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bbf45ba5 HB |
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 IBM Corp. 2007 | |
16 | * | |
17 | * Authors: Hollis Blanchard <hollisb@us.ibm.com> | |
18 | * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> | |
19 | */ | |
20 | ||
21 | #include <linux/errno.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/fs.h> | |
27 | #include <asm/cputable.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/kvm_ppc.h> | |
83aae4a8 | 30 | #include <asm/tlbflush.h> |
fad7b9b5 | 31 | #include "../mm/mmu_decl.h" |
bbf45ba5 HB |
32 | |
33 | ||
34 | gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) | |
35 | { | |
36 | return gfn; | |
37 | } | |
38 | ||
39 | int kvm_cpu_has_interrupt(struct kvm_vcpu *v) | |
40 | { | |
45c5eb67 | 41 | return !!(v->arch.pending_exceptions); |
bbf45ba5 HB |
42 | } |
43 | ||
44 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) | |
45 | { | |
45c5eb67 | 46 | return !(v->arch.msr & MSR_WE); |
bbf45ba5 HB |
47 | } |
48 | ||
49 | ||
50 | int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu) | |
51 | { | |
52 | enum emulation_result er; | |
53 | int r; | |
54 | ||
55 | er = kvmppc_emulate_instruction(run, vcpu); | |
56 | switch (er) { | |
57 | case EMULATE_DONE: | |
58 | /* Future optimization: only reload non-volatiles if they were | |
59 | * actually modified. */ | |
60 | r = RESUME_GUEST_NV; | |
61 | break; | |
62 | case EMULATE_DO_MMIO: | |
63 | run->exit_reason = KVM_EXIT_MMIO; | |
64 | /* We must reload nonvolatiles because "update" load/store | |
65 | * instructions modify register state. */ | |
66 | /* Future optimization: only reload non-volatiles if they were | |
67 | * actually modified. */ | |
68 | r = RESUME_HOST_NV; | |
69 | break; | |
70 | case EMULATE_FAIL: | |
71 | /* XXX Deliver Program interrupt to guest. */ | |
72 | printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__, | |
73 | vcpu->arch.last_inst); | |
74 | r = RESUME_HOST; | |
75 | break; | |
76 | default: | |
77 | BUG(); | |
78 | } | |
79 | ||
80 | return r; | |
81 | } | |
82 | ||
83 | void kvm_arch_hardware_enable(void *garbage) | |
84 | { | |
85 | } | |
86 | ||
87 | void kvm_arch_hardware_disable(void *garbage) | |
88 | { | |
89 | } | |
90 | ||
91 | int kvm_arch_hardware_setup(void) | |
92 | { | |
93 | return 0; | |
94 | } | |
95 | ||
96 | void kvm_arch_hardware_unsetup(void) | |
97 | { | |
98 | } | |
99 | ||
100 | void kvm_arch_check_processor_compat(void *rtn) | |
101 | { | |
102 | int r; | |
103 | ||
104 | if (strcmp(cur_cpu_spec->platform, "ppc440") == 0) | |
105 | r = 0; | |
106 | else | |
107 | r = -ENOTSUPP; | |
108 | ||
109 | *(int *)rtn = r; | |
110 | } | |
111 | ||
112 | struct kvm *kvm_arch_create_vm(void) | |
113 | { | |
114 | struct kvm *kvm; | |
115 | ||
116 | kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); | |
117 | if (!kvm) | |
118 | return ERR_PTR(-ENOMEM); | |
119 | ||
120 | return kvm; | |
121 | } | |
122 | ||
123 | static void kvmppc_free_vcpus(struct kvm *kvm) | |
124 | { | |
125 | unsigned int i; | |
126 | ||
127 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
128 | if (kvm->vcpus[i]) { | |
129 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
130 | kvm->vcpus[i] = NULL; | |
131 | } | |
132 | } | |
133 | } | |
134 | ||
135 | void kvm_arch_destroy_vm(struct kvm *kvm) | |
136 | { | |
137 | kvmppc_free_vcpus(kvm); | |
138 | kvm_free_physmem(kvm); | |
139 | kfree(kvm); | |
140 | } | |
141 | ||
142 | int kvm_dev_ioctl_check_extension(long ext) | |
143 | { | |
144 | int r; | |
145 | ||
146 | switch (ext) { | |
147 | case KVM_CAP_USER_MEMORY: | |
148 | r = 1; | |
149 | break; | |
588968b6 LV |
150 | case KVM_CAP_COALESCED_MMIO: |
151 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
152 | break; | |
bbf45ba5 HB |
153 | default: |
154 | r = 0; | |
155 | break; | |
156 | } | |
157 | return r; | |
158 | ||
159 | } | |
160 | ||
161 | long kvm_arch_dev_ioctl(struct file *filp, | |
162 | unsigned int ioctl, unsigned long arg) | |
163 | { | |
164 | return -EINVAL; | |
165 | } | |
166 | ||
167 | int kvm_arch_set_memory_region(struct kvm *kvm, | |
168 | struct kvm_userspace_memory_region *mem, | |
169 | struct kvm_memory_slot old, | |
170 | int user_alloc) | |
171 | { | |
172 | return 0; | |
173 | } | |
174 | ||
34d4cb8f MT |
175 | void kvm_arch_flush_shadow(struct kvm *kvm) |
176 | { | |
177 | } | |
178 | ||
bbf45ba5 HB |
179 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) |
180 | { | |
181 | struct kvm_vcpu *vcpu; | |
182 | int err; | |
183 | ||
184 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
185 | if (!vcpu) { | |
186 | err = -ENOMEM; | |
187 | goto out; | |
188 | } | |
189 | ||
190 | err = kvm_vcpu_init(vcpu, kvm, id); | |
191 | if (err) | |
192 | goto free_vcpu; | |
193 | ||
194 | return vcpu; | |
195 | ||
196 | free_vcpu: | |
197 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
198 | out: | |
199 | return ERR_PTR(err); | |
200 | } | |
201 | ||
202 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
203 | { | |
204 | kvm_vcpu_uninit(vcpu); | |
205 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
206 | } | |
207 | ||
208 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
209 | { | |
210 | kvm_arch_vcpu_free(vcpu); | |
211 | } | |
212 | ||
213 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
214 | { | |
215 | unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER]; | |
216 | ||
217 | return test_bit(priority, &vcpu->arch.pending_exceptions); | |
218 | } | |
219 | ||
220 | static void kvmppc_decrementer_func(unsigned long data) | |
221 | { | |
222 | struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; | |
223 | ||
224 | kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER); | |
45c5eb67 HB |
225 | |
226 | if (waitqueue_active(&vcpu->wq)) { | |
227 | wake_up_interruptible(&vcpu->wq); | |
228 | vcpu->stat.halt_wakeup++; | |
229 | } | |
bbf45ba5 HB |
230 | } |
231 | ||
232 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
233 | { | |
234 | setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func, | |
235 | (unsigned long)vcpu); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
241 | { | |
c30f8a6c | 242 | kvmppc_core_destroy_mmu(vcpu); |
bbf45ba5 HB |
243 | } |
244 | ||
6a0ab738 HB |
245 | /* Note: clearing MSR[DE] just means that the debug interrupt will not be |
246 | * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits. | |
247 | * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt | |
248 | * will be delivered as an "imprecise debug event" (which is indicated by | |
249 | * DBSR[IDE]. | |
250 | */ | |
251 | static void kvmppc_disable_debug_interrupts(void) | |
252 | { | |
253 | mtmsr(mfmsr() & ~MSR_DE); | |
254 | } | |
255 | ||
256 | static void kvmppc_restore_host_debug_state(struct kvm_vcpu *vcpu) | |
257 | { | |
258 | kvmppc_disable_debug_interrupts(); | |
259 | ||
260 | mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]); | |
261 | mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]); | |
262 | mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]); | |
263 | mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]); | |
264 | mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1); | |
265 | mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2); | |
266 | mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0); | |
267 | mtmsr(vcpu->arch.host_msr); | |
268 | } | |
269 | ||
270 | static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu) | |
271 | { | |
272 | struct kvm_guest_debug *dbg = &vcpu->guest_debug; | |
273 | u32 dbcr0 = 0; | |
274 | ||
275 | vcpu->arch.host_msr = mfmsr(); | |
276 | kvmppc_disable_debug_interrupts(); | |
277 | ||
278 | /* Save host debug register state. */ | |
279 | vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1); | |
280 | vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2); | |
281 | vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3); | |
282 | vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4); | |
283 | vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0); | |
284 | vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1); | |
285 | vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2); | |
286 | ||
287 | /* set registers up for guest */ | |
288 | ||
289 | if (dbg->bp[0]) { | |
290 | mtspr(SPRN_IAC1, dbg->bp[0]); | |
291 | dbcr0 |= DBCR0_IAC1 | DBCR0_IDM; | |
292 | } | |
293 | if (dbg->bp[1]) { | |
294 | mtspr(SPRN_IAC2, dbg->bp[1]); | |
295 | dbcr0 |= DBCR0_IAC2 | DBCR0_IDM; | |
296 | } | |
297 | if (dbg->bp[2]) { | |
298 | mtspr(SPRN_IAC3, dbg->bp[2]); | |
299 | dbcr0 |= DBCR0_IAC3 | DBCR0_IDM; | |
300 | } | |
301 | if (dbg->bp[3]) { | |
302 | mtspr(SPRN_IAC4, dbg->bp[3]); | |
303 | dbcr0 |= DBCR0_IAC4 | DBCR0_IDM; | |
304 | } | |
305 | ||
306 | mtspr(SPRN_DBCR0, dbcr0); | |
307 | mtspr(SPRN_DBCR1, 0); | |
308 | mtspr(SPRN_DBCR2, 0); | |
309 | } | |
310 | ||
bbf45ba5 HB |
311 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
312 | { | |
83aae4a8 HB |
313 | int i; |
314 | ||
6a0ab738 HB |
315 | if (vcpu->guest_debug.enabled) |
316 | kvmppc_load_guest_debug_registers(vcpu); | |
83aae4a8 HB |
317 | |
318 | /* Mark every guest entry in the shadow TLB entry modified, so that they | |
319 | * will all be reloaded on the next vcpu run (instead of being | |
320 | * demand-faulted). */ | |
321 | for (i = 0; i <= tlb_44x_hwater; i++) | |
322 | kvmppc_tlbe_set_modified(vcpu, i); | |
bbf45ba5 HB |
323 | } |
324 | ||
325 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
326 | { | |
6a0ab738 HB |
327 | if (vcpu->guest_debug.enabled) |
328 | kvmppc_restore_host_debug_state(vcpu); | |
83aae4a8 HB |
329 | |
330 | /* Don't leave guest TLB entries resident when being de-scheduled. */ | |
331 | /* XXX It would be nice to differentiate between heavyweight exit and | |
332 | * sched_out here, since we could avoid the TLB flush for heavyweight | |
333 | * exits. */ | |
2a4aca11 | 334 | _tlbil_all(); |
bbf45ba5 HB |
335 | } |
336 | ||
bbf45ba5 HB |
337 | int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, |
338 | struct kvm_debug_guest *dbg) | |
339 | { | |
6a0ab738 HB |
340 | int i; |
341 | ||
342 | vcpu->guest_debug.enabled = dbg->enabled; | |
343 | if (vcpu->guest_debug.enabled) { | |
344 | for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) { | |
345 | if (dbg->breakpoints[i].enabled) | |
346 | vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address; | |
347 | else | |
348 | vcpu->guest_debug.bp[i] = 0; | |
349 | } | |
350 | } | |
351 | ||
352 | return 0; | |
bbf45ba5 HB |
353 | } |
354 | ||
355 | static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, | |
356 | struct kvm_run *run) | |
357 | { | |
358 | u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; | |
359 | *gpr = run->dcr.data; | |
360 | } | |
361 | ||
362 | static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, | |
363 | struct kvm_run *run) | |
364 | { | |
365 | u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; | |
366 | ||
367 | if (run->mmio.len > sizeof(*gpr)) { | |
368 | printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); | |
369 | return; | |
370 | } | |
371 | ||
372 | if (vcpu->arch.mmio_is_bigendian) { | |
373 | switch (run->mmio.len) { | |
374 | case 4: *gpr = *(u32 *)run->mmio.data; break; | |
375 | case 2: *gpr = *(u16 *)run->mmio.data; break; | |
376 | case 1: *gpr = *(u8 *)run->mmio.data; break; | |
377 | } | |
378 | } else { | |
379 | /* Convert BE data from userland back to LE. */ | |
380 | switch (run->mmio.len) { | |
381 | case 4: *gpr = ld_le32((u32 *)run->mmio.data); break; | |
382 | case 2: *gpr = ld_le16((u16 *)run->mmio.data); break; | |
383 | case 1: *gpr = *(u8 *)run->mmio.data; break; | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
389 | unsigned int rt, unsigned int bytes, int is_bigendian) | |
390 | { | |
391 | if (bytes > sizeof(run->mmio.data)) { | |
392 | printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, | |
393 | run->mmio.len); | |
394 | } | |
395 | ||
396 | run->mmio.phys_addr = vcpu->arch.paddr_accessed; | |
397 | run->mmio.len = bytes; | |
398 | run->mmio.is_write = 0; | |
399 | ||
400 | vcpu->arch.io_gpr = rt; | |
401 | vcpu->arch.mmio_is_bigendian = is_bigendian; | |
402 | vcpu->mmio_needed = 1; | |
403 | vcpu->mmio_is_write = 0; | |
404 | ||
405 | return EMULATE_DO_MMIO; | |
406 | } | |
407 | ||
408 | int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, | |
409 | u32 val, unsigned int bytes, int is_bigendian) | |
410 | { | |
411 | void *data = run->mmio.data; | |
412 | ||
413 | if (bytes > sizeof(run->mmio.data)) { | |
414 | printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, | |
415 | run->mmio.len); | |
416 | } | |
417 | ||
418 | run->mmio.phys_addr = vcpu->arch.paddr_accessed; | |
419 | run->mmio.len = bytes; | |
420 | run->mmio.is_write = 1; | |
421 | vcpu->mmio_needed = 1; | |
422 | vcpu->mmio_is_write = 1; | |
423 | ||
424 | /* Store the value at the lowest bytes in 'data'. */ | |
425 | if (is_bigendian) { | |
426 | switch (bytes) { | |
427 | case 4: *(u32 *)data = val; break; | |
428 | case 2: *(u16 *)data = val; break; | |
429 | case 1: *(u8 *)data = val; break; | |
430 | } | |
431 | } else { | |
432 | /* Store LE value into 'data'. */ | |
433 | switch (bytes) { | |
434 | case 4: st_le32(data, val); break; | |
435 | case 2: st_le16(data, val); break; | |
436 | case 1: *(u8 *)data = val; break; | |
437 | } | |
438 | } | |
439 | ||
440 | return EMULATE_DO_MMIO; | |
441 | } | |
442 | ||
443 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
444 | { | |
445 | int r; | |
446 | sigset_t sigsaved; | |
447 | ||
45c5eb67 HB |
448 | vcpu_load(vcpu); |
449 | ||
bbf45ba5 HB |
450 | if (vcpu->sigset_active) |
451 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
452 | ||
453 | if (vcpu->mmio_needed) { | |
454 | if (!vcpu->mmio_is_write) | |
455 | kvmppc_complete_mmio_load(vcpu, run); | |
456 | vcpu->mmio_needed = 0; | |
457 | } else if (vcpu->arch.dcr_needed) { | |
458 | if (!vcpu->arch.dcr_is_write) | |
459 | kvmppc_complete_dcr_load(vcpu, run); | |
460 | vcpu->arch.dcr_needed = 0; | |
461 | } | |
462 | ||
463 | kvmppc_check_and_deliver_interrupts(vcpu); | |
464 | ||
465 | local_irq_disable(); | |
466 | kvm_guest_enter(); | |
467 | r = __kvmppc_vcpu_run(run, vcpu); | |
468 | kvm_guest_exit(); | |
469 | local_irq_enable(); | |
470 | ||
471 | if (vcpu->sigset_active) | |
472 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
473 | ||
45c5eb67 HB |
474 | vcpu_put(vcpu); |
475 | ||
bbf45ba5 HB |
476 | return r; |
477 | } | |
478 | ||
479 | int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) | |
480 | { | |
481 | kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL); | |
45c5eb67 HB |
482 | |
483 | if (waitqueue_active(&vcpu->wq)) { | |
484 | wake_up_interruptible(&vcpu->wq); | |
485 | vcpu->stat.halt_wakeup++; | |
486 | } | |
487 | ||
bbf45ba5 HB |
488 | return 0; |
489 | } | |
490 | ||
491 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
492 | struct kvm_mp_state *mp_state) | |
493 | { | |
494 | return -EINVAL; | |
495 | } | |
496 | ||
497 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
498 | struct kvm_mp_state *mp_state) | |
499 | { | |
500 | return -EINVAL; | |
501 | } | |
502 | ||
503 | long kvm_arch_vcpu_ioctl(struct file *filp, | |
504 | unsigned int ioctl, unsigned long arg) | |
505 | { | |
506 | struct kvm_vcpu *vcpu = filp->private_data; | |
507 | void __user *argp = (void __user *)arg; | |
508 | long r; | |
509 | ||
510 | switch (ioctl) { | |
511 | case KVM_INTERRUPT: { | |
512 | struct kvm_interrupt irq; | |
513 | r = -EFAULT; | |
514 | if (copy_from_user(&irq, argp, sizeof(irq))) | |
515 | goto out; | |
516 | r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); | |
517 | break; | |
518 | } | |
519 | default: | |
520 | r = -EINVAL; | |
521 | } | |
522 | ||
523 | out: | |
524 | return r; | |
525 | } | |
526 | ||
527 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
528 | { | |
529 | return -ENOTSUPP; | |
530 | } | |
531 | ||
532 | long kvm_arch_vm_ioctl(struct file *filp, | |
533 | unsigned int ioctl, unsigned long arg) | |
534 | { | |
535 | long r; | |
536 | ||
537 | switch (ioctl) { | |
538 | default: | |
539 | r = -EINVAL; | |
540 | } | |
541 | ||
542 | return r; | |
543 | } | |
544 | ||
545 | int kvm_arch_init(void *opaque) | |
546 | { | |
547 | return 0; | |
548 | } | |
549 | ||
550 | void kvm_arch_exit(void) | |
551 | { | |
552 | } |