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 #include <linux/tick.h>
  21
  22 #include <asm/paravirt.h>
  23 #include <asm/desc.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/cpu.h>
  26
  27 #include <xen/interface/xen.h>
  28 #include <xen/interface/vcpu.h>
  29
  30 #include <asm/xen/interface.h>
  31 #include <asm/xen/hypercall.h>
  32
  33 #include <xen/xen.h>
  34 #include <xen/page.h>
  35 #include <xen/events.h>
  36
  37 #include <xen/hvc-console.h>
  38 #include "xen-ops.h"
  39 #include "mmu.h"
  40
  41 cpumask_var_t xen_cpu_initialized_map;
  42
  43 static DEFINE_PER_CPU(int, xen_resched_irq);
  44 static DEFINE_PER_CPU(int, xen_callfunc_irq);
  45 static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
  46 static DEFINE_PER_CPU(int, xen_irq_work);
  47 static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
  48
  49 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
  50 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
  51 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
  52
  53 /*
  54  * Reschedule call back.
  55  */
  56 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
  57 {
  58         inc_irq_stat(irq_resched_count);
  59         scheduler_ipi();
  60
  61         return IRQ_HANDLED;
  62 }
  63
  64 static void __cpuinit cpu_bringup(void)
  65 {
  66         int cpu;
  67
  68         cpu_init();
  69         touch_softlockup_watchdog();
  70         preempt_disable();
  71
  72         xen_enable_sysenter();
  73         xen_enable_syscall();
  74
  75         cpu = smp_processor_id();
  76         smp_store_cpu_info(cpu);
  77         cpu_data(cpu).x86_max_cores = 1;
  78         set_cpu_sibling_map(cpu);
  79
  80         xen_setup_cpu_clockevents();
  81
  82         notify_cpu_starting(cpu);
  83
  84         set_cpu_online(cpu, true);
  85
  86         this_cpu_write(cpu_state, CPU_ONLINE);
  87
  88         wmb();
  89
  90         /* We can take interrupts now: we're officially "up". */
  91         local_irq_enable();
  92
  93         wmb();                  /* make sure everything is out */
  94 }
  95
  96 static void __cpuinit cpu_bringup_and_idle(void)
  97 {
  98         cpu_bringup();
  99         cpu_startup_entry(CPUHP_ONLINE);
 100 }
 101
 102 static int xen_smp_intr_init(unsigned int cpu)
 103 {
 104         int rc;
 105         const char *resched_name, *callfunc_name, *debug_name;
 106
 107         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
 108         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 109                                     cpu,
 110                                     xen_reschedule_interrupt,
 111                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 112                                     resched_name,
 113                                     NULL);
 114         if (rc < 0)
 115                 goto fail;
 116         per_cpu(xen_resched_irq, cpu) = rc;
 117
 118         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 119         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 120                                     cpu,
 121                                     xen_call_function_interrupt,
 122                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 123                                     callfunc_name,
 124                                     NULL);
 125         if (rc < 0)
 126                 goto fail;
 127         per_cpu(xen_callfunc_irq, cpu) = rc;
 128
 129         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 130         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
 131                                      IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
 132                                      debug_name, NULL);
 133         if (rc < 0)
 134                 goto fail;
 135         per_cpu(xen_debug_irq, cpu) = rc;
 136
 137         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
 138         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
 139                                     cpu,
 140                                     xen_call_function_single_interrupt,
 141                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 142                                     callfunc_name,
 143                                     NULL);
 144         if (rc < 0)
 145                 goto fail;
 146         per_cpu(xen_callfuncsingle_irq, cpu) = rc;
 147
 148         /*
 149          * The IRQ worker on PVHVM goes through the native path and uses the
 150          * IPI mechanism.
 151          */
 152         if (xen_hvm_domain())
 153                 return 0;
 154
 155         callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
 156         rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
 157                                     cpu,
 158                                     xen_irq_work_interrupt,
 159                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 160                                     callfunc_name,
 161                                     NULL);
 162         if (rc < 0)
 163                 goto fail;
 164         per_cpu(xen_irq_work, cpu) = rc;
 165
 166         return 0;
 167
 168  fail:
 169         if (per_cpu(xen_resched_irq, cpu) >= 0)
 170                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
 171         if (per_cpu(xen_callfunc_irq, cpu) >= 0)
 172                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 173         if (per_cpu(xen_debug_irq, cpu) >= 0)
 174                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 175         if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
 176                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
 177                                        NULL);
 178         if (xen_hvm_domain())
 179                 return rc;
 180
 181         if (per_cpu(xen_irq_work, cpu) >= 0)
 182                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 183
 184         return rc;
 185 }
 186
 187 static void __init xen_fill_possible_map(void)
 188 {
 189         int i, rc;
 190
 191         if (xen_initial_domain())
 192                 return;
 193
 194         for (i = 0; i < nr_cpu_ids; i++) {
 195                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 196                 if (rc >= 0) {
 197                         num_processors++;
 198                         set_cpu_possible(i, true);
 199                 }
 200         }
 201 }
 202
 203 static void __init xen_filter_cpu_maps(void)
 204 {
 205         int i, rc;
 206         unsigned int subtract = 0;
 207
 208         if (!xen_initial_domain())
 209                 return;
 210
 211         num_processors = 0;
 212         disabled_cpus = 0;
 213         for (i = 0; i < nr_cpu_ids; i++) {
 214                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 215                 if (rc >= 0) {
 216                         num_processors++;
 217                         set_cpu_possible(i, true);
 218                 } else {
 219                         set_cpu_possible(i, false);
 220                         set_cpu_present(i, false);
 221                         subtract++;
 222                 }
 223         }
 224 #ifdef CONFIG_HOTPLUG_CPU
 225         /* This is akin to using 'nr_cpus' on the Linux command line.
 226          * Which is OK as when we use 'dom0_max_vcpus=X' we can only
 227          * have up to X, while nr_cpu_ids is greater than X. This
 228          * normally is not a problem, except when CPU hotplugging
 229          * is involved and then there might be more than X CPUs
 230          * in the guest - which will not work as there is no
 231          * hypercall to expand the max number of VCPUs an already
 232          * running guest has. So cap it up to X. */
 233         if (subtract)
 234                 nr_cpu_ids = nr_cpu_ids - subtract;
 235 #endif
 236
 237 }
 238
 239 static void __init xen_smp_prepare_boot_cpu(void)
 240 {
 241         BUG_ON(smp_processor_id() != 0);
 242         native_smp_prepare_boot_cpu();
 243
 244         /* We've switched to the "real" per-cpu gdt, so make sure the
 245            old memory can be recycled */
 246         make_lowmem_page_readwrite(xen_initial_gdt);
 247
 248         xen_filter_cpu_maps();
 249         xen_setup_vcpu_info_placement();
 250 }
 251
 252 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 253 {
 254         unsigned cpu;
 255         unsigned int i;
 256
 257         if (skip_ioapic_setup) {
 258                 char *m = (max_cpus == 0) ?
 259                         "The nosmp parameter is incompatible with Xen; " \
 260                         "use Xen dom0_max_vcpus=1 parameter" :
 261                         "The noapic parameter is incompatible with Xen";
 262
 263                 xen_raw_printk(m);
 264                 panic(m);
 265         }
 266         xen_init_lock_cpu(0);
 267
 268         smp_store_boot_cpu_info();
 269         cpu_data(0).x86_max_cores = 1;
 270
 271         for_each_possible_cpu(i) {
 272                 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 273                 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
 274                 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
 275         }
 276         set_cpu_sibling_map(0);
 277
 278         if (xen_smp_intr_init(0))
 279                 BUG();
 280
 281         if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
 282                 panic("could not allocate xen_cpu_initialized_map\n");
 283
 284         cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
 285
 286         /* Restrict the possible_map according to max_cpus. */
 287         while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
 288                 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
 289                         continue;
 290                 set_cpu_possible(cpu, false);
 291         }
 292
 293         for_each_possible_cpu(cpu)
 294                 set_cpu_present(cpu, true);
 295 }
 296
 297 static int __cpuinit
 298 cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 299 {
 300         struct vcpu_guest_context *ctxt;
 301         struct desc_struct *gdt;
 302         unsigned long gdt_mfn;
 303
 304         if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 305                 return 0;
 306
 307         ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 308         if (ctxt == NULL)
 309                 return -ENOMEM;
 310
 311         gdt = get_cpu_gdt_table(cpu);
 312
 313         ctxt->flags = VGCF_IN_KERNEL;
 314         ctxt->user_regs.ss = __KERNEL_DS;
 315 #ifdef CONFIG_X86_32
 316         ctxt->user_regs.fs = __KERNEL_PERCPU;
 317         ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 318 #else
 319         ctxt->gs_base_kernel = per_cpu_offset(cpu);
 320 #endif
 321         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
 322
 323         memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
 324
 325         {
 326                 ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
 327                 ctxt->user_regs.ds = __USER_DS;
 328                 ctxt->user_regs.es = __USER_DS;
 329
 330                 xen_copy_trap_info(ctxt->trap_ctxt);
 331
 332                 ctxt->ldt_ents = 0;
 333
 334                 BUG_ON((unsigned long)gdt & ~PAGE_MASK);
 335
 336                 gdt_mfn = arbitrary_virt_to_mfn(gdt);
 337                 make_lowmem_page_readonly(gdt);
 338                 make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 339
 340                 ctxt->gdt_frames[0] = gdt_mfn;
 341                 ctxt->gdt_ents      = GDT_ENTRIES;
 342
 343                 ctxt->kernel_ss = __KERNEL_DS;
 344                 ctxt->kernel_sp = idle->thread.sp0;
 345
 346 #ifdef CONFIG_X86_32
 347                 ctxt->event_callback_cs     = __KERNEL_CS;
 348                 ctxt->failsafe_callback_cs  = __KERNEL_CS;
 349 #endif
 350                 ctxt->event_callback_eip    =
 351                                         (unsigned long)xen_hypervisor_callback;
 352                 ctxt->failsafe_callback_eip =
 353                                         (unsigned long)xen_failsafe_callback;
 354         }
 355         ctxt->user_regs.cs = __KERNEL_CS;
 356         ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 357
 358         per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
 359         ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
 360
 361         if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
 362                 BUG();
 363
 364         kfree(ctxt);
 365         return 0;
 366 }
 367
 368 static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
 369 {
 370         int rc;
 371
 372         per_cpu(current_task, cpu) = idle;
 373 #ifdef CONFIG_X86_32
 374         irq_ctx_init(cpu);
 375 #else
 376         clear_tsk_thread_flag(idle, TIF_FORK);
 377         per_cpu(kernel_stack, cpu) =
 378                 (unsigned long)task_stack_page(idle) -
 379                 KERNEL_STACK_OFFSET + THREAD_SIZE;
 380 #endif
 381         xen_setup_runstate_info(cpu);
 382         xen_setup_timer(cpu);
 383         xen_init_lock_cpu(cpu);
 384
 385         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 386
 387         /* make sure interrupts start blocked */
 388         per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
 389
 390         rc = cpu_initialize_context(cpu, idle);
 391         if (rc)
 392                 return rc;
 393
 394         if (num_online_cpus() == 1)
 395                 /* Just in case we booted with a single CPU. */
 396                 alternatives_enable_smp();
 397
 398         rc = xen_smp_intr_init(cpu);
 399         if (rc)
 400                 return rc;
 401
 402         rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
 403         BUG_ON(rc);
 404
 405         while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
 406                 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 407                 barrier();
 408         }
 409
 410         return 0;
 411 }
 412
 413 static void xen_smp_cpus_done(unsigned int max_cpus)
 414 {
 415 }
 416
 417 #ifdef CONFIG_HOTPLUG_CPU
 418 static int xen_cpu_disable(void)
 419 {
 420         unsigned int cpu = smp_processor_id();
 421         if (cpu == 0)
 422                 return -EBUSY;
 423
 424         cpu_disable_common();
 425
 426         load_cr3(swapper_pg_dir);
 427         return 0;
 428 }
 429
 430 static void xen_cpu_die(unsigned int cpu)
 431 {
 432         while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
 433                 current->state = TASK_UNINTERRUPTIBLE;
 434                 schedule_timeout(HZ/10);
 435         }
 436         unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
 437         unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 438         unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 439         unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
 440         if (!xen_hvm_domain())
 441                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 442         xen_uninit_lock_cpu(cpu);
 443         xen_teardown_timer(cpu);
 444 }
 445
 446 static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
 447 {
 448         play_dead_common();
 449         HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
 450         cpu_bringup();
 451         /*
 452          * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
 453          * clears certain data that the cpu_idle loop (which called us
 454          * and that we return from) expects. The only way to get that
 455          * data back is to call:
 456          */
 457         tick_nohz_idle_enter();
 458 }
 459
 460 #else /* !CONFIG_HOTPLUG_CPU */
 461 static int xen_cpu_disable(void)
 462 {
 463         return -ENOSYS;
 464 }
 465
 466 static void xen_cpu_die(unsigned int cpu)
 467 {
 468         BUG();
 469 }
 470
 471 static void xen_play_dead(void)
 472 {
 473         BUG();
 474 }
 475
 476 #endif
 477 static void stop_self(void *v)
 478 {
 479         int cpu = smp_processor_id();
 480
 481         /* make sure we're not pinning something down */
 482         load_cr3(swapper_pg_dir);
 483         /* should set up a minimal gdt */
 484
 485         set_cpu_online(cpu, false);
 486
 487         HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
 488         BUG();
 489 }
 490
 491 static void xen_stop_other_cpus(int wait)
 492 {
 493         smp_call_function(stop_self, NULL, wait);
 494 }
 495
 496 static void xen_smp_send_reschedule(int cpu)
 497 {
 498         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 499 }
 500
 501 static void __xen_send_IPI_mask(const struct cpumask *mask,
 502                               int vector)
 503 {
 504         unsigned cpu;
 505
 506         for_each_cpu_and(cpu, mask, cpu_online_mask)
 507                 xen_send_IPI_one(cpu, vector);
 508 }
 509
 510 static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 511 {
 512         int cpu;
 513
 514         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 515
 516         /* Make sure other vcpus get a chance to run if they need to. */
 517         for_each_cpu(cpu, mask) {
 518                 if (xen_vcpu_stolen(cpu)) {
 519                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 520                         break;
 521                 }
 522         }
 523 }
 524
 525 static void xen_smp_send_call_function_single_ipi(int cpu)
 526 {
 527         __xen_send_IPI_mask(cpumask_of(cpu),
 528                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 529 }
 530
 531 static inline int xen_map_vector(int vector)
 532 {
 533         int xen_vector;
 534
 535         switch (vector) {
 536         case RESCHEDULE_VECTOR:
 537                 xen_vector = XEN_RESCHEDULE_VECTOR;
 538                 break;
 539         case CALL_FUNCTION_VECTOR:
 540                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
 541                 break;
 542         case CALL_FUNCTION_SINGLE_VECTOR:
 543                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
 544                 break;
 545         case IRQ_WORK_VECTOR:
 546                 xen_vector = XEN_IRQ_WORK_VECTOR;
 547                 break;
 548         default:
 549                 xen_vector = -1;
 550                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
 551                         vector);
 552         }
 553
 554         return xen_vector;
 555 }
 556
 557 void xen_send_IPI_mask(const struct cpumask *mask,
 558                               int vector)
 559 {
 560         int xen_vector = xen_map_vector(vector);
 561
 562         if (xen_vector >= 0)
 563                 __xen_send_IPI_mask(mask, xen_vector);
 564 }
 565
 566 void xen_send_IPI_all(int vector)
 567 {
 568         int xen_vector = xen_map_vector(vector);
 569
 570         if (xen_vector >= 0)
 571                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
 572 }
 573
 574 void xen_send_IPI_self(int vector)
 575 {
 576         int xen_vector = xen_map_vector(vector);
 577
 578         if (xen_vector >= 0)
 579                 xen_send_IPI_one(smp_processor_id(), xen_vector);
 580 }
 581
 582 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
 583                                 int vector)
 584 {
 585         unsigned cpu;
 586         unsigned int this_cpu = smp_processor_id();
 587         int xen_vector = xen_map_vector(vector);
 588
 589         if (!(num_online_cpus() > 1) || (xen_vector < 0))
 590                 return;
 591
 592         for_each_cpu_and(cpu, mask, cpu_online_mask) {
 593                 if (this_cpu == cpu)
 594                         continue;
 595
 596                 xen_send_IPI_one(cpu, xen_vector);
 597         }
 598 }
 599
 600 void xen_send_IPI_allbutself(int vector)
 601 {
 602         xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
 603 }
 604
 605 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 606 {
 607         irq_enter();
 608         generic_smp_call_function_interrupt();
 609         inc_irq_stat(irq_call_count);
 610         irq_exit();
 611
 612         return IRQ_HANDLED;
 613 }
 614
 615 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 616 {
 617         irq_enter();
 618         generic_smp_call_function_single_interrupt();
 619         inc_irq_stat(irq_call_count);
 620         irq_exit();
 621
 622         return IRQ_HANDLED;
 623 }
 624
 625 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 626 {
 627         irq_enter();
 628         irq_work_run();
 629         inc_irq_stat(apic_irq_work_irqs);
 630         irq_exit();
 631
 632         return IRQ_HANDLED;
 633 }
 634
 635 static const struct smp_ops xen_smp_ops __initconst = {
 636         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
 637         .smp_prepare_cpus = xen_smp_prepare_cpus,
 638         .smp_cpus_done = xen_smp_cpus_done,
 639
 640         .cpu_up = xen_cpu_up,
 641         .cpu_die = xen_cpu_die,
 642         .cpu_disable = xen_cpu_disable,
 643         .play_dead = xen_play_dead,
 644
 645         .stop_other_cpus = xen_stop_other_cpus,
 646         .smp_send_reschedule = xen_smp_send_reschedule,
 647
 648         .send_call_func_ipi = xen_smp_send_call_function_ipi,
 649         .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
 650 };
 651
 652 void __init xen_smp_init(void)
 653 {
 654         smp_ops = xen_smp_ops;
 655         xen_fill_possible_map();
 656         xen_init_spinlocks();
 657 }
 658
 659 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
 660 {
 661         native_smp_prepare_cpus(max_cpus);
 662         WARN_ON(xen_smp_intr_init(0));
 663
 664         xen_init_lock_cpu(0);
 665 }
 666
 667 static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
 668 {
 669         int rc;
 670         rc = native_cpu_up(cpu, tidle);
 671         WARN_ON (xen_smp_intr_init(cpu));
 672         return rc;
 673 }
 674
 675 static void xen_hvm_cpu_die(unsigned int cpu)
 676 {
 677         xen_cpu_die(cpu);
 678         native_cpu_die(cpu);
 679 }
 680
 681 void __init xen_hvm_smp_init(void)
 682 {
 683         if (!xen_have_vector_callback)
 684                 return;
 685         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 686         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 687         smp_ops.cpu_up = xen_hvm_cpu_up;
 688         smp_ops.cpu_die = xen_hvm_cpu_die;
 689         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 690         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 691 }