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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4c071ee5 | 2 | #include <xen/xen.h> |
0ec53ecf | 3 | #include <xen/events.h> |
b3b52fd8 SS |
4 | #include <xen/grant_table.h> |
5 | #include <xen/hvm.h> | |
9a9ab3cc | 6 | #include <xen/interface/vcpu.h> |
4c071ee5 SS |
7 | #include <xen/interface/xen.h> |
8 | #include <xen/interface/memory.h> | |
b3b52fd8 | 9 | #include <xen/interface/hvm/params.h> |
ef61ee0d | 10 | #include <xen/features.h> |
4c071ee5 | 11 | #include <xen/platform_pci.h> |
b3b52fd8 | 12 | #include <xen/xenbus.h> |
c61ba729 | 13 | #include <xen/page.h> |
6abb749e | 14 | #include <xen/interface/sched.h> |
f832da06 | 15 | #include <xen/xen-ops.h> |
4c071ee5 SS |
16 | #include <asm/xen/hypervisor.h> |
17 | #include <asm/xen/hypercall.h> | |
0cac5c30 | 18 | #include <asm/xen/xen-ops.h> |
6abb749e | 19 | #include <asm/system_misc.h> |
0cac5c30 | 20 | #include <asm/efi.h> |
0ec53ecf SS |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irqreturn.h> | |
4c071ee5 | 23 | #include <linux/module.h> |
2e01f166 | 24 | #include <linux/of.h> |
9b08aaa3 | 25 | #include <linux/of_fdt.h> |
2e01f166 SS |
26 | #include <linux/of_irq.h> |
27 | #include <linux/of_address.h> | |
e1a9c16b JG |
28 | #include <linux/cpuidle.h> |
29 | #include <linux/cpufreq.h> | |
8b271d57 | 30 | #include <linux/cpu.h> |
f1dddd11 | 31 | #include <linux/console.h> |
7d5f6f81 SS |
32 | #include <linux/pvclock_gtod.h> |
33 | #include <linux/time64.h> | |
e709fba1 | 34 | #include <linux/timekeeping.h> |
7d5f6f81 | 35 | #include <linux/timekeeper_internal.h> |
d22cbe65 | 36 | #include <linux/acpi.h> |
4c071ee5 | 37 | |
f832da06 IC |
38 | #include <linux/mm.h> |
39 | ||
4c071ee5 SS |
40 | struct start_info _xen_start_info; |
41 | struct start_info *xen_start_info = &_xen_start_info; | |
35c8ab4c | 42 | EXPORT_SYMBOL(xen_start_info); |
4c071ee5 SS |
43 | |
44 | enum xen_domain_type xen_domain_type = XEN_NATIVE; | |
35c8ab4c | 45 | EXPORT_SYMBOL(xen_domain_type); |
4c071ee5 SS |
46 | |
47 | struct shared_info xen_dummy_shared_info; | |
48 | struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; | |
49 | ||
50 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); | |
9a9ab3cc | 51 | static struct vcpu_info __percpu *xen_vcpu_info; |
4c071ee5 | 52 | |
88e957d6 | 53 | /* Linux <-> Xen vCPU id mapping */ |
55467dea | 54 | DEFINE_PER_CPU(uint32_t, xen_vcpu_id); |
88e957d6 VK |
55 | EXPORT_PER_CPU_SYMBOL(xen_vcpu_id); |
56 | ||
c61ba729 IC |
57 | /* These are unused until we support booting "pre-ballooned" */ |
58 | unsigned long xen_released_pages; | |
59 | struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; | |
60 | ||
81e863c3 | 61 | static __read_mostly unsigned int xen_events_irq; |
0ec53ecf | 62 | |
1fe83888 RPM |
63 | uint32_t xen_start_flags; |
64 | EXPORT_SYMBOL(xen_start_flags); | |
65 | ||
a13d7201 | 66 | int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, |
f832da06 IC |
67 | int nr, struct page **pages) |
68 | { | |
628c28ee | 69 | return xen_xlate_unmap_gfn_range(vma, nr, pages); |
f832da06 | 70 | } |
a13d7201 | 71 | EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); |
f832da06 | 72 | |
e709fba1 SS |
73 | static void xen_read_wallclock(struct timespec64 *ts) |
74 | { | |
75 | u32 version; | |
76 | struct timespec64 now, ts_monotonic; | |
77 | struct shared_info *s = HYPERVISOR_shared_info; | |
78 | struct pvclock_wall_clock *wall_clock = &(s->wc); | |
79 | ||
80 | /* get wallclock at system boot */ | |
81 | do { | |
82 | version = wall_clock->version; | |
83 | rmb(); /* fetch version before time */ | |
84 | now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec; | |
85 | now.tv_nsec = wall_clock->nsec; | |
86 | rmb(); /* fetch time before checking version */ | |
87 | } while ((wall_clock->version & 1) || (version != wall_clock->version)); | |
88 | ||
89 | /* time since system boot */ | |
90 | ktime_get_ts64(&ts_monotonic); | |
91 | *ts = timespec64_add(now, ts_monotonic); | |
92 | } | |
93 | ||
7d5f6f81 SS |
94 | static int xen_pvclock_gtod_notify(struct notifier_block *nb, |
95 | unsigned long was_set, void *priv) | |
96 | { | |
97 | /* Protected by the calling core code serialization */ | |
98 | static struct timespec64 next_sync; | |
99 | ||
100 | struct xen_platform_op op; | |
101 | struct timespec64 now, system_time; | |
102 | struct timekeeper *tk = priv; | |
103 | ||
104 | now.tv_sec = tk->xtime_sec; | |
105 | now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); | |
106 | system_time = timespec64_add(now, tk->wall_to_monotonic); | |
107 | ||
108 | /* | |
109 | * We only take the expensive HV call when the clock was set | |
110 | * or when the 11 minutes RTC synchronization time elapsed. | |
111 | */ | |
112 | if (!was_set && timespec64_compare(&now, &next_sync) < 0) | |
113 | return NOTIFY_OK; | |
114 | ||
115 | op.cmd = XENPF_settime64; | |
116 | op.u.settime64.mbz = 0; | |
117 | op.u.settime64.secs = now.tv_sec; | |
118 | op.u.settime64.nsecs = now.tv_nsec; | |
119 | op.u.settime64.system_time = timespec64_to_ns(&system_time); | |
120 | (void)HYPERVISOR_platform_op(&op); | |
121 | ||
122 | /* | |
123 | * Move the next drift compensation time 11 minutes | |
124 | * ahead. That's emulating the sync_cmos_clock() update for | |
125 | * the hardware RTC. | |
126 | */ | |
127 | next_sync = now; | |
128 | next_sync.tv_sec += 11 * 60; | |
129 | ||
130 | return NOTIFY_OK; | |
131 | } | |
132 | ||
133 | static struct notifier_block xen_pvclock_gtod_notifier = { | |
134 | .notifier_call = xen_pvclock_gtod_notify, | |
135 | }; | |
136 | ||
4761adb6 | 137 | static int xen_starting_cpu(unsigned int cpu) |
9a9ab3cc SS |
138 | { |
139 | struct vcpu_register_vcpu_info info; | |
140 | struct vcpu_info *vcpup; | |
141 | int err; | |
142 | ||
cb9644bf SS |
143 | /* |
144 | * VCPUOP_register_vcpu_info cannot be called twice for the same | |
145 | * vcpu, so if vcpu_info is already registered, just get out. This | |
146 | * can happen with cpu-hotplug. | |
147 | */ | |
148 | if (per_cpu(xen_vcpu, cpu) != NULL) | |
149 | goto after_register_vcpu_info; | |
150 | ||
9a9ab3cc SS |
151 | pr_info("Xen: initializing cpu%d\n", cpu); |
152 | vcpup = per_cpu_ptr(xen_vcpu_info, cpu); | |
153 | ||
250c9af3 JG |
154 | info.mfn = virt_to_gfn(vcpup); |
155 | info.offset = xen_offset_in_page(vcpup); | |
9a9ab3cc | 156 | |
ad5475f9 VK |
157 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu), |
158 | &info); | |
d7266d78 SS |
159 | BUG_ON(err); |
160 | per_cpu(xen_vcpu, cpu) = vcpup; | |
161 | ||
34e38523 SS |
162 | xen_setup_runstate_info(cpu); |
163 | ||
cb9644bf | 164 | after_register_vcpu_info: |
3cc8e40e | 165 | enable_percpu_irq(xen_events_irq, 0); |
4761adb6 RC |
166 | return 0; |
167 | } | |
168 | ||
169 | static int xen_dying_cpu(unsigned int cpu) | |
170 | { | |
171 | disable_percpu_irq(xen_events_irq); | |
172 | return 0; | |
9a9ab3cc SS |
173 | } |
174 | ||
fa12a870 | 175 | void xen_reboot(int reason) |
6abb749e | 176 | { |
fa12a870 | 177 | struct sched_shutdown r = { .reason = reason }; |
6abb749e | 178 | int rc; |
fa12a870 | 179 | |
6abb749e | 180 | rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); |
a91c7775 | 181 | BUG_ON(rc); |
6abb749e SS |
182 | } |
183 | ||
fa12a870 JG |
184 | static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) |
185 | { | |
186 | xen_reboot(SHUTDOWN_reboot); | |
187 | } | |
188 | ||
189 | ||
6abb749e SS |
190 | static void xen_power_off(void) |
191 | { | |
fa12a870 | 192 | xen_reboot(SHUTDOWN_poweroff); |
6abb749e SS |
193 | } |
194 | ||
8b271d57 JG |
195 | static irqreturn_t xen_arm_callback(int irq, void *arg) |
196 | { | |
197 | xen_hvm_evtchn_do_upcall(); | |
198 | return IRQ_HANDLED; | |
199 | } | |
200 | ||
9b08aaa3 SZ |
201 | static __initdata struct { |
202 | const char *compat; | |
203 | const char *prefix; | |
204 | const char *version; | |
205 | bool found; | |
206 | } hyper_node = {"xen,xen", "xen,xen-", NULL, false}; | |
207 | ||
208 | static int __init fdt_find_hyper_node(unsigned long node, const char *uname, | |
209 | int depth, void *data) | |
210 | { | |
211 | const void *s = NULL; | |
212 | int len; | |
213 | ||
214 | if (depth != 1 || strcmp(uname, "hypervisor") != 0) | |
215 | return 0; | |
216 | ||
217 | if (of_flat_dt_is_compatible(node, hyper_node.compat)) | |
218 | hyper_node.found = true; | |
219 | ||
220 | s = of_get_flat_dt_prop(node, "compatible", &len); | |
221 | if (strlen(hyper_node.prefix) + 3 < len && | |
222 | !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) | |
223 | hyper_node.version = s + strlen(hyper_node.prefix); | |
224 | ||
0cac5c30 SZ |
225 | /* |
226 | * Check if Xen supports EFI by checking whether there is the | |
227 | * "/hypervisor/uefi" node in DT. If so, runtime services are available | |
228 | * through proxy functions (e.g. in case of Xen dom0 EFI implementation | |
229 | * they call special hypercall which executes relevant EFI functions) | |
230 | * and that is why they are always enabled. | |
231 | */ | |
232 | if (IS_ENABLED(CONFIG_XEN_EFI)) { | |
233 | if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) && | |
234 | !efi_runtime_disabled()) | |
235 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
236 | } | |
237 | ||
9b08aaa3 SZ |
238 | return 0; |
239 | } | |
240 | ||
2e01f166 SS |
241 | /* |
242 | * see Documentation/devicetree/bindings/arm/xen.txt for the | |
243 | * documentation of the Xen Device Tree format. | |
244 | */ | |
b3b52fd8 | 245 | #define GRANT_TABLE_PHYSADDR 0 |
5882bfef | 246 | void __init xen_early_init(void) |
2e01f166 | 247 | { |
9b08aaa3 SZ |
248 | of_scan_flat_dt(fdt_find_hyper_node, NULL); |
249 | if (!hyper_node.found) { | |
2e01f166 | 250 | pr_debug("No Xen support\n"); |
5882bfef | 251 | return; |
2e01f166 | 252 | } |
9b08aaa3 SZ |
253 | |
254 | if (hyper_node.version == NULL) { | |
2e01f166 | 255 | pr_debug("Xen version not found\n"); |
5882bfef | 256 | return; |
81e863c3 JG |
257 | } |
258 | ||
9b08aaa3 | 259 | pr_info("Xen %s support found\n", hyper_node.version); |
8b271d57 | 260 | |
2e01f166 SS |
261 | xen_domain_type = XEN_HVM_DOMAIN; |
262 | ||
ef61ee0d | 263 | xen_setup_features(); |
5ebc77de | 264 | |
ef61ee0d | 265 | if (xen_feature(XENFEAT_dom0)) |
1fe83888 | 266 | xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; |
f1dddd11 AB |
267 | |
268 | if (!console_set_on_cmdline && !xen_initial_domain()) | |
269 | add_preferred_console("hvc", 0, NULL); | |
5882bfef SS |
270 | } |
271 | ||
d22cbe65 SZ |
272 | static void __init xen_acpi_guest_init(void) |
273 | { | |
274 | #ifdef CONFIG_ACPI | |
275 | struct xen_hvm_param a; | |
276 | int interrupt, trigger, polarity; | |
277 | ||
278 | a.domid = DOMID_SELF; | |
279 | a.index = HVM_PARAM_CALLBACK_IRQ; | |
280 | ||
281 | if (HYPERVISOR_hvm_op(HVMOP_get_param, &a) | |
282 | || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) { | |
283 | xen_events_irq = 0; | |
284 | return; | |
285 | } | |
286 | ||
287 | interrupt = a.value & 0xff; | |
288 | trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE | |
289 | : ACPI_LEVEL_SENSITIVE; | |
290 | polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW | |
291 | : ACPI_ACTIVE_HIGH; | |
292 | xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity); | |
293 | #endif | |
294 | } | |
295 | ||
296 | static void __init xen_dt_guest_init(void) | |
297 | { | |
9b08aaa3 SZ |
298 | struct device_node *xen_node; |
299 | ||
300 | xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); | |
301 | if (!xen_node) { | |
302 | pr_err("Xen support was detected before, but it has disappeared\n"); | |
303 | return; | |
304 | } | |
305 | ||
d22cbe65 SZ |
306 | xen_events_irq = irq_of_parse_and_map(xen_node, 0); |
307 | } | |
308 | ||
5882bfef SS |
309 | static int __init xen_guest_init(void) |
310 | { | |
311 | struct xen_add_to_physmap xatp; | |
312 | struct shared_info *shared_info_page = NULL; | |
de75abbe | 313 | int cpu; |
5882bfef SS |
314 | |
315 | if (!xen_domain()) | |
316 | return 0; | |
317 | ||
d22cbe65 SZ |
318 | if (!acpi_disabled) |
319 | xen_acpi_guest_init(); | |
320 | else | |
321 | xen_dt_guest_init(); | |
322 | ||
5882bfef SS |
323 | if (!xen_events_irq) { |
324 | pr_err("Xen event channel interrupt not found\n"); | |
325 | return -ENODEV; | |
326 | } | |
327 | ||
0cac5c30 SZ |
328 | /* |
329 | * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI | |
330 | * parameters are found. Force enable runtime services. | |
331 | */ | |
332 | if (efi_enabled(EFI_RUNTIME_SERVICES)) | |
333 | xen_efi_runtime_setup(); | |
334 | ||
5882bfef | 335 | shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); |
ef61ee0d | 336 | |
2e01f166 SS |
337 | if (!shared_info_page) { |
338 | pr_err("not enough memory\n"); | |
339 | return -ENOMEM; | |
340 | } | |
341 | xatp.domid = DOMID_SELF; | |
342 | xatp.idx = 0; | |
343 | xatp.space = XENMAPSPACE_shared_info; | |
250c9af3 | 344 | xatp.gpfn = virt_to_gfn(shared_info_page); |
2e01f166 SS |
345 | if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) |
346 | BUG(); | |
347 | ||
348 | HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; | |
349 | ||
350 | /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info | |
351 | * page, we use it in the event channel upcall and in some pvclock | |
9a9ab3cc | 352 | * related functions. |
2e01f166 SS |
353 | * The shared info contains exactly 1 CPU (the boot CPU). The guest |
354 | * is required to use VCPUOP_register_vcpu_info to place vcpu info | |
9a9ab3cc SS |
355 | * for secondary CPUs as they are brought up. |
356 | * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. | |
357 | */ | |
24d5373d | 358 | xen_vcpu_info = alloc_percpu(struct vcpu_info); |
9a9ab3cc SS |
359 | if (xen_vcpu_info == NULL) |
360 | return -ENOMEM; | |
b3b52fd8 | 361 | |
88e957d6 | 362 | /* Direct vCPU id mapping for ARM guests. */ |
de75abbe VK |
363 | for_each_possible_cpu(cpu) |
364 | per_cpu(xen_vcpu_id, cpu) = cpu; | |
88e957d6 | 365 | |
3cf4095d SZ |
366 | xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames(); |
367 | if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn, | |
368 | &xen_auto_xlat_grant_frames.vaddr, | |
369 | xen_auto_xlat_grant_frames.count)) { | |
efaf30a3 KRW |
370 | free_percpu(xen_vcpu_info); |
371 | return -ENOMEM; | |
372 | } | |
b3b52fd8 SS |
373 | gnttab_init(); |
374 | if (!xen_initial_domain()) | |
375 | xenbus_probe(NULL); | |
376 | ||
e1a9c16b JG |
377 | /* |
378 | * Making sure board specific code will not set up ops for | |
379 | * cpu idle and cpu freq. | |
380 | */ | |
381 | disable_cpuidle(); | |
382 | disable_cpufreq(); | |
383 | ||
8b271d57 JG |
384 | xen_init_IRQ(); |
385 | ||
386 | if (request_percpu_irq(xen_events_irq, xen_arm_callback, | |
387 | "events", &xen_vcpu)) { | |
388 | pr_err("Error request IRQ %d\n", xen_events_irq); | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
ecb23dc6 JG |
392 | xen_time_setup_guest(); |
393 | ||
7d5f6f81 SS |
394 | if (xen_initial_domain()) |
395 | pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier); | |
34e38523 | 396 | |
4761adb6 | 397 | return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING, |
73c1b41e | 398 | "arm/xen:starting", xen_starting_cpu, |
4761adb6 | 399 | xen_dying_cpu); |
1aa3d8d9 | 400 | } |
8b271d57 | 401 | early_initcall(xen_guest_init); |
1aa3d8d9 SS |
402 | |
403 | static int __init xen_pm_init(void) | |
404 | { | |
9dd4b294 RH |
405 | if (!xen_domain()) |
406 | return -ENODEV; | |
407 | ||
6abb749e SS |
408 | pm_power_off = xen_power_off; |
409 | arm_pm_restart = xen_restart; | |
e709fba1 SS |
410 | if (!xen_initial_domain()) { |
411 | struct timespec64 ts; | |
412 | xen_read_wallclock(&ts); | |
413 | do_settimeofday64(&ts); | |
414 | } | |
6abb749e | 415 | |
2e01f166 SS |
416 | return 0; |
417 | } | |
9dd4b294 | 418 | late_initcall(xen_pm_init); |
0ec53ecf | 419 | |
79390289 SS |
420 | |
421 | /* empty stubs */ | |
422 | void xen_arch_pre_suspend(void) { } | |
423 | void xen_arch_post_suspend(int suspend_cancelled) { } | |
424 | void xen_timer_resume(void) { } | |
425 | void xen_arch_resume(void) { } | |
ffb7dbed | 426 | void xen_arch_suspend(void) { } |
79390289 SS |
427 | |
428 | ||
d5f985c8 | 429 | /* In the hypercall.S file. */ |
911dec0d KRW |
430 | EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); |
431 | EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); | |
ab277bbf SS |
432 | EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); |
433 | EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); | |
434 | EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); | |
435 | EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); | |
436 | EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); | |
437 | EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); | |
ea0af613 | 438 | EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); |
176455e9 | 439 | EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); |
72d39c69 | 440 | EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op); |
9f1d3414 | 441 | EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); |
4b5ae015 | 442 | EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist); |
ab520be8 | 443 | EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op); |
911dec0d | 444 | EXPORT_SYMBOL_GPL(privcmd_call); |