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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/xen/xen-ops.h>
 19 #include <asm/system_misc.h>
 20 #include <asm/efi.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/irqreturn.h>
 23 #include <linux/module.h>
 24 #include <linux/of.h>
 25 #include <linux/of_fdt.h>
 26 #include <linux/of_irq.h>
 27 #include <linux/of_address.h>
 28 #include <linux/cpuidle.h>
 29 #include <linux/cpufreq.h>
 30 #include <linux/cpu.h>
 31 #include <linux/console.h>
 32 #include <linux/pvclock_gtod.h>
 33 #include <linux/time64.h>
 34 #include <linux/timekeeping.h>
 35 #include <linux/timekeeper_internal.h>
 36 #include <linux/acpi.h>
 37 
 38 #include <linux/mm.h>
 39 
 40 struct start_info _xen_start_info;
 41 struct start_info *xen_start_info = &_xen_start_info;
 42 EXPORT_SYMBOL(xen_start_info);
 43 
 44 enum xen_domain_type xen_domain_type = XEN_NATIVE;
 45 EXPORT_SYMBOL(xen_domain_type);
 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);
 51 static struct vcpu_info __percpu *xen_vcpu_info;
 52 
 53 /* Linux <-> Xen vCPU id mapping */
 54 DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
 55 EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
 56 
 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 
 61 static __read_mostly unsigned int xen_events_irq;
 62 
 63 uint32_t xen_start_flags;
 64 EXPORT_SYMBOL(xen_start_flags);
 65 
 66 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 67                                int nr, struct page **pages)
 68 {
 69         return xen_xlate_unmap_gfn_range(vma, nr, pages);
 70 }
 71 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
 72 
 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 
 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 
137 static int xen_starting_cpu(unsigned int cpu)
138 {
139         struct vcpu_register_vcpu_info info;
140         struct vcpu_info *vcpup;
141         int err;
142 
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 
151         pr_info("Xen: initializing cpu%d\n", cpu);
152         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
153 
154         info.mfn = virt_to_gfn(vcpup);
155         info.offset = xen_offset_in_page(vcpup);
156 
157         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
158                                  &info);
159         BUG_ON(err);
160         per_cpu(xen_vcpu, cpu) = vcpup;
161 
162         xen_setup_runstate_info(cpu);
163 
164 after_register_vcpu_info:
165         enable_percpu_irq(xen_events_irq, 0);
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;
173 }
174 
175 void xen_reboot(int reason)
176 {
177         struct sched_shutdown r = { .reason = reason };
178         int rc;
179 
180         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
181         BUG_ON(rc);
182 }
183 
184 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
185 {
186         xen_reboot(SHUTDOWN_reboot);
187 }
188 
189 
190 static void xen_power_off(void)
191 {
192         xen_reboot(SHUTDOWN_poweroff);
193 }
194 
195 static irqreturn_t xen_arm_callback(int irq, void *arg)
196 {
197         xen_hvm_evtchn_do_upcall();
198         return IRQ_HANDLED;
199 }
200 
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 
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 
238         return 0;
239 }
240 
241 /*
242  * see Documentation/devicetree/bindings/arm/xen.txt for the
243  * documentation of the Xen Device Tree format.
244  */
245 #define GRANT_TABLE_PHYSADDR 0
246 void __init xen_early_init(void)
247 {
248         of_scan_flat_dt(fdt_find_hyper_node, NULL);
249         if (!hyper_node.found) {
250                 pr_debug("No Xen support\n");
251                 return;
252         }
253 
254         if (hyper_node.version == NULL) {
255                 pr_debug("Xen version not found\n");
256                 return;
257         }
258 
259         pr_info("Xen %s support found\n", hyper_node.version);
260 
261         xen_domain_type = XEN_HVM_DOMAIN;
262 
263         xen_setup_features();
264 
265         if (xen_feature(XENFEAT_dom0))
266                 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
267 
268         if (!console_set_on_cmdline && !xen_initial_domain())
269                 add_preferred_console("hvc", 0, NULL);
270 }
271 
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 {
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 
306         xen_events_irq = irq_of_parse_and_map(xen_node, 0);
307 }
308 
309 static int __init xen_guest_init(void)
310 {
311         struct xen_add_to_physmap xatp;
312         struct shared_info *shared_info_page = NULL;
313         int cpu;
314 
315         if (!xen_domain())
316                 return 0;
317 
318         if (!acpi_disabled)
319                 xen_acpi_guest_init();
320         else
321                 xen_dt_guest_init();
322 
323         if (!xen_events_irq) {
324                 pr_err("Xen event channel interrupt not found\n");
325                 return -ENODEV;
326         }
327 
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 
335         shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
336 
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;
344         xatp.gpfn = virt_to_gfn(shared_info_page);
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
352          * related functions. 
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
355          * for secondary CPUs as they are brought up.
356          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
357          */
358         xen_vcpu_info = alloc_percpu(struct vcpu_info);
359         if (xen_vcpu_info == NULL)
360                 return -ENOMEM;
361 
362         /* Direct vCPU id mapping for ARM guests. */
363         for_each_possible_cpu(cpu)
364                 per_cpu(xen_vcpu_id, cpu) = cpu;
365 
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)) {
370                 free_percpu(xen_vcpu_info);
371                 return -ENOMEM;
372         }
373         gnttab_init();
374         if (!xen_initial_domain())
375                 xenbus_probe(NULL);
376 
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 
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 
392         xen_time_setup_guest();
393 
394         if (xen_initial_domain())
395                 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
396 
397         return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
398                                  "arm/xen:starting", xen_starting_cpu,
399                                  xen_dying_cpu);
400 }
401 early_initcall(xen_guest_init);
402 
403 static int __init xen_pm_init(void)
404 {
405         if (!xen_domain())
406                 return -ENODEV;
407 
408         pm_power_off = xen_power_off;
409         arm_pm_restart = xen_restart;
410         if (!xen_initial_domain()) {
411                 struct timespec64 ts;
412                 xen_read_wallclock(&ts);
413                 do_settimeofday64(&ts);
414         }
415 
416         return 0;
417 }
418 late_initcall(xen_pm_init);
419 
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) { }
426 void xen_arch_suspend(void) { }
427 
428 
429 /* In the hypercall.S file. */
430 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
431 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
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);
438 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
439 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
440 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
441 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
442 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
443 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
444 EXPORT_SYMBOL_GPL(privcmd_call);
445 

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