virt/kvm/ioapic.c

   1 /*
   2  *  Copyright (C) 2001  MandrakeSoft S.A.
   3  *
   4  *    MandrakeSoft S.A.
   5  *    43, rue d'Aboukir
   6  *    75002 Paris - France
   7  *    http://www.linux-mandrake.com/
   8  *    http://www.mandrakesoft.com/
   9  *
  10  *  This library is free software; you can redistribute it and/or
  11  *  modify it under the terms of the GNU Lesser General Public
  12  *  License as published by the Free Software Foundation; either
  13  *  version 2 of the License, or (at your option) any later version.
  14  *
  15  *  This library is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  Lesser General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU Lesser General Public
  21  *  License along with this library; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  *  Yunhong Jiang <yunhong.jiang@intel.com>
  25  *  Yaozu (Eddie) Dong <eddie.dong@intel.com>
  26  *  Based on Xen 3.1 code.
  27  */
  28
  29 #include <linux/kvm_host.h>
  30 #include <linux/kvm.h>
  31 #include <linux/mm.h>
  32 #include <linux/highmem.h>
  33 #include <linux/smp.h>
  34 #include <linux/hrtimer.h>
  35 #include <linux/io.h>
  36 #include <asm/processor.h>
  37 #include <asm/page.h>
  38 #include <asm/current.h>
  39
  40 #include "ioapic.h"
  41 #include "lapic.h"
  42 #include "irq.h"
  43
  44 #if 0
  45 #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
  46 #else
  47 #define ioapic_debug(fmt, arg...)
  48 #endif
  49 static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
  50
  51 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
  52                                           unsigned long addr,
  53                                           unsigned long length)
  54 {
  55         unsigned long result = 0;
  56
  57         switch (ioapic->ioregsel) {
  58         case IOAPIC_REG_VERSION:
  59                 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
  60                           | (IOAPIC_VERSION_ID & 0xff));
  61                 break;
  62
  63         case IOAPIC_REG_APIC_ID:
  64         case IOAPIC_REG_ARB_ID:
  65                 result = ((ioapic->id & 0xf) << 24);
  66                 break;
  67
  68         default:
  69                 {
  70                         u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
  71                         u64 redir_content;
  72
  73                         ASSERT(redir_index < IOAPIC_NUM_PINS);
  74
  75                         redir_content = ioapic->redirtbl[redir_index].bits;
  76                         result = (ioapic->ioregsel & 0x1) ?
  77                             (redir_content >> 32) & 0xffffffff :
  78                             redir_content & 0xffffffff;
  79                         break;
  80                 }
  81         }
  82
  83         return result;
  84 }
  85
  86 static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
  87 {
  88         union ioapic_redir_entry *pent;
  89         int injected = -1;
  90
  91         pent = &ioapic->redirtbl[idx];
  92
  93         if (!pent->fields.mask) {
  94                 injected = ioapic_deliver(ioapic, idx);
  95                 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
  96                         pent->fields.remote_irr = 1;
  97         }
  98         if (!pent->fields.trig_mode)
  99                 ioapic->irr &= ~(1 << idx);
 100
 101         return injected;
 102 }
 103
 104 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 105 {
 106         unsigned index;
 107         bool mask_before, mask_after;
 108
 109         switch (ioapic->ioregsel) {
 110         case IOAPIC_REG_VERSION:
 111                 /* Writes are ignored. */
 112                 break;
 113
 114         case IOAPIC_REG_APIC_ID:
 115                 ioapic->id = (val >> 24) & 0xf;
 116                 break;
 117
 118         case IOAPIC_REG_ARB_ID:
 119                 break;
 120
 121         default:
 122                 index = (ioapic->ioregsel - 0x10) >> 1;
 123
 124                 ioapic_debug("change redir index %x val %x\n", index, val);
 125                 if (index >= IOAPIC_NUM_PINS)
 126                         return;
 127                 mask_before = ioapic->redirtbl[index].fields.mask;
 128                 if (ioapic->ioregsel & 1) {
 129                         ioapic->redirtbl[index].bits &= 0xffffffff;
 130                         ioapic->redirtbl[index].bits |= (u64) val << 32;
 131                 } else {
 132                         ioapic->redirtbl[index].bits &= ~0xffffffffULL;
 133                         ioapic->redirtbl[index].bits |= (u32) val;
 134                         ioapic->redirtbl[index].fields.remote_irr = 0;
 135                 }
 136                 mask_after = ioapic->redirtbl[index].fields.mask;
 137                 if (mask_before != mask_after)
 138                         kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
 139                 if (ioapic->irr & (1 << index))
 140                         ioapic_service(ioapic, index);
 141                 break;
 142         }
 143 }
 144
 145 static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
 146                            struct kvm_vcpu *vcpu,
 147                            u8 vector, u8 trig_mode, u8 delivery_mode)
 148 {
 149         ioapic_debug("irq %d trig %d deliv %d\n", vector, trig_mode,
 150                      delivery_mode);
 151
 152         ASSERT((delivery_mode == IOAPIC_FIXED) ||
 153                (delivery_mode == IOAPIC_LOWEST_PRIORITY));
 154
 155         return kvm_apic_set_irq(vcpu, vector, trig_mode);
 156 }
 157
 158 static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
 159 {
 160         kvm_inject_nmi(vcpu);
 161         kvm_vcpu_kick(vcpu);
 162 }
 163
 164 u32 kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 165                                     u8 dest_mode)
 166 {
 167         u32 mask = 0;
 168         int i;
 169         struct kvm *kvm = ioapic->kvm;
 170         struct kvm_vcpu *vcpu;
 171
 172         ioapic_debug("dest %d dest_mode %d\n", dest, dest_mode);
 173
 174         if (dest_mode == 0) {   /* Physical mode. */
 175                 if (dest == 0xFF) {     /* Broadcast. */
 176                         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 177                                 if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
 178                                         mask |= 1 << i;
 179                         return mask;
 180                 }
 181                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 182                         vcpu = kvm->vcpus[i];
 183                         if (!vcpu)
 184                                 continue;
 185                         if (kvm_apic_match_physical_addr(vcpu->arch.apic, dest)) {
 186                                 if (vcpu->arch.apic)
 187                                         mask = 1 << i;
 188                                 break;
 189                         }
 190                 }
 191         } else if (dest != 0)   /* Logical mode, MDA non-zero. */
 192                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 193                         vcpu = kvm->vcpus[i];
 194                         if (!vcpu)
 195                                 continue;
 196                         if (vcpu->arch.apic &&
 197                             kvm_apic_match_logical_addr(vcpu->arch.apic, dest))
 198                                 mask |= 1 << vcpu->vcpu_id;
 199                 }
 200         ioapic_debug("mask %x\n", mask);
 201         return mask;
 202 }
 203
 204 static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 205 {
 206         u8 dest = ioapic->redirtbl[irq].fields.dest_id;
 207         u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
 208         u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
 209         u8 vector = ioapic->redirtbl[irq].fields.vector;
 210         u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
 211         u32 deliver_bitmask;
 212         struct kvm_vcpu *vcpu;
 213         int vcpu_id, r = -1;
 214
 215         ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 216                      "vector=%x trig_mode=%x\n",
 217                      dest, dest_mode, delivery_mode, vector, trig_mode);
 218
 219         deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic, dest,
 220                                                           dest_mode);
 221         if (!deliver_bitmask) {
 222                 ioapic_debug("no target on destination\n");
 223                 return 0;
 224         }
 225
 226         switch (delivery_mode) {
 227         case IOAPIC_LOWEST_PRIORITY:
 228                 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
 229                                 deliver_bitmask);
 230 #ifdef CONFIG_X86
 231                 if (irq == 0)
 232                         vcpu = ioapic->kvm->vcpus[0];
 233 #endif
 234                 if (vcpu != NULL)
 235                         r = ioapic_inj_irq(ioapic, vcpu, vector,
 236                                        trig_mode, delivery_mode);
 237                 else
 238                         ioapic_debug("null lowest prio vcpu: "
 239                                      "mask=%x vector=%x delivery_mode=%x\n",
 240                                      deliver_bitmask, vector, IOAPIC_LOWEST_PRIORITY);
 241                 break;
 242         case IOAPIC_FIXED:
 243 #ifdef CONFIG_X86
 244                 if (irq == 0)
 245                         deliver_bitmask = 1;
 246 #endif
 247                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 248                         if (!(deliver_bitmask & (1 << vcpu_id)))
 249                                 continue;
 250                         deliver_bitmask &= ~(1 << vcpu_id);
 251                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 252                         if (vcpu) {
 253                                 if (r < 0)
 254                                         r = 0;
 255                                 r += ioapic_inj_irq(ioapic, vcpu, vector,
 256                                                trig_mode, delivery_mode);
 257                         }
 258                 }
 259                 break;
 260         case IOAPIC_NMI:
 261                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 262                         if (!(deliver_bitmask & (1 << vcpu_id)))
 263                                 continue;
 264                         deliver_bitmask &= ~(1 << vcpu_id);
 265                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 266                         if (vcpu) {
 267                                 ioapic_inj_nmi(vcpu);
 268                                 r = 1;
 269                         }
 270                         else
 271                                 ioapic_debug("NMI to vcpu %d failed\n",
 272                                                 vcpu->vcpu_id);
 273                 }
 274                 break;
 275         default:
 276                 printk(KERN_WARNING "Unsupported delivery mode %d\n",
 277                        delivery_mode);
 278                 break;
 279         }
 280         return r;
 281 }
 282
 283 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 284 {
 285         u32 old_irr = ioapic->irr;
 286         u32 mask = 1 << irq;
 287         union ioapic_redir_entry entry;
 288         int ret = 1;
 289
 290         if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
 291                 entry = ioapic->redirtbl[irq];
 292                 level ^= entry.fields.polarity;
 293                 if (!level)
 294                         ioapic->irr &= ~mask;
 295                 else {
 296                         ioapic->irr |= mask;
 297                         if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
 298                             || !entry.fields.remote_irr)
 299                                 ret = ioapic_service(ioapic, irq);
 300                 }
 301         }
 302         return ret;
 303 }
 304
 305 static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,
 306                                     int trigger_mode)
 307 {
 308         union ioapic_redir_entry *ent;
 309
 310         ent = &ioapic->redirtbl[pin];
 311
 312         kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin);
 313
 314         if (trigger_mode == IOAPIC_LEVEL_TRIG) {
 315                 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 316                 ent->fields.remote_irr = 0;
 317                 if (!ent->fields.mask && (ioapic->irr & (1 << pin)))
 318                         ioapic_service(ioapic, pin);
 319         }
 320 }
 321
 322 void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
 323 {
 324         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 325         int i;
 326
 327         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 328                 if (ioapic->redirtbl[i].fields.vector == vector)
 329                         __kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
 330 }
 331
 332 static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
 333                            int len, int is_write)
 334 {
 335         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 336
 337         return ((addr >= ioapic->base_address &&
 338                  (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
 339 }
 340
 341 static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
 342                              void *val)
 343 {
 344         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 345         u32 result;
 346
 347         ioapic_debug("addr %lx\n", (unsigned long)addr);
 348         ASSERT(!(addr & 0xf));  /* check alignment */
 349
 350         addr &= 0xff;
 351         switch (addr) {
 352         case IOAPIC_REG_SELECT:
 353                 result = ioapic->ioregsel;
 354                 break;
 355
 356         case IOAPIC_REG_WINDOW:
 357                 result = ioapic_read_indirect(ioapic, addr, len);
 358                 break;
 359
 360         default:
 361                 result = 0;
 362                 break;
 363         }
 364         switch (len) {
 365         case 8:
 366                 *(u64 *) val = result;
 367                 break;
 368         case 1:
 369         case 2:
 370         case 4:
 371                 memcpy(val, (char *)&result, len);
 372                 break;
 373         default:
 374                 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
 375         }
 376 }
 377
 378 static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
 379                               const void *val)
 380 {
 381         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 382         u32 data;
 383
 384         ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
 385                      (void*)addr, len, val);
 386         ASSERT(!(addr & 0xf));  /* check alignment */
 387         if (len == 4 || len == 8)
 388                 data = *(u32 *) val;
 389         else {
 390                 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
 391                 return;
 392         }
 393
 394         addr &= 0xff;
 395         switch (addr) {
 396         case IOAPIC_REG_SELECT:
 397                 ioapic->ioregsel = data;
 398                 break;
 399
 400         case IOAPIC_REG_WINDOW:
 401                 ioapic_write_indirect(ioapic, data);
 402                 break;
 403 #ifdef  CONFIG_IA64
 404         case IOAPIC_REG_EOI:
 405                 kvm_ioapic_update_eoi(ioapic->kvm, data, IOAPIC_LEVEL_TRIG);
 406                 break;
 407 #endif
 408
 409         default:
 410                 break;
 411         }
 412 }
 413
 414 void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 415 {
 416         int i;
 417
 418         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 419                 ioapic->redirtbl[i].fields.mask = 1;
 420         ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
 421         ioapic->ioregsel = 0;
 422         ioapic->irr = 0;
 423         ioapic->id = 0;
 424 }
 425
 426 int kvm_ioapic_init(struct kvm *kvm)
 427 {
 428         struct kvm_ioapic *ioapic;
 429
 430         ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
 431         if (!ioapic)
 432                 return -ENOMEM;
 433         kvm->arch.vioapic = ioapic;
 434         kvm_ioapic_reset(ioapic);
 435         ioapic->dev.read = ioapic_mmio_read;
 436         ioapic->dev.write = ioapic_mmio_write;
 437         ioapic->dev.in_range = ioapic_in_range;
 438         ioapic->dev.private = ioapic;
 439         ioapic->kvm = kvm;
 440         kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
 441         return 0;
 442 }
 443