KVM: MMU: nuke shadowed pgtable pages and ptes on memslot destruction
[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         return !!(v->arch.pending_exceptions);
40 }
41
42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
43 {
44         return !(v->arch.msr & MSR_WE);
45 }
46
47
48 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
49 {
50         enum emulation_result er;
51         int r;
52
53         er = kvmppc_emulate_instruction(run, vcpu);
54         switch (er) {
55         case EMULATE_DONE:
56                 /* Future optimization: only reload non-volatiles if they were
57                  * actually modified. */
58                 r = RESUME_GUEST_NV;
59                 break;
60         case EMULATE_DO_MMIO:
61                 run->exit_reason = KVM_EXIT_MMIO;
62                 /* We must reload nonvolatiles because "update" load/store
63                  * instructions modify register state. */
64                 /* Future optimization: only reload non-volatiles if they were
65                  * actually modified. */
66                 r = RESUME_HOST_NV;
67                 break;
68         case EMULATE_FAIL:
69                 /* XXX Deliver Program interrupt to guest. */
70                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
71                        vcpu->arch.last_inst);
72                 r = RESUME_HOST;
73                 break;
74         default:
75                 BUG();
76         }
77
78         return r;
79 }
80
81 void kvm_arch_hardware_enable(void *garbage)
82 {
83 }
84
85 void kvm_arch_hardware_disable(void *garbage)
86 {
87 }
88
89 int kvm_arch_hardware_setup(void)
90 {
91         return 0;
92 }
93
94 void kvm_arch_hardware_unsetup(void)
95 {
96 }
97
98 void kvm_arch_check_processor_compat(void *rtn)
99 {
100         int r;
101
102         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
103                 r = 0;
104         else
105                 r = -ENOTSUPP;
106
107         *(int *)rtn = r;
108 }
109
110 struct kvm *kvm_arch_create_vm(void)
111 {
112         struct kvm *kvm;
113
114         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
115         if (!kvm)
116                 return ERR_PTR(-ENOMEM);
117
118         return kvm;
119 }
120
121 static void kvmppc_free_vcpus(struct kvm *kvm)
122 {
123         unsigned int i;
124
125         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
126                 if (kvm->vcpus[i]) {
127                         kvm_arch_vcpu_free(kvm->vcpus[i]);
128                         kvm->vcpus[i] = NULL;
129                 }
130         }
131 }
132
133 void kvm_arch_destroy_vm(struct kvm *kvm)
134 {
135         kvmppc_free_vcpus(kvm);
136         kvm_free_physmem(kvm);
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_USER_MEMORY:
146                 r = 1;
147                 break;
148         case KVM_CAP_COALESCED_MMIO:
149                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
150                 break;
151         default:
152                 r = 0;
153                 break;
154         }
155         return r;
156
157 }
158
159 long kvm_arch_dev_ioctl(struct file *filp,
160                         unsigned int ioctl, unsigned long arg)
161 {
162         return -EINVAL;
163 }
164
165 int kvm_arch_set_memory_region(struct kvm *kvm,
166                                struct kvm_userspace_memory_region *mem,
167                                struct kvm_memory_slot old,
168                                int user_alloc)
169 {
170         return 0;
171 }
172
173 void kvm_arch_flush_shadow(struct kvm *kvm)
174 {
175 }
176
177 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
178 {
179         struct kvm_vcpu *vcpu;
180         int err;
181
182         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
183         if (!vcpu) {
184                 err = -ENOMEM;
185                 goto out;
186         }
187
188         err = kvm_vcpu_init(vcpu, kvm, id);
189         if (err)
190                 goto free_vcpu;
191
192         return vcpu;
193
194 free_vcpu:
195         kmem_cache_free(kvm_vcpu_cache, vcpu);
196 out:
197         return ERR_PTR(err);
198 }
199
200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
201 {
202         kvm_vcpu_uninit(vcpu);
203         kmem_cache_free(kvm_vcpu_cache, vcpu);
204 }
205
206 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
207 {
208         kvm_arch_vcpu_free(vcpu);
209 }
210
211 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
212 {
213         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
214
215         return test_bit(priority, &vcpu->arch.pending_exceptions);
216 }
217
218 static void kvmppc_decrementer_func(unsigned long data)
219 {
220         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
221
222         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
223
224         if (waitqueue_active(&vcpu->wq)) {
225                 wake_up_interruptible(&vcpu->wq);
226                 vcpu->stat.halt_wakeup++;
227         }
228 }
229
230 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
231 {
232         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
233                     (unsigned long)vcpu);
234
235         return 0;
236 }
237
238 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
239 {
240 }
241
242 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
243 {
244 }
245
246 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
247 {
248 }
249
250 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
251                                     struct kvm_debug_guest *dbg)
252 {
253         return -ENOTSUPP;
254 }
255
256 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
257                                      struct kvm_run *run)
258 {
259         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
260         *gpr = run->dcr.data;
261 }
262
263 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
264                                       struct kvm_run *run)
265 {
266         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
267
268         if (run->mmio.len > sizeof(*gpr)) {
269                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
270                 return;
271         }
272
273         if (vcpu->arch.mmio_is_bigendian) {
274                 switch (run->mmio.len) {
275                 case 4: *gpr = *(u32 *)run->mmio.data; break;
276                 case 2: *gpr = *(u16 *)run->mmio.data; break;
277                 case 1: *gpr = *(u8 *)run->mmio.data; break;
278                 }
279         } else {
280                 /* Convert BE data from userland back to LE. */
281                 switch (run->mmio.len) {
282                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
283                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
284                 case 1: *gpr = *(u8 *)run->mmio.data; break;
285                 }
286         }
287 }
288
289 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
290                        unsigned int rt, unsigned int bytes, int is_bigendian)
291 {
292         if (bytes > sizeof(run->mmio.data)) {
293                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
294                        run->mmio.len);
295         }
296
297         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
298         run->mmio.len = bytes;
299         run->mmio.is_write = 0;
300
301         vcpu->arch.io_gpr = rt;
302         vcpu->arch.mmio_is_bigendian = is_bigendian;
303         vcpu->mmio_needed = 1;
304         vcpu->mmio_is_write = 0;
305
306         return EMULATE_DO_MMIO;
307 }
308
309 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
310                         u32 val, unsigned int bytes, int is_bigendian)
311 {
312         void *data = run->mmio.data;
313
314         if (bytes > sizeof(run->mmio.data)) {
315                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
316                        run->mmio.len);
317         }
318
319         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
320         run->mmio.len = bytes;
321         run->mmio.is_write = 1;
322         vcpu->mmio_needed = 1;
323         vcpu->mmio_is_write = 1;
324
325         /* Store the value at the lowest bytes in 'data'. */
326         if (is_bigendian) {
327                 switch (bytes) {
328                 case 4: *(u32 *)data = val; break;
329                 case 2: *(u16 *)data = val; break;
330                 case 1: *(u8  *)data = val; break;
331                 }
332         } else {
333                 /* Store LE value into 'data'. */
334                 switch (bytes) {
335                 case 4: st_le32(data, val); break;
336                 case 2: st_le16(data, val); break;
337                 case 1: *(u8 *)data = val; break;
338                 }
339         }
340
341         return EMULATE_DO_MMIO;
342 }
343
344 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
345 {
346         int r;
347         sigset_t sigsaved;
348
349         vcpu_load(vcpu);
350
351         if (vcpu->sigset_active)
352                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
353
354         if (vcpu->mmio_needed) {
355                 if (!vcpu->mmio_is_write)
356                         kvmppc_complete_mmio_load(vcpu, run);
357                 vcpu->mmio_needed = 0;
358         } else if (vcpu->arch.dcr_needed) {
359                 if (!vcpu->arch.dcr_is_write)
360                         kvmppc_complete_dcr_load(vcpu, run);
361                 vcpu->arch.dcr_needed = 0;
362         }
363
364         kvmppc_check_and_deliver_interrupts(vcpu);
365
366         local_irq_disable();
367         kvm_guest_enter();
368         r = __kvmppc_vcpu_run(run, vcpu);
369         kvm_guest_exit();
370         local_irq_enable();
371
372         if (vcpu->sigset_active)
373                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
374
375         vcpu_put(vcpu);
376
377         return r;
378 }
379
380 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
381 {
382         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
383
384         if (waitqueue_active(&vcpu->wq)) {
385                 wake_up_interruptible(&vcpu->wq);
386                 vcpu->stat.halt_wakeup++;
387         }
388
389         return 0;
390 }
391
392 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
393                                     struct kvm_mp_state *mp_state)
394 {
395         return -EINVAL;
396 }
397
398 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
399                                     struct kvm_mp_state *mp_state)
400 {
401         return -EINVAL;
402 }
403
404 long kvm_arch_vcpu_ioctl(struct file *filp,
405                          unsigned int ioctl, unsigned long arg)
406 {
407         struct kvm_vcpu *vcpu = filp->private_data;
408         void __user *argp = (void __user *)arg;
409         long r;
410
411         switch (ioctl) {
412         case KVM_INTERRUPT: {
413                 struct kvm_interrupt irq;
414                 r = -EFAULT;
415                 if (copy_from_user(&irq, argp, sizeof(irq)))
416                         goto out;
417                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
418                 break;
419         }
420         default:
421                 r = -EINVAL;
422         }
423
424 out:
425         return r;
426 }
427
428 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
429 {
430         return -ENOTSUPP;
431 }
432
433 long kvm_arch_vm_ioctl(struct file *filp,
434                        unsigned int ioctl, unsigned long arg)
435 {
436         long r;
437
438         switch (ioctl) {
439         default:
440                 r = -EINVAL;
441         }
442
443         return r;
444 }
445
446 int kvm_arch_init(void *opaque)
447 {
448         return 0;
449 }
450
451 void kvm_arch_exit(void)
452 {
453 }