linux_kernel/arch/x86/xen/smp_hvm.c

#include <asm/smp.h>

#include <xen/events.h>

#include "xen-ops.h"
#include "smp.h"


static void __init xen_hvm_smp_prepare_boot_cpu(void)
{
	BUG_ON(smp_processor_id() != 0);
	native_smp_prepare_boot_cpu();

	/*
	 * Setup vcpu_info for boot CPU.
	 */
	xen_vcpu_setup(0);

	/*
	 * The alternative logic (which patches the unlock/lock) runs before
	 * the smp bootup up code is activated. Hence we need to set this up
	 * the core kernel is being patched. Otherwise we will have only
	 * modules patched but not core code.
	 */
	xen_init_spinlocks();
}

static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
{
	native_smp_prepare_cpus(max_cpus);
	WARN_ON(xen_smp_intr_init(0));

	xen_init_lock_cpu(0);
}

#ifdef CONFIG_HOTPLUG_CPU
static void xen_hvm_cpu_die(unsigned int cpu)
{
	if (common_cpu_die(cpu) == 0) {
		xen_smp_intr_free(cpu);
		xen_uninit_lock_cpu(cpu);
		xen_teardown_timer(cpu);
	}
}
#else
static void xen_hvm_cpu_die(unsigned int cpu)
{
	BUG();
}
#endif

void __init xen_hvm_smp_init(void)
{
	if (!xen_have_vector_callback)
		return;

	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
	smp_ops.cpu_die = xen_hvm_cpu_die;
	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
	smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
}