SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  24 #include <asm/msidef.h>
  25
  26 #include "irq.h"
  27
  28 #include "ioapic.h"
  29
  30 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
  31                            struct kvm *kvm, int level)
  32 {
  33 #ifdef CONFIG_X86
  34         return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
  35 #else
  36         return -1;
  37 #endif
  38 }
  39
  40 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
  41                               struct kvm *kvm, int level)
  42 {
  43         return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
  44 }
  45
  46 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
  47                                    union kvm_ioapic_redirect_entry *entry,
  48                                    unsigned long *deliver_bitmask)
  49 {
  50         int i;
  51         struct kvm *kvm = ioapic->kvm;
  52         struct kvm_vcpu *vcpu;
  53
  54         bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
  55
  56         if (entry->fields.dest_mode == 0) {     /* Physical mode. */
  57                 if (entry->fields.dest_id == 0xFF) {    /* Broadcast. */
  58                         for (i = 0; i < KVM_MAX_VCPUS; ++i)
  59                                 if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
  60                                         __set_bit(i, deliver_bitmask);
  61                         /* Lowest priority shouldn't combine with broadcast */
  62                         if (entry->fields.delivery_mode ==
  63                             IOAPIC_LOWEST_PRIORITY && printk_ratelimit())
  64                                 printk(KERN_INFO "kvm: apic: phys broadcast "
  65                                                   "and lowest prio\n");
  66                         return;
  67                 }
  68                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
  69                         vcpu = kvm->vcpus[i];
  70                         if (!vcpu)
  71                                 continue;
  72                         if (kvm_apic_match_physical_addr(vcpu->arch.apic,
  73                                         entry->fields.dest_id)) {
  74                                 if (vcpu->arch.apic)
  75                                         __set_bit(i, deliver_bitmask);
  76                                 break;
  77                         }
  78                 }
  79         } else if (entry->fields.dest_id != 0) /* Logical mode, MDA non-zero. */
  80                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
  81                         vcpu = kvm->vcpus[i];
  82                         if (!vcpu)
  83                                 continue;
  84                         if (vcpu->arch.apic &&
  85                             kvm_apic_match_logical_addr(vcpu->arch.apic,
  86                                         entry->fields.dest_id))
  87                                 __set_bit(i, deliver_bitmask);
  88                 }
  89
  90         switch (entry->fields.delivery_mode) {
  91         case IOAPIC_LOWEST_PRIORITY:
  92                 /* Select one in deliver_bitmask */
  93                 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
  94                                 entry->fields.vector, deliver_bitmask);
  95                 bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
  96                 if (!vcpu)
  97                         return;
  98                 __set_bit(vcpu->vcpu_id, deliver_bitmask);
  99                 break;
 100         case IOAPIC_FIXED:
 101         case IOAPIC_NMI:
 102                 break;
 103         default:
 104                 if (printk_ratelimit())
 105                         printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
 106                                 entry->fields.delivery_mode);
 107                 bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
 108         }
 109 }
 110
 111 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
 112                        struct kvm *kvm, int level)
 113 {
 114         int vcpu_id, r = -1;
 115         struct kvm_vcpu *vcpu;
 116         struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
 117         union kvm_ioapic_redirect_entry entry;
 118         DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
 119
 120         BUG_ON(!ioapic);
 121
 122         entry.bits = 0;
 123         entry.fields.dest_id = (e->msi.address_lo &
 124                         MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
 125         entry.fields.vector = (e->msi.data &
 126                         MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
 127         entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
 128                         (unsigned long *)&e->msi.address_lo);
 129         entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
 130                         (unsigned long *)&e->msi.data);
 131         entry.fields.delivery_mode = test_bit(
 132                         MSI_DATA_DELIVERY_MODE_SHIFT,
 133                         (unsigned long *)&e->msi.data);
 134
 135         /* TODO Deal with RH bit of MSI message address */
 136
 137         kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
 138
 139         if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
 140                 printk(KERN_WARNING "kvm: no destination for MSI delivery!");
 141                 return -1;
 142         }
 143         while ((vcpu_id = find_first_bit(deliver_bitmask,
 144                                         KVM_MAX_VCPUS)) < KVM_MAX_VCPUS) {
 145                 __clear_bit(vcpu_id, deliver_bitmask);
 146                 vcpu = ioapic->kvm->vcpus[vcpu_id];
 147                 if (vcpu) {
 148                         if (r < 0)
 149                                 r = 0;
 150                         r += kvm_apic_set_irq(vcpu, entry.fields.vector,
 151                                               entry.fields.dest_mode,
 152                                               entry.fields.trig_mode);
 153                 }
 154         }
 155         return r;
 156 }
 157
 158 /* This should be called with the kvm->lock mutex held
 159  * Return value:
 160  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 161  *  = 0   Interrupt was coalesced (previous irq is still pending)
 162  *  > 0   Number of CPUs interrupt was delivered to
 163  */
 164 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 165 {
 166         struct kvm_kernel_irq_routing_entry *e;
 167         unsigned long *irq_state, sig_level;
 168         int ret = -1;
 169
 170         if (irq < KVM_IOAPIC_NUM_PINS) {
 171                 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
 172
 173                 /* Logical OR for level trig interrupt */
 174                 if (level)
 175                         set_bit(irq_source_id, irq_state);
 176                 else
 177                         clear_bit(irq_source_id, irq_state);
 178                 sig_level = !!(*irq_state);
 179         } else /* Deal with MSI/MSI-X */
 180                 sig_level = 1;
 181
 182         /* Not possible to detect if the guest uses the PIC or the
 183          * IOAPIC.  So set the bit in both. The guest will ignore
 184          * writes to the unused one.
 185          */
 186         list_for_each_entry(e, &kvm->irq_routing, link)
 187                 if (e->gsi == irq) {
 188                         int r = e->set(e, kvm, sig_level);
 189                         if (r < 0)
 190                                 continue;
 191
 192                         ret = r + ((ret < 0) ? 0 : ret);
 193                 }
 194         return ret;
 195 }
 196
 197 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 198 {
 199         struct kvm_kernel_irq_routing_entry *e;
 200         struct kvm_irq_ack_notifier *kian;
 201         struct hlist_node *n;
 202         unsigned gsi = pin;
 203
 204         list_for_each_entry(e, &kvm->irq_routing, link)
 205                 if (e->irqchip.irqchip == irqchip &&
 206                     e->irqchip.pin == pin) {
 207                         gsi = e->gsi;
 208                         break;
 209                 }
 210
 211         hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
 212                 if (kian->gsi == gsi)
 213                         kian->irq_acked(kian);
 214 }
 215
 216 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 217                                    struct kvm_irq_ack_notifier *kian)
 218 {
 219         hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
 220 }
 221
 222 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
 223 {
 224         hlist_del_init(&kian->link);
 225 }
 226
 227 /* The caller must hold kvm->lock mutex */
 228 int kvm_request_irq_source_id(struct kvm *kvm)
 229 {
 230         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
 231         int irq_source_id = find_first_zero_bit(bitmap,
 232                                 sizeof(kvm->arch.irq_sources_bitmap));
 233
 234         if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 235                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
 236                 return -EFAULT;
 237         }
 238
 239         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 240         set_bit(irq_source_id, bitmap);
 241
 242         return irq_source_id;
 243 }
 244
 245 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 246 {
 247         int i;
 248
 249         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 250
 251         if (irq_source_id < 0 ||
 252             irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 253                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
 254                 return;
 255         }
 256         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
 257                 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
 258         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
 259 }
 260
 261 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 262                                     struct kvm_irq_mask_notifier *kimn)
 263 {
 264         kimn->irq = irq;
 265         hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
 266 }
 267
 268 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 269                                       struct kvm_irq_mask_notifier *kimn)
 270 {
 271         hlist_del(&kimn->link);
 272 }
 273
 274 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
 275 {
 276         struct kvm_irq_mask_notifier *kimn;
 277         struct hlist_node *n;
 278
 279         hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
 280                 if (kimn->irq == irq)
 281                         kimn->func(kimn, mask);
 282 }
 283
 284 static void __kvm_free_irq_routing(struct list_head *irq_routing)
 285 {
 286         struct kvm_kernel_irq_routing_entry *e, *n;
 287
 288         list_for_each_entry_safe(e, n, irq_routing, link)
 289                 kfree(e);
 290 }
 291
 292 void kvm_free_irq_routing(struct kvm *kvm)
 293 {
 294         __kvm_free_irq_routing(&kvm->irq_routing);
 295 }
 296
 297 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
 298                                const struct kvm_irq_routing_entry *ue)
 299 {
 300         int r = -EINVAL;
 301         int delta;
 302
 303         e->gsi = ue->gsi;
 304         switch (ue->type) {
 305         case KVM_IRQ_ROUTING_IRQCHIP:
 306                 delta = 0;
 307                 switch (ue->u.irqchip.irqchip) {
 308                 case KVM_IRQCHIP_PIC_MASTER:
 309                         e->set = kvm_set_pic_irq;
 310                         break;
 311                 case KVM_IRQCHIP_PIC_SLAVE:
 312                         e->set = kvm_set_pic_irq;
 313                         delta = 8;
 314                         break;
 315                 case KVM_IRQCHIP_IOAPIC:
 316                                 e->set = kvm_set_ioapic_irq;
 317                         break;
 318                 default:
 319                         goto out;
 320                 }
 321                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
 322                 e->irqchip.pin = ue->u.irqchip.pin + delta;
 323                 break;
 324         case KVM_IRQ_ROUTING_MSI:
 325                 e->set = kvm_set_msi;
 326                 e->msi.address_lo = ue->u.msi.address_lo;
 327                 e->msi.address_hi = ue->u.msi.address_hi;
 328                 e->msi.data = ue->u.msi.data;
 329                 break;
 330         default:
 331                 goto out;
 332         }
 333         r = 0;
 334 out:
 335         return r;
 336 }
 337
 338
 339 int kvm_set_irq_routing(struct kvm *kvm,
 340                         const struct kvm_irq_routing_entry *ue,
 341                         unsigned nr,
 342                         unsigned flags)
 343 {
 344         struct list_head irq_list = LIST_HEAD_INIT(irq_list);
 345         struct list_head tmp = LIST_HEAD_INIT(tmp);
 346         struct kvm_kernel_irq_routing_entry *e = NULL;
 347         unsigned i;
 348         int r;
 349
 350         for (i = 0; i < nr; ++i) {
 351                 r = -EINVAL;
 352                 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
 353                         goto out;
 354                 if (ue->flags)
 355                         goto out;
 356                 r = -ENOMEM;
 357                 e = kzalloc(sizeof(*e), GFP_KERNEL);
 358                 if (!e)
 359                         goto out;
 360                 r = setup_routing_entry(e, ue);
 361                 if (r)
 362                         goto out;
 363                 ++ue;
 364                 list_add(&e->link, &irq_list);
 365                 e = NULL;
 366         }
 367
 368         mutex_lock(&kvm->lock);
 369         list_splice(&kvm->irq_routing, &tmp);
 370         INIT_LIST_HEAD(&kvm->irq_routing);
 371         list_splice(&irq_list, &kvm->irq_routing);
 372         INIT_LIST_HEAD(&irq_list);
 373         list_splice(&tmp, &irq_list);
 374         mutex_unlock(&kvm->lock);
 375
 376         r = 0;
 377
 378 out:
 379         kfree(e);
 380         __kvm_free_irq_routing(&irq_list);
 381         return r;
 382 }
 383
 384 #define IOAPIC_ROUTING_ENTRY(irq) \
 385         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 386           .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
 387 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
 388
 389 #ifdef CONFIG_X86
 390 #  define PIC_ROUTING_ENTRY(irq) \
 391         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 392           .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
 393 #  define ROUTING_ENTRY2(irq) \
 394         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
 395 #else
 396 #  define ROUTING_ENTRY2(irq) \
 397         IOAPIC_ROUTING_ENTRY(irq)
 398 #endif
 399
 400 static const struct kvm_irq_routing_entry default_routing[] = {
 401         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
 402         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
 403         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
 404         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
 405         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
 406         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
 407         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
 408         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
 409         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
 410         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
 411         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
 412         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
 413 #ifdef CONFIG_IA64
 414         ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
 415         ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
 416         ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
 417         ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
 418         ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
 419         ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
 420         ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
 421         ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
 422         ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
 423         ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
 424         ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
 425         ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
 426 #endif
 427 };
 428
 429 int kvm_setup_default_irq_routing(struct kvm *kvm)
 430 {
 431         return kvm_set_irq_routing(kvm, default_routing,
 432                                    ARRAY_SIZE(default_routing), 0);
 433 }