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1#include <xen/xen.h>
2#include <xen/events.h>
3#include <xen/grant_table.h>
4#include <xen/hvm.h>
5#include <xen/interface/vcpu.h>
6#include <xen/interface/xen.h>
7#include <xen/interface/memory.h>
8#include <xen/interface/hvm/params.h>
9#include <xen/features.h>
10#include <xen/platform_pci.h>
11#include <xen/xenbus.h>
12#include <xen/page.h>
13#include <xen/interface/sched.h>
14#include <xen/xen-ops.h>
15#include <asm/xen/hypervisor.h>
16#include <asm/xen/hypercall.h>
17#include <asm/system_misc.h>
18#include <linux/interrupt.h>
19#include <linux/irqreturn.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_irq.h>
23#include <linux/of_address.h>
24#include <linux/cpuidle.h>
25#include <linux/cpufreq.h>
26#include <linux/cpu.h>
27
28#include <linux/mm.h>
29
30struct start_info _xen_start_info;
31struct start_info *xen_start_info = &_xen_start_info;
32EXPORT_SYMBOL_GPL(xen_start_info);
33
34enum xen_domain_type xen_domain_type = XEN_NATIVE;
35EXPORT_SYMBOL_GPL(xen_domain_type);
36
37struct shared_info xen_dummy_shared_info;
38struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
39
40DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
41static struct vcpu_info __percpu *xen_vcpu_info;
42
43/* These are unused until we support booting "pre-ballooned" */
44unsigned long xen_released_pages;
45struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
46
47/* TODO: to be removed */
48__read_mostly int xen_have_vector_callback;
49EXPORT_SYMBOL_GPL(xen_have_vector_callback);
50
51int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
52EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
53
54static __read_mostly int xen_events_irq = -1;
55
56/* map fgmfn of domid to lpfn in the current domain */
57static 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;
69 int err = 0;
70
71 set_xen_guest_handle(xatp.idxs, &idx);
72 set_xen_guest_handle(xatp.gpfns, &gpfn);
73 set_xen_guest_handle(xatp.errs, &err);
74
75 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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);
79 return 1;
80 }
81 return 0;
82}
83
84struct 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
94static 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);
100 pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
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
109int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
110 unsigned long addr,
111 xen_pfn_t mfn, int nr,
112 pgprot_t prot, unsigned domid,
113 struct page **pages)
114{
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;
131}
132EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
133
134int 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}
156EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
157
158static void xen_percpu_init(void)
159{
160 struct vcpu_register_vcpu_info info;
161 struct vcpu_info *vcpup;
162 int err;
163 int cpu = get_cpu();
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);
172 BUG_ON(err);
173 per_cpu(xen_vcpu, cpu) = vcpup;
174
175 enable_percpu_irq(xen_events_irq, 0);
176 put_cpu();
177}
178
179static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
180{
181 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
182 int rc;
183 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
184 if (rc)
185 BUG();
186}
187
188static void xen_power_off(void)
189{
190 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
191 int rc;
192 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
193 if (rc)
194 BUG();
195}
196
197static int xen_cpu_notification(struct notifier_block *self,
198 unsigned long action,
199 void *hcpu)
200{
201 switch (action) {
202 case CPU_STARTING:
203 xen_percpu_init();
204 break;
205 default:
206 break;
207 }
208
209 return NOTIFY_OK;
210}
211
212static struct notifier_block xen_cpu_notifier = {
213 .notifier_call = xen_cpu_notification,
214};
215
216static irqreturn_t xen_arm_callback(int irq, void *arg)
217{
218 xen_hvm_evtchn_do_upcall();
219 return IRQ_HANDLED;
220}
221
222/*
223 * see Documentation/devicetree/bindings/arm/xen.txt for the
224 * documentation of the Xen Device Tree format.
225 */
226#define GRANT_TABLE_PHYSADDR 0
227static int __init xen_guest_init(void)
228{
229 struct xen_add_to_physmap xatp;
230 static struct shared_info *shared_info_page = 0;
231 struct device_node *node;
232 int len;
233 const char *s = NULL;
234 const char *version = NULL;
235 const char *xen_prefix = "xen,xen-";
236 struct resource res;
237 phys_addr_t grant_frames;
238
239 node = of_find_compatible_node(NULL, NULL, "xen,xen");
240 if (!node) {
241 pr_debug("No Xen support\n");
242 return 0;
243 }
244 s = of_get_property(node, "compatible", &len);
245 if (strlen(xen_prefix) + 3 < len &&
246 !strncmp(xen_prefix, s, strlen(xen_prefix)))
247 version = s + strlen(xen_prefix);
248 if (version == NULL) {
249 pr_debug("Xen version not found\n");
250 return 0;
251 }
252 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
253 return 0;
254 grant_frames = res.start;
255 xen_events_irq = irq_of_parse_and_map(node, 0);
256 pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
257 version, xen_events_irq, &grant_frames);
258
259 if (xen_events_irq < 0)
260 return -ENODEV;
261
262 xen_domain_type = XEN_HVM_DOMAIN;
263
264 xen_setup_features();
265 if (xen_feature(XENFEAT_dom0))
266 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
267 else
268 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
269
270 if (!shared_info_page)
271 shared_info_page = (struct shared_info *)
272 get_zeroed_page(GFP_KERNEL);
273 if (!shared_info_page) {
274 pr_err("not enough memory\n");
275 return -ENOMEM;
276 }
277 xatp.domid = DOMID_SELF;
278 xatp.idx = 0;
279 xatp.space = XENMAPSPACE_shared_info;
280 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
281 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
282 BUG();
283
284 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
285
286 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
287 * page, we use it in the event channel upcall and in some pvclock
288 * related functions.
289 * The shared info contains exactly 1 CPU (the boot CPU). The guest
290 * is required to use VCPUOP_register_vcpu_info to place vcpu info
291 * for secondary CPUs as they are brought up.
292 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
293 */
294 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
295 sizeof(struct vcpu_info));
296 if (xen_vcpu_info == NULL)
297 return -ENOMEM;
298
299 if (gnttab_setup_auto_xlat_frames(grant_frames)) {
300 free_percpu(xen_vcpu_info);
301 return -ENOMEM;
302 }
303 gnttab_init();
304 if (!xen_initial_domain())
305 xenbus_probe(NULL);
306
307 /*
308 * Making sure board specific code will not set up ops for
309 * cpu idle and cpu freq.
310 */
311 disable_cpuidle();
312 disable_cpufreq();
313
314 xen_init_IRQ();
315
316 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
317 "events", &xen_vcpu)) {
318 pr_err("Error request IRQ %d\n", xen_events_irq);
319 return -EINVAL;
320 }
321
322 xen_percpu_init();
323
324 register_cpu_notifier(&xen_cpu_notifier);
325
326 return 0;
327}
328early_initcall(xen_guest_init);
329
330static int __init xen_pm_init(void)
331{
332 if (!xen_domain())
333 return -ENODEV;
334
335 pm_power_off = xen_power_off;
336 arm_pm_restart = xen_restart;
337
338 return 0;
339}
340late_initcall(xen_pm_init);
341
342/* In the hypervisor.S file. */
343EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
344EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
345EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
346EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
347EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
348EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
349EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
350EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
351EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
352EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
353EXPORT_SYMBOL_GPL(privcmd_call);
1// SPDX-License-Identifier: GPL-2.0-only
2#include <xen/xen.h>
3#include <xen/events.h>
4#include <xen/grant_table.h>
5#include <xen/hvm.h>
6#include <xen/interface/vcpu.h>
7#include <xen/interface/xen.h>
8#include <xen/interface/memory.h>
9#include <xen/interface/hvm/params.h>
10#include <xen/features.h>
11#include <xen/platform_pci.h>
12#include <xen/xenbus.h>
13#include <xen/page.h>
14#include <xen/interface/sched.h>
15#include <xen/xen-ops.h>
16#include <asm/xen/hypervisor.h>
17#include <asm/xen/hypercall.h>
18#include <asm/system_misc.h>
19#include <asm/efi.h>
20#include <linux/interrupt.h>
21#include <linux/irqreturn.h>
22#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/of_fdt.h>
25#include <linux/of_irq.h>
26#include <linux/of_address.h>
27#include <linux/cpuidle.h>
28#include <linux/cpufreq.h>
29#include <linux/cpu.h>
30#include <linux/console.h>
31#include <linux/pvclock_gtod.h>
32#include <linux/time64.h>
33#include <linux/timekeeping.h>
34#include <linux/timekeeper_internal.h>
35#include <linux/acpi.h>
36
37#include <linux/mm.h>
38
39static struct start_info _xen_start_info;
40struct start_info *xen_start_info = &_xen_start_info;
41EXPORT_SYMBOL(xen_start_info);
42
43enum xen_domain_type xen_domain_type = XEN_NATIVE;
44EXPORT_SYMBOL(xen_domain_type);
45
46struct shared_info xen_dummy_shared_info;
47struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
48
49DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
50static struct vcpu_info __percpu *xen_vcpu_info;
51
52/* Linux <-> Xen vCPU id mapping */
53DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
54EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
55
56/* These are unused until we support booting "pre-ballooned" */
57unsigned long xen_released_pages;
58struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
59
60static __read_mostly unsigned int xen_events_irq;
61
62uint32_t xen_start_flags;
63EXPORT_SYMBOL(xen_start_flags);
64
65int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
66 int nr, struct page **pages)
67{
68 return xen_xlate_unmap_gfn_range(vma, nr, pages);
69}
70EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
71
72static void xen_read_wallclock(struct timespec64 *ts)
73{
74 u32 version;
75 struct timespec64 now, ts_monotonic;
76 struct shared_info *s = HYPERVISOR_shared_info;
77 struct pvclock_wall_clock *wall_clock = &(s->wc);
78
79 /* get wallclock at system boot */
80 do {
81 version = wall_clock->version;
82 rmb(); /* fetch version before time */
83 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
84 now.tv_nsec = wall_clock->nsec;
85 rmb(); /* fetch time before checking version */
86 } while ((wall_clock->version & 1) || (version != wall_clock->version));
87
88 /* time since system boot */
89 ktime_get_ts64(&ts_monotonic);
90 *ts = timespec64_add(now, ts_monotonic);
91}
92
93static int xen_pvclock_gtod_notify(struct notifier_block *nb,
94 unsigned long was_set, void *priv)
95{
96 /* Protected by the calling core code serialization */
97 static struct timespec64 next_sync;
98
99 struct xen_platform_op op;
100 struct timespec64 now, system_time;
101 struct timekeeper *tk = priv;
102
103 now.tv_sec = tk->xtime_sec;
104 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
105 system_time = timespec64_add(now, tk->wall_to_monotonic);
106
107 /*
108 * We only take the expensive HV call when the clock was set
109 * or when the 11 minutes RTC synchronization time elapsed.
110 */
111 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
112 return NOTIFY_OK;
113
114 op.cmd = XENPF_settime64;
115 op.u.settime64.mbz = 0;
116 op.u.settime64.secs = now.tv_sec;
117 op.u.settime64.nsecs = now.tv_nsec;
118 op.u.settime64.system_time = timespec64_to_ns(&system_time);
119 (void)HYPERVISOR_platform_op(&op);
120
121 /*
122 * Move the next drift compensation time 11 minutes
123 * ahead. That's emulating the sync_cmos_clock() update for
124 * the hardware RTC.
125 */
126 next_sync = now;
127 next_sync.tv_sec += 11 * 60;
128
129 return NOTIFY_OK;
130}
131
132static struct notifier_block xen_pvclock_gtod_notifier = {
133 .notifier_call = xen_pvclock_gtod_notify,
134};
135
136static int xen_starting_cpu(unsigned int cpu)
137{
138 struct vcpu_register_vcpu_info info;
139 struct vcpu_info *vcpup;
140 int err;
141
142 /*
143 * VCPUOP_register_vcpu_info cannot be called twice for the same
144 * vcpu, so if vcpu_info is already registered, just get out. This
145 * can happen with cpu-hotplug.
146 */
147 if (per_cpu(xen_vcpu, cpu) != NULL)
148 goto after_register_vcpu_info;
149
150 pr_info("Xen: initializing cpu%d\n", cpu);
151 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
152
153 info.mfn = percpu_to_gfn(vcpup);
154 info.offset = xen_offset_in_page(vcpup);
155
156 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
157 &info);
158 BUG_ON(err);
159 per_cpu(xen_vcpu, cpu) = vcpup;
160
161 xen_setup_runstate_info(cpu);
162
163after_register_vcpu_info:
164 enable_percpu_irq(xen_events_irq, 0);
165 return 0;
166}
167
168static int xen_dying_cpu(unsigned int cpu)
169{
170 disable_percpu_irq(xen_events_irq);
171 return 0;
172}
173
174void xen_reboot(int reason)
175{
176 struct sched_shutdown r = { .reason = reason };
177 int rc;
178
179 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
180 BUG_ON(rc);
181}
182
183static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
184{
185 xen_reboot(SHUTDOWN_reboot);
186}
187
188
189static void xen_power_off(void)
190{
191 xen_reboot(SHUTDOWN_poweroff);
192}
193
194static irqreturn_t xen_arm_callback(int irq, void *arg)
195{
196 xen_hvm_evtchn_do_upcall();
197 return IRQ_HANDLED;
198}
199
200static __initdata struct {
201 const char *compat;
202 const char *prefix;
203 const char *version;
204 bool found;
205} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
206
207static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
208 int depth, void *data)
209{
210 const void *s = NULL;
211 int len;
212
213 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
214 return 0;
215
216 if (of_flat_dt_is_compatible(node, hyper_node.compat))
217 hyper_node.found = true;
218
219 s = of_get_flat_dt_prop(node, "compatible", &len);
220 if (strlen(hyper_node.prefix) + 3 < len &&
221 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
222 hyper_node.version = s + strlen(hyper_node.prefix);
223
224 /*
225 * Check if Xen supports EFI by checking whether there is the
226 * "/hypervisor/uefi" node in DT. If so, runtime services are available
227 * through proxy functions (e.g. in case of Xen dom0 EFI implementation
228 * they call special hypercall which executes relevant EFI functions)
229 * and that is why they are always enabled.
230 */
231 if (IS_ENABLED(CONFIG_XEN_EFI)) {
232 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
233 !efi_runtime_disabled())
234 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
235 }
236
237 return 0;
238}
239
240/*
241 * see Documentation/devicetree/bindings/arm/xen.txt for the
242 * documentation of the Xen Device Tree format.
243 */
244void __init xen_early_init(void)
245{
246 of_scan_flat_dt(fdt_find_hyper_node, NULL);
247 if (!hyper_node.found) {
248 pr_debug("No Xen support\n");
249 return;
250 }
251
252 if (hyper_node.version == NULL) {
253 pr_debug("Xen version not found\n");
254 return;
255 }
256
257 pr_info("Xen %s support found\n", hyper_node.version);
258
259 xen_domain_type = XEN_HVM_DOMAIN;
260
261 xen_setup_features();
262
263 if (xen_feature(XENFEAT_dom0))
264 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
265
266 if (!console_set_on_cmdline && !xen_initial_domain())
267 add_preferred_console("hvc", 0, NULL);
268}
269
270static void __init xen_acpi_guest_init(void)
271{
272#ifdef CONFIG_ACPI
273 struct xen_hvm_param a;
274 int interrupt, trigger, polarity;
275
276 a.domid = DOMID_SELF;
277 a.index = HVM_PARAM_CALLBACK_IRQ;
278
279 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
280 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
281 xen_events_irq = 0;
282 return;
283 }
284
285 interrupt = a.value & 0xff;
286 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
287 : ACPI_LEVEL_SENSITIVE;
288 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
289 : ACPI_ACTIVE_HIGH;
290 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
291#endif
292}
293
294static void __init xen_dt_guest_init(void)
295{
296 struct device_node *xen_node;
297
298 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
299 if (!xen_node) {
300 pr_err("Xen support was detected before, but it has disappeared\n");
301 return;
302 }
303
304 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
305}
306
307static int __init xen_guest_init(void)
308{
309 struct xen_add_to_physmap xatp;
310 struct shared_info *shared_info_page = NULL;
311 int cpu;
312
313 if (!xen_domain())
314 return 0;
315
316 if (!acpi_disabled)
317 xen_acpi_guest_init();
318 else
319 xen_dt_guest_init();
320
321 if (!xen_events_irq) {
322 pr_err("Xen event channel interrupt not found\n");
323 return -ENODEV;
324 }
325
326 /*
327 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
328 * parameters are found. Force enable runtime services.
329 */
330 if (efi_enabled(EFI_RUNTIME_SERVICES))
331 xen_efi_runtime_setup();
332
333 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
334
335 if (!shared_info_page) {
336 pr_err("not enough memory\n");
337 return -ENOMEM;
338 }
339 xatp.domid = DOMID_SELF;
340 xatp.idx = 0;
341 xatp.space = XENMAPSPACE_shared_info;
342 xatp.gpfn = virt_to_gfn(shared_info_page);
343 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
344 BUG();
345
346 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
347
348 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
349 * page, we use it in the event channel upcall and in some pvclock
350 * related functions.
351 * The shared info contains exactly 1 CPU (the boot CPU). The guest
352 * is required to use VCPUOP_register_vcpu_info to place vcpu info
353 * for secondary CPUs as they are brought up.
354 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
355 */
356 xen_vcpu_info = alloc_percpu(struct vcpu_info);
357 if (xen_vcpu_info == NULL)
358 return -ENOMEM;
359
360 /* Direct vCPU id mapping for ARM guests. */
361 for_each_possible_cpu(cpu)
362 per_cpu(xen_vcpu_id, cpu) = cpu;
363
364 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
365 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
366 &xen_auto_xlat_grant_frames.vaddr,
367 xen_auto_xlat_grant_frames.count)) {
368 free_percpu(xen_vcpu_info);
369 return -ENOMEM;
370 }
371 gnttab_init();
372 if (!xen_initial_domain())
373 xenbus_probe(NULL);
374
375 /*
376 * Making sure board specific code will not set up ops for
377 * cpu idle and cpu freq.
378 */
379 disable_cpuidle();
380 disable_cpufreq();
381
382 xen_init_IRQ();
383
384 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
385 "events", &xen_vcpu)) {
386 pr_err("Error request IRQ %d\n", xen_events_irq);
387 return -EINVAL;
388 }
389
390 xen_time_setup_guest();
391
392 if (xen_initial_domain())
393 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
394
395 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
396 "arm/xen:starting", xen_starting_cpu,
397 xen_dying_cpu);
398}
399early_initcall(xen_guest_init);
400
401static int __init xen_pm_init(void)
402{
403 if (!xen_domain())
404 return -ENODEV;
405
406 pm_power_off = xen_power_off;
407 arm_pm_restart = xen_restart;
408 if (!xen_initial_domain()) {
409 struct timespec64 ts;
410 xen_read_wallclock(&ts);
411 do_settimeofday64(&ts);
412 }
413
414 return 0;
415}
416late_initcall(xen_pm_init);
417
418
419/* empty stubs */
420void xen_arch_pre_suspend(void) { }
421void xen_arch_post_suspend(int suspend_cancelled) { }
422void xen_timer_resume(void) { }
423void xen_arch_resume(void) { }
424void xen_arch_suspend(void) { }
425
426
427/* In the hypercall.S file. */
428EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
429EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
430EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
431EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
432EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
433EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
434EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
435EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
436EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
437EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
438EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
439EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
440EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
441EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
442EXPORT_SYMBOL_GPL(privcmd_call);