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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/xen/xen-ops.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
39struct 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
62int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
63 unsigned long addr,
64 xen_pfn_t *gfn, int nr,
65 int *err_ptr, pgprot_t prot,
66 unsigned domid,
67 struct page **pages)
68{
69 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
70 prot, domid, pages);
71}
72EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
73
74/* Not used by XENFEAT_auto_translated guests. */
75int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
76 unsigned long addr,
77 xen_pfn_t gfn, int nr,
78 pgprot_t prot, unsigned domid,
79 struct page **pages)
80{
81 return -ENOSYS;
82}
83EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
84
85int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
86 int nr, struct page **pages)
87{
88 return xen_xlate_unmap_gfn_range(vma, nr, pages);
89}
90EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
91
92static void xen_read_wallclock(struct timespec64 *ts)
93{
94 u32 version;
95 struct timespec64 now, ts_monotonic;
96 struct shared_info *s = HYPERVISOR_shared_info;
97 struct pvclock_wall_clock *wall_clock = &(s->wc);
98
99 /* get wallclock at system boot */
100 do {
101 version = wall_clock->version;
102 rmb(); /* fetch version before time */
103 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
104 now.tv_nsec = wall_clock->nsec;
105 rmb(); /* fetch time before checking version */
106 } while ((wall_clock->version & 1) || (version != wall_clock->version));
107
108 /* time since system boot */
109 ktime_get_ts64(&ts_monotonic);
110 *ts = timespec64_add(now, ts_monotonic);
111}
112
113static int xen_pvclock_gtod_notify(struct notifier_block *nb,
114 unsigned long was_set, void *priv)
115{
116 /* Protected by the calling core code serialization */
117 static struct timespec64 next_sync;
118
119 struct xen_platform_op op;
120 struct timespec64 now, system_time;
121 struct timekeeper *tk = priv;
122
123 now.tv_sec = tk->xtime_sec;
124 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
125 system_time = timespec64_add(now, tk->wall_to_monotonic);
126
127 /*
128 * We only take the expensive HV call when the clock was set
129 * or when the 11 minutes RTC synchronization time elapsed.
130 */
131 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
132 return NOTIFY_OK;
133
134 op.cmd = XENPF_settime64;
135 op.u.settime64.mbz = 0;
136 op.u.settime64.secs = now.tv_sec;
137 op.u.settime64.nsecs = now.tv_nsec;
138 op.u.settime64.system_time = timespec64_to_ns(&system_time);
139 (void)HYPERVISOR_platform_op(&op);
140
141 /*
142 * Move the next drift compensation time 11 minutes
143 * ahead. That's emulating the sync_cmos_clock() update for
144 * the hardware RTC.
145 */
146 next_sync = now;
147 next_sync.tv_sec += 11 * 60;
148
149 return NOTIFY_OK;
150}
151
152static struct notifier_block xen_pvclock_gtod_notifier = {
153 .notifier_call = xen_pvclock_gtod_notify,
154};
155
156static int xen_starting_cpu(unsigned int cpu)
157{
158 struct vcpu_register_vcpu_info info;
159 struct vcpu_info *vcpup;
160 int err;
161
162 /*
163 * VCPUOP_register_vcpu_info cannot be called twice for the same
164 * vcpu, so if vcpu_info is already registered, just get out. This
165 * can happen with cpu-hotplug.
166 */
167 if (per_cpu(xen_vcpu, cpu) != NULL)
168 goto after_register_vcpu_info;
169
170 pr_info("Xen: initializing cpu%d\n", cpu);
171 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
172
173 info.mfn = virt_to_gfn(vcpup);
174 info.offset = xen_offset_in_page(vcpup);
175
176 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
177 &info);
178 BUG_ON(err);
179 per_cpu(xen_vcpu, cpu) = vcpup;
180
181 xen_setup_runstate_info(cpu);
182
183after_register_vcpu_info:
184 enable_percpu_irq(xen_events_irq, 0);
185 return 0;
186}
187
188static int xen_dying_cpu(unsigned int cpu)
189{
190 disable_percpu_irq(xen_events_irq);
191 return 0;
192}
193
194void xen_reboot(int reason)
195{
196 struct sched_shutdown r = { .reason = reason };
197 int rc;
198
199 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
200 BUG_ON(rc);
201}
202
203static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
204{
205 xen_reboot(SHUTDOWN_reboot);
206}
207
208
209static void xen_power_off(void)
210{
211 xen_reboot(SHUTDOWN_poweroff);
212}
213
214static irqreturn_t xen_arm_callback(int irq, void *arg)
215{
216 xen_hvm_evtchn_do_upcall();
217 return IRQ_HANDLED;
218}
219
220static __initdata struct {
221 const char *compat;
222 const char *prefix;
223 const char *version;
224 bool found;
225} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
226
227static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
228 int depth, void *data)
229{
230 const void *s = NULL;
231 int len;
232
233 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
234 return 0;
235
236 if (of_flat_dt_is_compatible(node, hyper_node.compat))
237 hyper_node.found = true;
238
239 s = of_get_flat_dt_prop(node, "compatible", &len);
240 if (strlen(hyper_node.prefix) + 3 < len &&
241 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
242 hyper_node.version = s + strlen(hyper_node.prefix);
243
244 /*
245 * Check if Xen supports EFI by checking whether there is the
246 * "/hypervisor/uefi" node in DT. If so, runtime services are available
247 * through proxy functions (e.g. in case of Xen dom0 EFI implementation
248 * they call special hypercall which executes relevant EFI functions)
249 * and that is why they are always enabled.
250 */
251 if (IS_ENABLED(CONFIG_XEN_EFI)) {
252 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
253 !efi_runtime_disabled())
254 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
255 }
256
257 return 0;
258}
259
260/*
261 * see Documentation/devicetree/bindings/arm/xen.txt for the
262 * documentation of the Xen Device Tree format.
263 */
264#define GRANT_TABLE_PHYSADDR 0
265void __init xen_early_init(void)
266{
267 of_scan_flat_dt(fdt_find_hyper_node, NULL);
268 if (!hyper_node.found) {
269 pr_debug("No Xen support\n");
270 return;
271 }
272
273 if (hyper_node.version == NULL) {
274 pr_debug("Xen version not found\n");
275 return;
276 }
277
278 pr_info("Xen %s support found\n", hyper_node.version);
279
280 xen_domain_type = XEN_HVM_DOMAIN;
281
282 xen_setup_features();
283
284 if (xen_feature(XENFEAT_dom0))
285 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
286 else
287 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
288
289 if (!console_set_on_cmdline && !xen_initial_domain())
290 add_preferred_console("hvc", 0, NULL);
291}
292
293static void __init xen_acpi_guest_init(void)
294{
295#ifdef CONFIG_ACPI
296 struct xen_hvm_param a;
297 int interrupt, trigger, polarity;
298
299 a.domid = DOMID_SELF;
300 a.index = HVM_PARAM_CALLBACK_IRQ;
301
302 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
303 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
304 xen_events_irq = 0;
305 return;
306 }
307
308 interrupt = a.value & 0xff;
309 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
310 : ACPI_LEVEL_SENSITIVE;
311 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
312 : ACPI_ACTIVE_HIGH;
313 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
314#endif
315}
316
317static void __init xen_dt_guest_init(void)
318{
319 struct device_node *xen_node;
320
321 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
322 if (!xen_node) {
323 pr_err("Xen support was detected before, but it has disappeared\n");
324 return;
325 }
326
327 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
328}
329
330static int __init xen_guest_init(void)
331{
332 struct xen_add_to_physmap xatp;
333 struct shared_info *shared_info_page = NULL;
334 int cpu;
335
336 if (!xen_domain())
337 return 0;
338
339 if (!acpi_disabled)
340 xen_acpi_guest_init();
341 else
342 xen_dt_guest_init();
343
344 if (!xen_events_irq) {
345 pr_err("Xen event channel interrupt not found\n");
346 return -ENODEV;
347 }
348
349 /*
350 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
351 * parameters are found. Force enable runtime services.
352 */
353 if (efi_enabled(EFI_RUNTIME_SERVICES))
354 xen_efi_runtime_setup();
355
356 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
357
358 if (!shared_info_page) {
359 pr_err("not enough memory\n");
360 return -ENOMEM;
361 }
362 xatp.domid = DOMID_SELF;
363 xatp.idx = 0;
364 xatp.space = XENMAPSPACE_shared_info;
365 xatp.gpfn = virt_to_gfn(shared_info_page);
366 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
367 BUG();
368
369 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
370
371 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
372 * page, we use it in the event channel upcall and in some pvclock
373 * related functions.
374 * The shared info contains exactly 1 CPU (the boot CPU). The guest
375 * is required to use VCPUOP_register_vcpu_info to place vcpu info
376 * for secondary CPUs as they are brought up.
377 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
378 */
379 xen_vcpu_info = alloc_percpu(struct vcpu_info);
380 if (xen_vcpu_info == NULL)
381 return -ENOMEM;
382
383 /* Direct vCPU id mapping for ARM guests. */
384 for_each_possible_cpu(cpu)
385 per_cpu(xen_vcpu_id, cpu) = cpu;
386
387 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
388 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
389 &xen_auto_xlat_grant_frames.vaddr,
390 xen_auto_xlat_grant_frames.count)) {
391 free_percpu(xen_vcpu_info);
392 return -ENOMEM;
393 }
394 gnttab_init();
395 if (!xen_initial_domain())
396 xenbus_probe(NULL);
397
398 /*
399 * Making sure board specific code will not set up ops for
400 * cpu idle and cpu freq.
401 */
402 disable_cpuidle();
403 disable_cpufreq();
404
405 xen_init_IRQ();
406
407 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
408 "events", &xen_vcpu)) {
409 pr_err("Error request IRQ %d\n", xen_events_irq);
410 return -EINVAL;
411 }
412
413 xen_time_setup_guest();
414
415 if (xen_initial_domain())
416 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
417
418 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
419 "arm/xen:starting", xen_starting_cpu,
420 xen_dying_cpu);
421}
422early_initcall(xen_guest_init);
423
424static int __init xen_pm_init(void)
425{
426 if (!xen_domain())
427 return -ENODEV;
428
429 pm_power_off = xen_power_off;
430 arm_pm_restart = xen_restart;
431 if (!xen_initial_domain()) {
432 struct timespec64 ts;
433 xen_read_wallclock(&ts);
434 do_settimeofday64(&ts);
435 }
436
437 return 0;
438}
439late_initcall(xen_pm_init);
440
441
442/* empty stubs */
443void xen_arch_pre_suspend(void) { }
444void xen_arch_post_suspend(int suspend_cancelled) { }
445void xen_timer_resume(void) { }
446void xen_arch_resume(void) { }
447void xen_arch_suspend(void) { }
448
449
450/* In the hypercall.S file. */
451EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
452EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
453EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
454EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
455EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
456EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
457EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
458EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
459EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
460EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
461EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
462EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
463EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
464EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
465EXPORT_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
39struct 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 = virt_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 */
244#define GRANT_TABLE_PHYSADDR 0
245void __init xen_early_init(void)
246{
247 of_scan_flat_dt(fdt_find_hyper_node, NULL);
248 if (!hyper_node.found) {
249 pr_debug("No Xen support\n");
250 return;
251 }
252
253 if (hyper_node.version == NULL) {
254 pr_debug("Xen version not found\n");
255 return;
256 }
257
258 pr_info("Xen %s support found\n", hyper_node.version);
259
260 xen_domain_type = XEN_HVM_DOMAIN;
261
262 xen_setup_features();
263
264 if (xen_feature(XENFEAT_dom0))
265 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
266
267 if (!console_set_on_cmdline && !xen_initial_domain())
268 add_preferred_console("hvc", 0, NULL);
269}
270
271static void __init xen_acpi_guest_init(void)
272{
273#ifdef CONFIG_ACPI
274 struct xen_hvm_param a;
275 int interrupt, trigger, polarity;
276
277 a.domid = DOMID_SELF;
278 a.index = HVM_PARAM_CALLBACK_IRQ;
279
280 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
281 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
282 xen_events_irq = 0;
283 return;
284 }
285
286 interrupt = a.value & 0xff;
287 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
288 : ACPI_LEVEL_SENSITIVE;
289 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
290 : ACPI_ACTIVE_HIGH;
291 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
292#endif
293}
294
295static void __init xen_dt_guest_init(void)
296{
297 struct device_node *xen_node;
298
299 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
300 if (!xen_node) {
301 pr_err("Xen support was detected before, but it has disappeared\n");
302 return;
303 }
304
305 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
306}
307
308static int __init xen_guest_init(void)
309{
310 struct xen_add_to_physmap xatp;
311 struct shared_info *shared_info_page = NULL;
312 int cpu;
313
314 if (!xen_domain())
315 return 0;
316
317 if (!acpi_disabled)
318 xen_acpi_guest_init();
319 else
320 xen_dt_guest_init();
321
322 if (!xen_events_irq) {
323 pr_err("Xen event channel interrupt not found\n");
324 return -ENODEV;
325 }
326
327 /*
328 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
329 * parameters are found. Force enable runtime services.
330 */
331 if (efi_enabled(EFI_RUNTIME_SERVICES))
332 xen_efi_runtime_setup();
333
334 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
335
336 if (!shared_info_page) {
337 pr_err("not enough memory\n");
338 return -ENOMEM;
339 }
340 xatp.domid = DOMID_SELF;
341 xatp.idx = 0;
342 xatp.space = XENMAPSPACE_shared_info;
343 xatp.gpfn = virt_to_gfn(shared_info_page);
344 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
345 BUG();
346
347 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
348
349 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
350 * page, we use it in the event channel upcall and in some pvclock
351 * related functions.
352 * The shared info contains exactly 1 CPU (the boot CPU). The guest
353 * is required to use VCPUOP_register_vcpu_info to place vcpu info
354 * for secondary CPUs as they are brought up.
355 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
356 */
357 xen_vcpu_info = alloc_percpu(struct vcpu_info);
358 if (xen_vcpu_info == NULL)
359 return -ENOMEM;
360
361 /* Direct vCPU id mapping for ARM guests. */
362 for_each_possible_cpu(cpu)
363 per_cpu(xen_vcpu_id, cpu) = cpu;
364
365 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
366 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
367 &xen_auto_xlat_grant_frames.vaddr,
368 xen_auto_xlat_grant_frames.count)) {
369 free_percpu(xen_vcpu_info);
370 return -ENOMEM;
371 }
372 gnttab_init();
373 if (!xen_initial_domain())
374 xenbus_probe(NULL);
375
376 /*
377 * Making sure board specific code will not set up ops for
378 * cpu idle and cpu freq.
379 */
380 disable_cpuidle();
381 disable_cpufreq();
382
383 xen_init_IRQ();
384
385 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
386 "events", &xen_vcpu)) {
387 pr_err("Error request IRQ %d\n", xen_events_irq);
388 return -EINVAL;
389 }
390
391 xen_time_setup_guest();
392
393 if (xen_initial_domain())
394 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
395
396 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
397 "arm/xen:starting", xen_starting_cpu,
398 xen_dying_cpu);
399}
400early_initcall(xen_guest_init);
401
402static int __init xen_pm_init(void)
403{
404 if (!xen_domain())
405 return -ENODEV;
406
407 pm_power_off = xen_power_off;
408 arm_pm_restart = xen_restart;
409 if (!xen_initial_domain()) {
410 struct timespec64 ts;
411 xen_read_wallclock(&ts);
412 do_settimeofday64(&ts);
413 }
414
415 return 0;
416}
417late_initcall(xen_pm_init);
418
419
420/* empty stubs */
421void xen_arch_pre_suspend(void) { }
422void xen_arch_post_suspend(int suspend_cancelled) { }
423void xen_timer_resume(void) { }
424void xen_arch_resume(void) { }
425void xen_arch_suspend(void) { }
426
427
428/* In the hypercall.S file. */
429EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
430EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
431EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
432EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
433EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
434EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
435EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
436EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
437EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
438EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
439EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
440EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
441EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
442EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
443EXPORT_SYMBOL_GPL(privcmd_call);