadlock issue. | |
695 | */ | |
697d3899 PM |
696 | long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, |
697 | unsigned long valid) | |
698 | { | |
699 | unsigned int i; | |
700 | unsigned int pshift; | |
701 | unsigned long somask; | |
702 | unsigned long vsid, hash; | |
703 | unsigned long avpn; | |
6f22bd32 | 704 | __be64 *hpte; |
697d3899 PM |
705 | unsigned long mask, val; |
706 | unsigned long v, r; | |
707 | ||
708 | /* Get page shift, work out hash and AVPN etc. */ | |
709 | mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; | |
710 | val = 0; | |
711 | pshift = 12; | |
712 | if (slb_v & SLB_VSID_L) { | |
713 | mask |= HPTE_V_LARGE; | |
714 | val |= HPTE_V_LARGE; | |
715 | pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; | |
716 | } | |
717 | if (slb_v & SLB_VSID_B_1T) { | |
718 | somask = (1UL << 40) - 1; | |
719 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; | |
720 | vsid ^= vsid << 25; | |
721 | } else { | |
722 | somask = (1UL << 28) - 1; | |
723 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; | |
724 | } | |
32fad281 | 725 | hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvm->arch.hpt_mask; |
697d3899 PM |
726 | avpn = slb_v & ~(somask >> 16); /* also includes B */ |
727 | avpn |= (eaddr & somask) >> 16; | |
728 | ||
729 | if (pshift >= 24) | |
730 | avpn &= ~((1UL << (pshift - 16)) - 1); | |
731 | else | |
732 | avpn &= ~0x7fUL; | |
733 | val |= avpn; | |
734 | ||
735 | for (;;) { | |
6f22bd32 | 736 | hpte = (__be64 *)(kvm->arch.hpt_virt + (hash << 7)); |
697d3899 PM |
737 | |
738 | for (i = 0; i < 16; i += 2) { | |
739 | /* Read the PTE racily */ | |
6f22bd32 | 740 | v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK; |
697d3899 PM |
741 | |
742 | /* Check valid/absent, hash, segment size and AVPN */ | |
743 | if (!(v & valid) || (v & mask) != val) | |
744 | continue; | |
745 | ||
746 | /* Lock the PTE and read it under the lock */ | |
747 | while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) | |
748 | cpu_relax(); | |
6f22bd32 AG |
749 | v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK; |
750 | r = be64_to_cpu(hpte[i+1]); | |
697d3899 PM |
751 | |
752 | /* | |
341acbb3 | 753 | * Check the HPTE again, including base page size |
697d3899 PM |
754 | */ |
755 | if ((v & valid) && (v & mask) == val && | |
341acbb3 | 756 | hpte_base_page_size(v, r) == (1ul << pshift)) |
697d3899 PM |
757 | /* Return with the HPTE still locked */ |
758 | return (hash << 3) + (i >> 1); | |
759 | ||
a4bd6eb0 | 760 | __unlock_hpte(&hpte[i], v); |
697d3899 PM |
761 | } |
762 | ||
763 | if (val & HPTE_V_SECONDARY) | |
764 | break; | |
765 | val |= HPTE_V_SECONDARY; | |
32fad281 | 766 | hash = hash ^ kvm->arch.hpt_mask; |
697d3899 PM |
767 | } |
768 | return -1; | |
769 | } | |
770 | EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); | |
771 | ||
772 | /* | |
773 | * Called in real mode to check whether an HPTE not found fault | |
4cf302bc PM |
774 | * is due to accessing a paged-out page or an emulated MMIO page, |
775 | * or if a protection fault is due to accessing a page that the | |
776 | * guest wanted read/write access to but which we made read-only. | |
697d3899 PM |
777 | * Returns a possibly modified status (DSISR) value if not |
778 | * (i.e. pass the interrupt to the guest), | |
779 | * -1 to pass the fault up to host kernel mode code, -2 to do that | |
342d3db7 | 780 | * and also load the instruction word (for MMIO emulation), |
697d3899 PM |
781 | * or 0 if we should make the guest retry the access. |
782 | */ | |
783 | long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, | |
342d3db7 | 784 | unsigned long slb_v, unsigned int status, bool data) |
697d3899 PM |
785 | { |
786 | struct kvm *kvm = vcpu->kvm; | |
787 | long int index; | |
788 | unsigned long v, r, gr; | |
6f22bd32 | 789 | __be64 *hpte; |
697d3899 PM |
790 | unsigned long valid; |
791 | struct revmap_entry *rev; | |
792 | unsigned long pp, key; | |
793 | ||
4cf302bc PM |
794 | /* For protection fault, expect to find a valid HPTE */ |
795 | valid = HPTE_V_VALID; | |
796 | if (status & DSISR_NOHPTE) | |
797 | valid |= HPTE_V_ABSENT; | |
342d3db7 | 798 | |
697d3899 | 799 | index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); |
4cf302bc PM |
800 | if (index < 0) { |
801 | if (status & DSISR_NOHPTE) | |
802 | return status; /* there really was no HPTE */ | |
803 | return 0; /* for prot fault, HPTE disappeared */ | |
804 | } | |
6f22bd32 AG |
805 | hpte = (__be64 *)(kvm->arch.hpt_virt + (index << 4)); |
806 | v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK; | |
807 | r = be64_to_cpu(hpte[1]); | |
697d3899 PM |
808 | rev = real_vmalloc_addr(&kvm->arch.revmap[index]); |
809 | gr = rev->guest_rpte; | |
810 | ||
a92bce95 | 811 | unlock_hpte(hpte, v); |
697d3899 | 812 | |
4cf302bc PM |
813 | /* For not found, if the HPTE is valid by now, retry the instruction */ |
814 | if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) | |
697d3899 PM |
815 | return 0; |
816 | ||
817 | /* Check access permissions to the page */ | |
818 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
819 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
342d3db7 PM |
820 | status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */ |
821 | if (!data) { | |
822 | if (gr & (HPTE_R_N | HPTE_R_G)) | |
823 | return status | SRR1_ISI_N_OR_G; | |
824 | if (!hpte_read_permission(pp, slb_v & key)) | |
825 | return status | SRR1_ISI_PROT; | |
826 | } else if (status & DSISR_ISSTORE) { | |
697d3899 PM |
827 | /* check write permission */ |
828 | if (!hpte_write_permission(pp, slb_v & key)) | |
342d3db7 | 829 | return status | DSISR_PROTFAULT; |
697d3899 PM |
830 | } else { |
831 | if (!hpte_read_permission(pp, slb_v & key)) | |
342d3db7 | 832 | return status | DSISR_PROTFAULT; |
697d3899 PM |
833 | } |
834 | ||
835 | /* Check storage key, if applicable */ | |
342d3db7 | 836 | if (data && (vcpu->arch.shregs.msr & MSR_DR)) { |
697d3899 PM |
837 | unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); |
838 | if (status & DSISR_ISSTORE) | |
839 | perm >>= 1; | |
840 | if (perm & 1) | |
342d3db7 | 841 | return status | DSISR_KEYFAULT; |
697d3899 PM |
842 | } |
843 | ||
844 | /* Save HPTE info for virtual-mode handler */ | |
845 | vcpu->arch.pgfault_addr = addr; | |
846 | vcpu->arch.pgfault_index = index; | |
847 | vcpu->arch.pgfault_hpte[0] = v; | |
848 | vcpu->arch.pgfault_hpte[1] = r; | |
849 | ||
342d3db7 PM |
850 | /* Check the storage key to see if it is possibly emulated MMIO */ |
851 | if (data && (vcpu->arch.shregs.msr & MSR_IR) && | |
852 | (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) == | |
853 | (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) | |
697d3899 PM |
854 | return -2; /* MMIO emulation - load instr word */ |
855 | ||
856 | return -1; /* send fault up to host kernel mode */ | |
697d3899 | 857 | } |