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