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 void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
  87 {
  88         union ioapic_redir_entry *pent;
  89
  90         pent = &ioapic->redirtbl[idx];
  91
  92         if (!pent->fields.mask) {
  93                 int injected = ioapic_deliver(ioapic, idx);
  94                 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
  95                         pent->fields.remote_irr = 1;
  96         }
  97         if (!pent->fields.trig_mode)
  98                 ioapic->irr &= ~(1 << idx);
  99 }
 100
 101 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 102 {
 103         unsigned index;
 104
 105         switch (ioapic->ioregsel) {
 106         case IOAPIC_REG_VERSION:
 107                 /* Writes are ignored. */
 108                 break;
 109
 110         case IOAPIC_REG_APIC_ID:
 111                 ioapic->id = (val >> 24) & 0xf;
 112                 break;
 113
 114         case IOAPIC_REG_ARB_ID:
 115                 break;
 116
 117         default:
 118                 index = (ioapic->ioregsel - 0x10) >> 1;
 119
 120                 ioapic_debug("change redir index %x val %x\n", index, val);
 121                 if (index >= IOAPIC_NUM_PINS)
 122                         return;
 123                 if (ioapic->ioregsel & 1) {
 124                         ioapic->redirtbl[index].bits &= 0xffffffff;
 125                         ioapic->redirtbl[index].bits |= (u64) val << 32;
 126                 } else {
 127                         ioapic->redirtbl[index].bits &= ~0xffffffffULL;
 128                         ioapic->redirtbl[index].bits |= (u32) val;
 129                         ioapic->redirtbl[index].fields.remote_irr = 0;
 130                 }
 131                 if (ioapic->irr & (1 << index))
 132                         ioapic_service(ioapic, index);
 133                 break;
 134         }
 135 }
 136
 137 static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
 138                            struct kvm_vcpu *vcpu,
 139                            u8 vector, u8 trig_mode, u8 delivery_mode)
 140 {
 141         ioapic_debug("irq %d trig %d deliv %d\n", vector, trig_mode,
 142                      delivery_mode);
 143
 144         ASSERT((delivery_mode == IOAPIC_FIXED) ||
 145                (delivery_mode == IOAPIC_LOWEST_PRIORITY));
 146
 147         return kvm_apic_set_irq(vcpu, vector, trig_mode);
 148 }
 149
 150 static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
 151 {
 152         kvm_inject_nmi(vcpu);
 153         kvm_vcpu_kick(vcpu);
 154 }
 155
 156 static u32 ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 157                                        u8 dest_mode)
 158 {
 159         u32 mask = 0;
 160         int i;
 161         struct kvm *kvm = ioapic->kvm;
 162         struct kvm_vcpu *vcpu;
 163
 164         ioapic_debug("dest %d dest_mode %d\n", dest, dest_mode);
 165
 166         if (dest_mode == 0) {   /* Physical mode. */
 167                 if (dest == 0xFF) {     /* Broadcast. */
 168                         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 169                                 if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
 170                                         mask |= 1 << i;
 171                         return mask;
 172                 }
 173                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 174                         vcpu = kvm->vcpus[i];
 175                         if (!vcpu)
 176                                 continue;
 177                         if (kvm_apic_match_physical_addr(vcpu->arch.apic, dest)) {
 178                                 if (vcpu->arch.apic)
 179                                         mask = 1 << i;
 180                                 break;
 181                         }
 182                 }
 183         } else if (dest != 0)   /* Logical mode, MDA non-zero. */
 184                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 185                         vcpu = kvm->vcpus[i];
 186                         if (!vcpu)
 187                                 continue;
 188                         if (vcpu->arch.apic &&
 189                             kvm_apic_match_logical_addr(vcpu->arch.apic, dest))
 190                                 mask |= 1 << vcpu->vcpu_id;
 191                 }
 192         ioapic_debug("mask %x\n", mask);
 193         return mask;
 194 }
 195
 196 static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 197 {
 198         u8 dest = ioapic->redirtbl[irq].fields.dest_id;
 199         u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
 200         u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
 201         u8 vector = ioapic->redirtbl[irq].fields.vector;
 202         u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
 203         u32 deliver_bitmask;
 204         struct kvm_vcpu *vcpu;
 205         int vcpu_id, r = 0;
 206
 207         ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 208                      "vector=%x trig_mode=%x\n",
 209                      dest, dest_mode, delivery_mode, vector, trig_mode);
 210
 211         deliver_bitmask = ioapic_get_delivery_bitmask(ioapic, dest, dest_mode);
 212         if (!deliver_bitmask) {
 213                 ioapic_debug("no target on destination\n");
 214                 return 0;
 215         }
 216
 217         switch (delivery_mode) {
 218         case IOAPIC_LOWEST_PRIORITY:
 219                 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
 220                                 deliver_bitmask);
 221 #ifdef CONFIG_X86
 222                 if (irq == 0)
 223                         vcpu = ioapic->kvm->vcpus[0];
 224 #endif
 225                 if (vcpu != NULL)
 226                         r = ioapic_inj_irq(ioapic, vcpu, vector,
 227                                        trig_mode, delivery_mode);
 228                 else
 229                         ioapic_debug("null lowest prio vcpu: "
 230                                      "mask=%x vector=%x delivery_mode=%x\n",
 231                                      deliver_bitmask, vector, IOAPIC_LOWEST_PRIORITY);
 232                 break;
 233         case IOAPIC_FIXED:
 234 #ifdef CONFIG_X86
 235                 if (irq == 0)
 236                         deliver_bitmask = 1;
 237 #endif
 238                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 239                         if (!(deliver_bitmask & (1 << vcpu_id)))
 240                                 continue;
 241                         deliver_bitmask &= ~(1 << vcpu_id);
 242                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 243                         if (vcpu) {
 244                                 r = ioapic_inj_irq(ioapic, vcpu, vector,
 245                                                trig_mode, delivery_mode);
 246                         }
 247                 }
 248                 break;
 249         case IOAPIC_NMI:
 250                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 251                         if (!(deliver_bitmask & (1 << vcpu_id)))
 252                                 continue;
 253                         deliver_bitmask &= ~(1 << vcpu_id);
 254                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 255                         if (vcpu)
 256                                 ioapic_inj_nmi(vcpu);
 257                         else
 258                                 ioapic_debug("NMI to vcpu %d failed\n",
 259                                                 vcpu->vcpu_id);
 260                 }
 261                 break;
 262         default:
 263                 printk(KERN_WARNING "Unsupported delivery mode %d\n",
 264                        delivery_mode);
 265                 break;
 266         }
 267         return r;
 268 }
 269
 270 void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 271 {
 272         u32 old_irr = ioapic->irr;
 273         u32 mask = 1 << irq;
 274         union ioapic_redir_entry entry;
 275
 276         if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
 277                 entry = ioapic->redirtbl[irq];
 278                 level ^= entry.fields.polarity;
 279                 if (!level)
 280                         ioapic->irr &= ~mask;
 281                 else {
 282                         ioapic->irr |= mask;
 283                         if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
 284                             || !entry.fields.remote_irr)
 285                                 ioapic_service(ioapic, irq);
 286                 }
 287         }
 288 }
 289
 290 static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi,
 291                                     int trigger_mode)
 292 {
 293         union ioapic_redir_entry *ent;
 294
 295         ent = &ioapic->redirtbl[gsi];
 296
 297         kvm_notify_acked_irq(ioapic->kvm, gsi);
 298
 299         if (trigger_mode == IOAPIC_LEVEL_TRIG) {
 300                 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 301                 ent->fields.remote_irr = 0;
 302                 if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
 303                         ioapic_service(ioapic, gsi);
 304         }
 305 }
 306
 307 void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
 308 {
 309         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 310         int i;
 311
 312         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 313                 if (ioapic->redirtbl[i].fields.vector == vector)
 314                         __kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
 315 }
 316
 317 static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
 318                            int len, int is_write)
 319 {
 320         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 321
 322         return ((addr >= ioapic->base_address &&
 323                  (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
 324 }
 325
 326 static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
 327                              void *val)
 328 {
 329         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 330         u32 result;
 331
 332         ioapic_debug("addr %lx\n", (unsigned long)addr);
 333         ASSERT(!(addr & 0xf));  /* check alignment */
 334
 335         addr &= 0xff;
 336         switch (addr) {
 337         case IOAPIC_REG_SELECT:
 338                 result = ioapic->ioregsel;
 339                 break;
 340
 341         case IOAPIC_REG_WINDOW:
 342                 result = ioapic_read_indirect(ioapic, addr, len);
 343                 break;
 344
 345         default:
 346                 result = 0;
 347                 break;
 348         }
 349         switch (len) {
 350         case 8:
 351                 *(u64 *) val = result;
 352                 break;
 353         case 1:
 354         case 2:
 355         case 4:
 356                 memcpy(val, (char *)&result, len);
 357                 break;
 358         default:
 359                 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
 360         }
 361 }
 362
 363 static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
 364                               const void *val)
 365 {
 366         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 367         u32 data;
 368
 369         ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
 370                      (void*)addr, len, val);
 371         ASSERT(!(addr & 0xf));  /* check alignment */
 372         if (len == 4 || len == 8)
 373                 data = *(u32 *) val;
 374         else {
 375                 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
 376                 return;
 377         }
 378
 379         addr &= 0xff;
 380         switch (addr) {
 381         case IOAPIC_REG_SELECT:
 382                 ioapic->ioregsel = data;
 383                 break;
 384
 385         case IOAPIC_REG_WINDOW:
 386                 ioapic_write_indirect(ioapic, data);
 387                 break;
 388 #ifdef  CONFIG_IA64
 389         case IOAPIC_REG_EOI:
 390                 kvm_ioapic_update_eoi(ioapic->kvm, data, IOAPIC_LEVEL_TRIG);
 391                 break;
 392 #endif
 393
 394         default:
 395                 break;
 396         }
 397 }
 398
 399 void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 400 {
 401         int i;
 402
 403         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 404                 ioapic->redirtbl[i].fields.mask = 1;
 405         ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
 406         ioapic->ioregsel = 0;
 407         ioapic->irr = 0;
 408         ioapic->id = 0;
 409 }
 410
 411 int kvm_ioapic_init(struct kvm *kvm)
 412 {
 413         struct kvm_ioapic *ioapic;
 414
 415         ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
 416         if (!ioapic)
 417                 return -ENOMEM;
 418         kvm->arch.vioapic = ioapic;
 419         kvm_ioapic_reset(ioapic);
 420         ioapic->dev.read = ioapic_mmio_read;
 421         ioapic->dev.write = ioapic_mmio_write;
 422         ioapic->dev.in_range = ioapic_in_range;
 423         ioapic->dev.private = ioapic;
 424         ioapic->kvm = kvm;
 425         kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
 426         return 0;
 427 }