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