KVM: Add kvm_arch_sync_events to sync with asynchronize events
[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/fs.h>
27 #include <asm/cputable.h>
28 #include <asm/uaccess.h>
29 #include <asm/kvm_ppc.h>
30 #include <asm/tlbflush.h>
31 #include "timing.h"
32 #include "../mm/mmu_decl.h"
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 {
41         return !!(v->arch.pending_exceptions);
42 }
43
44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
45 {
46         return !(v->arch.msr & MSR_WE);
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 *)rtn = kvmppc_core_check_processor_compat();
103 }
104
105 struct kvm *kvm_arch_create_vm(void)
106 {
107         struct kvm *kvm;
108
109         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
110         if (!kvm)
111                 return ERR_PTR(-ENOMEM);
112
113         return kvm;
114 }
115
116 static void kvmppc_free_vcpus(struct kvm *kvm)
117 {
118         unsigned int i;
119
120         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
121                 if (kvm->vcpus[i]) {
122                         kvm_arch_vcpu_free(kvm->vcpus[i]);
123                         kvm->vcpus[i] = NULL;
124                 }
125         }
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         kfree(kvm);
137 }
138
139 int kvm_dev_ioctl_check_extension(long ext)
140 {
141         int r;
142
143         switch (ext) {
144         case KVM_CAP_COALESCED_MMIO:
145                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
146                 break;
147         default:
148                 r = 0;
149                 break;
150         }
151         return r;
152
153 }
154
155 long kvm_arch_dev_ioctl(struct file *filp,
156                         unsigned int ioctl, unsigned long arg)
157 {
158         return -EINVAL;
159 }
160
161 int kvm_arch_set_memory_region(struct kvm *kvm,
162                                struct kvm_userspace_memory_region *mem,
163                                struct kvm_memory_slot old,
164                                int user_alloc)
165 {
166         return 0;
167 }
168
169 void kvm_arch_flush_shadow(struct kvm *kvm)
170 {
171 }
172
173 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
174 {
175         struct kvm_vcpu *vcpu;
176         vcpu = kvmppc_core_vcpu_create(kvm, id);
177         kvmppc_create_vcpu_debugfs(vcpu, id);
178         return vcpu;
179 }
180
181 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
182 {
183         kvmppc_remove_vcpu_debugfs(vcpu);
184         kvmppc_core_vcpu_free(vcpu);
185 }
186
187 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
188 {
189         kvm_arch_vcpu_free(vcpu);
190 }
191
192 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
193 {
194         return kvmppc_core_pending_dec(vcpu);
195 }
196
197 static void kvmppc_decrementer_func(unsigned long data)
198 {
199         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
200
201         kvmppc_core_queue_dec(vcpu);
202
203         if (waitqueue_active(&vcpu->wq)) {
204                 wake_up_interruptible(&vcpu->wq);
205                 vcpu->stat.halt_wakeup++;
206         }
207 }
208
209 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
210 {
211         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
212                     (unsigned long)vcpu);
213
214         return 0;
215 }
216
217 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
218 {
219         kvmppc_core_destroy_mmu(vcpu);
220 }
221
222 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
223 {
224         if (vcpu->guest_debug.enabled)
225                 kvmppc_core_load_guest_debugstate(vcpu);
226
227         kvmppc_core_vcpu_load(vcpu, cpu);
228 }
229
230 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
231 {
232         if (vcpu->guest_debug.enabled)
233                 kvmppc_core_load_host_debugstate(vcpu);
234
235         /* Don't leave guest TLB entries resident when being de-scheduled. */
236         /* XXX It would be nice to differentiate between heavyweight exit and
237          * sched_out here, since we could avoid the TLB flush for heavyweight
238          * exits. */
239         _tlbil_all();
240         kvmppc_core_vcpu_put(vcpu);
241 }
242
243 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
244                                     struct kvm_debug_guest *dbg)
245 {
246         int i;
247
248         vcpu->guest_debug.enabled = dbg->enabled;
249         if (vcpu->guest_debug.enabled) {
250                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
251                         if (dbg->breakpoints[i].enabled)
252                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
253                         else
254                                 vcpu->guest_debug.bp[i] = 0;
255                 }
256         }
257
258         return 0;
259 }
260
261 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
262                                      struct kvm_run *run)
263 {
264         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
265         *gpr = run->dcr.data;
266 }
267
268 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
269                                       struct kvm_run *run)
270 {
271         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
272
273         if (run->mmio.len > sizeof(*gpr)) {
274                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
275                 return;
276         }
277
278         if (vcpu->arch.mmio_is_bigendian) {
279                 switch (run->mmio.len) {
280                 case 4: *gpr = *(u32 *)run->mmio.data; break;
281                 case 2: *gpr = *(u16 *)run->mmio.data; break;
282                 case 1: *gpr = *(u8 *)run->mmio.data; break;
283                 }
284         } else {
285                 /* Convert BE data from userland back to LE. */
286                 switch (run->mmio.len) {
287                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
288                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
289                 case 1: *gpr = *(u8 *)run->mmio.data; break;
290                 }
291         }
292 }
293
294 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
295                        unsigned int rt, unsigned int bytes, int is_bigendian)
296 {
297         if (bytes > sizeof(run->mmio.data)) {
298                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
299                        run->mmio.len);
300         }
301
302         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
303         run->mmio.len = bytes;
304         run->mmio.is_write = 0;
305
306         vcpu->arch.io_gpr = rt;
307         vcpu->arch.mmio_is_bigendian = is_bigendian;
308         vcpu->mmio_needed = 1;
309         vcpu->mmio_is_write = 0;
310
311         return EMULATE_DO_MMIO;
312 }
313
314 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
315                         u32 val, unsigned int bytes, int is_bigendian)
316 {
317         void *data = run->mmio.data;
318
319         if (bytes > sizeof(run->mmio.data)) {
320                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
321                        run->mmio.len);
322         }
323
324         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
325         run->mmio.len = bytes;
326         run->mmio.is_write = 1;
327         vcpu->mmio_needed = 1;
328         vcpu->mmio_is_write = 1;
329
330         /* Store the value at the lowest bytes in 'data'. */
331         if (is_bigendian) {
332                 switch (bytes) {
333                 case 4: *(u32 *)data = val; break;
334                 case 2: *(u16 *)data = val; break;
335                 case 1: *(u8  *)data = val; break;
336                 }
337         } else {
338                 /* Store LE value into 'data'. */
339                 switch (bytes) {
340                 case 4: st_le32(data, val); break;
341                 case 2: st_le16(data, val); break;
342                 case 1: *(u8 *)data = val; break;
343                 }
344         }
345
346         return EMULATE_DO_MMIO;
347 }
348
349 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
350 {
351         int r;
352         sigset_t sigsaved;
353
354         vcpu_load(vcpu);
355
356         if (vcpu->sigset_active)
357                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
358
359         if (vcpu->mmio_needed) {
360                 if (!vcpu->mmio_is_write)
361                         kvmppc_complete_mmio_load(vcpu, run);
362                 vcpu->mmio_needed = 0;
363         } else if (vcpu->arch.dcr_needed) {
364                 if (!vcpu->arch.dcr_is_write)
365                         kvmppc_complete_dcr_load(vcpu, run);
366                 vcpu->arch.dcr_needed = 0;
367         }
368
369         kvmppc_core_deliver_interrupts(vcpu);
370
371         local_irq_disable();
372         kvm_guest_enter();
373         r = __kvmppc_vcpu_run(run, vcpu);
374         kvm_guest_exit();
375         local_irq_enable();
376
377         if (vcpu->sigset_active)
378                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
379
380         vcpu_put(vcpu);
381
382         return r;
383 }
384
385 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
386 {
387         kvmppc_core_queue_external(vcpu, irq);
388
389         if (waitqueue_active(&vcpu->wq)) {
390                 wake_up_interruptible(&vcpu->wq);
391                 vcpu->stat.halt_wakeup++;
392         }
393
394         return 0;
395 }
396
397 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
398                                     struct kvm_mp_state *mp_state)
399 {
400         return -EINVAL;
401 }
402
403 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
404                                     struct kvm_mp_state *mp_state)
405 {
406         return -EINVAL;
407 }
408
409 long kvm_arch_vcpu_ioctl(struct file *filp,
410                          unsigned int ioctl, unsigned long arg)
411 {
412         struct kvm_vcpu *vcpu = filp->private_data;
413         void __user *argp = (void __user *)arg;
414         long r;
415
416         switch (ioctl) {
417         case KVM_INTERRUPT: {
418                 struct kvm_interrupt irq;
419                 r = -EFAULT;
420                 if (copy_from_user(&irq, argp, sizeof(irq)))
421                         goto out;
422                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
423                 break;
424         }
425         default:
426                 r = -EINVAL;
427         }
428
429 out:
430         return r;
431 }
432
433 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
434 {
435         return -ENOTSUPP;
436 }
437
438 long kvm_arch_vm_ioctl(struct file *filp,
439                        unsigned int ioctl, unsigned long arg)
440 {
441         long r;
442
443         switch (ioctl) {
444         default:
445                 r = -EINVAL;
446         }
447
448         return r;
449 }
450
451 int kvm_arch_init(void *opaque)
452 {
453         return 0;
454 }
455
456 void kvm_arch_exit(void)
457 {
458 }