include/sysemu/kvm.h

   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 NEED_CPU_H
  23 # ifdef CONFIG_KVM
  24 #  include <linux/kvm.h>
  25 #  define CONFIG_KVM_IS_POSSIBLE
  26 # endif
  27 #else
  28 # define CONFIG_KVM_IS_POSSIBLE
  29 #endif
  30
  31 #ifdef CONFIG_KVM_IS_POSSIBLE
  32
  33 extern bool kvm_allowed;
  34 extern bool kvm_kernel_irqchip;
  35 extern bool kvm_split_irqchip;
  36 extern bool kvm_async_interrupts_allowed;
  37 extern bool kvm_halt_in_kernel_allowed;
  38 extern bool kvm_eventfds_allowed;
  39 extern bool kvm_irqfds_allowed;
  40 extern bool kvm_resamplefds_allowed;
  41 extern bool kvm_msi_via_irqfd_allowed;
  42 extern bool kvm_gsi_routing_allowed;
  43 extern bool kvm_gsi_direct_mapping;
  44 extern bool kvm_readonly_mem_allowed;
  45 extern bool kvm_direct_msi_allowed;
  46 extern bool kvm_ioeventfd_any_length_allowed;
  47 extern bool kvm_msi_use_devid;
  48
  49 #define kvm_enabled()           (kvm_allowed)
  50 /**
  51  * kvm_irqchip_in_kernel:
  52  *
  53  * Returns: true if the user asked us to create an in-kernel
  54  * irqchip via the "kernel_irqchip=on" machine option.
  55  * What this actually means is architecture and machine model
  56  * specific: on PC, for instance, it means that the LAPIC,
  57  * IOAPIC and PIT are all in kernel. This function should never
  58  * be used from generic target-independent code: use one of the
  59  * following functions or some other specific check instead.
  60  */
  61 #define kvm_irqchip_in_kernel() (kvm_kernel_irqchip)
  62
  63 /**
  64  * kvm_irqchip_is_split:
  65  *
  66  * Returns: true if the user asked us to split the irqchip
  67  * implementation between user and kernel space. The details are
  68  * architecture and machine specific. On PC, it means that the PIC,
  69  * IOAPIC, and PIT are in user space while the LAPIC is in the kernel.
  70  */
  71 #define kvm_irqchip_is_split() (kvm_split_irqchip)
  72
  73 /**
  74  * kvm_async_interrupts_enabled:
  75  *
  76  * Returns: true if we can deliver interrupts to KVM
  77  * asynchronously (ie by ioctl from any thread at any time)
  78  * rather than having to do interrupt delivery synchronously
  79  * (where the vcpu must be stopped at a suitable point first).
  80  */
  81 #define kvm_async_interrupts_enabled() (kvm_async_interrupts_allowed)
  82
  83 /**
  84  * kvm_halt_in_kernel
  85  *
  86  * Returns: true if halted cpus should still get a KVM_RUN ioctl to run
  87  * inside of kernel space. This only works if MP state is implemented.
  88  */
  89 #define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed)
  90
  91 /**
  92  * kvm_eventfds_enabled:
  93  *
  94  * Returns: true if we can use eventfds to receive notifications
  95  * from a KVM CPU (ie the kernel supports eventds and we are running
  96  * with a configuration where it is meaningful to use them).
  97  */
  98 #define kvm_eventfds_enabled() (kvm_eventfds_allowed)
  99
 100 /**
 101  * kvm_irqfds_enabled:
 102  *
 103  * Returns: true if we can use irqfds to inject interrupts into
 104  * a KVM CPU (ie the kernel supports irqfds and we are running
 105  * with a configuration where it is meaningful to use them).
 106  */
 107 #define kvm_irqfds_enabled() (kvm_irqfds_allowed)
 108
 109 /**
 110  * kvm_resamplefds_enabled:
 111  *
 112  * Returns: true if we can use resamplefds to inject interrupts into
 113  * a KVM CPU (ie the kernel supports resamplefds and we are running
 114  * with a configuration where it is meaningful to use them).
 115  */
 116 #define kvm_resamplefds_enabled() (kvm_resamplefds_allowed)
 117
 118 /**
 119  * kvm_msi_via_irqfd_enabled:
 120  *
 121  * Returns: true if we can route a PCI MSI (Message Signaled Interrupt)
 122  * to a KVM CPU via an irqfd. This requires that the kernel supports
 123  * this and that we're running in a configuration that permits it.
 124  */
 125 #define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed)
 126
 127 /**
 128  * kvm_gsi_routing_enabled:
 129  *
 130  * Returns: true if GSI routing is enabled (ie the kernel supports
 131  * it and we're running in a configuration that permits it).
 132  */
 133 #define kvm_gsi_routing_enabled() (kvm_gsi_routing_allowed)
 134
 135 /**
 136  * kvm_gsi_direct_mapping:
 137  *
 138  * Returns: true if GSI direct mapping is enabled.
 139  */
 140 #define kvm_gsi_direct_mapping() (kvm_gsi_direct_mapping)
 141
 142 /**
 143  * kvm_readonly_mem_enabled:
 144  *
 145  * Returns: true if KVM readonly memory is enabled (ie the kernel
 146  * supports it and we're running in a configuration that permits it).
 147  */
 148 #define kvm_readonly_mem_enabled() (kvm_readonly_mem_allowed)
 149
 150 /**
 151  * kvm_direct_msi_enabled:
 152  *
 153  * Returns: true if KVM allows direct MSI injection.
 154  */
 155 #define kvm_direct_msi_enabled() (kvm_direct_msi_allowed)
 156
 157 /**
 158  * kvm_ioeventfd_any_length_enabled:
 159  * Returns: true if KVM allows any length io eventfd.
 160  */
 161 #define kvm_ioeventfd_any_length_enabled() (kvm_ioeventfd_any_length_allowed)
 162
 163 /**
 164  * kvm_msi_devid_required:
 165  * Returns: true if KVM requires a device id to be provided while
 166  * defining an MSI routing entry.
 167  */
 168 #define kvm_msi_devid_required() (kvm_msi_use_devid)
 169
 170 #else
 171
 172 #define kvm_enabled()           (0)
 173 #define kvm_irqchip_in_kernel() (false)
 174 #define kvm_irqchip_is_split() (false)
 175 #define kvm_async_interrupts_enabled() (false)
 176 #define kvm_halt_in_kernel() (false)
 177 #define kvm_eventfds_enabled() (false)
 178 #define kvm_irqfds_enabled() (false)
 179 #define kvm_resamplefds_enabled() (false)
 180 #define kvm_msi_via_irqfd_enabled() (false)
 181 #define kvm_gsi_routing_allowed() (false)
 182 #define kvm_gsi_direct_mapping() (false)
 183 #define kvm_readonly_mem_enabled() (false)
 184 #define kvm_direct_msi_enabled() (false)
 185 #define kvm_ioeventfd_any_length_enabled() (false)
 186 #define kvm_msi_devid_required() (false)
 187
 188 #endif  /* CONFIG_KVM_IS_POSSIBLE */
 189
 190 struct kvm_run;
 191 struct kvm_lapic_state;
 192 struct kvm_irq_routing_entry;
 193
 194 typedef struct KVMCapabilityInfo {
 195     const char *name;
 196     int value;
 197 } KVMCapabilityInfo;
 198
 199 #define KVM_CAP_INFO(CAP) { "KVM_CAP_" stringify(CAP), KVM_CAP_##CAP }
 200 #define KVM_CAP_LAST_INFO { NULL, 0 }
 201
 202 struct KVMState;
 203 typedef struct KVMState KVMState;
 204 extern KVMState *kvm_state;
 205
 206 /* external API */
 207
 208 bool kvm_has_free_slot(MachineState *ms);
 209 bool kvm_has_sync_mmu(void);
 210 int kvm_has_vcpu_events(void);
 211 int kvm_has_robust_singlestep(void);
 212 int kvm_has_debugregs(void);
 213 int kvm_has_pit_state2(void);
 214 int kvm_has_many_ioeventfds(void);
 215 int kvm_has_gsi_routing(void);
 216 int kvm_has_intx_set_mask(void);
 217
 218 int kvm_init_vcpu(CPUState *cpu);
 219 int kvm_cpu_exec(CPUState *cpu);
 220 int kvm_destroy_vcpu(CPUState *cpu);
 221
 222 /**
 223  * kvm_arm_supports_user_irq
 224  *
 225  * Not all KVM implementations support notifications for kernel generated
 226  * interrupt events to user space. This function indicates whether the current
 227  * KVM implementation does support them.
 228  *
 229  * Returns: true if KVM supports using kernel generated IRQs from user space
 230  */
 231 bool kvm_arm_supports_user_irq(void);
 232
 233 /**
 234  * kvm_memcrypt_enabled - return boolean indicating whether memory encryption
 235  *                        is enabled
 236  * Returns: 1 memory encryption is enabled
 237  *          0 memory encryption is disabled
 238  */
 239 bool kvm_memcrypt_enabled(void);
 240
 241 /**
 242  * kvm_memcrypt_encrypt_data: encrypt the memory range
 243  *
 244  * Return: 1 failed to encrypt the range
 245  *         0 succesfully encrypted memory region
 246  */
 247 int kvm_memcrypt_encrypt_data(uint8_t *ptr, uint64_t len);
 248
 249
 250 #ifdef NEED_CPU_H
 251 #include "cpu.h"
 252
 253 void kvm_flush_coalesced_mmio_buffer(void);
 254
 255 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
 256                           target_ulong len, int type);
 257 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
 258                           target_ulong len, int type);
 259 void kvm_remove_all_breakpoints(CPUState *cpu);
 260 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap);
 261
 262 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
 263 int kvm_on_sigbus(int code, void *addr);
 264
 265 /* interface with exec.c */
 266
 267 void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align, bool shared));
 268
 269 /* internal API */
 270
 271 int kvm_ioctl(KVMState *s, int type, ...);
 272
 273 int kvm_vm_ioctl(KVMState *s, int type, ...);
 274
 275 int kvm_vcpu_ioctl(CPUState *cpu, int type, ...);
 276
 277 /**
 278  * kvm_device_ioctl - call an ioctl on a kvm device
 279  * @fd: The KVM device file descriptor as returned from KVM_CREATE_DEVICE
 280  * @type: The device-ctrl ioctl number
 281  *
 282  * Returns: -errno on error, nonnegative on success
 283  */
 284 int kvm_device_ioctl(int fd, int type, ...);
 285
 286 /**
 287  * kvm_vm_check_attr - check for existence of a specific vm attribute
 288  * @s: The KVMState pointer
 289  * @group: the group
 290  * @attr: the attribute of that group to query for
 291  *
 292  * Returns: 1 if the attribute exists
 293  *          0 if the attribute either does not exist or if the vm device
 294  *            interface is unavailable
 295  */
 296 int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr);
 297
 298 /**
 299  * kvm_device_check_attr - check for existence of a specific device attribute
 300  * @fd: The device file descriptor
 301  * @group: the group
 302  * @attr: the attribute of that group to query for
 303  *
 304  * Returns: 1 if the attribute exists
 305  *          0 if the attribute either does not exist or if the vm device
 306  *            interface is unavailable
 307  */
 308 int kvm_device_check_attr(int fd, uint32_t group, uint64_t attr);
 309
 310 /**
 311  * kvm_device_access - set or get value of a specific vm attribute
 312  * @fd: The device file descriptor
 313  * @group: the group
 314  * @attr: the attribute of that group to set or get
 315  * @val: pointer to a storage area for the value
 316  * @write: true for set and false for get operation
 317  * @errp: error object handle
 318  *
 319  * Returns: 0 on success
 320  *          < 0 on error
 321  * Use kvm_device_check_attr() in order to check for the availability
 322  * of optional attributes.
 323  */
 324 int kvm_device_access(int fd, int group, uint64_t attr,
 325                       void *val, bool write, Error **errp);
 326
 327 /**
 328  * kvm_create_device - create a KVM device for the device control API
 329  * @KVMState: The KVMState pointer
 330  * @type: The KVM device type (see Documentation/virtual/kvm/devices in the
 331  *        kernel source)
 332  * @test: If true, only test if device can be created, but don't actually
 333  *        create the device.
 334  *
 335  * Returns: -errno on error, nonnegative on success: @test ? 0 : device fd;
 336  */
 337 int kvm_create_device(KVMState *s, uint64_t type, bool test);
 338
 339 /**
 340  * kvm_device_supported - probe whether KVM supports specific device
 341  *
 342  * @vmfd: The fd handler for VM
 343  * @type: type of device
 344  *
 345  * @return: true if supported, otherwise false.
 346  */
 347 bool kvm_device_supported(int vmfd, uint64_t type);
 348
 349 /* Arch specific hooks */
 350
 351 extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
 352
 353 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run);
 354 MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run);
 355
 356 int kvm_arch_handle_exit(CPUState *cpu, struct kvm_run *run);
 357
 358 int kvm_arch_process_async_events(CPUState *cpu);
 359
 360 int kvm_arch_get_registers(CPUState *cpu);
 361
 362 /* state subset only touched by the VCPU itself during runtime */
 363 #define KVM_PUT_RUNTIME_STATE   1
 364 /* state subset modified during VCPU reset */
 365 #define KVM_PUT_RESET_STATE     2
 366 /* full state set, modified during initialization or on vmload */
 367 #define KVM_PUT_FULL_STATE      3
 368
 369 int kvm_arch_put_registers(CPUState *cpu, int level);
 370
 371 int kvm_arch_init(MachineState *ms, KVMState *s);
 372
 373 int kvm_arch_init_vcpu(CPUState *cpu);
 374
 375 bool kvm_vcpu_id_is_valid(int vcpu_id);
 376
 377 /* Returns VCPU ID to be used on KVM_CREATE_VCPU ioctl() */
 378 unsigned long kvm_arch_vcpu_id(CPUState *cpu);
 379
 380 #ifdef TARGET_I386
 381 #define KVM_HAVE_MCE_INJECTION 1
 382 void kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
 383 #endif
 384
 385 void kvm_arch_init_irq_routing(KVMState *s);
 386
 387 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
 388                              uint64_t address, uint32_t data, PCIDevice *dev);
 389
 390 /* Notify arch about newly added MSI routes */
 391 int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
 392                                 int vector, PCIDevice *dev);
 393 /* Notify arch about released MSI routes */
 394 int kvm_arch_release_virq_post(int virq);
 395
 396 int kvm_arch_msi_data_to_gsi(uint32_t data);
 397
 398 int kvm_set_irq(KVMState *s, int irq, int level);
 399 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg);
 400
 401 void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin);
 402
 403 void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
 404
 405 struct kvm_guest_debug;
 406 struct kvm_debug_exit_arch;
 407
 408 struct kvm_sw_breakpoint {
 409     target_ulong pc;
 410     target_ulong saved_insn;
 411     int use_count;
 412     QTAILQ_ENTRY(kvm_sw_breakpoint) entry;
 413 };
 414
 415 QTAILQ_HEAD(kvm_sw_breakpoint_head, kvm_sw_breakpoint);
 416
 417 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
 418                                                  target_ulong pc);
 419
 420 int kvm_sw_breakpoints_active(CPUState *cpu);
 421
 422 int kvm_arch_insert_sw_breakpoint(CPUState *cpu,
 423                                   struct kvm_sw_breakpoint *bp);
 424 int kvm_arch_remove_sw_breakpoint(CPUState *cpu,
 425                                   struct kvm_sw_breakpoint *bp);
 426 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
 427                                   target_ulong len, int type);
 428 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
 429                                   target_ulong len, int type);
 430 void kvm_arch_remove_all_hw_breakpoints(void);
 431
 432 void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg);
 433
 434 bool kvm_arch_stop_on_emulation_error(CPUState *cpu);
 435
 436 int kvm_check_extension(KVMState *s, unsigned int extension);
 437
 438 int kvm_vm_check_extension(KVMState *s, unsigned int extension);
 439
 440 #define kvm_vm_enable_cap(s, capability, cap_flags, ...)             \
 441     ({                                                               \
 442         struct kvm_enable_cap cap = {                                \
 443             .cap = capability,                                       \
 444             .flags = cap_flags,                                      \
 445         };                                                           \
 446         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
 447         size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
 448         memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
 449         kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap);                       \
 450     })
 451
 452 #define kvm_vcpu_enable_cap(cpu, capability, cap_flags, ...)         \
 453     ({                                                               \
 454         struct kvm_enable_cap cap = {                                \
 455             .cap = capability,                                       \
 456             .flags = cap_flags,                                      \
 457         };                                                           \
 458         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
 459         size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
 460         memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
 461         kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap);                   \
 462     })
 463
 464 uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
 465                                       uint32_t index, int reg);
 466
 467 void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len);
 468
 469 #if !defined(CONFIG_USER_ONLY)
 470 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
 471                                        hwaddr *phys_addr);
 472 #endif
 473
 474 #endif /* NEED_CPU_H */
 475
 476 void kvm_cpu_synchronize_state(CPUState *cpu);
 477 void kvm_cpu_synchronize_post_reset(CPUState *cpu);
 478 void kvm_cpu_synchronize_post_init(CPUState *cpu);
 479 void kvm_cpu_synchronize_pre_loadvm(CPUState *cpu);
 480
 481 void kvm_init_cpu_signals(CPUState *cpu);
 482
 483 /**
 484  * kvm_irqchip_add_msi_route - Add MSI route for specific vector
 485  * @s:      KVM state
 486  * @vector: which vector to add. This can be either MSI/MSIX
 487  *          vector. The function will automatically detect whether
 488  *          MSI/MSIX is enabled, and fetch corresponding MSI
 489  *          message.
 490  * @dev:    Owner PCI device to add the route. If @dev is specified
 491  *          as @NULL, an empty MSI message will be inited.
 492  * @return: virq (>=0) when success, errno (<0) when failed.
 493  */
 494 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev);
 495 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
 496                                  PCIDevice *dev);
 497 void kvm_irqchip_commit_routes(KVMState *s);
 498 void kvm_irqchip_release_virq(KVMState *s, int virq);
 499
 500 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter);
 501 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint);
 502
 503 int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
 504                                        EventNotifier *rn, int virq);
 505 int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
 506                                           int virq);
 507 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
 508                                    EventNotifier *rn, qemu_irq irq);
 509 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
 510                                       qemu_irq irq);
 511 void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi);
 512 void kvm_pc_gsi_handler(void *opaque, int n, int level);
 513 void kvm_pc_setup_irq_routing(bool pci_enabled);
 514 void kvm_init_irq_routing(KVMState *s);
 515
 516 /**
 517  * kvm_arch_irqchip_create:
 518  * @KVMState: The KVMState pointer
 519  * @MachineState: The MachineState pointer
 520  *
 521  * Allow architectures to create an in-kernel irq chip themselves.
 522  *
 523  * Returns: < 0: error
 524  *            0: irq chip was not created
 525  *          > 0: irq chip was created
 526  */
 527 int kvm_arch_irqchip_create(MachineState *ms, KVMState *s);
 528
 529 /**
 530  * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl
 531  * @id: The register ID
 532  * @source: The pointer to the value to be set. It must point to a variable
 533  *          of the correct type/size for the register being accessed.
 534  *
 535  * Returns: 0 on success, or a negative errno on failure.
 536  */
 537 int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source);
 538
 539 /**
 540  * kvm_get_one_reg - get a register value from KVM via KVM_GET_ONE_REG ioctl
 541  * @id: The register ID
 542  * @target: The pointer where the value is to be stored. It must point to a
 543  *          variable of the correct type/size for the register being accessed.
 544  *
 545  * Returns: 0 on success, or a negative errno on failure.
 546  */
 547 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target);
 548 struct ppc_radix_page_info *kvm_get_radix_page_info(void);
 549 int kvm_get_max_memslots(void);
 550 #endif