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         /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
  77         if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
  78                 xen_enable_sysenter();
  79                 xen_enable_syscall();
  80         }
  81         cpu = smp_processor_id();
  82         smp_store_cpu_info(cpu);
  83         cpu_data(cpu).x86_max_cores = 1;
  84         set_cpu_sibling_map(cpu);
  85
  86         xen_setup_cpu_clockevents();
  87
  88         notify_cpu_starting(cpu);
  89
  90         set_cpu_online(cpu, true);
  91
  92         this_cpu_write(cpu_state, CPU_ONLINE);
  93
  94         wmb();
  95
  96         /* We can take interrupts now: we're officially "up". */
  97         local_irq_enable();
  98
  99         wmb();                  /* make sure everything is out */
 100 }
 101
 102 /* Note: cpu parameter is only relevant for PVH */
 103 static void cpu_bringup_and_idle(int cpu)
 104 {
 105 #ifdef CONFIG_X86_64
 106         if (xen_feature(XENFEAT_auto_translated_physmap) &&
 107             xen_feature(XENFEAT_supervisor_mode_kernel))
 108                 xen_pvh_secondary_vcpu_init(cpu);
 109 #endif
 110         cpu_bringup();
 111         cpu_startup_entry(CPUHP_ONLINE);
 112 }
 113
 114 static void xen_smp_intr_free(unsigned int cpu)
 115 {
 116         if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
 117                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
 118                 per_cpu(xen_resched_irq, cpu).irq = -1;
 119                 kfree(per_cpu(xen_resched_irq, cpu).name);
 120                 per_cpu(xen_resched_irq, cpu).name = NULL;
 121         }
 122         if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
 123                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
 124                 per_cpu(xen_callfunc_irq, cpu).irq = -1;
 125                 kfree(per_cpu(xen_callfunc_irq, cpu).name);
 126                 per_cpu(xen_callfunc_irq, cpu).name = NULL;
 127         }
 128         if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
 129                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
 130                 per_cpu(xen_debug_irq, cpu).irq = -1;
 131                 kfree(per_cpu(xen_debug_irq, cpu).name);
 132                 per_cpu(xen_debug_irq, cpu).name = NULL;
 133         }
 134         if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
 135                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
 136                                        NULL);
 137                 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
 138                 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
 139                 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
 140         }
 141         if (xen_hvm_domain())
 142                 return;
 143
 144         if (per_cpu(xen_irq_work, cpu).irq >= 0) {
 145                 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
 146                 per_cpu(xen_irq_work, cpu).irq = -1;
 147                 kfree(per_cpu(xen_irq_work, cpu).name);
 148                 per_cpu(xen_irq_work, cpu).name = NULL;
 149         }
 150 };
 151 static int xen_smp_intr_init(unsigned int cpu)
 152 {
 153         int rc;
 154         char *resched_name, *callfunc_name, *debug_name;
 155
 156         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
 157         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 158                                     cpu,
 159                                     xen_reschedule_interrupt,
 160                                     IRQF_PERCPU|IRQF_NOBALANCING,
 161                                     resched_name,
 162                                     NULL);
 163         if (rc < 0)
 164                 goto fail;
 165         per_cpu(xen_resched_irq, cpu).irq = rc;
 166         per_cpu(xen_resched_irq, cpu).name = resched_name;
 167
 168         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 169         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 170                                     cpu,
 171                                     xen_call_function_interrupt,
 172                                     IRQF_PERCPU|IRQF_NOBALANCING,
 173                                     callfunc_name,
 174                                     NULL);
 175         if (rc < 0)
 176                 goto fail;
 177         per_cpu(xen_callfunc_irq, cpu).irq = rc;
 178         per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
 179
 180         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 181         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
 182                                      IRQF_PERCPU | IRQF_NOBALANCING,
 183                                      debug_name, NULL);
 184         if (rc < 0)
 185                 goto fail;
 186         per_cpu(xen_debug_irq, cpu).irq = rc;
 187         per_cpu(xen_debug_irq, cpu).name = debug_name;
 188
 189         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
 190         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
 191                                     cpu,
 192                                     xen_call_function_single_interrupt,
 193                                     IRQF_PERCPU|IRQF_NOBALANCING,
 194                                     callfunc_name,
 195                                     NULL);
 196         if (rc < 0)
 197                 goto fail;
 198         per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
 199         per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
 200
 201         /*
 202          * The IRQ worker on PVHVM goes through the native path and uses the
 203          * IPI mechanism.
 204          */
 205         if (xen_hvm_domain())
 206                 return 0;
 207
 208         callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
 209         rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
 210                                     cpu,
 211                                     xen_irq_work_interrupt,
 212                                     IRQF_PERCPU|IRQF_NOBALANCING,
 213                                     callfunc_name,
 214                                     NULL);
 215         if (rc < 0)
 216                 goto fail;
 217         per_cpu(xen_irq_work, cpu).irq = rc;
 218         per_cpu(xen_irq_work, cpu).name = callfunc_name;
 219
 220         return 0;
 221
 222  fail:
 223         xen_smp_intr_free(cpu);
 224         return rc;
 225 }
 226
 227 static void __init xen_fill_possible_map(void)
 228 {
 229         int i, rc;
 230
 231         if (xen_initial_domain())
 232                 return;
 233
 234         for (i = 0; i < nr_cpu_ids; i++) {
 235                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 236                 if (rc >= 0) {
 237                         num_processors++;
 238                         set_cpu_possible(i, true);
 239                 }
 240         }
 241 }
 242
 243 static void __init xen_filter_cpu_maps(void)
 244 {
 245         int i, rc;
 246         unsigned int subtract = 0;
 247
 248         if (!xen_initial_domain())
 249                 return;
 250
 251         num_processors = 0;
 252         disabled_cpus = 0;
 253         for (i = 0; i < nr_cpu_ids; i++) {
 254                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
 255                 if (rc >= 0) {
 256                         num_processors++;
 257                         set_cpu_possible(i, true);
 258                 } else {
 259                         set_cpu_possible(i, false);
 260                         set_cpu_present(i, false);
 261                         subtract++;
 262                 }
 263         }
 264 #ifdef CONFIG_HOTPLUG_CPU
 265         /* This is akin to using 'nr_cpus' on the Linux command line.
 266          * Which is OK as when we use 'dom0_max_vcpus=X' we can only
 267          * have up to X, while nr_cpu_ids is greater than X. This
 268          * normally is not a problem, except when CPU hotplugging
 269          * is involved and then there might be more than X CPUs
 270          * in the guest - which will not work as there is no
 271          * hypercall to expand the max number of VCPUs an already
 272          * running guest has. So cap it up to X. */
 273         if (subtract)
 274                 nr_cpu_ids = nr_cpu_ids - subtract;
 275 #endif
 276
 277 }
 278
 279 static void __init xen_smp_prepare_boot_cpu(void)
 280 {
 281         BUG_ON(smp_processor_id() != 0);
 282         native_smp_prepare_boot_cpu();
 283
 284         if (xen_pv_domain()) {
 285                 if (!xen_feature(XENFEAT_writable_page_tables))
 286                         /* We've switched to the "real" per-cpu gdt, so make
 287                          * sure the old memory can be recycled. */
 288                         make_lowmem_page_readwrite(xen_initial_gdt);
 289
 290 #ifdef CONFIG_X86_32
 291                 /*
 292                  * Xen starts us with XEN_FLAT_RING1_DS, but linux code
 293                  * expects __USER_DS
 294                  */
 295                 loadsegment(ds, __USER_DS);
 296                 loadsegment(es, __USER_DS);
 297 #endif
 298
 299                 xen_filter_cpu_maps();
 300                 xen_setup_vcpu_info_placement();
 301         }
 302         /*
 303          * The alternative logic (which patches the unlock/lock) runs before
 304          * the smp bootup up code is activated. Hence we need to set this up
 305          * the core kernel is being patched. Otherwise we will have only
 306          * modules patched but not core code.
 307          */
 308         xen_init_spinlocks();
 309 }
 310
 311 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 312 {
 313         unsigned cpu;
 314         unsigned int i;
 315
 316         if (skip_ioapic_setup) {
 317                 char *m = (max_cpus == 0) ?
 318                         "The nosmp parameter is incompatible with Xen; " \
 319                         "use Xen dom0_max_vcpus=1 parameter" :
 320                         "The noapic parameter is incompatible with Xen";
 321
 322                 xen_raw_printk(m);
 323                 panic(m);
 324         }
 325         xen_init_lock_cpu(0);
 326
 327         smp_store_boot_cpu_info();
 328         cpu_data(0).x86_max_cores = 1;
 329
 330         for_each_possible_cpu(i) {
 331                 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 332                 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
 333                 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
 334         }
 335         set_cpu_sibling_map(0);
 336
 337         if (xen_smp_intr_init(0))
 338                 BUG();
 339
 340         if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
 341                 panic("could not allocate xen_cpu_initialized_map\n");
 342
 343         cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
 344
 345         /* Restrict the possible_map according to max_cpus. */
 346         while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
 347                 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
 348                         continue;
 349                 set_cpu_possible(cpu, false);
 350         }
 351
 352         for_each_possible_cpu(cpu)
 353                 set_cpu_present(cpu, true);
 354 }
 355
 356 static int
 357 cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 358 {
 359         struct vcpu_guest_context *ctxt;
 360         struct desc_struct *gdt;
 361         unsigned long gdt_mfn;
 362
 363         if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 364                 return 0;
 365
 366         ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 367         if (ctxt == NULL)
 368                 return -ENOMEM;
 369
 370         gdt = get_cpu_gdt_table(cpu);
 371
 372 #ifdef CONFIG_X86_32
 373         /* Note: PVH is not yet supported on x86_32. */
 374         ctxt->user_regs.fs = __KERNEL_PERCPU;
 375         ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 376 #endif
 377         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
 378
 379         memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
 380
 381         if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 382                 ctxt->flags = VGCF_IN_KERNEL;
 383                 ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
 384                 ctxt->user_regs.ds = __USER_DS;
 385                 ctxt->user_regs.es = __USER_DS;
 386                 ctxt->user_regs.ss = __KERNEL_DS;
 387
 388                 xen_copy_trap_info(ctxt->trap_ctxt);
 389
 390                 ctxt->ldt_ents = 0;
 391
 392                 BUG_ON((unsigned long)gdt & ~PAGE_MASK);
 393
 394                 gdt_mfn = arbitrary_virt_to_mfn(gdt);
 395                 make_lowmem_page_readonly(gdt);
 396                 make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 397
 398                 ctxt->gdt_frames[0] = gdt_mfn;
 399                 ctxt->gdt_ents      = GDT_ENTRIES;
 400
 401                 ctxt->kernel_ss = __KERNEL_DS;
 402                 ctxt->kernel_sp = idle->thread.sp0;
 403
 404 #ifdef CONFIG_X86_32
 405                 ctxt->event_callback_cs     = __KERNEL_CS;
 406                 ctxt->failsafe_callback_cs  = __KERNEL_CS;
 407 #else
 408                 ctxt->gs_base_kernel = per_cpu_offset(cpu);
 409 #endif
 410                 ctxt->event_callback_eip    =
 411                                         (unsigned long)xen_hypervisor_callback;
 412                 ctxt->failsafe_callback_eip =
 413                                         (unsigned long)xen_failsafe_callback;
 414                 ctxt->user_regs.cs = __KERNEL_CS;
 415                 per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
 416 #ifdef CONFIG_X86_32
 417         }
 418 #else
 419         } else
 420                 /* N.B. The user_regs.eip (cpu_bringup_and_idle) is called with
 421                  * %rdi having the cpu number - which means are passing in
 422                  * as the first parameter the cpu. Subtle!
 423                  */
 424                 ctxt->user_regs.rdi = cpu;
 425 #endif
 426         ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 427         ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
 428         if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
 429                 BUG();
 430
 431         kfree(ctxt);
 432         return 0;
 433 }
 434
 435 static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
 436 {
 437         int rc;
 438
 439         per_cpu(current_task, cpu) = idle;
 440 #ifdef CONFIG_X86_32
 441         irq_ctx_init(cpu);
 442 #else
 443         clear_tsk_thread_flag(idle, TIF_FORK);
 444 #endif
 445         per_cpu(kernel_stack, cpu) =
 446                 (unsigned long)task_stack_page(idle) -
 447                 KERNEL_STACK_OFFSET + THREAD_SIZE;
 448
 449         xen_setup_runstate_info(cpu);
 450         xen_setup_timer(cpu);
 451         xen_init_lock_cpu(cpu);
 452
 453         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 454
 455         /* make sure interrupts start blocked */
 456         per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
 457
 458         rc = cpu_initialize_context(cpu, idle);
 459         if (rc)
 460                 return rc;
 461
 462         if (num_online_cpus() == 1)
 463                 /* Just in case we booted with a single CPU. */
 464                 alternatives_enable_smp();
 465
 466         rc = xen_smp_intr_init(cpu);
 467         if (rc)
 468                 return rc;
 469
 470         rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
 471         BUG_ON(rc);
 472
 473         while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
 474                 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 475                 barrier();
 476         }
 477
 478         return 0;
 479 }
 480
 481 static void xen_smp_cpus_done(unsigned int max_cpus)
 482 {
 483 }
 484
 485 #ifdef CONFIG_HOTPLUG_CPU
 486 static int xen_cpu_disable(void)
 487 {
 488         unsigned int cpu = smp_processor_id();
 489         if (cpu == 0)
 490                 return -EBUSY;
 491
 492         cpu_disable_common();
 493
 494         load_cr3(swapper_pg_dir);
 495         return 0;
 496 }
 497
 498 static void xen_cpu_die(unsigned int cpu)
 499 {
 500         while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
 501                 current->state = TASK_UNINTERRUPTIBLE;
 502                 schedule_timeout(HZ/10);
 503         }
 504         xen_smp_intr_free(cpu);
 505         xen_uninit_lock_cpu(cpu);
 506         xen_teardown_timer(cpu);
 507 }
 508
 509 static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
 510 {
 511         play_dead_common();
 512         HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
 513         cpu_bringup();
 514         /*
 515          * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
 516          * clears certain data that the cpu_idle loop (which called us
 517          * and that we return from) expects. The only way to get that
 518          * data back is to call:
 519          */
 520         tick_nohz_idle_enter();
 521 }
 522
 523 #else /* !CONFIG_HOTPLUG_CPU */
 524 static int xen_cpu_disable(void)
 525 {
 526         return -ENOSYS;
 527 }
 528
 529 static void xen_cpu_die(unsigned int cpu)
 530 {
 531         BUG();
 532 }
 533
 534 static void xen_play_dead(void)
 535 {
 536         BUG();
 537 }
 538
 539 #endif
 540 static void stop_self(void *v)
 541 {
 542         int cpu = smp_processor_id();
 543
 544         /* make sure we're not pinning something down */
 545         load_cr3(swapper_pg_dir);
 546         /* should set up a minimal gdt */
 547
 548         set_cpu_online(cpu, false);
 549
 550         HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
 551         BUG();
 552 }
 553
 554 static void xen_stop_other_cpus(int wait)
 555 {
 556         smp_call_function(stop_self, NULL, wait);
 557 }
 558
 559 static void xen_smp_send_reschedule(int cpu)
 560 {
 561         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 562 }
 563
 564 static void __xen_send_IPI_mask(const struct cpumask *mask,
 565                               int vector)
 566 {
 567         unsigned cpu;
 568
 569         for_each_cpu_and(cpu, mask, cpu_online_mask)
 570                 xen_send_IPI_one(cpu, vector);
 571 }
 572
 573 static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 574 {
 575         int cpu;
 576
 577         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 578
 579         /* Make sure other vcpus get a chance to run if they need to. */
 580         for_each_cpu(cpu, mask) {
 581                 if (xen_vcpu_stolen(cpu)) {
 582                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 583                         break;
 584                 }
 585         }
 586 }
 587
 588 static void xen_smp_send_call_function_single_ipi(int cpu)
 589 {
 590         __xen_send_IPI_mask(cpumask_of(cpu),
 591                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 592 }
 593
 594 static inline int xen_map_vector(int vector)
 595 {
 596         int xen_vector;
 597
 598         switch (vector) {
 599         case RESCHEDULE_VECTOR:
 600                 xen_vector = XEN_RESCHEDULE_VECTOR;
 601                 break;
 602         case CALL_FUNCTION_VECTOR:
 603                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
 604                 break;
 605         case CALL_FUNCTION_SINGLE_VECTOR:
 606                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
 607                 break;
 608         case IRQ_WORK_VECTOR:
 609                 xen_vector = XEN_IRQ_WORK_VECTOR;
 610                 break;
 611 #ifdef CONFIG_X86_64
 612         case NMI_VECTOR:
 613         case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
 614                 xen_vector = XEN_NMI_VECTOR;
 615                 break;
 616 #endif
 617         default:
 618                 xen_vector = -1;
 619                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
 620                         vector);
 621         }
 622
 623         return xen_vector;
 624 }
 625
 626 void xen_send_IPI_mask(const struct cpumask *mask,
 627                               int vector)
 628 {
 629         int xen_vector = xen_map_vector(vector);
 630
 631         if (xen_vector >= 0)
 632                 __xen_send_IPI_mask(mask, xen_vector);
 633 }
 634
 635 void xen_send_IPI_all(int vector)
 636 {
 637         int xen_vector = xen_map_vector(vector);
 638
 639         if (xen_vector >= 0)
 640                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
 641 }
 642
 643 void xen_send_IPI_self(int vector)
 644 {
 645         int xen_vector = xen_map_vector(vector);
 646
 647         if (xen_vector >= 0)
 648                 xen_send_IPI_one(smp_processor_id(), xen_vector);
 649 }
 650
 651 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
 652                                 int vector)
 653 {
 654         unsigned cpu;
 655         unsigned int this_cpu = smp_processor_id();
 656         int xen_vector = xen_map_vector(vector);
 657
 658         if (!(num_online_cpus() > 1) || (xen_vector < 0))
 659                 return;
 660
 661         for_each_cpu_and(cpu, mask, cpu_online_mask) {
 662                 if (this_cpu == cpu)
 663                         continue;
 664
 665                 xen_send_IPI_one(cpu, xen_vector);
 666         }
 667 }
 668
 669 void xen_send_IPI_allbutself(int vector)
 670 {
 671         xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
 672 }
 673
 674 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 675 {
 676         irq_enter();
 677         generic_smp_call_function_interrupt();
 678         inc_irq_stat(irq_call_count);
 679         irq_exit();
 680
 681         return IRQ_HANDLED;
 682 }
 683
 684 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 685 {
 686         irq_enter();
 687         generic_smp_call_function_single_interrupt();
 688         inc_irq_stat(irq_call_count);
 689         irq_exit();
 690
 691         return IRQ_HANDLED;
 692 }
 693
 694 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 695 {
 696         irq_enter();
 697         irq_work_run();
 698         inc_irq_stat(apic_irq_work_irqs);
 699         irq_exit();
 700
 701         return IRQ_HANDLED;
 702 }
 703
 704 static const struct smp_ops xen_smp_ops __initconst = {
 705         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
 706         .smp_prepare_cpus = xen_smp_prepare_cpus,
 707         .smp_cpus_done = xen_smp_cpus_done,
 708
 709         .cpu_up = xen_cpu_up,
 710         .cpu_die = xen_cpu_die,
 711         .cpu_disable = xen_cpu_disable,
 712         .play_dead = xen_play_dead,
 713
 714         .stop_other_cpus = xen_stop_other_cpus,
 715         .smp_send_reschedule = xen_smp_send_reschedule,
 716
 717         .send_call_func_ipi = xen_smp_send_call_function_ipi,
 718         .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
 719 };
 720
 721 void __init xen_smp_init(void)
 722 {
 723         smp_ops = xen_smp_ops;
 724         xen_fill_possible_map();
 725 }
 726
 727 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
 728 {
 729         native_smp_prepare_cpus(max_cpus);
 730         WARN_ON(xen_smp_intr_init(0));
 731
 732         xen_init_lock_cpu(0);
 733 }
 734
 735 static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
 736 {
 737         int rc;
 738         /*
 739          * xen_smp_intr_init() needs to run before native_cpu_up()
 740          * so that IPI vectors are set up on the booting CPU before
 741          * it is marked online in native_cpu_up().
 742         */
 743         rc = xen_smp_intr_init(cpu);
 744         WARN_ON(rc);
 745         if (!rc)
 746                 rc =  native_cpu_up(cpu, tidle);
 747
 748         /*
 749          * We must initialize the slowpath CPU kicker _after_ the native
 750          * path has executed. If we initialized it before none of the
 751          * unlocker IPI kicks would reach the booting CPU as the booting
 752          * CPU had not set itself 'online' in cpu_online_mask. That mask
 753          * is checked when IPIs are sent (on HVM at least).
 754          */
 755         xen_init_lock_cpu(cpu);
 756         return rc;
 757 }
 758
 759 static void xen_hvm_cpu_die(unsigned int cpu)
 760 {
 761         xen_cpu_die(cpu);
 762         native_cpu_die(cpu);
 763 }
 764
 765 void __init xen_hvm_smp_init(void)
 766 {
 767         if (!xen_have_vector_callback)
 768                 return;
 769         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 770         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
 771         smp_ops.cpu_up = xen_hvm_cpu_up;
 772         smp_ops.cpu_die = xen_hvm_cpu_die;
 773         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 774         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 775         smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
 776 }