arch/x86/xen/smp.c

   1 /*
   2  * Xen SMP support
   3  *
   4  * This file implements the Xen versions of smp_ops.  SMP under Xen is
   5  * very straightforward.  Bringing a CPU up is simply a matter of
   6  * loading its initial context and setting it running.
   7  *
   8  * IPIs are handled through the Xen event mechanism.
   9  *
  10  * Because virtual CPUs can be scheduled onto any real CPU, there's no
  11  * useful topology information for the kernel to make use of.  As a
  12  * result, all CPUs are treated as if they're single-core and
  13  * single-threaded.
  14  */
  15 #include <linux/sched.h>
  16 #include <linux/err.h>
  17 #include <linux/slab.h>
  18 #include <linux/smp.h>
  19 #include <linux/irq_work.h>
  20
  21 #include <asm/paravirt.h>
  22 #include <asm/desc.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/cpu.h>
  25
  26 #include <xen/interface/xen.h>
  27 #include <xen/interface/vcpu.h>
  28
  29 #include <asm/xen/interface.h>
  30 #include <asm/xen/hypercall.h>
  31
  32 #include <xen/xen.h>
  33 #include <xen/page.h>
  34 #include <xen/events.h>
  35
  36 #include <xen/hvc-console.h>
  37 #include "xen-ops.h"
  38 #include "mmu.h"
  39
  40 cpumask_var_t xen_cpu_initialized_map;
  41
  42 static DEFINE_PER_CPU(int, xen_resched_irq);
  43 static DEFINE_PER_CPU(int, xen_callfunc_irq);
  44 static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
  45 static DEFINE_PER_CPU(int, xen_irq_work);
  46 static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
  47
  48 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
  49 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
  50 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
  51
  52 /*
  53  * Reschedule call back.
  54  */
  55 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
  56 {
  57         inc_irq_stat(irq_resched_count);
  58         scheduler_ipi();
  59
  60         return IRQ_HANDLED;
  61 }
  62
  63 static void __cpuinit cpu_bringup(void)
  64 {
  65         int cpu;
  66
  67         cpu_init();
  68         touch_softlockup_watchdog();
  69         preempt_disable();
  70
  71         xen_enable_sysenter();
  72         xen_enable_syscall();
  73
  74         cpu = smp_processor_id();
  75         smp_store_cpu_info(cpu);
  76         cpu_data(cpu).x86_max_cores = 1;
  77         set_cpu_sibling_map(cpu);
  78
  79         xen_setup_cpu_clockevents();
  80
  81         notify_cpu_starting(cpu);
  82
  83         ipi_call_lock();
  84         set_cpu_online(cpu, true);
  85         ipi_call_unlock();
  86
  87         this_cpu_write(cpu_state, CPU_ONLINE);
  88
  89         wmb();
  90
  91         /* We can take interrupts now: we're officially "up". */
  92         local_irq_enable();
  93
  94         wmb();                  /* make sure everything is out */
  95 }
  96
  97 static void __cpuinit cpu_bringup_and_idle(void)
  98 {
  99         cpu_bringup();
 100         cpu_idle();
 101 }
 102
 103 static int xen_smp_intr_init(unsigned int cpu)
 104 {
 105         int rc;
 106         const char *resched_name, *callfunc_name, *debug_name;
 107
 108         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
 109         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 110                                     cpu,
 111                                     xen_reschedule_interrupt,
 112                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 113                                     resched_name,
 114                                     NULL);
 115         if (rc < 0)
 116                 goto fail;
 117         per_cpu(xen_resched_irq, cpu) = rc;
 118
 119         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 120         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 121                                     cpu,
 122                                     xen_call_function_interrupt,
 123                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 124                                     callfunc_name,
 125                                     NULL);
 126         if (rc < 0)
 127                 goto fail;
 128         per_cpu(xen_callfunc_irq, cpu) = rc;
 129
 130         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 131         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
 132                                      IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
 133                                      debug_name, NULL);
 134         if (rc < 0)
 135                 goto fail;
 136         per_cpu(xen_debug_irq, cpu) = rc;
 137
 138         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
 139         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
 140                                     cpu,
 141                                     xen_call_function_single_interrupt,
 142                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 143                                     callfunc_name,
 144                                     NULL);
 145         if (rc < 0)
 146                 goto fail;
 147         per_cpu(xen_callfuncsingle_irq, cpu) = rc;
 148
 149         callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
 150         rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
 151                                     cpu,
 152                                     xen_irq_work_interrupt,
 153                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 154                                     callfunc_name,
 155                                     NULL);
 156         if (rc < 0)
 157                 goto fail;
 158         per_cpu(xen_irq_work, cpu) = rc;
 159
 160         return 0;
 161
 162  fail:
 163         if (per_cpu(xen_resched_irq, cpu) >= 0)
 164                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
 165         if (per_cpu(xen_callfunc_irq, cpu) >= 0)
 166                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 167         if (per_cpu(xen_debug_irq, cpu) >= 0)
 168                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 169         if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
 170                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
 171                                        NULL);
 172         if (per_cpu(xen_irq_work, cpu) >= 0)
 173                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 174
 175         return rc;
 176 }
 177
 178 static void __init xen_fill_possible_map(void)
 179 {
 180         int i, rc;
 181
 182         if (xen_initial_domain())
 183                 return;
 184
 185         for (i = 0; i < nr_cpu_ids; i++) {
 186                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 187                 if (rc >= 0) {
 188                         num_processors++;
 189                         set_cpu_possible(i, true);
 190                 }
 191         }
 192 }
 193
 194 static void __init xen_filter_cpu_maps(void)
 195 {
 196         int i, rc;
 197         unsigned int subtract = 0;
 198
 199         if (!xen_initial_domain())
 200                 return;
 201
 202         num_processors = 0;
 203         disabled_cpus = 0;
 204         for (i = 0; i < nr_cpu_ids; i++) {
 205                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 206                 if (rc >= 0) {
 207                         num_processors++;
 208                         set_cpu_possible(i, true);
 209                 } else {
 210                         set_cpu_possible(i, false);
 211                         set_cpu_present(i, false);
 212                         subtract++;
 213                 }
 214         }
 215 #ifdef CONFIG_HOTPLUG_CPU
 216         /* This is akin to using 'nr_cpus' on the Linux command line.
 217          * Which is OK as when we use 'dom0_max_vcpus=X' we can only
 218          * have up to X, while nr_cpu_ids is greater than X. This
 219          * normally is not a problem, except when CPU hotplugging
 220          * is involved and then there might be more than X CPUs
 221          * in the guest - which will not work as there is no
 222          * hypercall to expand the max number of VCPUs an already
 223          * running guest has. So cap it up to X. */
 224         if (subtract)
 225                 nr_cpu_ids = nr_cpu_ids - subtract;
 226 #endif
 227
 228 }
 229
 230 static void __init xen_smp_prepare_boot_cpu(void)
 231 {
 232         BUG_ON(smp_processor_id() != 0);
 233         native_smp_prepare_boot_cpu();
 234
 235         /* We've switched to the "real" per-cpu gdt, so make sure the
 236            old memory can be recycled */
 237         make_lowmem_page_readwrite(xen_initial_gdt);
 238
 239         xen_filter_cpu_maps();
 240         xen_setup_vcpu_info_placement();
 241 }
 242
 243 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 244 {
 245         unsigned cpu;
 246         unsigned int i;
 247
 248         if (skip_ioapic_setup) {
 249                 char *m = (max_cpus == 0) ?
 250                         "The nosmp parameter is incompatible with Xen; " \
 251                         "use Xen dom0_max_vcpus=1 parameter" :
 252                         "The noapic parameter is incompatible with Xen";
 253
 254                 xen_raw_printk(m);
 255                 panic(m);
 256         }
 257         xen_init_lock_cpu(0);
 258
 259         smp_store_cpu_info(0);
 260         cpu_data(0).x86_max_cores = 1;
 261
 262         for_each_possible_cpu(i) {
 263                 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 264                 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
 265                 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
 266         }
 267         set_cpu_sibling_map(0);
 268
 269         if (xen_smp_intr_init(0))
 270                 BUG();
 271
 272         if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
 273                 panic("could not allocate xen_cpu_initialized_map\n");
 274
 275         cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
 276
 277         /* Restrict the possible_map according to max_cpus. */
 278         while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
 279                 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
 280                         continue;
 281                 set_cpu_possible(cpu, false);
 282         }
 283
 284         for_each_possible_cpu(cpu)
 285                 set_cpu_present(cpu, true);
 286 }
 287
 288 static int __cpuinit
 289 cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 290 {
 291         struct vcpu_guest_context *ctxt;
 292         struct desc_struct *gdt;
 293         unsigned long gdt_mfn;
 294
 295         if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 296                 return 0;
 297
 298         ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 299         if (ctxt == NULL)
 300                 return -ENOMEM;
 301
 302         gdt = get_cpu_gdt_table(cpu);
 303
 304         ctxt->flags = VGCF_IN_KERNEL;
 305         ctxt->user_regs.ds = __USER_DS;
 306         ctxt->user_regs.es = __USER_DS;
 307         ctxt->user_regs.ss = __KERNEL_DS;
 308 #ifdef CONFIG_X86_32
 309         ctxt->user_regs.fs = __KERNEL_PERCPU;
 310         ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 311 #else
 312         ctxt->gs_base_kernel = per_cpu_offset(cpu);
 313 #endif
 314         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
 315         ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
 316
 317         memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
 318
 319         xen_copy_trap_info(ctxt->trap_ctxt);
 320
 321         ctxt->ldt_ents = 0;
 322
 323         BUG_ON((unsigned long)gdt & ~PAGE_MASK);
 324
 325         gdt_mfn = arbitrary_virt_to_mfn(gdt);
 326         make_lowmem_page_readonly(gdt);
 327         make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 328
 329         ctxt->gdt_frames[0] = gdt_mfn;
 330         ctxt->gdt_ents      = GDT_ENTRIES;
 331
 332         ctxt->user_regs.cs = __KERNEL_CS;
 333         ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 334
 335         ctxt->kernel_ss = __KERNEL_DS;
 336         ctxt->kernel_sp = idle->thread.sp0;
 337
 338 #ifdef CONFIG_X86_32
 339         ctxt->event_callback_cs     = __KERNEL_CS;
 340         ctxt->failsafe_callback_cs  = __KERNEL_CS;
 341 #endif
 342         ctxt->event_callback_eip    = (unsigned long)xen_hypervisor_callback;
 343         ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
 344
 345         per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
 346         ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
 347
 348         if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
 349                 BUG();
 350
 351         kfree(ctxt);
 352         return 0;
 353 }
 354
 355 static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
 356 {
 357         int rc;
 358
 359         per_cpu(current_task, cpu) = idle;
 360 #ifdef CONFIG_X86_32
 361         irq_ctx_init(cpu);
 362 #else
 363         clear_tsk_thread_flag(idle, TIF_FORK);
 364         per_cpu(kernel_stack, cpu) =
 365                 (unsigned long)task_stack_page(idle) -
 366                 KERNEL_STACK_OFFSET + THREAD_SIZE;
 367 #endif
 368         xen_setup_runstate_info(cpu);
 369         xen_setup_timer(cpu);
 370         xen_init_lock_cpu(cpu);
 371
 372         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 373
 374         /* make sure interrupts start blocked */
 375         per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
 376
 377         rc = cpu_initialize_context(cpu, idle);
 378         if (rc)
 379                 return rc;
 380
 381         if (num_online_cpus() == 1)
 382                 alternatives_smp_switch(1);
 383
 384         rc = xen_smp_intr_init(cpu);
 385         if (rc)
 386                 return rc;
 387
 388         rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
 389         BUG_ON(rc);
 390
 391         while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
 392                 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 393                 barrier();
 394         }
 395
 396         return 0;
 397 }
 398
 399 static void xen_smp_cpus_done(unsigned int max_cpus)
 400 {
 401 }
 402
 403 #ifdef CONFIG_HOTPLUG_CPU
 404 static int xen_cpu_disable(void)
 405 {
 406         unsigned int cpu = smp_processor_id();
 407         if (cpu == 0)
 408                 return -EBUSY;
 409
 410         cpu_disable_common();
 411
 412         load_cr3(swapper_pg_dir);
 413         return 0;
 414 }
 415
 416 static void xen_cpu_die(unsigned int cpu)
 417 {
 418         while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
 419                 current->state = TASK_UNINTERRUPTIBLE;
 420                 schedule_timeout(HZ/10);
 421         }
 422         unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
 423         unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 424         unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 425         unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
 426         unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 427         xen_uninit_lock_cpu(cpu);
 428         xen_teardown_timer(cpu);
 429
 430         if (num_online_cpus() == 1)
 431                 alternatives_smp_switch(0);
 432 }
 433
 434 static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
 435 {
 436         play_dead_common();
 437         HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
 438         cpu_bringup();
 439         /*
 440          * Balance out the preempt calls - as we are running in cpu_idle
 441          * loop which has been called at bootup from cpu_bringup_and_idle.
 442          * The cpucpu_bringup_and_idle called cpu_bringup which made a
 443          * preempt_disable() So this preempt_enable will balance it out.
 444          */
 445         preempt_enable();
 446 }
 447
 448 #else /* !CONFIG_HOTPLUG_CPU */
 449 static int xen_cpu_disable(void)
 450 {
 451         return -ENOSYS;
 452 }
 453
 454 static void xen_cpu_die(unsigned int cpu)
 455 {
 456         BUG();
 457 }
 458
 459 static void xen_play_dead(void)
 460 {
 461         BUG();
 462 }
 463
 464 #endif
 465 static void stop_self(void *v)
 466 {
 467         int cpu = smp_processor_id();
 468
 469         /* make sure we're not pinning something down */
 470         load_cr3(swapper_pg_dir);
 471         /* should set up a minimal gdt */
 472
 473         set_cpu_online(cpu, false);
 474
 475         HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
 476         BUG();
 477 }
 478
 479 static void xen_stop_other_cpus(int wait)
 480 {
 481         smp_call_function(stop_self, NULL, wait);
 482 }
 483
 484 static void xen_smp_send_reschedule(int cpu)
 485 {
 486         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 487 }
 488
 489 static void __xen_send_IPI_mask(const struct cpumask *mask,
 490                               int vector)
 491 {
 492         unsigned cpu;
 493
 494         for_each_cpu_and(cpu, mask, cpu_online_mask)
 495                 xen_send_IPI_one(cpu, vector);
 496 }
 497
 498 static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 499 {
 500         int cpu;
 501
 502         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 503
 504         /* Make sure other vcpus get a chance to run if they need to. */
 505         for_each_cpu(cpu, mask) {
 506                 if (xen_vcpu_stolen(cpu)) {
 507                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 508                         break;
 509                 }
 510         }
 511 }
 512
 513 static void xen_smp_send_call_function_single_ipi(int cpu)
 514 {
 515         __xen_send_IPI_mask(cpumask_of(cpu),
 516                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 517 }
 518
 519 static inline int xen_map_vector(int vector)
 520 {
 521         int xen_vector;
 522
 523         switch (vector) {
 524         case RESCHEDULE_VECTOR:
 525                 xen_vector = XEN_RESCHEDULE_VECTOR;
 526                 break;
 527         case CALL_FUNCTION_VECTOR:
 528                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
 529                 break;
 530         case CALL_FUNCTION_SINGLE_VECTOR:
 531                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
 532                 break;
 533         case IRQ_WORK_VECTOR:
 534                 xen_vector = XEN_IRQ_WORK_VECTOR;
 535                 break;
 536         default:
 537                 xen_vector = -1;
 538                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
 539                         vector);
 540         }
 541
 542         return xen_vector;
 543 }
 544
 545 void xen_send_IPI_mask(const struct cpumask *mask,
 546                               int vector)
 547 {
 548         int xen_vector = xen_map_vector(vector);
 549
 550         if (xen_vector >= 0)
 551                 __xen_send_IPI_mask(mask, xen_vector);
 552 }
 553
 554 void xen_send_IPI_all(int vector)
 555 {
 556         int xen_vector = xen_map_vector(vector);
 557
 558         if (xen_vector >= 0)
 559                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
 560 }
 561
 562 void xen_send_IPI_self(int vector)
 563 {
 564         int xen_vector = xen_map_vector(vector);
 565
 566         if (xen_vector >= 0)
 567                 xen_send_IPI_one(smp_processor_id(), xen_vector);
 568 }
 569
 570 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
 571                                 int vector)
 572 {
 573         unsigned cpu;
 574         unsigned int this_cpu = smp_processor_id();
 575
 576         if (!(num_online_cpus() > 1))
 577                 return;
 578
 579         for_each_cpu_and(cpu, mask, cpu_online_mask) {
 580                 if (this_cpu == cpu)
 581                         continue;
 582
 583                 xen_smp_send_call_function_single_ipi(cpu);
 584         }
 585 }
 586
 587 void xen_send_IPI_allbutself(int vector)
 588 {
 589         int xen_vector = xen_map_vector(vector);
 590
 591         if (xen_vector >= 0)
 592                 xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
 593 }
 594
 595 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 596 {
 597         irq_enter();
 598         generic_smp_call_function_interrupt();
 599         inc_irq_stat(irq_call_count);
 600         irq_exit();
 601
 602         return IRQ_HANDLED;
 603 }
 604
 605 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 606 {
 607         irq_enter();
 608         generic_smp_call_function_single_interrupt();
 609         inc_irq_stat(irq_call_count);
 610         irq_exit();
 611
 612         return IRQ_HANDLED;
 613 }
 614
 615 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 616 {
 617         irq_enter();
 618         irq_work_run();
 619         inc_irq_stat(apic_irq_work_irqs);
 620         irq_exit();
 621
 622         return IRQ_HANDLED;
 623 }
 624
 625 static const struct smp_ops xen_smp_ops __initconst = {
 626         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
 627         .smp_prepare_cpus = xen_smp_prepare_cpus,
 628         .smp_cpus_done = xen_smp_cpus_done,
 629
 630         .cpu_up = xen_cpu_up,
 631         .cpu_die = xen_cpu_die,
 632         .cpu_disable = xen_cpu_disable,
 633         .play_dead = xen_play_dead,
 634
 635         .stop_other_cpus = xen_stop_other_cpus,
 636         .smp_send_reschedule = xen_smp_send_reschedule,
 637
 638         .send_call_func_ipi = xen_smp_send_call_function_ipi,
 639         .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
 640 };
 641
 642 void __init xen_smp_init(void)
 643 {
 644         smp_ops = xen_smp_ops;
 645         xen_fill_possible_map();
 646         xen_init_spinlocks();
 647 }
 648
 649 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
 650 {
 651         native_smp_prepare_cpus(max_cpus);
 652         WARN_ON(xen_smp_intr_init(0));
 653
 654         xen_init_lock_cpu(0);
 655 }
 656
 657 static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
 658 {
 659         int rc;
 660         rc = native_cpu_up(cpu, tidle);
 661         WARN_ON (xen_smp_intr_init(cpu));
 662         return rc;
 663 }
 664
 665 static void xen_hvm_cpu_die(unsigned int cpu)
 666 {
 667         unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
 668         unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 669         unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 670         unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
 671         unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 672         native_cpu_die(cpu);
 673 }
 674
 675 void __init xen_hvm_smp_init(void)
 676 {
 677         if (!xen_have_vector_callback)
 678                 return;
 679         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 680         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 681         smp_ops.cpu_up = xen_hvm_cpu_up;
 682         smp_ops.cpu_die = xen_hvm_cpu_die;
 683         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 684         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 685 }