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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 | // SPDX-License-Identifier: GPL-2.0-only #include <xen/xen.h> #include <xen/events.h> #include <xen/grant_table.h> #include <xen/hvm.h> #include <xen/interface/vcpu.h> #include <xen/interface/xen.h> #include <xen/interface/memory.h> #include <xen/interface/hvm/params.h> #include <xen/features.h> #include <xen/platform_pci.h> #include <xen/xenbus.h> #include <xen/page.h> #include <xen/interface/sched.h> #include <xen/xen-ops.h> #include <asm/xen/hypervisor.h> #include <asm/xen/hypercall.h> #include <asm/system_misc.h> #include <asm/efi.h> #include <linux/interrupt.h> #include <linux/irqreturn.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_fdt.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/cpuidle.h> #include <linux/cpufreq.h> #include <linux/cpu.h> #include <linux/console.h> #include <linux/pvclock_gtod.h> #include <linux/reboot.h> #include <linux/time64.h> #include <linux/timekeeping.h> #include <linux/timekeeper_internal.h> #include <linux/acpi.h> #include <linux/virtio_anchor.h> #include <linux/mm.h> static struct start_info _xen_start_info; struct start_info *xen_start_info = &_xen_start_info; EXPORT_SYMBOL(xen_start_info); enum xen_domain_type xen_domain_type = XEN_NATIVE; EXPORT_SYMBOL(xen_domain_type); struct shared_info xen_dummy_shared_info; struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); static struct vcpu_info __percpu *xen_vcpu_info; /* Linux <-> Xen vCPU id mapping */ DEFINE_PER_CPU(uint32_t, xen_vcpu_id); EXPORT_PER_CPU_SYMBOL(xen_vcpu_id); /* These are unused until we support booting "pre-ballooned" */ unsigned long xen_released_pages; struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; static __read_mostly unsigned int xen_events_irq; static __read_mostly phys_addr_t xen_grant_frames; #define GRANT_TABLE_INDEX 0 #define EXT_REGION_INDEX 1 uint32_t xen_start_flags; EXPORT_SYMBOL(xen_start_flags); int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, int nr, struct page **pages) { return xen_xlate_unmap_gfn_range(vma, nr, pages); } EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); static void xen_read_wallclock(struct timespec64 *ts) { u32 version; struct timespec64 now, ts_monotonic; struct shared_info *s = HYPERVISOR_shared_info; struct pvclock_wall_clock *wall_clock = &(s->wc); /* get wallclock at system boot */ do { version = wall_clock->version; rmb(); /* fetch version before time */ now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec; now.tv_nsec = wall_clock->nsec; rmb(); /* fetch time before checking version */ } while ((wall_clock->version & 1) || (version != wall_clock->version)); /* time since system boot */ ktime_get_ts64(&ts_monotonic); *ts = timespec64_add(now, ts_monotonic); } static int xen_pvclock_gtod_notify(struct notifier_block *nb, unsigned long was_set, void *priv) { /* Protected by the calling core code serialization */ static struct timespec64 next_sync; struct xen_platform_op op; struct timespec64 now, system_time; struct timekeeper *tk = priv; now.tv_sec = tk->xtime_sec; now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); system_time = timespec64_add(now, tk->wall_to_monotonic); /* * We only take the expensive HV call when the clock was set * or when the 11 minutes RTC synchronization time elapsed. */ if (!was_set && timespec64_compare(&now, &next_sync) < 0) return NOTIFY_OK; op.cmd = XENPF_settime64; op.u.settime64.mbz = 0; op.u.settime64.secs = now.tv_sec; op.u.settime64.nsecs = now.tv_nsec; op.u.settime64.system_time = timespec64_to_ns(&system_time); (void)HYPERVISOR_platform_op(&op); /* * Move the next drift compensation time 11 minutes * ahead. That's emulating the sync_cmos_clock() update for * the hardware RTC. */ next_sync = now; next_sync.tv_sec += 11 * 60; return NOTIFY_OK; } static struct notifier_block xen_pvclock_gtod_notifier = { .notifier_call = xen_pvclock_gtod_notify, }; static int xen_starting_cpu(unsigned int cpu) { struct vcpu_register_vcpu_info info; struct vcpu_info *vcpup; int err; /* * VCPUOP_register_vcpu_info cannot be called twice for the same * vcpu, so if vcpu_info is already registered, just get out. This * can happen with cpu-hotplug. */ if (per_cpu(xen_vcpu, cpu) != NULL) goto after_register_vcpu_info; pr_info("Xen: initializing cpu%d\n", cpu); vcpup = per_cpu_ptr(xen_vcpu_info, cpu); info.mfn = percpu_to_gfn(vcpup); info.offset = xen_offset_in_page(vcpup); err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu), &info); BUG_ON(err); per_cpu(xen_vcpu, cpu) = vcpup; if (!xen_kernel_unmapped_at_usr()) xen_setup_runstate_info(cpu); after_register_vcpu_info: enable_percpu_irq(xen_events_irq, 0); return 0; } static int xen_dying_cpu(unsigned int cpu) { disable_percpu_irq(xen_events_irq); return 0; } void xen_reboot(int reason) { struct sched_shutdown r = { .reason = reason }; int rc; rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); BUG_ON(rc); } static int xen_restart(struct notifier_block *nb, unsigned long action, void *data) { xen_reboot(SHUTDOWN_reboot); return NOTIFY_DONE; } static struct notifier_block xen_restart_nb = { .notifier_call = xen_restart, .priority = 192, }; static void xen_power_off(void) { xen_reboot(SHUTDOWN_poweroff); } static irqreturn_t xen_arm_callback(int irq, void *arg) { xen_hvm_evtchn_do_upcall(); return IRQ_HANDLED; } static __initdata struct { const char *compat; const char *prefix; const char *version; bool found; } hyper_node = {"xen,xen", "xen,xen-", NULL, false}; static int __init fdt_find_hyper_node(unsigned long node, const char *uname, int depth, void *data) { const void *s = NULL; int len; if (depth != 1 || strcmp(uname, "hypervisor") != 0) return 0; if (of_flat_dt_is_compatible(node, hyper_node.compat)) hyper_node.found = true; s = of_get_flat_dt_prop(node, "compatible", &len); if (strlen(hyper_node.prefix) + 3 < len && !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) hyper_node.version = s + strlen(hyper_node.prefix); /* * Check if Xen supports EFI by checking whether there is the * "/hypervisor/uefi" node in DT. If so, runtime services are available * through proxy functions (e.g. in case of Xen dom0 EFI implementation * they call special hypercall which executes relevant EFI functions) * and that is why they are always enabled. */ if (IS_ENABLED(CONFIG_XEN_EFI)) { if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) && !efi_runtime_disabled()) set_bit(EFI_RUNTIME_SERVICES, &efi.flags); } return 0; } /* * see Documentation/devicetree/bindings/arm/xen.txt for the * documentation of the Xen Device Tree format. */ void __init xen_early_init(void) { of_scan_flat_dt(fdt_find_hyper_node, NULL); if (!hyper_node.found) { pr_debug("No Xen support\n"); return; } if (hyper_node.version == NULL) { pr_debug("Xen version not found\n"); return; } pr_info("Xen %s support found\n", hyper_node.version); xen_domain_type = XEN_HVM_DOMAIN; xen_setup_features(); if (xen_feature(XENFEAT_dom0)) xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; if (!console_set_on_cmdline && !xen_initial_domain()) add_preferred_console("hvc", 0, NULL); } static void __init xen_acpi_guest_init(void) { #ifdef CONFIG_ACPI struct xen_hvm_param a; int interrupt, trigger, polarity; a.domid = DOMID_SELF; a.index = HVM_PARAM_CALLBACK_IRQ; if (HYPERVISOR_hvm_op(HVMOP_get_param, &a) || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) { xen_events_irq = 0; return; } interrupt = a.value & 0xff; trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity); #endif } #ifdef CONFIG_XEN_UNPOPULATED_ALLOC /* * A type-less specific Xen resource which contains extended regions * (unused regions of guest physical address space provided by the hypervisor). */ static struct resource xen_resource = { .name = "Xen unused space", }; int __init arch_xen_unpopulated_init(struct resource **res) { struct device_node *np; struct resource *regs, *tmp_res; uint64_t min_gpaddr = -1, max_gpaddr = 0; unsigned int i, nr_reg = 0; int rc; if (!xen_domain()) return -ENODEV; if (!acpi_disabled) return -ENODEV; np = of_find_compatible_node(NULL, NULL, "xen,xen"); if (WARN_ON(!np)) return -ENODEV; /* Skip region 0 which is reserved for grant table space */ while (of_get_address(np, nr_reg + EXT_REGION_INDEX, NULL, NULL)) nr_reg++; if (!nr_reg) { pr_err("No extended regions are found\n"); of_node_put(np); return -EINVAL; } regs = kcalloc(nr_reg, sizeof(*regs), GFP_KERNEL); if (!regs) { of_node_put(np); return -ENOMEM; } /* * Create resource from extended regions provided by the hypervisor to be * used as unused address space for Xen scratch pages. */ for (i = 0; i < nr_reg; i++) { rc = of_address_to_resource(np, i + EXT_REGION_INDEX, ®s[i]); if (rc) goto err; if (max_gpaddr < regs[i].end) max_gpaddr = regs[i].end; if (min_gpaddr > regs[i].start) min_gpaddr = regs[i].start; } xen_resource.start = min_gpaddr; xen_resource.end = max_gpaddr; /* * Mark holes between extended regions as unavailable. The rest of that * address space will be available for the allocation. */ for (i = 1; i < nr_reg; i++) { resource_size_t start, end; /* There is an overlap between regions */ if (regs[i - 1].end + 1 > regs[i].start) { rc = -EINVAL; goto err; } /* There is no hole between regions */ if (regs[i - 1].end + 1 == regs[i].start) continue; start = regs[i - 1].end + 1; end = regs[i].start - 1; tmp_res = kzalloc(sizeof(*tmp_res), GFP_KERNEL); if (!tmp_res) { rc = -ENOMEM; goto err; } tmp_res->name = "Unavailable space"; tmp_res->start = start; tmp_res->end = end; rc = insert_resource(&xen_resource, tmp_res); if (rc) { pr_err("Cannot insert resource %pR (%d)\n", tmp_res, rc); kfree(tmp_res); goto err; } } *res = &xen_resource; err: of_node_put(np); kfree(regs); return rc; } #endif static void __init xen_dt_guest_init(void) { struct device_node *xen_node; struct resource res; xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); if (!xen_node) { pr_err("Xen support was detected before, but it has disappeared\n"); return; } xen_events_irq = irq_of_parse_and_map(xen_node, 0); if (of_address_to_resource(xen_node, GRANT_TABLE_INDEX, &res)) { pr_err("Xen grant table region is not found\n"); of_node_put(xen_node); return; } of_node_put(xen_node); xen_grant_frames = res.start; } static int __init xen_guest_init(void) { struct xen_add_to_physmap xatp; struct shared_info *shared_info_page = NULL; int rc, cpu; if (!xen_domain()) return 0; if (IS_ENABLED(CONFIG_XEN_VIRTIO)) virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc); if (!acpi_disabled) xen_acpi_guest_init(); else xen_dt_guest_init(); if (!xen_events_irq) { pr_err("Xen event channel interrupt not found\n"); return -ENODEV; } /* * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI * parameters are found. Force enable runtime services. */ if (efi_enabled(EFI_RUNTIME_SERVICES)) xen_efi_runtime_setup(); shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); if (!shared_info_page) { pr_err("not enough memory\n"); return -ENOMEM; } xatp.domid = DOMID_SELF; xatp.idx = 0; xatp.space = XENMAPSPACE_shared_info; xatp.gpfn = virt_to_gfn(shared_info_page); if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) BUG(); HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info * page, we use it in the event channel upcall and in some pvclock * related functions. * The shared info contains exactly 1 CPU (the boot CPU). The guest * is required to use VCPUOP_register_vcpu_info to place vcpu info * for secondary CPUs as they are brought up. * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. */ xen_vcpu_info = alloc_percpu(struct vcpu_info); if (xen_vcpu_info == NULL) return -ENOMEM; /* Direct vCPU id mapping for ARM guests. */ for_each_possible_cpu(cpu) per_cpu(xen_vcpu_id, cpu) = cpu; if (!xen_grant_frames) { xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames(); rc = xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn, &xen_auto_xlat_grant_frames.vaddr, xen_auto_xlat_grant_frames.count); } else rc = gnttab_setup_auto_xlat_frames(xen_grant_frames); if (rc) { free_percpu(xen_vcpu_info); return rc; } gnttab_init(); /* * Making sure board specific code will not set up ops for * cpu idle and cpu freq. */ disable_cpuidle(); disable_cpufreq(); xen_init_IRQ(); if (request_percpu_irq(xen_events_irq, xen_arm_callback, "events", &xen_vcpu)) { pr_err("Error request IRQ %d\n", xen_events_irq); return -EINVAL; } if (!xen_kernel_unmapped_at_usr()) xen_time_setup_guest(); if (xen_initial_domain()) pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier); return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING, "arm/xen:starting", xen_starting_cpu, xen_dying_cpu); } early_initcall(xen_guest_init); static int __init xen_pm_init(void) { if (!xen_domain()) return -ENODEV; pm_power_off = xen_power_off; register_restart_handler(&xen_restart_nb); if (!xen_initial_domain()) { struct timespec64 ts; xen_read_wallclock(&ts); do_settimeofday64(&ts); } return 0; } late_initcall(xen_pm_init); /* empty stubs */ void xen_arch_pre_suspend(void) { } void xen_arch_post_suspend(int suspend_cancelled) { } void xen_timer_resume(void) { } void xen_arch_resume(void) { } void xen_arch_suspend(void) { } /* In the hypercall.S file. */ EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw); EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist); EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op); EXPORT_SYMBOL_GPL(privcmd_call); |