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
62uint32_t xen_start_flags;
63EXPORT_SYMBOL(xen_start_flags);
64
65int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
66 unsigned long addr,
67 xen_pfn_t *gfn, int nr,
68 int *err_ptr, pgprot_t prot,
69 unsigned domid,
70 struct page **pages)
71{
72 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
73 prot, domid, pages);
74}
75EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
76
77
78int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
79 unsigned long addr,
80 xen_pfn_t gfn, int nr,
81 pgprot_t prot, unsigned domid,
82 struct page **pages)
83{
84 return -ENOSYS;
85}
86EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
87
88int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
89 int nr, struct page **pages)
90{
91 return xen_xlate_unmap_gfn_range(vma, nr, pages);
92}
93EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
94
95
96int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
97 unsigned long addr,
98 xen_pfn_t *mfn, int nr,
99 int *err_ptr, pgprot_t prot,
100 unsigned int domid, struct page **pages)
101{
102 return -ENOSYS;
103}
104EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
105
106static void xen_read_wallclock(struct timespec64 *ts)
107{
108 u32 version;
109 struct timespec64 now, ts_monotonic;
110 struct shared_info *s = HYPERVISOR_shared_info;
111 struct pvclock_wall_clock *wall_clock = &(s->wc);
112
113
114 do {
115 version = wall_clock->version;
116 rmb();
117 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
118 now.tv_nsec = wall_clock->nsec;
119 rmb();
120 } while ((wall_clock->version & 1) || (version != wall_clock->version));
121
122
123 ktime_get_ts64(&ts_monotonic);
124 *ts = timespec64_add(now, ts_monotonic);
125}
126
127static int xen_pvclock_gtod_notify(struct notifier_block *nb,
128 unsigned long was_set, void *priv)
129{
130
131 static struct timespec64 next_sync;
132
133 struct xen_platform_op op;
134 struct timespec64 now, system_time;
135 struct timekeeper *tk = priv;
136
137 now.tv_sec = tk->xtime_sec;
138 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
139 system_time = timespec64_add(now, tk->wall_to_monotonic);
140
141
142
143
144
145 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
146 return NOTIFY_OK;
147
148 op.cmd = XENPF_settime64;
149 op.u.settime64.mbz = 0;
150 op.u.settime64.secs = now.tv_sec;
151 op.u.settime64.nsecs = now.tv_nsec;
152 op.u.settime64.system_time = timespec64_to_ns(&system_time);
153 (void)HYPERVISOR_platform_op(&op);
154
155
156
157
158
159
160 next_sync = now;
161 next_sync.tv_sec += 11 * 60;
162
163 return NOTIFY_OK;
164}
165
166static struct notifier_block xen_pvclock_gtod_notifier = {
167 .notifier_call = xen_pvclock_gtod_notify,
168};
169
170static int xen_starting_cpu(unsigned int cpu)
171{
172 struct vcpu_register_vcpu_info info;
173 struct vcpu_info *vcpup;
174 int err;
175
176
177
178
179
180
181 if (per_cpu(xen_vcpu, cpu) != NULL)
182 goto after_register_vcpu_info;
183
184 pr_info("Xen: initializing cpu%d\n", cpu);
185 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
186
187 info.mfn = virt_to_gfn(vcpup);
188 info.offset = xen_offset_in_page(vcpup);
189
190 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
191 &info);
192 BUG_ON(err);
193 per_cpu(xen_vcpu, cpu) = vcpup;
194
195 xen_setup_runstate_info(cpu);
196
197after_register_vcpu_info:
198 enable_percpu_irq(xen_events_irq, 0);
199 return 0;
200}
201
202static int xen_dying_cpu(unsigned int cpu)
203{
204 disable_percpu_irq(xen_events_irq);
205 return 0;
206}
207
208void xen_reboot(int reason)
209{
210 struct sched_shutdown r = { .reason = reason };
211 int rc;
212
213 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
214 BUG_ON(rc);
215}
216
217static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
218{
219 xen_reboot(SHUTDOWN_reboot);
220}
221
222
223static void xen_power_off(void)
224{
225 xen_reboot(SHUTDOWN_poweroff);
226}
227
228static irqreturn_t xen_arm_callback(int irq, void *arg)
229{
230 xen_hvm_evtchn_do_upcall();
231 return IRQ_HANDLED;
232}
233
234static __initdata struct {
235 const char *compat;
236 const char *prefix;
237 const char *version;
238 bool found;
239} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
240
241static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
242 int depth, void *data)
243{
244 const void *s = NULL;
245 int len;
246
247 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
248 return 0;
249
250 if (of_flat_dt_is_compatible(node, hyper_node.compat))
251 hyper_node.found = true;
252
253 s = of_get_flat_dt_prop(node, "compatible", &len);
254 if (strlen(hyper_node.prefix) + 3 < len &&
255 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
256 hyper_node.version = s + strlen(hyper_node.prefix);
257
258
259
260
261
262
263
264
265 if (IS_ENABLED(CONFIG_XEN_EFI)) {
266 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
267 !efi_runtime_disabled())
268 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
269 }
270
271 return 0;
272}
273
274
275
276
277
278#define GRANT_TABLE_PHYSADDR 0
279void __init xen_early_init(void)
280{
281 of_scan_flat_dt(fdt_find_hyper_node, NULL);
282 if (!hyper_node.found) {
283 pr_debug("No Xen support\n");
284 return;
285 }
286
287 if (hyper_node.version == NULL) {
288 pr_debug("Xen version not found\n");
289 return;
290 }
291
292 pr_info("Xen %s support found\n", hyper_node.version);
293
294 xen_domain_type = XEN_HVM_DOMAIN;
295
296 xen_setup_features();
297
298 if (xen_feature(XENFEAT_dom0))
299 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
300
301 if (!console_set_on_cmdline && !xen_initial_domain())
302 add_preferred_console("hvc", 0, NULL);
303}
304
305static void __init xen_acpi_guest_init(void)
306{
307#ifdef CONFIG_ACPI
308 struct xen_hvm_param a;
309 int interrupt, trigger, polarity;
310
311 a.domid = DOMID_SELF;
312 a.index = HVM_PARAM_CALLBACK_IRQ;
313
314 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
315 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
316 xen_events_irq = 0;
317 return;
318 }
319
320 interrupt = a.value & 0xff;
321 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
322 : ACPI_LEVEL_SENSITIVE;
323 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
324 : ACPI_ACTIVE_HIGH;
325 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
326#endif
327}
328
329static void __init xen_dt_guest_init(void)
330{
331 struct device_node *xen_node;
332
333 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
334 if (!xen_node) {
335 pr_err("Xen support was detected before, but it has disappeared\n");
336 return;
337 }
338
339 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
340}
341
342static int __init xen_guest_init(void)
343{
344 struct xen_add_to_physmap xatp;
345 struct shared_info *shared_info_page = NULL;
346 int cpu;
347
348 if (!xen_domain())
349 return 0;
350
351 if (!acpi_disabled)
352 xen_acpi_guest_init();
353 else
354 xen_dt_guest_init();
355
356 if (!xen_events_irq) {
357 pr_err("Xen event channel interrupt not found\n");
358 return -ENODEV;
359 }
360
361
362
363
364
365 if (efi_enabled(EFI_RUNTIME_SERVICES))
366 xen_efi_runtime_setup();
367
368 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
369
370 if (!shared_info_page) {
371 pr_err("not enough memory\n");
372 return -ENOMEM;
373 }
374 xatp.domid = DOMID_SELF;
375 xatp.idx = 0;
376 xatp.space = XENMAPSPACE_shared_info;
377 xatp.gpfn = virt_to_gfn(shared_info_page);
378 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
379 BUG();
380
381 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
382
383
384
385
386
387
388
389
390
391 xen_vcpu_info = alloc_percpu(struct vcpu_info);
392 if (xen_vcpu_info == NULL)
393 return -ENOMEM;
394
395
396 for_each_possible_cpu(cpu)
397 per_cpu(xen_vcpu_id, cpu) = cpu;
398
399 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
400 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
401 &xen_auto_xlat_grant_frames.vaddr,
402 xen_auto_xlat_grant_frames.count)) {
403 free_percpu(xen_vcpu_info);
404 return -ENOMEM;
405 }
406 gnttab_init();
407 if (!xen_initial_domain())
408 xenbus_probe(NULL);
409
410
411
412
413
414 disable_cpuidle();
415 disable_cpufreq();
416
417 xen_init_IRQ();
418
419 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
420 "events", &xen_vcpu)) {
421 pr_err("Error request IRQ %d\n", xen_events_irq);
422 return -EINVAL;
423 }
424
425 xen_time_setup_guest();
426
427 if (xen_initial_domain())
428 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
429
430 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
431 "arm/xen:starting", xen_starting_cpu,
432 xen_dying_cpu);
433}
434early_initcall(xen_guest_init);
435
436static int __init xen_pm_init(void)
437{
438 if (!xen_domain())
439 return -ENODEV;
440
441 pm_power_off = xen_power_off;
442 arm_pm_restart = xen_restart;
443 if (!xen_initial_domain()) {
444 struct timespec64 ts;
445 xen_read_wallclock(&ts);
446 do_settimeofday64(&ts);
447 }
448
449 return 0;
450}
451late_initcall(xen_pm_init);
452
453
454
455void xen_arch_pre_suspend(void) { }
456void xen_arch_post_suspend(int suspend_cancelled) { }
457void xen_timer_resume(void) { }
458void xen_arch_resume(void) { }
459void xen_arch_suspend(void) { }
460
461
462
463EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
464EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
465EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
466EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
467EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
468EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
469EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
470EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
471EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
472EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
473EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
474EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
475EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
476EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
477EXPORT_SYMBOL_GPL(privcmd_call);
478
