arch/x86/xen/smp_hvm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <asm/smp.h>
   3
   4 #include <xen/events.h>
   5
   6 #include "xen-ops.h"
   7 #include "smp.h"
   8
   9
  10 static void __init xen_hvm_smp_prepare_boot_cpu(void)
  11 {
  12         BUG_ON(smp_processor_id() != 0);
  13         native_smp_prepare_boot_cpu();
  14
  15         /*
  16          * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
  17          * in xen_cpu_up_prepare_hvm().
  18          */
  19         xen_vcpu_setup(0);
  20
  21         /*
  22          * Called again in case the kernel boots on vcpu >= MAX_VIRT_CPUS.
  23          * Refer to comments in xen_hvm_init_time_ops().
  24          */
  25         xen_hvm_init_time_ops();
  26
  27         /*
  28          * The alternative logic (which patches the unlock/lock) runs before
  29          * the smp bootup up code is activated. Hence we need to set this up
  30          * the core kernel is being patched. Otherwise we will have only
  31          * modules patched but not core code.
  32          */
  33         xen_init_spinlocks();
  34 }
  35
  36 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
  37 {
  38         int cpu;
  39
  40         native_smp_prepare_cpus(max_cpus);
  41         WARN_ON(xen_smp_intr_init(0));
  42
  43         xen_init_lock_cpu(0);
  44
  45         for_each_possible_cpu(cpu) {
  46                 if (cpu == 0)
  47                         continue;
  48
  49                 /* Set default vcpu_id to make sure that we don't use cpu-0's */
  50                 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
  51         }
  52 }
  53
  54 #ifdef CONFIG_HOTPLUG_CPU
  55 static void xen_hvm_cpu_die(unsigned int cpu)
  56 {
  57         if (common_cpu_die(cpu) == 0) {
  58                 xen_smp_intr_free(cpu);
  59                 xen_uninit_lock_cpu(cpu);
  60                 xen_teardown_timer(cpu);
  61         }
  62 }
  63 #else
  64 static void xen_hvm_cpu_die(unsigned int cpu)
  65 {
  66         BUG();
  67 }
  68 #endif
  69
  70 void __init xen_hvm_smp_init(void)
  71 {
  72         if (!xen_have_vector_callback)
  73                 return;
  74
  75         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
  76         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
  77         smp_ops.cpu_die = xen_hvm_cpu_die;
  78         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
  79         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
  80         smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
  81         smp_ops.smp_cpus_done = xen_smp_cpus_done;
  82 }