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/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/reboot.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
40static struct 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 = percpu_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 if (!xen_kernel_unmapped_at_usr())
163 xen_setup_runstate_info(cpu);
164
165after_register_vcpu_info:
166 enable_percpu_irq(xen_events_irq, 0);
167 return 0;
168}
169
170static int xen_dying_cpu(unsigned int cpu)
171{
172 disable_percpu_irq(xen_events_irq);
173 return 0;
174}
175
176void xen_reboot(int reason)
177{
178 struct sched_shutdown r = { .reason = reason };
179 int rc;
180
181 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
182 BUG_ON(rc);
183}
184
185static int xen_restart(struct notifier_block *nb, unsigned long action,
186 void *data)
187{
188 xen_reboot(SHUTDOWN_reboot);
189
190 return NOTIFY_DONE;
191}
192
193static struct notifier_block xen_restart_nb = {
194 .notifier_call = xen_restart,
195 .priority = 192,
196};
197
198static void xen_power_off(void)
199{
200 xen_reboot(SHUTDOWN_poweroff);
201}
202
203static irqreturn_t xen_arm_callback(int irq, void *arg)
204{
205 xen_hvm_evtchn_do_upcall();
206 return IRQ_HANDLED;
207}
208
209static __initdata struct {
210 const char *compat;
211 const char *prefix;
212 const char *version;
213 bool found;
214} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
215
216static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
217 int depth, void *data)
218{
219 const void *s = NULL;
220 int len;
221
222 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
223 return 0;
224
225 if (of_flat_dt_is_compatible(node, hyper_node.compat))
226 hyper_node.found = true;
227
228 s = of_get_flat_dt_prop(node, "compatible", &len);
229 if (strlen(hyper_node.prefix) + 3 < len &&
230 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
231 hyper_node.version = s + strlen(hyper_node.prefix);
232
233
234
235
236
237
238
239
240 if (IS_ENABLED(CONFIG_XEN_EFI)) {
241 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
242 !efi_runtime_disabled())
243 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
244 }
245
246 return 0;
247}
248
249
250
251
252
253void __init xen_early_init(void)
254{
255 of_scan_flat_dt(fdt_find_hyper_node, NULL);
256 if (!hyper_node.found) {
257 pr_debug("No Xen support\n");
258 return;
259 }
260
261 if (hyper_node.version == NULL) {
262 pr_debug("Xen version not found\n");
263 return;
264 }
265
266 pr_info("Xen %s support found\n", hyper_node.version);
267
268 xen_domain_type = XEN_HVM_DOMAIN;
269
270 xen_setup_features();
271
272 if (xen_feature(XENFEAT_dom0))
273 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
274
275 if (!console_set_on_cmdline && !xen_initial_domain())
276 add_preferred_console("hvc", 0, NULL);
277}
278
279static void __init xen_acpi_guest_init(void)
280{
281#ifdef CONFIG_ACPI
282 struct xen_hvm_param a;
283 int interrupt, trigger, polarity;
284
285 a.domid = DOMID_SELF;
286 a.index = HVM_PARAM_CALLBACK_IRQ;
287
288 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
289 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
290 xen_events_irq = 0;
291 return;
292 }
293
294 interrupt = a.value & 0xff;
295 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
296 : ACPI_LEVEL_SENSITIVE;
297 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
298 : ACPI_ACTIVE_HIGH;
299 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
300#endif
301}
302
303static void __init xen_dt_guest_init(void)
304{
305 struct device_node *xen_node;
306
307 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
308 if (!xen_node) {
309 pr_err("Xen support was detected before, but it has disappeared\n");
310 return;
311 }
312
313 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
314}
315
316static int __init xen_guest_init(void)
317{
318 struct xen_add_to_physmap xatp;
319 struct shared_info *shared_info_page = NULL;
320 int cpu;
321
322 if (!xen_domain())
323 return 0;
324
325 if (!acpi_disabled)
326 xen_acpi_guest_init();
327 else
328 xen_dt_guest_init();
329
330 if (!xen_events_irq) {
331 pr_err("Xen event channel interrupt not found\n");
332 return -ENODEV;
333 }
334
335
336
337
338
339 if (efi_enabled(EFI_RUNTIME_SERVICES))
340 xen_efi_runtime_setup();
341
342 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
343
344 if (!shared_info_page) {
345 pr_err("not enough memory\n");
346 return -ENOMEM;
347 }
348 xatp.domid = DOMID_SELF;
349 xatp.idx = 0;
350 xatp.space = XENMAPSPACE_shared_info;
351 xatp.gpfn = virt_to_gfn(shared_info_page);
352 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
353 BUG();
354
355 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
356
357
358
359
360
361
362
363
364
365 xen_vcpu_info = alloc_percpu(struct vcpu_info);
366 if (xen_vcpu_info == NULL)
367 return -ENOMEM;
368
369
370 for_each_possible_cpu(cpu)
371 per_cpu(xen_vcpu_id, cpu) = cpu;
372
373 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
374 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
375 &xen_auto_xlat_grant_frames.vaddr,
376 xen_auto_xlat_grant_frames.count)) {
377 free_percpu(xen_vcpu_info);
378 return -ENOMEM;
379 }
380 gnttab_init();
381
382
383
384
385
386 disable_cpuidle();
387 disable_cpufreq();
388
389 xen_init_IRQ();
390
391 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
392 "events", &xen_vcpu)) {
393 pr_err("Error request IRQ %d\n", xen_events_irq);
394 return -EINVAL;
395 }
396
397 if (!xen_kernel_unmapped_at_usr())
398 xen_time_setup_guest();
399
400 if (xen_initial_domain())
401 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
402
403 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
404 "arm/xen:starting", xen_starting_cpu,
405 xen_dying_cpu);
406}
407early_initcall(xen_guest_init);
408
409static int __init xen_pm_init(void)
410{
411 if (!xen_domain())
412 return -ENODEV;
413
414 pm_power_off = xen_power_off;
415 register_restart_handler(&xen_restart_nb);
416 if (!xen_initial_domain()) {
417 struct timespec64 ts;
418 xen_read_wallclock(&ts);
419 do_settimeofday64(&ts);
420 }
421
422 return 0;
423}
424late_initcall(xen_pm_init);
425
426
427
428void xen_arch_pre_suspend(void) { }
429void xen_arch_post_suspend(int suspend_cancelled) { }
430void xen_timer_resume(void) { }
431void xen_arch_resume(void) { }
432void xen_arch_suspend(void) { }
433
434
435
436EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
437EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
438EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
439EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
440EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
441EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
442EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
443EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
444EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
445EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
446EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
447EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
448EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
449EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
450EXPORT_SYMBOL_GPL(privcmd_call);
451
