arch/x86/xen/smp_hvm.c

   1 #include <asm/smp.h>
   2
   3 #include <xen/events.h>
   4
   5 #include "xen-ops.h"
   6 #include "smp.h"
   7
   8
   9 static void __init xen_hvm_smp_prepare_boot_cpu(void)
  10 {
  11         BUG_ON(smp_processor_id() != 0);
  12         native_smp_prepare_boot_cpu();
  13
  14         /*
  15          * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
  16          * in xen_cpu_up_prepare_hvm().
  17          */
  18         xen_vcpu_setup(0);
  19
  20         /*
  21          * The alternative logic (which patches the unlock/lock) runs before
  22          * the smp bootup up code is activated. Hence we need to set this up
  23          * the core kernel is being patched. Otherwise we will have only
  24          * modules patched but not core code.
  25          */
  26         xen_init_spinlocks();
  27 }
  28
  29 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
  30 {
  31         int cpu;
  32
  33         native_smp_prepare_cpus(max_cpus);
  34         WARN_ON(xen_smp_intr_init(0));
  35
  36         xen_init_lock_cpu(0);
  37
  38         for_each_possible_cpu(cpu) {
  39                 if (cpu == 0)
  40                         continue;
  41
  42                 /* Set default vcpu_id to make sure that we don't use cpu-0's */
  43                 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
  44         }
  45 }
  46
  47 #ifdef CONFIG_HOTPLUG_CPU
  48 static void xen_hvm_cpu_die(unsigned int cpu)
  49 {
  50         if (common_cpu_die(cpu) == 0) {
  51                 xen_smp_intr_free(cpu);
  52                 xen_uninit_lock_cpu(cpu);
  53                 xen_teardown_timer(cpu);
  54         }
  55 }
  56 #else
  57 static void xen_hvm_cpu_die(unsigned int cpu)
  58 {
  59         BUG();
  60 }
  61 #endif
  62
  63 void __init xen_hvm_smp_init(void)
  64 {
  65         if (!xen_have_vector_callback)
  66                 return;
  67
  68         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
  69         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
  70         smp_ops.cpu_die = xen_hvm_cpu_die;
  71         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
  72         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
  73         smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
  74         smp_ops.smp_cpus_done = xen_smp_cpus_done;
  75 }