2822c8ccfaaf3ae036d6ce8da0fc16b4cf7c12a7
[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_destroy_vm(struct kvm *kvm)
129 {
130         kvmppc_free_vcpus(kvm);
131         kvm_free_physmem(kvm);
132         kfree(kvm);
133 }
134
135 int kvm_dev_ioctl_check_extension(long ext)
136 {
137         int r;
138
139         switch (ext) {
140         case KVM_CAP_COALESCED_MMIO:
141                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
142                 break;
143         default:
144                 r = 0;
145                 break;
146         }
147         return r;
148
149 }
150
151 long kvm_arch_dev_ioctl(struct file *filp,
152                         unsigned int ioctl, unsigned long arg)
153 {
154         return -EINVAL;
155 }
156
157 int kvm_arch_set_memory_region(struct kvm *kvm,
158                                struct kvm_userspace_memory_region *mem,
159                                struct kvm_memory_slot old,
160                                int user_alloc)
161 {
162         return 0;
163 }
164
165 void kvm_arch_flush_shadow(struct kvm *kvm)
166 {
167 }
168
169 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
170 {
171         struct kvm_vcpu *vcpu;
172         vcpu = kvmppc_core_vcpu_create(kvm, id);
173         kvmppc_create_vcpu_debugfs(vcpu, id);
174         return vcpu;
175 }
176
177 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
178 {
179         kvmppc_remove_vcpu_debugfs(vcpu);
180         kvmppc_core_vcpu_free(vcpu);
181 }
182
183 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
184 {
185         kvm_arch_vcpu_free(vcpu);
186 }
187
188 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
189 {
190         return kvmppc_core_pending_dec(vcpu);
191 }
192
193 static void kvmppc_decrementer_func(unsigned long data)
194 {
195         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
196
197         kvmppc_core_queue_dec(vcpu);
198
199         if (waitqueue_active(&vcpu->wq)) {
200                 wake_up_interruptible(&vcpu->wq);
201                 vcpu->stat.halt_wakeup++;
202         }
203 }
204
205 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
206 {
207         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
208                     (unsigned long)vcpu);
209
210         return 0;
211 }
212
213 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
214 {
215         kvmppc_core_destroy_mmu(vcpu);
216 }
217
218 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
219 {
220         if (vcpu->guest_debug.enabled)
221                 kvmppc_core_load_guest_debugstate(vcpu);
222
223         kvmppc_core_vcpu_load(vcpu, cpu);
224 }
225
226 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
227 {
228         if (vcpu->guest_debug.enabled)
229                 kvmppc_core_load_host_debugstate(vcpu);
230
231         /* Don't leave guest TLB entries resident when being de-scheduled. */
232         /* XXX It would be nice to differentiate between heavyweight exit and
233          * sched_out here, since we could avoid the TLB flush for heavyweight
234          * exits. */
235         _tlbil_all();
236         kvmppc_core_vcpu_put(vcpu);
237 }
238
239 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
240                                     struct kvm_debug_guest *dbg)
241 {
242         int i;
243
244         vcpu->guest_debug.enabled = dbg->enabled;
245         if (vcpu->guest_debug.enabled) {
246                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
247                         if (dbg->breakpoints[i].enabled)
248                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
249                         else
250                                 vcpu->guest_debug.bp[i] = 0;
251                 }
252         }
253
254         return 0;
255 }
256
257 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
258                                      struct kvm_run *run)
259 {
260         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
261         *gpr = run->dcr.data;
262 }
263
264 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
265                                       struct kvm_run *run)
266 {
267         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
268
269         if (run->mmio.len > sizeof(*gpr)) {
270                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
271                 return;
272         }
273
274         if (vcpu->arch.mmio_is_bigendian) {
275                 switch (run->mmio.len) {
276                 case 4: *gpr = *(u32 *)run->mmio.data; break;
277                 case 2: *gpr = *(u16 *)run->mmio.data; break;
278                 case 1: *gpr = *(u8 *)run->mmio.data; break;
279                 }
280         } else {
281                 /* Convert BE data from userland back to LE. */
282                 switch (run->mmio.len) {
283                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
284                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
285                 case 1: *gpr = *(u8 *)run->mmio.data; break;
286                 }
287         }
288 }
289
290 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
291                        unsigned int rt, unsigned int bytes, int is_bigendian)
292 {
293         if (bytes > sizeof(run->mmio.data)) {
294                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
295                        run->mmio.len);
296         }
297
298         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
299         run->mmio.len = bytes;
300         run->mmio.is_write = 0;
301
302         vcpu->arch.io_gpr = rt;
303         vcpu->arch.mmio_is_bigendian = is_bigendian;
304         vcpu->mmio_needed = 1;
305         vcpu->mmio_is_write = 0;
306
307         return EMULATE_DO_MMIO;
308 }
309
310 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
311                         u32 val, unsigned int bytes, int is_bigendian)
312 {
313         void *data = run->mmio.data;
314
315         if (bytes > sizeof(run->mmio.data)) {
316                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
317                        run->mmio.len);
318         }
319
320         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
321         run->mmio.len = bytes;
322         run->mmio.is_write = 1;
323         vcpu->mmio_needed = 1;
324         vcpu->mmio_is_write = 1;
325
326         /* Store the value at the lowest bytes in 'data'. */
327         if (is_bigendian) {
328                 switch (bytes) {
329                 case 4: *(u32 *)data = val; break;
330                 case 2: *(u16 *)data = val; break;
331                 case 1: *(u8  *)data = val; break;
332                 }
333         } else {
334                 /* Store LE value into 'data'. */
335                 switch (bytes) {
336                 case 4: st_le32(data, val); break;
337                 case 2: st_le16(data, val); break;
338                 case 1: *(u8 *)data = val; break;
339                 }
340         }
341
342         return EMULATE_DO_MMIO;
343 }
344
345 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
346 {
347         int r;
348         sigset_t sigsaved;
349
350         vcpu_load(vcpu);
351
352         if (vcpu->sigset_active)
353                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
354
355         if (vcpu->mmio_needed) {
356                 if (!vcpu->mmio_is_write)
357                         kvmppc_complete_mmio_load(vcpu, run);
358                 vcpu->mmio_needed = 0;
359         } else if (vcpu->arch.dcr_needed) {
360                 if (!vcpu->arch.dcr_is_write)
361                         kvmppc_complete_dcr_load(vcpu, run);
362                 vcpu->arch.dcr_needed = 0;
363         }
364
365         kvmppc_core_deliver_interrupts(vcpu);
366
367         local_irq_disable();
368         kvm_guest_enter();
369         r = __kvmppc_vcpu_run(run, vcpu);
370         kvm_guest_exit();
371         local_irq_enable();
372
373         if (vcpu->sigset_active)
374                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
375
376         vcpu_put(vcpu);
377
378         return r;
379 }
380
381 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
382 {
383         kvmppc_core_queue_external(vcpu, irq);
384
385         if (waitqueue_active(&vcpu->wq)) {
386                 wake_up_interruptible(&vcpu->wq);
387                 vcpu->stat.halt_wakeup++;
388         }
389
390         return 0;
391 }
392
393 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
394                                     struct kvm_mp_state *mp_state)
395 {
396         return -EINVAL;
397 }
398
399 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
400                                     struct kvm_mp_state *mp_state)
401 {
402         return -EINVAL;
403 }
404
405 long kvm_arch_vcpu_ioctl(struct file *filp,
406                          unsigned int ioctl, unsigned long arg)
407 {
408         struct kvm_vcpu *vcpu = filp->private_data;
409         void __user *argp = (void __user *)arg;
410         long r;
411
412         switch (ioctl) {
413         case KVM_INTERRUPT: {
414                 struct kvm_interrupt irq;
415                 r = -EFAULT;
416                 if (copy_from_user(&irq, argp, sizeof(irq)))
417                         goto out;
418                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
419                 break;
420         }
421         default:
422                 r = -EINVAL;
423         }
424
425 out:
426         return r;
427 }
428
429 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
430 {
431         return -ENOTSUPP;
432 }
433
434 long kvm_arch_vm_ioctl(struct file *filp,
435                        unsigned int ioctl, unsigned long arg)
436 {
437         long r;
438
439         switch (ioctl) {
440         default:
441                 r = -EINVAL;
442         }
443
444         return r;
445 }
446
447 int kvm_arch_init(void *opaque)
448 {
449         return 0;
450 }
451
452 void kvm_arch_exit(void)
453 {
454 }