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