[deliverable/linux.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/cpu.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 xen_percpu_init(void)
{
	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);
	BUG_ON(rc);
}

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

static int xen_cpu_notification(struct notifier_block *self,
				unsigned long action,
				void *hcpu)
{
	switch (action) {
	case CPU_STARTING:
		xen_percpu_init();
		break;
	default:
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block xen_cpu_notifier = {
	.notifier_call = xen_cpu_notification,
};

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

/*
 * 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;
	phys_addr_t 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=%pa\n",
			version, xen_events_irq, &grant_frames);

	if (xen_events_irq < 0)
		return -ENODEV;

	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();

	xen_init_IRQ();

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

	xen_percpu_init();

	register_cpu_notifier(&xen_cpu_notifier);

	return 0;
}
early_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);


/* empty stubs */
void xen_arch_pre_suspend(void) { }
void xen_arch_post_suspend(int suspend_cancelled) { }
void xen_timer_resume(void) { }
void xen_arch_resume(void) { }


/* 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(HYPERVISOR_multicall);
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>
8b271d57	26	#include <linux/cpu.h>
4c071ee5	27
f832da06 IC	28	#include <linux/mm.h>
f832da06 IC	29
4c071ee5 SS	30	struct start_info _xen_start_info;
	31	struct start_info *xen_start_info = &_xen_start_info;
	32	EXPORT_SYMBOL_GPL(xen_start_info);
	33
	34	enum xen_domain_type xen_domain_type = XEN_NATIVE;
	35	EXPORT_SYMBOL_GPL(xen_domain_type);
	36
	37	struct shared_info xen_dummy_shared_info;
	38	struct shared_info HYPERVISOR_shared_info = (void )&xen_dummy_shared_info;
	39
	40	DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
9a9ab3cc	41	static struct vcpu_info __percpu *xen_vcpu_info;
4c071ee5	42
c61ba729 IC	43	/* These are unused until we support booting "pre-ballooned" */
	44	unsigned long xen_released_pages;
	45	struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
	46
4c071ee5 SS	47	/* TODO: to be removed */
	48	__read_mostly int xen_have_vector_callback;
	49	EXPORT_SYMBOL_GPL(xen_have_vector_callback);
	50
	51	int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
	52	EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
	53
0ec53ecf SS	54	static __read_mostly int xen_events_irq = -1;
0ec53ecf SS	55
f832da06 IC	56	/* map fgmfn of domid to lpfn in the current domain */
	57	static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
	58	unsigned int domid)
	59	{
	60	int rc;
	61	struct xen_add_to_physmap_range xatp = {
	62	.domid = DOMID_SELF,
	63	.foreign_domid = domid,
	64	.size = 1,
	65	.space = XENMAPSPACE_gmfn_foreign,
	66	};
	67	xen_ulong_t idx = fgmfn;
	68	xen_pfn_t gpfn = lpfn;
07d0c943	69	int err = 0;
f832da06 IC	70
	71	set_xen_guest_handle(xatp.idxs, &idx);
	72	set_xen_guest_handle(xatp.gpfns, &gpfn);
07d0c943	73	set_xen_guest_handle(xatp.errs, &err);
f832da06 IC	74
f832da06 IC	75	rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
07d0c943 IC	76	if (rc \|\| err) {
	77	pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
	78	rc, err, lpfn, fgmfn);
f832da06 IC	79	return 1;
	80	}
	81	return 0;
	82	}
	83
	84	struct remap_data {
	85	xen_pfn_t fgmfn; /* foreign domain's gmfn */
	86	pgprot_t prot;
	87	domid_t domid;
	88	struct vm_area_struct *vma;
	89	int index;
	90	struct page **pages;
	91	struct xen_remap_mfn_info *info;
	92	};
	93
	94	static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
	95	void *data)
	96	{
	97	struct remap_data *info = data;
	98	struct page *page = info->pages[info->index++];
	99	unsigned long pfn = page_to_pfn(page);
a7892f32	100	pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
f832da06 IC	101
	102	if (map_foreign_page(pfn, info->fgmfn, info->domid))
	103	return -EFAULT;
	104	set_pte_at(info->vma->vm_mm, addr, ptep, pte);
	105
	106	return 0;
	107	}
	108
4c071ee5 SS	109	int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
4c071ee5 SS	110	unsigned long addr,
f832da06 IC	111	xen_pfn_t mfn, int nr,
	112	pgprot_t prot, unsigned domid,
	113	struct page **pages)
4c071ee5	114	{
f832da06 IC	115	int err;
	116	struct remap_data data;
	117
	118	/* TBD: Batching, current sole caller only does page at a time */
	119	if (nr > 1)
	120	return -EINVAL;
	121
	122	data.fgmfn = mfn;
	123	data.prot = prot;
	124	data.domid = domid;
	125	data.vma = vma;
	126	data.index = 0;
	127	data.pages = pages;
	128	err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
	129	remap_pte_fn, &data);
	130	return err;
4c071ee5 SS	131	}
4c071ee5 SS	132	EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
2e01f166	133
f832da06 IC	134	int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
	135	int nr, struct page **pages)
	136	{
	137	int i;
	138
	139	for (i = 0; i < nr; i++) {
	140	struct xen_remove_from_physmap xrp;
	141	unsigned long rc, pfn;
	142
	143	pfn = page_to_pfn(pages[i]);
	144
	145	xrp.domid = DOMID_SELF;
	146	xrp.gpfn = pfn;
	147	rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
	148	if (rc) {
	149	pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
	150	pfn, rc);
	151	return rc;
	152	}
	153	}
	154	return 0;
	155	}
	156	EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
	157
8b271d57	158	static void xen_percpu_init(void)
9a9ab3cc SS	159	{
	160	struct vcpu_register_vcpu_info info;
	161	struct vcpu_info *vcpup;
	162	int err;
3cc8e40e	163	int cpu = get_cpu();
9a9ab3cc SS	164
	165	pr_info("Xen: initializing cpu%d\n", cpu);
	166	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
	167
	168	info.mfn = __pa(vcpup) >> PAGE_SHIFT;
	169	info.offset = offset_in_page(vcpup);
	170
	171	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
d7266d78 SS	172	BUG_ON(err);
	173	per_cpu(xen_vcpu, cpu) = vcpup;
	174
3cc8e40e	175	enable_percpu_irq(xen_events_irq, 0);
0d7febe5	176	put_cpu();
9a9ab3cc SS	177	}
9a9ab3cc SS	178
2451ade0	179	static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
6abb749e SS	180	{
	181	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	182	int rc;
	183	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
a91c7775	184	BUG_ON(rc);
6abb749e SS	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);
a91c7775	192	BUG_ON(rc);
6abb749e SS	193	}
6abb749e SS	194
8b271d57 JG	195	static int xen_cpu_notification(struct notifier_block *self,
	196	unsigned long action,
	197	void *hcpu)
	198	{
	199	switch (action) {
	200	case CPU_STARTING:
	201	xen_percpu_init();
	202	break;
	203	default:
	204	break;
	205	}
	206
	207	return NOTIFY_OK;
	208	}
	209
	210	static struct notifier_block xen_cpu_notifier = {
	211	.notifier_call = xen_cpu_notification,
	212	};
	213
	214	static irqreturn_t xen_arm_callback(int irq, void *arg)
	215	{
	216	xen_hvm_evtchn_do_upcall();
	217	return IRQ_HANDLED;
	218	}
	219
2e01f166 SS	220	/*
	221	* see Documentation/devicetree/bindings/arm/xen.txt for the
	222	* documentation of the Xen Device Tree format.
	223	*/
b3b52fd8	224	#define GRANT_TABLE_PHYSADDR 0
2e01f166 SS	225	static int __init xen_guest_init(void)
	226	{
	227	struct xen_add_to_physmap xatp;
	228	static struct shared_info *shared_info_page = 0;
	229	struct device_node *node;
	230	int len;
	231	const char *s = NULL;
	232	const char *version = NULL;
	233	const char *xen_prefix = "xen,xen-";
b3b52fd8	234	struct resource res;
47c54205	235	phys_addr_t grant_frames;
2e01f166 SS	236
	237	node = of_find_compatible_node(NULL, NULL, "xen,xen");
	238	if (!node) {
	239	pr_debug("No Xen support\n");
	240	return 0;
	241	}
	242	s = of_get_property(node, "compatible", &len);
	243	if (strlen(xen_prefix) + 3 < len &&
	244	!strncmp(xen_prefix, s, strlen(xen_prefix)))
	245	version = s + strlen(xen_prefix);
	246	if (version == NULL) {
	247	pr_debug("Xen version not found\n");
	248	return 0;
	249	}
b3b52fd8 SS	250	if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
b3b52fd8 SS	251	return 0;
efaf30a3	252	grant_frames = res.start;
0ec53ecf	253	xen_events_irq = irq_of_parse_and_map(node, 0);
47c54205 JG	254	pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
47c54205 JG	255	version, xen_events_irq, &grant_frames);
8b271d57 JG	256
	257	if (xen_events_irq < 0)
	258	return -ENODEV;
	259
2e01f166 SS	260	xen_domain_type = XEN_HVM_DOMAIN;
2e01f166 SS	261
ef61ee0d	262	xen_setup_features();
5ebc77de	263
ef61ee0d SS	264	if (xen_feature(XENFEAT_dom0))
	265	xen_start_info->flags \|= SIF_INITDOMAIN\|SIF_PRIVILEGED;
	266	else
	267	xen_start_info->flags &= ~(SIF_INITDOMAIN\|SIF_PRIVILEGED);
	268
2e01f166 SS	269	if (!shared_info_page)
	270	shared_info_page = (struct shared_info *)
	271	get_zeroed_page(GFP_KERNEL);
	272	if (!shared_info_page) {
	273	pr_err("not enough memory\n");
	274	return -ENOMEM;
	275	}
	276	xatp.domid = DOMID_SELF;
	277	xatp.idx = 0;
	278	xatp.space = XENMAPSPACE_shared_info;
	279	xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
	280	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
	281	BUG();
	282
	283	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
	284
	285	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
	286	* page, we use it in the event channel upcall and in some pvclock
9a9ab3cc	287	* related functions.
2e01f166 SS	288	* The shared info contains exactly 1 CPU (the boot CPU). The guest
2e01f166 SS	289	* is required to use VCPUOP_register_vcpu_info to place vcpu info
9a9ab3cc SS	290	* for secondary CPUs as they are brought up.
	291	* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
	292	*/
	293	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
	294	sizeof(struct vcpu_info));
	295	if (xen_vcpu_info == NULL)
	296	return -ENOMEM;
b3b52fd8	297
efaf30a3 KRW	298	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
	299	free_percpu(xen_vcpu_info);
	300	return -ENOMEM;
	301	}
b3b52fd8 SS	302	gnttab_init();
	303	if (!xen_initial_domain())
	304	xenbus_probe(NULL);
	305
e1a9c16b JG	306	/*
	307	* Making sure board specific code will not set up ops for
	308	* cpu idle and cpu freq.
	309	*/
	310	disable_cpuidle();
	311	disable_cpufreq();
	312
8b271d57 JG	313	xen_init_IRQ();
	314
	315	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
	316	"events", &xen_vcpu)) {
	317	pr_err("Error request IRQ %d\n", xen_events_irq);
	318	return -EINVAL;
	319	}
	320
	321	xen_percpu_init();
	322
	323	register_cpu_notifier(&xen_cpu_notifier);
	324
1aa3d8d9 SS	325	return 0;
1aa3d8d9 SS	326	}
8b271d57	327	early_initcall(xen_guest_init);
1aa3d8d9 SS	328
	329	static int __init xen_pm_init(void)
	330	{
9dd4b294 RH	331	if (!xen_domain())
	332	return -ENODEV;
	333
6abb749e SS	334	pm_power_off = xen_power_off;
	335	arm_pm_restart = xen_restart;
	336
2e01f166 SS	337	return 0;
2e01f166 SS	338	}
9dd4b294	339	late_initcall(xen_pm_init);
0ec53ecf	340
79390289 SS	341
	342	/* empty stubs */
	343	void xen_arch_pre_suspend(void) { }
	344	void xen_arch_post_suspend(int suspend_cancelled) { }
	345	void xen_timer_resume(void) { }
	346	void xen_arch_resume(void) { }
	347
	348
911dec0d KRW	349	/* In the hypervisor.S file. */
	350	EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
	351	EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
ab277bbf SS	352	EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
	353	EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
	354	EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
	355	EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
	356	EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
	357	EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
ea0af613	358	EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
176455e9	359	EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
9f1d3414	360	EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
911dec0d	361	EXPORT_SYMBOL_GPL(privcmd_call);