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