arch/x86/xen/smp_hvm.c

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