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Commit 4d737042 authored by Boris Ostrovsky's avatar Boris Ostrovsky Committed by David Vrabel
Browse files

xen/x86: Convert to hotplug state machine 



Switch to new CPU hotplug infrastructure.

Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Suggested-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 8129554c

arch/x86/xen/enlighten.c

+65 −50
Original line number Diff line number Diff line
@@ -140,7 +140,9 @@ RESERVE_BRK(shared_info_page_brk, PAGE_SIZE); 
__read_mostly int xen_have_vector_callback;

EXPORT_SYMBOL_GPL(xen_have_vector_callback);



static struct notifier_block xen_cpu_notifier;

static int xen_cpu_up_prepare(unsigned int cpu);

static int xen_cpu_up_online(unsigned int cpu);

static int xen_cpu_dead(unsigned int cpu);



/*

 * Point at some empty memory to start with. We map the real shared_info
@@ -1541,6 +1543,24 @@ static void __init xen_dom0_set_legacy_features(void) 
	x86_platform.legacy.rtc = 1;

}



static int xen_cpuhp_setup(void)

{

	int rc;



	rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,

				       "XEN_HVM_GUEST_PREPARE",

				       xen_cpu_up_prepare, xen_cpu_dead);

	if (rc >= 0) {

		rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,

					       "XEN_HVM_GUEST_ONLINE",

					       xen_cpu_up_online, NULL);

		if (rc < 0)

			cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);

	}



	return rc >= 0 ? 0 : rc;

}



/* First C function to be called on Xen boot */

asmlinkage __visible void __init xen_start_kernel(void)

{
@@ -1629,7 +1649,7 @@ asmlinkage __visible void __init xen_start_kernel(void) 
	xen_initial_gdt = &per_cpu(gdt_page, 0);



	xen_smp_init();

	register_cpu_notifier(&xen_cpu_notifier);

	WARN_ON(xen_cpuhp_setup());



#ifdef CONFIG_ACPI_NUMA

	/*
@@ -1823,14 +1843,10 @@ static void __init init_hvm_pv_info(void) 
	xen_domain_type = XEN_HVM_DOMAIN;

}



static int xen_cpu_notify(struct notifier_block *self, unsigned long action,

			 void *hcpu)

static int xen_cpu_up_prepare(unsigned int cpu)

{

	int cpu = (long)hcpu;

	int rc;



	switch (action) {

	case CPU_UP_PREPARE:

	if (xen_hvm_domain()) {

		/*

		 * This can happen if CPU was offlined earlier and
@@ -1857,29 +1873,28 @@ static int xen_cpu_notify(struct notifier_block *self, unsigned long action, 
	if (rc) {

		WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",

		     cpu, rc);

			return NOTIFY_BAD;

		return rc;

	}

	return 0;

}



		break;

	case CPU_ONLINE:

		xen_init_lock_cpu(cpu);

		break;

	case CPU_UP_CANCELED:

static int xen_cpu_dead(unsigned int cpu)

{

	xen_smp_intr_free(cpu);



	if (xen_pv_domain() ||

	    (xen_have_vector_callback &&

	     xen_feature(XENFEAT_hvm_safe_pvclock)))

		xen_teardown_timer(cpu);

		break;

	default:

		break;

	}

	return NOTIFY_OK;



	return 0;

}



static struct notifier_block xen_cpu_notifier = {

	.notifier_call	= xen_cpu_notify,

};

static int xen_cpu_up_online(unsigned int cpu)

{

	xen_init_lock_cpu(cpu);

	return 0;

}



#ifdef CONFIG_KEXEC_CORE

static void xen_hvm_shutdown(void)
@@ -1910,7 +1925,7 @@ static void __init xen_hvm_guest_init(void) 
	if (xen_feature(XENFEAT_hvm_callback_vector))

		xen_have_vector_callback = 1;

	xen_hvm_smp_init();

	register_cpu_notifier(&xen_cpu_notifier);

	WARN_ON(xen_cpuhp_setup());

	xen_unplug_emulated_devices();

	x86_init.irqs.intr_init = xen_init_IRQ;

	xen_hvm_init_time_ops();

include/linux/cpuhotplug.h

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ enum cpuhp_state { 
	CPUHP_X2APIC_PREPARE,

	CPUHP_SMPCFD_PREPARE,

	CPUHP_RCUTREE_PREP,

	CPUHP_XEN_PREPARE,

	CPUHP_NOTIFY_PREPARE,

	CPUHP_TIMERS_DEAD,

	CPUHP_BRINGUP_CPU,