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(int, xen_vcpu_id) = -1; 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 /* Direct vCPU id mapping for ARM guests. */ 174 per_cpu(xen_vcpu_id, cpu) = cpu; 175 176 info.mfn = virt_to_gfn(vcpup); 177 info.offset = xen_offset_in_page(vcpup); 178 179 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu), 180 &info); 181 BUG_ON(err); 182 per_cpu(xen_vcpu, cpu) = vcpup; 183 184 xen_setup_runstate_info(cpu); 185 186 after_register_vcpu_info: 187 enable_percpu_irq(xen_events_irq, 0); 188 return 0; 189 } 190 191 static int xen_dying_cpu(unsigned int cpu) 192 { 193 disable_percpu_irq(xen_events_irq); 194 return 0; 195 } 196 197 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) 198 { 199 struct sched_shutdown r = { .reason = SHUTDOWN_reboot }; 200 int rc; 201 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 202 BUG_ON(rc); 203 } 204 205 static void xen_power_off(void) 206 { 207 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff }; 208 int rc; 209 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 210 BUG_ON(rc); 211 } 212 213 static irqreturn_t xen_arm_callback(int irq, void *arg) 214 { 215 xen_hvm_evtchn_do_upcall(); 216 return IRQ_HANDLED; 217 } 218 219 static __initdata struct { 220 const char *compat; 221 const char *prefix; 222 const char *version; 223 bool found; 224 } hyper_node = {"xen,xen", "xen,xen-", NULL, false}; 225 226 static int __init fdt_find_hyper_node(unsigned long node, const char *uname, 227 int depth, void *data) 228 { 229 const void *s = NULL; 230 int len; 231 232 if (depth != 1 || strcmp(uname, "hypervisor") != 0) 233 return 0; 234 235 if (of_flat_dt_is_compatible(node, hyper_node.compat)) 236 hyper_node.found = true; 237 238 s = of_get_flat_dt_prop(node, "compatible", &len); 239 if (strlen(hyper_node.prefix) + 3 < len && 240 !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) 241 hyper_node.version = s + strlen(hyper_node.prefix); 242 243 /* 244 * Check if Xen supports EFI by checking whether there is the 245 * "/hypervisor/uefi" node in DT. If so, runtime services are available 246 * through proxy functions (e.g. in case of Xen dom0 EFI implementation 247 * they call special hypercall which executes relevant EFI functions) 248 * and that is why they are always enabled. 249 */ 250 if (IS_ENABLED(CONFIG_XEN_EFI)) { 251 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) && 252 !efi_runtime_disabled()) 253 set_bit(EFI_RUNTIME_SERVICES, &efi.flags); 254 } 255 256 return 0; 257 } 258 259 /* 260 * see Documentation/devicetree/bindings/arm/xen.txt for the 261 * documentation of the Xen Device Tree format. 262 */ 263 #define GRANT_TABLE_PHYSADDR 0 264 void __init xen_early_init(void) 265 { 266 of_scan_flat_dt(fdt_find_hyper_node, NULL); 267 if (!hyper_node.found) { 268 pr_debug("No Xen support\n"); 269 return; 270 } 271 272 if (hyper_node.version == NULL) { 273 pr_debug("Xen version not found\n"); 274 return; 275 } 276 277 pr_info("Xen %s support found\n", hyper_node.version); 278 279 xen_domain_type = XEN_HVM_DOMAIN; 280 281 xen_setup_features(); 282 283 if (xen_feature(XENFEAT_dom0)) 284 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 285 else 286 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); 287 288 if (!console_set_on_cmdline && !xen_initial_domain()) 289 add_preferred_console("hvc", 0, NULL); 290 } 291 292 static void __init xen_acpi_guest_init(void) 293 { 294 #ifdef CONFIG_ACPI 295 struct xen_hvm_param a; 296 int interrupt, trigger, polarity; 297 298 a.domid = DOMID_SELF; 299 a.index = HVM_PARAM_CALLBACK_IRQ; 300 301 if (HYPERVISOR_hvm_op(HVMOP_get_param, &a) 302 || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) { 303 xen_events_irq = 0; 304 return; 305 } 306 307 interrupt = a.value & 0xff; 308 trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE 309 : ACPI_LEVEL_SENSITIVE; 310 polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW 311 : ACPI_ACTIVE_HIGH; 312 xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity); 313 #endif 314 } 315 316 static void __init xen_dt_guest_init(void) 317 { 318 struct device_node *xen_node; 319 320 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); 321 if (!xen_node) { 322 pr_err("Xen support was detected before, but it has disappeared\n"); 323 return; 324 } 325 326 xen_events_irq = irq_of_parse_and_map(xen_node, 0); 327 } 328 329 static int __init xen_guest_init(void) 330 { 331 struct xen_add_to_physmap xatp; 332 struct shared_info *shared_info_page = NULL; 333 334 if (!xen_domain()) 335 return 0; 336 337 if (!acpi_disabled) 338 xen_acpi_guest_init(); 339 else 340 xen_dt_guest_init(); 341 342 if (!xen_events_irq) { 343 pr_err("Xen event channel interrupt not found\n"); 344 return -ENODEV; 345 } 346 347 /* 348 * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI 349 * parameters are found. Force enable runtime services. 350 */ 351 if (efi_enabled(EFI_RUNTIME_SERVICES)) 352 xen_efi_runtime_setup(); 353 354 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); 355 356 if (!shared_info_page) { 357 pr_err("not enough memory\n"); 358 return -ENOMEM; 359 } 360 xatp.domid = DOMID_SELF; 361 xatp.idx = 0; 362 xatp.space = XENMAPSPACE_shared_info; 363 xatp.gpfn = virt_to_gfn(shared_info_page); 364 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 365 BUG(); 366 367 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 368 369 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 370 * page, we use it in the event channel upcall and in some pvclock 371 * related functions. 372 * The shared info contains exactly 1 CPU (the boot CPU). The guest 373 * is required to use VCPUOP_register_vcpu_info to place vcpu info 374 * for secondary CPUs as they are brought up. 375 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. 376 */ 377 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info), 378 sizeof(struct vcpu_info)); 379 if (xen_vcpu_info == NULL) 380 return -ENOMEM; 381 382 /* Direct vCPU id mapping for ARM guests. */ 383 per_cpu(xen_vcpu_id, 0) = 0; 384 385 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames(); 386 if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn, 387 &xen_auto_xlat_grant_frames.vaddr, 388 xen_auto_xlat_grant_frames.count)) { 389 free_percpu(xen_vcpu_info); 390 return -ENOMEM; 391 } 392 gnttab_init(); 393 if (!xen_initial_domain()) 394 xenbus_probe(NULL); 395 396 /* 397 * Making sure board specific code will not set up ops for 398 * cpu idle and cpu freq. 399 */ 400 disable_cpuidle(); 401 disable_cpufreq(); 402 403 xen_init_IRQ(); 404 405 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 406 "events", &xen_vcpu)) { 407 pr_err("Error request IRQ %d\n", xen_events_irq); 408 return -EINVAL; 409 } 410 411 xen_time_setup_guest(); 412 413 if (xen_initial_domain()) 414 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier); 415 416 return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING, 417 "AP_ARM_XEN_STARTING", xen_starting_cpu, 418 xen_dying_cpu); 419 } 420 early_initcall(xen_guest_init); 421 422 static int __init xen_pm_init(void) 423 { 424 if (!xen_domain()) 425 return -ENODEV; 426 427 pm_power_off = xen_power_off; 428 arm_pm_restart = xen_restart; 429 if (!xen_initial_domain()) { 430 struct timespec64 ts; 431 xen_read_wallclock(&ts); 432 do_settimeofday64(&ts); 433 } 434 435 return 0; 436 } 437 late_initcall(xen_pm_init); 438 439 440 /* empty stubs */ 441 void xen_arch_pre_suspend(void) { } 442 void xen_arch_post_suspend(int suspend_cancelled) { } 443 void xen_timer_resume(void) { } 444 void xen_arch_resume(void) { } 445 void xen_arch_suspend(void) { } 446 447 448 /* In the hypercall.S file. */ 449 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 450 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 451 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 452 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 453 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 454 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 455 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 456 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 457 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); 458 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); 459 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op); 460 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); 461 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist); 462 EXPORT_SYMBOL_GPL(privcmd_call); 463