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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/paravirt.h>
16#include <asm/xen/hypervisor.h>
17#include <asm/xen/hypercall.h>
18#include <asm/system_misc.h>
19#include <linux/interrupt.h>
20#include <linux/irqreturn.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/of_irq.h>
24#include <linux/of_address.h>
25#include <linux/cpuidle.h>
26#include <linux/cpufreq.h>
27#include <linux/cpu.h>
28#include <linux/console.h>
29#include <linux/pvclock_gtod.h>
30#include <linux/time64.h>
31#include <linux/timekeeping.h>
32#include <linux/timekeeper_internal.h>
33
34#include <linux/mm.h>
35
36struct start_info _xen_start_info;
37struct start_info *xen_start_info = &_xen_start_info;
38EXPORT_SYMBOL(xen_start_info);
39
40enum xen_domain_type xen_domain_type = XEN_NATIVE;
41EXPORT_SYMBOL(xen_domain_type);
42
43struct shared_info xen_dummy_shared_info;
44struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
45
46DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
47static struct vcpu_info __percpu *xen_vcpu_info;
48
49/* These are unused until we support booting "pre-ballooned" */
50unsigned long xen_released_pages;
51struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
52
53static __read_mostly unsigned int xen_events_irq;
54
55static __initdata struct device_node *xen_node;
56
57int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
58 unsigned long addr,
59 xen_pfn_t *gfn, int nr,
60 int *err_ptr, pgprot_t prot,
61 unsigned domid,
62 struct page **pages)
63{
64 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
65 prot, domid, pages);
66}
67EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
68
69/* Not used by XENFEAT_auto_translated guests. */
70int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
71 unsigned long addr,
72 xen_pfn_t gfn, int nr,
73 pgprot_t prot, unsigned domid,
74 struct page **pages)
75{
76 return -ENOSYS;
77}
78EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
79
80int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
81 int nr, struct page **pages)
82{
83 return xen_xlate_unmap_gfn_range(vma, nr, pages);
84}
85EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
86
87static unsigned long long xen_stolen_accounting(int cpu)
88{
89 struct vcpu_runstate_info state;
90
91 BUG_ON(cpu != smp_processor_id());
92
93 xen_get_runstate_snapshot(&state);
94
95 WARN_ON(state.state != RUNSTATE_running);
96
97 return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline];
98}
99
100static void xen_read_wallclock(struct timespec64 *ts)
101{
102 u32 version;
103 struct timespec64 now, ts_monotonic;
104 struct shared_info *s = HYPERVISOR_shared_info;
105 struct pvclock_wall_clock *wall_clock = &(s->wc);
106
107 /* get wallclock at system boot */
108 do {
109 version = wall_clock->version;
110 rmb(); /* fetch version before time */
111 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
112 now.tv_nsec = wall_clock->nsec;
113 rmb(); /* fetch time before checking version */
114 } while ((wall_clock->version & 1) || (version != wall_clock->version));
115
116 /* time since system boot */
117 ktime_get_ts64(&ts_monotonic);
118 *ts = timespec64_add(now, ts_monotonic);
119}
120
121static int xen_pvclock_gtod_notify(struct notifier_block *nb,
122 unsigned long was_set, void *priv)
123{
124 /* Protected by the calling core code serialization */
125 static struct timespec64 next_sync;
126
127 struct xen_platform_op op;
128 struct timespec64 now, system_time;
129 struct timekeeper *tk = priv;
130
131 now.tv_sec = tk->xtime_sec;
132 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
133 system_time = timespec64_add(now, tk->wall_to_monotonic);
134
135 /*
136 * We only take the expensive HV call when the clock was set
137 * or when the 11 minutes RTC synchronization time elapsed.
138 */
139 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
140 return NOTIFY_OK;
141
142 op.cmd = XENPF_settime64;
143 op.u.settime64.mbz = 0;
144 op.u.settime64.secs = now.tv_sec;
145 op.u.settime64.nsecs = now.tv_nsec;
146 op.u.settime64.system_time = timespec64_to_ns(&system_time);
147 (void)HYPERVISOR_platform_op(&op);
148
149 /*
150 * Move the next drift compensation time 11 minutes
151 * ahead. That's emulating the sync_cmos_clock() update for
152 * the hardware RTC.
153 */
154 next_sync = now;
155 next_sync.tv_sec += 11 * 60;
156
157 return NOTIFY_OK;
158}
159
160static struct notifier_block xen_pvclock_gtod_notifier = {
161 .notifier_call = xen_pvclock_gtod_notify,
162};
163
164static void xen_percpu_init(void)
165{
166 struct vcpu_register_vcpu_info info;
167 struct vcpu_info *vcpup;
168 int err;
169 int cpu = get_cpu();
170
171 /*
172 * VCPUOP_register_vcpu_info cannot be called twice for the same
173 * vcpu, so if vcpu_info is already registered, just get out. This
174 * can happen with cpu-hotplug.
175 */
176 if (per_cpu(xen_vcpu, cpu) != NULL)
177 goto after_register_vcpu_info;
178
179 pr_info("Xen: initializing cpu%d\n", cpu);
180 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
181
182 info.mfn = virt_to_gfn(vcpup);
183 info.offset = xen_offset_in_page(vcpup);
184
185 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
186 BUG_ON(err);
187 per_cpu(xen_vcpu, cpu) = vcpup;
188
189 xen_setup_runstate_info(cpu);
190
191after_register_vcpu_info:
192 enable_percpu_irq(xen_events_irq, 0);
193 put_cpu();
194}
195
196static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
197{
198 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
199 int rc;
200 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
201 BUG_ON(rc);
202}
203
204static void xen_power_off(void)
205{
206 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
207 int rc;
208 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
209 BUG_ON(rc);
210}
211
212static int xen_cpu_notification(struct notifier_block *self,
213 unsigned long action,
214 void *hcpu)
215{
216 switch (action) {
217 case CPU_STARTING:
218 xen_percpu_init();
219 break;
220 case CPU_DYING:
221 disable_percpu_irq(xen_events_irq);
222 break;
223 default:
224 break;
225 }
226
227 return NOTIFY_OK;
228}
229
230static struct notifier_block xen_cpu_notifier = {
231 .notifier_call = xen_cpu_notification,
232};
233
234static irqreturn_t xen_arm_callback(int irq, void *arg)
235{
236 xen_hvm_evtchn_do_upcall();
237 return IRQ_HANDLED;
238}
239
240/*
241 * see Documentation/devicetree/bindings/arm/xen.txt for the
242 * documentation of the Xen Device Tree format.
243 */
244#define GRANT_TABLE_PHYSADDR 0
245void __init xen_early_init(void)
246{
247 int len;
248 const char *s = NULL;
249 const char *version = NULL;
250 const char *xen_prefix = "xen,xen-";
251
252 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
253 if (!xen_node) {
254 pr_debug("No Xen support\n");
255 return;
256 }
257 s = of_get_property(xen_node, "compatible", &len);
258 if (strlen(xen_prefix) + 3 < len &&
259 !strncmp(xen_prefix, s, strlen(xen_prefix)))
260 version = s + strlen(xen_prefix);
261 if (version == NULL) {
262 pr_debug("Xen version not found\n");
263 return;
264 }
265
266 pr_info("Xen %s support found\n", version);
267
268 xen_domain_type = XEN_HVM_DOMAIN;
269
270 xen_setup_features();
271
272 if (xen_feature(XENFEAT_dom0))
273 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
274 else
275 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
276
277 if (!console_set_on_cmdline && !xen_initial_domain())
278 add_preferred_console("hvc", 0, NULL);
279}
280
281static int __init xen_guest_init(void)
282{
283 struct xen_add_to_physmap xatp;
284 struct shared_info *shared_info_page = NULL;
285 struct resource res;
286 phys_addr_t grant_frames;
287
288 if (!xen_domain())
289 return 0;
290
291 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
292 pr_err("Xen grant table base address not found\n");
293 return -ENODEV;
294 }
295 grant_frames = res.start;
296
297 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
298 if (!xen_events_irq) {
299 pr_err("Xen event channel interrupt not found\n");
300 return -ENODEV;
301 }
302
303 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
304
305 if (!shared_info_page) {
306 pr_err("not enough memory\n");
307 return -ENOMEM;
308 }
309 xatp.domid = DOMID_SELF;
310 xatp.idx = 0;
311 xatp.space = XENMAPSPACE_shared_info;
312 xatp.gpfn = virt_to_gfn(shared_info_page);
313 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
314 BUG();
315
316 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
317
318 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
319 * page, we use it in the event channel upcall and in some pvclock
320 * related functions.
321 * The shared info contains exactly 1 CPU (the boot CPU). The guest
322 * is required to use VCPUOP_register_vcpu_info to place vcpu info
323 * for secondary CPUs as they are brought up.
324 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
325 */
326 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
327 sizeof(struct vcpu_info));
328 if (xen_vcpu_info == NULL)
329 return -ENOMEM;
330
331 if (gnttab_setup_auto_xlat_frames(grant_frames)) {
332 free_percpu(xen_vcpu_info);
333 return -ENOMEM;
334 }
335 gnttab_init();
336 if (!xen_initial_domain())
337 xenbus_probe(NULL);
338
339 /*
340 * Making sure board specific code will not set up ops for
341 * cpu idle and cpu freq.
342 */
343 disable_cpuidle();
344 disable_cpufreq();
345
346 xen_init_IRQ();
347
348 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
349 "events", &xen_vcpu)) {
350 pr_err("Error request IRQ %d\n", xen_events_irq);
351 return -EINVAL;
352 }
353
354 xen_percpu_init();
355
356 register_cpu_notifier(&xen_cpu_notifier);
357
358 pv_time_ops.steal_clock = xen_stolen_accounting;
359 static_key_slow_inc(¶virt_steal_enabled);
360 if (xen_initial_domain())
361 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
362
363 return 0;
364}
365early_initcall(xen_guest_init);
366
367static int __init xen_pm_init(void)
368{
369 if (!xen_domain())
370 return -ENODEV;
371
372 pm_power_off = xen_power_off;
373 arm_pm_restart = xen_restart;
374 if (!xen_initial_domain()) {
375 struct timespec64 ts;
376 xen_read_wallclock(&ts);
377 do_settimeofday64(&ts);
378 }
379
380 return 0;
381}
382late_initcall(xen_pm_init);
383
384
385/* empty stubs */
386void xen_arch_pre_suspend(void) { }
387void xen_arch_post_suspend(int suspend_cancelled) { }
388void xen_timer_resume(void) { }
389void xen_arch_resume(void) { }
390void xen_arch_suspend(void) { }
391
392
393/* In the hypercall.S file. */
394EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
395EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
396EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
397EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
398EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
399EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
400EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
401EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
402EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
403EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
404EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
405EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
406EXPORT_SYMBOL_GPL(privcmd_call);