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TOMOYO Linux Cross Reference
Linux/include/linux/kvm_host.h

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  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/msi.h>
 19 #include <linux/slab.h>
 20 #include <linux/rcupdate.h>
 21 #include <asm/signal.h>
 22 
 23 #include <linux/kvm.h>
 24 #include <linux/kvm_para.h>
 25 
 26 #include <linux/kvm_types.h>
 27 
 28 #include <asm/kvm_host.h>
 29 
 30 #ifndef KVM_MMIO_SIZE
 31 #define KVM_MMIO_SIZE 8
 32 #endif
 33 
 34 /*
 35  * vcpu->requests bit members
 36  */
 37 #define KVM_REQ_TLB_FLUSH          0
 38 #define KVM_REQ_MIGRATE_TIMER      1
 39 #define KVM_REQ_REPORT_TPR_ACCESS  2
 40 #define KVM_REQ_MMU_RELOAD         3
 41 #define KVM_REQ_TRIPLE_FAULT       4
 42 #define KVM_REQ_PENDING_TIMER      5
 43 #define KVM_REQ_UNHALT             6
 44 #define KVM_REQ_MMU_SYNC           7
 45 #define KVM_REQ_CLOCK_UPDATE       8
 46 #define KVM_REQ_KICK               9
 47 #define KVM_REQ_DEACTIVATE_FPU    10
 48 #define KVM_REQ_EVENT             11
 49 #define KVM_REQ_APF_HALT          12
 50 
 51 #define KVM_USERSPACE_IRQ_SOURCE_ID     0
 52 
 53 struct kvm;
 54 struct kvm_vcpu;
 55 extern struct kmem_cache *kvm_vcpu_cache;
 56 
 57 /*
 58  * It would be nice to use something smarter than a linear search, TBD...
 59  * Thankfully we dont expect many devices to register (famous last words :),
 60  * so until then it will suffice.  At least its abstracted so we can change
 61  * in one place.
 62  */
 63 struct kvm_io_bus {
 64         int                   dev_count;
 65 #define NR_IOBUS_DEVS 200
 66         struct kvm_io_device *devs[NR_IOBUS_DEVS];
 67 };
 68 
 69 enum kvm_bus {
 70         KVM_MMIO_BUS,
 71         KVM_PIO_BUS,
 72         KVM_NR_BUSES
 73 };
 74 
 75 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 76                      int len, const void *val);
 77 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
 78                     void *val);
 79 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 80                             struct kvm_io_device *dev);
 81 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 82                               struct kvm_io_device *dev);
 83 
 84 #ifdef CONFIG_KVM_ASYNC_PF
 85 struct kvm_async_pf {
 86         struct work_struct work;
 87         struct list_head link;
 88         struct list_head queue;
 89         struct kvm_vcpu *vcpu;
 90         struct mm_struct *mm;
 91         gva_t gva;
 92         unsigned long addr;
 93         struct kvm_arch_async_pf arch;
 94         struct page *page;
 95         bool done;
 96 };
 97 
 98 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
 99 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
100 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
101                        struct kvm_arch_async_pf *arch);
102 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
103 #endif
104 
105 enum {
106         OUTSIDE_GUEST_MODE,
107         IN_GUEST_MODE,
108         EXITING_GUEST_MODE
109 };
110 
111 struct kvm_vcpu {
112         struct kvm *kvm;
113 #ifdef CONFIG_PREEMPT_NOTIFIERS
114         struct preempt_notifier preempt_notifier;
115 #endif
116         int cpu;
117         int vcpu_id;
118         int srcu_idx;
119         int mode;
120         unsigned long requests;
121         unsigned long guest_debug;
122 
123         struct mutex mutex;
124         struct kvm_run *run;
125 
126         int fpu_active;
127         int guest_fpu_loaded, guest_xcr0_loaded;
128         wait_queue_head_t wq;
129         struct pid *pid;
130         int sigset_active;
131         sigset_t sigset;
132         struct kvm_vcpu_stat stat;
133 
134 #ifdef CONFIG_HAS_IOMEM
135         int mmio_needed;
136         int mmio_read_completed;
137         int mmio_is_write;
138         int mmio_size;
139         int mmio_index;
140         unsigned char mmio_data[KVM_MMIO_SIZE];
141         gpa_t mmio_phys_addr;
142 #endif
143 
144 #ifdef CONFIG_KVM_ASYNC_PF
145         struct {
146                 u32 queued;
147                 struct list_head queue;
148                 struct list_head done;
149                 spinlock_t lock;
150         } async_pf;
151 #endif
152 
153         struct kvm_vcpu_arch arch;
154 };
155 
156 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
157 {
158         return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
159 }
160 
161 /*
162  * Some of the bitops functions do not support too long bitmaps.
163  * This number must be determined not to exceed such limits.
164  */
165 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
166 
167 struct kvm_lpage_info {
168         unsigned long rmap_pde;
169         int write_count;
170 };
171 
172 struct kvm_memory_slot {
173         gfn_t base_gfn;
174         unsigned long npages;
175         unsigned long flags;
176         unsigned long *rmap;
177         unsigned long *dirty_bitmap;
178         unsigned long *dirty_bitmap_head;
179         struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
180         unsigned long userspace_addr;
181         int user_alloc;
182         int id;
183 };
184 
185 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
186 {
187         return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
188 }
189 
190 struct kvm_kernel_irq_routing_entry {
191         u32 gsi;
192         u32 type;
193         int (*set)(struct kvm_kernel_irq_routing_entry *e,
194                    struct kvm *kvm, int irq_source_id, int level);
195         union {
196                 struct {
197                         unsigned irqchip;
198                         unsigned pin;
199                 } irqchip;
200                 struct msi_msg msi;
201         };
202         struct hlist_node link;
203 };
204 
205 #ifdef __KVM_HAVE_IOAPIC
206 
207 struct kvm_irq_routing_table {
208         int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
209         struct kvm_kernel_irq_routing_entry *rt_entries;
210         u32 nr_rt_entries;
211         /*
212          * Array indexed by gsi. Each entry contains list of irq chips
213          * the gsi is connected to.
214          */
215         struct hlist_head map[0];
216 };
217 
218 #else
219 
220 struct kvm_irq_routing_table {};
221 
222 #endif
223 
224 struct kvm_memslots {
225         int nmemslots;
226         u64 generation;
227         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
228                                         KVM_PRIVATE_MEM_SLOTS];
229 };
230 
231 struct kvm {
232         spinlock_t mmu_lock;
233         struct mutex slots_lock;
234         struct mm_struct *mm; /* userspace tied to this vm */
235         struct kvm_memslots *memslots;
236         struct srcu_struct srcu;
237 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
238         u32 bsp_vcpu_id;
239         struct kvm_vcpu *bsp_vcpu;
240 #endif
241         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
242         atomic_t online_vcpus;
243         int last_boosted_vcpu;
244         struct list_head vm_list;
245         struct mutex lock;
246         struct kvm_io_bus *buses[KVM_NR_BUSES];
247 #ifdef CONFIG_HAVE_KVM_EVENTFD
248         struct {
249                 spinlock_t        lock;
250                 struct list_head  items;
251         } irqfds;
252         struct list_head ioeventfds;
253 #endif
254         struct kvm_vm_stat stat;
255         struct kvm_arch arch;
256         atomic_t users_count;
257 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
258         struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
259         struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
260 #endif
261 
262         struct mutex irq_lock;
263 #ifdef CONFIG_HAVE_KVM_IRQCHIP
264         /*
265          * Update side is protected by irq_lock and,
266          * if configured, irqfds.lock.
267          */
268         struct kvm_irq_routing_table __rcu *irq_routing;
269         struct hlist_head mask_notifier_list;
270         struct hlist_head irq_ack_notifier_list;
271 #endif
272 
273 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
274         struct mmu_notifier mmu_notifier;
275         unsigned long mmu_notifier_seq;
276         long mmu_notifier_count;
277 #endif
278         long tlbs_dirty;
279 };
280 
281 /* The guest did something we don't support. */
282 #define pr_unimpl(vcpu, fmt, ...)                                       \
283  do {                                                                   \
284         if (printk_ratelimit())                                         \
285                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
286                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
287  } while (0)
288 
289 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
290 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
291 
292 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
293 {
294         smp_rmb();
295         return kvm->vcpus[i];
296 }
297 
298 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
299         for (idx = 0; \
300              idx < atomic_read(&kvm->online_vcpus) && \
301              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
302              idx++)
303 
304 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
305 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
306 
307 void vcpu_load(struct kvm_vcpu *vcpu);
308 void vcpu_put(struct kvm_vcpu *vcpu);
309 
310 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
311                   struct module *module);
312 void kvm_exit(void);
313 
314 void kvm_get_kvm(struct kvm *kvm);
315 void kvm_put_kvm(struct kvm *kvm);
316 
317 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
318 {
319         return rcu_dereference_check(kvm->memslots,
320                         srcu_read_lock_held(&kvm->srcu)
321                         || lockdep_is_held(&kvm->slots_lock));
322 }
323 
324 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
325 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
326 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
327 
328 extern struct page *bad_page;
329 extern pfn_t bad_pfn;
330 
331 int is_error_page(struct page *page);
332 int is_error_pfn(pfn_t pfn);
333 int is_hwpoison_pfn(pfn_t pfn);
334 int is_fault_pfn(pfn_t pfn);
335 int kvm_is_error_hva(unsigned long addr);
336 int kvm_set_memory_region(struct kvm *kvm,
337                           struct kvm_userspace_memory_region *mem,
338                           int user_alloc);
339 int __kvm_set_memory_region(struct kvm *kvm,
340                             struct kvm_userspace_memory_region *mem,
341                             int user_alloc);
342 int kvm_arch_prepare_memory_region(struct kvm *kvm,
343                                 struct kvm_memory_slot *memslot,
344                                 struct kvm_memory_slot old,
345                                 struct kvm_userspace_memory_region *mem,
346                                 int user_alloc);
347 void kvm_arch_commit_memory_region(struct kvm *kvm,
348                                 struct kvm_userspace_memory_region *mem,
349                                 struct kvm_memory_slot old,
350                                 int user_alloc);
351 void kvm_disable_largepages(void);
352 void kvm_arch_flush_shadow(struct kvm *kvm);
353 
354 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
355                             int nr_pages);
356 
357 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
358 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
359 void kvm_release_page_clean(struct page *page);
360 void kvm_release_page_dirty(struct page *page);
361 void kvm_set_page_dirty(struct page *page);
362 void kvm_set_page_accessed(struct page *page);
363 
364 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr);
365 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
366 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
367                        bool write_fault, bool *writable);
368 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
369 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
370                       bool *writable);
371 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
372                          struct kvm_memory_slot *slot, gfn_t gfn);
373 void kvm_release_pfn_dirty(pfn_t);
374 void kvm_release_pfn_clean(pfn_t pfn);
375 void kvm_set_pfn_dirty(pfn_t pfn);
376 void kvm_set_pfn_accessed(pfn_t pfn);
377 void kvm_get_pfn(pfn_t pfn);
378 
379 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
380                         int len);
381 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
382                           unsigned long len);
383 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
384 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
385                          int offset, int len);
386 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
387                     unsigned long len);
388 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
389                            void *data, unsigned long len);
390 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
391                               gpa_t gpa, unsigned long len);
392 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
393 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
394 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
395 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
396 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
397 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
398 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
399                              gfn_t gfn);
400 
401 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
402 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
403 void kvm_resched(struct kvm_vcpu *vcpu);
404 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
405 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
406 
407 void kvm_flush_remote_tlbs(struct kvm *kvm);
408 void kvm_reload_remote_mmus(struct kvm *kvm);
409 
410 long kvm_arch_dev_ioctl(struct file *filp,
411                         unsigned int ioctl, unsigned long arg);
412 long kvm_arch_vcpu_ioctl(struct file *filp,
413                          unsigned int ioctl, unsigned long arg);
414 
415 int kvm_dev_ioctl_check_extension(long ext);
416 
417 int kvm_get_dirty_log(struct kvm *kvm,
418                         struct kvm_dirty_log *log, int *is_dirty);
419 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
420                                 struct kvm_dirty_log *log);
421 
422 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
423                                    struct
424                                    kvm_userspace_memory_region *mem,
425                                    int user_alloc);
426 long kvm_arch_vm_ioctl(struct file *filp,
427                        unsigned int ioctl, unsigned long arg);
428 
429 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
430 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
431 
432 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
433                                     struct kvm_translation *tr);
434 
435 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
436 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
437 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
438                                   struct kvm_sregs *sregs);
439 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
440                                   struct kvm_sregs *sregs);
441 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
442                                     struct kvm_mp_state *mp_state);
443 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
444                                     struct kvm_mp_state *mp_state);
445 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
446                                         struct kvm_guest_debug *dbg);
447 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
448 
449 int kvm_arch_init(void *opaque);
450 void kvm_arch_exit(void);
451 
452 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
453 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
454 
455 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
456 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
457 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
458 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
459 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
460 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
461 
462 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
463 int kvm_arch_hardware_enable(void *garbage);
464 void kvm_arch_hardware_disable(void *garbage);
465 int kvm_arch_hardware_setup(void);
466 void kvm_arch_hardware_unsetup(void);
467 void kvm_arch_check_processor_compat(void *rtn);
468 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
469 
470 void kvm_free_physmem(struct kvm *kvm);
471 
472 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
473 static inline struct kvm *kvm_arch_alloc_vm(void)
474 {
475         return kzalloc(sizeof(struct kvm), GFP_KERNEL);
476 }
477 
478 static inline void kvm_arch_free_vm(struct kvm *kvm)
479 {
480         kfree(kvm);
481 }
482 #endif
483 
484 int kvm_arch_init_vm(struct kvm *kvm);
485 void kvm_arch_destroy_vm(struct kvm *kvm);
486 void kvm_free_all_assigned_devices(struct kvm *kvm);
487 void kvm_arch_sync_events(struct kvm *kvm);
488 
489 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
490 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
491 
492 int kvm_is_mmio_pfn(pfn_t pfn);
493 
494 struct kvm_irq_ack_notifier {
495         struct hlist_node link;
496         unsigned gsi;
497         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
498 };
499 
500 struct kvm_assigned_dev_kernel {
501         struct kvm_irq_ack_notifier ack_notifier;
502         struct list_head list;
503         int assigned_dev_id;
504         int host_segnr;
505         int host_busnr;
506         int host_devfn;
507         unsigned int entries_nr;
508         int host_irq;
509         bool host_irq_disabled;
510         struct msix_entry *host_msix_entries;
511         int guest_irq;
512         struct msix_entry *guest_msix_entries;
513         unsigned long irq_requested_type;
514         int irq_source_id;
515         int flags;
516         struct pci_dev *dev;
517         struct kvm *kvm;
518         spinlock_t intx_lock;
519         char irq_name[32];
520         struct pci_saved_state *pci_saved_state;
521 };
522 
523 struct kvm_irq_mask_notifier {
524         void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
525         int irq;
526         struct hlist_node link;
527 };
528 
529 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
530                                     struct kvm_irq_mask_notifier *kimn);
531 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
532                                       struct kvm_irq_mask_notifier *kimn);
533 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
534                              bool mask);
535 
536 #ifdef __KVM_HAVE_IOAPIC
537 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
538                                    union kvm_ioapic_redirect_entry *entry,
539                                    unsigned long *deliver_bitmask);
540 #endif
541 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
542 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
543                 int irq_source_id, int level);
544 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
545 void kvm_register_irq_ack_notifier(struct kvm *kvm,
546                                    struct kvm_irq_ack_notifier *kian);
547 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
548                                    struct kvm_irq_ack_notifier *kian);
549 int kvm_request_irq_source_id(struct kvm *kvm);
550 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
551 
552 /* For vcpu->arch.iommu_flags */
553 #define KVM_IOMMU_CACHE_COHERENCY       0x1
554 
555 #ifdef CONFIG_IOMMU_API
556 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
557 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
558 int kvm_iommu_map_guest(struct kvm *kvm);
559 int kvm_iommu_unmap_guest(struct kvm *kvm);
560 int kvm_assign_device(struct kvm *kvm,
561                       struct kvm_assigned_dev_kernel *assigned_dev);
562 int kvm_deassign_device(struct kvm *kvm,
563                         struct kvm_assigned_dev_kernel *assigned_dev);
564 #else /* CONFIG_IOMMU_API */
565 static inline int kvm_iommu_map_pages(struct kvm *kvm,
566                                       struct kvm_memory_slot *slot)
567 {
568         return 0;
569 }
570 
571 static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
572                                          struct kvm_memory_slot *slot)
573 {
574 }
575 
576 static inline int kvm_iommu_map_guest(struct kvm *kvm)
577 {
578         return -ENODEV;
579 }
580 
581 static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
582 {
583         return 0;
584 }
585 
586 static inline int kvm_assign_device(struct kvm *kvm,
587                 struct kvm_assigned_dev_kernel *assigned_dev)
588 {
589         return 0;
590 }
591 
592 static inline int kvm_deassign_device(struct kvm *kvm,
593                 struct kvm_assigned_dev_kernel *assigned_dev)
594 {
595         return 0;
596 }
597 #endif /* CONFIG_IOMMU_API */
598 
599 static inline void kvm_guest_enter(void)
600 {
601         BUG_ON(preemptible());
602         account_system_vtime(current);
603         current->flags |= PF_VCPU;
604         /* KVM does not hold any references to rcu protected data when it
605          * switches CPU into a guest mode. In fact switching to a guest mode
606          * is very similar to exiting to userspase from rcu point of view. In
607          * addition CPU may stay in a guest mode for quite a long time (up to
608          * one time slice). Lets treat guest mode as quiescent state, just like
609          * we do with user-mode execution.
610          */
611         rcu_virt_note_context_switch(smp_processor_id());
612 }
613 
614 static inline void kvm_guest_exit(void)
615 {
616         account_system_vtime(current);
617         current->flags &= ~PF_VCPU;
618 }
619 
620 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
621 {
622         return gfn_to_memslot(kvm, gfn)->id;
623 }
624 
625 static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
626                                                gfn_t gfn)
627 {
628         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
629 }
630 
631 static inline gpa_t gfn_to_gpa(gfn_t gfn)
632 {
633         return (gpa_t)gfn << PAGE_SHIFT;
634 }
635 
636 static inline gfn_t gpa_to_gfn(gpa_t gpa)
637 {
638         return (gfn_t)(gpa >> PAGE_SHIFT);
639 }
640 
641 static inline hpa_t pfn_to_hpa(pfn_t pfn)
642 {
643         return (hpa_t)pfn << PAGE_SHIFT;
644 }
645 
646 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
647 {
648         set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
649 }
650 
651 enum kvm_stat_kind {
652         KVM_STAT_VM,
653         KVM_STAT_VCPU,
654 };
655 
656 struct kvm_stats_debugfs_item {
657         const char *name;
658         int offset;
659         enum kvm_stat_kind kind;
660         struct dentry *dentry;
661 };
662 extern struct kvm_stats_debugfs_item debugfs_entries[];
663 extern struct dentry *kvm_debugfs_dir;
664 
665 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
666 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
667 {
668         if (unlikely(vcpu->kvm->mmu_notifier_count))
669                 return 1;
670         /*
671          * Both reads happen under the mmu_lock and both values are
672          * modified under mmu_lock, so there's no need of smb_rmb()
673          * here in between, otherwise mmu_notifier_count should be
674          * read before mmu_notifier_seq, see
675          * mmu_notifier_invalidate_range_end write side.
676          */
677         if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
678                 return 1;
679         return 0;
680 }
681 #endif
682 
683 #ifdef CONFIG_HAVE_KVM_IRQCHIP
684 
685 #define KVM_MAX_IRQ_ROUTES 1024
686 
687 int kvm_setup_default_irq_routing(struct kvm *kvm);
688 int kvm_set_irq_routing(struct kvm *kvm,
689                         const struct kvm_irq_routing_entry *entries,
690                         unsigned nr,
691                         unsigned flags);
692 void kvm_free_irq_routing(struct kvm *kvm);
693 
694 #else
695 
696 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
697 
698 #endif
699 
700 #ifdef CONFIG_HAVE_KVM_EVENTFD
701 
702 void kvm_eventfd_init(struct kvm *kvm);
703 int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
704 void kvm_irqfd_release(struct kvm *kvm);
705 void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
706 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
707 
708 #else
709 
710 static inline void kvm_eventfd_init(struct kvm *kvm) {}
711 
712 static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
713 {
714         return -EINVAL;
715 }
716 
717 static inline void kvm_irqfd_release(struct kvm *kvm) {}
718 
719 #ifdef CONFIG_HAVE_KVM_IRQCHIP
720 static inline void kvm_irq_routing_update(struct kvm *kvm,
721                                           struct kvm_irq_routing_table *irq_rt)
722 {
723         rcu_assign_pointer(kvm->irq_routing, irq_rt);
724 }
725 #endif
726 
727 static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
728 {
729         return -ENOSYS;
730 }
731 
732 #endif /* CONFIG_HAVE_KVM_EVENTFD */
733 
734 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
735 static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
736 {
737         return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
738 }
739 
740 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
741 
742 #else
743 
744 static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
745 
746 #endif
747 
748 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
749 
750 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
751                                   unsigned long arg);
752 
753 #else
754 
755 static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
756                                                 unsigned long arg)
757 {
758         return -ENOTTY;
759 }
760 
761 #endif
762 
763 static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
764 {
765         set_bit(req, &vcpu->requests);
766 }
767 
768 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
769 {
770         if (test_bit(req, &vcpu->requests)) {
771                 clear_bit(req, &vcpu->requests);
772                 return true;
773         } else {
774                 return false;
775         }
776 }
777 
778 #endif
779 
780 

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