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
194static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
195{
196 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
197 int rc;
198 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
199 BUG_ON(rc);
200}
201
202static void xen_power_off(void)
203{
204 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
205 int rc;
206 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
207 BUG_ON(rc);
208}
209
210static irqreturn_t xen_arm_callback(int irq, void *arg)
211{
212 xen_hvm_evtchn_do_upcall();
213 return IRQ_HANDLED;
214}
215
216static __initdata struct {
217 const char *compat;
218 const char *prefix;
219 const char *version;
220 bool found;
221} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
222
223static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
224 int depth, void *data)
225{
226 const void *s = NULL;
227 int len;
228
229 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
230 return 0;
231
232 if (of_flat_dt_is_compatible(node, hyper_node.compat))
233 hyper_node.found = true;
234
235 s = of_get_flat_dt_prop(node, "compatible", &len);
236 if (strlen(hyper_node.prefix) + 3 < len &&
237 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
238 hyper_node.version = s + strlen(hyper_node.prefix);
239
240
241
242
243
244
245
246
247 if (IS_ENABLED(CONFIG_XEN_EFI)) {
248 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
249 !efi_runtime_disabled())
250 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
251 }
252
253 return 0;
254}
255
256
257
258
259
260#define GRANT_TABLE_PHYSADDR 0
261void __init xen_early_init(void)
262{
263 of_scan_flat_dt(fdt_find_hyper_node, NULL);
264 if (!hyper_node.found) {
265 pr_debug("No Xen support\n");
266 return;
267 }
268
269 if (hyper_node.version == NULL) {
270 pr_debug("Xen version not found\n");
271 return;
272 }
273
274 pr_info("Xen %s support found\n", hyper_node.version);
275
276 xen_domain_type = XEN_HVM_DOMAIN;
277
278 xen_setup_features();
279
280 if (xen_feature(XENFEAT_dom0))
281 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
282 else
283 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
284
285 if (!console_set_on_cmdline && !xen_initial_domain())
286 add_preferred_console("hvc", 0, NULL);
287}
288
289static void __init xen_acpi_guest_init(void)
290{
291#ifdef CONFIG_ACPI
292 struct xen_hvm_param a;
293 int interrupt, trigger, polarity;
294
295 a.domid = DOMID_SELF;
296 a.index = HVM_PARAM_CALLBACK_IRQ;
297
298 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
299 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
300 xen_events_irq = 0;
301 return;
302 }
303
304 interrupt = a.value & 0xff;
305 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
306 : ACPI_LEVEL_SENSITIVE;
307 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
308 : ACPI_ACTIVE_HIGH;
309 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
310#endif
311}
312
313static void __init xen_dt_guest_init(void)
314{
315 struct device_node *xen_node;
316
317 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
318 if (!xen_node) {
319 pr_err("Xen support was detected before, but it has disappeared\n");
320 return;
321 }
322
323 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
324}
325
326static int __init xen_guest_init(void)
327{
328 struct xen_add_to_physmap xatp;
329 struct shared_info *shared_info_page = NULL;
330 int cpu;
331
332 if (!xen_domain())
333 return 0;
334
335 if (!acpi_disabled)
336 xen_acpi_guest_init();
337 else
338 xen_dt_guest_init();
339
340 if (!xen_events_irq) {
341 pr_err("Xen event channel interrupt not found\n");
342 return -ENODEV;
343 }
344
345
346
347
348
349 if (efi_enabled(EFI_RUNTIME_SERVICES))
350 xen_efi_runtime_setup();
351
352 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
353
354 if (!shared_info_page) {
355 pr_err("not enough memory\n");
356 return -ENOMEM;
357 }
358 xatp.domid = DOMID_SELF;
359 xatp.idx = 0;
360 xatp.space = XENMAPSPACE_shared_info;
361 xatp.gpfn = virt_to_gfn(shared_info_page);
362 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
363 BUG();
364
365 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
366
367
368
369
370
371
372
373
374
375 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
376 sizeof(struct vcpu_info));
377 if (xen_vcpu_info == NULL)
378 return -ENOMEM;
379
380
381 for_each_possible_cpu(cpu)
382 per_cpu(xen_vcpu_id, cpu) = cpu;
383
384 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
385 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
386 &xen_auto_xlat_grant_frames.vaddr,
387 xen_auto_xlat_grant_frames.count)) {
388 free_percpu(xen_vcpu_info);
389 return -ENOMEM;
390 }
391 gnttab_init();
392 if (!xen_initial_domain())
393 xenbus_probe(NULL);
394
395
396
397
398
399 disable_cpuidle();
400 disable_cpufreq();
401
402 xen_init_IRQ();
403
404 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
405 "events", &xen_vcpu)) {
406 pr_err("Error request IRQ %d\n", xen_events_irq);
407 return -EINVAL;
408 }
409
410 xen_time_setup_guest();
411
412 if (xen_initial_domain())
413 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
414
415 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
416 "AP_ARM_XEN_STARTING", xen_starting_cpu,
417 xen_dying_cpu);
418}
419early_initcall(xen_guest_init);
420
421static int __init xen_pm_init(void)
422{
423 if (!xen_domain())
424 return -ENODEV;
425
426 pm_power_off = xen_power_off;
427 arm_pm_restart = xen_restart;
428 if (!xen_initial_domain()) {
429 struct timespec64 ts;
430 xen_read_wallclock(&ts);
431 do_settimeofday64(&ts);
432 }
433
434 return 0;
435}
436late_initcall(xen_pm_init);
437
438
439
440void xen_arch_pre_suspend(void) { }
441void xen_arch_post_suspend(int suspend_cancelled) { }
442void xen_timer_resume(void) { }
443void xen_arch_resume(void) { }
444void xen_arch_suspend(void) { }
445
446
447
448EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
449EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
450EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
451EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
452EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
453EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
454EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
455EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
456EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
457EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
458EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
459EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
460EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
461EXPORT_SYMBOL_GPL(privcmd_call);
462
