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 struct xen_common_irq {
  44         int irq;
  45         char *name;
  46 };
  47 static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
  48 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
  49 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
  50 static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
  51 static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
  52
  53 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
  54 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
  55 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
  56
  57 /*
  58  * Reschedule call back.
  59  */
  60 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
  61 {
  62         inc_irq_stat(irq_resched_count);
  63         scheduler_ipi();
  64
  65         return IRQ_HANDLED;
  66 }
  67
  68 static void cpu_bringup(void)
  69 {
  70         int cpu;
  71
  72         cpu_init();
  73         touch_softlockup_watchdog();
  74         preempt_disable();
  75
  76         xen_enable_sysenter();
  77         xen_enable_syscall();
  78
  79         cpu = smp_processor_id();
  80         smp_store_cpu_info(cpu);
  81         cpu_data(cpu).x86_max_cores = 1;
  82         set_cpu_sibling_map(cpu);
  83
  84         xen_setup_cpu_clockevents();
  85
  86         notify_cpu_starting(cpu);
  87
  88         set_cpu_online(cpu, true);
  89
  90         this_cpu_write(cpu_state, CPU_ONLINE);
  91
  92         wmb();
  93
  94         /* We can take interrupts now: we're officially "up". */
  95         local_irq_enable();
  96
  97         wmb();                  /* make sure everything is out */
  98 }
  99
 100 static void cpu_bringup_and_idle(void)
 101 {
 102         cpu_bringup();
 103         cpu_startup_entry(CPUHP_ONLINE);
 104 }
 105
 106 static void xen_smp_intr_free(unsigned int cpu)
 107 {
 108         if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
 109                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
 110                 per_cpu(xen_resched_irq, cpu).irq = -1;
 111                 kfree(per_cpu(xen_resched_irq, cpu).name);
 112                 per_cpu(xen_resched_irq, cpu).name = NULL;
 113         }
 114         if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
 115                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
 116                 per_cpu(xen_callfunc_irq, cpu).irq = -1;
 117                 kfree(per_cpu(xen_callfunc_irq, cpu).name);
 118                 per_cpu(xen_callfunc_irq, cpu).name = NULL;
 119         }
 120         if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
 121                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
 122                 per_cpu(xen_debug_irq, cpu).irq = -1;
 123                 kfree(per_cpu(xen_debug_irq, cpu).name);
 124                 per_cpu(xen_debug_irq, cpu).name = NULL;
 125         }
 126         if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
 127                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
 128                                        NULL);
 129                 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
 130                 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
 131                 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
 132         }
 133         if (xen_hvm_domain())
 134                 return;
 135
 136         if (per_cpu(xen_irq_work, cpu).irq >= 0) {
 137                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
 138                 per_cpu(xen_irq_work, cpu).irq = -1;
 139                 kfree(per_cpu(xen_irq_work, cpu).name);
 140                 per_cpu(xen_irq_work, cpu).name = NULL;
 141         }
 142 };
 143 static int xen_smp_intr_init(unsigned int cpu)
 144 {
 145         int rc;
 146         char *resched_name, *callfunc_name, *debug_name;
 147
 148         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
 149         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 150                                     cpu,
 151                                     xen_reschedule_interrupt,
 152                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 153                                     resched_name,
 154                                     NULL);
 155         if (rc < 0)
 156                 goto fail;
 157         per_cpu(xen_resched_irq, cpu).irq = rc;
 158         per_cpu(xen_resched_irq, cpu).name = resched_name;
 159
 160         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 161         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 162                                     cpu,
 163                                     xen_call_function_interrupt,
 164                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 165                                     callfunc_name,
 166                                     NULL);
 167         if (rc < 0)
 168                 goto fail;
 169         per_cpu(xen_callfunc_irq, cpu).irq = rc;
 170         per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
 171
 172         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 173         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
 174                                      IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
 175                                      debug_name, NULL);
 176         if (rc < 0)
 177                 goto fail;
 178         per_cpu(xen_debug_irq, cpu).irq = rc;
 179         per_cpu(xen_debug_irq, cpu).name = debug_name;
 180
 181         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
 182         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
 183                                     cpu,
 184                                     xen_call_function_single_interrupt,
 185                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 186                                     callfunc_name,
 187                                     NULL);
 188         if (rc < 0)
 189                 goto fail;
 190         per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
 191         per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
 192
 193         /*
 194          * The IRQ worker on PVHVM goes through the native path and uses the
 195          * IPI mechanism.
 196          */
 197         if (xen_hvm_domain())
 198                 return 0;
 199
 200         callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
 201         rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
 202                                     cpu,
 203                                     xen_irq_work_interrupt,
 204                                     IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
 205                                     callfunc_name,
 206                                     NULL);
 207         if (rc < 0)
 208                 goto fail;
 209         per_cpu(xen_irq_work, cpu).irq = rc;
 210         per_cpu(xen_irq_work, cpu).name = callfunc_name;
 211
 212         return 0;
 213
 214  fail:
 215         xen_smp_intr_free(cpu);
 216         return rc;
 217 }
 218
 219 static void __init xen_fill_possible_map(void)
 220 {
 221         int i, rc;
 222
 223         if (xen_initial_domain())
 224                 return;
 225
 226         for (i = 0; i < nr_cpu_ids; i++) {
 227                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 228                 if (rc >= 0) {
 229                         num_processors++;
 230                         set_cpu_possible(i, true);
 231                 }
 232         }
 233 }
 234
 235 static void __init xen_filter_cpu_maps(void)
 236 {
 237         int i, rc;
 238         unsigned int subtract = 0;
 239
 240         if (!xen_initial_domain())
 241                 return;
 242
 243         num_processors = 0;
 244         disabled_cpus = 0;
 245         for (i = 0; i < nr_cpu_ids; i++) {
 246                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 247                 if (rc >= 0) {
 248                         num_processors++;
 249                         set_cpu_possible(i, true);
 250                 } else {
 251                         set_cpu_possible(i, false);
 252                         set_cpu_present(i, false);
 253                         subtract++;
 254                 }
 255         }
 256 #ifdef CONFIG_HOTPLUG_CPU
 257         /* This is akin to using 'nr_cpus' on the Linux command line.
 258          * Which is OK as when we use 'dom0_max_vcpus=X' we can only
 259          * have up to X, while nr_cpu_ids is greater than X. This
 260          * normally is not a problem, except when CPU hotplugging
 261          * is involved and then there might be more than X CPUs
 262          * in the guest - which will not work as there is no
 263          * hypercall to expand the max number of VCPUs an already
 264          * running guest has. So cap it up to X. */
 265         if (subtract)
 266                 nr_cpu_ids = nr_cpu_ids - subtract;
 267 #endif
 268
 269 }
 270
 271 static void __init xen_smp_prepare_boot_cpu(void)
 272 {
 273         BUG_ON(smp_processor_id() != 0);
 274         native_smp_prepare_boot_cpu();
 275
 276         /* We've switched to the "real" per-cpu gdt, so make sure the
 277            old memory can be recycled */
 278         make_lowmem_page_readwrite(xen_initial_gdt);
 279
 280         xen_filter_cpu_maps();
 281         xen_setup_vcpu_info_placement();
 282 }
 283
 284 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 285 {
 286         unsigned cpu;
 287         unsigned int i;
 288
 289         if (skip_ioapic_setup) {
 290                 char *m = (max_cpus == 0) ?
 291                         "The nosmp parameter is incompatible with Xen; " \
 292                         "use Xen dom0_max_vcpus=1 parameter" :
 293                         "The noapic parameter is incompatible with Xen";
 294
 295                 xen_raw_printk(m);
 296                 panic(m);
 297         }
 298         xen_init_lock_cpu(0);
 299
 300         smp_store_boot_cpu_info();
 301         cpu_data(0).x86_max_cores = 1;
 302
 303         for_each_possible_cpu(i) {
 304                 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 305                 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
 306                 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
 307         }
 308         set_cpu_sibling_map(0);
 309
 310         if (xen_smp_intr_init(0))
 311                 BUG();
 312
 313         if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
 314                 panic("could not allocate xen_cpu_initialized_map\n");
 315
 316         cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
 317
 318         /* Restrict the possible_map according to max_cpus. */
 319         while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
 320                 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
 321                         continue;
 322                 set_cpu_possible(cpu, false);
 323         }
 324
 325         for_each_possible_cpu(cpu)
 326                 set_cpu_present(cpu, true);
 327 }
 328
 329 static int
 330 cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 331 {
 332         struct vcpu_guest_context *ctxt;
 333         struct desc_struct *gdt;
 334         unsigned long gdt_mfn;
 335
 336         if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 337                 return 0;
 338
 339         ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 340         if (ctxt == NULL)
 341                 return -ENOMEM;
 342
 343         gdt = get_cpu_gdt_table(cpu);
 344
 345         ctxt->flags = VGCF_IN_KERNEL;
 346         ctxt->user_regs.ss = __KERNEL_DS;
 347 #ifdef CONFIG_X86_32
 348         ctxt->user_regs.fs = __KERNEL_PERCPU;
 349         ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 350 #else
 351         ctxt->gs_base_kernel = per_cpu_offset(cpu);
 352 #endif
 353         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
 354
 355         memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
 356
 357         {
 358                 ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
 359                 ctxt->user_regs.ds = __USER_DS;
 360                 ctxt->user_regs.es = __USER_DS;
 361
 362                 xen_copy_trap_info(ctxt->trap_ctxt);
 363
 364                 ctxt->ldt_ents = 0;
 365
 366                 BUG_ON((unsigned long)gdt & ~PAGE_MASK);
 367
 368                 gdt_mfn = arbitrary_virt_to_mfn(gdt);
 369                 make_lowmem_page_readonly(gdt);
 370                 make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 371
 372                 ctxt->gdt_frames[0] = gdt_mfn;
 373                 ctxt->gdt_ents      = GDT_ENTRIES;
 374
 375                 ctxt->kernel_ss = __KERNEL_DS;
 376                 ctxt->kernel_sp = idle->thread.sp0;
 377
 378 #ifdef CONFIG_X86_32
 379                 ctxt->event_callback_cs     = __KERNEL_CS;
 380                 ctxt->failsafe_callback_cs  = __KERNEL_CS;
 381 #endif
 382                 ctxt->event_callback_eip    =
 383                                         (unsigned long)xen_hypervisor_callback;
 384                 ctxt->failsafe_callback_eip =
 385                                         (unsigned long)xen_failsafe_callback;
 386         }
 387         ctxt->user_regs.cs = __KERNEL_CS;
 388         ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 389
 390         per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
 391         ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
 392
 393         if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
 394                 BUG();
 395
 396         kfree(ctxt);
 397         return 0;
 398 }
 399
 400 static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
 401 {
 402         int rc;
 403
 404         per_cpu(current_task, cpu) = idle;
 405 #ifdef CONFIG_X86_32
 406         irq_ctx_init(cpu);
 407 #else
 408         clear_tsk_thread_flag(idle, TIF_FORK);
 409         per_cpu(kernel_stack, cpu) =
 410                 (unsigned long)task_stack_page(idle) -
 411                 KERNEL_STACK_OFFSET + THREAD_SIZE;
 412 #endif
 413         xen_setup_runstate_info(cpu);
 414         xen_setup_timer(cpu);
 415         xen_init_lock_cpu(cpu);
 416
 417         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 418
 419         /* make sure interrupts start blocked */
 420         per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
 421
 422         rc = cpu_initialize_context(cpu, idle);
 423         if (rc)
 424                 return rc;
 425
 426         if (num_online_cpus() == 1)
 427                 /* Just in case we booted with a single CPU. */
 428                 alternatives_enable_smp();
 429
 430         rc = xen_smp_intr_init(cpu);
 431         if (rc)
 432                 return rc;
 433
 434         rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
 435         BUG_ON(rc);
 436
 437         while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
 438                 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 439                 barrier();
 440         }
 441
 442         return 0;
 443 }
 444
 445 static void xen_smp_cpus_done(unsigned int max_cpus)
 446 {
 447 }
 448
 449 #ifdef CONFIG_HOTPLUG_CPU
 450 static int xen_cpu_disable(void)
 451 {
 452         unsigned int cpu = smp_processor_id();
 453         if (cpu == 0)
 454                 return -EBUSY;
 455
 456         cpu_disable_common();
 457
 458         load_cr3(swapper_pg_dir);
 459         return 0;
 460 }
 461
 462 static void xen_cpu_die(unsigned int cpu)
 463 {
 464         while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
 465                 current->state = TASK_UNINTERRUPTIBLE;
 466                 schedule_timeout(HZ/10);
 467         }
 468         xen_smp_intr_free(cpu);
 469         xen_uninit_lock_cpu(cpu);
 470         xen_teardown_timer(cpu);
 471 }
 472
 473 static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
 474 {
 475         play_dead_common();
 476         HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
 477         cpu_bringup();
 478         /*
 479          * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
 480          * clears certain data that the cpu_idle loop (which called us
 481          * and that we return from) expects. The only way to get that
 482          * data back is to call:
 483          */
 484         tick_nohz_idle_enter();
 485 }
 486
 487 #else /* !CONFIG_HOTPLUG_CPU */
 488 static int xen_cpu_disable(void)
 489 {
 490         return -ENOSYS;
 491 }
 492
 493 static void xen_cpu_die(unsigned int cpu)
 494 {
 495         BUG();
 496 }
 497
 498 static void xen_play_dead(void)
 499 {
 500         BUG();
 501 }
 502
 503 #endif
 504 static void stop_self(void *v)
 505 {
 506         int cpu = smp_processor_id();
 507
 508         /* make sure we're not pinning something down */
 509         load_cr3(swapper_pg_dir);
 510         /* should set up a minimal gdt */
 511
 512         set_cpu_online(cpu, false);
 513
 514         HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
 515         BUG();
 516 }
 517
 518 static void xen_stop_other_cpus(int wait)
 519 {
 520         smp_call_function(stop_self, NULL, wait);
 521 }
 522
 523 static void xen_smp_send_reschedule(int cpu)
 524 {
 525         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 526 }
 527
 528 static void __xen_send_IPI_mask(const struct cpumask *mask,
 529                               int vector)
 530 {
 531         unsigned cpu;
 532
 533         for_each_cpu_and(cpu, mask, cpu_online_mask)
 534                 xen_send_IPI_one(cpu, vector);
 535 }
 536
 537 static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 538 {
 539         int cpu;
 540
 541         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 542
 543         /* Make sure other vcpus get a chance to run if they need to. */
 544         for_each_cpu(cpu, mask) {
 545                 if (xen_vcpu_stolen(cpu)) {
 546                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 547                         break;
 548                 }
 549         }
 550 }
 551
 552 static void xen_smp_send_call_function_single_ipi(int cpu)
 553 {
 554         __xen_send_IPI_mask(cpumask_of(cpu),
 555                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 556 }
 557
 558 static inline int xen_map_vector(int vector)
 559 {
 560         int xen_vector;
 561
 562         switch (vector) {
 563         case RESCHEDULE_VECTOR:
 564                 xen_vector = XEN_RESCHEDULE_VECTOR;
 565                 break;
 566         case CALL_FUNCTION_VECTOR:
 567                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
 568                 break;
 569         case CALL_FUNCTION_SINGLE_VECTOR:
 570                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
 571                 break;
 572         case IRQ_WORK_VECTOR:
 573                 xen_vector = XEN_IRQ_WORK_VECTOR;
 574                 break;
 575         default:
 576                 xen_vector = -1;
 577                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
 578                         vector);
 579         }
 580
 581         return xen_vector;
 582 }
 583
 584 void xen_send_IPI_mask(const struct cpumask *mask,
 585                               int vector)
 586 {
 587         int xen_vector = xen_map_vector(vector);
 588
 589         if (xen_vector >= 0)
 590                 __xen_send_IPI_mask(mask, xen_vector);
 591 }
 592
 593 void xen_send_IPI_all(int vector)
 594 {
 595         int xen_vector = xen_map_vector(vector);
 596
 597         if (xen_vector >= 0)
 598                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
 599 }
 600
 601 void xen_send_IPI_self(int vector)
 602 {
 603         int xen_vector = xen_map_vector(vector);
 604
 605         if (xen_vector >= 0)
 606                 xen_send_IPI_one(smp_processor_id(), xen_vector);
 607 }
 608
 609 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
 610                                 int vector)
 611 {
 612         unsigned cpu;
 613         unsigned int this_cpu = smp_processor_id();
 614         int xen_vector = xen_map_vector(vector);
 615
 616         if (!(num_online_cpus() > 1) || (xen_vector < 0))
 617                 return;
 618
 619         for_each_cpu_and(cpu, mask, cpu_online_mask) {
 620                 if (this_cpu == cpu)
 621                         continue;
 622
 623                 xen_send_IPI_one(cpu, xen_vector);
 624         }
 625 }
 626
 627 void xen_send_IPI_allbutself(int vector)
 628 {
 629         xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
 630 }
 631
 632 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 633 {
 634         irq_enter();
 635         generic_smp_call_function_interrupt();
 636         inc_irq_stat(irq_call_count);
 637         irq_exit();
 638
 639         return IRQ_HANDLED;
 640 }
 641
 642 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 643 {
 644         irq_enter();
 645         generic_smp_call_function_single_interrupt();
 646         inc_irq_stat(irq_call_count);
 647         irq_exit();
 648
 649         return IRQ_HANDLED;
 650 }
 651
 652 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 653 {
 654         irq_enter();
 655         irq_work_run();
 656         inc_irq_stat(apic_irq_work_irqs);
 657         irq_exit();
 658
 659         return IRQ_HANDLED;
 660 }
 661
 662 static const struct smp_ops xen_smp_ops __initconst = {
 663         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
 664         .smp_prepare_cpus = xen_smp_prepare_cpus,
 665         .smp_cpus_done = xen_smp_cpus_done,
 666
 667         .cpu_up = xen_cpu_up,
 668         .cpu_die = xen_cpu_die,
 669         .cpu_disable = xen_cpu_disable,
 670         .play_dead = xen_play_dead,
 671
 672         .stop_other_cpus = xen_stop_other_cpus,
 673         .smp_send_reschedule = xen_smp_send_reschedule,
 674
 675         .send_call_func_ipi = xen_smp_send_call_function_ipi,
 676         .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
 677 };
 678
 679 void __init xen_smp_init(void)
 680 {
 681         smp_ops = xen_smp_ops;
 682         xen_fill_possible_map();
 683         xen_init_spinlocks();
 684 }
 685
 686 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
 687 {
 688         native_smp_prepare_cpus(max_cpus);
 689         WARN_ON(xen_smp_intr_init(0));
 690
 691         xen_init_lock_cpu(0);
 692 }
 693
 694 static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
 695 {
 696         int rc;
 697         /*
 698          * xen_smp_intr_init() needs to run before native_cpu_up()
 699          * so that IPI vectors are set up on the booting CPU before
 700          * it is marked online in native_cpu_up().
 701         */
 702         rc = xen_smp_intr_init(cpu);
 703         WARN_ON(rc);
 704         if (!rc)
 705                 rc =  native_cpu_up(cpu, tidle);
 706         return rc;
 707 }
 708
 709 static void xen_hvm_cpu_die(unsigned int cpu)
 710 {
 711         xen_cpu_die(cpu);
 712         native_cpu_die(cpu);
 713 }
 714
 715 void __init xen_hvm_smp_init(void)
 716 {
 717         if (!xen_have_vector_callback)
 718                 return;
 719         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 720         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 721         smp_ops.cpu_up = xen_hvm_cpu_up;
 722         smp_ops.cpu_die = xen_hvm_cpu_die;
 723         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 724         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 725 }