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Linux/arch/arm/xen/enlighten.c

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  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/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 
 39 struct start_info _xen_start_info;
 40 struct start_info *xen_start_info = &_xen_start_info;
 41 EXPORT_SYMBOL(xen_start_info);
 42 
 43 enum xen_domain_type xen_domain_type = XEN_NATIVE;
 44 EXPORT_SYMBOL(xen_domain_type);
 45 
 46 struct shared_info xen_dummy_shared_info;
 47 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
 48 
 49 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
 50 static struct vcpu_info __percpu *xen_vcpu_info;
 51 
 52 /* Linux <-> Xen vCPU id mapping */
 53 DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
 54 EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
 55 
 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;
 59 
 60 static __read_mostly unsigned int xen_events_irq;
 61 
 62 uint32_t xen_start_flags;
 63 EXPORT_SYMBOL(xen_start_flags);
 64 
 65 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 66                                int nr, struct page **pages)
 67 {
 68         return xen_xlate_unmap_gfn_range(vma, nr, pages);
 69 }
 70 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
 71 
 72 static void xen_read_wallclock(struct timespec64 *ts)
 73 {
 74         u32 version;
 75         struct timespec64 now, ts_monotonic;
 76         struct shared_info *s = HYPERVISOR_shared_info;
 77         struct pvclock_wall_clock *wall_clock = &(s->wc);
 78 
 79         /* get wallclock at system boot */
 80         do {
 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));
 87 
 88         /* time since system boot */
 89         ktime_get_ts64(&ts_monotonic);
 90         *ts = timespec64_add(now, ts_monotonic);
 91 }
 92 
 93 static int xen_pvclock_gtod_notify(struct notifier_block *nb,
 94                                    unsigned long was_set, void *priv)
 95 {
 96         /* Protected by the calling core code serialization */
 97         static struct timespec64 next_sync;
 98 
 99         struct xen_platform_op op;
100         struct timespec64 now, system_time;
101         struct timekeeper *tk = priv;
102 
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);
106 
107         /*
108          * We only take the expensive HV call when the clock was set
109          * or when the 11 minutes RTC synchronization time elapsed.
110          */
111         if (!was_set && timespec64_compare(&now, &next_sync) < 0)
112                 return NOTIFY_OK;
113 
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);
120 
121         /*
122          * Move the next drift compensation time 11 minutes
123          * ahead. That's emulating the sync_cmos_clock() update for
124          * the hardware RTC.
125          */
126         next_sync = now;
127         next_sync.tv_sec += 11 * 60;
128 
129         return NOTIFY_OK;
130 }
131 
132 static struct notifier_block xen_pvclock_gtod_notifier = {
133         .notifier_call = xen_pvclock_gtod_notify,
134 };
135 
136 static int xen_starting_cpu(unsigned int cpu)
137 {
138         struct vcpu_register_vcpu_info info;
139         struct vcpu_info *vcpup;
140         int err;
141 
142         /* 
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.
146          */
147         if (per_cpu(xen_vcpu, cpu) != NULL)
148                 goto after_register_vcpu_info;
149 
150         pr_info("Xen: initializing cpu%d\n", cpu);
151         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
152 
153         info.mfn = virt_to_gfn(vcpup);
154         info.offset = xen_offset_in_page(vcpup);
155 
156         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
157                                  &info);
158         BUG_ON(err);
159         per_cpu(xen_vcpu, cpu) = vcpup;
160 
161         xen_setup_runstate_info(cpu);
162 
163 after_register_vcpu_info:
164         enable_percpu_irq(xen_events_irq, 0);
165         return 0;
166 }
167 
168 static int xen_dying_cpu(unsigned int cpu)
169 {
170         disable_percpu_irq(xen_events_irq);
171         return 0;
172 }
173 
174 void xen_reboot(int reason)
175 {
176         struct sched_shutdown r = { .reason = reason };
177         int rc;
178 
179         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
180         BUG_ON(rc);
181 }
182 
183 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
184 {
185         xen_reboot(SHUTDOWN_reboot);
186 }
187 
188 
189 static void xen_power_off(void)
190 {
191         xen_reboot(SHUTDOWN_poweroff);
192 }
193 
194 static irqreturn_t xen_arm_callback(int irq, void *arg)
195 {
196         xen_hvm_evtchn_do_upcall();
197         return IRQ_HANDLED;
198 }
199 
200 static __initdata struct {
201         const char *compat;
202         const char *prefix;
203         const char *version;
204         bool found;
205 } hyper_node = {"xen,xen", "xen,xen-", NULL, false};
206 
207 static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
208                                       int depth, void *data)
209 {
210         const void *s = NULL;
211         int len;
212 
213         if (depth != 1 || strcmp(uname, "hypervisor") != 0)
214                 return 0;
215 
216         if (of_flat_dt_is_compatible(node, hyper_node.compat))
217                 hyper_node.found = true;
218 
219         s = of_get_flat_dt_prop(node, "compatible", &len);
220         if (strlen(hyper_node.prefix) + 3  < len &&
221             !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
222                 hyper_node.version = s + strlen(hyper_node.prefix);
223 
224         /*
225          * Check if Xen supports EFI by checking whether there is the
226          * "/hypervisor/uefi" node in DT. If so, runtime services are available
227          * through proxy functions (e.g. in case of Xen dom0 EFI implementation
228          * they call special hypercall which executes relevant EFI functions)
229          * and that is why they are always enabled.
230          */
231         if (IS_ENABLED(CONFIG_XEN_EFI)) {
232                 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
233                     !efi_runtime_disabled())
234                         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
235         }
236 
237         return 0;
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
245 void __init xen_early_init(void)
246 {
247         of_scan_flat_dt(fdt_find_hyper_node, NULL);
248         if (!hyper_node.found) {
249                 pr_debug("No Xen support\n");
250                 return;
251         }
252 
253         if (hyper_node.version == NULL) {
254                 pr_debug("Xen version not found\n");
255                 return;
256         }
257 
258         pr_info("Xen %s support found\n", hyper_node.version);
259 
260         xen_domain_type = XEN_HVM_DOMAIN;
261 
262         xen_setup_features();
263 
264         if (xen_feature(XENFEAT_dom0))
265                 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
266 
267         if (!console_set_on_cmdline && !xen_initial_domain())
268                 add_preferred_console("hvc", 0, NULL);
269 }
270 
271 static void __init xen_acpi_guest_init(void)
272 {
273 #ifdef CONFIG_ACPI
274         struct xen_hvm_param a;
275         int interrupt, trigger, polarity;
276 
277         a.domid = DOMID_SELF;
278         a.index = HVM_PARAM_CALLBACK_IRQ;
279 
280         if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
281             || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
282                 xen_events_irq = 0;
283                 return;
284         }
285 
286         interrupt = a.value & 0xff;
287         trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
288                                          : ACPI_LEVEL_SENSITIVE;
289         polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
290                                           : ACPI_ACTIVE_HIGH;
291         xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
292 #endif
293 }
294 
295 static void __init xen_dt_guest_init(void)
296 {
297         struct device_node *xen_node;
298 
299         xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
300         if (!xen_node) {
301                 pr_err("Xen support was detected before, but it has disappeared\n");
302                 return;
303         }
304 
305         xen_events_irq = irq_of_parse_and_map(xen_node, 0);
306 }
307 
308 static int __init xen_guest_init(void)
309 {
310         struct xen_add_to_physmap xatp;
311         struct shared_info *shared_info_page = NULL;
312         int cpu;
313 
314         if (!xen_domain())
315                 return 0;
316 
317         if (!acpi_disabled)
318                 xen_acpi_guest_init();
319         else
320                 xen_dt_guest_init();
321 
322         if (!xen_events_irq) {
323                 pr_err("Xen event channel interrupt not found\n");
324                 return -ENODEV;
325         }
326 
327         /*
328          * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
329          * parameters are found. Force enable runtime services.
330          */
331         if (efi_enabled(EFI_RUNTIME_SERVICES))
332                 xen_efi_runtime_setup();
333 
334         shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
335 
336         if (!shared_info_page) {
337                 pr_err("not enough memory\n");
338                 return -ENOMEM;
339         }
340         xatp.domid = DOMID_SELF;
341         xatp.idx = 0;
342         xatp.space = XENMAPSPACE_shared_info;
343         xatp.gpfn = virt_to_gfn(shared_info_page);
344         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
345                 BUG();
346 
347         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
348 
349         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
350          * page, we use it in the event channel upcall and in some pvclock
351          * related functions. 
352          * The shared info contains exactly 1 CPU (the boot CPU). The guest
353          * is required to use VCPUOP_register_vcpu_info to place vcpu info
354          * for secondary CPUs as they are brought up.
355          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
356          */
357         xen_vcpu_info = alloc_percpu(struct vcpu_info);
358         if (xen_vcpu_info == NULL)
359                 return -ENOMEM;
360 
361         /* Direct vCPU id mapping for ARM guests. */
362         for_each_possible_cpu(cpu)
363                 per_cpu(xen_vcpu_id, cpu) = cpu;
364 
365         xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
366         if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
367                                           &xen_auto_xlat_grant_frames.vaddr,
368                                           xen_auto_xlat_grant_frames.count)) {
369                 free_percpu(xen_vcpu_info);
370                 return -ENOMEM;
371         }
372         gnttab_init();
373         if (!xen_initial_domain())
374                 xenbus_probe(NULL);
375 
376         /*
377          * Making sure board specific code will not set up ops for
378          * cpu idle and cpu freq.
379          */
380         disable_cpuidle();
381         disable_cpufreq();
382 
383         xen_init_IRQ();
384 
385         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
386                                "events", &xen_vcpu)) {
387                 pr_err("Error request IRQ %d\n", xen_events_irq);
388                 return -EINVAL;
389         }
390 
391         xen_time_setup_guest();
392 
393         if (xen_initial_domain())
394                 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
395 
396         return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
397                                  "arm/xen:starting", xen_starting_cpu,
398                                  xen_dying_cpu);
399 }
400 early_initcall(xen_guest_init);
401 
402 static int __init xen_pm_init(void)
403 {
404         if (!xen_domain())
405                 return -ENODEV;
406 
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);
413         }
414 
415         return 0;
416 }
417 late_initcall(xen_pm_init);
418 
419 
420 /* empty stubs */
421 void xen_arch_pre_suspend(void) { }
422 void xen_arch_post_suspend(int suspend_cancelled) { }
423 void xen_timer_resume(void) { }
424 void xen_arch_resume(void) { }
425 void xen_arch_suspend(void) { }
426 
427 
428 /* In the hypercall.S file. */
429 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
430 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
431 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
432 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
433 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
434 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
435 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
436 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
437 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
438 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
439 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
440 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
441 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
442 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
443 EXPORT_SYMBOL_GPL(privcmd_call);
444 

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