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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/* Linux <-> Xen vCPU id mapping */
53DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
54EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
55
56/* These are unused until we support booting "pre-ballooned" */
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/* Not used by XENFEAT_auto_translated guests. */
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 /* get wallclock at system boot */
100 do {
101 version = wall_clock->version;
102 rmb(); /* fetch version before time */
103 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
104 now.tv_nsec = wall_clock->nsec;
105 rmb(); /* fetch time before checking version */
106 } while ((wall_clock->version & 1) || (version != wall_clock->version));
107
108 /* time since system boot */
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 /* Protected by the calling core code serialization */
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 * We only take the expensive HV call when the clock was set
129 * or when the 11 minutes RTC synchronization time elapsed.
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 * Move the next drift compensation time 11 minutes
143 * ahead. That's emulating the sync_cmos_clock() update for
144 * the hardware RTC.
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 * VCPUOP_register_vcpu_info cannot be called twice for the same
164 * vcpu, so if vcpu_info is already registered, just get out. This
165 * can happen with cpu-hotplug.
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 * Check if Xen supports EFI by checking whether there is the
246 * "/hypervisor/uefi" node in DT. If so, runtime services are available
247 * through proxy functions (e.g. in case of Xen dom0 EFI implementation
248 * they call special hypercall which executes relevant EFI functions)
249 * and that is why they are always enabled.
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 * see Documentation/devicetree/bindings/arm/xen.txt for the
262 * documentation of the Xen Device Tree format.
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 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
351 * parameters are found. Force enable runtime services.
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 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
372 * page, we use it in the event channel upcall and in some pvclock
373 * related functions.
374 * The shared info contains exactly 1 CPU (the boot CPU). The guest
375 * is required to use VCPUOP_register_vcpu_info to place vcpu info
376 * for secondary CPUs as they are brought up.
377 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
378 */
379 xen_vcpu_info = alloc_percpu(struct vcpu_info);
380 if (xen_vcpu_info == NULL)
381 return -ENOMEM;
382
383 /* Direct vCPU id mapping for ARM guests. */
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 * Making sure board specific code will not set up ops for
400 * cpu idle and cpu freq.
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/* empty stubs */
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/* In the hypercall.S file. */
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);
1// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/virtio_anchor.h>
38
39#include <linux/mm.h>
40
41static struct start_info _xen_start_info;
42struct start_info *xen_start_info = &_xen_start_info;
43EXPORT_SYMBOL(xen_start_info);
44
45enum xen_domain_type xen_domain_type = XEN_NATIVE;
46EXPORT_SYMBOL(xen_domain_type);
47
48struct shared_info xen_dummy_shared_info;
49struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
50
51DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
52static struct vcpu_info __percpu *xen_vcpu_info;
53
54/* Linux <-> Xen vCPU id mapping */
55DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
56EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
57
58/* These are unused until we support booting "pre-ballooned" */
59unsigned long xen_released_pages;
60struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
61
62static __read_mostly unsigned int xen_events_irq;
63static __read_mostly phys_addr_t xen_grant_frames;
64
65#define GRANT_TABLE_INDEX 0
66#define EXT_REGION_INDEX 1
67
68uint32_t xen_start_flags;
69EXPORT_SYMBOL(xen_start_flags);
70
71int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
72 int nr, struct page **pages)
73{
74 return xen_xlate_unmap_gfn_range(vma, nr, pages);
75}
76EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
77
78static void xen_read_wallclock(struct timespec64 *ts)
79{
80 u32 version;
81 struct timespec64 now, ts_monotonic;
82 struct shared_info *s = HYPERVISOR_shared_info;
83 struct pvclock_wall_clock *wall_clock = &(s->wc);
84
85 /* get wallclock at system boot */
86 do {
87 version = wall_clock->version;
88 rmb(); /* fetch version before time */
89 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
90 now.tv_nsec = wall_clock->nsec;
91 rmb(); /* fetch time before checking version */
92 } while ((wall_clock->version & 1) || (version != wall_clock->version));
93
94 /* time since system boot */
95 ktime_get_ts64(&ts_monotonic);
96 *ts = timespec64_add(now, ts_monotonic);
97}
98
99static int xen_pvclock_gtod_notify(struct notifier_block *nb,
100 unsigned long was_set, void *priv)
101{
102 /* Protected by the calling core code serialization */
103 static struct timespec64 next_sync;
104
105 struct xen_platform_op op;
106 struct timespec64 now, system_time;
107 struct timekeeper *tk = priv;
108
109 now.tv_sec = tk->xtime_sec;
110 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
111 system_time = timespec64_add(now, tk->wall_to_monotonic);
112
113 /*
114 * We only take the expensive HV call when the clock was set
115 * or when the 11 minutes RTC synchronization time elapsed.
116 */
117 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
118 return NOTIFY_OK;
119
120 op.cmd = XENPF_settime64;
121 op.u.settime64.mbz = 0;
122 op.u.settime64.secs = now.tv_sec;
123 op.u.settime64.nsecs = now.tv_nsec;
124 op.u.settime64.system_time = timespec64_to_ns(&system_time);
125 (void)HYPERVISOR_platform_op(&op);
126
127 /*
128 * Move the next drift compensation time 11 minutes
129 * ahead. That's emulating the sync_cmos_clock() update for
130 * the hardware RTC.
131 */
132 next_sync = now;
133 next_sync.tv_sec += 11 * 60;
134
135 return NOTIFY_OK;
136}
137
138static struct notifier_block xen_pvclock_gtod_notifier = {
139 .notifier_call = xen_pvclock_gtod_notify,
140};
141
142static int xen_starting_cpu(unsigned int cpu)
143{
144 struct vcpu_register_vcpu_info info;
145 struct vcpu_info *vcpup;
146 int err;
147
148 /*
149 * VCPUOP_register_vcpu_info cannot be called twice for the same
150 * vcpu, so if vcpu_info is already registered, just get out. This
151 * can happen with cpu-hotplug.
152 */
153 if (per_cpu(xen_vcpu, cpu) != NULL)
154 goto after_register_vcpu_info;
155
156 pr_info("Xen: initializing cpu%d\n", cpu);
157 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
158
159 info.mfn = percpu_to_gfn(vcpup);
160 info.offset = xen_offset_in_page(vcpup);
161
162 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
163 &info);
164 BUG_ON(err);
165 per_cpu(xen_vcpu, cpu) = vcpup;
166
167 if (!xen_kernel_unmapped_at_usr())
168 xen_setup_runstate_info(cpu);
169
170after_register_vcpu_info:
171 enable_percpu_irq(xen_events_irq, 0);
172 return 0;
173}
174
175static int xen_dying_cpu(unsigned int cpu)
176{
177 disable_percpu_irq(xen_events_irq);
178 return 0;
179}
180
181void xen_reboot(int reason)
182{
183 struct sched_shutdown r = { .reason = reason };
184 int rc;
185
186 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
187 BUG_ON(rc);
188}
189
190static int xen_restart(struct notifier_block *nb, unsigned long action,
191 void *data)
192{
193 xen_reboot(SHUTDOWN_reboot);
194
195 return NOTIFY_DONE;
196}
197
198static struct notifier_block xen_restart_nb = {
199 .notifier_call = xen_restart,
200 .priority = 192,
201};
202
203static void xen_power_off(void)
204{
205 xen_reboot(SHUTDOWN_poweroff);
206}
207
208static irqreturn_t xen_arm_callback(int irq, void *arg)
209{
210 xen_hvm_evtchn_do_upcall();
211 return IRQ_HANDLED;
212}
213
214static __initdata struct {
215 const char *compat;
216 const char *prefix;
217 const char *version;
218 bool found;
219} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
220
221static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
222 int depth, void *data)
223{
224 const void *s = NULL;
225 int len;
226
227 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
228 return 0;
229
230 if (of_flat_dt_is_compatible(node, hyper_node.compat))
231 hyper_node.found = true;
232
233 s = of_get_flat_dt_prop(node, "compatible", &len);
234 if (strlen(hyper_node.prefix) + 3 < len &&
235 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
236 hyper_node.version = s + strlen(hyper_node.prefix);
237
238 /*
239 * Check if Xen supports EFI by checking whether there is the
240 * "/hypervisor/uefi" node in DT. If so, runtime services are available
241 * through proxy functions (e.g. in case of Xen dom0 EFI implementation
242 * they call special hypercall which executes relevant EFI functions)
243 * and that is why they are always enabled.
244 */
245 if (IS_ENABLED(CONFIG_XEN_EFI)) {
246 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
247 !efi_runtime_disabled())
248 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
249 }
250
251 return 0;
252}
253
254/*
255 * see Documentation/devicetree/bindings/arm/xen.txt for the
256 * documentation of the Xen Device Tree format.
257 */
258void __init xen_early_init(void)
259{
260 of_scan_flat_dt(fdt_find_hyper_node, NULL);
261 if (!hyper_node.found) {
262 pr_debug("No Xen support\n");
263 return;
264 }
265
266 if (hyper_node.version == NULL) {
267 pr_debug("Xen version not found\n");
268 return;
269 }
270
271 pr_info("Xen %s support found\n", hyper_node.version);
272
273 xen_domain_type = XEN_HVM_DOMAIN;
274
275 xen_setup_features();
276
277 if (xen_feature(XENFEAT_dom0))
278 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
279
280 if (!console_set_on_cmdline && !xen_initial_domain())
281 add_preferred_console("hvc", 0, NULL);
282}
283
284static void __init xen_acpi_guest_init(void)
285{
286#ifdef CONFIG_ACPI
287 struct xen_hvm_param a;
288 int interrupt, trigger, polarity;
289
290 a.domid = DOMID_SELF;
291 a.index = HVM_PARAM_CALLBACK_IRQ;
292
293 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
294 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
295 xen_events_irq = 0;
296 return;
297 }
298
299 interrupt = a.value & 0xff;
300 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
301 : ACPI_LEVEL_SENSITIVE;
302 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
303 : ACPI_ACTIVE_HIGH;
304 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
305#endif
306}
307
308#ifdef CONFIG_XEN_UNPOPULATED_ALLOC
309/*
310 * A type-less specific Xen resource which contains extended regions
311 * (unused regions of guest physical address space provided by the hypervisor).
312 */
313static struct resource xen_resource = {
314 .name = "Xen unused space",
315};
316
317int __init arch_xen_unpopulated_init(struct resource **res)
318{
319 struct device_node *np;
320 struct resource *regs, *tmp_res;
321 uint64_t min_gpaddr = -1, max_gpaddr = 0;
322 unsigned int i, nr_reg = 0;
323 int rc;
324
325 if (!xen_domain())
326 return -ENODEV;
327
328 if (!acpi_disabled)
329 return -ENODEV;
330
331 np = of_find_compatible_node(NULL, NULL, "xen,xen");
332 if (WARN_ON(!np))
333 return -ENODEV;
334
335 /* Skip region 0 which is reserved for grant table space */
336 while (of_get_address(np, nr_reg + EXT_REGION_INDEX, NULL, NULL))
337 nr_reg++;
338
339 if (!nr_reg) {
340 pr_err("No extended regions are found\n");
341 of_node_put(np);
342 return -EINVAL;
343 }
344
345 regs = kcalloc(nr_reg, sizeof(*regs), GFP_KERNEL);
346 if (!regs) {
347 of_node_put(np);
348 return -ENOMEM;
349 }
350
351 /*
352 * Create resource from extended regions provided by the hypervisor to be
353 * used as unused address space for Xen scratch pages.
354 */
355 for (i = 0; i < nr_reg; i++) {
356 rc = of_address_to_resource(np, i + EXT_REGION_INDEX, ®s[i]);
357 if (rc)
358 goto err;
359
360 if (max_gpaddr < regs[i].end)
361 max_gpaddr = regs[i].end;
362 if (min_gpaddr > regs[i].start)
363 min_gpaddr = regs[i].start;
364 }
365
366 xen_resource.start = min_gpaddr;
367 xen_resource.end = max_gpaddr;
368
369 /*
370 * Mark holes between extended regions as unavailable. The rest of that
371 * address space will be available for the allocation.
372 */
373 for (i = 1; i < nr_reg; i++) {
374 resource_size_t start, end;
375
376 /* There is an overlap between regions */
377 if (regs[i - 1].end + 1 > regs[i].start) {
378 rc = -EINVAL;
379 goto err;
380 }
381
382 /* There is no hole between regions */
383 if (regs[i - 1].end + 1 == regs[i].start)
384 continue;
385
386 start = regs[i - 1].end + 1;
387 end = regs[i].start - 1;
388
389 tmp_res = kzalloc(sizeof(*tmp_res), GFP_KERNEL);
390 if (!tmp_res) {
391 rc = -ENOMEM;
392 goto err;
393 }
394
395 tmp_res->name = "Unavailable space";
396 tmp_res->start = start;
397 tmp_res->end = end;
398
399 rc = insert_resource(&xen_resource, tmp_res);
400 if (rc) {
401 pr_err("Cannot insert resource %pR (%d)\n", tmp_res, rc);
402 kfree(tmp_res);
403 goto err;
404 }
405 }
406
407 *res = &xen_resource;
408
409err:
410 of_node_put(np);
411 kfree(regs);
412 return rc;
413}
414#endif
415
416static void __init xen_dt_guest_init(void)
417{
418 struct device_node *xen_node;
419 struct resource res;
420
421 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
422 if (!xen_node) {
423 pr_err("Xen support was detected before, but it has disappeared\n");
424 return;
425 }
426
427 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
428
429 if (of_address_to_resource(xen_node, GRANT_TABLE_INDEX, &res)) {
430 pr_err("Xen grant table region is not found\n");
431 of_node_put(xen_node);
432 return;
433 }
434 of_node_put(xen_node);
435 xen_grant_frames = res.start;
436}
437
438static int __init xen_guest_init(void)
439{
440 struct xen_add_to_physmap xatp;
441 struct shared_info *shared_info_page = NULL;
442 int rc, cpu;
443
444 if (!xen_domain())
445 return 0;
446
447 if (IS_ENABLED(CONFIG_XEN_VIRTIO))
448 virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc);
449
450 if (!acpi_disabled)
451 xen_acpi_guest_init();
452 else
453 xen_dt_guest_init();
454
455 if (!xen_events_irq) {
456 pr_err("Xen event channel interrupt not found\n");
457 return -ENODEV;
458 }
459
460 /*
461 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
462 * parameters are found. Force enable runtime services.
463 */
464 if (efi_enabled(EFI_RUNTIME_SERVICES))
465 xen_efi_runtime_setup();
466
467 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
468
469 if (!shared_info_page) {
470 pr_err("not enough memory\n");
471 return -ENOMEM;
472 }
473 xatp.domid = DOMID_SELF;
474 xatp.idx = 0;
475 xatp.space = XENMAPSPACE_shared_info;
476 xatp.gpfn = virt_to_gfn(shared_info_page);
477 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
478 BUG();
479
480 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
481
482 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
483 * page, we use it in the event channel upcall and in some pvclock
484 * related functions.
485 * The shared info contains exactly 1 CPU (the boot CPU). The guest
486 * is required to use VCPUOP_register_vcpu_info to place vcpu info
487 * for secondary CPUs as they are brought up.
488 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
489 */
490 xen_vcpu_info = alloc_percpu(struct vcpu_info);
491 if (xen_vcpu_info == NULL)
492 return -ENOMEM;
493
494 /* Direct vCPU id mapping for ARM guests. */
495 for_each_possible_cpu(cpu)
496 per_cpu(xen_vcpu_id, cpu) = cpu;
497
498 if (!xen_grant_frames) {
499 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
500 rc = xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
501 &xen_auto_xlat_grant_frames.vaddr,
502 xen_auto_xlat_grant_frames.count);
503 } else
504 rc = gnttab_setup_auto_xlat_frames(xen_grant_frames);
505 if (rc) {
506 free_percpu(xen_vcpu_info);
507 return rc;
508 }
509 gnttab_init();
510
511 /*
512 * Making sure board specific code will not set up ops for
513 * cpu idle and cpu freq.
514 */
515 disable_cpuidle();
516 disable_cpufreq();
517
518 xen_init_IRQ();
519
520 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
521 "events", &xen_vcpu)) {
522 pr_err("Error request IRQ %d\n", xen_events_irq);
523 return -EINVAL;
524 }
525
526 if (!xen_kernel_unmapped_at_usr())
527 xen_time_setup_guest();
528
529 if (xen_initial_domain())
530 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
531
532 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
533 "arm/xen:starting", xen_starting_cpu,
534 xen_dying_cpu);
535}
536early_initcall(xen_guest_init);
537
538static int __init xen_pm_init(void)
539{
540 if (!xen_domain())
541 return -ENODEV;
542
543 pm_power_off = xen_power_off;
544 register_restart_handler(&xen_restart_nb);
545 if (!xen_initial_domain()) {
546 struct timespec64 ts;
547 xen_read_wallclock(&ts);
548 do_settimeofday64(&ts);
549 }
550
551 return 0;
552}
553late_initcall(xen_pm_init);
554
555
556/* empty stubs */
557void xen_arch_pre_suspend(void) { }
558void xen_arch_post_suspend(int suspend_cancelled) { }
559void xen_timer_resume(void) { }
560void xen_arch_resume(void) { }
561void xen_arch_suspend(void) { }
562
563
564/* In the hypercall.S file. */
565EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
566EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
567EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
568EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
569EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
570EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
571EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
572EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
573EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
574EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
575EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
576EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
577EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
578EXPORT_SYMBOL_GPL(privcmd_call);