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Linux/arch/arm/xen/enlighten.c

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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 
 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 int 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 }
 72 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
 73 
 74 /* Not used by XENFEAT_auto_translated guests. */
 75 int 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 }
 83 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
 84 
 85 int 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 }
 90 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
 91 
 92 static 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 
113 static 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 
152 static struct notifier_block xen_pvclock_gtod_notifier = {
153         .notifier_call = xen_pvclock_gtod_notify,
154 };
155 
156 static 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 
183 after_register_vcpu_info:
184         enable_percpu_irq(xen_events_irq, 0);
185         return 0;
186 }
187 
188 static int xen_dying_cpu(unsigned int cpu)
189 {
190         disable_percpu_irq(xen_events_irq);
191         return 0;
192 }
193 
194 void 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 
203 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
204 {
205         xen_reboot(SHUTDOWN_reboot);
206 }
207 
208 
209 static void xen_power_off(void)
210 {
211         xen_reboot(SHUTDOWN_poweroff);
212 }
213 
214 static irqreturn_t xen_arm_callback(int irq, void *arg)
215 {
216         xen_hvm_evtchn_do_upcall();
217         return IRQ_HANDLED;
218 }
219 
220 static __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 
227 static 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
265 void __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 
293 static 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 
317 static 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 
330 static 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 }
422 early_initcall(xen_guest_init);
423 
424 static 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 }
439 late_initcall(xen_pm_init);
440 
441 
442 /* empty stubs */
443 void xen_arch_pre_suspend(void) { }
444 void xen_arch_post_suspend(int suspend_cancelled) { }
445 void xen_timer_resume(void) { }
446 void xen_arch_resume(void) { }
447 void xen_arch_suspend(void) { }
448 
449 
450 /* In the hypercall.S file. */
451 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
452 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
453 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
454 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
455 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
456 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
457 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
458 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
459 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
460 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
461 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
462 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
463 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
464 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
465 EXPORT_SYMBOL_GPL(privcmd_call);
466 

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