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/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
53DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
54EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
55
56
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
80 do {
81 version = wall_clock->version;
82 rmb();
83 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
84 now.tv_nsec = wall_clock->nsec;
85 rmb();
86 } while ((wall_clock->version & 1) || (version != wall_clock->version));
87
88
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
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
109
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
123
124
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
144
145
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
226
227
228
229
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
242
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
328
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
349
350
351
352
353
354
355
356 xen_vcpu_info = alloc_percpu(struct vcpu_info);
357 if (xen_vcpu_info == NULL)
358 return -ENOMEM;
359
360
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
377
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
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
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);
443
