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          * The alternative logic (which patches the unlock/lock) runs before
  23          * the smp bootup up code is activated. Hence we need to set this up
  24          * the core kernel is being patched. Otherwise we will have only
  25          * modules patched but not core code.
  26          */
  27         xen_init_spinlocks();
  28 }
  29
  30 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
  31 {
  32         int cpu;
  33
  34         native_smp_prepare_cpus(max_cpus);
  35         WARN_ON(xen_smp_intr_init(0));
  36
  37         xen_init_lock_cpu(0);
  38
  39         for_each_possible_cpu(cpu) {
  40                 if (cpu == 0)
  41                         continue;
  42
  43                 /* Set default vcpu_id to make sure that we don't use cpu-0's */
  44                 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
  45         }
  46 }
  47
  48 #ifdef CONFIG_HOTPLUG_CPU
  49 static void xen_hvm_cpu_die(unsigned int cpu)
  50 {
  51         if (common_cpu_die(cpu) == 0) {
  52                 xen_smp_intr_free(cpu);
  53                 xen_uninit_lock_cpu(cpu);
  54                 xen_teardown_timer(cpu);
  55         }
  56 }
  57 #else
  58 static void xen_hvm_cpu_die(unsigned int cpu)
  59 {
  60         BUG();
  61 }
  62 #endif
  63
  64 void __init xen_hvm_smp_init(void)
  65 {
  66         if (!xen_have_vector_callback)
  67                 return;
  68
  69         smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
  70         smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
  71         smp_ops.cpu_die = xen_hvm_cpu_die;
  72         smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
  73         smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
  74         smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
  75         smp_ops.smp_cpus_done = xen_smp_cpus_done;
  76 }