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 #include <linux/nmi.h>
  22
  23 #include <asm/paravirt.h>
  24 #include <asm/desc.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/cpu.h>
  27
  28 #include <xen/interface/xen.h>
  29 #include <xen/interface/vcpu.h>
  30 #include <xen/interface/xenpmu.h>
  31
  32 #include <asm/xen/interface.h>
  33 #include <asm/xen/hypercall.h>
  34
  35 #include <xen/xen.h>
  36 #include <xen/page.h>
  37 #include <xen/events.h>
  38
  39 #include <xen/hvc-console.h>
  40 #include "xen-ops.h"
  41 #include "mmu.h"
  42 #include "smp.h"
  43 #include "pmu.h"
  44
  45 cpumask_var_t xen_cpu_initialized_map;
  46
  47 struct xen_common_irq {
  48         int irq;
  49         char *name;
  50 };
  51 static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
  52 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
  53 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
  54 static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
  55 static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
  56 static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
  57
  58 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
  59 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
  60 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
  61
  62 /*
  63  * Reschedule call back.
  64  */
  65 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
  66 {
  67         inc_irq_stat(irq_resched_count);
  68         scheduler_ipi();
  69
  70         return IRQ_HANDLED;
  71 }
  72
  73 static void cpu_bringup(void)
  74 {
  75         int cpu;
  76
  77         cpu_init();
  78         touch_softlockup_watchdog();
  79         preempt_disable();
  80
  81         /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
  82         if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
  83                 xen_enable_sysenter();
  84                 xen_enable_syscall();
  85         }
  86         cpu = smp_processor_id();
  87         smp_store_cpu_info(cpu);
  88         cpu_data(cpu).x86_max_cores = 1;
  89         set_cpu_sibling_map(cpu);
  90
  91         xen_setup_cpu_clockevents();
  92
  93         notify_cpu_starting(cpu);
  94
  95         set_cpu_online(cpu, true);
  96
  97         cpu_set_state_online(cpu);  /* Implies full memory barrier. */
  98
  99         /* We can take interrupts now: we're officially "up". */
 100         local_irq_enable();
 101 }
 102
 103 asmlinkage __visible void cpu_bringup_and_idle(void)
 104 {
 105         cpu_bringup();
 106         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 107 }
 108
 109 void xen_smp_intr_free(unsigned int cpu)
 110 {
 111         if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
 112                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
 113                 per_cpu(xen_resched_irq, cpu).irq = -1;
 114                 kfree(per_cpu(xen_resched_irq, cpu).name);
 115                 per_cpu(xen_resched_irq, cpu).name = NULL;
 116         }
 117         if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
 118                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
 119                 per_cpu(xen_callfunc_irq, cpu).irq = -1;
 120                 kfree(per_cpu(xen_callfunc_irq, cpu).name);
 121                 per_cpu(xen_callfunc_irq, cpu).name = NULL;
 122         }
 123         if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
 124                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
 125                 per_cpu(xen_debug_irq, cpu).irq = -1;
 126                 kfree(per_cpu(xen_debug_irq, cpu).name);
 127                 per_cpu(xen_debug_irq, cpu).name = NULL;
 128         }
 129         if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
 130                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
 131                                        NULL);
 132                 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
 133                 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
 134                 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
 135         }
 136         if (xen_hvm_domain())
 137                 return;
 138
 139         if (per_cpu(xen_irq_work, cpu).irq >= 0) {
 140                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
 141                 per_cpu(xen_irq_work, cpu).irq = -1;
 142                 kfree(per_cpu(xen_irq_work, cpu).name);
 143                 per_cpu(xen_irq_work, cpu).name = NULL;
 144         }
 145
 146         if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
 147                 unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
 148                 per_cpu(xen_pmu_irq, cpu).irq = -1;
 149                 kfree(per_cpu(xen_pmu_irq, cpu).name);
 150                 per_cpu(xen_pmu_irq, cpu).name = NULL;
 151         }
 152 };
 153 int xen_smp_intr_init(unsigned int cpu)
 154 {
 155         int rc;
 156         char *resched_name, *callfunc_name, *debug_name, *pmu_name;
 157
 158         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
 159         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 160                                     cpu,
 161                                     xen_reschedule_interrupt,
 162                                     IRQF_PERCPU|IRQF_NOBALANCING,
 163                                     resched_name,
 164                                     NULL);
 165         if (rc < 0)
 166                 goto fail;
 167         per_cpu(xen_resched_irq, cpu).irq = rc;
 168         per_cpu(xen_resched_irq, cpu).name = resched_name;
 169
 170         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 171         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 172                                     cpu,
 173                                     xen_call_function_interrupt,
 174                                     IRQF_PERCPU|IRQF_NOBALANCING,
 175                                     callfunc_name,
 176                                     NULL);
 177         if (rc < 0)
 178                 goto fail;
 179         per_cpu(xen_callfunc_irq, cpu).irq = rc;
 180         per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
 181
 182         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 183         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
 184                                      IRQF_PERCPU | IRQF_NOBALANCING,
 185                                      debug_name, NULL);
 186         if (rc < 0)
 187                 goto fail;
 188         per_cpu(xen_debug_irq, cpu).irq = rc;
 189         per_cpu(xen_debug_irq, cpu).name = debug_name;
 190
 191         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
 192         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
 193                                     cpu,
 194                                     xen_call_function_single_interrupt,
 195                                     IRQF_PERCPU|IRQF_NOBALANCING,
 196                                     callfunc_name,
 197                                     NULL);
 198         if (rc < 0)
 199                 goto fail;
 200         per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
 201         per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
 202
 203         /*
 204          * The IRQ worker on PVHVM goes through the native path and uses the
 205          * IPI mechanism.
 206          */
 207         if (xen_hvm_domain())
 208                 return 0;
 209
 210         callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
 211         rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
 212                                     cpu,
 213                                     xen_irq_work_interrupt,
 214                                     IRQF_PERCPU|IRQF_NOBALANCING,
 215                                     callfunc_name,
 216                                     NULL);
 217         if (rc < 0)
 218                 goto fail;
 219         per_cpu(xen_irq_work, cpu).irq = rc;
 220         per_cpu(xen_irq_work, cpu).name = callfunc_name;
 221
 222         if (is_xen_pmu(cpu)) {
 223                 pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
 224                 rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
 225                                              xen_pmu_irq_handler,
 226                                              IRQF_PERCPU|IRQF_NOBALANCING,
 227                                              pmu_name, NULL);
 228                 if (rc < 0)
 229                         goto fail;
 230                 per_cpu(xen_pmu_irq, cpu).irq = rc;
 231                 per_cpu(xen_pmu_irq, cpu).name = pmu_name;
 232         }
 233
 234         return 0;
 235
 236  fail:
 237         xen_smp_intr_free(cpu);
 238         return rc;
 239 }
 240
 241 static void __init xen_fill_possible_map(void)
 242 {
 243         int i, rc;
 244
 245         if (xen_initial_domain())
 246                 return;
 247
 248         for (i = 0; i < nr_cpu_ids; i++) {
 249                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 250                 if (rc >= 0) {
 251                         num_processors++;
 252                         set_cpu_possible(i, true);
 253                 }
 254         }
 255 }
 256
 257 static void __init xen_filter_cpu_maps(void)
 258 {
 259         int i, rc;
 260         unsigned int subtract = 0;
 261
 262         if (!xen_initial_domain())
 263                 return;
 264
 265         num_processors = 0;
 266         disabled_cpus = 0;
 267         for (i = 0; i < nr_cpu_ids; i++) {
 268                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 269                 if (rc >= 0) {
 270                         num_processors++;
 271                         set_cpu_possible(i, true);
 272                 } else {
 273                         set_cpu_possible(i, false);
 274                         set_cpu_present(i, false);
 275                         subtract++;
 276                 }
 277         }
 278 #ifdef CONFIG_HOTPLUG_CPU
 279         /* This is akin to using 'nr_cpus' on the Linux command line.
 280          * Which is OK as when we use 'dom0_max_vcpus=X' we can only
 281          * have up to X, while nr_cpu_ids is greater than X. This
 282          * normally is not a problem, except when CPU hotplugging
 283          * is involved and then there might be more than X CPUs
 284          * in the guest - which will not work as there is no
 285          * hypercall to expand the max number of VCPUs an already
 286          * running guest has. So cap it up to X. */
 287         if (subtract)
 288                 nr_cpu_ids = nr_cpu_ids - subtract;
 289 #endif
 290
 291 }
 292
 293 static void __init xen_smp_prepare_boot_cpu(void)
 294 {
 295         BUG_ON(smp_processor_id() != 0);
 296         native_smp_prepare_boot_cpu();
 297
 298         if (xen_pv_domain()) {
 299                 if (!xen_feature(XENFEAT_writable_page_tables))
 300                         /* We've switched to the "real" per-cpu gdt, so make
 301                          * sure the old memory can be recycled. */
 302                         make_lowmem_page_readwrite(xen_initial_gdt);
 303
 304 #ifdef CONFIG_X86_32
 305                 /*
 306                  * Xen starts us with XEN_FLAT_RING1_DS, but linux code
 307                  * expects __USER_DS
 308                  */
 309                 loadsegment(ds, __USER_DS);
 310                 loadsegment(es, __USER_DS);
 311 #endif
 312
 313                 xen_filter_cpu_maps();
 314                 xen_setup_vcpu_info_placement();
 315         }
 316
 317         /*
 318          * Setup vcpu_info for boot CPU.
 319          */
 320         if (xen_hvm_domain())
 321                 xen_vcpu_setup(0);
 322
 323         /*
 324          * The alternative logic (which patches the unlock/lock) runs before
 325          * the smp bootup up code is activated. Hence we need to set this up
 326          * the core kernel is being patched. Otherwise we will have only
 327          * modules patched but not core code.
 328          */
 329         xen_init_spinlocks();
 330 }
 331
 332 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 333 {
 334         unsigned cpu;
 335         unsigned int i;
 336
 337         if (skip_ioapic_setup) {
 338                 char *m = (max_cpus == 0) ?
 339                         "The nosmp parameter is incompatible with Xen; " \
 340                         "use Xen dom0_max_vcpus=1 parameter" :
 341                         "The noapic parameter is incompatible with Xen";
 342
 343                 xen_raw_printk(m);
 344                 panic(m);
 345         }
 346         xen_init_lock_cpu(0);
 347
 348         smp_store_boot_cpu_info();
 349         cpu_data(0).x86_max_cores = 1;
 350
 351         for_each_possible_cpu(i) {
 352                 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 353                 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
 354                 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
 355         }
 356         set_cpu_sibling_map(0);
 357
 358         xen_pmu_init(0);
 359
 360         if (xen_smp_intr_init(0))
 361                 BUG();
 362
 363         if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
 364                 panic("could not allocate xen_cpu_initialized_map\n");
 365
 366         cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
 367
 368         /* Restrict the possible_map according to max_cpus. */
 369         while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
 370                 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
 371                         continue;
 372                 set_cpu_possible(cpu, false);
 373         }
 374
 375         for_each_possible_cpu(cpu)
 376                 set_cpu_present(cpu, true);
 377 }
 378
 379 static int
 380 cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 381 {
 382         struct vcpu_guest_context *ctxt;
 383         struct desc_struct *gdt;
 384         unsigned long gdt_mfn;
 385
 386         /* used to tell cpu_init() that it can proceed with initialization */
 387         cpumask_set_cpu(cpu, cpu_callout_mask);
 388         if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 389                 return 0;
 390
 391         ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 392         if (ctxt == NULL)
 393                 return -ENOMEM;
 394
 395         gdt = get_cpu_gdt_table(cpu);
 396
 397 #ifdef CONFIG_X86_32
 398         ctxt->user_regs.fs = __KERNEL_PERCPU;
 399         ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 400 #endif
 401         memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
 402
 403         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
 404         ctxt->flags = VGCF_IN_KERNEL;
 405         ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
 406         ctxt->user_regs.ds = __USER_DS;
 407         ctxt->user_regs.es = __USER_DS;
 408         ctxt->user_regs.ss = __KERNEL_DS;
 409
 410         xen_copy_trap_info(ctxt->trap_ctxt);
 411
 412         ctxt->ldt_ents = 0;
 413
 414         BUG_ON((unsigned long)gdt & ~PAGE_MASK);
 415
 416         gdt_mfn = arbitrary_virt_to_mfn(gdt);
 417         make_lowmem_page_readonly(gdt);
 418         make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 419
 420         ctxt->gdt_frames[0] = gdt_mfn;
 421         ctxt->gdt_ents      = GDT_ENTRIES;
 422
 423         ctxt->kernel_ss = __KERNEL_DS;
 424         ctxt->kernel_sp = idle->thread.sp0;
 425
 426 #ifdef CONFIG_X86_32
 427         ctxt->event_callback_cs     = __KERNEL_CS;
 428         ctxt->failsafe_callback_cs  = __KERNEL_CS;
 429 #else
 430         ctxt->gs_base_kernel = per_cpu_offset(cpu);
 431 #endif
 432         ctxt->event_callback_eip    =
 433                 (unsigned long)xen_hypervisor_callback;
 434         ctxt->failsafe_callback_eip =
 435                 (unsigned long)xen_failsafe_callback;
 436         ctxt->user_regs.cs = __KERNEL_CS;
 437         per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
 438
 439         ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 440         ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
 441         if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
 442                 BUG();
 443
 444         kfree(ctxt);
 445         return 0;
 446 }
 447
 448 static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
 449 {
 450         int rc;
 451
 452         common_cpu_up(cpu, idle);
 453
 454         xen_setup_runstate_info(cpu);
 455
 456         /*
 457          * PV VCPUs are always successfully taken down (see 'while' loop
 458          * in xen_cpu_die()), so -EBUSY is an error.
 459          */
 460         rc = cpu_check_up_prepare(cpu);
 461         if (rc)
 462                 return rc;
 463
 464         /* make sure interrupts start blocked */
 465         per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
 466
 467         rc = cpu_initialize_context(cpu, idle);
 468         if (rc)
 469                 return rc;
 470
 471         xen_pmu_init(cpu);
 472
 473         rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
 474         BUG_ON(rc);
 475
 476         while (cpu_report_state(cpu) != CPU_ONLINE)
 477                 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 478
 479         return 0;
 480 }
 481
 482 static void xen_smp_cpus_done(unsigned int max_cpus)
 483 {
 484 }
 485
 486 #ifdef CONFIG_HOTPLUG_CPU
 487 static int xen_cpu_disable(void)
 488 {
 489         unsigned int cpu = smp_processor_id();
 490         if (cpu == 0)
 491                 return -EBUSY;
 492
 493         cpu_disable_common();
 494
 495         load_cr3(swapper_pg_dir);
 496         return 0;
 497 }
 498
 499 static void xen_cpu_die(unsigned int cpu)
 500 {
 501         while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up,
 502                                                      xen_vcpu_nr(cpu), NULL)) {
 503                 __set_current_state(TASK_UNINTERRUPTIBLE);
 504                 schedule_timeout(HZ/10);
 505         }
 506
 507         if (common_cpu_die(cpu) == 0) {
 508                 xen_smp_intr_free(cpu);
 509                 xen_uninit_lock_cpu(cpu);
 510                 xen_teardown_timer(cpu);
 511                 xen_pmu_finish(cpu);
 512         }
 513 }
 514
 515 static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
 516 {
 517         play_dead_common();
 518         HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
 519         cpu_bringup();
 520         /*
 521          * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
 522          * clears certain data that the cpu_idle loop (which called us
 523          * and that we return from) expects. The only way to get that
 524          * data back is to call:
 525          */
 526         tick_nohz_idle_enter();
 527
 528         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 529 }
 530
 531 #else /* !CONFIG_HOTPLUG_CPU */
 532 static int xen_cpu_disable(void)
 533 {
 534         return -ENOSYS;
 535 }
 536
 537 static void xen_cpu_die(unsigned int cpu)
 538 {
 539         BUG();
 540 }
 541
 542 static void xen_play_dead(void)
 543 {
 544         BUG();
 545 }
 546
 547 #endif
 548 static void stop_self(void *v)
 549 {
 550         int cpu = smp_processor_id();
 551
 552         /* make sure we're not pinning something down */
 553         load_cr3(swapper_pg_dir);
 554         /* should set up a minimal gdt */
 555
 556         set_cpu_online(cpu, false);
 557
 558         HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
 559         BUG();
 560 }
 561
 562 static void xen_stop_other_cpus(int wait)
 563 {
 564         smp_call_function(stop_self, NULL, wait);
 565 }
 566
 567 static void xen_smp_send_reschedule(int cpu)
 568 {
 569         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 570 }
 571
 572 static void __xen_send_IPI_mask(const struct cpumask *mask,
 573                               int vector)
 574 {
 575         unsigned cpu;
 576
 577         for_each_cpu_and(cpu, mask, cpu_online_mask)
 578                 xen_send_IPI_one(cpu, vector);
 579 }
 580
 581 static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 582 {
 583         int cpu;
 584
 585         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 586
 587         /* Make sure other vcpus get a chance to run if they need to. */
 588         for_each_cpu(cpu, mask) {
 589                 if (xen_vcpu_stolen(cpu)) {
 590                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 591                         break;
 592                 }
 593         }
 594 }
 595
 596 static void xen_smp_send_call_function_single_ipi(int cpu)
 597 {
 598         __xen_send_IPI_mask(cpumask_of(cpu),
 599                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 600 }
 601
 602 static inline int xen_map_vector(int vector)
 603 {
 604         int xen_vector;
 605
 606         switch (vector) {
 607         case RESCHEDULE_VECTOR:
 608                 xen_vector = XEN_RESCHEDULE_VECTOR;
 609                 break;
 610         case CALL_FUNCTION_VECTOR:
 611                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
 612                 break;
 613         case CALL_FUNCTION_SINGLE_VECTOR:
 614                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
 615                 break;
 616         case IRQ_WORK_VECTOR:
 617                 xen_vector = XEN_IRQ_WORK_VECTOR;
 618                 break;
 619 #ifdef CONFIG_X86_64
 620         case NMI_VECTOR:
 621         case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
 622                 xen_vector = XEN_NMI_VECTOR;
 623                 break;
 624 #endif
 625         default:
 626                 xen_vector = -1;
 627                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
 628                         vector);
 629         }
 630
 631         return xen_vector;
 632 }
 633
 634 void xen_send_IPI_mask(const struct cpumask *mask,
 635                               int vector)
 636 {
 637         int xen_vector = xen_map_vector(vector);
 638
 639         if (xen_vector >= 0)
 640                 __xen_send_IPI_mask(mask, xen_vector);
 641 }
 642
 643 void xen_send_IPI_all(int vector)
 644 {
 645         int xen_vector = xen_map_vector(vector);
 646
 647         if (xen_vector >= 0)
 648                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
 649 }
 650
 651 void xen_send_IPI_self(int vector)
 652 {
 653         int xen_vector = xen_map_vector(vector);
 654
 655         if (xen_vector >= 0)
 656                 xen_send_IPI_one(smp_processor_id(), xen_vector);
 657 }
 658
 659 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
 660                                 int vector)
 661 {
 662         unsigned cpu;
 663         unsigned int this_cpu = smp_processor_id();
 664         int xen_vector = xen_map_vector(vector);
 665
 666         if (!(num_online_cpus() > 1) || (xen_vector < 0))
 667                 return;
 668
 669         for_each_cpu_and(cpu, mask, cpu_online_mask) {
 670                 if (this_cpu == cpu)
 671                         continue;
 672
 673                 xen_send_IPI_one(cpu, xen_vector);
 674         }
 675 }
 676
 677 void xen_send_IPI_allbutself(int vector)
 678 {
 679         xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
 680 }
 681
 682 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 683 {
 684         irq_enter();
 685         generic_smp_call_function_interrupt();
 686         inc_irq_stat(irq_call_count);
 687         irq_exit();
 688
 689         return IRQ_HANDLED;
 690 }
 691
 692 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 693 {
 694         irq_enter();
 695         generic_smp_call_function_single_interrupt();
 696         inc_irq_stat(irq_call_count);
 697         irq_exit();
 698
 699         return IRQ_HANDLED;
 700 }
 701
 702 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 703 {
 704         irq_enter();
 705         irq_work_run();
 706         inc_irq_stat(apic_irq_work_irqs);
 707         irq_exit();
 708
 709         return IRQ_HANDLED;
 710 }
 711
 712 static const struct smp_ops xen_smp_ops __initconst = {
 713         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
 714         .smp_prepare_cpus = xen_smp_prepare_cpus,
 715         .smp_cpus_done = xen_smp_cpus_done,
 716
 717         .cpu_up = xen_cpu_up,
 718         .cpu_die = xen_cpu_die,
 719         .cpu_disable = xen_cpu_disable,
 720         .play_dead = xen_play_dead,
 721
 722         .stop_other_cpus = xen_stop_other_cpus,
 723         .smp_send_reschedule = xen_smp_send_reschedule,
 724
 725         .send_call_func_ipi = xen_smp_send_call_function_ipi,
 726         .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
 727 };
 728
 729 void __init xen_smp_init(void)
 730 {
 731         smp_ops = xen_smp_ops;
 732         xen_fill_possible_map();
 733 }
 734
 735 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
 736 {
 737         native_smp_prepare_cpus(max_cpus);
 738         WARN_ON(xen_smp_intr_init(0));
 739
 740         xen_init_lock_cpu(0);
 741 }
 742
 743 void __init xen_hvm_smp_init(void)
 744 {
 745         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 746         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 747         smp_ops.cpu_die = xen_cpu_die;
 748         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 749         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 750         smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
 751 }