mmap_min_addr check CAP_SYS_RAWIO only for write
[sfrench/cifs-2.6.git] / virt / kvm / irq_comm.c
1 /*
2  * irq_comm.c: Common API for in kernel interrupt controller
3  * Copyright (c) 2007, Intel Corporation.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16  * Place - Suite 330, Boston, MA 02111-1307 USA.
17  * Authors:
18  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
19  *
20  */
21
22 #include <linux/kvm_host.h>
23 #include <linux/slab.h>
24 #include <trace/events/kvm.h>
25
26 #include <asm/msidef.h>
27 #ifdef CONFIG_IA64
28 #include <asm/iosapic.h>
29 #endif
30
31 #include "irq.h"
32
33 #include "ioapic.h"
34
35 static inline int kvm_irq_line_state(unsigned long *irq_state,
36                                      int irq_source_id, int level)
37 {
38         /* Logical OR for level trig interrupt */
39         if (level)
40                 set_bit(irq_source_id, irq_state);
41         else
42                 clear_bit(irq_source_id, irq_state);
43
44         return !!(*irq_state);
45 }
46
47 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
48                            struct kvm *kvm, int irq_source_id, int level)
49 {
50 #ifdef CONFIG_X86
51         struct kvm_pic *pic = pic_irqchip(kvm);
52         level = kvm_irq_line_state(&pic->irq_states[e->irqchip.pin],
53                                    irq_source_id, level);
54         return kvm_pic_set_irq(pic, e->irqchip.pin, level);
55 #else
56         return -1;
57 #endif
58 }
59
60 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
61                               struct kvm *kvm, int irq_source_id, int level)
62 {
63         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
64         level = kvm_irq_line_state(&ioapic->irq_states[e->irqchip.pin],
65                                    irq_source_id, level);
66
67         return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, level);
68 }
69
70 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
71 {
72 #ifdef CONFIG_IA64
73         return irq->delivery_mode ==
74                 (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
75 #else
76         return irq->delivery_mode == APIC_DM_LOWEST;
77 #endif
78 }
79
80 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
81                 struct kvm_lapic_irq *irq)
82 {
83         int i, r = -1;
84         struct kvm_vcpu *vcpu, *lowest = NULL;
85
86         if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
87                         kvm_is_dm_lowest_prio(irq))
88                 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
89
90         kvm_for_each_vcpu(i, vcpu, kvm) {
91                 if (!kvm_apic_present(vcpu))
92                         continue;
93
94                 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
95                                         irq->dest_id, irq->dest_mode))
96                         continue;
97
98                 if (!kvm_is_dm_lowest_prio(irq)) {
99                         if (r < 0)
100                                 r = 0;
101                         r += kvm_apic_set_irq(vcpu, irq);
102                 } else {
103                         if (!lowest)
104                                 lowest = vcpu;
105                         else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
106                                 lowest = vcpu;
107                 }
108         }
109
110         if (lowest)
111                 r = kvm_apic_set_irq(lowest, irq);
112
113         return r;
114 }
115
116 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
117                        struct kvm *kvm, int irq_source_id, int level)
118 {
119         struct kvm_lapic_irq irq;
120
121         if (!level)
122                 return -1;
123
124         trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
125
126         irq.dest_id = (e->msi.address_lo &
127                         MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
128         irq.vector = (e->msi.data &
129                         MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
130         irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
131         irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
132         irq.delivery_mode = e->msi.data & 0x700;
133         irq.level = 1;
134         irq.shorthand = 0;
135
136         /* TODO Deal with RH bit of MSI message address */
137         return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
138 }
139
140 /*
141  * Return value:
142  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
143  *  = 0   Interrupt was coalesced (previous irq is still pending)
144  *  > 0   Number of CPUs interrupt was delivered to
145  */
146 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
147 {
148         struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
149         int ret = -1, i = 0;
150         struct kvm_irq_routing_table *irq_rt;
151         struct hlist_node *n;
152
153         trace_kvm_set_irq(irq, level, irq_source_id);
154
155         /* Not possible to detect if the guest uses the PIC or the
156          * IOAPIC.  So set the bit in both. The guest will ignore
157          * writes to the unused one.
158          */
159         rcu_read_lock();
160         irq_rt = rcu_dereference(kvm->irq_routing);
161         if (irq < irq_rt->nr_rt_entries)
162                 hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
163                         irq_set[i++] = *e;
164         rcu_read_unlock();
165
166         while(i--) {
167                 int r;
168                 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
169                 if (r < 0)
170                         continue;
171
172                 ret = r + ((ret < 0) ? 0 : ret);
173         }
174
175         return ret;
176 }
177
178 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
179 {
180         struct kvm_irq_ack_notifier *kian;
181         struct hlist_node *n;
182         int gsi;
183
184         trace_kvm_ack_irq(irqchip, pin);
185
186         rcu_read_lock();
187         gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
188         if (gsi != -1)
189                 hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
190                                          link)
191                         if (kian->gsi == gsi)
192                                 kian->irq_acked(kian);
193         rcu_read_unlock();
194 }
195
196 void kvm_register_irq_ack_notifier(struct kvm *kvm,
197                                    struct kvm_irq_ack_notifier *kian)
198 {
199         mutex_lock(&kvm->irq_lock);
200         hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
201         mutex_unlock(&kvm->irq_lock);
202 }
203
204 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
205                                     struct kvm_irq_ack_notifier *kian)
206 {
207         mutex_lock(&kvm->irq_lock);
208         hlist_del_init_rcu(&kian->link);
209         mutex_unlock(&kvm->irq_lock);
210         synchronize_rcu();
211 }
212
213 int kvm_request_irq_source_id(struct kvm *kvm)
214 {
215         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
216         int irq_source_id;
217
218         mutex_lock(&kvm->irq_lock);
219         irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
220
221         if (irq_source_id >= BITS_PER_LONG) {
222                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
223                 irq_source_id = -EFAULT;
224                 goto unlock;
225         }
226
227         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
228         set_bit(irq_source_id, bitmap);
229 unlock:
230         mutex_unlock(&kvm->irq_lock);
231
232         return irq_source_id;
233 }
234
235 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
236 {
237         int i;
238
239         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
240
241         mutex_lock(&kvm->irq_lock);
242         if (irq_source_id < 0 ||
243             irq_source_id >= BITS_PER_LONG) {
244                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
245                 goto unlock;
246         }
247         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
248         if (!irqchip_in_kernel(kvm))
249                 goto unlock;
250
251         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
252                 clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
253                 if (i >= 16)
254                         continue;
255 #ifdef CONFIG_X86
256                 clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
257 #endif
258         }
259 unlock:
260         mutex_unlock(&kvm->irq_lock);
261 }
262
263 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
264                                     struct kvm_irq_mask_notifier *kimn)
265 {
266         mutex_lock(&kvm->irq_lock);
267         kimn->irq = irq;
268         hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
269         mutex_unlock(&kvm->irq_lock);
270 }
271
272 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
273                                       struct kvm_irq_mask_notifier *kimn)
274 {
275         mutex_lock(&kvm->irq_lock);
276         hlist_del_rcu(&kimn->link);
277         mutex_unlock(&kvm->irq_lock);
278         synchronize_rcu();
279 }
280
281 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
282 {
283         struct kvm_irq_mask_notifier *kimn;
284         struct hlist_node *n;
285
286         rcu_read_lock();
287         hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
288                 if (kimn->irq == irq)
289                         kimn->func(kimn, mask);
290         rcu_read_unlock();
291 }
292
293 void kvm_free_irq_routing(struct kvm *kvm)
294 {
295         /* Called only during vm destruction. Nobody can use the pointer
296            at this stage */
297         kfree(kvm->irq_routing);
298 }
299
300 static int setup_routing_entry(struct kvm_irq_routing_table *rt,
301                                struct kvm_kernel_irq_routing_entry *e,
302                                const struct kvm_irq_routing_entry *ue)
303 {
304         int r = -EINVAL;
305         int delta;
306         unsigned max_pin;
307         struct kvm_kernel_irq_routing_entry *ei;
308         struct hlist_node *n;
309
310         /*
311          * Do not allow GSI to be mapped to the same irqchip more than once.
312          * Allow only one to one mapping between GSI and MSI.
313          */
314         hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
315                 if (ei->type == KVM_IRQ_ROUTING_MSI ||
316                     ue->u.irqchip.irqchip == ei->irqchip.irqchip)
317                         return r;
318
319         e->gsi = ue->gsi;
320         e->type = ue->type;
321         switch (ue->type) {
322         case KVM_IRQ_ROUTING_IRQCHIP:
323                 delta = 0;
324                 switch (ue->u.irqchip.irqchip) {
325                 case KVM_IRQCHIP_PIC_MASTER:
326                         e->set = kvm_set_pic_irq;
327                         max_pin = 16;
328                         break;
329                 case KVM_IRQCHIP_PIC_SLAVE:
330                         e->set = kvm_set_pic_irq;
331                         max_pin = 16;
332                         delta = 8;
333                         break;
334                 case KVM_IRQCHIP_IOAPIC:
335                         max_pin = KVM_IOAPIC_NUM_PINS;
336                         e->set = kvm_set_ioapic_irq;
337                         break;
338                 default:
339                         goto out;
340                 }
341                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
342                 e->irqchip.pin = ue->u.irqchip.pin + delta;
343                 if (e->irqchip.pin >= max_pin)
344                         goto out;
345                 rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
346                 break;
347         case KVM_IRQ_ROUTING_MSI:
348                 e->set = kvm_set_msi;
349                 e->msi.address_lo = ue->u.msi.address_lo;
350                 e->msi.address_hi = ue->u.msi.address_hi;
351                 e->msi.data = ue->u.msi.data;
352                 break;
353         default:
354                 goto out;
355         }
356
357         hlist_add_head(&e->link, &rt->map[e->gsi]);
358         r = 0;
359 out:
360         return r;
361 }
362
363
364 int kvm_set_irq_routing(struct kvm *kvm,
365                         const struct kvm_irq_routing_entry *ue,
366                         unsigned nr,
367                         unsigned flags)
368 {
369         struct kvm_irq_routing_table *new, *old;
370         u32 i, j, nr_rt_entries = 0;
371         int r;
372
373         for (i = 0; i < nr; ++i) {
374                 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
375                         return -EINVAL;
376                 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
377         }
378
379         nr_rt_entries += 1;
380
381         new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
382                       + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
383                       GFP_KERNEL);
384
385         if (!new)
386                 return -ENOMEM;
387
388         new->rt_entries = (void *)&new->map[nr_rt_entries];
389
390         new->nr_rt_entries = nr_rt_entries;
391         for (i = 0; i < 3; i++)
392                 for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
393                         new->chip[i][j] = -1;
394
395         for (i = 0; i < nr; ++i) {
396                 r = -EINVAL;
397                 if (ue->flags)
398                         goto out;
399                 r = setup_routing_entry(new, &new->rt_entries[i], ue);
400                 if (r)
401                         goto out;
402                 ++ue;
403         }
404
405         mutex_lock(&kvm->irq_lock);
406         old = kvm->irq_routing;
407         rcu_assign_pointer(kvm->irq_routing, new);
408         mutex_unlock(&kvm->irq_lock);
409         synchronize_rcu();
410
411         new = old;
412         r = 0;
413
414 out:
415         kfree(new);
416         return r;
417 }
418
419 #define IOAPIC_ROUTING_ENTRY(irq) \
420         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
421           .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
422 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
423
424 #ifdef CONFIG_X86
425 #  define PIC_ROUTING_ENTRY(irq) \
426         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
427           .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
428 #  define ROUTING_ENTRY2(irq) \
429         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
430 #else
431 #  define ROUTING_ENTRY2(irq) \
432         IOAPIC_ROUTING_ENTRY(irq)
433 #endif
434
435 static const struct kvm_irq_routing_entry default_routing[] = {
436         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
437         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
438         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
439         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
440         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
441         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
442         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
443         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
444         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
445         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
446         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
447         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
448 #ifdef CONFIG_IA64
449         ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
450         ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
451         ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
452         ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
453         ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
454         ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
455         ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
456         ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
457         ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
458         ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
459         ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
460         ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
461 #endif
462 };
463
464 int kvm_setup_default_irq_routing(struct kvm *kvm)
465 {
466         return kvm_set_irq_routing(kvm, default_routing,
467                                    ARRAY_SIZE(default_routing), 0);
468 }