KVM: Return -ENOTTY on unrecognized ioctls
[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 #define CREATE_TRACE_POINTS
35 #include "trace.h"
36
37 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
38 {
39         return gfn;
40 }
41
42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
43 {
44         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
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 *)rtn = kvmppc_core_check_processor_compat();
101 }
102
103 struct kvm *kvm_arch_create_vm(void)
104 {
105         struct kvm *kvm;
106
107         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
108         if (!kvm)
109                 return ERR_PTR(-ENOMEM);
110
111         return kvm;
112 }
113
114 static void kvmppc_free_vcpus(struct kvm *kvm)
115 {
116         unsigned int i;
117         struct kvm_vcpu *vcpu;
118
119         kvm_for_each_vcpu(i, vcpu, kvm)
120                 kvm_arch_vcpu_free(vcpu);
121
122         mutex_lock(&kvm->lock);
123         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
124                 kvm->vcpus[i] = NULL;
125
126         atomic_set(&kvm->online_vcpus, 0);
127         mutex_unlock(&kvm->lock);
128 }
129
130 void kvm_arch_sync_events(struct kvm *kvm)
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_COALESCED_MMIO:
147                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
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 void kvm_arch_flush_shadow(struct kvm *kvm)
172 {
173 }
174
175 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
176 {
177         struct kvm_vcpu *vcpu;
178         vcpu = kvmppc_core_vcpu_create(kvm, id);
179         kvmppc_create_vcpu_debugfs(vcpu, id);
180         return vcpu;
181 }
182
183 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
184 {
185         kvmppc_remove_vcpu_debugfs(vcpu);
186         kvmppc_core_vcpu_free(vcpu);
187 }
188
189 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
190 {
191         kvm_arch_vcpu_free(vcpu);
192 }
193
194 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
195 {
196         return kvmppc_core_pending_dec(vcpu);
197 }
198
199 static void kvmppc_decrementer_func(unsigned long data)
200 {
201         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
202
203         kvmppc_core_queue_dec(vcpu);
204
205         if (waitqueue_active(&vcpu->wq)) {
206                 wake_up_interruptible(&vcpu->wq);
207                 vcpu->stat.halt_wakeup++;
208         }
209 }
210
211 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
212 {
213         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
214                     (unsigned long)vcpu);
215
216         return 0;
217 }
218
219 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
220 {
221         kvmppc_mmu_destroy(vcpu);
222 }
223
224 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
225 {
226         kvmppc_core_vcpu_load(vcpu, cpu);
227 }
228
229 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
230 {
231         kvmppc_core_vcpu_put(vcpu);
232 }
233
234 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
235                                         struct kvm_guest_debug *dbg)
236 {
237         return -EINVAL;
238 }
239
240 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
241                                      struct kvm_run *run)
242 {
243         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
244         *gpr = run->dcr.data;
245 }
246
247 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
248                                       struct kvm_run *run)
249 {
250         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
251
252         if (run->mmio.len > sizeof(*gpr)) {
253                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
254                 return;
255         }
256
257         if (vcpu->arch.mmio_is_bigendian) {
258                 switch (run->mmio.len) {
259                 case 4: *gpr = *(u32 *)run->mmio.data; break;
260                 case 2: *gpr = *(u16 *)run->mmio.data; break;
261                 case 1: *gpr = *(u8 *)run->mmio.data; break;
262                 }
263         } else {
264                 /* Convert BE data from userland back to LE. */
265                 switch (run->mmio.len) {
266                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
267                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
268                 case 1: *gpr = *(u8 *)run->mmio.data; break;
269                 }
270         }
271 }
272
273 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
274                        unsigned int rt, unsigned int bytes, int is_bigendian)
275 {
276         if (bytes > sizeof(run->mmio.data)) {
277                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
278                        run->mmio.len);
279         }
280
281         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
282         run->mmio.len = bytes;
283         run->mmio.is_write = 0;
284
285         vcpu->arch.io_gpr = rt;
286         vcpu->arch.mmio_is_bigendian = is_bigendian;
287         vcpu->mmio_needed = 1;
288         vcpu->mmio_is_write = 0;
289
290         return EMULATE_DO_MMIO;
291 }
292
293 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
294                         u32 val, unsigned int bytes, int is_bigendian)
295 {
296         void *data = run->mmio.data;
297
298         if (bytes > sizeof(run->mmio.data)) {
299                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
300                        run->mmio.len);
301         }
302
303         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
304         run->mmio.len = bytes;
305         run->mmio.is_write = 1;
306         vcpu->mmio_needed = 1;
307         vcpu->mmio_is_write = 1;
308
309         /* Store the value at the lowest bytes in 'data'. */
310         if (is_bigendian) {
311                 switch (bytes) {
312                 case 4: *(u32 *)data = val; break;
313                 case 2: *(u16 *)data = val; break;
314                 case 1: *(u8  *)data = val; break;
315                 }
316         } else {
317                 /* Store LE value into 'data'. */
318                 switch (bytes) {
319                 case 4: st_le32(data, val); break;
320                 case 2: st_le16(data, val); break;
321                 case 1: *(u8 *)data = val; break;
322                 }
323         }
324
325         return EMULATE_DO_MMIO;
326 }
327
328 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
329 {
330         int r;
331         sigset_t sigsaved;
332
333         vcpu_load(vcpu);
334
335         if (vcpu->sigset_active)
336                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
337
338         if (vcpu->mmio_needed) {
339                 if (!vcpu->mmio_is_write)
340                         kvmppc_complete_mmio_load(vcpu, run);
341                 vcpu->mmio_needed = 0;
342         } else if (vcpu->arch.dcr_needed) {
343                 if (!vcpu->arch.dcr_is_write)
344                         kvmppc_complete_dcr_load(vcpu, run);
345                 vcpu->arch.dcr_needed = 0;
346         }
347
348         kvmppc_core_deliver_interrupts(vcpu);
349
350         local_irq_disable();
351         kvm_guest_enter();
352         r = __kvmppc_vcpu_run(run, vcpu);
353         kvm_guest_exit();
354         local_irq_enable();
355
356         if (vcpu->sigset_active)
357                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
358
359         vcpu_put(vcpu);
360
361         return r;
362 }
363
364 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
365 {
366         kvmppc_core_queue_external(vcpu, irq);
367
368         if (waitqueue_active(&vcpu->wq)) {
369                 wake_up_interruptible(&vcpu->wq);
370                 vcpu->stat.halt_wakeup++;
371         }
372
373         return 0;
374 }
375
376 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
377                                     struct kvm_mp_state *mp_state)
378 {
379         return -EINVAL;
380 }
381
382 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
383                                     struct kvm_mp_state *mp_state)
384 {
385         return -EINVAL;
386 }
387
388 long kvm_arch_vcpu_ioctl(struct file *filp,
389                          unsigned int ioctl, unsigned long arg)
390 {
391         struct kvm_vcpu *vcpu = filp->private_data;
392         void __user *argp = (void __user *)arg;
393         long r;
394
395         switch (ioctl) {
396         case KVM_INTERRUPT: {
397                 struct kvm_interrupt irq;
398                 r = -EFAULT;
399                 if (copy_from_user(&irq, argp, sizeof(irq)))
400                         goto out;
401                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
402                 break;
403         }
404         default:
405                 r = -EINVAL;
406         }
407
408 out:
409         return r;
410 }
411
412 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
413 {
414         return -ENOTSUPP;
415 }
416
417 long kvm_arch_vm_ioctl(struct file *filp,
418                        unsigned int ioctl, unsigned long arg)
419 {
420         long r;
421
422         switch (ioctl) {
423         default:
424                 r = -ENOTTY;
425         }
426
427         return r;
428 }
429
430 int kvm_arch_init(void *opaque)
431 {
432         return 0;
433 }
434
435 void kvm_arch_exit(void)
436 {
437 }