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 uint32_t xen_start_flags; 63 EXPORT_SYMBOL(xen_start_flags); 64 65 int xen_remap_domain_gfn_array(struct vm_area_struct *vma, 66 unsigned long addr, 67 xen_pfn_t *gfn, int nr, 68 int *err_ptr, pgprot_t prot, 69 unsigned domid, 70 struct page **pages) 71 { 72 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr, 73 prot, domid, pages); 74 } 75 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array); 76 77 /* Not used by XENFEAT_auto_translated guests. */ 78 int xen_remap_domain_gfn_range(struct vm_area_struct *vma, 79 unsigned long addr, 80 xen_pfn_t gfn, int nr, 81 pgprot_t prot, unsigned domid, 82 struct page **pages) 83 { 84 return -ENOSYS; 85 } 86 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range); 87 88 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, 89 int nr, struct page **pages) 90 { 91 return xen_xlate_unmap_gfn_range(vma, nr, pages); 92 } 93 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); 94 95 /* Not used by XENFEAT_auto_translated guests. */ 96 int xen_remap_domain_mfn_array(struct vm_area_struct *vma, 97 unsigned long addr, 98 xen_pfn_t *mfn, int nr, 99 int *err_ptr, pgprot_t prot, 100 unsigned int domid, struct page **pages) 101 { 102 return -ENOSYS; 103 } 104 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array); 105 106 static void xen_read_wallclock(struct timespec64 *ts) 107 { 108 u32 version; 109 struct timespec64 now, ts_monotonic; 110 struct shared_info *s = HYPERVISOR_shared_info; 111 struct pvclock_wall_clock *wall_clock = &(s->wc); 112 113 /* get wallclock at system boot */ 114 do { 115 version = wall_clock->version; 116 rmb(); /* fetch version before time */ 117 now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec; 118 now.tv_nsec = wall_clock->nsec; 119 rmb(); /* fetch time before checking version */ 120 } while ((wall_clock->version & 1) || (version != wall_clock->version)); 121 122 /* time since system boot */ 123 ktime_get_ts64(&ts_monotonic); 124 *ts = timespec64_add(now, ts_monotonic); 125 } 126 127 static int xen_pvclock_gtod_notify(struct notifier_block *nb, 128 unsigned long was_set, void *priv) 129 { 130 /* Protected by the calling core code serialization */ 131 static struct timespec64 next_sync; 132 133 struct xen_platform_op op; 134 struct timespec64 now, system_time; 135 struct timekeeper *tk = priv; 136 137 now.tv_sec = tk->xtime_sec; 138 now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); 139 system_time = timespec64_add(now, tk->wall_to_monotonic); 140 141 /* 142 * We only take the expensive HV call when the clock was set 143 * or when the 11 minutes RTC synchronization time elapsed. 144 */ 145 if (!was_set && timespec64_compare(&now, &next_sync) < 0) 146 return NOTIFY_OK; 147 148 op.cmd = XENPF_settime64; 149 op.u.settime64.mbz = 0; 150 op.u.settime64.secs = now.tv_sec; 151 op.u.settime64.nsecs = now.tv_nsec; 152 op.u.settime64.system_time = timespec64_to_ns(&system_time); 153 (void)HYPERVISOR_platform_op(&op); 154 155 /* 156 * Move the next drift compensation time 11 minutes 157 * ahead. That's emulating the sync_cmos_clock() update for 158 * the hardware RTC. 159 */ 160 next_sync = now; 161 next_sync.tv_sec += 11 * 60; 162 163 return NOTIFY_OK; 164 } 165 166 static struct notifier_block xen_pvclock_gtod_notifier = { 167 .notifier_call = xen_pvclock_gtod_notify, 168 }; 169 170 static int xen_starting_cpu(unsigned int cpu) 171 { 172 struct vcpu_register_vcpu_info info; 173 struct vcpu_info *vcpup; 174 int err; 175 176 /* 177 * VCPUOP_register_vcpu_info cannot be called twice for the same 178 * vcpu, so if vcpu_info is already registered, just get out. This 179 * can happen with cpu-hotplug. 180 */ 181 if (per_cpu(xen_vcpu, cpu) != NULL) 182 goto after_register_vcpu_info; 183 184 pr_info("Xen: initializing cpu%d\n", cpu); 185 vcpup = per_cpu_ptr(xen_vcpu_info, cpu); 186 187 info.mfn = virt_to_gfn(vcpup); 188 info.offset = xen_offset_in_page(vcpup); 189 190 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu), 191 &info); 192 BUG_ON(err); 193 per_cpu(xen_vcpu, cpu) = vcpup; 194 195 xen_setup_runstate_info(cpu); 196 197 after_register_vcpu_info: 198 enable_percpu_irq(xen_events_irq, 0); 199 return 0; 200 } 201 202 static int xen_dying_cpu(unsigned int cpu) 203 { 204 disable_percpu_irq(xen_events_irq); 205 return 0; 206 } 207 208 void xen_reboot(int reason) 209 { 210 struct sched_shutdown r = { .reason = reason }; 211 int rc; 212 213 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 214 BUG_ON(rc); 215 } 216 217 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) 218 { 219 xen_reboot(SHUTDOWN_reboot); 220 } 221 222 223 static void xen_power_off(void) 224 { 225 xen_reboot(SHUTDOWN_poweroff); 226 } 227 228 static irqreturn_t xen_arm_callback(int irq, void *arg) 229 { 230 xen_hvm_evtchn_do_upcall(); 231 return IRQ_HANDLED; 232 } 233 234 static __initdata struct { 235 const char *compat; 236 const char *prefix; 237 const char *version; 238 bool found; 239 } hyper_node = {"xen,xen", "xen,xen-", NULL, false}; 240 241 static int __init fdt_find_hyper_node(unsigned long node, const char *uname, 242 int depth, void *data) 243 { 244 const void *s = NULL; 245 int len; 246 247 if (depth != 1 || strcmp(uname, "hypervisor") != 0) 248 return 0; 249 250 if (of_flat_dt_is_compatible(node, hyper_node.compat)) 251 hyper_node.found = true; 252 253 s = of_get_flat_dt_prop(node, "compatible", &len); 254 if (strlen(hyper_node.prefix) + 3 < len && 255 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) 256 hyper_node.version = s + strlen(hyper_node.prefix); 257 258 /* 259 * Check if Xen supports EFI by checking whether there is the 260 * "/hypervisor/uefi" node in DT. If so, runtime services are available 261 * through proxy functions (e.g. in case of Xen dom0 EFI implementation 262 * they call special hypercall which executes relevant EFI functions) 263 * and that is why they are always enabled. 264 */ 265 if (IS_ENABLED(CONFIG_XEN_EFI)) { 266 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) && 267 !efi_runtime_disabled()) 268 set_bit(EFI_RUNTIME_SERVICES, &efi.flags); 269 } 270 271 return 0; 272 } 273 274 /* 275 * see Documentation/devicetree/bindings/arm/xen.txt for the 276 * documentation of the Xen Device Tree format. 277 */ 278 #define GRANT_TABLE_PHYSADDR 0 279 void __init xen_early_init(void) 280 { 281 of_scan_flat_dt(fdt_find_hyper_node, NULL); 282 if (!hyper_node.found) { 283 pr_debug("No Xen support\n"); 284 return; 285 } 286 287 if (hyper_node.version == NULL) { 288 pr_debug("Xen version not found\n"); 289 return; 290 } 291 292 pr_info("Xen %s support found\n", hyper_node.version); 293 294 xen_domain_type = XEN_HVM_DOMAIN; 295 296 xen_setup_features(); 297 298 if (xen_feature(XENFEAT_dom0)) 299 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 300 301 if (!console_set_on_cmdline && !xen_initial_domain()) 302 add_preferred_console("hvc", 0, NULL); 303 } 304 305 static void __init xen_acpi_guest_init(void) 306 { 307 #ifdef CONFIG_ACPI 308 struct xen_hvm_param a; 309 int interrupt, trigger, polarity; 310 311 a.domid = DOMID_SELF; 312 a.index = HVM_PARAM_CALLBACK_IRQ; 313 314 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a) 315 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) { 316 xen_events_irq = 0; 317 return; 318 } 319 320 interrupt = a.value & 0xff; 321 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE 322 : ACPI_LEVEL_SENSITIVE; 323 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW 324 : ACPI_ACTIVE_HIGH; 325 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity); 326 #endif 327 } 328 329 static void __init xen_dt_guest_init(void) 330 { 331 struct device_node *xen_node; 332 333 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); 334 if (!xen_node) { 335 pr_err("Xen support was detected before, but it has disappeared\n"); 336 return; 337 } 338 339 xen_events_irq = irq_of_parse_and_map(xen_node, 0); 340 } 341 342 static int __init xen_guest_init(void) 343 { 344 struct xen_add_to_physmap xatp; 345 struct shared_info *shared_info_page = NULL; 346 int cpu; 347 348 if (!xen_domain()) 349 return 0; 350 351 if (!acpi_disabled) 352 xen_acpi_guest_init(); 353 else 354 xen_dt_guest_init(); 355 356 if (!xen_events_irq) { 357 pr_err("Xen event channel interrupt not found\n"); 358 return -ENODEV; 359 } 360 361 /* 362 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI 363 * parameters are found. Force enable runtime services. 364 */ 365 if (efi_enabled(EFI_RUNTIME_SERVICES)) 366 xen_efi_runtime_setup(); 367 368 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); 369 370 if (!shared_info_page) { 371 pr_err("not enough memory\n"); 372 return -ENOMEM; 373 } 374 xatp.domid = DOMID_SELF; 375 xatp.idx = 0; 376 xatp.space = XENMAPSPACE_shared_info; 377 xatp.gpfn = virt_to_gfn(shared_info_page); 378 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 379 BUG(); 380 381 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 382 383 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 384 * page, we use it in the event channel upcall and in some pvclock 385 * related functions. 386 * The shared info contains exactly 1 CPU (the boot CPU). The guest 387 * is required to use VCPUOP_register_vcpu_info to place vcpu info 388 * for secondary CPUs as they are brought up. 389 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. 390 */ 391 xen_vcpu_info = alloc_percpu(struct vcpu_info); 392 if (xen_vcpu_info == NULL) 393 return -ENOMEM; 394 395 /* Direct vCPU id mapping for ARM guests. */ 396 for_each_possible_cpu(cpu) 397 per_cpu(xen_vcpu_id, cpu) = cpu; 398 399 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames(); 400 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn, 401 &xen_auto_xlat_grant_frames.vaddr, 402 xen_auto_xlat_grant_frames.count)) { 403 free_percpu(xen_vcpu_info); 404 return -ENOMEM; 405 } 406 gnttab_init(); 407 if (!xen_initial_domain()) 408 xenbus_probe(NULL); 409 410 /* 411 * Making sure board specific code will not set up ops for 412 * cpu idle and cpu freq. 413 */ 414 disable_cpuidle(); 415 disable_cpufreq(); 416 417 xen_init_IRQ(); 418 419 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 420 "events", &xen_vcpu)) { 421 pr_err("Error request IRQ %d\n", xen_events_irq); 422 return -EINVAL; 423 } 424 425 xen_time_setup_guest(); 426 427 if (xen_initial_domain()) 428 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier); 429 430 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING, 431 "arm/xen:starting", xen_starting_cpu, 432 xen_dying_cpu); 433 } 434 early_initcall(xen_guest_init); 435 436 static int __init xen_pm_init(void) 437 { 438 if (!xen_domain()) 439 return -ENODEV; 440 441 pm_power_off = xen_power_off; 442 arm_pm_restart = xen_restart; 443 if (!xen_initial_domain()) { 444 struct timespec64 ts; 445 xen_read_wallclock(&ts); 446 do_settimeofday64(&ts); 447 } 448 449 return 0; 450 } 451 late_initcall(xen_pm_init); 452 453 454 /* empty stubs */ 455 void xen_arch_pre_suspend(void) { } 456 void xen_arch_post_suspend(int suspend_cancelled) { } 457 void xen_timer_resume(void) { } 458 void xen_arch_resume(void) { } 459 void xen_arch_suspend(void) { } 460 461 462 /* In the hypercall.S file. */ 463 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 464 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 465 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 466 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 467 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 468 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 469 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 470 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 471 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); 472 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); 473 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op); 474 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); 475 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist); 476 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op); 477 EXPORT_SYMBOL_GPL(privcmd_call); 478