KVM: Remove memory alias support
[linux-2.6.git] / arch / powerpc / kvm / powerpc.c
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/hrtimer.h>
27 #include <linux/fs.h>
28 #include <linux/slab.h>
29 #include <asm/cputable.h>
30 #include <asm/uaccess.h>
31 #include <asm/kvm_ppc.h>
32 #include <asm/tlbflush.h>
33 #include "timing.h"
34 #include "../mm/mmu_decl.h"
35
36 #define CREATE_TRACE_POINTS
37 #include "trace.h"
38
39 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
40 {
41         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
42 }
43
44
45 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
46 {
47         enum emulation_result er;
48         int r;
49
50         er = kvmppc_emulate_instruction(run, vcpu);
51         switch (er) {
52         case EMULATE_DONE:
53                 /* Future optimization: only reload non-volatiles if they were
54                  * actually modified. */
55                 r = RESUME_GUEST_NV;
56                 break;
57         case EMULATE_DO_MMIO:
58                 run->exit_reason = KVM_EXIT_MMIO;
59                 /* We must reload nonvolatiles because "update" load/store
60                  * instructions modify register state. */
61                 /* Future optimization: only reload non-volatiles if they were
62                  * actually modified. */
63                 r = RESUME_HOST_NV;
64                 break;
65         case EMULATE_FAIL:
66                 /* XXX Deliver Program interrupt to guest. */
67                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
68                        kvmppc_get_last_inst(vcpu));
69                 r = RESUME_HOST;
70                 break;
71         default:
72                 BUG();
73         }
74
75         return r;
76 }
77
78 int kvm_arch_hardware_enable(void *garbage)
79 {
80         return 0;
81 }
82
83 void kvm_arch_hardware_disable(void *garbage)
84 {
85 }
86
87 int kvm_arch_hardware_setup(void)
88 {
89         return 0;
90 }
91
92 void kvm_arch_hardware_unsetup(void)
93 {
94 }
95
96 void kvm_arch_check_processor_compat(void *rtn)
97 {
98         *(int *)rtn = kvmppc_core_check_processor_compat();
99 }
100
101 struct kvm *kvm_arch_create_vm(void)
102 {
103         struct kvm *kvm;
104
105         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
106         if (!kvm)
107                 return ERR_PTR(-ENOMEM);
108
109         return kvm;
110 }
111
112 static void kvmppc_free_vcpus(struct kvm *kvm)
113 {
114         unsigned int i;
115         struct kvm_vcpu *vcpu;
116
117         kvm_for_each_vcpu(i, vcpu, kvm)
118                 kvm_arch_vcpu_free(vcpu);
119
120         mutex_lock(&kvm->lock);
121         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
122                 kvm->vcpus[i] = NULL;
123
124         atomic_set(&kvm->online_vcpus, 0);
125         mutex_unlock(&kvm->lock);
126 }
127
128 void kvm_arch_sync_events(struct kvm *kvm)
129 {
130 }
131
132 void kvm_arch_destroy_vm(struct kvm *kvm)
133 {
134         kvmppc_free_vcpus(kvm);
135         kvm_free_physmem(kvm);
136         cleanup_srcu_struct(&kvm->srcu);
137         kfree(kvm);
138 }
139
140 int kvm_dev_ioctl_check_extension(long ext)
141 {
142         int r;
143
144         switch (ext) {
145         case KVM_CAP_PPC_SEGSTATE:
146         case KVM_CAP_PPC_PAIRED_SINGLES:
147         case KVM_CAP_PPC_UNSET_IRQ:
148         case KVM_CAP_ENABLE_CAP:
149         case KVM_CAP_PPC_OSI:
150                 r = 1;
151                 break;
152         case KVM_CAP_COALESCED_MMIO:
153                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
154                 break;
155         default:
156                 r = 0;
157                 break;
158         }
159         return r;
160
161 }
162
163 long kvm_arch_dev_ioctl(struct file *filp,
164                         unsigned int ioctl, unsigned long arg)
165 {
166         return -EINVAL;
167 }
168
169 int kvm_arch_prepare_memory_region(struct kvm *kvm,
170                                    struct kvm_memory_slot *memslot,
171                                    struct kvm_memory_slot old,
172                                    struct kvm_userspace_memory_region *mem,
173                                    int user_alloc)
174 {
175         return 0;
176 }
177
178 void kvm_arch_commit_memory_region(struct kvm *kvm,
179                struct kvm_userspace_memory_region *mem,
180                struct kvm_memory_slot old,
181                int user_alloc)
182 {
183        return;
184 }
185
186
187 void kvm_arch_flush_shadow(struct kvm *kvm)
188 {
189 }
190
191 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
192 {
193         struct kvm_vcpu *vcpu;
194         vcpu = kvmppc_core_vcpu_create(kvm, id);
195         if (!IS_ERR(vcpu))
196                 kvmppc_create_vcpu_debugfs(vcpu, id);
197         return vcpu;
198 }
199
200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
201 {
202         /* Make sure we're not using the vcpu anymore */
203         hrtimer_cancel(&vcpu->arch.dec_timer);
204         tasklet_kill(&vcpu->arch.tasklet);
205
206         kvmppc_remove_vcpu_debugfs(vcpu);
207         kvmppc_core_vcpu_free(vcpu);
208 }
209
210 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
211 {
212         kvm_arch_vcpu_free(vcpu);
213 }
214
215 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
216 {
217         return kvmppc_core_pending_dec(vcpu);
218 }
219
220 static void kvmppc_decrementer_func(unsigned long data)
221 {
222         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
223
224         kvmppc_core_queue_dec(vcpu);
225
226         if (waitqueue_active(&vcpu->wq)) {
227                 wake_up_interruptible(&vcpu->wq);
228                 vcpu->stat.halt_wakeup++;
229         }
230 }
231
232 /*
233  * low level hrtimer wake routine. Because this runs in hardirq context
234  * we schedule a tasklet to do the real work.
235  */
236 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
237 {
238         struct kvm_vcpu *vcpu;
239
240         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
241         tasklet_schedule(&vcpu->arch.tasklet);
242
243         return HRTIMER_NORESTART;
244 }
245
246 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
247 {
248         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
249         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
250         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
251
252         return 0;
253 }
254
255 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
256 {
257         kvmppc_mmu_destroy(vcpu);
258 }
259
260 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
261 {
262         kvmppc_core_vcpu_load(vcpu, cpu);
263 }
264
265 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
266 {
267         kvmppc_core_vcpu_put(vcpu);
268 }
269
270 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
271                                         struct kvm_guest_debug *dbg)
272 {
273         return -EINVAL;
274 }
275
276 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
277                                      struct kvm_run *run)
278 {
279         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
280 }
281
282 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
283                                       struct kvm_run *run)
284 {
285         u64 uninitialized_var(gpr);
286
287         if (run->mmio.len > sizeof(gpr)) {
288                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
289                 return;
290         }
291
292         if (vcpu->arch.mmio_is_bigendian) {
293                 switch (run->mmio.len) {
294                 case 8: gpr = *(u64 *)run->mmio.data; break;
295                 case 4: gpr = *(u32 *)run->mmio.data; break;
296                 case 2: gpr = *(u16 *)run->mmio.data; break;
297                 case 1: gpr = *(u8 *)run->mmio.data; break;
298                 }
299         } else {
300                 /* Convert BE data from userland back to LE. */
301                 switch (run->mmio.len) {
302                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
303                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
304                 case 1: gpr = *(u8 *)run->mmio.data; break;
305                 }
306         }
307
308         if (vcpu->arch.mmio_sign_extend) {
309                 switch (run->mmio.len) {
310 #ifdef CONFIG_PPC64
311                 case 4:
312                         gpr = (s64)(s32)gpr;
313                         break;
314 #endif
315                 case 2:
316                         gpr = (s64)(s16)gpr;
317                         break;
318                 case 1:
319                         gpr = (s64)(s8)gpr;
320                         break;
321                 }
322         }
323
324         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
325
326         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
327         case KVM_REG_GPR:
328                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
329                 break;
330         case KVM_REG_FPR:
331                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
332                 break;
333 #ifdef CONFIG_PPC_BOOK3S
334         case KVM_REG_QPR:
335                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
336                 break;
337         case KVM_REG_FQPR:
338                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
339                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
340                 break;
341 #endif
342         default:
343                 BUG();
344         }
345 }
346
347 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
348                        unsigned int rt, unsigned int bytes, int is_bigendian)
349 {
350         if (bytes > sizeof(run->mmio.data)) {
351                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
352                        run->mmio.len);
353         }
354
355         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
356         run->mmio.len = bytes;
357         run->mmio.is_write = 0;
358
359         vcpu->arch.io_gpr = rt;
360         vcpu->arch.mmio_is_bigendian = is_bigendian;
361         vcpu->mmio_needed = 1;
362         vcpu->mmio_is_write = 0;
363         vcpu->arch.mmio_sign_extend = 0;
364
365         return EMULATE_DO_MMIO;
366 }
367
368 /* Same as above, but sign extends */
369 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
370                         unsigned int rt, unsigned int bytes, int is_bigendian)
371 {
372         int r;
373
374         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
375         vcpu->arch.mmio_sign_extend = 1;
376
377         return r;
378 }
379
380 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
381                         u64 val, unsigned int bytes, int is_bigendian)
382 {
383         void *data = run->mmio.data;
384
385         if (bytes > sizeof(run->mmio.data)) {
386                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
387                        run->mmio.len);
388         }
389
390         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
391         run->mmio.len = bytes;
392         run->mmio.is_write = 1;
393         vcpu->mmio_needed = 1;
394         vcpu->mmio_is_write = 1;
395
396         /* Store the value at the lowest bytes in 'data'. */
397         if (is_bigendian) {
398                 switch (bytes) {
399                 case 8: *(u64 *)data = val; break;
400                 case 4: *(u32 *)data = val; break;
401                 case 2: *(u16 *)data = val; break;
402                 case 1: *(u8  *)data = val; break;
403                 }
404         } else {
405                 /* Store LE value into 'data'. */
406                 switch (bytes) {
407                 case 4: st_le32(data, val); break;
408                 case 2: st_le16(data, val); break;
409                 case 1: *(u8 *)data = val; break;
410                 }
411         }
412
413         return EMULATE_DO_MMIO;
414 }
415
416 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
417 {
418         int r;
419         sigset_t sigsaved;
420
421         if (vcpu->sigset_active)
422                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
423
424         if (vcpu->mmio_needed) {
425                 if (!vcpu->mmio_is_write)
426                         kvmppc_complete_mmio_load(vcpu, run);
427                 vcpu->mmio_needed = 0;
428         } else if (vcpu->arch.dcr_needed) {
429                 if (!vcpu->arch.dcr_is_write)
430                         kvmppc_complete_dcr_load(vcpu, run);
431                 vcpu->arch.dcr_needed = 0;
432         } else if (vcpu->arch.osi_needed) {
433                 u64 *gprs = run->osi.gprs;
434                 int i;
435
436                 for (i = 0; i < 32; i++)
437                         kvmppc_set_gpr(vcpu, i, gprs[i]);
438                 vcpu->arch.osi_needed = 0;
439         }
440
441         kvmppc_core_deliver_interrupts(vcpu);
442
443         local_irq_disable();
444         kvm_guest_enter();
445         r = __kvmppc_vcpu_run(run, vcpu);
446         kvm_guest_exit();
447         local_irq_enable();
448
449         if (vcpu->sigset_active)
450                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
451
452         return r;
453 }
454
455 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
456 {
457         if (irq->irq == KVM_INTERRUPT_UNSET)
458                 kvmppc_core_dequeue_external(vcpu, irq);
459         else
460                 kvmppc_core_queue_external(vcpu, irq);
461
462         if (waitqueue_active(&vcpu->wq)) {
463                 wake_up_interruptible(&vcpu->wq);
464                 vcpu->stat.halt_wakeup++;
465         }
466
467         return 0;
468 }
469
470 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
471                                      struct kvm_enable_cap *cap)
472 {
473         int r;
474
475         if (cap->flags)
476                 return -EINVAL;
477
478         switch (cap->cap) {
479         case KVM_CAP_PPC_OSI:
480                 r = 0;
481                 vcpu->arch.osi_enabled = true;
482                 break;
483         default:
484                 r = -EINVAL;
485                 break;
486         }
487
488         return r;
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                 goto out;
518         }
519
520         case KVM_ENABLE_CAP:
521         {
522                 struct kvm_enable_cap cap;
523                 r = -EFAULT;
524                 if (copy_from_user(&cap, argp, sizeof(cap)))
525                         goto out;
526                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
527                 break;
528         }
529         default:
530                 r = -EINVAL;
531         }
532
533 out:
534         return r;
535 }
536
537 long kvm_arch_vm_ioctl(struct file *filp,
538                        unsigned int ioctl, unsigned long arg)
539 {
540         long r;
541
542         switch (ioctl) {
543         default:
544                 r = -ENOTTY;
545         }
546
547         return r;
548 }
549
550 int kvm_arch_init(void *opaque)
551 {
552         return 0;
553 }
554
555 void kvm_arch_exit(void)
556 {
557 }