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
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
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
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
100 do {
101 version = wall_clock->version;
102 rmb();
103 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
104 now.tv_nsec = wall_clock->nsec;
105 rmb();
106 } while ((wall_clock->version & 1) || (version != wall_clock->version));
107
108
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
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
129
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
143
144
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
164
165
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
246
247
248
249
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
262
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
351
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
372
373
374
375
376
377
378
379 xen_vcpu_info = alloc_percpu(struct vcpu_info);
380 if (xen_vcpu_info == NULL)
381 return -ENOMEM;
382
383
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
400
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
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
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);
466
