1
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/xen/xen-ops.h>
19#include <asm/system_misc.h>
20#include <asm/efi.h>
21#include <linux/interrupt.h>
22#include <linux/irqreturn.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_fdt.h>
26#include <linux/of_irq.h>
27#include <linux/of_address.h>
28#include <linux/cpuidle.h>
29#include <linux/cpufreq.h>
30#include <linux/cpu.h>
31#include <linux/console.h>
32#include <linux/pvclock_gtod.h>
33#include <linux/time64.h>
34#include <linux/timekeeping.h>
35#include <linux/timekeeper_internal.h>
36#include <linux/acpi.h>
37
38#include <linux/mm.h>
39
40struct start_info _xen_start_info;
41struct start_info *xen_start_info = &_xen_start_info;
42EXPORT_SYMBOL(xen_start_info);
43
44enum xen_domain_type xen_domain_type = XEN_NATIVE;
45EXPORT_SYMBOL(xen_domain_type);
46
47struct shared_info xen_dummy_shared_info;
48struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
49
50DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
51static struct vcpu_info __percpu *xen_vcpu_info;
52
53
54DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
55EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
56
57
58unsigned long xen_released_pages;
59struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
60
61static __read_mostly unsigned int xen_events_irq;
62
63uint32_t xen_start_flags;
64EXPORT_SYMBOL(xen_start_flags);
65
66int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
67 int nr, struct page **pages)
68{
69 return xen_xlate_unmap_gfn_range(vma, nr, pages);
70}
71EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
72
73static void xen_read_wallclock(struct timespec64 *ts)
74{
75 u32 version;
76 struct timespec64 now, ts_monotonic;
77 struct shared_info *s = HYPERVISOR_shared_info;
78 struct pvclock_wall_clock *wall_clock = &(s->wc);
79
80
81 do {
82 version = wall_clock->version;
83 rmb();
84 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
85 now.tv_nsec = wall_clock->nsec;
86 rmb();
87 } while ((wall_clock->version & 1) || (version != wall_clock->version));
88
89
90 ktime_get_ts64(&ts_monotonic);
91 *ts = timespec64_add(now, ts_monotonic);
92}
93
94static int xen_pvclock_gtod_notify(struct notifier_block *nb,
95 unsigned long was_set, void *priv)
96{
97
98 static struct timespec64 next_sync;
99
100 struct xen_platform_op op;
101 struct timespec64 now, system_time;
102 struct timekeeper *tk = priv;
103
104 now.tv_sec = tk->xtime_sec;
105 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
106 system_time = timespec64_add(now, tk->wall_to_monotonic);
107
108
109
110
111
112 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
113 return NOTIFY_OK;
114
115 op.cmd = XENPF_settime64;
116 op.u.settime64.mbz = 0;
117 op.u.settime64.secs = now.tv_sec;
118 op.u.settime64.nsecs = now.tv_nsec;
119 op.u.settime64.system_time = timespec64_to_ns(&system_time);
120 (void)HYPERVISOR_platform_op(&op);
121
122
123
124
125
126
127 next_sync = now;
128 next_sync.tv_sec += 11 * 60;
129
130 return NOTIFY_OK;
131}
132
133static struct notifier_block xen_pvclock_gtod_notifier = {
134 .notifier_call = xen_pvclock_gtod_notify,
135};
136
137static int xen_starting_cpu(unsigned int cpu)
138{
139 struct vcpu_register_vcpu_info info;
140 struct vcpu_info *vcpup;
141 int err;
142
143
144
145
146
147
148 if (per_cpu(xen_vcpu, cpu) != NULL)
149 goto after_register_vcpu_info;
150
151 pr_info("Xen: initializing cpu%d\n", cpu);
152 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
153
154 info.mfn = virt_to_gfn(vcpup);
155 info.offset = xen_offset_in_page(vcpup);
156
157 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
158 &info);
159 BUG_ON(err);
160 per_cpu(xen_vcpu, cpu) = vcpup;
161
162 xen_setup_runstate_info(cpu);
163
164after_register_vcpu_info:
165 enable_percpu_irq(xen_events_irq, 0);
166 return 0;
167}
168
169static int xen_dying_cpu(unsigned int cpu)
170{
171 disable_percpu_irq(xen_events_irq);
172 return 0;
173}
174
175void xen_reboot(int reason)
176{
177 struct sched_shutdown r = { .reason = reason };
178 int rc;
179
180 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
181 BUG_ON(rc);
182}
183
184static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
185{
186 xen_reboot(SHUTDOWN_reboot);
187}
188
189
190static void xen_power_off(void)
191{
192 xen_reboot(SHUTDOWN_poweroff);
193}
194
195static irqreturn_t xen_arm_callback(int irq, void *arg)
196{
197 xen_hvm_evtchn_do_upcall();
198 return IRQ_HANDLED;
199}
200
201static __initdata struct {
202 const char *compat;
203 const char *prefix;
204 const char *version;
205 bool found;
206} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
207
208static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
209 int depth, void *data)
210{
211 const void *s = NULL;
212 int len;
213
214 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
215 return 0;
216
217 if (of_flat_dt_is_compatible(node, hyper_node.compat))
218 hyper_node.found = true;
219
220 s = of_get_flat_dt_prop(node, "compatible", &len);
221 if (strlen(hyper_node.prefix) + 3 < len &&
222 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
223 hyper_node.version = s + strlen(hyper_node.prefix);
224
225
226
227
228
229
230
231
232 if (IS_ENABLED(CONFIG_XEN_EFI)) {
233 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
234 !efi_runtime_disabled())
235 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
236 }
237
238 return 0;
239}
240
241
242
243
244
245#define GRANT_TABLE_PHYSADDR 0
246void __init xen_early_init(void)
247{
248 of_scan_flat_dt(fdt_find_hyper_node, NULL);
249 if (!hyper_node.found) {
250 pr_debug("No Xen support\n");
251 return;
252 }
253
254 if (hyper_node.version == NULL) {
255 pr_debug("Xen version not found\n");
256 return;
257 }
258
259 pr_info("Xen %s support found\n", hyper_node.version);
260
261 xen_domain_type = XEN_HVM_DOMAIN;
262
263 xen_setup_features();
264
265 if (xen_feature(XENFEAT_dom0))
266 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
267
268 if (!console_set_on_cmdline && !xen_initial_domain())
269 add_preferred_console("hvc", 0, NULL);
270}
271
272static void __init xen_acpi_guest_init(void)
273{
274#ifdef CONFIG_ACPI
275 struct xen_hvm_param a;
276 int interrupt, trigger, polarity;
277
278 a.domid = DOMID_SELF;
279 a.index = HVM_PARAM_CALLBACK_IRQ;
280
281 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
282 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
283 xen_events_irq = 0;
284 return;
285 }
286
287 interrupt = a.value & 0xff;
288 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
289 : ACPI_LEVEL_SENSITIVE;
290 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
291 : ACPI_ACTIVE_HIGH;
292 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
293#endif
294}
295
296static void __init xen_dt_guest_init(void)
297{
298 struct device_node *xen_node;
299
300 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
301 if (!xen_node) {
302 pr_err("Xen support was detected before, but it has disappeared\n");
303 return;
304 }
305
306 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
307}
308
309static int __init xen_guest_init(void)
310{
311 struct xen_add_to_physmap xatp;
312 struct shared_info *shared_info_page = NULL;
313 int cpu;
314
315 if (!xen_domain())
316 return 0;
317
318 if (!acpi_disabled)
319 xen_acpi_guest_init();
320 else
321 xen_dt_guest_init();
322
323 if (!xen_events_irq) {
324 pr_err("Xen event channel interrupt not found\n");
325 return -ENODEV;
326 }
327
328
329
330
331
332 if (efi_enabled(EFI_RUNTIME_SERVICES))
333 xen_efi_runtime_setup();
334
335 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
336
337 if (!shared_info_page) {
338 pr_err("not enough memory\n");
339 return -ENOMEM;
340 }
341 xatp.domid = DOMID_SELF;
342 xatp.idx = 0;
343 xatp.space = XENMAPSPACE_shared_info;
344 xatp.gpfn = virt_to_gfn(shared_info_page);
345 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
346 BUG();
347
348 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
349
350
351
352
353
354
355
356
357
358 xen_vcpu_info = alloc_percpu(struct vcpu_info);
359 if (xen_vcpu_info == NULL)
360 return -ENOMEM;
361
362
363 for_each_possible_cpu(cpu)
364 per_cpu(xen_vcpu_id, cpu) = cpu;
365
366 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
367 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
368 &xen_auto_xlat_grant_frames.vaddr,
369 xen_auto_xlat_grant_frames.count)) {
370 free_percpu(xen_vcpu_info);
371 return -ENOMEM;
372 }
373 gnttab_init();
374 if (!xen_initial_domain())
375 xenbus_probe(NULL);
376
377
378
379
380
381 disable_cpuidle();
382 disable_cpufreq();
383
384 xen_init_IRQ();
385
386 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
387 "events", &xen_vcpu)) {
388 pr_err("Error request IRQ %d\n", xen_events_irq);
389 return -EINVAL;
390 }
391
392 xen_time_setup_guest();
393
394 if (xen_initial_domain())
395 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
396
397 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
398 "arm/xen:starting", xen_starting_cpu,
399 xen_dying_cpu);
400}
401early_initcall(xen_guest_init);
402
403static int __init xen_pm_init(void)
404{
405 if (!xen_domain())
406 return -ENODEV;
407
408 pm_power_off = xen_power_off;
409 arm_pm_restart = xen_restart;
410 if (!xen_initial_domain()) {
411 struct timespec64 ts;
412 xen_read_wallclock(&ts);
413 do_settimeofday64(&ts);
414 }
415
416 return 0;
417}
418late_initcall(xen_pm_init);
419
420
421
422void xen_arch_pre_suspend(void) { }
423void xen_arch_post_suspend(int suspend_cancelled) { }
424void xen_timer_resume(void) { }
425void xen_arch_resume(void) { }
426void xen_arch_suspend(void) { }
427
428
429
430EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
431EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
432EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
433EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
434EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
435EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
436EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
437EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
438EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
439EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
440EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
441EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
442EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
443EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
444EXPORT_SYMBOL_GPL(privcmd_call);
445
