1 /* 2 * QEMU KVM support 3 * 4 * Copyright IBM, Corp. 2008 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 * 12 */ 13 14 #ifndef QEMU_KVM_H 15 #define QEMU_KVM_H 16 17 #include "qemu/queue.h" 18 #include "qom/cpu.h" 19 #include "exec/memattrs.h" 20 #include "hw/irq.h" 21 22 #ifdef CONFIG_KVM 23 #include <linux/kvm.h> 24 #include <linux/kvm_para.h> 25 #else 26 /* These constants must never be used at runtime if kvm_enabled() is false. 27 * They exist so we don't need #ifdefs around KVM-specific code that already 28 * checks kvm_enabled() properly. 29 */ 30 #define KVM_CPUID_SIGNATURE 0 31 #define KVM_CPUID_FEATURES 0 32 #define KVM_FEATURE_CLOCKSOURCE 0 33 #define KVM_FEATURE_NOP_IO_DELAY 0 34 #define KVM_FEATURE_MMU_OP 0 35 #define KVM_FEATURE_CLOCKSOURCE2 0 36 #define KVM_FEATURE_ASYNC_PF 0 37 #define KVM_FEATURE_STEAL_TIME 0 38 #define KVM_FEATURE_PV_EOI 0 39 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 0 40 #endif 41 42 extern bool kvm_allowed; 43 extern bool kvm_kernel_irqchip; 44 extern bool kvm_split_irqchip; 45 extern bool kvm_async_interrupts_allowed; 46 extern bool kvm_halt_in_kernel_allowed; 47 extern bool kvm_eventfds_allowed; 48 extern bool kvm_irqfds_allowed; 49 extern bool kvm_resamplefds_allowed; 50 extern bool kvm_msi_via_irqfd_allowed; 51 extern bool kvm_gsi_routing_allowed; 52 extern bool kvm_gsi_direct_mapping; 53 extern bool kvm_readonly_mem_allowed; 54 extern bool kvm_direct_msi_allowed; 55 extern bool kvm_ioeventfd_any_length_allowed; 56 57 #if defined CONFIG_KVM || !defined NEED_CPU_H 58 #define kvm_enabled() (kvm_allowed) 59 /** 60 * kvm_irqchip_in_kernel: 61 * 62 * Returns: true if the user asked us to create an in-kernel 63 * irqchip via the "kernel_irqchip=on" machine option. 64 * What this actually means is architecture and machine model 65 * specific: on PC, for instance, it means that the LAPIC, 66 * IOAPIC and PIT are all in kernel. This function should never 67 * be used from generic target-independent code: use one of the 68 * following functions or some other specific check instead. 69 */ 70 #define kvm_irqchip_in_kernel() (kvm_kernel_irqchip) 71 72 /** 73 * kvm_irqchip_is_split: 74 * 75 * Returns: true if the user asked us to split the irqchip 76 * implementation between user and kernel space. The details are 77 * architecture and machine specific. On PC, it means that the PIC, 78 * IOAPIC, and PIT are in user space while the LAPIC is in the kernel. 79 */ 80 #define kvm_irqchip_is_split() (kvm_split_irqchip) 81 82 /** 83 * kvm_async_interrupts_enabled: 84 * 85 * Returns: true if we can deliver interrupts to KVM 86 * asynchronously (ie by ioctl from any thread at any time) 87 * rather than having to do interrupt delivery synchronously 88 * (where the vcpu must be stopped at a suitable point first). 89 */ 90 #define kvm_async_interrupts_enabled() (kvm_async_interrupts_allowed) 91 92 /** 93 * kvm_halt_in_kernel 94 * 95 * Returns: true if halted cpus should still get a KVM_RUN ioctl to run 96 * inside of kernel space. This only works if MP state is implemented. 97 */ 98 #define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed) 99 100 /** 101 * kvm_eventfds_enabled: 102 * 103 * Returns: true if we can use eventfds to receive notifications 104 * from a KVM CPU (ie the kernel supports eventds and we are running 105 * with a configuration where it is meaningful to use them). 106 */ 107 #define kvm_eventfds_enabled() (kvm_eventfds_allowed) 108 109 /** 110 * kvm_irqfds_enabled: 111 * 112 * Returns: true if we can use irqfds to inject interrupts into 113 * a KVM CPU (ie the kernel supports irqfds and we are running 114 * with a configuration where it is meaningful to use them). 115 */ 116 #define kvm_irqfds_enabled() (kvm_irqfds_allowed) 117 118 /** 119 * kvm_resamplefds_enabled: 120 * 121 * Returns: true if we can use resamplefds to inject interrupts into 122 * a KVM CPU (ie the kernel supports resamplefds and we are running 123 * with a configuration where it is meaningful to use them). 124 */ 125 #define kvm_resamplefds_enabled() (kvm_resamplefds_allowed) 126 127 /** 128 * kvm_msi_via_irqfd_enabled: 129 * 130 * Returns: true if we can route a PCI MSI (Message Signaled Interrupt) 131 * to a KVM CPU via an irqfd. This requires that the kernel supports 132 * this and that we're running in a configuration that permits it. 133 */ 134 #define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed) 135 136 /** 137 * kvm_gsi_routing_enabled: 138 * 139 * Returns: true if GSI routing is enabled (ie the kernel supports 140 * it and we're running in a configuration that permits it). 141 */ 142 #define kvm_gsi_routing_enabled() (kvm_gsi_routing_allowed) 143 144 /** 145 * kvm_gsi_direct_mapping: 146 * 147 * Returns: true if GSI direct mapping is enabled. 148 */ 149 #define kvm_gsi_direct_mapping() (kvm_gsi_direct_mapping) 150 151 /** 152 * kvm_readonly_mem_enabled: 153 * 154 * Returns: true if KVM readonly memory is enabled (ie the kernel 155 * supports it and we're running in a configuration that permits it). 156 */ 157 #define kvm_readonly_mem_enabled() (kvm_readonly_mem_allowed) 158 159 /** 160 * kvm_direct_msi_enabled: 161 * 162 * Returns: true if KVM allows direct MSI injection. 163 */ 164 #define kvm_direct_msi_enabled() (kvm_direct_msi_allowed) 165 166 /** 167 * kvm_ioeventfd_any_length_enabled: 168 * Returns: true if KVM allows any length io eventfd. 169 */ 170 #define kvm_ioeventfd_any_length_enabled() (kvm_ioeventfd_any_length_allowed) 171 172 #else 173 #define kvm_enabled() (0) 174 #define kvm_irqchip_in_kernel() (false) 175 #define kvm_irqchip_is_split() (false) 176 #define kvm_async_interrupts_enabled() (false) 177 #define kvm_halt_in_kernel() (false) 178 #define kvm_eventfds_enabled() (false) 179 #define kvm_irqfds_enabled() (false) 180 #define kvm_resamplefds_enabled() (false) 181 #define kvm_msi_via_irqfd_enabled() (false) 182 #define kvm_gsi_routing_allowed() (false) 183 #define kvm_gsi_direct_mapping() (false) 184 #define kvm_readonly_mem_enabled() (false) 185 #define kvm_direct_msi_enabled() (false) 186 #define kvm_ioeventfd_any_length_enabled() (false) 187 #endif 188 189 struct kvm_run; 190 struct kvm_lapic_state; 191 struct kvm_irq_routing_entry; 192 193 typedef struct KVMCapabilityInfo { 194 const char *name; 195 int value; 196 } KVMCapabilityInfo; 197 198 #define KVM_CAP_INFO(CAP) { "KVM_CAP_" stringify(CAP), KVM_CAP_##CAP } 199 #define KVM_CAP_LAST_INFO { NULL, 0 } 200 201 struct KVMState; 202 typedef struct KVMState KVMState; 203 extern KVMState *kvm_state; 204 205 /* external API */ 206 207 bool kvm_has_free_slot(MachineState *ms); 208 int kvm_has_sync_mmu(void); 209 int kvm_has_vcpu_events(void); 210 int kvm_has_robust_singlestep(void); 211 int kvm_has_debugregs(void); 212 int kvm_has_pit_state2(void); 213 int kvm_has_many_ioeventfds(void); 214 int kvm_has_gsi_routing(void); 215 int kvm_has_intx_set_mask(void); 216 217 int kvm_init_vcpu(CPUState *cpu); 218 int kvm_cpu_exec(CPUState *cpu); 219 int kvm_destroy_vcpu(CPUState *cpu); 220 221 #ifdef NEED_CPU_H 222 #include "cpu.h" 223 224 void kvm_setup_guest_memory(void *start, size_t size); 225 void kvm_flush_coalesced_mmio_buffer(void); 226 227 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr, 228 target_ulong len, int type); 229 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr, 230 target_ulong len, int type); 231 void kvm_remove_all_breakpoints(CPUState *cpu); 232 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap); 233 #ifndef _WIN32 234 int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset); 235 #endif 236 237 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr); 238 int kvm_on_sigbus(int code, void *addr); 239 240 /* interface with exec.c */ 241 242 void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align)); 243 244 /* internal API */ 245 246 int kvm_ioctl(KVMState *s, int type, ...); 247 248 int kvm_vm_ioctl(KVMState *s, int type, ...); 249 250 int kvm_vcpu_ioctl(CPUState *cpu, int type, ...); 251 252 /** 253 * kvm_device_ioctl - call an ioctl on a kvm device 254 * @fd: The KVM device file descriptor as returned from KVM_CREATE_DEVICE 255 * @type: The device-ctrl ioctl number 256 * 257 * Returns: -errno on error, nonnegative on success 258 */ 259 int kvm_device_ioctl(int fd, int type, ...); 260 261 /** 262 * kvm_vm_check_attr - check for existence of a specific vm attribute 263 * @s: The KVMState pointer 264 * @group: the group 265 * @attr: the attribute of that group to query for 266 * 267 * Returns: 1 if the attribute exists 268 * 0 if the attribute either does not exist or if the vm device 269 * interface is unavailable 270 */ 271 int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr); 272 273 /** 274 * kvm_device_check_attr - check for existence of a specific device attribute 275 * @fd: The device file descriptor 276 * @group: the group 277 * @attr: the attribute of that group to query for 278 * 279 * Returns: 1 if the attribute exists 280 * 0 if the attribute either does not exist or if the vm device 281 * interface is unavailable 282 */ 283 int kvm_device_check_attr(int fd, uint32_t group, uint64_t attr); 284 285 /** 286 * kvm_device_access - set or get value of a specific vm attribute 287 * @fd: The device file descriptor 288 * @group: the group 289 * @attr: the attribute of that group to set or get 290 * @val: pointer to a storage area for the value 291 * @write: true for set and false for get operation 292 * 293 * This function is not allowed to fail. Use kvm_device_check_attr() 294 * in order to check for the availability of optional attributes. 295 */ 296 void kvm_device_access(int fd, int group, uint64_t attr, 297 void *val, bool write); 298 299 /** 300 * kvm_create_device - create a KVM device for the device control API 301 * @KVMState: The KVMState pointer 302 * @type: The KVM device type (see Documentation/virtual/kvm/devices in the 303 * kernel source) 304 * @test: If true, only test if device can be created, but don't actually 305 * create the device. 306 * 307 * Returns: -errno on error, nonnegative on success: @test ? 0 : device fd; 308 */ 309 int kvm_create_device(KVMState *s, uint64_t type, bool test); 310 311 /** 312 * kvm_device_supported - probe whether KVM supports specific device 313 * 314 * @vmfd: The fd handler for VM 315 * @type: type of device 316 * 317 * @return: true if supported, otherwise false. 318 */ 319 bool kvm_device_supported(int vmfd, uint64_t type); 320 321 /* Arch specific hooks */ 322 323 extern const KVMCapabilityInfo kvm_arch_required_capabilities[]; 324 325 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run); 326 MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run); 327 328 int kvm_arch_handle_exit(CPUState *cpu, struct kvm_run *run); 329 330 int kvm_arch_handle_ioapic_eoi(CPUState *cpu, struct kvm_run *run); 331 332 int kvm_arch_process_async_events(CPUState *cpu); 333 334 int kvm_arch_get_registers(CPUState *cpu); 335 336 /* state subset only touched by the VCPU itself during runtime */ 337 #define KVM_PUT_RUNTIME_STATE 1 338 /* state subset modified during VCPU reset */ 339 #define KVM_PUT_RESET_STATE 2 340 /* full state set, modified during initialization or on vmload */ 341 #define KVM_PUT_FULL_STATE 3 342 343 int kvm_arch_put_registers(CPUState *cpu, int level); 344 345 int kvm_arch_init(MachineState *ms, KVMState *s); 346 347 int kvm_arch_init_vcpu(CPUState *cpu); 348 349 bool kvm_vcpu_id_is_valid(int vcpu_id); 350 351 /* Returns VCPU ID to be used on KVM_CREATE_VCPU ioctl() */ 352 unsigned long kvm_arch_vcpu_id(CPUState *cpu); 353 354 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr); 355 int kvm_arch_on_sigbus(int code, void *addr); 356 357 void kvm_arch_init_irq_routing(KVMState *s); 358 359 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route, 360 uint64_t address, uint32_t data, PCIDevice *dev); 361 362 int kvm_arch_msi_data_to_gsi(uint32_t data); 363 364 int kvm_set_irq(KVMState *s, int irq, int level); 365 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg); 366 367 void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin); 368 void kvm_irqchip_commit_routes(KVMState *s); 369 370 void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic); 371 void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic); 372 373 struct kvm_guest_debug; 374 struct kvm_debug_exit_arch; 375 376 struct kvm_sw_breakpoint { 377 target_ulong pc; 378 target_ulong saved_insn; 379 int use_count; 380 QTAILQ_ENTRY(kvm_sw_breakpoint) entry; 381 }; 382 383 QTAILQ_HEAD(kvm_sw_breakpoint_head, kvm_sw_breakpoint); 384 385 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu, 386 target_ulong pc); 387 388 int kvm_sw_breakpoints_active(CPUState *cpu); 389 390 int kvm_arch_insert_sw_breakpoint(CPUState *cpu, 391 struct kvm_sw_breakpoint *bp); 392 int kvm_arch_remove_sw_breakpoint(CPUState *cpu, 393 struct kvm_sw_breakpoint *bp); 394 int kvm_arch_insert_hw_breakpoint(target_ulong addr, 395 target_ulong len, int type); 396 int kvm_arch_remove_hw_breakpoint(target_ulong addr, 397 target_ulong len, int type); 398 void kvm_arch_remove_all_hw_breakpoints(void); 399 400 void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg); 401 402 bool kvm_arch_stop_on_emulation_error(CPUState *cpu); 403 404 int kvm_check_extension(KVMState *s, unsigned int extension); 405 406 int kvm_vm_check_extension(KVMState *s, unsigned int extension); 407 408 #define kvm_vm_enable_cap(s, capability, cap_flags, ...) \ 409 ({ \ 410 struct kvm_enable_cap cap = { \ 411 .cap = capability, \ 412 .flags = cap_flags, \ 413 }; \ 414 uint64_t args_tmp[] = { __VA_ARGS__ }; \ 415 int i; \ 416 for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \ 417 i < ARRAY_SIZE(cap.args); i++) { \ 418 cap.args[i] = args_tmp[i]; \ 419 } \ 420 kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap); \ 421 }) 422 423 #define kvm_vcpu_enable_cap(cpu, capability, cap_flags, ...) \ 424 ({ \ 425 struct kvm_enable_cap cap = { \ 426 .cap = capability, \ 427 .flags = cap_flags, \ 428 }; \ 429 uint64_t args_tmp[] = { __VA_ARGS__ }; \ 430 int i; \ 431 for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \ 432 i < ARRAY_SIZE(cap.args); i++) { \ 433 cap.args[i] = args_tmp[i]; \ 434 } \ 435 kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap); \ 436 }) 437 438 uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function, 439 uint32_t index, int reg); 440 441 void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len); 442 443 #if !defined(CONFIG_USER_ONLY) 444 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr, 445 hwaddr *phys_addr); 446 #endif 447 448 #endif /* NEED_CPU_H */ 449 450 void kvm_cpu_synchronize_state(CPUState *cpu); 451 void kvm_cpu_synchronize_post_reset(CPUState *cpu); 452 void kvm_cpu_synchronize_post_init(CPUState *cpu); 453 454 /* generic hooks - to be moved/refactored once there are more users */ 455 456 static inline void cpu_synchronize_state(CPUState *cpu) 457 { 458 if (kvm_enabled()) { 459 kvm_cpu_synchronize_state(cpu); 460 } 461 } 462 463 static inline void cpu_synchronize_post_reset(CPUState *cpu) 464 { 465 if (kvm_enabled()) { 466 kvm_cpu_synchronize_post_reset(cpu); 467 } 468 } 469 470 static inline void cpu_synchronize_post_init(CPUState *cpu) 471 { 472 if (kvm_enabled()) { 473 kvm_cpu_synchronize_post_init(cpu); 474 } 475 } 476 477 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg, PCIDevice *dev); 478 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg, 479 PCIDevice *dev); 480 void kvm_irqchip_release_virq(KVMState *s, int virq); 481 482 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter); 483 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint); 484 485 int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, 486 EventNotifier *rn, int virq); 487 int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, 488 int virq); 489 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, 490 EventNotifier *rn, qemu_irq irq); 491 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, 492 qemu_irq irq); 493 void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi); 494 void kvm_pc_gsi_handler(void *opaque, int n, int level); 495 void kvm_pc_setup_irq_routing(bool pci_enabled); 496 void kvm_init_irq_routing(KVMState *s); 497 498 /** 499 * kvm_arch_irqchip_create: 500 * @KVMState: The KVMState pointer 501 * @MachineState: The MachineState pointer 502 * 503 * Allow architectures to create an in-kernel irq chip themselves. 504 * 505 * Returns: < 0: error 506 * 0: irq chip was not created 507 * > 0: irq chip was created 508 */ 509 int kvm_arch_irqchip_create(MachineState *ms, KVMState *s); 510 511 /** 512 * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl 513 * @id: The register ID 514 * @source: The pointer to the value to be set. It must point to a variable 515 * of the correct type/size for the register being accessed. 516 * 517 * Returns: 0 on success, or a negative errno on failure. 518 */ 519 int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source); 520 521 /** 522 * kvm_get_one_reg - get a register value from KVM via KVM_GET_ONE_REG ioctl 523 * @id: The register ID 524 * @target: The pointer where the value is to be stored. It must point to a 525 * variable of the correct type/size for the register being accessed. 526 * 527 * Returns: 0 on success, or a negative errno on failure. 528 */ 529 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target); 530 int kvm_get_max_memslots(void); 531 #endif 532