1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <xen/events.h>
4 #include <xen/grant_table.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>
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>
20 #include <linux/interrupt.h>
21 #include <linux/irqreturn.h>
22 #include <linux/module.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>
39 static struct start_info _xen_start_info;
40 struct start_info *xen_start_info = &_xen_start_info;
41 EXPORT_SYMBOL(xen_start_info);
43 enum xen_domain_type xen_domain_type = XEN_NATIVE;
44 EXPORT_SYMBOL(xen_domain_type);
46 struct shared_info xen_dummy_shared_info;
47 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
49 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
50 static struct vcpu_info __percpu *xen_vcpu_info;
52 /* Linux <-> Xen vCPU id mapping */
53 DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
54 EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
56 /* These are unused until we support booting "pre-ballooned" */
57 unsigned long xen_released_pages;
58 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
60 static __read_mostly unsigned int xen_events_irq;
62 uint32_t xen_start_flags;
63 EXPORT_SYMBOL(xen_start_flags);
65 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
66 int nr, struct page **pages)
68 return xen_xlate_unmap_gfn_range(vma, nr, pages);
70 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
72 static void xen_read_wallclock(struct timespec64 *ts)
75 struct timespec64 now, ts_monotonic;
76 struct shared_info *s = HYPERVISOR_shared_info;
77 struct pvclock_wall_clock *wall_clock = &(s->wc);
79 /* get wallclock at system boot */
81 version = wall_clock->version;
82 rmb(); /* fetch version before time */
83 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
84 now.tv_nsec = wall_clock->nsec;
85 rmb(); /* fetch time before checking version */
86 } while ((wall_clock->version & 1) || (version != wall_clock->version));
88 /* time since system boot */
89 ktime_get_ts64(&ts_monotonic);
90 *ts = timespec64_add(now, ts_monotonic);
93 static int xen_pvclock_gtod_notify(struct notifier_block *nb,
94 unsigned long was_set, void *priv)
96 /* Protected by the calling core code serialization */
97 static struct timespec64 next_sync;
99 struct xen_platform_op op;
100 struct timespec64 now, system_time;
101 struct timekeeper *tk = priv;
103 now.tv_sec = tk->xtime_sec;
104 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
105 system_time = timespec64_add(now, tk->wall_to_monotonic);
108 * We only take the expensive HV call when the clock was set
109 * or when the 11 minutes RTC synchronization time elapsed.
111 if (!was_set && timespec64_compare(&now, &next_sync) < 0)
114 op.cmd = XENPF_settime64;
115 op.u.settime64.mbz = 0;
116 op.u.settime64.secs = now.tv_sec;
117 op.u.settime64.nsecs = now.tv_nsec;
118 op.u.settime64.system_time = timespec64_to_ns(&system_time);
119 (void)HYPERVISOR_platform_op(&op);
122 * Move the next drift compensation time 11 minutes
123 * ahead. That's emulating the sync_cmos_clock() update for
127 next_sync.tv_sec += 11 * 60;
132 static struct notifier_block xen_pvclock_gtod_notifier = {
133 .notifier_call = xen_pvclock_gtod_notify,
136 static int xen_starting_cpu(unsigned int cpu)
138 struct vcpu_register_vcpu_info info;
139 struct vcpu_info *vcpup;
143 * VCPUOP_register_vcpu_info cannot be called twice for the same
144 * vcpu, so if vcpu_info is already registered, just get out. This
145 * can happen with cpu-hotplug.
147 if (per_cpu(xen_vcpu, cpu) != NULL)
148 goto after_register_vcpu_info;
150 pr_info("Xen: initializing cpu%d\n", cpu);
151 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
153 info.mfn = percpu_to_gfn(vcpup);
154 info.offset = xen_offset_in_page(vcpup);
156 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
159 per_cpu(xen_vcpu, cpu) = vcpup;
161 after_register_vcpu_info:
162 enable_percpu_irq(xen_events_irq, 0);
166 static int xen_dying_cpu(unsigned int cpu)
168 disable_percpu_irq(xen_events_irq);
172 void xen_reboot(int reason)
174 struct sched_shutdown r = { .reason = reason };
177 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
181 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
183 xen_reboot(SHUTDOWN_reboot);
187 static void xen_power_off(void)
189 xen_reboot(SHUTDOWN_poweroff);
192 static irqreturn_t xen_arm_callback(int irq, void *arg)
194 xen_hvm_evtchn_do_upcall();
198 static __initdata struct {
203 } hyper_node = {"xen,xen", "xen,xen-", NULL, false};
205 static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
206 int depth, void *data)
208 const void *s = NULL;
211 if (depth != 1 || strcmp(uname, "hypervisor") != 0)
214 if (of_flat_dt_is_compatible(node, hyper_node.compat))
215 hyper_node.found = true;
217 s = of_get_flat_dt_prop(node, "compatible", &len);
218 if (strlen(hyper_node.prefix) + 3 < len &&
219 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
220 hyper_node.version = s + strlen(hyper_node.prefix);
223 * Check if Xen supports EFI by checking whether there is the
224 * "/hypervisor/uefi" node in DT. If so, runtime services are available
225 * through proxy functions (e.g. in case of Xen dom0 EFI implementation
226 * they call special hypercall which executes relevant EFI functions)
227 * and that is why they are always enabled.
229 if (IS_ENABLED(CONFIG_XEN_EFI)) {
230 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
231 !efi_runtime_disabled())
232 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
239 * see Documentation/devicetree/bindings/arm/xen.txt for the
240 * documentation of the Xen Device Tree format.
242 void __init xen_early_init(void)
244 of_scan_flat_dt(fdt_find_hyper_node, NULL);
245 if (!hyper_node.found) {
246 pr_debug("No Xen support\n");
250 if (hyper_node.version == NULL) {
251 pr_debug("Xen version not found\n");
255 pr_info("Xen %s support found\n", hyper_node.version);
257 xen_domain_type = XEN_HVM_DOMAIN;
259 xen_setup_features();
261 if (xen_feature(XENFEAT_dom0))
262 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
264 if (!console_set_on_cmdline && !xen_initial_domain())
265 add_preferred_console("hvc", 0, NULL);
268 static void __init xen_acpi_guest_init(void)
271 struct xen_hvm_param a;
272 int interrupt, trigger, polarity;
274 a.domid = DOMID_SELF;
275 a.index = HVM_PARAM_CALLBACK_IRQ;
277 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
278 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
283 interrupt = a.value & 0xff;
284 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
285 : ACPI_LEVEL_SENSITIVE;
286 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
288 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
292 static void __init xen_dt_guest_init(void)
294 struct device_node *xen_node;
296 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
298 pr_err("Xen support was detected before, but it has disappeared\n");
302 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
305 static int __init xen_guest_init(void)
307 struct xen_add_to_physmap xatp;
308 struct shared_info *shared_info_page = NULL;
315 xen_acpi_guest_init();
319 if (!xen_events_irq) {
320 pr_err("Xen event channel interrupt not found\n");
325 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
326 * parameters are found. Force enable runtime services.
328 if (efi_enabled(EFI_RUNTIME_SERVICES))
329 xen_efi_runtime_setup();
331 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
333 if (!shared_info_page) {
334 pr_err("not enough memory\n");
337 xatp.domid = DOMID_SELF;
339 xatp.space = XENMAPSPACE_shared_info;
340 xatp.gpfn = virt_to_gfn(shared_info_page);
341 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
344 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
346 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
347 * page, we use it in the event channel upcall and in some pvclock
349 * The shared info contains exactly 1 CPU (the boot CPU). The guest
350 * is required to use VCPUOP_register_vcpu_info to place vcpu info
351 * for secondary CPUs as they are brought up.
352 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
354 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
355 1 << fls(sizeof(struct vcpu_info) - 1));
356 if (xen_vcpu_info == NULL)
359 /* Direct vCPU id mapping for ARM guests. */
360 for_each_possible_cpu(cpu)
361 per_cpu(xen_vcpu_id, cpu) = cpu;
363 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
364 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
365 &xen_auto_xlat_grant_frames.vaddr,
366 xen_auto_xlat_grant_frames.count)) {
367 free_percpu(xen_vcpu_info);
373 * Making sure board specific code will not set up ops for
374 * cpu idle and cpu freq.
381 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
382 "events", &xen_vcpu)) {
383 pr_err("Error request IRQ %d\n", xen_events_irq);
387 if (xen_initial_domain())
388 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
390 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
391 "arm/xen:starting", xen_starting_cpu,
394 early_initcall(xen_guest_init);
396 static int xen_starting_runstate_cpu(unsigned int cpu)
398 xen_setup_runstate_info(cpu);
402 static int __init xen_late_init(void)
407 pm_power_off = xen_power_off;
408 arm_pm_restart = xen_restart;
409 if (!xen_initial_domain()) {
410 struct timespec64 ts;
411 xen_read_wallclock(&ts);
412 do_settimeofday64(&ts);
415 if (xen_kernel_unmapped_at_usr())
418 xen_time_setup_guest();
420 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
421 "arm/xen_runstate:starting",
422 xen_starting_runstate_cpu, NULL);
424 late_initcall(xen_late_init);
428 void xen_arch_pre_suspend(void) { }
429 void xen_arch_post_suspend(int suspend_cancelled) { }
430 void xen_timer_resume(void) { }
431 void xen_arch_resume(void) { }
432 void xen_arch_suspend(void) { }
435 /* In the hypercall.S file. */
436 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
437 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
438 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
439 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
440 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
441 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
442 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
443 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
444 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
445 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
446 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
447 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
448 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
449 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
450 EXPORT_SYMBOL_GPL(privcmd_call);