Commit | Line | Data |
---|---|---|
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, | |
55765483 | 45 | * as indicated by local_paca->kvm_hstate.kvm_vcpu being set, |
1b400ba0 PM |
46 | * we can use tlbiel as long as we mark all other physical |
47 | * cores as potentially having stale TLB entries for this lpid. | |
1b400ba0 PM |
48 | * Otherwise, don't use tlbiel. |
49 | */ | |
55765483 | 50 | if (kvm->arch.online_vcores == 1 && local_paca->kvm_hstate.kvm_vcpu) |
1b400ba0 | 51 | global = 0; |
1b400ba0 | 52 | else |
c17b98cf | 53 | global = 1; |
1b400ba0 PM |
54 | |
55 | if (!global) { | |
56 | /* any other core might now have stale TLB entries... */ | |
57 | smp_wmb(); | |
58 | cpumask_setall(&kvm->arch.need_tlb_flush); | |
59 | cpumask_clear_cpu(local_paca->kvm_hstate.kvm_vcore->pcpu, | |
60 | &kvm->arch.need_tlb_flush); | |
61 | } | |
62 | ||
63 | return global; | |
64 | } | |
65 | ||
06ce2c63 PM |
66 | /* |
67 | * Add this HPTE into the chain for the real page. | |
68 | * Must be called with the chain locked; it unlocks the chain. | |
69 | */ | |
342d3db7 | 70 | void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, |
06ce2c63 PM |
71 | unsigned long *rmap, long pte_index, int realmode) |
72 | { | |
73 | struct revmap_entry *head, *tail; | |
74 | unsigned long i; | |
75 | ||
76 | if (*rmap & KVMPPC_RMAP_PRESENT) { | |
77 | i = *rmap & KVMPPC_RMAP_INDEX; | |
78 | head = &kvm->arch.revmap[i]; | |
79 | if (realmode) | |
80 | head = real_vmalloc_addr(head); | |
81 | tail = &kvm->arch.revmap[head->back]; | |
82 | if (realmode) | |
83 | tail = real_vmalloc_addr(tail); | |
84 | rev->forw = i; | |
85 | rev->back = head->back; | |
86 | tail->forw = pte_index; | |
87 | head->back = pte_index; | |
88 | } else { | |
89 | rev->forw = rev->back = pte_index; | |
4879f241 PM |
90 | *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | |
91 | pte_index | KVMPPC_RMAP_PRESENT; | |
06ce2c63 | 92 | } |
4879f241 | 93 | unlock_rmap(rmap); |
06ce2c63 | 94 | } |
342d3db7 | 95 | EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain); |
06ce2c63 PM |
96 | |
97 | /* Remove this HPTE from the chain for a real page */ | |
98 | static void remove_revmap_chain(struct kvm *kvm, long pte_index, | |
bad3b507 PM |
99 | struct revmap_entry *rev, |
100 | unsigned long hpte_v, unsigned long hpte_r) | |
06ce2c63 | 101 | { |
bad3b507 | 102 | struct revmap_entry *next, *prev; |
06ce2c63 PM |
103 | unsigned long gfn, ptel, head; |
104 | struct kvm_memory_slot *memslot; | |
105 | unsigned long *rmap; | |
bad3b507 | 106 | unsigned long rcbits; |
06ce2c63 | 107 | |
bad3b507 PM |
108 | rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); |
109 | ptel = rev->guest_rpte |= rcbits; | |
06ce2c63 | 110 | gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); |
797f9c07 | 111 | memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); |
dfe49dbd | 112 | if (!memslot) |
06ce2c63 PM |
113 | return; |
114 | ||
d89cc617 | 115 | rmap = real_vmalloc_addr(&memslot->arch.rmap[gfn - memslot->base_gfn]); |
06ce2c63 PM |
116 | lock_rmap(rmap); |
117 | ||
118 | head = *rmap & KVMPPC_RMAP_INDEX; | |
119 | next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]); | |
120 | prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]); | |
121 | next->back = rev->back; | |
122 | prev->forw = rev->forw; | |
123 | if (head == pte_index) { | |
124 | head = rev->forw; | |
125 | if (head == pte_index) | |
126 | *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); | |
127 | else | |
128 | *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; | |
129 | } | |
bad3b507 | 130 | *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT; |
06ce2c63 PM |
131 | unlock_rmap(rmap); |
132 | } | |
133 | ||
7c85e6b3 | 134 | static pte_t lookup_linux_pte_and_update(pgd_t *pgdir, unsigned long hva, |
4cf302bc | 135 | int writing, unsigned long *pte_sizep) |
342d3db7 PM |
136 | { |
137 | pte_t *ptep; | |
138 | unsigned long ps = *pte_sizep; | |
db7cb5b9 | 139 | unsigned int hugepage_shift; |
342d3db7 | 140 | |
db7cb5b9 | 141 | ptep = find_linux_pte_or_hugepte(pgdir, hva, &hugepage_shift); |
342d3db7 PM |
142 | if (!ptep) |
143 | return __pte(0); | |
db7cb5b9 AK |
144 | if (hugepage_shift) |
145 | *pte_sizep = 1ul << hugepage_shift; | |
342d3db7 PM |
146 | else |
147 | *pte_sizep = PAGE_SIZE; | |
148 | if (ps > *pte_sizep) | |
149 | return __pte(0); | |
db7cb5b9 | 150 | return kvmppc_read_update_linux_pte(ptep, writing, hugepage_shift); |
342d3db7 PM |
151 | } |
152 | ||
6f22bd32 | 153 | static inline void unlock_hpte(__be64 *hpte, unsigned long hpte_v) |
a92bce95 PM |
154 | { |
155 | asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); | |
6f22bd32 | 156 | hpte[0] = cpu_to_be64(hpte_v); |
a92bce95 PM |
157 | } |
158 | ||
7ed661bf PM |
159 | long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, |
160 | long pte_index, unsigned long pteh, unsigned long ptel, | |
161 | pgd_t *pgdir, bool realmode, unsigned long *pte_idx_ret) | |
a8606e20 | 162 | { |
c77162de | 163 | unsigned long i, pa, gpa, gfn, psize; |
342d3db7 | 164 | unsigned long slot_fn, hva; |
6f22bd32 | 165 | __be64 *hpte; |
8936dda4 | 166 | struct revmap_entry *rev; |
44e5f6be | 167 | unsigned long g_ptel; |
b2b2f165 | 168 | struct kvm_memory_slot *memslot; |
c17b98cf | 169 | unsigned long pte_size; |
9d0ef5ea | 170 | unsigned long is_io; |
06ce2c63 | 171 | unsigned long *rmap; |
342d3db7 | 172 | pte_t pte; |
4cf302bc | 173 | unsigned int writing; |
342d3db7 | 174 | unsigned long mmu_seq; |
bad3b507 | 175 | unsigned long rcbits; |
c77162de PM |
176 | |
177 | psize = hpte_page_size(pteh, ptel); | |
178 | if (!psize) | |
a8606e20 | 179 | return H_PARAMETER; |
4cf302bc | 180 | writing = hpte_is_writable(ptel); |
697d3899 | 181 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
44e5f6be PM |
182 | ptel &= ~HPTE_GR_RESERVED; |
183 | g_ptel = ptel; | |
b2b2f165 | 184 | |
342d3db7 PM |
185 | /* used later to detect if we might have been invalidated */ |
186 | mmu_seq = kvm->mmu_notifier_seq; | |
187 | smp_rmb(); | |
188 | ||
c77162de PM |
189 | /* Find the memslot (if any) for this address */ |
190 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); | |
191 | gfn = gpa >> PAGE_SHIFT; | |
797f9c07 | 192 | memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); |
697d3899 | 193 | pa = 0; |
342d3db7 | 194 | is_io = ~0ul; |
697d3899 PM |
195 | rmap = NULL; |
196 | if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { | |
697d3899 PM |
197 | /* Emulated MMIO - mark this with key=31 */ |
198 | pteh |= HPTE_V_ABSENT; | |
199 | ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
200 | goto do_insert; | |
201 | } | |
da9d1d7f PM |
202 | |
203 | /* Check if the requested page fits entirely in the memslot. */ | |
204 | if (!slot_is_aligned(memslot, psize)) | |
205 | return H_PARAMETER; | |
c77162de | 206 | slot_fn = gfn - memslot->base_gfn; |
d89cc617 | 207 | rmap = &memslot->arch.rmap[slot_fn]; |
c77162de | 208 | |
c17b98cf PM |
209 | /* Translate to host virtual address */ |
210 | hva = __gfn_to_hva_memslot(memslot, gfn); | |
211 | ||
212 | /* Look up the Linux PTE for the backing page */ | |
213 | pte_size = psize; | |
214 | pte = lookup_linux_pte_and_update(pgdir, hva, writing, &pte_size); | |
8a0516ed | 215 | if (pte_present(pte) && !pte_protnone(pte)) { |
c17b98cf PM |
216 | if (writing && !pte_write(pte)) |
217 | /* make the actual HPTE be read-only */ | |
218 | ptel = hpte_make_readonly(ptel); | |
219 | is_io = hpte_cache_bits(pte_val(pte)); | |
220 | pa = pte_pfn(pte) << PAGE_SHIFT; | |
221 | pa |= hva & (pte_size - 1); | |
caaa4c80 | 222 | pa |= gpa & ~PAGE_MASK; |
342d3db7 | 223 | } |
7ed661bf | 224 | |
c77162de PM |
225 | if (pte_size < psize) |
226 | return H_PARAMETER; | |
c77162de PM |
227 | |
228 | ptel &= ~(HPTE_R_PP0 - psize); | |
229 | ptel |= pa; | |
342d3db7 PM |
230 | |
231 | if (pa) | |
232 | pteh |= HPTE_V_VALID; | |
233 | else | |
234 | pteh |= HPTE_V_ABSENT; | |
c77162de | 235 | |
a8606e20 | 236 | /* Check WIMG */ |
342d3db7 | 237 | if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) { |
9d0ef5ea PM |
238 | if (is_io) |
239 | return H_PARAMETER; | |
240 | /* | |
241 | * Allow guest to map emulated device memory as | |
242 | * uncacheable, but actually make it cacheable. | |
243 | */ | |
244 | ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); | |
245 | ptel |= HPTE_R_M; | |
246 | } | |
075295dd | 247 | |
342d3db7 | 248 | /* Find and lock the HPTEG slot to use */ |
697d3899 | 249 | do_insert: |
32fad281 | 250 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
251 | return H_PARAMETER; |
252 | if (likely((flags & H_EXACT) == 0)) { | |
253 | pte_index &= ~7UL; | |
6f22bd32 | 254 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 255 | for (i = 0; i < 8; ++i) { |
6f22bd32 | 256 | if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0 && |
697d3899 PM |
257 | try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
258 | HPTE_V_ABSENT)) | |
a8606e20 PM |
259 | break; |
260 | hpte += 2; | |
261 | } | |
075295dd PM |
262 | if (i == 8) { |
263 | /* | |
264 | * Since try_lock_hpte doesn't retry (not even stdcx. | |
265 | * failures), it could be that there is a free slot | |
266 | * but we transiently failed to lock it. Try again, | |
267 | * actually locking each slot and checking it. | |
268 | */ | |
269 | hpte -= 16; | |
270 | for (i = 0; i < 8; ++i) { | |
6f22bd32 | 271 | u64 pte; |
075295dd PM |
272 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
273 | cpu_relax(); | |
6f22bd32 AG |
274 | pte = be64_to_cpu(*hpte); |
275 | if (!(pte & (HPTE_V_VALID | HPTE_V_ABSENT))) | |
075295dd | 276 | break; |
6f22bd32 | 277 | *hpte &= ~cpu_to_be64(HPTE_V_HVLOCK); |
075295dd PM |
278 | hpte += 2; |
279 | } | |
280 | if (i == 8) | |
281 | return H_PTEG_FULL; | |
282 | } | |
8936dda4 | 283 | pte_index += i; |
a8606e20 | 284 | } else { |
6f22bd32 | 285 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
697d3899 PM |
286 | if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
287 | HPTE_V_ABSENT)) { | |
075295dd | 288 | /* Lock the slot and check again */ |
6f22bd32 AG |
289 | u64 pte; |
290 | ||
075295dd PM |
291 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
292 | cpu_relax(); | |
6f22bd32 AG |
293 | pte = be64_to_cpu(*hpte); |
294 | if (pte & (HPTE_V_VALID | HPTE_V_ABSENT)) { | |
295 | *hpte &= ~cpu_to_be64(HPTE_V_HVLOCK); | |
075295dd PM |
296 | return H_PTEG_FULL; |
297 | } | |
298 | } | |
a8606e20 | 299 | } |
8936dda4 PM |
300 | |
301 | /* Save away the guest's idea of the second HPTE dword */ | |
06ce2c63 PM |
302 | rev = &kvm->arch.revmap[pte_index]; |
303 | if (realmode) | |
304 | rev = real_vmalloc_addr(rev); | |
44e5f6be | 305 | if (rev) { |
8936dda4 | 306 | rev->guest_rpte = g_ptel; |
44e5f6be PM |
307 | note_hpte_modification(kvm, rev); |
308 | } | |
06ce2c63 PM |
309 | |
310 | /* Link HPTE into reverse-map chain */ | |
697d3899 PM |
311 | if (pteh & HPTE_V_VALID) { |
312 | if (realmode) | |
313 | rmap = real_vmalloc_addr(rmap); | |
314 | lock_rmap(rmap); | |
342d3db7 | 315 | /* Check for pending invalidations under the rmap chain lock */ |
c17b98cf | 316 | if (mmu_notifier_retry(kvm, mmu_seq)) { |
342d3db7 PM |
317 | /* inval in progress, write a non-present HPTE */ |
318 | pteh |= HPTE_V_ABSENT; | |
319 | pteh &= ~HPTE_V_VALID; | |
320 | unlock_rmap(rmap); | |
321 | } else { | |
322 | kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, | |
323 | realmode); | |
bad3b507 PM |
324 | /* Only set R/C in real HPTE if already set in *rmap */ |
325 | rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; | |
326 | ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C); | |
342d3db7 | 327 | } |
697d3899 | 328 | } |
06ce2c63 | 329 | |
6f22bd32 | 330 | hpte[1] = cpu_to_be64(ptel); |
06ce2c63 PM |
331 | |
332 | /* Write the first HPTE dword, unlocking the HPTE and making it valid */ | |
a8606e20 | 333 | eieio(); |
6f22bd32 | 334 | hpte[0] = cpu_to_be64(pteh); |
a8606e20 | 335 | asm volatile("ptesync" : : : "memory"); |
06ce2c63 | 336 | |
7ed661bf | 337 | *pte_idx_ret = pte_index; |
a8606e20 PM |
338 | return H_SUCCESS; |
339 | } | |
7ed661bf PM |
340 | EXPORT_SYMBOL_GPL(kvmppc_do_h_enter); |
341 | ||
342 | long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, | |
343 | long pte_index, unsigned long pteh, unsigned long ptel) | |
344 | { | |
345 | return kvmppc_do_h_enter(vcpu->kvm, flags, pte_index, pteh, ptel, | |
346 | vcpu->arch.pgdir, true, &vcpu->arch.gpr[4]); | |
347 | } | |
a8606e20 | 348 | |
54bb7f4b | 349 | #ifdef __BIG_ENDIAN__ |
a8606e20 | 350 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) |
54bb7f4b AB |
351 | #else |
352 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->paca_index)) | |
353 | #endif | |
a8606e20 PM |
354 | |
355 | static inline int try_lock_tlbie(unsigned int *lock) | |
356 | { | |
357 | unsigned int tmp, old; | |
358 | unsigned int token = LOCK_TOKEN; | |
359 | ||
360 | asm volatile("1:lwarx %1,0,%2\n" | |
361 | " cmpwi cr0,%1,0\n" | |
362 | " bne 2f\n" | |
363 | " stwcx. %3,0,%2\n" | |
364 | " bne- 1b\n" | |
365 | " isync\n" | |
366 | "2:" | |
367 | : "=&r" (tmp), "=&r" (old) | |
368 | : "r" (lock), "r" (token) | |
369 | : "cc", "memory"); | |
370 | return old == 0; | |
371 | } | |
372 | ||
54480501 PM |
373 | static void do_tlbies(struct kvm *kvm, unsigned long *rbvalues, |
374 | long npages, int global, bool need_sync) | |
375 | { | |
376 | long i; | |
377 | ||
54480501 PM |
378 | if (global) { |
379 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) | |
380 | cpu_relax(); | |
381 | if (need_sync) | |
382 | asm volatile("ptesync" : : : "memory"); | |
383 | for (i = 0; i < npages; ++i) | |
384 | asm volatile(PPC_TLBIE(%1,%0) : : | |
385 | "r" (rbvalues[i]), "r" (kvm->arch.lpid)); | |
386 | asm volatile("eieio; tlbsync; ptesync" : : : "memory"); | |
387 | kvm->arch.tlbie_lock = 0; | |
388 | } else { | |
389 | if (need_sync) | |
390 | asm volatile("ptesync" : : : "memory"); | |
391 | for (i = 0; i < npages; ++i) | |
392 | asm volatile("tlbiel %0" : : "r" (rbvalues[i])); | |
393 | asm volatile("ptesync" : : : "memory"); | |
394 | } | |
395 | } | |
396 | ||
6b445ad4 PM |
397 | long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags, |
398 | unsigned long pte_index, unsigned long avpn, | |
399 | unsigned long *hpret) | |
a8606e20 | 400 | { |
6f22bd32 | 401 | __be64 *hpte; |
a8606e20 | 402 | unsigned long v, r, rb; |
a92bce95 | 403 | struct revmap_entry *rev; |
6f22bd32 | 404 | u64 pte; |
a8606e20 | 405 | |
32fad281 | 406 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 | 407 | return H_PARAMETER; |
6f22bd32 | 408 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 409 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 410 | cpu_relax(); |
6f22bd32 AG |
411 | pte = be64_to_cpu(hpte[0]); |
412 | if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || | |
413 | ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) || | |
414 | ((flags & H_ANDCOND) && (pte & avpn) != 0)) { | |
415 | hpte[0] &= ~cpu_to_be64(HPTE_V_HVLOCK); | |
a8606e20 PM |
416 | return H_NOT_FOUND; |
417 | } | |
a92bce95 PM |
418 | |
419 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
6f22bd32 | 420 | v = pte & ~HPTE_V_HVLOCK; |
a92bce95 | 421 | if (v & HPTE_V_VALID) { |
6f22bd32 AG |
422 | u64 pte1; |
423 | ||
424 | pte1 = be64_to_cpu(hpte[1]); | |
425 | hpte[0] &= ~cpu_to_be64(HPTE_V_VALID); | |
426 | rb = compute_tlbie_rb(v, pte1, pte_index); | |
54480501 | 427 | do_tlbies(kvm, &rb, 1, global_invalidates(kvm, flags), true); |
bad3b507 | 428 | /* Read PTE low word after tlbie to get final R/C values */ |
6f22bd32 | 429 | remove_revmap_chain(kvm, pte_index, rev, v, pte1); |
a8606e20 | 430 | } |
44e5f6be PM |
431 | r = rev->guest_rpte & ~HPTE_GR_RESERVED; |
432 | note_hpte_modification(kvm, rev); | |
a92bce95 PM |
433 | unlock_hpte(hpte, 0); |
434 | ||
6b445ad4 PM |
435 | hpret[0] = v; |
436 | hpret[1] = r; | |
a8606e20 PM |
437 | return H_SUCCESS; |
438 | } | |
6b445ad4 PM |
439 | EXPORT_SYMBOL_GPL(kvmppc_do_h_remove); |
440 | ||
441 | long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, | |
442 | unsigned long pte_index, unsigned long avpn) | |
443 | { | |
444 | return kvmppc_do_h_remove(vcpu->kvm, flags, pte_index, avpn, | |
445 | &vcpu->arch.gpr[4]); | |
446 | } | |
a8606e20 PM |
447 | |
448 | long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) | |
449 | { | |
450 | struct kvm *kvm = vcpu->kvm; | |
451 | unsigned long *args = &vcpu->arch.gpr[4]; | |
6f22bd32 AG |
452 | __be64 *hp, *hptes[4]; |
453 | unsigned long tlbrb[4]; | |
a92bce95 PM |
454 | long int i, j, k, n, found, indexes[4]; |
455 | unsigned long flags, req, pte_index, rcbits; | |
54480501 | 456 | int global; |
a8606e20 | 457 | long int ret = H_SUCCESS; |
a92bce95 | 458 | struct revmap_entry *rev, *revs[4]; |
6f22bd32 | 459 | u64 hp0; |
a8606e20 | 460 | |
54480501 | 461 | global = global_invalidates(kvm, 0); |
a92bce95 PM |
462 | for (i = 0; i < 4 && ret == H_SUCCESS; ) { |
463 | n = 0; | |
464 | for (; i < 4; ++i) { | |
465 | j = i * 2; | |
466 | pte_index = args[j]; | |
467 | flags = pte_index >> 56; | |
468 | pte_index &= ((1ul << 56) - 1); | |
469 | req = flags >> 6; | |
470 | flags &= 3; | |
471 | if (req == 3) { /* no more requests */ | |
472 | i = 4; | |
a8606e20 | 473 | break; |
a92bce95 | 474 | } |
32fad281 PM |
475 | if (req != 1 || flags == 3 || |
476 | pte_index >= kvm->arch.hpt_npte) { | |
a92bce95 PM |
477 | /* parameter error */ |
478 | args[j] = ((0xa0 | flags) << 56) + pte_index; | |
479 | ret = H_PARAMETER; | |
a8606e20 | 480 | break; |
a92bce95 | 481 | } |
6f22bd32 | 482 | hp = (__be64 *) (kvm->arch.hpt_virt + (pte_index << 4)); |
a92bce95 PM |
483 | /* to avoid deadlock, don't spin except for first */ |
484 | if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) { | |
485 | if (n) | |
486 | break; | |
487 | while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) | |
488 | cpu_relax(); | |
489 | } | |
490 | found = 0; | |
6f22bd32 AG |
491 | hp0 = be64_to_cpu(hp[0]); |
492 | if (hp0 & (HPTE_V_ABSENT | HPTE_V_VALID)) { | |
a92bce95 PM |
493 | switch (flags & 3) { |
494 | case 0: /* absolute */ | |
a8606e20 | 495 | found = 1; |
a92bce95 PM |
496 | break; |
497 | case 1: /* andcond */ | |
6f22bd32 | 498 | if (!(hp0 & args[j + 1])) |
a92bce95 PM |
499 | found = 1; |
500 | break; | |
501 | case 2: /* AVPN */ | |
6f22bd32 | 502 | if ((hp0 & ~0x7fUL) == args[j + 1]) |
a92bce95 PM |
503 | found = 1; |
504 | break; | |
505 | } | |
506 | } | |
507 | if (!found) { | |
6f22bd32 | 508 | hp[0] &= ~cpu_to_be64(HPTE_V_HVLOCK); |
a92bce95 PM |
509 | args[j] = ((0x90 | flags) << 56) + pte_index; |
510 | continue; | |
a8606e20 | 511 | } |
a92bce95 PM |
512 | |
513 | args[j] = ((0x80 | flags) << 56) + pte_index; | |
514 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
44e5f6be | 515 | note_hpte_modification(kvm, rev); |
a92bce95 | 516 | |
6f22bd32 | 517 | if (!(hp0 & HPTE_V_VALID)) { |
bad3b507 PM |
518 | /* insert R and C bits from PTE */ |
519 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); | |
520 | args[j] |= rcbits << (56 - 5); | |
51bfd299 | 521 | hp[0] = 0; |
a92bce95 | 522 | continue; |
bad3b507 | 523 | } |
a92bce95 | 524 | |
6f22bd32 AG |
525 | /* leave it locked */ |
526 | hp[0] &= ~cpu_to_be64(HPTE_V_VALID); | |
527 | tlbrb[n] = compute_tlbie_rb(be64_to_cpu(hp[0]), | |
528 | be64_to_cpu(hp[1]), pte_index); | |
a92bce95 PM |
529 | indexes[n] = j; |
530 | hptes[n] = hp; | |
531 | revs[n] = rev; | |
532 | ++n; | |
a8606e20 | 533 | } |
a92bce95 PM |
534 | |
535 | if (!n) | |
536 | break; | |
537 | ||
538 | /* Now that we've collected a batch, do the tlbies */ | |
54480501 | 539 | do_tlbies(kvm, tlbrb, n, global, true); |
a92bce95 | 540 | |
bad3b507 | 541 | /* Read PTE low words after tlbie to get final R/C values */ |
a92bce95 PM |
542 | for (k = 0; k < n; ++k) { |
543 | j = indexes[k]; | |
544 | pte_index = args[j] & ((1ul << 56) - 1); | |
545 | hp = hptes[k]; | |
546 | rev = revs[k]; | |
6f22bd32 AG |
547 | remove_revmap_chain(kvm, pte_index, rev, |
548 | be64_to_cpu(hp[0]), be64_to_cpu(hp[1])); | |
bad3b507 PM |
549 | rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); |
550 | args[j] |= rcbits << (56 - 5); | |
551 | hp[0] = 0; | |
697d3899 | 552 | } |
a8606e20 | 553 | } |
a92bce95 | 554 | |
a8606e20 PM |
555 | return ret; |
556 | } | |
557 | ||
558 | long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, | |
559 | unsigned long pte_index, unsigned long avpn, | |
560 | unsigned long va) | |
561 | { | |
562 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 | 563 | __be64 *hpte; |
8936dda4 PM |
564 | struct revmap_entry *rev; |
565 | unsigned long v, r, rb, mask, bits; | |
6f22bd32 | 566 | u64 pte; |
a8606e20 | 567 | |
32fad281 | 568 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 | 569 | return H_PARAMETER; |
697d3899 | 570 | |
6f22bd32 | 571 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
075295dd | 572 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
a8606e20 | 573 | cpu_relax(); |
6f22bd32 AG |
574 | pte = be64_to_cpu(hpte[0]); |
575 | if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || | |
576 | ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn)) { | |
577 | hpte[0] &= ~cpu_to_be64(HPTE_V_HVLOCK); | |
a8606e20 PM |
578 | return H_NOT_FOUND; |
579 | } | |
697d3899 | 580 | |
6f22bd32 | 581 | v = pte; |
8936dda4 PM |
582 | bits = (flags << 55) & HPTE_R_PP0; |
583 | bits |= (flags << 48) & HPTE_R_KEY_HI; | |
584 | bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); | |
585 | ||
586 | /* Update guest view of 2nd HPTE dword */ | |
587 | mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | | |
588 | HPTE_R_KEY_HI | HPTE_R_KEY_LO; | |
589 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); | |
590 | if (rev) { | |
591 | r = (rev->guest_rpte & ~mask) | bits; | |
592 | rev->guest_rpte = r; | |
44e5f6be | 593 | note_hpte_modification(kvm, rev); |
8936dda4 | 594 | } |
8936dda4 PM |
595 | |
596 | /* Update HPTE */ | |
697d3899 | 597 | if (v & HPTE_V_VALID) { |
1cc8ed0b | 598 | /* |
b4a83900 PM |
599 | * If the page is valid, don't let it transition from |
600 | * readonly to writable. If it should be writable, we'll | |
601 | * take a trap and let the page fault code sort it out. | |
1cc8ed0b | 602 | */ |
b4a83900 PM |
603 | pte = be64_to_cpu(hpte[1]); |
604 | r = (pte & ~mask) | bits; | |
c17b98cf | 605 | if (hpte_is_writable(r) && !hpte_is_writable(pte)) |
b4a83900 PM |
606 | r = hpte_make_readonly(r); |
607 | /* If the PTE is changing, invalidate it first */ | |
608 | if (r != pte) { | |
609 | rb = compute_tlbie_rb(v, r, pte_index); | |
610 | hpte[0] = cpu_to_be64((v & ~HPTE_V_VALID) | | |
611 | HPTE_V_ABSENT); | |
612 | do_tlbies(kvm, &rb, 1, global_invalidates(kvm, flags), | |
613 | true); | |
614 | hpte[1] = cpu_to_be64(r); | |
1cc8ed0b | 615 | } |
a8606e20 | 616 | } |
b4a83900 | 617 | unlock_hpte(hpte, v & ~HPTE_V_HVLOCK); |
a8606e20 PM |
618 | asm volatile("ptesync" : : : "memory"); |
619 | return H_SUCCESS; | |
620 | } | |
621 | ||
a8606e20 PM |
622 | long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, |
623 | unsigned long pte_index) | |
624 | { | |
625 | struct kvm *kvm = vcpu->kvm; | |
6f22bd32 AG |
626 | __be64 *hpte; |
627 | unsigned long v, r; | |
a8606e20 | 628 | int i, n = 1; |
8936dda4 | 629 | struct revmap_entry *rev = NULL; |
a8606e20 | 630 | |
32fad281 | 631 | if (pte_index >= kvm->arch.hpt_npte) |
a8606e20 PM |
632 | return H_PARAMETER; |
633 | if (flags & H_READ_4) { | |
634 | pte_index &= ~3; | |
635 | n = 4; | |
636 | } | |
bad3b507 | 637 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
a8606e20 | 638 | for (i = 0; i < n; ++i, ++pte_index) { |
6f22bd32 AG |
639 | hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4)); |
640 | v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK; | |
641 | r = be64_to_cpu(hpte[1]); | |
697d3899 PM |
642 | if (v & HPTE_V_ABSENT) { |
643 | v &= ~HPTE_V_ABSENT; | |
644 | v |= HPTE_V_VALID; | |
645 | } | |
44e5f6be | 646 | if (v & HPTE_V_VALID) { |
bad3b507 | 647 | r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C)); |
44e5f6be PM |
648 | r &= ~HPTE_GR_RESERVED; |
649 | } | |
697d3899 | 650 | vcpu->arch.gpr[4 + i * 2] = v; |
a8606e20 PM |
651 | vcpu->arch.gpr[5 + i * 2] = r; |
652 | } | |
653 | return H_SUCCESS; | |
654 | } | |
697d3899 | 655 | |
6f22bd32 | 656 | void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep, |
342d3db7 PM |
657 | unsigned long pte_index) |
658 | { | |
659 | unsigned long rb; | |
660 | ||
6f22bd32 AG |
661 | hptep[0] &= ~cpu_to_be64(HPTE_V_VALID); |
662 | rb = compute_tlbie_rb(be64_to_cpu(hptep[0]), be64_to_cpu(hptep[1]), | |
663 | pte_index); | |
54480501 | 664 | do_tlbies(kvm, &rb, 1, 1, true); |
342d3db7 PM |
665 | } |
666 | EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); | |
667 | ||
6f22bd32 | 668 | void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep, |
55514893 PM |
669 | unsigned long pte_index) |
670 | { | |
671 | unsigned long rb; | |
672 | unsigned char rbyte; | |
673 | ||
6f22bd32 AG |
674 | rb = compute_tlbie_rb(be64_to_cpu(hptep[0]), be64_to_cpu(hptep[1]), |
675 | pte_index); | |
676 | rbyte = (be64_to_cpu(hptep[1]) & ~HPTE_R_R) >> 8; | |
55514893 PM |
677 | /* modify only the second-last byte, which contains the ref bit */ |
678 | *((char *)hptep + 14) = rbyte; | |
54480501 | 679 | do_tlbies(kvm, &rb, 1, 1, false); |
55514893 PM |
680 | } |
681 | EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); | |
682 | ||
697d3899 PM |
683 | static int slb_base_page_shift[4] = { |
684 | 24, /* 16M */ | |
685 | 16, /* 64k */ | |
686 | 34, /* 16G */ | |
687 | 20, /* 1M, unsupported */ | |
688 | }; | |
689 | ||
91648ec0 | 690 | /* When called from virtmode, this func should be protected by |
691 | * preempt_disable(), otherwise, the holding of HPTE_V_HVLOCK | |
692 | * can trigger deadlock issue. | |
693 | */ | |
697d3899 PM |
694 | long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, |
695 | unsigned long valid) | |
696 | { | |
697 | unsigned int i; | |
698 | unsigned int pshift; | |
699 | unsigned long somask; | |
700 | unsigned long vsid, hash; | |
701 | unsigned long avpn; | |
6f22bd32 | 702 | __be64 *hpte; |
697d3899 PM |
703 | unsigned long mask, val; |
704 | unsigned long v, r; | |
705 | ||
706 | /* Get page shift, work out hash and AVPN etc. */ | |
707 | mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; | |
708 | val = 0; | |
709 | pshift = 12; | |
710 | if (slb_v & SLB_VSID_L) { | |
711 | mask |= HPTE_V_LARGE; | |
712 | val |= HPTE_V_LARGE; | |
713 | pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; | |
714 | } | |
715 | if (slb_v & SLB_VSID_B_1T) { | |
716 | somask = (1UL << 40) - 1; | |
717 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; | |
718 | vsid ^= vsid << 25; | |
719 | } else { | |
720 | somask = (1UL << 28) - 1; | |
721 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; | |
722 | } | |
32fad281 | 723 | hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvm->arch.hpt_mask; |
697d3899 PM |
724 | avpn = slb_v & ~(somask >> 16); /* also includes B */ |
725 | avpn |= (eaddr & somask) >> 16; | |
726 | ||
727 | if (pshift >= 24) | |
728 | avpn &= ~((1UL << (pshift - 16)) - 1); | |
729 | else | |
730 | avpn &= ~0x7fUL; | |
731 | val |= avpn; | |
732 | ||
733 | for (;;) { | |
6f22bd32 | 734 | hpte = (__be64 *)(kvm->arch.hpt_virt + (hash << 7)); |
697d3899 PM |
735 | |
736 | for (i = 0; i < 16; i += 2) { | |
737 | /* Read the PTE racily */ | |
6f22bd32 | 738 | v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK; |
697d3899 PM |
739 | |
740 | /* Check valid/absent, hash, segment size and AVPN */ | |
741 | if (!(v & valid) || (v & mask) != val) | |
742 | continue; | |
743 | ||
744 | /* Lock the PTE and read it under the lock */ | |
745 | while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) | |
746 | cpu_relax(); | |
6f22bd32 AG |
747 | v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK; |
748 | r = be64_to_cpu(hpte[i+1]); | |
697d3899 PM |
749 | |
750 | /* | |
341acbb3 | 751 | * Check the HPTE again, including base page size |
697d3899 PM |
752 | */ |
753 | if ((v & valid) && (v & mask) == val && | |
341acbb3 | 754 | hpte_base_page_size(v, r) == (1ul << pshift)) |
697d3899 PM |
755 | /* Return with the HPTE still locked */ |
756 | return (hash << 3) + (i >> 1); | |
757 | ||
758 | /* Unlock and move on */ | |
6f22bd32 | 759 | hpte[i] = cpu_to_be64(v); |
697d3899 PM |
760 | } |
761 | ||
762 | if (val & HPTE_V_SECONDARY) | |
763 | break; | |
764 | val |= HPTE_V_SECONDARY; | |
32fad281 | 765 | hash = hash ^ kvm->arch.hpt_mask; |
697d3899 PM |
766 | } |
767 | return -1; | |
768 | } | |
769 | EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); | |
770 | ||
771 | /* | |
772 | * Called in real mode to check whether an HPTE not found fault | |
4cf302bc PM |
773 | * is due to accessing a paged-out page or an emulated MMIO page, |
774 | * or if a protection fault is due to accessing a page that the | |
775 | * guest wanted read/write access to but which we made read-only. | |
697d3899 PM |
776 | * Returns a possibly modified status (DSISR) value if not |
777 | * (i.e. pass the interrupt to the guest), | |
778 | * -1 to pass the fault up to host kernel mode code, -2 to do that | |
342d3db7 | 779 | * and also load the instruction word (for MMIO emulation), |
697d3899 PM |
780 | * or 0 if we should make the guest retry the access. |
781 | */ | |
782 | long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, | |
342d3db7 | 783 | unsigned long slb_v, unsigned int status, bool data) |
697d3899 PM |
784 | { |
785 | struct kvm *kvm = vcpu->kvm; | |
786 | long int index; | |
787 | unsigned long v, r, gr; | |
6f22bd32 | 788 | __be64 *hpte; |
697d3899 PM |
789 | unsigned long valid; |
790 | struct revmap_entry *rev; | |
791 | unsigned long pp, key; | |
792 | ||
4cf302bc PM |
793 | /* For protection fault, expect to find a valid HPTE */ |
794 | valid = HPTE_V_VALID; | |
795 | if (status & DSISR_NOHPTE) | |
796 | valid |= HPTE_V_ABSENT; | |
342d3db7 | 797 | |
697d3899 | 798 | index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); |
4cf302bc PM |
799 | if (index < 0) { |
800 | if (status & DSISR_NOHPTE) | |
801 | return status; /* there really was no HPTE */ | |
802 | return 0; /* for prot fault, HPTE disappeared */ | |
803 | } | |
6f22bd32 AG |
804 | hpte = (__be64 *)(kvm->arch.hpt_virt + (index << 4)); |
805 | v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK; | |
806 | r = be64_to_cpu(hpte[1]); | |
697d3899 PM |
807 | rev = real_vmalloc_addr(&kvm->arch.revmap[index]); |
808 | gr = rev->guest_rpte; | |
809 | ||
a92bce95 | 810 | unlock_hpte(hpte, v); |
697d3899 | 811 | |
4cf302bc PM |
812 | /* For not found, if the HPTE is valid by now, retry the instruction */ |
813 | if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) | |
697d3899 PM |
814 | return 0; |
815 | ||
816 | /* Check access permissions to the page */ | |
817 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); | |
818 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; | |
342d3db7 PM |
819 | status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */ |
820 | if (!data) { | |
821 | if (gr & (HPTE_R_N | HPTE_R_G)) | |
822 | return status | SRR1_ISI_N_OR_G; | |
823 | if (!hpte_read_permission(pp, slb_v & key)) | |
824 | return status | SRR1_ISI_PROT; | |
825 | } else if (status & DSISR_ISSTORE) { | |
697d3899 PM |
826 | /* check write permission */ |
827 | if (!hpte_write_permission(pp, slb_v & key)) | |
342d3db7 | 828 | return status | DSISR_PROTFAULT; |
697d3899 PM |
829 | } else { |
830 | if (!hpte_read_permission(pp, slb_v & key)) | |
342d3db7 | 831 | return status | DSISR_PROTFAULT; |
697d3899 PM |
832 | } |
833 | ||
834 | /* Check storage key, if applicable */ | |
342d3db7 | 835 | if (data && (vcpu->arch.shregs.msr & MSR_DR)) { |
697d3899 PM |
836 | unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); |
837 | if (status & DSISR_ISSTORE) | |
838 | perm >>= 1; | |
839 | if (perm & 1) | |
342d3db7 | 840 | return status | DSISR_KEYFAULT; |
697d3899 PM |
841 | } |
842 | ||
843 | /* Save HPTE info for virtual-mode handler */ | |
844 | vcpu->arch.pgfault_addr = addr; | |
845 | vcpu->arch.pgfault_index = index; | |
846 | vcpu->arch.pgfault_hpte[0] = v; | |
847 | vcpu->arch.pgfault_hpte[1] = r; | |
848 | ||
342d3db7 PM |
849 | /* Check the storage key to see if it is possibly emulated MMIO */ |
850 | if (data && (vcpu->arch.shregs.msr & MSR_IR) && | |
851 | (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) == | |
852 | (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) | |
697d3899 PM |
853 | return -2; /* MMIO emulation - load instr word */ |
854 | ||
855 | return -1; /* send fault up to host kernel mode */ | |
697d3899 | 856 | } |