bad40bd2d3ac5e966926487cb10df89513e2acc6
[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
31
32 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
33 {
34         return gfn;
35 }
36
37 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
38 {
39         /* XXX implement me */
40         return 0;
41 }
42
43 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
44 {
45         return 1;
46 }
47
48
49 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
50 {
51         enum emulation_result er;
52         int r;
53
54         er = kvmppc_emulate_instruction(run, vcpu);
55         switch (er) {
56         case EMULATE_DONE:
57                 /* Future optimization: only reload non-volatiles if they were
58                  * actually modified. */
59                 r = RESUME_GUEST_NV;
60                 break;
61         case EMULATE_DO_MMIO:
62                 run->exit_reason = KVM_EXIT_MMIO;
63                 /* We must reload nonvolatiles because "update" load/store
64                  * instructions modify register state. */
65                 /* Future optimization: only reload non-volatiles if they were
66                  * actually modified. */
67                 r = RESUME_HOST_NV;
68                 break;
69         case EMULATE_FAIL:
70                 /* XXX Deliver Program interrupt to guest. */
71                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
72                        vcpu->arch.last_inst);
73                 r = RESUME_HOST;
74                 break;
75         default:
76                 BUG();
77         }
78
79         return r;
80 }
81
82 void kvm_arch_hardware_enable(void *garbage)
83 {
84 }
85
86 void kvm_arch_hardware_disable(void *garbage)
87 {
88 }
89
90 int kvm_arch_hardware_setup(void)
91 {
92         return 0;
93 }
94
95 void kvm_arch_hardware_unsetup(void)
96 {
97 }
98
99 void kvm_arch_check_processor_compat(void *rtn)
100 {
101         int r;
102
103         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
104                 r = 0;
105         else
106                 r = -ENOTSUPP;
107
108         *(int *)rtn = r;
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_destroy_vm(struct kvm *kvm)
135 {
136         kvmppc_free_vcpus(kvm);
137         kvm_free_physmem(kvm);
138         kfree(kvm);
139 }
140
141 int kvm_dev_ioctl_check_extension(long ext)
142 {
143         int r;
144
145         switch (ext) {
146         case KVM_CAP_USER_MEMORY:
147                 r = 1;
148                 break;
149         default:
150                 r = 0;
151                 break;
152         }
153         return r;
154
155 }
156
157 long kvm_arch_dev_ioctl(struct file *filp,
158                         unsigned int ioctl, unsigned long arg)
159 {
160         return -EINVAL;
161 }
162
163 int kvm_arch_set_memory_region(struct kvm *kvm,
164                                struct kvm_userspace_memory_region *mem,
165                                struct kvm_memory_slot old,
166                                int user_alloc)
167 {
168         return 0;
169 }
170
171 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
172 {
173         struct kvm_vcpu *vcpu;
174         int err;
175
176         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
177         if (!vcpu) {
178                 err = -ENOMEM;
179                 goto out;
180         }
181
182         err = kvm_vcpu_init(vcpu, kvm, id);
183         if (err)
184                 goto free_vcpu;
185
186         return vcpu;
187
188 free_vcpu:
189         kmem_cache_free(kvm_vcpu_cache, vcpu);
190 out:
191         return ERR_PTR(err);
192 }
193
194 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
195 {
196         kvm_vcpu_uninit(vcpu);
197         kmem_cache_free(kvm_vcpu_cache, vcpu);
198 }
199
200 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
201 {
202         kvm_arch_vcpu_free(vcpu);
203 }
204
205 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
206 {
207         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
208
209         return test_bit(priority, &vcpu->arch.pending_exceptions);
210 }
211
212 static void kvmppc_decrementer_func(unsigned long data)
213 {
214         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
215
216         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
217 }
218
219 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
220 {
221         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
222                     (unsigned long)vcpu);
223
224         return 0;
225 }
226
227 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
228 {
229 }
230
231 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
232 {
233 }
234
235 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
236 {
237 }
238
239 void decache_vcpus_on_cpu(int cpu)
240 {
241 }
242
243 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
244                                     struct kvm_debug_guest *dbg)
245 {
246         return -ENOTSUPP;
247 }
248
249 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
250                                      struct kvm_run *run)
251 {
252         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
253         *gpr = run->dcr.data;
254 }
255
256 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
257                                       struct kvm_run *run)
258 {
259         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
260
261         if (run->mmio.len > sizeof(*gpr)) {
262                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
263                 return;
264         }
265
266         if (vcpu->arch.mmio_is_bigendian) {
267                 switch (run->mmio.len) {
268                 case 4: *gpr = *(u32 *)run->mmio.data; break;
269                 case 2: *gpr = *(u16 *)run->mmio.data; break;
270                 case 1: *gpr = *(u8 *)run->mmio.data; break;
271                 }
272         } else {
273                 /* Convert BE data from userland back to LE. */
274                 switch (run->mmio.len) {
275                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
276                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
277                 case 1: *gpr = *(u8 *)run->mmio.data; break;
278                 }
279         }
280 }
281
282 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
283                        unsigned int rt, unsigned int bytes, int is_bigendian)
284 {
285         if (bytes > sizeof(run->mmio.data)) {
286                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
287                        run->mmio.len);
288         }
289
290         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
291         run->mmio.len = bytes;
292         run->mmio.is_write = 0;
293
294         vcpu->arch.io_gpr = rt;
295         vcpu->arch.mmio_is_bigendian = is_bigendian;
296         vcpu->mmio_needed = 1;
297         vcpu->mmio_is_write = 0;
298
299         return EMULATE_DO_MMIO;
300 }
301
302 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
303                         u32 val, unsigned int bytes, int is_bigendian)
304 {
305         void *data = run->mmio.data;
306
307         if (bytes > sizeof(run->mmio.data)) {
308                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
309                        run->mmio.len);
310         }
311
312         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
313         run->mmio.len = bytes;
314         run->mmio.is_write = 1;
315         vcpu->mmio_needed = 1;
316         vcpu->mmio_is_write = 1;
317
318         /* Store the value at the lowest bytes in 'data'. */
319         if (is_bigendian) {
320                 switch (bytes) {
321                 case 4: *(u32 *)data = val; break;
322                 case 2: *(u16 *)data = val; break;
323                 case 1: *(u8  *)data = val; break;
324                 }
325         } else {
326                 /* Store LE value into 'data'. */
327                 switch (bytes) {
328                 case 4: st_le32(data, val); break;
329                 case 2: st_le16(data, val); break;
330                 case 1: *(u8 *)data = val; break;
331                 }
332         }
333
334         return EMULATE_DO_MMIO;
335 }
336
337 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
338 {
339         int r;
340         sigset_t sigsaved;
341
342         if (vcpu->sigset_active)
343                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
344
345         if (vcpu->mmio_needed) {
346                 if (!vcpu->mmio_is_write)
347                         kvmppc_complete_mmio_load(vcpu, run);
348                 vcpu->mmio_needed = 0;
349         } else if (vcpu->arch.dcr_needed) {
350                 if (!vcpu->arch.dcr_is_write)
351                         kvmppc_complete_dcr_load(vcpu, run);
352                 vcpu->arch.dcr_needed = 0;
353         }
354
355         kvmppc_check_and_deliver_interrupts(vcpu);
356
357         local_irq_disable();
358         kvm_guest_enter();
359         r = __kvmppc_vcpu_run(run, vcpu);
360         kvm_guest_exit();
361         local_irq_enable();
362
363         if (vcpu->sigset_active)
364                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
365
366         return r;
367 }
368
369 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
370 {
371         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
372         return 0;
373 }
374
375 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
376                                     struct kvm_mp_state *mp_state)
377 {
378         return -EINVAL;
379 }
380
381 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
382                                     struct kvm_mp_state *mp_state)
383 {
384         return -EINVAL;
385 }
386
387 long kvm_arch_vcpu_ioctl(struct file *filp,
388                          unsigned int ioctl, unsigned long arg)
389 {
390         struct kvm_vcpu *vcpu = filp->private_data;
391         void __user *argp = (void __user *)arg;
392         long r;
393
394         switch (ioctl) {
395         case KVM_INTERRUPT: {
396                 struct kvm_interrupt irq;
397                 r = -EFAULT;
398                 if (copy_from_user(&irq, argp, sizeof(irq)))
399                         goto out;
400                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
401                 break;
402         }
403         default:
404                 r = -EINVAL;
405         }
406
407 out:
408         return r;
409 }
410
411 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
412 {
413         return -ENOTSUPP;
414 }
415
416 long kvm_arch_vm_ioctl(struct file *filp,
417                        unsigned int ioctl, unsigned long arg)
418 {
419         long r;
420
421         switch (ioctl) {
422         default:
423                 r = -EINVAL;
424         }
425
426         return r;
427 }
428
429 int kvm_arch_init(void *opaque)
430 {
431         return 0;
432 }
433
434 void kvm_arch_exit(void)
435 {
436 }