[mirror_ubuntu-bionic-kernel.git] / arch / arm / xen / enlighten.c

#include <xen/xen.h>
#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/hvm.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/interface/hvm/params.h>
#include <xen/features.h>
#include <xen/platform_pci.h>
#include <xen/xenbus.h>
#include <xen/page.h>
#include <xen/interface/sched.h>
#include <xen/xen-ops.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <asm/system_misc.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/cpuidle.h>
#include <linux/cpufreq.h>

#include <linux/mm.h>

struct start_info _xen_start_info;
struct start_info *xen_start_info = &_xen_start_info;
EXPORT_SYMBOL_GPL(xen_start_info);

enum xen_domain_type xen_domain_type = XEN_NATIVE;
EXPORT_SYMBOL_GPL(xen_domain_type);

struct shared_info xen_dummy_shared_info;
struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;

DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
static struct vcpu_info __percpu *xen_vcpu_info;

/* These are unused until we support booting "pre-ballooned" */
unsigned long xen_released_pages;
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;

/* TODO: to be removed */
__read_mostly int xen_have_vector_callback;
EXPORT_SYMBOL_GPL(xen_have_vector_callback);

int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);

static __read_mostly int xen_events_irq = -1;

/* map fgmfn of domid to lpfn in the current domain */
static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
			    unsigned int domid)
{
	int rc;
	struct xen_add_to_physmap_range xatp = {
		.domid = DOMID_SELF,
		.foreign_domid = domid,
		.size = 1,
		.space = XENMAPSPACE_gmfn_foreign,
	};
	xen_ulong_t idx = fgmfn;
	xen_pfn_t gpfn = lpfn;
	int err = 0;

	set_xen_guest_handle(xatp.idxs, &idx);
	set_xen_guest_handle(xatp.gpfns, &gpfn);
	set_xen_guest_handle(xatp.errs, &err);

	rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
	if (rc || err) {
		pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
			rc, err, lpfn, fgmfn);
		return 1;
	}
	return 0;
}

struct remap_data {
	xen_pfn_t fgmfn; /* foreign domain's gmfn */
	pgprot_t prot;
	domid_t  domid;
	struct vm_area_struct *vma;
	int index;
	struct page **pages;
	struct xen_remap_mfn_info *info;
};

static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
			void *data)
{
	struct remap_data *info = data;
	struct page *page = info->pages[info->index++];
	unsigned long pfn = page_to_pfn(page);
	pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));

	if (map_foreign_page(pfn, info->fgmfn, info->domid))
		return -EFAULT;
	set_pte_at(info->vma->vm_mm, addr, ptep, pte);

	return 0;
}

int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
			       unsigned long addr,
			       xen_pfn_t mfn, int nr,
			       pgprot_t prot, unsigned domid,
			       struct page **pages)
{
	int err;
	struct remap_data data;

	/* TBD: Batching, current sole caller only does page at a time */
	if (nr > 1)
		return -EINVAL;

	data.fgmfn = mfn;
	data.prot = prot;
	data.domid = domid;
	data.vma = vma;
	data.index = 0;
	data.pages = pages;
	err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
				  remap_pte_fn, &data);
	return err;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);

int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
			       int nr, struct page **pages)
{
	int i;

	for (i = 0; i < nr; i++) {
		struct xen_remove_from_physmap xrp;
		unsigned long rc, pfn;

		pfn = page_to_pfn(pages[i]);

		xrp.domid = DOMID_SELF;
		xrp.gpfn = pfn;
		rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
		if (rc) {
			pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
				pfn, rc);
			return rc;
		}
	}
	return 0;
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);

static void __init xen_percpu_init(void *unused)
{
	struct vcpu_register_vcpu_info info;
	struct vcpu_info *vcpup;
	int err;
	int cpu = get_cpu();

	pr_info("Xen: initializing cpu%d\n", cpu);
	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);

	info.mfn = __pa(vcpup) >> PAGE_SHIFT;
	info.offset = offset_in_page(vcpup);

	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
	BUG_ON(err);
	per_cpu(xen_vcpu, cpu) = vcpup;

	enable_percpu_irq(xen_events_irq, 0);
	put_cpu();
}

static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	if (rc)
		BUG();
}

static void xen_power_off(void)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	if (rc)
		BUG();
}

/*
 * see Documentation/devicetree/bindings/arm/xen.txt for the
 * documentation of the Xen Device Tree format.
 */
#define GRANT_TABLE_PHYSADDR 0
static int __init xen_guest_init(void)
{
	struct xen_add_to_physmap xatp;
	static struct shared_info *shared_info_page = 0;
	struct device_node *node;
	int len;
	const char *s = NULL;
	const char *version = NULL;
	const char *xen_prefix = "xen,xen-";
	struct resource res;
	unsigned long grant_frames;

	node = of_find_compatible_node(NULL, NULL, "xen,xen");
	if (!node) {
		pr_debug("No Xen support\n");
		return 0;
	}
	s = of_get_property(node, "compatible", &len);
	if (strlen(xen_prefix) + 3  < len &&
			!strncmp(xen_prefix, s, strlen(xen_prefix)))
		version = s + strlen(xen_prefix);
	if (version == NULL) {
		pr_debug("Xen version not found\n");
		return 0;
	}
	if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
		return 0;
	grant_frames = res.start;
	xen_events_irq = irq_of_parse_and_map(node, 0);
	pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
			version, xen_events_irq, (grant_frames >> PAGE_SHIFT));
	xen_domain_type = XEN_HVM_DOMAIN;

	xen_setup_features();
	if (xen_feature(XENFEAT_dom0))
		xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
	else
		xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);

	if (!shared_info_page)
		shared_info_page = (struct shared_info *)
			get_zeroed_page(GFP_KERNEL);
	if (!shared_info_page) {
		pr_err("not enough memory\n");
		return -ENOMEM;
	}
	xatp.domid = DOMID_SELF;
	xatp.idx = 0;
	xatp.space = XENMAPSPACE_shared_info;
	xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
		BUG();

	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;

	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
	 * page, we use it in the event channel upcall and in some pvclock
	 * related functions. 
	 * The shared info contains exactly 1 CPU (the boot CPU). The guest
	 * is required to use VCPUOP_register_vcpu_info to place vcpu info
	 * for secondary CPUs as they are brought up.
	 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
	 */
	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
			                       sizeof(struct vcpu_info));
	if (xen_vcpu_info == NULL)
		return -ENOMEM;

	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
		free_percpu(xen_vcpu_info);
		return -ENOMEM;
	}
	gnttab_init();
	if (!xen_initial_domain())
		xenbus_probe(NULL);

	/*
	 * Making sure board specific code will not set up ops for
	 * cpu idle and cpu freq.
	 */
	disable_cpuidle();
	disable_cpufreq();

	return 0;
}
core_initcall(xen_guest_init);

static int __init xen_pm_init(void)
{
	if (!xen_domain())
		return -ENODEV;

	pm_power_off = xen_power_off;
	arm_pm_restart = xen_restart;

	return 0;
}
late_initcall(xen_pm_init);

static irqreturn_t xen_arm_callback(int irq, void *arg)
{
	xen_hvm_evtchn_do_upcall();
	return IRQ_HANDLED;
}

static int __init xen_init_events(void)
{
	if (!xen_domain() || xen_events_irq < 0)
		return -ENODEV;

	xen_init_IRQ();

	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
			"events", &xen_vcpu)) {
		pr_err("Error requesting IRQ %d\n", xen_events_irq);
		return -EINVAL;
	}

	on_each_cpu(xen_percpu_init, NULL, 0);

	return 0;
}
postcore_initcall(xen_init_events);

/* In the hypervisor.S file. */
EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
EXPORT_SYMBOL_GPL(privcmd_call);
Commit	Line	Data
4c071ee5	1	#include <xen/xen.h>
0ec53ecf	2	#include <xen/events.h>
b3b52fd8 SS	3	#include <xen/grant_table.h>
b3b52fd8 SS	4	#include <xen/hvm.h>
9a9ab3cc	5	#include <xen/interface/vcpu.h>
4c071ee5 SS	6	#include <xen/interface/xen.h>
4c071ee5 SS	7	#include <xen/interface/memory.h>
b3b52fd8	8	#include <xen/interface/hvm/params.h>
ef61ee0d	9	#include <xen/features.h>
4c071ee5	10	#include <xen/platform_pci.h>
b3b52fd8	11	#include <xen/xenbus.h>
c61ba729	12	#include <xen/page.h>
6abb749e	13	#include <xen/interface/sched.h>
f832da06	14	#include <xen/xen-ops.h>
4c071ee5 SS	15	#include <asm/xen/hypervisor.h>
4c071ee5 SS	16	#include <asm/xen/hypercall.h>
6abb749e	17	#include <asm/system_misc.h>
0ec53ecf SS	18	#include <linux/interrupt.h>
0ec53ecf SS	19	#include <linux/irqreturn.h>
4c071ee5	20	#include <linux/module.h>
2e01f166 SS	21	#include <linux/of.h>
	22	#include <linux/of_irq.h>
	23	#include <linux/of_address.h>
e1a9c16b JG	24	#include <linux/cpuidle.h>
e1a9c16b JG	25	#include <linux/cpufreq.h>
4c071ee5	26
f832da06 IC	27	#include <linux/mm.h>
f832da06 IC	28
4c071ee5 SS	29	struct start_info _xen_start_info;
	30	struct start_info *xen_start_info = &_xen_start_info;
	31	EXPORT_SYMBOL_GPL(xen_start_info);
	32
	33	enum xen_domain_type xen_domain_type = XEN_NATIVE;
	34	EXPORT_SYMBOL_GPL(xen_domain_type);
	35
	36	struct shared_info xen_dummy_shared_info;
	37	struct shared_info HYPERVISOR_shared_info = (void )&xen_dummy_shared_info;
	38
	39	DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
9a9ab3cc	40	static struct vcpu_info __percpu *xen_vcpu_info;
4c071ee5	41
c61ba729 IC	42	/* These are unused until we support booting "pre-ballooned" */
	43	unsigned long xen_released_pages;
	44	struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
	45
4c071ee5 SS	46	/* TODO: to be removed */
	47	__read_mostly int xen_have_vector_callback;
	48	EXPORT_SYMBOL_GPL(xen_have_vector_callback);
	49
	50	int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
	51	EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
	52
0ec53ecf SS	53	static __read_mostly int xen_events_irq = -1;
0ec53ecf SS	54
f832da06 IC	55	/* map fgmfn of domid to lpfn in the current domain */
	56	static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
	57	unsigned int domid)
	58	{
	59	int rc;
	60	struct xen_add_to_physmap_range xatp = {
	61	.domid = DOMID_SELF,
	62	.foreign_domid = domid,
	63	.size = 1,
	64	.space = XENMAPSPACE_gmfn_foreign,
	65	};
	66	xen_ulong_t idx = fgmfn;
	67	xen_pfn_t gpfn = lpfn;
07d0c943	68	int err = 0;
f832da06 IC	69
	70	set_xen_guest_handle(xatp.idxs, &idx);
	71	set_xen_guest_handle(xatp.gpfns, &gpfn);
07d0c943	72	set_xen_guest_handle(xatp.errs, &err);
f832da06 IC	73
f832da06 IC	74	rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
07d0c943 IC	75	if (rc \|\| err) {
	76	pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
	77	rc, err, lpfn, fgmfn);
f832da06 IC	78	return 1;
	79	}
	80	return 0;
	81	}
	82
	83	struct remap_data {
	84	xen_pfn_t fgmfn; /* foreign domain's gmfn */
	85	pgprot_t prot;
	86	domid_t domid;
	87	struct vm_area_struct *vma;
	88	int index;
	89	struct page **pages;
	90	struct xen_remap_mfn_info *info;
	91	};
	92
	93	static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
	94	void *data)
	95	{
	96	struct remap_data *info = data;
	97	struct page *page = info->pages[info->index++];
	98	unsigned long pfn = page_to_pfn(page);
a7892f32	99	pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
f832da06 IC	100
	101	if (map_foreign_page(pfn, info->fgmfn, info->domid))
	102	return -EFAULT;
	103	set_pte_at(info->vma->vm_mm, addr, ptep, pte);
	104
	105	return 0;
	106	}
	107
4c071ee5 SS	108	int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
4c071ee5 SS	109	unsigned long addr,
f832da06 IC	110	xen_pfn_t mfn, int nr,
	111	pgprot_t prot, unsigned domid,
	112	struct page **pages)
4c071ee5	113	{
f832da06 IC	114	int err;
	115	struct remap_data data;
	116
	117	/* TBD: Batching, current sole caller only does page at a time */
	118	if (nr > 1)
	119	return -EINVAL;
	120
	121	data.fgmfn = mfn;
	122	data.prot = prot;
	123	data.domid = domid;
	124	data.vma = vma;
	125	data.index = 0;
	126	data.pages = pages;
	127	err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
	128	remap_pte_fn, &data);
	129	return err;
4c071ee5 SS	130	}
4c071ee5 SS	131	EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
2e01f166	132
f832da06 IC	133	int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
	134	int nr, struct page **pages)
	135	{
	136	int i;
	137
	138	for (i = 0; i < nr; i++) {
	139	struct xen_remove_from_physmap xrp;
	140	unsigned long rc, pfn;
	141
	142	pfn = page_to_pfn(pages[i]);
	143
	144	xrp.domid = DOMID_SELF;
	145	xrp.gpfn = pfn;
	146	rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
	147	if (rc) {
	148	pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
	149	pfn, rc);
	150	return rc;
	151	}
	152	}
	153	return 0;
	154	}
	155	EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
	156
3cc8e40e	157	static void __init xen_percpu_init(void *unused)
9a9ab3cc SS	158	{
	159	struct vcpu_register_vcpu_info info;
	160	struct vcpu_info *vcpup;
	161	int err;
3cc8e40e	162	int cpu = get_cpu();
9a9ab3cc SS	163
	164	pr_info("Xen: initializing cpu%d\n", cpu);
	165	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
	166
	167	info.mfn = __pa(vcpup) >> PAGE_SHIFT;
	168	info.offset = offset_in_page(vcpup);
	169
	170	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
d7266d78 SS	171	BUG_ON(err);
	172	per_cpu(xen_vcpu, cpu) = vcpup;
	173
3cc8e40e	174	enable_percpu_irq(xen_events_irq, 0);
0d7febe5	175	put_cpu();
9a9ab3cc SS	176	}
9a9ab3cc SS	177
2451ade0	178	static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
6abb749e SS	179	{
	180	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	181	int rc;
	182	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	183	if (rc)
	184	BUG();
	185	}
	186
	187	static void xen_power_off(void)
	188	{
	189	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
	190	int rc;
	191	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	192	if (rc)
	193	BUG();
	194	}
	195
2e01f166 SS	196	/*
	197	* see Documentation/devicetree/bindings/arm/xen.txt for the
	198	* documentation of the Xen Device Tree format.
	199	*/
b3b52fd8	200	#define GRANT_TABLE_PHYSADDR 0
2e01f166 SS	201	static int __init xen_guest_init(void)
	202	{
	203	struct xen_add_to_physmap xatp;
	204	static struct shared_info *shared_info_page = 0;
	205	struct device_node *node;
	206	int len;
	207	const char *s = NULL;
	208	const char *version = NULL;
	209	const char *xen_prefix = "xen,xen-";
b3b52fd8	210	struct resource res;
efaf30a3	211	unsigned long grant_frames;
2e01f166 SS	212
	213	node = of_find_compatible_node(NULL, NULL, "xen,xen");
	214	if (!node) {
	215	pr_debug("No Xen support\n");
	216	return 0;
	217	}
	218	s = of_get_property(node, "compatible", &len);
	219	if (strlen(xen_prefix) + 3 < len &&
	220	!strncmp(xen_prefix, s, strlen(xen_prefix)))
	221	version = s + strlen(xen_prefix);
	222	if (version == NULL) {
	223	pr_debug("Xen version not found\n");
	224	return 0;
	225	}
b3b52fd8 SS	226	if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
b3b52fd8 SS	227	return 0;
efaf30a3	228	grant_frames = res.start;
0ec53ecf SS	229	xen_events_irq = irq_of_parse_and_map(node, 0);
0ec53ecf SS	230	pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
efaf30a3	231	version, xen_events_irq, (grant_frames >> PAGE_SHIFT));
2e01f166 SS	232	xen_domain_type = XEN_HVM_DOMAIN;
2e01f166 SS	233
ef61ee0d SS	234	xen_setup_features();
	235	if (xen_feature(XENFEAT_dom0))
	236	xen_start_info->flags \|= SIF_INITDOMAIN\|SIF_PRIVILEGED;
	237	else
	238	xen_start_info->flags &= ~(SIF_INITDOMAIN\|SIF_PRIVILEGED);
	239
2e01f166 SS	240	if (!shared_info_page)
	241	shared_info_page = (struct shared_info *)
	242	get_zeroed_page(GFP_KERNEL);
	243	if (!shared_info_page) {
	244	pr_err("not enough memory\n");
	245	return -ENOMEM;
	246	}
	247	xatp.domid = DOMID_SELF;
	248	xatp.idx = 0;
	249	xatp.space = XENMAPSPACE_shared_info;
	250	xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
	251	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
	252	BUG();
	253
	254	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
	255
	256	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
	257	* page, we use it in the event channel upcall and in some pvclock
9a9ab3cc	258	* related functions.
2e01f166 SS	259	* The shared info contains exactly 1 CPU (the boot CPU). The guest
2e01f166 SS	260	* is required to use VCPUOP_register_vcpu_info to place vcpu info
9a9ab3cc SS	261	* for secondary CPUs as they are brought up.
	262	* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
	263	*/
	264	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
	265	sizeof(struct vcpu_info));
	266	if (xen_vcpu_info == NULL)
	267	return -ENOMEM;
b3b52fd8	268
efaf30a3 KRW	269	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
	270	free_percpu(xen_vcpu_info);
	271	return -ENOMEM;
	272	}
b3b52fd8 SS	273	gnttab_init();
	274	if (!xen_initial_domain())
	275	xenbus_probe(NULL);
	276
e1a9c16b JG	277	/*
	278	* Making sure board specific code will not set up ops for
	279	* cpu idle and cpu freq.
	280	*/
	281	disable_cpuidle();
	282	disable_cpufreq();
	283
1aa3d8d9 SS	284	return 0;
	285	}
	286	core_initcall(xen_guest_init);
	287
	288	static int __init xen_pm_init(void)
	289	{
9dd4b294 RH	290	if (!xen_domain())
	291	return -ENODEV;
	292
6abb749e SS	293	pm_power_off = xen_power_off;
	294	arm_pm_restart = xen_restart;
	295
2e01f166 SS	296	return 0;
2e01f166 SS	297	}
9dd4b294	298	late_initcall(xen_pm_init);
0ec53ecf SS	299
	300	static irqreturn_t xen_arm_callback(int irq, void *arg)
	301	{
	302	xen_hvm_evtchn_do_upcall();
	303	return IRQ_HANDLED;
	304	}
	305
	306	static int __init xen_init_events(void)
	307	{
	308	if (!xen_domain() \|\| xen_events_irq < 0)
	309	return -ENODEV;
	310
	311	xen_init_IRQ();
	312
	313	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
2798ba7d	314	"events", &xen_vcpu)) {
0ec53ecf SS	315	pr_err("Error requesting IRQ %d\n", xen_events_irq);
	316	return -EINVAL;
	317	}
	318
3cc8e40e	319	on_each_cpu(xen_percpu_init, NULL, 0);
0ec53ecf SS	320
	321	return 0;
	322	}
	323	postcore_initcall(xen_init_events);
ea54209b	324
911dec0d KRW	325	/* In the hypervisor.S file. */
	326	EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
	327	EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
ab277bbf SS	328	EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
	329	EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
	330	EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
	331	EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
	332	EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
	333	EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
ea0af613	334	EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
176455e9	335	EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
911dec0d	336	EXPORT_SYMBOL_GPL(privcmd_call);