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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; | |
29 | ||
12bc9f6f | 30 | p = find_linux_pte_or_hugepte(swapper_pg_dir, addr, NULL); |
8936dda4 PM |
31 | if (!p || !pte_present(*p)) |
32 | return NULL; | |
33 | /* assume we don't have huge pages in vmalloc space... */ | |
34 | addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); | |
35 | return __va(addr); | |
36 | } | |
a8606e20 | 37 | |
1b400ba0 PM |
38 | /* Return 1 if we need to do a global tlbie, 0 if we can use tlbiel */ |
39 | static int global_invalidates(struct kvm *kvm, unsigned long flags) | |
40 | { | |
41 | int global; | |
42 | ||
43 | /* | |
44 | * If there is only one vcore, and it's currently running, | |
45 | * we can use tlbiel as long as we mark all other physical | |
46 | * cores as potentially having stale TLB entries for this lpid. | |
47 | * If we're not using MMU notifiers, we never take pages away | |
48 | * from the guest, so we can use tlbiel if requested. | |
49 | * Otherwise, don't use tlbiel. | |
50 | */ | |
51 | if (kvm->arch.online_vcores == 1 && local_paca->kvm_hstate.kvm_vcore) | |
52 | global = 0; | |
53 | else if (kvm->arch.using_mmu_notifiers) | |
54 | global = 1; | |
55 | else | |
56 | global = !(flags & H_LOCAL); | |
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)); |
9d4cba7f | 114 | memslot = __gfn_to_memslot(kvm_memslots(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 | 137 | static pte_t lookup_linux_pte(pgd_t *pgdir, unsigned long hva, |
4cf302bc | 138 | int writing, unsigned long *pte_sizep) |
342d3db7 PM |
139 | { |
140 | pte_t *ptep; | |
141 | unsigned long ps = *pte_sizep; | |
db7cb5b9 | 142 | unsigned int hugepage_shift; |
342d3db7 | 143 | |
db7cb5b9 | 144 | ptep = find_linux_pte_or_hugepte(pgdir, hva, &hugepage_shift); |
342d3db7 PM |
145 | if (!ptep) |
146 | return __pte(0); | |
db7cb5b9 AK |
147 | if (hugepage_shift) |
148 | *pte_sizep = 1ul << hugepage_shift; | |
342d3db7 PM |
149 | else |
150 | *pte_sizep = PAGE_SIZE; | |
151 | if (ps > *pte_sizep) | |
152 | return __pte(0); | |
db7cb5b9 | 153 | return kvmppc_read_update_linux_pte(ptep, writing, hugepage_shift); |
342d3db7 PM |
154 | } |
155 | ||
a92bce95 PM |
156 | static inline void unlock_hpte(unsigned long *hpte, unsigned long hpte_v) |
157 | { | |
158 | asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); | |
159 | hpte[0] = hpte_v; | |
160 | } | |
161 | ||
7ed661bf PM |
162 | long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, |
163 | long pte_index, unsigned long pteh, unsigned long ptel, | |
164 | pgd_t *pgdir, bool realmode, unsigned long *pte_idx_ret) | |
a8606e20 | 165 | { |
c77162de | 166 | unsigned long i, pa, gpa, gfn, psize; |
342d3db7 | 167 | unsigned long slot_fn, hva; |
a8606e20 | 168 | unsigned long *hpte; |
8936dda4 | 169 | struct revmap_entry *rev; |
44e5f6be | 170 | unsigned long g_ptel; |
b2b2f165 | 171 | struct kvm_memory_slot *memslot; |
c77162de | 172 | unsigned long *physp, pte_size; |
9d0ef5ea | 173 | unsigned long is_io; |
06ce2c63 | 174 | unsigned long *rmap; |
342d3db7 | 175 | pte_t pte; |
4cf302bc | 176 | unsigned int writing; |
342d3db7 | 177 | unsigned long mmu_seq; |
bad3b507 | 178 | unsigned long rcbits; |
c77162de PM |
179 | |
180 | psize = hpte_page_size(pteh, ptel); | |
181 | if (!psize) | |
a8606e20 | 182 | return H_PARAMETER; |
4cf302bc | 183 | writing = hpte_is_writable(ptel); |
697d3899 | 184 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
44e5f6be PM |
185 | ptel &= ~HPTE_GR_RESERVED; |
186 | g_ptel = ptel; | |
b2b2f165 | 187 | |
342d3db7 PM |
188 | /* used later to detect if we might have been invalidated */ |
189 | mmu_seq = kvm->mmu_notifier_seq; | |
190 | smp_rmb(); | |
191 | ||
c77162de PM |
192 | /* Find the memslot (if any) for this address */ |
193 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); | |
194 | gfn = gpa >> PAGE_SHIFT; | |
9d4cba7f | 195 | memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); |
697d3899 | 196 | pa = 0; |
342d3db7 | 197 | is_io = ~0ul; |
697d3899 PM |
198 | rmap = NULL; |
199 | if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { | |
200 | /* PPC970 can't do emulated MMIO */ | |
201 | if (!cpu_has_feature(CPU_FTR_ARCH_206)) | |
202 | return H_PARAMETER; | |
203 | /* Emulated MMIO - mark this with key=31 */ | |
204 | pteh |= HPTE_V_ABSENT; | |
205 | ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
206 | goto do_insert; | |
207 | } | |
da9d1d7f PM |
208 | |
209 | /* Check if the requested page fits entirely in the memslot. */ | |
210 | if (!slot_is_aligned(memslot, psize)) | |
211 | return H_PARAMETER; | |
c77162de | 212 | slot_fn = gfn - memslot->base_gfn; |
d89cc617 | 213 | rmap = &memslot->arch.rmap[slot_fn]; |
c77162de | 214 | |
342d3db7 | 215 | if (!kvm->arch.using_mmu_notifiers) { |
a66b48c3 | 216 | physp = memslot->arch.slot_phys; |
342d3db7 PM |
217 | if (!physp) |
218 | return H_PARAMETER; | |
219 | physp += slot_fn; | |
220 | if (realmode) | |
221 | physp = real_vmalloc_addr(physp); | |
222 | pa = *physp; | |
223 | if (!pa) | |
224 | return H_TOO_HARD; | |
225 | is_io = pa & (HPTE_R_I | HPTE_R_W); | |
226 | pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); | |
227 | pa &= PAGE_MASK; | |
228 | } else { | |
229 | /* Translate to host virtual address */ | |
66a03505 | 230 | hva = __gfn_to_hva_memslot(memslot, gfn); |
342d3db7 PM |
231 | |
232 | /* Look up the Linux PTE for the backing page */ | |
233 | pte_size = psize; | |
7ed661bf | 234 | pte = lookup_linux_pte(pgdir, hva, writing, &pte_size); |
342d3db7 | 235 | if (pte_present(pte)) { |
4cf302bc PM |
236 | if (writing && !pte_write(pte)) |
237 | /* make the actual HPTE be read-only */ | |
238 | ptel = hpte_make_readonly(ptel); | |
342d3db7 PM |
239 | is_io = hpte_cache_bits(pte_val(pte)); |
240 | pa = pte_pfn(pte) << PAGE_SHIFT; | |
241 | } | |
242 | } | |
7ed661bf | 243 | |
c77162de PM |
244 | if (pte_size < psize) |
245 | return H_PARAMETER; | |
246 | if (pa && pte_size > psize) | |
247 | pa |= gpa & (pte_size - 1); | |
248 | ||
249 | ptel &= ~(HPTE_R_PP0 - psize); | |
250 | ptel |= pa; | |
342d3db7 PM |
251 | |
252 | if (pa) | |
253 | pteh |= HPTE_V_VALID; | |
254 | else | |
255 | pteh |= HPTE_V_ABSENT; | |
c77162de | 256 | |
a8606e20 | 257 | /* Check WIMG */ |
342d3db7 | 258 | if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) { |
9d0ef5ea PM |
259 | if (is_io) |
260 | return H_PARAMETER; | |
261 | /* | |
262 | * Allow guest to map emulated device memory as | |
263 | * uncacheable, but actually make it cacheable. | |
264 | */ | |
265 | ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); | |
266 | ptel |= HPTE_R_M; | |
267 | } | |
075295dd | 268 | |
342d3db7 | 269 | /* Find and lock the HPTEG slot to use */ |
697d3899 | 270 | do_insert: |
32fad281 | 271 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
272 | return H_PARAMETER; |
273 | if (likely((flags & H_EXACT) == 0)) { | |
274 | pte_index &= ~7UL; | |
275 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); | |
075295dd | 276 | for (i = 0; i < 8; ++i) { |
a8606e20 | 277 | if ((*hpte & HPTE_V_VALID) == 0 && |
697d3899 PM |
278 | try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
279 | HPTE_V_ABSENT)) | |
a8606e20 PM |
280 | break; |
281 | hpte += 2; | |
282 | } | |
075295dd PM |
283 | if (i == 8) { |
284 | /* | |
285 | * Since try_lock_hpte doesn't retry (not even stdcx. | |
286 | * failures), it could be that there is a free slot | |
287 | * but we transiently failed to lock it. Try again, | |
288 | * actually locking each slot and checking it. | |
289 | */ | |
290 | hpte -= 16; | |
291 | for (i = 0; i < 8; ++i) { | |
292 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) | |
293 | cpu_relax(); | |
697d3899 | 294 | if (!(*hpte & (HPTE_V_VALID | HPTE_V_ABSENT))) |
075295dd PM |
295 | break; |
296 | *hpte &= ~HPTE_V_HVLOCK; | |
297 | hpte += 2; | |
298 | } | |
299 | if (i == 8) | |
300 | return H_PTEG_FULL; | |
301 | } | |
8936dda4 | 302 | pte_index += i; |
a8606e20 | 303 | } else { |
a8606e20 | 304 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
697d3899 PM |
305 | if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
306 | HPTE_V_ABSENT)) { | |
075295dd PM |
307 | /* Lock the slot and check again */ |
308 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) | |
309 | cpu_relax(); | |
697d3899 | 310 | if (*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
075295dd PM |
311 | *hpte &= ~HPTE_V_HVLOCK; |
312 | return H_PTEG_FULL; | |
313 | } | |
314 | } | |
a8606e20 | 315 | } |
8936dda4 PM |
316 | |
317 | /* Save away the guest's idea of the second HPTE dword */ | |
06ce2c63 PM |
318 | rev = &kvm->arch.revmap[pte_index]; |
319 | if (realmode) | |
320 | rev = real_vmalloc_addr(rev); | |
44e5f6be | 321 | if (rev) { |
8936dda4 | 322 | rev->guest_rpte = g_ptel; |
44e5f6be PM |
323 | note_hpte_modification(kvm, rev); |
324 | } | |
06ce2c63 PM |
325 | |
326 | /* Link HPTE into reverse-map chain */ | |
697d3899 PM |
327 | if (pteh & HPTE_V_VALID) { |
328 | if (realmode) | |
329 | rmap = real_vmalloc_addr(rmap); | |
330 | lock_rmap(rmap); | |
342d3db7 PM |
331 | /* Check for pending invalidations under the rmap chain lock */ |
332 | if (kvm->arch.using_mmu_notifiers && | |
7ed661bf | 333 | mmu_notifier_retry(kvm, mmu_seq)) { |
342d3db7 PM |
334 | /* inval in progress, write a non-present HPTE */ |
335 | pteh |= HPTE_V_ABSENT; | |
336 | pteh &= ~HPTE_V_VALID; | |
337 | unlock_rmap(rmap); | |
338 | } else { | |
339 | kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, | |
340 | realmode); | |
bad3b507 PM |
341 | /* Only set R/C in real HPTE if already set in *rmap */ |
342 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
343 | ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
342d3db7 | 344 | } |
697d3899 | 345 | } |
06ce2c63 | 346 | |
a8606e20 | 347 | hpte[1] = ptel; |
06ce2c63 PM |
348 | |
349 | /* Write the first HPTE dword, unlocking the HPTE and making it valid */ | |
a8606e20 PM |
350 | eieio(); |
351 | hpte[0] = pteh; | |
352 | asm volatile("ptesync" : : : "memory"); | |
06ce2c63 | 353 | |
7ed661bf | 354 | *pte_idx_ret = pte_index; |
a8606e20 PM |
355 | return H_SUCCESS; |
356 | } | |
7ed661bf PM |
357 | EXPORT_SYMBOL_GPL(kvmppc_do_h_enter); |
358 | ||
359 | long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, | |
360 | long pte_index, unsigned long pteh, unsigned long ptel) | |
361 | { | |
362 | return kvmppc_do_h_enter(vcpu->kvm, flags, pte_index, pteh, ptel, | |
363 | vcpu->arch.pgdir, true, &vcpu->arch.gpr[4]); | |
364 | } | |
a8606e20 | 365 | |
a8606e20 PM |
366 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) |
367 | ||
368 | static inline int try_lock_tlbie(unsigned int *lock) | |
369 | { | |
370 | unsigned int tmp, old; | |
371 | unsigned int token = LOCK_TOKEN; | |
372 | ||
373 | asm volatile("1:lwarx %1,0,%2\n" | |
374 | " cmpwi cr0,%1,0\n" | |
375 | " bne 2f\n" | |
376 | " stwcx. %3,0,%2\n" | |
377 | " bne- 1b\n" | |
378 | " isync\n" | |
379 | "2:" | |
380 | : "=&r" (tmp), "=&r" (old) | |
381 | : "r" (lock), "r" (token) | |
382 | : "cc", "memory"); | |
383 | return old == 0; | |
384 | } | |
385 | ||
6b445ad4 PM |
386 | long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags, |
387 | unsigned long pte_index, unsigned long avpn, | |
388 | unsigned long *hpret) | |
a8606e20 | 389 | { |
a8606e20 PM |
390 | unsigned long *hpte; |
391 | unsigned long v, r, rb; | |
a92bce95 | 392 | struct revmap_entry *rev; |
a8606e20 | 393 | |
32fad281 | 394 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
395 | return H_PARAMETER; |
396 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); | |
075295dd | 397 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 398 | cpu_relax(); |
697d3899 | 399 | if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || |
a8606e20 PM |
400 | ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) || |
401 | ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) { | |
402 | hpte[0] &= ~HPTE_V_HVLOCK; | |
403 | return H_NOT_FOUND; | |
404 | } | |
a92bce95 PM |
405 | |
406 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
407 | v = hpte[0] & ~HPTE_V_HVLOCK; | |
408 | if (v & HPTE_V_VALID) { | |
409 | hpte[0] &= ~HPTE_V_VALID; | |
410 | rb = compute_tlbie_rb(v, hpte[1], pte_index); | |
1b400ba0 | 411 | if (global_invalidates(kvm, flags)) { |
a92bce95 PM |
412 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) |
413 | cpu_relax(); | |
414 | asm volatile("ptesync" : : : "memory"); | |
415 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" | |
416 | : : "r" (rb), "r" (kvm->arch.lpid)); | |
417 | asm volatile("ptesync" : : : "memory"); | |
418 | kvm->arch.tlbie_lock = 0; | |
419 | } else { | |
420 | asm volatile("ptesync" : : : "memory"); | |
421 | asm volatile("tlbiel %0" : : "r" (rb)); | |
422 | asm volatile("ptesync" : : : "memory"); | |
423 | } | |
bad3b507 PM |
424 | /* Read PTE low word after tlbie to get final R/C values */ |
425 | remove_revmap_chain(kvm, pte_index, rev, v, hpte[1]); | |
a8606e20 | 426 | } |
44e5f6be PM |
427 | r = rev->guest_rpte & ~HPTE_GR_RESERVED; |
428 | note_hpte_modification(kvm, rev); | |
a92bce95 PM |
429 | unlock_hpte(hpte, 0); |
430 | ||
6b445ad4 PM |
431 | hpret[0] = v; |
432 | hpret[1] = r; | |
a8606e20 PM |
433 | return H_SUCCESS; |
434 | } | |
6b445ad4 PM |
435 | EXPORT_SYMBOL_GPL(kvmppc_do_h_remove); |
436 | ||
437 | long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, | |
438 | unsigned long pte_index, unsigned long avpn) | |
439 | { | |
440 | return kvmppc_do_h_remove(vcpu->kvm, flags, pte_index, avpn, | |
441 | &vcpu->arch.gpr[4]); | |
442 | } | |
a8606e20 PM |
443 | |
444 | long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) | |
445 | { | |
446 | struct kvm *kvm = vcpu->kvm; | |
447 | unsigned long *args = &vcpu->arch.gpr[4]; | |
a92bce95 PM |
448 | unsigned long *hp, *hptes[4], tlbrb[4]; |
449 | long int i, j, k, n, found, indexes[4]; | |
450 | unsigned long flags, req, pte_index, rcbits; | |
a8606e20 PM |
451 | long int local = 0; |
452 | long int ret = H_SUCCESS; | |
a92bce95 | 453 | struct revmap_entry *rev, *revs[4]; |
a8606e20 PM |
454 | |
455 | if (atomic_read(&kvm->online_vcpus) == 1) | |
456 | local = 1; | |
a92bce95 PM |
457 | for (i = 0; i < 4 && ret == H_SUCCESS; ) { |
458 | n = 0; | |
459 | for (; i < 4; ++i) { | |
460 | j = i * 2; | |
461 | pte_index = args[j]; | |
462 | flags = pte_index >> 56; | |
463 | pte_index &= ((1ul << 56) - 1); | |
464 | req = flags >> 6; | |
465 | flags &= 3; | |
466 | if (req == 3) { /* no more requests */ | |
467 | i = 4; | |
a8606e20 | 468 | break; |
a92bce95 | 469 | } |
32fad281 PM |
470 | if (req != 1 || flags == 3 || |
471 | pte_index >= kvm->arch.hpt_npte) { | |
a92bce95 PM |
472 | /* parameter error */ |
473 | args[j] = ((0xa0 | flags) << 56) + pte_index; | |
474 | ret = H_PARAMETER; | |
a8606e20 | 475 | break; |
a92bce95 PM |
476 | } |
477 | hp = (unsigned long *) | |
478 | (kvm->arch.hpt_virt + (pte_index << 4)); | |
479 | /* to avoid deadlock, don't spin except for first */ | |
480 | if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) { | |
481 | if (n) | |
482 | break; | |
483 | while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) | |
484 | cpu_relax(); | |
485 | } | |
486 | found = 0; | |
487 | if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { | |
488 | switch (flags & 3) { | |
489 | case 0: /* absolute */ | |
a8606e20 | 490 | found = 1; |
a92bce95 PM |
491 | break; |
492 | case 1: /* andcond */ | |
493 | if (!(hp[0] & args[j + 1])) | |
494 | found = 1; | |
495 | break; | |
496 | case 2: /* AVPN */ | |
497 | if ((hp[0] & ~0x7fUL) == args[j + 1]) | |
498 | found = 1; | |
499 | break; | |
500 | } | |
501 | } | |
502 | if (!found) { | |
503 | hp[0] &= ~HPTE_V_HVLOCK; | |
504 | args[j] = ((0x90 | flags) << 56) + pte_index; | |
505 | continue; | |
a8606e20 | 506 | } |
a92bce95 PM |
507 | |
508 | args[j] = ((0x80 | flags) << 56) + pte_index; | |
509 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
44e5f6be | 510 | note_hpte_modification(kvm, rev); |
a92bce95 | 511 | |
bad3b507 PM |
512 | if (!(hp[0] & HPTE_V_VALID)) { |
513 | /* insert R and C bits from PTE */ | |
514 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); | |
515 | args[j] |= rcbits << (56 - 5); | |
51bfd299 | 516 | hp[0] = 0; |
a92bce95 | 517 | continue; |
bad3b507 | 518 | } |
a92bce95 PM |
519 | |
520 | hp[0] &= ~HPTE_V_VALID; /* leave it locked */ | |
521 | tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index); | |
522 | indexes[n] = j; | |
523 | hptes[n] = hp; | |
524 | revs[n] = rev; | |
525 | ++n; | |
a8606e20 | 526 | } |
a92bce95 PM |
527 | |
528 | if (!n) | |
529 | break; | |
530 | ||
531 | /* Now that we've collected a batch, do the tlbies */ | |
532 | if (!local) { | |
533 | while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) | |
534 | cpu_relax(); | |
535 | asm volatile("ptesync" : : : "memory"); | |
536 | for (k = 0; k < n; ++k) | |
537 | asm volatile(PPC_TLBIE(%1,%0) : : | |
538 | "r" (tlbrb[k]), | |
539 | "r" (kvm->arch.lpid)); | |
540 | asm volatile("eieio; tlbsync; ptesync" : : : "memory"); | |
541 | kvm->arch.tlbie_lock = 0; | |
542 | } else { | |
543 | asm volatile("ptesync" : : : "memory"); | |
544 | for (k = 0; k < n; ++k) | |
545 | asm volatile("tlbiel %0" : : "r" (tlbrb[k])); | |
546 | asm volatile("ptesync" : : : "memory"); | |
a8606e20 | 547 | } |
a92bce95 | 548 | |
bad3b507 | 549 | /* Read PTE low words after tlbie to get final R/C values */ |
a92bce95 PM |
550 | for (k = 0; k < n; ++k) { |
551 | j = indexes[k]; | |
552 | pte_index = args[j] & ((1ul << 56) - 1); | |
553 | hp = hptes[k]; | |
554 | rev = revs[k]; | |
bad3b507 PM |
555 | remove_revmap_chain(kvm, pte_index, rev, hp[0], hp[1]); |
556 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); | |
557 | args[j] |= rcbits << (56 - 5); | |
558 | hp[0] = 0; | |
697d3899 | 559 | } |
a8606e20 | 560 | } |
a92bce95 | 561 | |
a8606e20 PM |
562 | return ret; |
563 | } | |
564 | ||
565 | long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, | |
566 | unsigned long pte_index, unsigned long avpn, | |
567 | unsigned long va) | |
568 | { | |
569 | struct kvm *kvm = vcpu->kvm; | |
570 | unsigned long *hpte; | |
8936dda4 PM |
571 | struct revmap_entry *rev; |
572 | unsigned long v, r, rb, mask, bits; | |
a8606e20 | 573 | |
32fad281 | 574 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 | 575 | return H_PARAMETER; |
697d3899 | 576 | |
a8606e20 | 577 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 578 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 579 | cpu_relax(); |
697d3899 | 580 | if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || |
a8606e20 PM |
581 | ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) { |
582 | hpte[0] &= ~HPTE_V_HVLOCK; | |
583 | return H_NOT_FOUND; | |
584 | } | |
697d3899 | 585 | |
a8606e20 | 586 | v = hpte[0]; |
8936dda4 PM |
587 | bits = (flags << 55) & HPTE_R_PP0; |
588 | bits |= (flags << 48) & HPTE_R_KEY_HI; | |
589 | bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); | |
590 | ||
591 | /* Update guest view of 2nd HPTE dword */ | |
592 | mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | | |
593 | HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
594 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
595 | if (rev) { | |
596 | r = (rev->guest_rpte & ~mask) | bits; | |
597 | rev->guest_rpte = r; | |
44e5f6be | 598 | note_hpte_modification(kvm, rev); |
8936dda4 PM |
599 | } |
600 | r = (hpte[1] & ~mask) | bits; | |
601 | ||
602 | /* Update HPTE */ | |
697d3899 PM |
603 | if (v & HPTE_V_VALID) { |
604 | rb = compute_tlbie_rb(v, r, pte_index); | |
605 | hpte[0] = v & ~HPTE_V_VALID; | |
1b400ba0 | 606 | if (global_invalidates(kvm, flags)) { |
697d3899 PM |
607 | while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) |
608 | cpu_relax(); | |
609 | asm volatile("ptesync" : : : "memory"); | |
610 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" | |
611 | : : "r" (rb), "r" (kvm->arch.lpid)); | |
612 | asm volatile("ptesync" : : : "memory"); | |
613 | kvm->arch.tlbie_lock = 0; | |
614 | } else { | |
615 | asm volatile("ptesync" : : : "memory"); | |
616 | asm volatile("tlbiel %0" : : "r" (rb)); | |
617 | asm volatile("ptesync" : : : "memory"); | |
618 | } | |
1cc8ed0b PM |
619 | /* |
620 | * If the host has this page as readonly but the guest | |
621 | * wants to make it read/write, reduce the permissions. | |
622 | * Checking the host permissions involves finding the | |
623 | * memslot and then the Linux PTE for the page. | |
624 | */ | |
625 | if (hpte_is_writable(r) && kvm->arch.using_mmu_notifiers) { | |
626 | unsigned long psize, gfn, hva; | |
627 | struct kvm_memory_slot *memslot; | |
628 | pgd_t *pgdir = vcpu->arch.pgdir; | |
629 | pte_t pte; | |
630 | ||
631 | psize = hpte_page_size(v, r); | |
632 | gfn = ((r & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; | |
633 | memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
634 | if (memslot) { | |
635 | hva = __gfn_to_hva_memslot(memslot, gfn); | |
636 | pte = lookup_linux_pte(pgdir, hva, 1, &psize); | |
637 | if (pte_present(pte) && !pte_write(pte)) | |
638 | r = hpte_make_readonly(r); | |
639 | } | |
640 | } | |
a8606e20 PM |
641 | } |
642 | hpte[1] = r; | |
643 | eieio(); | |
644 | hpte[0] = v & ~HPTE_V_HVLOCK; | |
645 | asm volatile("ptesync" : : : "memory"); | |
646 | return H_SUCCESS; | |
647 | } | |
648 | ||
a8606e20 PM |
649 | long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, |
650 | unsigned long pte_index) | |
651 | { | |
652 | struct kvm *kvm = vcpu->kvm; | |
697d3899 | 653 | unsigned long *hpte, v, r; |
a8606e20 | 654 | int i, n = 1; |
8936dda4 | 655 | struct revmap_entry *rev = NULL; |
a8606e20 | 656 | |
32fad281 | 657 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
658 | return H_PARAMETER; |
659 | if (flags & H_READ_4) { | |
660 | pte_index &= ~3; | |
661 | n = 4; | |
662 | } | |
bad3b507 | 663 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
a8606e20 PM |
664 | for (i = 0; i < n; ++i, ++pte_index) { |
665 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); | |
697d3899 | 666 | v = hpte[0] & ~HPTE_V_HVLOCK; |
a8606e20 | 667 | r = hpte[1]; |
697d3899 PM |
668 | if (v & HPTE_V_ABSENT) { |
669 | v &= ~HPTE_V_ABSENT; | |
670 | v |= HPTE_V_VALID; | |
671 | } | |
44e5f6be | 672 | if (v & HPTE_V_VALID) { |
bad3b507 | 673 | r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C)); |
44e5f6be PM |
674 | r &= ~HPTE_GR_RESERVED; |
675 | } | |
697d3899 | 676 | vcpu->arch.gpr[4 + i * 2] = v; |
a8606e20 PM |
677 | vcpu->arch.gpr[5 + i * 2] = r; |
678 | } | |
679 | return H_SUCCESS; | |
680 | } | |
697d3899 | 681 | |
342d3db7 PM |
682 | void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, |
683 | unsigned long pte_index) | |
684 | { | |
685 | unsigned long rb; | |
686 | ||
687 | hptep[0] &= ~HPTE_V_VALID; | |
688 | rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); | |
689 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) | |
690 | cpu_relax(); | |
691 | asm volatile("ptesync" : : : "memory"); | |
692 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" | |
693 | : : "r" (rb), "r" (kvm->arch.lpid)); | |
694 | asm volatile("ptesync" : : : "memory"); | |
695 | kvm->arch.tlbie_lock = 0; | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); | |
698 | ||
55514893 PM |
699 | void kvmppc_clear_ref_hpte(struct kvm *kvm, unsigned long *hptep, |
700 | unsigned long pte_index) | |
701 | { | |
702 | unsigned long rb; | |
703 | unsigned char rbyte; | |
704 | ||
705 | rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); | |
706 | rbyte = (hptep[1] & ~HPTE_R_R) >> 8; | |
707 | /* modify only the second-last byte, which contains the ref bit */ | |
708 | *((char *)hptep + 14) = rbyte; | |
709 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) | |
710 | cpu_relax(); | |
711 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" | |
712 | : : "r" (rb), "r" (kvm->arch.lpid)); | |
713 | asm volatile("ptesync" : : : "memory"); | |
714 | kvm->arch.tlbie_lock = 0; | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); | |
717 | ||
697d3899 PM |
718 | static int slb_base_page_shift[4] = { |
719 | 24, /* 16M */ | |
720 | 16, /* 64k */ | |
721 | 34, /* 16G */ | |
722 | 20, /* 1M, unsupported */ | |
723 | }; | |
724 | ||
725 | long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, | |
726 | unsigned long valid) | |
727 | { | |
728 | unsigned int i; | |
729 | unsigned int pshift; | |
730 | unsigned long somask; | |
731 | unsigned long vsid, hash; | |
732 | unsigned long avpn; | |
733 | unsigned long *hpte; | |
734 | unsigned long mask, val; | |
735 | unsigned long v, r; | |
736 | ||
737 | /* Get page shift, work out hash and AVPN etc. */ | |
738 | mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; | |
739 | val = 0; | |
740 | pshift = 12; | |
741 | if (slb_v & SLB_VSID_L) { | |
742 | mask |= HPTE_V_LARGE; | |
743 | val |= HPTE_V_LARGE; | |
744 | pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; | |
745 | } | |
746 | if (slb_v & SLB_VSID_B_1T) { | |
747 | somask = (1UL << 40) - 1; | |
748 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; | |
749 | vsid ^= vsid << 25; | |
750 | } else { | |
751 | somask = (1UL << 28) - 1; | |
752 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; | |
753 | } | |
32fad281 | 754 | hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvm->arch.hpt_mask; |
697d3899 PM |
755 | avpn = slb_v & ~(somask >> 16); /* also includes B */ |
756 | avpn |= (eaddr & somask) >> 16; | |
757 | ||
758 | if (pshift >= 24) | |
759 | avpn &= ~((1UL << (pshift - 16)) - 1); | |
760 | else | |
761 | avpn &= ~0x7fUL; | |
762 | val |= avpn; | |
763 | ||
764 | for (;;) { | |
765 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (hash << 7)); | |
766 | ||
767 | for (i = 0; i < 16; i += 2) { | |
768 | /* Read the PTE racily */ | |
769 | v = hpte[i] & ~HPTE_V_HVLOCK; | |
770 | ||
771 | /* Check valid/absent, hash, segment size and AVPN */ | |
772 | if (!(v & valid) || (v & mask) != val) | |
773 | continue; | |
774 | ||
775 | /* Lock the PTE and read it under the lock */ | |
776 | while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) | |
777 | cpu_relax(); | |
778 | v = hpte[i] & ~HPTE_V_HVLOCK; | |
779 | r = hpte[i+1]; | |
780 | ||
781 | /* | |
782 | * Check the HPTE again, including large page size | |
783 | * Since we don't currently allow any MPSS (mixed | |
784 | * page-size segment) page sizes, it is sufficient | |
785 | * to check against the actual page size. | |
786 | */ | |
787 | if ((v & valid) && (v & mask) == val && | |
788 | hpte_page_size(v, r) == (1ul << pshift)) | |
789 | /* Return with the HPTE still locked */ | |
790 | return (hash << 3) + (i >> 1); | |
791 | ||
792 | /* Unlock and move on */ | |
793 | hpte[i] = v; | |
794 | } | |
795 | ||
796 | if (val & HPTE_V_SECONDARY) | |
797 | break; | |
798 | val |= HPTE_V_SECONDARY; | |
32fad281 | 799 | hash = hash ^ kvm->arch.hpt_mask; |
697d3899 PM |
800 | } |
801 | return -1; | |
802 | } | |
803 | EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); | |
804 | ||
805 | /* | |
806 | * Called in real mode to check whether an HPTE not found fault | |
4cf302bc PM |
807 | * is due to accessing a paged-out page or an emulated MMIO page, |
808 | * or if a protection fault is due to accessing a page that the | |
809 | * guest wanted read/write access to but which we made read-only. | |
697d3899 PM |
810 | * Returns a possibly modified status (DSISR) value if not |
811 | * (i.e. pass the interrupt to the guest), | |
812 | * -1 to pass the fault up to host kernel mode code, -2 to do that | |
342d3db7 | 813 | * and also load the instruction word (for MMIO emulation), |
697d3899 PM |
814 | * or 0 if we should make the guest retry the access. |
815 | */ | |
816 | long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, | |
342d3db7 | 817 | unsigned long slb_v, unsigned int status, bool data) |
697d3899 PM |
818 | { |
819 | struct kvm *kvm = vcpu->kvm; | |
820 | long int index; | |
821 | unsigned long v, r, gr; | |
822 | unsigned long *hpte; | |
823 | unsigned long valid; | |
824 | struct revmap_entry *rev; | |
825 | unsigned long pp, key; | |
826 | ||
4cf302bc PM |
827 | /* For protection fault, expect to find a valid HPTE */ |
828 | valid = HPTE_V_VALID; | |
829 | if (status & DSISR_NOHPTE) | |
830 | valid |= HPTE_V_ABSENT; | |
342d3db7 | 831 | |
697d3899 | 832 | index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); |
4cf302bc PM |
833 | if (index < 0) { |
834 | if (status & DSISR_NOHPTE) | |
835 | return status; /* there really was no HPTE */ | |
836 | return 0; /* for prot fault, HPTE disappeared */ | |
837 | } | |
697d3899 PM |
838 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); |
839 | v = hpte[0] & ~HPTE_V_HVLOCK; | |
840 | r = hpte[1]; | |
841 | rev = real_vmalloc_addr(&kvm->arch.revmap[index]); | |
842 | gr = rev->guest_rpte; | |
843 | ||
a92bce95 | 844 | unlock_hpte(hpte, v); |
697d3899 | 845 | |
4cf302bc PM |
846 | /* For not found, if the HPTE is valid by now, retry the instruction */ |
847 | if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) | |
697d3899 PM |
848 | return 0; |
849 | ||
850 | /* Check access permissions to the page */ | |
851 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
852 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
342d3db7 PM |
853 | status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */ |
854 | if (!data) { | |
855 | if (gr & (HPTE_R_N | HPTE_R_G)) | |
856 | return status | SRR1_ISI_N_OR_G; | |
857 | if (!hpte_read_permission(pp, slb_v & key)) | |
858 | return status | SRR1_ISI_PROT; | |
859 | } else if (status & DSISR_ISSTORE) { | |
697d3899 PM |
860 | /* check write permission */ |
861 | if (!hpte_write_permission(pp, slb_v & key)) | |
342d3db7 | 862 | return status | DSISR_PROTFAULT; |
697d3899 PM |
863 | } else { |
864 | if (!hpte_read_permission(pp, slb_v & key)) | |
342d3db7 | 865 | return status | DSISR_PROTFAULT; |
697d3899 PM |
866 | } |
867 | ||
868 | /* Check storage key, if applicable */ | |
342d3db7 | 869 | if (data && (vcpu->arch.shregs.msr & MSR_DR)) { |
697d3899 PM |
870 | unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); |
871 | if (status & DSISR_ISSTORE) | |
872 | perm >>= 1; | |
873 | if (perm & 1) | |
342d3db7 | 874 | return status | DSISR_KEYFAULT; |
697d3899 PM |
875 | } |
876 | ||
877 | /* Save HPTE info for virtual-mode handler */ | |
878 | vcpu->arch.pgfault_addr = addr; | |
879 | vcpu->arch.pgfault_index = index; | |
880 | vcpu->arch.pgfault_hpte[0] = v; | |
881 | vcpu->arch.pgfault_hpte[1] = r; | |
882 | ||
342d3db7 PM |
883 | /* Check the storage key to see if it is possibly emulated MMIO */ |
884 | if (data && (vcpu->arch.shregs.msr & MSR_IR) && | |
885 | (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) == | |
886 | (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) | |
697d3899 PM |
887 | return -2; /* MMIO emulation - load instr word */ |
888 | ||
889 | return -1; /* send fault up to host kernel mode */ | |
697d3899 | 890 | } |