CONFIG_FILE_LOCKING should not depend on CONFIG_BLOCK
[sfrench/cifs-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_interrupt_allowed(struct kvm_vcpu *vcpu)
45 {
46         /* do real check here */
47         return 1;
48 }
49
50 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
51 {
52         return !(v->arch.msr & MSR_WE);
53 }
54
55
56 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
57 {
58         enum emulation_result er;
59         int r;
60
61         er = kvmppc_emulate_instruction(run, vcpu);
62         switch (er) {
63         case EMULATE_DONE:
64                 /* Future optimization: only reload non-volatiles if they were
65                  * actually modified. */
66                 r = RESUME_GUEST_NV;
67                 break;
68         case EMULATE_DO_MMIO:
69                 run->exit_reason = KVM_EXIT_MMIO;
70                 /* We must reload nonvolatiles because "update" load/store
71                  * instructions modify register state. */
72                 /* Future optimization: only reload non-volatiles if they were
73                  * actually modified. */
74                 r = RESUME_HOST_NV;
75                 break;
76         case EMULATE_FAIL:
77                 /* XXX Deliver Program interrupt to guest. */
78                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
79                        vcpu->arch.last_inst);
80                 r = RESUME_HOST;
81                 break;
82         default:
83                 BUG();
84         }
85
86         return r;
87 }
88
89 void kvm_arch_hardware_enable(void *garbage)
90 {
91 }
92
93 void kvm_arch_hardware_disable(void *garbage)
94 {
95 }
96
97 int kvm_arch_hardware_setup(void)
98 {
99         return 0;
100 }
101
102 void kvm_arch_hardware_unsetup(void)
103 {
104 }
105
106 void kvm_arch_check_processor_compat(void *rtn)
107 {
108         *(int *)rtn = kvmppc_core_check_processor_compat();
109 }
110
111 struct kvm *kvm_arch_create_vm(void)
112 {
113         struct kvm *kvm;
114
115         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
116         if (!kvm)
117                 return ERR_PTR(-ENOMEM);
118
119         return kvm;
120 }
121
122 static void kvmppc_free_vcpus(struct kvm *kvm)
123 {
124         unsigned int i;
125
126         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
127                 if (kvm->vcpus[i]) {
128                         kvm_arch_vcpu_free(kvm->vcpus[i]);
129                         kvm->vcpus[i] = NULL;
130                 }
131         }
132 }
133
134 void kvm_arch_sync_events(struct kvm *kvm)
135 {
136 }
137
138 void kvm_arch_destroy_vm(struct kvm *kvm)
139 {
140         kvmppc_free_vcpus(kvm);
141         kvm_free_physmem(kvm);
142         kfree(kvm);
143 }
144
145 int kvm_dev_ioctl_check_extension(long ext)
146 {
147         int r;
148
149         switch (ext) {
150         case KVM_CAP_COALESCED_MMIO:
151                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
152                 break;
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
175 void kvm_arch_flush_shadow(struct kvm *kvm)
176 {
177 }
178
179 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
180 {
181         struct kvm_vcpu *vcpu;
182         vcpu = kvmppc_core_vcpu_create(kvm, id);
183         kvmppc_create_vcpu_debugfs(vcpu, id);
184         return vcpu;
185 }
186
187 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
188 {
189         kvmppc_remove_vcpu_debugfs(vcpu);
190         kvmppc_core_vcpu_free(vcpu);
191 }
192
193 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
194 {
195         kvm_arch_vcpu_free(vcpu);
196 }
197
198 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
199 {
200         return kvmppc_core_pending_dec(vcpu);
201 }
202
203 static void kvmppc_decrementer_func(unsigned long data)
204 {
205         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
206
207         kvmppc_core_queue_dec(vcpu);
208
209         if (waitqueue_active(&vcpu->wq)) {
210                 wake_up_interruptible(&vcpu->wq);
211                 vcpu->stat.halt_wakeup++;
212         }
213 }
214
215 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
216 {
217         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
218                     (unsigned long)vcpu);
219
220         return 0;
221 }
222
223 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
224 {
225         kvmppc_mmu_destroy(vcpu);
226 }
227
228 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
229 {
230         kvmppc_core_vcpu_load(vcpu, cpu);
231 }
232
233 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
234 {
235         kvmppc_core_vcpu_put(vcpu);
236 }
237
238 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
239                                         struct kvm_guest_debug *dbg)
240 {
241         return -EINVAL;
242 }
243
244 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
245                                      struct kvm_run *run)
246 {
247         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
248         *gpr = run->dcr.data;
249 }
250
251 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
252                                       struct kvm_run *run)
253 {
254         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
255
256         if (run->mmio.len > sizeof(*gpr)) {
257                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
258                 return;
259         }
260
261         if (vcpu->arch.mmio_is_bigendian) {
262                 switch (run->mmio.len) {
263                 case 4: *gpr = *(u32 *)run->mmio.data; break;
264                 case 2: *gpr = *(u16 *)run->mmio.data; break;
265                 case 1: *gpr = *(u8 *)run->mmio.data; break;
266                 }
267         } else {
268                 /* Convert BE data from userland back to LE. */
269                 switch (run->mmio.len) {
270                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
271                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
272                 case 1: *gpr = *(u8 *)run->mmio.data; break;
273                 }
274         }
275 }
276
277 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
278                        unsigned int rt, unsigned int bytes, int is_bigendian)
279 {
280         if (bytes > sizeof(run->mmio.data)) {
281                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
282                        run->mmio.len);
283         }
284
285         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
286         run->mmio.len = bytes;
287         run->mmio.is_write = 0;
288
289         vcpu->arch.io_gpr = rt;
290         vcpu->arch.mmio_is_bigendian = is_bigendian;
291         vcpu->mmio_needed = 1;
292         vcpu->mmio_is_write = 0;
293
294         return EMULATE_DO_MMIO;
295 }
296
297 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
298                         u32 val, unsigned int bytes, int is_bigendian)
299 {
300         void *data = run->mmio.data;
301
302         if (bytes > sizeof(run->mmio.data)) {
303                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
304                        run->mmio.len);
305         }
306
307         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
308         run->mmio.len = bytes;
309         run->mmio.is_write = 1;
310         vcpu->mmio_needed = 1;
311         vcpu->mmio_is_write = 1;
312
313         /* Store the value at the lowest bytes in 'data'. */
314         if (is_bigendian) {
315                 switch (bytes) {
316                 case 4: *(u32 *)data = val; break;
317                 case 2: *(u16 *)data = val; break;
318                 case 1: *(u8  *)data = val; break;
319                 }
320         } else {
321                 /* Store LE value into 'data'. */
322                 switch (bytes) {
323                 case 4: st_le32(data, val); break;
324                 case 2: st_le16(data, val); break;
325                 case 1: *(u8 *)data = val; break;
326                 }
327         }
328
329         return EMULATE_DO_MMIO;
330 }
331
332 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
333 {
334         int r;
335         sigset_t sigsaved;
336
337         vcpu_load(vcpu);
338
339         if (vcpu->sigset_active)
340                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
341
342         if (vcpu->mmio_needed) {
343                 if (!vcpu->mmio_is_write)
344                         kvmppc_complete_mmio_load(vcpu, run);
345                 vcpu->mmio_needed = 0;
346         } else if (vcpu->arch.dcr_needed) {
347                 if (!vcpu->arch.dcr_is_write)
348                         kvmppc_complete_dcr_load(vcpu, run);
349                 vcpu->arch.dcr_needed = 0;
350         }
351
352         kvmppc_core_deliver_interrupts(vcpu);
353
354         local_irq_disable();
355         kvm_guest_enter();
356         r = __kvmppc_vcpu_run(run, vcpu);
357         kvm_guest_exit();
358         local_irq_enable();
359
360         if (vcpu->sigset_active)
361                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
362
363         vcpu_put(vcpu);
364
365         return r;
366 }
367
368 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
369 {
370         kvmppc_core_queue_external(vcpu, irq);
371
372         if (waitqueue_active(&vcpu->wq)) {
373                 wake_up_interruptible(&vcpu->wq);
374                 vcpu->stat.halt_wakeup++;
375         }
376
377         return 0;
378 }
379
380 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
381                                     struct kvm_mp_state *mp_state)
382 {
383         return -EINVAL;
384 }
385
386 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
387                                     struct kvm_mp_state *mp_state)
388 {
389         return -EINVAL;
390 }
391
392 long kvm_arch_vcpu_ioctl(struct file *filp,
393                          unsigned int ioctl, unsigned long arg)
394 {
395         struct kvm_vcpu *vcpu = filp->private_data;
396         void __user *argp = (void __user *)arg;
397         long r;
398
399         switch (ioctl) {
400         case KVM_INTERRUPT: {
401                 struct kvm_interrupt irq;
402                 r = -EFAULT;
403                 if (copy_from_user(&irq, argp, sizeof(irq)))
404                         goto out;
405                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
406                 break;
407         }
408         default:
409                 r = -EINVAL;
410         }
411
412 out:
413         return r;
414 }
415
416 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
417 {
418         return -ENOTSUPP;
419 }
420
421 long kvm_arch_vm_ioctl(struct file *filp,
422                        unsigned int ioctl, unsigned long arg)
423 {
424         long r;
425
426         switch (ioctl) {
427         default:
428                 r = -EINVAL;
429         }
430
431         return r;
432 }
433
434 int kvm_arch_init(void *opaque)
435 {
436         return 0;
437 }
438
439 void kvm_arch_exit(void)
440 {
441 }