[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / xen / smp.c

/*
 * Xen SMP support
 *
 * This file implements the Xen versions of smp_ops.  SMP under Xen is
 * very straightforward.  Bringing a CPU up is simply a matter of
 * loading its initial context and setting it running.
 *
 * IPIs are handled through the Xen event mechanism.
 *
 * Because virtual CPUs can be scheduled onto any real CPU, there's no
 * useful topology information for the kernel to make use of.  As a
 * result, all CPUs are treated as if they're single-core and
 * single-threaded.
 */
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/irq_work.h>
#include <linux/tick.h>

#include <asm/paravirt.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cpu.h>

#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>

#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>

#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>

#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "mmu.h"

cpumask_var_t xen_cpu_initialized_map;

static DEFINE_PER_CPU(int, xen_resched_irq);
static DEFINE_PER_CPU(int, xen_callfunc_irq);
static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
static DEFINE_PER_CPU(int, xen_irq_work);
static DEFINE_PER_CPU(int, xen_debug_irq) = -1;

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);

/*
 * Reschedule call back.
 */
static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
{
	inc_irq_stat(irq_resched_count);
	scheduler_ipi();

	return IRQ_HANDLED;
}

static void __cpuinit cpu_bringup(void)
{
	int cpu;

	cpu_init();
	touch_softlockup_watchdog();
	preempt_disable();

	xen_enable_sysenter();
	xen_enable_syscall();

	cpu = smp_processor_id();
	smp_store_cpu_info(cpu);
	cpu_data(cpu).x86_max_cores = 1;
	set_cpu_sibling_map(cpu);

	xen_setup_cpu_clockevents();

	notify_cpu_starting(cpu);

	set_cpu_online(cpu, true);

	this_cpu_write(cpu_state, CPU_ONLINE);

	wmb();

	/* We can take interrupts now: we're officially "up". */
	local_irq_enable();

	wmb();			/* make sure everything is out */
}

static void __cpuinit cpu_bringup_and_idle(void)
{
	cpu_bringup();
	cpu_startup_entry(CPUHP_ONLINE);
}

static int xen_smp_intr_init(unsigned int cpu)
{
	int rc;
	const char *resched_name, *callfunc_name, *debug_name;

	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
				    cpu,
				    xen_reschedule_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    resched_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_resched_irq, cpu) = rc;

	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
				    cpu,
				    xen_call_function_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfunc_irq, cpu) = rc;

	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
				     IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
				     debug_name, NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_debug_irq, cpu) = rc;

	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
				    cpu,
				    xen_call_function_single_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfuncsingle_irq, cpu) = rc;

	/*
	 * The IRQ worker on PVHVM goes through the native path and uses the
	 * IPI mechanism.
	 */
	if (xen_hvm_domain())
		return 0;

	callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
				    cpu,
				    xen_irq_work_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_irq_work, cpu) = rc;

	return 0;

 fail:
	if (per_cpu(xen_resched_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	if (per_cpu(xen_callfunc_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	if (per_cpu(xen_debug_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
				       NULL);
	if (xen_hvm_domain())
		return rc;

	if (per_cpu(xen_irq_work, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);

	return rc;
}

static void __init xen_fill_possible_map(void)
{
	int i, rc;

	if (xen_initial_domain())
		return;

	for (i = 0; i < nr_cpu_ids; i++) {
		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
		if (rc >= 0) {
			num_processors++;
			set_cpu_possible(i, true);
		}
	}
}

static void __init xen_filter_cpu_maps(void)
{
	int i, rc;
	unsigned int subtract = 0;

	if (!xen_initial_domain())
		return;

	num_processors = 0;
	disabled_cpus = 0;
	for (i = 0; i < nr_cpu_ids; i++) {
		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
		if (rc >= 0) {
			num_processors++;
			set_cpu_possible(i, true);
		} else {
			set_cpu_possible(i, false);
			set_cpu_present(i, false);
			subtract++;
		}
	}
#ifdef CONFIG_HOTPLUG_CPU
	/* This is akin to using 'nr_cpus' on the Linux command line.
	 * Which is OK as when we use 'dom0_max_vcpus=X' we can only
	 * have up to X, while nr_cpu_ids is greater than X. This
	 * normally is not a problem, except when CPU hotplugging
	 * is involved and then there might be more than X CPUs
	 * in the guest - which will not work as there is no
	 * hypercall to expand the max number of VCPUs an already
	 * running guest has. So cap it up to X. */
	if (subtract)
		nr_cpu_ids = nr_cpu_ids - subtract;
#endif

}

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

	/* We've switched to the "real" per-cpu gdt, so make sure the
	   old memory can be recycled */
	make_lowmem_page_readwrite(xen_initial_gdt);

	xen_filter_cpu_maps();
	xen_setup_vcpu_info_placement();
}

static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
{
	unsigned cpu;
	unsigned int i;

	if (skip_ioapic_setup) {
		char *m = (max_cpus == 0) ?
			"The nosmp parameter is incompatible with Xen; " \
			"use Xen dom0_max_vcpus=1 parameter" :
			"The noapic parameter is incompatible with Xen";

		xen_raw_printk(m);
		panic(m);
	}
	xen_init_lock_cpu(0);

	smp_store_boot_cpu_info();
	cpu_data(0).x86_max_cores = 1;

	for_each_possible_cpu(i) {
		zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
		zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
		zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
	}
	set_cpu_sibling_map(0);

	if (xen_smp_intr_init(0))
		BUG();

	if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
		panic("could not allocate xen_cpu_initialized_map\n");

	cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));

	/* Restrict the possible_map according to max_cpus. */
	while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
		for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
			continue;
		set_cpu_possible(cpu, false);
	}

	for_each_possible_cpu(cpu)
		set_cpu_present(cpu, true);
}

static int __cpuinit
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
{
	struct vcpu_guest_context *ctxt;
	struct desc_struct *gdt;
	unsigned long gdt_mfn;

	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
		return 0;

	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
	if (ctxt == NULL)
		return -ENOMEM;

	gdt = get_cpu_gdt_table(cpu);

	ctxt->flags = VGCF_IN_KERNEL;
	ctxt->user_regs.ss = __KERNEL_DS;
#ifdef CONFIG_X86_32
	ctxt->user_regs.fs = __KERNEL_PERCPU;
	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#else
	ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
	ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;

	memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));

	{
		ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
		ctxt->user_regs.ds = __USER_DS;
		ctxt->user_regs.es = __USER_DS;

		xen_copy_trap_info(ctxt->trap_ctxt);

		ctxt->ldt_ents = 0;

		BUG_ON((unsigned long)gdt & ~PAGE_MASK);

		gdt_mfn = arbitrary_virt_to_mfn(gdt);
		make_lowmem_page_readonly(gdt);
		make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));

		ctxt->gdt_frames[0] = gdt_mfn;
		ctxt->gdt_ents      = GDT_ENTRIES;

		ctxt->kernel_ss = __KERNEL_DS;
		ctxt->kernel_sp = idle->thread.sp0;

#ifdef CONFIG_X86_32
		ctxt->event_callback_cs     = __KERNEL_CS;
		ctxt->failsafe_callback_cs  = __KERNEL_CS;
#endif
		ctxt->event_callback_eip    =
					(unsigned long)xen_hypervisor_callback;
		ctxt->failsafe_callback_eip =
					(unsigned long)xen_failsafe_callback;
	}
	ctxt->user_regs.cs = __KERNEL_CS;
	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);

	per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));

	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
		BUG();

	kfree(ctxt);
	return 0;
}

static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
{
	int rc;

	per_cpu(current_task, cpu) = idle;
#ifdef CONFIG_X86_32
	irq_ctx_init(cpu);
#else
	clear_tsk_thread_flag(idle, TIF_FORK);
	per_cpu(kernel_stack, cpu) =
		(unsigned long)task_stack_page(idle) -
		KERNEL_STACK_OFFSET + THREAD_SIZE;
#endif
	xen_setup_runstate_info(cpu);
	xen_setup_timer(cpu);
	xen_init_lock_cpu(cpu);

	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;

	/* make sure interrupts start blocked */
	per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;

	rc = cpu_initialize_context(cpu, idle);
	if (rc)
		return rc;

	if (num_online_cpus() == 1)
		/* Just in case we booted with a single CPU. */
		alternatives_enable_smp();

	rc = xen_smp_intr_init(cpu);
	if (rc)
		return rc;

	rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
	BUG_ON(rc);

	while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
		HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
		barrier();
	}

	return 0;
}

static void xen_smp_cpus_done(unsigned int max_cpus)
{
}

#ifdef CONFIG_HOTPLUG_CPU
static int xen_cpu_disable(void)
{
	unsigned int cpu = smp_processor_id();
	if (cpu == 0)
		return -EBUSY;

	cpu_disable_common();

	load_cr3(swapper_pg_dir);
	return 0;
}

static void xen_cpu_die(unsigned int cpu)
{
	while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
		current->state = TASK_UNINTERRUPTIBLE;
		schedule_timeout(HZ/10);
	}
	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
	if (!xen_hvm_domain())
		unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
	xen_uninit_lock_cpu(cpu);
	xen_teardown_timer(cpu);
}

static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
{
	play_dead_common();
	HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
	cpu_bringup();
	/*
	 * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
	 * clears certain data that the cpu_idle loop (which called us
	 * and that we return from) expects. The only way to get that
	 * data back is to call:
	 */
	tick_nohz_idle_enter();
}

#else /* !CONFIG_HOTPLUG_CPU */
static int xen_cpu_disable(void)
{
	return -ENOSYS;
}

static void xen_cpu_die(unsigned int cpu)
{
	BUG();
}

static void xen_play_dead(void)
{
	BUG();
}

#endif
static void stop_self(void *v)
{
	int cpu = smp_processor_id();

	/* make sure we're not pinning something down */
	load_cr3(swapper_pg_dir);
	/* should set up a minimal gdt */

	set_cpu_online(cpu, false);

	HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
	BUG();
}

static void xen_stop_other_cpus(int wait)
{
	smp_call_function(stop_self, NULL, wait);
}

static void xen_smp_send_reschedule(int cpu)
{
	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}

static void __xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	unsigned cpu;

	for_each_cpu_and(cpu, mask, cpu_online_mask)
		xen_send_IPI_one(cpu, vector);
}

static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
{
	int cpu;

	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);

	/* Make sure other vcpus get a chance to run if they need to. */
	for_each_cpu(cpu, mask) {
		if (xen_vcpu_stolen(cpu)) {
			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
			break;
		}
	}
}

static void xen_smp_send_call_function_single_ipi(int cpu)
{
	__xen_send_IPI_mask(cpumask_of(cpu),
			  XEN_CALL_FUNCTION_SINGLE_VECTOR);
}

static inline int xen_map_vector(int vector)
{
	int xen_vector;

	switch (vector) {
	case RESCHEDULE_VECTOR:
		xen_vector = XEN_RESCHEDULE_VECTOR;
		break;
	case CALL_FUNCTION_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_VECTOR;
		break;
	case CALL_FUNCTION_SINGLE_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
		break;
	case IRQ_WORK_VECTOR:
		xen_vector = XEN_IRQ_WORK_VECTOR;
		break;
	default:
		xen_vector = -1;
		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
			vector);
	}

	return xen_vector;
}

void xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(mask, xen_vector);
}

void xen_send_IPI_all(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(cpu_online_mask, xen_vector);
}

void xen_send_IPI_self(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		xen_send_IPI_one(smp_processor_id(), xen_vector);
}

void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
				int vector)
{
	unsigned cpu;
	unsigned int this_cpu = smp_processor_id();
	int xen_vector = xen_map_vector(vector);

	if (!(num_online_cpus() > 1) || (xen_vector < 0))
		return;

	for_each_cpu_and(cpu, mask, cpu_online_mask) {
		if (this_cpu == cpu)
			continue;

		xen_send_IPI_one(cpu, xen_vector);
	}
}

void xen_send_IPI_allbutself(int vector)
{
	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
}

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}

static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_single_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}

static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
{
	irq_enter();
	irq_work_run();
	inc_irq_stat(apic_irq_work_irqs);
	irq_exit();

	return IRQ_HANDLED;
}

static const struct smp_ops xen_smp_ops __initconst = {
	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
	.smp_prepare_cpus = xen_smp_prepare_cpus,
	.smp_cpus_done = xen_smp_cpus_done,

	.cpu_up = xen_cpu_up,
	.cpu_die = xen_cpu_die,
	.cpu_disable = xen_cpu_disable,
	.play_dead = xen_play_dead,

	.stop_other_cpus = xen_stop_other_cpus,
	.smp_send_reschedule = xen_smp_send_reschedule,

	.send_call_func_ipi = xen_smp_send_call_function_ipi,
	.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
};

void __init xen_smp_init(void)
{
	smp_ops = xen_smp_ops;
	xen_fill_possible_map();
	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);
}

static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
{
	int rc;
	rc = native_cpu_up(cpu, tidle);
	WARN_ON (xen_smp_intr_init(cpu));
	return rc;
}

static void xen_hvm_cpu_die(unsigned int cpu)
{
	xen_cpu_die(cpu);
	native_cpu_die(cpu);
}

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_up = xen_hvm_cpu_up;
	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;
}
Commit	Line	Data
f87e4cac JF	1	/*
	2	* Xen SMP support
	3	*
	4	* This file implements the Xen versions of smp_ops. SMP under Xen is
	5	* very straightforward. Bringing a CPU up is simply a matter of
	6	* loading its initial context and setting it running.
	7	*
	8	* IPIs are handled through the Xen event mechanism.
	9	*
	10	* Because virtual CPUs can be scheduled onto any real CPU, there's no
	11	* useful topology information for the kernel to make use of. As a
	12	* result, all CPUs are treated as if they're single-core and
	13	* single-threaded.
f87e4cac JF	14	*/
	15	#include <linux/sched.h>
	16	#include <linux/err.h>
5a0e3ad6	17	#include <linux/slab.h>
f87e4cac	18	#include <linux/smp.h>
1ff2b0c3	19	#include <linux/irq_work.h>
466318a8	20	#include <linux/tick.h>
f87e4cac JF	21
	22	#include <asm/paravirt.h>
	23	#include <asm/desc.h>
	24	#include <asm/pgtable.h>
	25	#include <asm/cpu.h>
	26
	27	#include <xen/interface/xen.h>
	28	#include <xen/interface/vcpu.h>
	29
	30	#include <asm/xen/interface.h>
	31	#include <asm/xen/hypercall.h>
	32
ea5b8f73	33	#include <xen/xen.h>
f87e4cac JF	34	#include <xen/page.h>
	35	#include <xen/events.h>
	36
ed467e69	37	#include <xen/hvc-console.h>
f87e4cac JF	38	#include "xen-ops.h"
	39	#include "mmu.h"
	40
b78936e1	41	cpumask_var_t xen_cpu_initialized_map;
f87e4cac	42
c6e22f9e TH	43	static DEFINE_PER_CPU(int, xen_resched_irq);
	44	static DEFINE_PER_CPU(int, xen_callfunc_irq);
	45	static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
1ff2b0c3	46	static DEFINE_PER_CPU(int, xen_irq_work);
c6e22f9e	47	static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
f87e4cac JF	48
f87e4cac JF	49	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
3b16cf87	50	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
1ff2b0c3	51	static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
f87e4cac JF	52
f87e4cac JF	53	/*
184748cc	54	* Reschedule call back.
f87e4cac JF	55	*/
	56	static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
	57	{
1b437c8c	58	inc_irq_stat(irq_resched_count);
184748cc	59	scheduler_ipi();
38bb5ab4	60
f87e4cac JF	61	return IRQ_HANDLED;
	62	}
	63
b53cedeb	64	static void __cpuinit cpu_bringup(void)
f87e4cac	65	{
e8c9e788	66	int cpu;
f87e4cac JF	67
f87e4cac JF	68	cpu_init();
d68d82af	69	touch_softlockup_watchdog();
c7b75947 JF	70	preempt_disable();
c7b75947 JF	71
e2a81baf	72	xen_enable_sysenter();
6fcac6d3	73	xen_enable_syscall();
f87e4cac	74
c7b75947 JF	75	cpu = smp_processor_id();
	76	smp_store_cpu_info(cpu);
	77	cpu_data(cpu).x86_max_cores = 1;
	78	set_cpu_sibling_map(cpu);
f87e4cac JF	79
	80	xen_setup_cpu_clockevents();
	81
106b4438 KRW	82	notify_cpu_starting(cpu);
106b4438 KRW	83
d7d3756c	84	set_cpu_online(cpu, true);
106b4438	85
2113f469	86	this_cpu_write(cpu_state, CPU_ONLINE);
106b4438	87
c7b75947 JF	88	wmb();
c7b75947 JF	89
f87e4cac JF	90	/* We can take interrupts now: we're officially "up". */
	91	local_irq_enable();
	92
	93	wmb(); /* make sure everything is out */
d68d82af AN	94	}
d68d82af AN	95
b53cedeb	96	static void __cpuinit cpu_bringup_and_idle(void)
d68d82af AN	97	{
d68d82af AN	98	cpu_bringup();
7d1a9417	99	cpu_startup_entry(CPUHP_ONLINE);
f87e4cac JF	100	}
	101
	102	static int xen_smp_intr_init(unsigned int cpu)
	103	{
	104	int rc;
ee523ca1	105	const char resched_name, callfunc_name, *debug_name;
f87e4cac JF	106
	107	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	108	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
	109	cpu,
	110	xen_reschedule_interrupt,
	111	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	112	resched_name,
	113	NULL);
	114	if (rc < 0)
	115	goto fail;
c6e22f9e	116	per_cpu(xen_resched_irq, cpu) = rc;
f87e4cac JF	117
	118	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	119	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
	120	cpu,
	121	xen_call_function_interrupt,
	122	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	123	callfunc_name,
	124	NULL);
	125	if (rc < 0)
	126	goto fail;
c6e22f9e	127	per_cpu(xen_callfunc_irq, cpu) = rc;
f87e4cac	128
ee523ca1 JF	129	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
	130	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
	131	IRQF_DISABLED \| IRQF_PERCPU \| IRQF_NOBALANCING,
	132	debug_name, NULL);
	133	if (rc < 0)
	134	goto fail;
c6e22f9e	135	per_cpu(xen_debug_irq, cpu) = rc;
ee523ca1	136
3b16cf87 JA	137	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	138	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
	139	cpu,
	140	xen_call_function_single_interrupt,
	141	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	142	callfunc_name,
	143	NULL);
	144	if (rc < 0)
	145	goto fail;
c6e22f9e	146	per_cpu(xen_callfuncsingle_irq, cpu) = rc;
3b16cf87	147
27d8b207 KRW	148	/*
	149	* The IRQ worker on PVHVM goes through the native path and uses the
	150	* IPI mechanism.
	151	*/
	152	if (xen_hvm_domain())
	153	return 0;
	154
1ff2b0c3 LM	155	callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
	156	rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
	157	cpu,
	158	xen_irq_work_interrupt,
	159	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	160	callfunc_name,
	161	NULL);
	162	if (rc < 0)
	163	goto fail;
	164	per_cpu(xen_irq_work, cpu) = rc;
	165
f87e4cac JF	166	return 0;
	167
	168	fail:
c6e22f9e TH	169	if (per_cpu(xen_resched_irq, cpu) >= 0)
	170	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	171	if (per_cpu(xen_callfunc_irq, cpu) >= 0)
	172	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	173	if (per_cpu(xen_debug_irq, cpu) >= 0)
	174	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	175	if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
	176	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
	177	NULL);
27d8b207 KRW	178	if (xen_hvm_domain())
	179	return rc;
	180
1ff2b0c3 LM	181	if (per_cpu(xen_irq_work, cpu) >= 0)
1ff2b0c3 LM	182	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
3b16cf87	183
f87e4cac JF	184	return rc;
	185	}
	186
c7b75947	187	static void __init xen_fill_possible_map(void)
f87e4cac JF	188	{
	189	int i, rc;
	190
ea5b8f73 SS	191	if (xen_initial_domain())
	192	return;
	193
	194	for (i = 0; i < nr_cpu_ids; i++) {
	195	rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
	196	if (rc >= 0) {
	197	num_processors++;
	198	set_cpu_possible(i, true);
	199	}
	200	}
	201	}
	202
	203	static void __init xen_filter_cpu_maps(void)
	204	{
	205	int i, rc;
cf405ae6	206	unsigned int subtract = 0;
ea5b8f73 SS	207
	208	if (!xen_initial_domain())
	209	return;
	210
801fd14a SS	211	num_processors = 0;
801fd14a SS	212	disabled_cpus = 0;
e7986739	213	for (i = 0; i < nr_cpu_ids; i++) {
f87e4cac	214	rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
4560a294 JF	215	if (rc >= 0) {
4560a294 JF	216	num_processors++;
4f062896	217	set_cpu_possible(i, true);
801fd14a SS	218	} else {
	219	set_cpu_possible(i, false);
	220	set_cpu_present(i, false);
cf405ae6	221	subtract++;
4560a294	222	}
f87e4cac	223	}
cf405ae6 KRW	224	#ifdef CONFIG_HOTPLUG_CPU
	225	/* This is akin to using 'nr_cpus' on the Linux command line.
	226	* Which is OK as when we use 'dom0_max_vcpus=X' we can only
	227	* have up to X, while nr_cpu_ids is greater than X. This
	228	* normally is not a problem, except when CPU hotplugging
	229	* is involved and then there might be more than X CPUs
	230	* in the guest - which will not work as there is no
	231	* hypercall to expand the max number of VCPUs an already
	232	* running guest has. So cap it up to X. */
	233	if (subtract)
	234	nr_cpu_ids = nr_cpu_ids - subtract;
	235	#endif
	236
f87e4cac JF	237	}
f87e4cac JF	238
a9e7062d	239	static void __init xen_smp_prepare_boot_cpu(void)
f87e4cac	240	{
f87e4cac JF	241	BUG_ON(smp_processor_id() != 0);
	242	native_smp_prepare_boot_cpu();
	243
f87e4cac JF	244	/* We've switched to the "real" per-cpu gdt, so make sure the
f87e4cac JF	245	old memory can be recycled */
38341432	246	make_lowmem_page_readwrite(xen_initial_gdt);
60223a32	247
ea5b8f73	248	xen_filter_cpu_maps();
60223a32	249	xen_setup_vcpu_info_placement();
f87e4cac JF	250	}
f87e4cac JF	251
a9e7062d	252	static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
f87e4cac JF	253	{
f87e4cac JF	254	unsigned cpu;
900cba88	255	unsigned int i;
f87e4cac	256
ed467e69 KRW	257	if (skip_ioapic_setup) {
	258	char *m = (max_cpus == 0) ?
	259	"The nosmp parameter is incompatible with Xen; " \
	260	"use Xen dom0_max_vcpus=1 parameter" :
	261	"The noapic parameter is incompatible with Xen";
	262
	263	xen_raw_printk(m);
	264	panic(m);
	265	}
2d9e1e2f JF	266	xen_init_lock_cpu(0);
2d9e1e2f JF	267
06d0b5d9	268	smp_store_boot_cpu_info();
c7b75947	269	cpu_data(0).x86_max_cores = 1;
900cba88 AJ	270
	271	for_each_possible_cpu(i) {
	272	zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
	273	zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
	274	zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
	275	}
f87e4cac JF	276	set_cpu_sibling_map(0);
	277
	278	if (xen_smp_intr_init(0))
	279	BUG();
	280
b78936e1 MT	281	if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
	282	panic("could not allocate xen_cpu_initialized_map\n");
	283
	284	cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
f87e4cac JF	285
	286	/* Restrict the possible_map according to max_cpus. */
	287	while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
e7986739	288	for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
f87e4cac	289	continue;
4f062896	290	set_cpu_possible(cpu, false);
f87e4cac JF	291	}
f87e4cac JF	292
7eb43a6d	293	for_each_possible_cpu(cpu)
4f062896	294	set_cpu_present(cpu, true);
f87e4cac JF	295	}
f87e4cac JF	296
b53cedeb	297	static int __cpuinit
f87e4cac JF	298	cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
	299	{
	300	struct vcpu_guest_context *ctxt;
c7b75947	301	struct desc_struct *gdt;
9976b39b	302	unsigned long gdt_mfn;
f87e4cac	303
b78936e1	304	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
f87e4cac JF	305	return 0;
	306
	307	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
	308	if (ctxt == NULL)
	309	return -ENOMEM;
	310
c7b75947 JF	311	gdt = get_cpu_gdt_table(cpu);
c7b75947 JF	312
f87e4cac	313	ctxt->flags = VGCF_IN_KERNEL;
f87e4cac	314	ctxt->user_regs.ss = __KERNEL_DS;
c7b75947 JF	315	#ifdef CONFIG_X86_32
c7b75947 JF	316	ctxt->user_regs.fs = __KERNEL_PERCPU;
577eebea	317	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
795f99b6 JF	318	#else
795f99b6 JF	319	ctxt->gs_base_kernel = per_cpu_offset(cpu);
c7b75947	320	#endif
f87e4cac	321	ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
f87e4cac JF	322
	323	memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
	324
dacd45f4 KRW	325	{
	326	ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
	327	ctxt->user_regs.ds = __USER_DS;
	328	ctxt->user_regs.es = __USER_DS;
f87e4cac	329
dacd45f4	330	xen_copy_trap_info(ctxt->trap_ctxt);
f87e4cac	331
dacd45f4	332	ctxt->ldt_ents = 0;
9976b39b	333
dacd45f4	334	BUG_ON((unsigned long)gdt & ~PAGE_MASK);
f87e4cac	335
dacd45f4 KRW	336	gdt_mfn = arbitrary_virt_to_mfn(gdt);
	337	make_lowmem_page_readonly(gdt);
	338	make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
f87e4cac	339
dacd45f4 KRW	340	ctxt->gdt_frames[0] = gdt_mfn;
dacd45f4 KRW	341	ctxt->gdt_ents = GDT_ENTRIES;
f87e4cac	342
dacd45f4 KRW	343	ctxt->kernel_ss = __KERNEL_DS;
dacd45f4 KRW	344	ctxt->kernel_sp = idle->thread.sp0;
f87e4cac	345
c7b75947	346	#ifdef CONFIG_X86_32
dacd45f4 KRW	347	ctxt->event_callback_cs = __KERNEL_CS;
dacd45f4 KRW	348	ctxt->failsafe_callback_cs = __KERNEL_CS;
c7b75947	349	#endif
dacd45f4 KRW	350	ctxt->event_callback_eip =
	351	(unsigned long)xen_hypervisor_callback;
	352	ctxt->failsafe_callback_eip =
	353	(unsigned long)xen_failsafe_callback;
	354	}
	355	ctxt->user_regs.cs = __KERNEL_CS;
	356	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
f87e4cac JF	357
	358	per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
	359	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
	360
	361	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
	362	BUG();
	363
	364	kfree(ctxt);
	365	return 0;
	366	}
	367
7eb43a6d	368	static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
f87e4cac	369	{
f87e4cac JF	370	int rc;
f87e4cac JF	371
c6f5e0ac	372	per_cpu(current_task, cpu) = idle;
c7b75947	373	#ifdef CONFIG_X86_32
f87e4cac	374	irq_ctx_init(cpu);
c7b75947	375	#else
c7b75947	376	clear_tsk_thread_flag(idle, TIF_FORK);
38341432 JF	377	per_cpu(kernel_stack, cpu) =
	378	(unsigned long)task_stack_page(idle) -
	379	KERNEL_STACK_OFFSET + THREAD_SIZE;
c7b75947	380	#endif
02889672	381	xen_setup_runstate_info(cpu);
f87e4cac	382	xen_setup_timer(cpu);
2d9e1e2f	383	xen_init_lock_cpu(cpu);
f87e4cac	384
c7b75947 JF	385	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
c7b75947 JF	386
f87e4cac JF	387	/* make sure interrupts start blocked */
	388	per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
	389
	390	rc = cpu_initialize_context(cpu, idle);
	391	if (rc)
	392	return rc;
	393
	394	if (num_online_cpus() == 1)
816afe4f RR	395	/* Just in case we booted with a single CPU. */
816afe4f RR	396	alternatives_enable_smp();
f87e4cac JF	397
	398	rc = xen_smp_intr_init(cpu);
	399	if (rc)
	400	return rc;
	401
f87e4cac JF	402	rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
	403	BUG_ON(rc);
	404
c7b75947	405	while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
1207cf8e	406	HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
c7b75947 JF	407	barrier();
	408	}
	409
f87e4cac JF	410	return 0;
	411	}
	412
a9e7062d	413	static void xen_smp_cpus_done(unsigned int max_cpus)
f87e4cac JF	414	{
	415	}
	416
2737146b	417	#ifdef CONFIG_HOTPLUG_CPU
26fd1051	418	static int xen_cpu_disable(void)
d68d82af AN	419	{
	420	unsigned int cpu = smp_processor_id();
	421	if (cpu == 0)
	422	return -EBUSY;
	423
	424	cpu_disable_common();
	425
	426	load_cr3(swapper_pg_dir);
	427	return 0;
	428	}
	429
26fd1051	430	static void xen_cpu_die(unsigned int cpu)
d68d82af	431	{
b12abaa1	432	while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
d68d82af AN	433	current->state = TASK_UNINTERRUPTIBLE;
	434	schedule_timeout(HZ/10);
	435	}
c6e22f9e TH	436	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	437	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	438	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	439	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
b12abaa1 KRW	440	if (!xen_hvm_domain())
b12abaa1 KRW	441	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
d68d82af AN	442	xen_uninit_lock_cpu(cpu);
d68d82af AN	443	xen_teardown_timer(cpu);
d68d82af AN	444	}
d68d82af AN	445
71709247	446	static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
d68d82af AN	447	{
	448	play_dead_common();
	449	HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
	450	cpu_bringup();
466318a8 KRW	451	/*
	452	* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
	453	* clears certain data that the cpu_idle loop (which called us
	454	* and that we return from) expects. The only way to get that
	455	* data back is to call:
	456	*/
	457	tick_nohz_idle_enter();
d68d82af AN	458	}
d68d82af AN	459
2737146b	460	#else /* !CONFIG_HOTPLUG_CPU */
26fd1051	461	static int xen_cpu_disable(void)
2737146b AN	462	{
	463	return -ENOSYS;
	464	}
	465
26fd1051	466	static void xen_cpu_die(unsigned int cpu)
2737146b AN	467	{
	468	BUG();
	469	}
	470
26fd1051	471	static void xen_play_dead(void)
2737146b AN	472	{
	473	BUG();
	474	}
	475
	476	#endif
f87e4cac JF	477	static void stop_self(void *v)
	478	{
	479	int cpu = smp_processor_id();
	480
	481	/* make sure we're not pinning something down */
	482	load_cr3(swapper_pg_dir);
	483	/* should set up a minimal gdt */
	484
086748e5 IC	485	set_cpu_online(cpu, false);
086748e5 IC	486
f87e4cac JF	487	HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
	488	BUG();
	489	}
	490
76fac077	491	static void xen_stop_other_cpus(int wait)
f87e4cac	492	{
76fac077	493	smp_call_function(stop_self, NULL, wait);
f87e4cac JF	494	}
f87e4cac JF	495
a9e7062d	496	static void xen_smp_send_reschedule(int cpu)
f87e4cac JF	497	{
	498	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
	499	}
	500
f447d56d BG	501	static void __xen_send_IPI_mask(const struct cpumask *mask,
f447d56d BG	502	int vector)
f87e4cac JF	503	{
	504	unsigned cpu;
	505
bcda016e	506	for_each_cpu_and(cpu, mask, cpu_online_mask)
f87e4cac JF	507	xen_send_IPI_one(cpu, vector);
	508	}
	509
bcda016e	510	static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
3b16cf87 JA	511	{
	512	int cpu;
	513
f447d56d	514	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
3b16cf87 JA	515
3b16cf87 JA	516	/* Make sure other vcpus get a chance to run if they need to. */
bcda016e	517	for_each_cpu(cpu, mask) {
3b16cf87	518	if (xen_vcpu_stolen(cpu)) {
1207cf8e	519	HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
3b16cf87 JA	520	break;
	521	}
	522	}
	523	}
	524
a9e7062d	525	static void xen_smp_send_call_function_single_ipi(int cpu)
3b16cf87	526	{
f447d56d	527	__xen_send_IPI_mask(cpumask_of(cpu),
e7986739	528	XEN_CALL_FUNCTION_SINGLE_VECTOR);
3b16cf87 JA	529	}
3b16cf87 JA	530
f447d56d BG	531	static inline int xen_map_vector(int vector)
	532	{
	533	int xen_vector;
	534
	535	switch (vector) {
	536	case RESCHEDULE_VECTOR:
	537	xen_vector = XEN_RESCHEDULE_VECTOR;
	538	break;
	539	case CALL_FUNCTION_VECTOR:
	540	xen_vector = XEN_CALL_FUNCTION_VECTOR;
	541	break;
	542	case CALL_FUNCTION_SINGLE_VECTOR:
	543	xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
	544	break;
1ff2b0c3 LM	545	case IRQ_WORK_VECTOR:
	546	xen_vector = XEN_IRQ_WORK_VECTOR;
	547	break;
f447d56d BG	548	default:
	549	xen_vector = -1;
	550	printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
	551	vector);
	552	}
	553
	554	return xen_vector;
	555	}
	556
	557	void xen_send_IPI_mask(const struct cpumask *mask,
	558	int vector)
	559	{
	560	int xen_vector = xen_map_vector(vector);
	561
	562	if (xen_vector >= 0)
	563	__xen_send_IPI_mask(mask, xen_vector);
	564	}
	565
	566	void xen_send_IPI_all(int vector)
	567	{
	568	int xen_vector = xen_map_vector(vector);
	569
	570	if (xen_vector >= 0)
	571	__xen_send_IPI_mask(cpu_online_mask, xen_vector);
	572	}
	573
	574	void xen_send_IPI_self(int vector)
	575	{
	576	int xen_vector = xen_map_vector(vector);
	577
	578	if (xen_vector >= 0)
	579	xen_send_IPI_one(smp_processor_id(), xen_vector);
	580	}
	581
	582	void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
	583	int vector)
	584	{
	585	unsigned cpu;
	586	unsigned int this_cpu = smp_processor_id();
1db01b49	587	int xen_vector = xen_map_vector(vector);
f447d56d	588
1db01b49	589	if (!(num_online_cpus() > 1) \|\| (xen_vector < 0))
f447d56d BG	590	return;
	591
	592	for_each_cpu_and(cpu, mask, cpu_online_mask) {
	593	if (this_cpu == cpu)
	594	continue;
	595
1db01b49	596	xen_send_IPI_one(cpu, xen_vector);
f447d56d BG	597	}
	598	}
	599
	600	void xen_send_IPI_allbutself(int vector)
	601	{
1db01b49	602	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
f447d56d BG	603	}
f447d56d BG	604
f87e4cac JF	605	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
f87e4cac JF	606	{
f87e4cac	607	irq_enter();
3b16cf87	608	generic_smp_call_function_interrupt();
1b437c8c	609	inc_irq_stat(irq_call_count);
f87e4cac JF	610	irq_exit();
f87e4cac JF	611
f87e4cac JF	612	return IRQ_HANDLED;
	613	}
	614
3b16cf87	615	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
f87e4cac	616	{
3b16cf87 JA	617	irq_enter();
3b16cf87 JA	618	generic_smp_call_function_single_interrupt();
1b437c8c	619	inc_irq_stat(irq_call_count);
3b16cf87	620	irq_exit();
f87e4cac	621
3b16cf87	622	return IRQ_HANDLED;
f87e4cac	623	}
a9e7062d	624
1ff2b0c3 LM	625	static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
	626	{
	627	irq_enter();
	628	irq_work_run();
	629	inc_irq_stat(apic_irq_work_irqs);
	630	irq_exit();
	631
	632	return IRQ_HANDLED;
	633	}
	634
b53cedeb	635	static const struct smp_ops xen_smp_ops __initconst = {
a9e7062d JF	636	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
a9e7062d JF	637	.smp_prepare_cpus = xen_smp_prepare_cpus,
a9e7062d JF	638	.smp_cpus_done = xen_smp_cpus_done,
a9e7062d JF	639
d68d82af AN	640	.cpu_up = xen_cpu_up,
	641	.cpu_die = xen_cpu_die,
	642	.cpu_disable = xen_cpu_disable,
	643	.play_dead = xen_play_dead,
	644
76fac077	645	.stop_other_cpus = xen_stop_other_cpus,
a9e7062d JF	646	.smp_send_reschedule = xen_smp_send_reschedule,
	647
	648	.send_call_func_ipi = xen_smp_send_call_function_ipi,
	649	.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
	650	};
	651
	652	void __init xen_smp_init(void)
	653	{
	654	smp_ops = xen_smp_ops;
c7b75947	655	xen_fill_possible_map();
2d9e1e2f	656	xen_init_spinlocks();
a9e7062d	657	}
99bbb3a8 SS	658
	659	static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
	660	{
	661	native_smp_prepare_cpus(max_cpus);
	662	WARN_ON(xen_smp_intr_init(0));
	663
99bbb3a8	664	xen_init_lock_cpu(0);
99bbb3a8 SS	665	}
99bbb3a8 SS	666
5cdaf183	667	static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
99bbb3a8 SS	668	{
99bbb3a8 SS	669	int rc;
5cdaf183	670	rc = native_cpu_up(cpu, tidle);
99bbb3a8 SS	671	WARN_ON (xen_smp_intr_init(cpu));
	672	return rc;
	673	}
	674
	675	static void xen_hvm_cpu_die(unsigned int cpu)
	676	{
b12abaa1	677	xen_cpu_die(cpu);
99bbb3a8 SS	678	native_cpu_die(cpu);
	679	}
	680
	681	void __init xen_hvm_smp_init(void)
	682	{
3c05c4be SS	683	if (!xen_have_vector_callback)
3c05c4be SS	684	return;
99bbb3a8 SS	685	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
	686	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
	687	smp_ops.cpu_up = xen_hvm_cpu_up;
	688	smp_ops.cpu_die = xen_hvm_cpu_die;
	689	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
	690	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
	691	}