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TOMOYO Linux Cross Reference
Linux/arch/x86/kvm/irq_comm.c

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  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  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 21  */
 22 
 23 #include <linux/kvm_host.h>
 24 #include <linux/slab.h>
 25 #include <linux/export.h>
 26 #include <linux/rculist.h>
 27 
 28 #include <trace/events/kvm.h>
 29 
 30 #include <asm/msidef.h>
 31 
 32 #include "irq.h"
 33 
 34 #include "ioapic.h"
 35 
 36 #include "lapic.h"
 37 
 38 #include "hyperv.h"
 39 #include "x86.h"
 40 
 41 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
 42                            struct kvm *kvm, int irq_source_id, int level,
 43                            bool line_status)
 44 {
 45         struct kvm_pic *pic = kvm->arch.vpic;
 46         return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
 47 }
 48 
 49 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
 50                               struct kvm *kvm, int irq_source_id, int level,
 51                               bool line_status)
 52 {
 53         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 54         return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
 55                                 line_status);
 56 }
 57 
 58 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 59                 struct kvm_lapic_irq *irq, struct dest_map *dest_map)
 60 {
 61         int i, r = -1;
 62         struct kvm_vcpu *vcpu, *lowest = NULL;
 63         unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 64         unsigned int dest_vcpus = 0;
 65 
 66         if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
 67                         kvm_lowest_prio_delivery(irq)) {
 68                 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
 69                 irq->delivery_mode = APIC_DM_FIXED;
 70         }
 71 
 72         if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
 73                 return r;
 74 
 75         memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap));
 76 
 77         kvm_for_each_vcpu(i, vcpu, kvm) {
 78                 if (!kvm_apic_present(vcpu))
 79                         continue;
 80 
 81                 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
 82                                         irq->dest_id, irq->dest_mode))
 83                         continue;
 84 
 85                 if (!kvm_lowest_prio_delivery(irq)) {
 86                         if (r < 0)
 87                                 r = 0;
 88                         r += kvm_apic_set_irq(vcpu, irq, dest_map);
 89                 } else if (kvm_lapic_enabled(vcpu)) {
 90                         if (!kvm_vector_hashing_enabled()) {
 91                                 if (!lowest)
 92                                         lowest = vcpu;
 93                                 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
 94                                         lowest = vcpu;
 95                         } else {
 96                                 __set_bit(i, dest_vcpu_bitmap);
 97                                 dest_vcpus++;
 98                         }
 99                 }
100         }
101 
102         if (dest_vcpus != 0) {
103                 int idx = kvm_vector_to_index(irq->vector, dest_vcpus,
104                                         dest_vcpu_bitmap, KVM_MAX_VCPUS);
105 
106                 lowest = kvm_get_vcpu(kvm, idx);
107         }
108 
109         if (lowest)
110                 r = kvm_apic_set_irq(lowest, irq, dest_map);
111 
112         return r;
113 }
114 
115 void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
116                      struct kvm_lapic_irq *irq)
117 {
118         trace_kvm_msi_set_irq(e->msi.address_lo | (kvm->arch.x2apic_format ?
119                                              (u64)e->msi.address_hi << 32 : 0),
120                               e->msi.data);
121 
122         irq->dest_id = (e->msi.address_lo &
123                         MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
124         if (kvm->arch.x2apic_format)
125                 irq->dest_id |= MSI_ADDR_EXT_DEST_ID(e->msi.address_hi);
126         irq->vector = (e->msi.data &
127                         MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
128         irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
129         irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
130         irq->delivery_mode = e->msi.data & 0x700;
131         irq->msi_redir_hint = ((e->msi.address_lo
132                 & MSI_ADDR_REDIRECTION_LOWPRI) > 0);
133         irq->level = 1;
134         irq->shorthand = 0;
135 }
136 EXPORT_SYMBOL_GPL(kvm_set_msi_irq);
137 
138 static inline bool kvm_msi_route_invalid(struct kvm *kvm,
139                 struct kvm_kernel_irq_routing_entry *e)
140 {
141         return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff);
142 }
143 
144 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
145                 struct kvm *kvm, int irq_source_id, int level, bool line_status)
146 {
147         struct kvm_lapic_irq irq;
148 
149         if (kvm_msi_route_invalid(kvm, e))
150                 return -EINVAL;
151 
152         if (!level)
153                 return -1;
154 
155         kvm_set_msi_irq(kvm, e, &irq);
156 
157         return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
158 }
159 
160 
161 static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
162                     struct kvm *kvm, int irq_source_id, int level,
163                     bool line_status)
164 {
165         if (!level)
166                 return -1;
167 
168         return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint);
169 }
170 
171 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
172                               struct kvm *kvm, int irq_source_id, int level,
173                               bool line_status)
174 {
175         struct kvm_lapic_irq irq;
176         int r;
177 
178         switch (e->type) {
179         case KVM_IRQ_ROUTING_HV_SINT:
180                 return kvm_hv_set_sint(e, kvm, irq_source_id, level,
181                                        line_status);
182 
183         case KVM_IRQ_ROUTING_MSI:
184                 if (kvm_msi_route_invalid(kvm, e))
185                         return -EINVAL;
186 
187                 kvm_set_msi_irq(kvm, e, &irq);
188 
189                 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
190                         return r;
191                 break;
192 
193         default:
194                 break;
195         }
196 
197         return -EWOULDBLOCK;
198 }
199 
200 int kvm_request_irq_source_id(struct kvm *kvm)
201 {
202         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
203         int irq_source_id;
204 
205         mutex_lock(&kvm->irq_lock);
206         irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
207 
208         if (irq_source_id >= BITS_PER_LONG) {
209                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
210                 irq_source_id = -EFAULT;
211                 goto unlock;
212         }
213 
214         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
215         ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
216         set_bit(irq_source_id, bitmap);
217 unlock:
218         mutex_unlock(&kvm->irq_lock);
219 
220         return irq_source_id;
221 }
222 
223 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
224 {
225         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
226         ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
227 
228         mutex_lock(&kvm->irq_lock);
229         if (irq_source_id < 0 ||
230             irq_source_id >= BITS_PER_LONG) {
231                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
232                 goto unlock;
233         }
234         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
235         if (!irqchip_kernel(kvm))
236                 goto unlock;
237 
238         kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
239         kvm_pic_clear_all(kvm->arch.vpic, irq_source_id);
240 unlock:
241         mutex_unlock(&kvm->irq_lock);
242 }
243 
244 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
245                                     struct kvm_irq_mask_notifier *kimn)
246 {
247         mutex_lock(&kvm->irq_lock);
248         kimn->irq = irq;
249         hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list);
250         mutex_unlock(&kvm->irq_lock);
251 }
252 
253 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
254                                       struct kvm_irq_mask_notifier *kimn)
255 {
256         mutex_lock(&kvm->irq_lock);
257         hlist_del_rcu(&kimn->link);
258         mutex_unlock(&kvm->irq_lock);
259         synchronize_srcu(&kvm->irq_srcu);
260 }
261 
262 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
263                              bool mask)
264 {
265         struct kvm_irq_mask_notifier *kimn;
266         int idx, gsi;
267 
268         idx = srcu_read_lock(&kvm->irq_srcu);
269         gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
270         if (gsi != -1)
271                 hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link)
272                         if (kimn->irq == gsi)
273                                 kimn->func(kimn, mask);
274         srcu_read_unlock(&kvm->irq_srcu, idx);
275 }
276 
277 bool kvm_arch_can_set_irq_routing(struct kvm *kvm)
278 {
279         return irqchip_in_kernel(kvm);
280 }
281 
282 int kvm_set_routing_entry(struct kvm *kvm,
283                           struct kvm_kernel_irq_routing_entry *e,
284                           const struct kvm_irq_routing_entry *ue)
285 {
286         /* We can't check irqchip_in_kernel() here as some callers are
287          * currently inititalizing the irqchip. Other callers should therefore
288          * check kvm_arch_can_set_irq_routing() before calling this function.
289          */
290         switch (ue->type) {
291         case KVM_IRQ_ROUTING_IRQCHIP:
292                 if (irqchip_split(kvm))
293                         return -EINVAL;
294                 e->irqchip.pin = ue->u.irqchip.pin;
295                 switch (ue->u.irqchip.irqchip) {
296                 case KVM_IRQCHIP_PIC_SLAVE:
297                         e->irqchip.pin += PIC_NUM_PINS / 2;
298                         /* fall through */
299                 case KVM_IRQCHIP_PIC_MASTER:
300                         if (ue->u.irqchip.pin >= PIC_NUM_PINS / 2)
301                                 return -EINVAL;
302                         e->set = kvm_set_pic_irq;
303                         break;
304                 case KVM_IRQCHIP_IOAPIC:
305                         if (ue->u.irqchip.pin >= KVM_IOAPIC_NUM_PINS)
306                                 return -EINVAL;
307                         e->set = kvm_set_ioapic_irq;
308                         break;
309                 default:
310                         return -EINVAL;
311                 }
312                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
313                 break;
314         case KVM_IRQ_ROUTING_MSI:
315                 e->set = kvm_set_msi;
316                 e->msi.address_lo = ue->u.msi.address_lo;
317                 e->msi.address_hi = ue->u.msi.address_hi;
318                 e->msi.data = ue->u.msi.data;
319 
320                 if (kvm_msi_route_invalid(kvm, e))
321                         return -EINVAL;
322                 break;
323         case KVM_IRQ_ROUTING_HV_SINT:
324                 e->set = kvm_hv_set_sint;
325                 e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
326                 e->hv_sint.sint = ue->u.hv_sint.sint;
327                 break;
328         default:
329                 return -EINVAL;
330         }
331 
332         return 0;
333 }
334 
335 bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
336                              struct kvm_vcpu **dest_vcpu)
337 {
338         int i, r = 0;
339         struct kvm_vcpu *vcpu;
340 
341         if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
342                 return true;
343 
344         kvm_for_each_vcpu(i, vcpu, kvm) {
345                 if (!kvm_apic_present(vcpu))
346                         continue;
347 
348                 if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
349                                         irq->dest_id, irq->dest_mode))
350                         continue;
351 
352                 if (++r == 2)
353                         return false;
354 
355                 *dest_vcpu = vcpu;
356         }
357 
358         return r == 1;
359 }
360 EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
361 
362 #define IOAPIC_ROUTING_ENTRY(irq) \
363         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
364           .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
365 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
366 
367 #define PIC_ROUTING_ENTRY(irq) \
368         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
369           .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } }
370 #define ROUTING_ENTRY2(irq) \
371         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
372 
373 static const struct kvm_irq_routing_entry default_routing[] = {
374         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
375         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
376         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
377         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
378         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
379         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
380         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
381         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
382         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
383         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
384         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
385         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
386 };
387 
388 int kvm_setup_default_irq_routing(struct kvm *kvm)
389 {
390         return kvm_set_irq_routing(kvm, default_routing,
391                                    ARRAY_SIZE(default_routing), 0);
392 }
393 
394 static const struct kvm_irq_routing_entry empty_routing[] = {};
395 
396 int kvm_setup_empty_irq_routing(struct kvm *kvm)
397 {
398         return kvm_set_irq_routing(kvm, empty_routing, 0, 0);
399 }
400 
401 void kvm_arch_post_irq_routing_update(struct kvm *kvm)
402 {
403         if (!irqchip_split(kvm))
404                 return;
405         kvm_make_scan_ioapic_request(kvm);
406 }
407 
408 void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
409                             ulong *ioapic_handled_vectors)
410 {
411         struct kvm *kvm = vcpu->kvm;
412         struct kvm_kernel_irq_routing_entry *entry;
413         struct kvm_irq_routing_table *table;
414         u32 i, nr_ioapic_pins;
415         int idx;
416 
417         idx = srcu_read_lock(&kvm->irq_srcu);
418         table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
419         nr_ioapic_pins = min_t(u32, table->nr_rt_entries,
420                                kvm->arch.nr_reserved_ioapic_pins);
421         for (i = 0; i < nr_ioapic_pins; ++i) {
422                 hlist_for_each_entry(entry, &table->map[i], link) {
423                         struct kvm_lapic_irq irq;
424 
425                         if (entry->type != KVM_IRQ_ROUTING_MSI)
426                                 continue;
427 
428                         kvm_set_msi_irq(vcpu->kvm, entry, &irq);
429 
430                         if (irq.level && kvm_apic_match_dest(vcpu, NULL, 0,
431                                                 irq.dest_id, irq.dest_mode))
432                                 __set_bit(irq.vector, ioapic_handled_vectors);
433                 }
434         }
435         srcu_read_unlock(&kvm->irq_srcu, idx);
436 }
437 
438 void kvm_arch_irq_routing_update(struct kvm *kvm)
439 {
440         kvm_hv_irq_routing_update(kvm);
441 }
442 

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