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01235180 AG |
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 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program; if not, write to the Free Software | |
13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
14 | * | |
15 | * Copyright SUSE Linux Products GmbH 2009 | |
16 | * | |
17 | * Authors: Alexander Graf <agraf@suse.de> | |
18 | */ | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/kvm.h> | |
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/highmem.h> | |
25 | ||
26 | #include <asm/tlbflush.h> | |
27 | #include <asm/kvm_ppc.h> | |
28 | #include <asm/kvm_book3s.h> | |
29 | ||
30 | /* #define DEBUG_MMU */ | |
31 | /* #define DEBUG_MMU_PTE */ | |
32 | /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ | |
33 | ||
34 | #ifdef DEBUG_MMU | |
35 | #define dprintk(X...) printk(KERN_INFO X) | |
36 | #else | |
37 | #define dprintk(X...) do { } while(0) | |
38 | #endif | |
39 | ||
e425a6de | 40 | #ifdef DEBUG_MMU_PTE |
01235180 AG |
41 | #define dprintk_pte(X...) printk(KERN_INFO X) |
42 | #else | |
43 | #define dprintk_pte(X...) do { } while(0) | |
44 | #endif | |
45 | ||
46 | #define PTEG_FLAG_ACCESSED 0x00000100 | |
47 | #define PTEG_FLAG_DIRTY 0x00000080 | |
07b0907d AG |
48 | #ifndef SID_SHIFT |
49 | #define SID_SHIFT 28 | |
50 | #endif | |
01235180 AG |
51 | |
52 | static inline bool check_debug_ip(struct kvm_vcpu *vcpu) | |
53 | { | |
54 | #ifdef DEBUG_MMU_PTE_IP | |
55 | return vcpu->arch.pc == DEBUG_MMU_PTE_IP; | |
56 | #else | |
57 | return true; | |
58 | #endif | |
59 | } | |
60 | ||
8e865178 AG |
61 | static inline u32 sr_vsid(u32 sr_raw) |
62 | { | |
63 | return sr_raw & 0x0fffffff; | |
64 | } | |
65 | ||
66 | static inline bool sr_valid(u32 sr_raw) | |
67 | { | |
68 | return (sr_raw & 0x80000000) ? false : true; | |
69 | } | |
70 | ||
71 | static inline bool sr_ks(u32 sr_raw) | |
72 | { | |
73 | return (sr_raw & 0x40000000) ? true: false; | |
74 | } | |
75 | ||
76 | static inline bool sr_kp(u32 sr_raw) | |
77 | { | |
78 | return (sr_raw & 0x20000000) ? true: false; | |
79 | } | |
80 | ||
81 | static inline bool sr_nx(u32 sr_raw) | |
82 | { | |
83 | return (sr_raw & 0x10000000) ? true: false; | |
84 | } | |
85 | ||
01235180 | 86 | static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, |
93b159b4 PM |
87 | struct kvmppc_pte *pte, bool data, |
88 | bool iswrite); | |
af7b4d10 | 89 | static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, |
4b389ca2 | 90 | u64 *vsid); |
01235180 | 91 | |
df1bfa25 | 92 | static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) |
01235180 | 93 | { |
5deb8e7a | 94 | return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf); |
01235180 AG |
95 | } |
96 | ||
97 | static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, | |
98 | bool data) | |
99 | { | |
4b389ca2 | 100 | u64 vsid; |
01235180 AG |
101 | struct kvmppc_pte pte; |
102 | ||
93b159b4 | 103 | if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false)) |
01235180 AG |
104 | return pte.vpage; |
105 | ||
4b389ca2 AG |
106 | kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); |
107 | return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); | |
01235180 AG |
108 | } |
109 | ||
110 | static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) | |
111 | { | |
112 | kvmppc_set_msr(vcpu, 0); | |
113 | } | |
114 | ||
3ff95502 | 115 | static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, |
8e865178 | 116 | u32 sre, gva_t eaddr, |
01235180 AG |
117 | bool primary) |
118 | { | |
3ff95502 | 119 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); |
01235180 AG |
120 | u32 page, hash, pteg, htabmask; |
121 | hva_t r; | |
122 | ||
123 | page = (eaddr & 0x0FFFFFFF) >> 12; | |
124 | htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; | |
125 | ||
8e865178 | 126 | hash = ((sr_vsid(sre) ^ page) << 6); |
01235180 AG |
127 | if (!primary) |
128 | hash = ~hash; | |
129 | hash &= htabmask; | |
130 | ||
131 | pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; | |
132 | ||
133 | dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", | |
cd087eef | 134 | kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg, |
8e865178 | 135 | sr_vsid(sre)); |
01235180 | 136 | |
3ff95502 | 137 | r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT); |
01235180 AG |
138 | if (kvm_is_error_hva(r)) |
139 | return r; | |
140 | return r | (pteg & ~PAGE_MASK); | |
141 | } | |
142 | ||
8e865178 | 143 | static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary) |
01235180 | 144 | { |
8e865178 | 145 | return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) | |
01235180 AG |
146 | (primary ? 0 : 0x40) | 0x80000000; |
147 | } | |
148 | ||
149 | static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, | |
93b159b4 PM |
150 | struct kvmppc_pte *pte, bool data, |
151 | bool iswrite) | |
01235180 AG |
152 | { |
153 | struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); | |
154 | struct kvmppc_bat *bat; | |
155 | int i; | |
156 | ||
157 | for (i = 0; i < 8; i++) { | |
158 | if (data) | |
159 | bat = &vcpu_book3s->dbat[i]; | |
160 | else | |
161 | bat = &vcpu_book3s->ibat[i]; | |
162 | ||
5deb8e7a | 163 | if (kvmppc_get_msr(vcpu) & MSR_PR) { |
01235180 AG |
164 | if (!bat->vp) |
165 | continue; | |
166 | } else { | |
167 | if (!bat->vs) | |
168 | continue; | |
169 | } | |
170 | ||
171 | if (check_debug_ip(vcpu)) | |
172 | { | |
173 | dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", | |
174 | data ? 'd' : 'i', i, eaddr, bat->bepi, | |
175 | bat->bepi_mask); | |
176 | } | |
177 | if ((eaddr & bat->bepi_mask) == bat->bepi) { | |
4b389ca2 AG |
178 | u64 vsid; |
179 | kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, | |
180 | eaddr >> SID_SHIFT, &vsid); | |
181 | vsid <<= 16; | |
182 | pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; | |
183 | ||
01235180 | 184 | pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); |
01235180 AG |
185 | pte->may_read = bat->pp; |
186 | pte->may_write = bat->pp > 1; | |
187 | pte->may_execute = true; | |
188 | if (!pte->may_read) { | |
189 | printk(KERN_INFO "BAT is not readable!\n"); | |
190 | continue; | |
191 | } | |
93b159b4 | 192 | if (iswrite && !pte->may_write) { |
01235180 AG |
193 | dprintk_pte("BAT is read-only!\n"); |
194 | continue; | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | } | |
200 | ||
201 | return -ENOENT; | |
202 | } | |
203 | ||
204 | static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, | |
205 | struct kvmppc_pte *pte, bool data, | |
93b159b4 | 206 | bool iswrite, bool primary) |
01235180 | 207 | { |
8e865178 | 208 | u32 sre; |
01235180 AG |
209 | hva_t ptegp; |
210 | u32 pteg[16]; | |
860540bc | 211 | u32 pte0, pte1; |
af7b4d10 | 212 | u32 ptem = 0; |
01235180 AG |
213 | int i; |
214 | int found = 0; | |
215 | ||
df1bfa25 | 216 | sre = find_sr(vcpu, eaddr); |
01235180 AG |
217 | |
218 | dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, | |
8e865178 | 219 | sr_vsid(sre), sre); |
01235180 AG |
220 | |
221 | pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); | |
222 | ||
3ff95502 | 223 | ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary); |
01235180 AG |
224 | if (kvm_is_error_hva(ptegp)) { |
225 | printk(KERN_INFO "KVM: Invalid PTEG!\n"); | |
226 | goto no_page_found; | |
227 | } | |
228 | ||
229 | ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); | |
230 | ||
231 | if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { | |
232 | printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp); | |
233 | goto no_page_found; | |
234 | } | |
235 | ||
236 | for (i=0; i<16; i+=2) { | |
860540bc AG |
237 | pte0 = be32_to_cpu(pteg[i]); |
238 | pte1 = be32_to_cpu(pteg[i + 1]); | |
239 | if (ptem == pte0) { | |
01235180 AG |
240 | u8 pp; |
241 | ||
860540bc AG |
242 | pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF); |
243 | pp = pte1 & 3; | |
01235180 | 244 | |
5deb8e7a AG |
245 | if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) || |
246 | (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR))) | |
01235180 AG |
247 | pp |= 4; |
248 | ||
249 | pte->may_write = false; | |
250 | pte->may_read = false; | |
251 | pte->may_execute = true; | |
252 | switch (pp) { | |
253 | case 0: | |
254 | case 1: | |
255 | case 2: | |
256 | case 6: | |
257 | pte->may_write = true; | |
258 | case 3: | |
259 | case 5: | |
260 | case 7: | |
261 | pte->may_read = true; | |
262 | break; | |
263 | } | |
264 | ||
01235180 | 265 | dprintk_pte("MMU: Found PTE -> %x %x - %x\n", |
860540bc | 266 | pte0, pte1, pp); |
01235180 AG |
267 | found = 1; |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
272 | /* Update PTE C and A bits, so the guest's swapper knows we used the | |
273 | page */ | |
274 | if (found) { | |
860540bc | 275 | u32 pte_r = pte1; |
740f834e | 276 | char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32)); |
9308ab8e PM |
277 | |
278 | /* | |
279 | * Use single-byte writes to update the HPTE, to | |
280 | * conform to what real hardware does. | |
281 | */ | |
282 | if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) { | |
283 | pte_r |= PTEG_FLAG_ACCESSED; | |
284 | put_user(pte_r >> 8, addr + 2); | |
285 | } | |
93b159b4 | 286 | if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) { |
9308ab8e PM |
287 | pte_r |= PTEG_FLAG_DIRTY; |
288 | put_user(pte_r, addr + 3); | |
289 | } | |
93b159b4 PM |
290 | if (!pte->may_read || (iswrite && !pte->may_write)) |
291 | return -EPERM; | |
01235180 AG |
292 | return 0; |
293 | } | |
294 | ||
295 | no_page_found: | |
296 | ||
297 | if (check_debug_ip(vcpu)) { | |
298 | dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", | |
299 | to_book3s(vcpu)->sdr1, ptegp); | |
300 | for (i=0; i<16; i+=2) { | |
53021042 | 301 | dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n", |
860540bc AG |
302 | i, be32_to_cpu(pteg[i]), |
303 | be32_to_cpu(pteg[i+1]), ptem); | |
01235180 AG |
304 | } |
305 | } | |
306 | ||
307 | return -ENOENT; | |
308 | } | |
309 | ||
310 | static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, | |
93b159b4 PM |
311 | struct kvmppc_pte *pte, bool data, |
312 | bool iswrite) | |
01235180 AG |
313 | { |
314 | int r; | |
e8508940 | 315 | ulong mp_ea = vcpu->arch.magic_page_ea; |
01235180 AG |
316 | |
317 | pte->eaddr = eaddr; | |
c9029c34 | 318 | pte->page_size = MMU_PAGE_4K; |
e8508940 AG |
319 | |
320 | /* Magic page override */ | |
321 | if (unlikely(mp_ea) && | |
322 | unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && | |
5deb8e7a | 323 | !(kvmppc_get_msr(vcpu) & MSR_PR)) { |
e8508940 AG |
324 | pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); |
325 | pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); | |
326 | pte->raddr &= KVM_PAM; | |
327 | pte->may_execute = true; | |
328 | pte->may_read = true; | |
329 | pte->may_write = true; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
93b159b4 | 334 | r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite); |
01235180 | 335 | if (r < 0) |
93b159b4 PM |
336 | r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, |
337 | data, iswrite, true); | |
01235180 | 338 | if (r < 0) |
93b159b4 PM |
339 | r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, |
340 | data, iswrite, false); | |
01235180 AG |
341 | |
342 | return r; | |
343 | } | |
344 | ||
345 | ||
346 | static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) | |
347 | { | |
5deb8e7a | 348 | return kvmppc_get_sr(vcpu, srnum); |
01235180 AG |
349 | } |
350 | ||
351 | static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, | |
352 | ulong value) | |
353 | { | |
5deb8e7a | 354 | kvmppc_set_sr(vcpu, srnum, value); |
01235180 AG |
355 | kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); |
356 | } | |
357 | ||
358 | static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) | |
359 | { | |
9308ab8e PM |
360 | int i; |
361 | struct kvm_vcpu *v; | |
362 | ||
363 | /* flush this VA on all cpus */ | |
364 | kvm_for_each_vcpu(i, v, vcpu->kvm) | |
365 | kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000); | |
01235180 AG |
366 | } |
367 | ||
af7b4d10 | 368 | static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, |
01235180 AG |
369 | u64 *vsid) |
370 | { | |
f7bc74e1 | 371 | ulong ea = esid << SID_SHIFT; |
8e865178 | 372 | u32 sr; |
f7bc74e1 | 373 | u64 gvsid = esid; |
5deb8e7a | 374 | u64 msr = kvmppc_get_msr(vcpu); |
f7bc74e1 | 375 | |
5deb8e7a | 376 | if (msr & (MSR_DR|MSR_IR)) { |
df1bfa25 | 377 | sr = find_sr(vcpu, ea); |
8e865178 AG |
378 | if (sr_valid(sr)) |
379 | gvsid = sr_vsid(sr); | |
f7bc74e1 AG |
380 | } |
381 | ||
01235180 AG |
382 | /* In case we only have one of MSR_IR or MSR_DR set, let's put |
383 | that in the real-mode context (and hope RM doesn't access | |
384 | high memory) */ | |
5deb8e7a | 385 | switch (msr & (MSR_DR|MSR_IR)) { |
01235180 | 386 | case 0: |
f7bc74e1 | 387 | *vsid = VSID_REAL | esid; |
01235180 AG |
388 | break; |
389 | case MSR_IR: | |
f7bc74e1 | 390 | *vsid = VSID_REAL_IR | gvsid; |
01235180 AG |
391 | break; |
392 | case MSR_DR: | |
f7bc74e1 | 393 | *vsid = VSID_REAL_DR | gvsid; |
01235180 AG |
394 | break; |
395 | case MSR_DR|MSR_IR: | |
8e865178 AG |
396 | if (sr_valid(sr)) |
397 | *vsid = sr_vsid(sr); | |
4d29bdbf AG |
398 | else |
399 | *vsid = VSID_BAT | gvsid; | |
01235180 | 400 | break; |
01235180 AG |
401 | default: |
402 | BUG(); | |
403 | } | |
404 | ||
5deb8e7a | 405 | if (msr & MSR_PR) |
4b389ca2 AG |
406 | *vsid |= VSID_PR; |
407 | ||
01235180 AG |
408 | return 0; |
409 | } | |
410 | ||
411 | static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) | |
412 | { | |
413 | return true; | |
414 | } | |
415 | ||
416 | ||
417 | void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) | |
418 | { | |
419 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; | |
420 | ||
421 | mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; | |
422 | mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; | |
423 | mmu->xlate = kvmppc_mmu_book3s_32_xlate; | |
424 | mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; | |
425 | mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; | |
426 | mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; | |
427 | mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; | |
428 | mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; | |
429 | ||
430 | mmu->slbmte = NULL; | |
431 | mmu->slbmfee = NULL; | |
432 | mmu->slbmfev = NULL; | |
433 | mmu->slbie = NULL; | |
434 | mmu->slbia = NULL; | |
435 | } |