include/linux/kvm_host.h

   1 #ifndef __KVM_HOST_H
   2 #define __KVM_HOST_H
   3
   4 /*
   5  * This work is licensed under the terms of the GNU GPL, version 2.  See
   6  * the COPYING file in the top-level directory.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/hardirq.h>
  11 #include <linux/list.h>
  12 #include <linux/mutex.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/mm.h>
  17 #include <linux/preempt.h>
  18 #include <linux/marker.h>
  19 #include <linux/msi.h>
  20 #include <asm/signal.h>
  21
  22 #include <linux/kvm.h>
  23 #include <linux/kvm_para.h>
  24
  25 #include <linux/kvm_types.h>
  26
  27 #include <asm/kvm_host.h>
  28
  29 /*
  30  * vcpu->requests bit members
  31  */
  32 #define KVM_REQ_TLB_FLUSH          0
  33 #define KVM_REQ_MIGRATE_TIMER      1
  34 #define KVM_REQ_REPORT_TPR_ACCESS  2
  35 #define KVM_REQ_MMU_RELOAD         3
  36 #define KVM_REQ_TRIPLE_FAULT       4
  37 #define KVM_REQ_PENDING_TIMER      5
  38 #define KVM_REQ_UNHALT             6
  39 #define KVM_REQ_MMU_SYNC           7
  40 #define KVM_REQ_KVMCLOCK_UPDATE    8
  41 #define KVM_REQ_KICK               9
  42
  43 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
  44
  45 struct kvm_vcpu;
  46 extern struct kmem_cache *kvm_vcpu_cache;
  47
  48 /*
  49  * It would be nice to use something smarter than a linear search, TBD...
  50  * Thankfully we dont expect many devices to register (famous last words :),
  51  * so until then it will suffice.  At least its abstracted so we can change
  52  * in one place.
  53  */
  54 struct kvm_io_bus {
  55         int                   dev_count;
  56 #define NR_IOBUS_DEVS 6
  57         struct kvm_io_device *devs[NR_IOBUS_DEVS];
  58 };
  59
  60 void kvm_io_bus_init(struct kvm_io_bus *bus);
  61 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
  62 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
  63                                           gpa_t addr, int len, int is_write);
  64 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
  65                              struct kvm_io_device *dev);
  66
  67 struct kvm_vcpu {
  68         struct kvm *kvm;
  69 #ifdef CONFIG_PREEMPT_NOTIFIERS
  70         struct preempt_notifier preempt_notifier;
  71 #endif
  72         int vcpu_id;
  73         struct mutex mutex;
  74         int   cpu;
  75         struct kvm_run *run;
  76         unsigned long requests;
  77         unsigned long guest_debug;
  78         int fpu_active;
  79         int guest_fpu_loaded;
  80         wait_queue_head_t wq;
  81         int sigset_active;
  82         sigset_t sigset;
  83         struct kvm_vcpu_stat stat;
  84
  85 #ifdef CONFIG_HAS_IOMEM
  86         int mmio_needed;
  87         int mmio_read_completed;
  88         int mmio_is_write;
  89         int mmio_size;
  90         unsigned char mmio_data[8];
  91         gpa_t mmio_phys_addr;
  92 #endif
  93
  94         struct kvm_vcpu_arch arch;
  95 };
  96
  97 struct kvm_memory_slot {
  98         gfn_t base_gfn;
  99         unsigned long npages;
 100         unsigned long flags;
 101         unsigned long *rmap;
 102         unsigned long *dirty_bitmap;
 103         struct {
 104                 unsigned long rmap_pde;
 105                 int write_count;
 106         } *lpage_info;
 107         unsigned long userspace_addr;
 108         int user_alloc;
 109 };
 110
 111 struct kvm_kernel_irq_routing_entry {
 112         u32 gsi;
 113         u32 type;
 114         int (*set)(struct kvm_kernel_irq_routing_entry *e,
 115                     struct kvm *kvm, int level);
 116         union {
 117                 struct {
 118                         unsigned irqchip;
 119                         unsigned pin;
 120                 } irqchip;
 121                 struct msi_msg msi;
 122         };
 123         struct list_head link;
 124 };
 125
 126 struct kvm {
 127         struct mutex lock; /* protects the vcpus array and APIC accesses */
 128         spinlock_t mmu_lock;
 129         spinlock_t requests_lock;
 130         struct rw_semaphore slots_lock;
 131         struct mm_struct *mm; /* userspace tied to this vm */
 132         int nmemslots;
 133         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 134                                         KVM_PRIVATE_MEM_SLOTS];
 135         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 136         struct list_head vm_list;
 137         struct kvm_io_bus mmio_bus;
 138         struct kvm_io_bus pio_bus;
 139         struct kvm_vm_stat stat;
 140         struct kvm_arch arch;
 141         atomic_t users_count;
 142 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 143         struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
 144         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
 145 #endif
 146
 147 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 148         struct list_head irq_routing; /* of kvm_kernel_irq_routing_entry */
 149         struct hlist_head mask_notifier_list;
 150 #endif
 151
 152 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 153         struct mmu_notifier mmu_notifier;
 154         unsigned long mmu_notifier_seq;
 155         long mmu_notifier_count;
 156 #endif
 157 };
 158
 159 /* The guest did something we don't support. */
 160 #define pr_unimpl(vcpu, fmt, ...)                                       \
 161  do {                                                                   \
 162         if (printk_ratelimit())                                         \
 163                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 164                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 165  } while (0)
 166
 167 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 168 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 169
 170 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 171 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 172
 173 void vcpu_load(struct kvm_vcpu *vcpu);
 174 void vcpu_put(struct kvm_vcpu *vcpu);
 175
 176 int kvm_init(void *opaque, unsigned int vcpu_size,
 177                   struct module *module);
 178 void kvm_exit(void);
 179
 180 void kvm_get_kvm(struct kvm *kvm);
 181 void kvm_put_kvm(struct kvm *kvm);
 182
 183 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 184 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 185 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 186 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 187
 188 extern struct page *bad_page;
 189 extern pfn_t bad_pfn;
 190
 191 int is_error_page(struct page *page);
 192 int is_error_pfn(pfn_t pfn);
 193 int kvm_is_error_hva(unsigned long addr);
 194 int kvm_set_memory_region(struct kvm *kvm,
 195                           struct kvm_userspace_memory_region *mem,
 196                           int user_alloc);
 197 int __kvm_set_memory_region(struct kvm *kvm,
 198                             struct kvm_userspace_memory_region *mem,
 199                             int user_alloc);
 200 int kvm_arch_set_memory_region(struct kvm *kvm,
 201                                 struct kvm_userspace_memory_region *mem,
 202                                 struct kvm_memory_slot old,
 203                                 int user_alloc);
 204 void kvm_arch_flush_shadow(struct kvm *kvm);
 205 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 206 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 207 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 208 void kvm_release_page_clean(struct page *page);
 209 void kvm_release_page_dirty(struct page *page);
 210 void kvm_set_page_dirty(struct page *page);
 211 void kvm_set_page_accessed(struct page *page);
 212
 213 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
 214 void kvm_release_pfn_dirty(pfn_t);
 215 void kvm_release_pfn_clean(pfn_t pfn);
 216 void kvm_set_pfn_dirty(pfn_t pfn);
 217 void kvm_set_pfn_accessed(pfn_t pfn);
 218 void kvm_get_pfn(pfn_t pfn);
 219
 220 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 221                         int len);
 222 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 223                           unsigned long len);
 224 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 225 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 226                          int offset, int len);
 227 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 228                     unsigned long len);
 229 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 230 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 231 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 232 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
 233 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 234
 235 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
 236 void kvm_resched(struct kvm_vcpu *vcpu);
 237 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 238 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 239 void kvm_flush_remote_tlbs(struct kvm *kvm);
 240 void kvm_reload_remote_mmus(struct kvm *kvm);
 241
 242 long kvm_arch_dev_ioctl(struct file *filp,
 243                         unsigned int ioctl, unsigned long arg);
 244 long kvm_arch_vcpu_ioctl(struct file *filp,
 245                          unsigned int ioctl, unsigned long arg);
 246 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 247 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 248
 249 int kvm_dev_ioctl_check_extension(long ext);
 250
 251 int kvm_get_dirty_log(struct kvm *kvm,
 252                         struct kvm_dirty_log *log, int *is_dirty);
 253 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 254                                 struct kvm_dirty_log *log);
 255
 256 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 257                                    struct
 258                                    kvm_userspace_memory_region *mem,
 259                                    int user_alloc);
 260 long kvm_arch_vm_ioctl(struct file *filp,
 261                        unsigned int ioctl, unsigned long arg);
 262
 263 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 264 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
 265
 266 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 267                                     struct kvm_translation *tr);
 268
 269 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 270 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
 271 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 272                                   struct kvm_sregs *sregs);
 273 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 274                                   struct kvm_sregs *sregs);
 275 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 276                                     struct kvm_mp_state *mp_state);
 277 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 278                                     struct kvm_mp_state *mp_state);
 279 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 280                                         struct kvm_guest_debug *dbg);
 281 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 282
 283 int kvm_arch_init(void *opaque);
 284 void kvm_arch_exit(void);
 285
 286 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
 287 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 288
 289 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 290 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 291 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 292 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 293 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 294 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 295
 296 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
 297 void kvm_arch_hardware_enable(void *garbage);
 298 void kvm_arch_hardware_disable(void *garbage);
 299 int kvm_arch_hardware_setup(void);
 300 void kvm_arch_hardware_unsetup(void);
 301 void kvm_arch_check_processor_compat(void *rtn);
 302 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 303 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 304
 305 void kvm_free_physmem(struct kvm *kvm);
 306
 307 struct  kvm *kvm_arch_create_vm(void);
 308 void kvm_arch_destroy_vm(struct kvm *kvm);
 309 void kvm_free_all_assigned_devices(struct kvm *kvm);
 310 void kvm_arch_sync_events(struct kvm *kvm);
 311
 312 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 313 int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
 314 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 315 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 316
 317 int kvm_is_mmio_pfn(pfn_t pfn);
 318
 319 struct kvm_irq_ack_notifier {
 320         struct hlist_node link;
 321         unsigned gsi;
 322         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 323 };
 324
 325 #define KVM_ASSIGNED_MSIX_PENDING               0x1
 326 struct kvm_guest_msix_entry {
 327         u32 vector;
 328         u16 entry;
 329         u16 flags;
 330 };
 331
 332 struct kvm_assigned_dev_kernel {
 333         struct kvm_irq_ack_notifier ack_notifier;
 334         struct work_struct interrupt_work;
 335         struct list_head list;
 336         int assigned_dev_id;
 337         int host_busnr;
 338         int host_devfn;
 339         unsigned int entries_nr;
 340         int host_irq;
 341         bool host_irq_disabled;
 342         struct msix_entry *host_msix_entries;
 343         int guest_irq;
 344         struct kvm_guest_msix_entry *guest_msix_entries;
 345         unsigned long irq_requested_type;
 346         int irq_source_id;
 347         int flags;
 348         struct pci_dev *dev;
 349         struct kvm *kvm;
 350         spinlock_t assigned_dev_lock;
 351 };
 352
 353 struct kvm_irq_mask_notifier {
 354         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
 355         int irq;
 356         struct hlist_node link;
 357 };
 358
 359 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 360                                     struct kvm_irq_mask_notifier *kimn);
 361 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 362                                       struct kvm_irq_mask_notifier *kimn);
 363 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
 364
 365 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level);
 366 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
 367 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 368                                    struct kvm_irq_ack_notifier *kian);
 369 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian);
 370 int kvm_request_irq_source_id(struct kvm *kvm);
 371 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 372
 373 /* For vcpu->arch.iommu_flags */
 374 #define KVM_IOMMU_CACHE_COHERENCY       0x1
 375
 376 #ifdef CONFIG_IOMMU_API
 377 int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
 378                         unsigned long npages);
 379 int kvm_iommu_map_guest(struct kvm *kvm);
 380 int kvm_iommu_unmap_guest(struct kvm *kvm);
 381 int kvm_assign_device(struct kvm *kvm,
 382                       struct kvm_assigned_dev_kernel *assigned_dev);
 383 int kvm_deassign_device(struct kvm *kvm,
 384                         struct kvm_assigned_dev_kernel *assigned_dev);
 385 #else /* CONFIG_IOMMU_API */
 386 static inline int kvm_iommu_map_pages(struct kvm *kvm,
 387                                       gfn_t base_gfn,
 388                                       unsigned long npages)
 389 {
 390         return 0;
 391 }
 392
 393 static inline int kvm_iommu_map_guest(struct kvm *kvm)
 394 {
 395         return -ENODEV;
 396 }
 397
 398 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 399 {
 400         return 0;
 401 }
 402
 403 static inline int kvm_assign_device(struct kvm *kvm,
 404                 struct kvm_assigned_dev_kernel *assigned_dev)
 405 {
 406         return 0;
 407 }
 408
 409 static inline int kvm_deassign_device(struct kvm *kvm,
 410                 struct kvm_assigned_dev_kernel *assigned_dev)
 411 {
 412         return 0;
 413 }
 414 #endif /* CONFIG_IOMMU_API */
 415
 416 static inline void kvm_guest_enter(void)
 417 {
 418         account_system_vtime(current);
 419         current->flags |= PF_VCPU;
 420 }
 421
 422 static inline void kvm_guest_exit(void)
 423 {
 424         account_system_vtime(current);
 425         current->flags &= ~PF_VCPU;
 426 }
 427
 428 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 429 {
 430         return slot - kvm->memslots;
 431 }
 432
 433 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 434 {
 435         return (gpa_t)gfn << PAGE_SHIFT;
 436 }
 437
 438 static inline hpa_t pfn_to_hpa(pfn_t pfn)
 439 {
 440         return (hpa_t)pfn << PAGE_SHIFT;
 441 }
 442
 443 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 444 {
 445         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
 446 }
 447
 448 enum kvm_stat_kind {
 449         KVM_STAT_VM,
 450         KVM_STAT_VCPU,
 451 };
 452
 453 struct kvm_stats_debugfs_item {
 454         const char *name;
 455         int offset;
 456         enum kvm_stat_kind kind;
 457         struct dentry *dentry;
 458 };
 459 extern struct kvm_stats_debugfs_item debugfs_entries[];
 460 extern struct dentry *kvm_debugfs_dir;
 461
 462 #define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
 463         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 464                                                 vcpu, 5, d1, d2, d3, d4, d5)
 465 #define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
 466         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 467                                                 vcpu, 4, d1, d2, d3, d4, 0)
 468 #define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
 469         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 470                                                 vcpu, 3, d1, d2, d3, 0, 0)
 471 #define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
 472         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 473                                                 vcpu, 2, d1, d2, 0, 0, 0)
 474 #define KVMTRACE_1D(evt, vcpu, d1, name) \
 475         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 476                                                 vcpu, 1, d1, 0, 0, 0, 0)
 477 #define KVMTRACE_0D(evt, vcpu, name) \
 478         trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
 479                                                 vcpu, 0, 0, 0, 0, 0, 0)
 480
 481 #ifdef CONFIG_KVM_TRACE
 482 int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg);
 483 void kvm_trace_cleanup(void);
 484 #else
 485 static inline
 486 int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg)
 487 {
 488         return -EINVAL;
 489 }
 490 #define kvm_trace_cleanup() ((void)0)
 491 #endif
 492
 493 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 494 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 495 {
 496         if (unlikely(vcpu->kvm->mmu_notifier_count))
 497                 return 1;
 498         /*
 499          * Both reads happen under the mmu_lock and both values are
 500          * modified under mmu_lock, so there's no need of smb_rmb()
 501          * here in between, otherwise mmu_notifier_count should be
 502          * read before mmu_notifier_seq, see
 503          * mmu_notifier_invalidate_range_end write side.
 504          */
 505         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
 506                 return 1;
 507         return 0;
 508 }
 509 #endif
 510
 511 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 512
 513 #define KVM_MAX_IRQ_ROUTES 1024
 514
 515 int kvm_setup_default_irq_routing(struct kvm *kvm);
 516 int kvm_set_irq_routing(struct kvm *kvm,
 517                         const struct kvm_irq_routing_entry *entries,
 518                         unsigned nr,
 519                         unsigned flags);
 520 void kvm_free_irq_routing(struct kvm *kvm);
 521
 522 #else
 523
 524 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
 525
 526 #endif
 527
 528 #endif