1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __KVM_HOST_H
3 #define __KVM_HOST_H
4
5
6 #include <linux/types.h>
7 #include <linux/hardirq.h>
8 #include <linux/list.h>
9 #include <linux/mutex.h>
10 #include <linux/spinlock.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/sched/stat.h>
14 #include <linux/bug.h>
15 #include <linux/minmax.h>
16 #include <linux/mm.h>
17 #include <linux/mmu_notifier.h>
18 #include <linux/preempt.h>
19 #include <linux/msi.h>
20 #include <linux/slab.h>
21 #include <linux/vmalloc.h>
22 #include <linux/rcupdate.h>
23 #include <linux/ratelimit.h>
24 #include <linux/err.h>
25 #include <linux/irqflags.h>
26 #include <linux/context_tracking.h>
27 #include <linux/irqbypass.h>
28 #include <linux/rcuwait.h>
29 #include <linux/refcount.h>
30 #include <linux/nospec.h>
31 #include <linux/notifier.h>
32 #include <linux/ftrace.h>
33 #include <linux/hashtable.h>
34 #include <linux/instrumentation.h>
35 #include <linux/interval_tree.h>
36 #include <linux/rbtree.h>
37 #include <linux/xarray.h>
38 #include <asm/signal.h>
39
40 #include <linux/kvm.h>
41 #include <linux/kvm_para.h>
42
43 #include <linux/kvm_types.h>
44
45 #include <asm/kvm_host.h>
46 #include <linux/kvm_dirty_ring.h>
47
48 #ifndef KVM_MAX_VCPU_IDS
49 #define KVM_MAX_VCPU_IDS KVM_MAX_VCPUS
50 #endif
51
52 /*
53 * The bit 16 ~ bit 31 of kvm_userspace_memory_region::flags are internally
54 * used in kvm, other bits are visible for userspace which are defined in
55 * include/linux/kvm_h.
56 */
57 #define KVM_MEMSLOT_INVALID (1UL << 16)
58
59 /*
60 * Bit 63 of the memslot generation number is an "update in-progress flag",
61 * e.g. is temporarily set for the duration of kvm_swap_active_memslots().
62 * This flag effectively creates a unique generation number that is used to
63 * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
64 * i.e. may (or may not) have come from the previous memslots generation.
65 *
66 * This is necessary because the actual memslots update is not atomic with
67 * respect to the generation number update. Updating the generation number
68 * first would allow a vCPU to cache a spte from the old memslots using the
69 * new generation number, and updating the generation number after switching
70 * to the new memslots would allow cache hits using the old generation number
71 * to reference the defunct memslots.
72 *
73 * This mechanism is used to prevent getting hits in KVM's caches while a
74 * memslot update is in-progress, and to prevent cache hits *after* updating
75 * the actual generation number against accesses that were inserted into the
76 * cache *before* the memslots were updated.
77 */
78 #define KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS BIT_ULL(63)
79
80 /* Two fragments for cross MMIO pages. */
81 #define KVM_MAX_MMIO_FRAGMENTS 2
82
83 #ifndef KVM_MAX_NR_ADDRESS_SPACES
84 #define KVM_MAX_NR_ADDRESS_SPACES 1
85 #endif
86
87 /*
88 * For the normal pfn, the highest 12 bits should be zero,
89 * so we can mask bit 62 ~ bit 52 to indicate the error pfn,
90 * mask bit 63 to indicate the noslot pfn.
91 */
92 #define KVM_PFN_ERR_MASK (0x7ffULL << 52)
93 #define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
94 #define KVM_PFN_NOSLOT (0x1ULL << 63)
95
96 #define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK)
97 #define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1)
98 #define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)
99 #define KVM_PFN_ERR_SIGPENDING (KVM_PFN_ERR_MASK + 3)
100
101 /*
102 * error pfns indicate that the gfn is in slot but faild to
103 * translate it to pfn on host.
104 */
is_error_pfn(kvm_pfn_t pfn)105 static inline bool is_error_pfn(kvm_pfn_t pfn)
106 {
107 return !!(pfn & KVM_PFN_ERR_MASK);
108 }
109
110 /*
111 * KVM_PFN_ERR_SIGPENDING indicates that fetching the PFN was interrupted
112 * by a pending signal. Note, the signal may or may not be fatal.
113 */
is_sigpending_pfn(kvm_pfn_t pfn)114 static inline bool is_sigpending_pfn(kvm_pfn_t pfn)
115 {
116 return pfn == KVM_PFN_ERR_SIGPENDING;
117 }
118
119 /*
120 * error_noslot pfns indicate that the gfn can not be
121 * translated to pfn - it is not in slot or failed to
122 * translate it to pfn.
123 */
is_error_noslot_pfn(kvm_pfn_t pfn)124 static inline bool is_error_noslot_pfn(kvm_pfn_t pfn)
125 {
126 return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
127 }
128
129 /* noslot pfn indicates that the gfn is not in slot. */
is_noslot_pfn(kvm_pfn_t pfn)130 static inline bool is_noslot_pfn(kvm_pfn_t pfn)
131 {
132 return pfn == KVM_PFN_NOSLOT;
133 }
134
135 /*
136 * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
137 * provide own defines and kvm_is_error_hva
138 */
139 #ifndef KVM_HVA_ERR_BAD
140
141 #define KVM_HVA_ERR_BAD (PAGE_OFFSET)
142 #define KVM_HVA_ERR_RO_BAD (PAGE_OFFSET + PAGE_SIZE)
143
kvm_is_error_hva(unsigned long addr)144 static inline bool kvm_is_error_hva(unsigned long addr)
145 {
146 return addr >= PAGE_OFFSET;
147 }
148
149 #endif
150
kvm_is_error_gpa(gpa_t gpa)151 static inline bool kvm_is_error_gpa(gpa_t gpa)
152 {
153 return gpa == INVALID_GPA;
154 }
155
156 #define KVM_ERR_PTR_BAD_PAGE (ERR_PTR(-ENOENT))
157
is_error_page(struct page * page)158 static inline bool is_error_page(struct page *page)
159 {
160 return IS_ERR(page);
161 }
162
163 #define KVM_REQUEST_MASK GENMASK(7,0)
164 #define KVM_REQUEST_NO_WAKEUP BIT(8)
165 #define KVM_REQUEST_WAIT BIT(9)
166 #define KVM_REQUEST_NO_ACTION BIT(10)
167 /*
168 * Architecture-independent vcpu->requests bit members
169 * Bits 3-7 are reserved for more arch-independent bits.
170 */
171 #define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
172 #define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
173 #define KVM_REQ_UNBLOCK 2
174 #define KVM_REQ_DIRTY_RING_SOFT_FULL 3
175 #define KVM_REQUEST_ARCH_BASE 8
176
177 /*
178 * KVM_REQ_OUTSIDE_GUEST_MODE exists is purely as way to force the vCPU to
179 * OUTSIDE_GUEST_MODE. KVM_REQ_OUTSIDE_GUEST_MODE differs from a vCPU "kick"
180 * in that it ensures the vCPU has reached OUTSIDE_GUEST_MODE before continuing
181 * on. A kick only guarantees that the vCPU is on its way out, e.g. a previous
182 * kick may have set vcpu->mode to EXITING_GUEST_MODE, and so there's no
183 * guarantee the vCPU received an IPI and has actually exited guest mode.
184 */
185 #define KVM_REQ_OUTSIDE_GUEST_MODE (KVM_REQUEST_NO_ACTION | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
186
187 #define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
188 BUILD_BUG_ON((unsigned)(nr) >= (sizeof_field(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \
189 (unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
190 })
191 #define KVM_ARCH_REQ(nr) KVM_ARCH_REQ_FLAGS(nr, 0)
192
193 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
194 unsigned long *vcpu_bitmap);
195 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
196
197 #define KVM_USERSPACE_IRQ_SOURCE_ID 0
198 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
199
200 extern struct mutex kvm_lock;
201 extern struct list_head vm_list;
202
203 struct kvm_io_range {
204 gpa_t addr;
205 int len;
206 struct kvm_io_device *dev;
207 };
208
209 #define NR_IOBUS_DEVS 1000
210
211 struct kvm_io_bus {
212 int dev_count;
213 int ioeventfd_count;
214 struct kvm_io_range range[];
215 };
216
217 enum kvm_bus {
218 KVM_MMIO_BUS,
219 KVM_PIO_BUS,
220 KVM_VIRTIO_CCW_NOTIFY_BUS,
221 KVM_FAST_MMIO_BUS,
222 KVM_NR_BUSES
223 };
224
225 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
226 int len, const void *val);
227 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
228 gpa_t addr, int len, const void *val, long cookie);
229 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
230 int len, void *val);
231 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
232 int len, struct kvm_io_device *dev);
233 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
234 struct kvm_io_device *dev);
235 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
236 gpa_t addr);
237
238 #ifdef CONFIG_KVM_ASYNC_PF
239 struct kvm_async_pf {
240 struct work_struct work;
241 struct list_head link;
242 struct list_head queue;
243 struct kvm_vcpu *vcpu;
244 gpa_t cr2_or_gpa;
245 unsigned long addr;
246 struct kvm_arch_async_pf arch;
247 bool wakeup_all;
248 bool notpresent_injected;
249 };
250
251 void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
252 void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
253 bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
254 unsigned long hva, struct kvm_arch_async_pf *arch);
255 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
256 #endif
257
258 #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
259 union kvm_mmu_notifier_arg {
260 unsigned long attributes;
261 };
262
263 struct kvm_gfn_range {
264 struct kvm_memory_slot *slot;
265 gfn_t start;
266 gfn_t end;
267 union kvm_mmu_notifier_arg arg;
268 bool may_block;
269 };
270 bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
271 bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
272 bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
273 #endif
274
275 enum {
276 OUTSIDE_GUEST_MODE,
277 IN_GUEST_MODE,
278 EXITING_GUEST_MODE,
279 READING_SHADOW_PAGE_TABLES,
280 };
281
282 #define KVM_UNMAPPED_PAGE ((void *) 0x500 + POISON_POINTER_DELTA)
283
284 struct kvm_host_map {
285 /*
286 * Only valid if the 'pfn' is managed by the host kernel (i.e. There is
287 * a 'struct page' for it. When using mem= kernel parameter some memory
288 * can be used as guest memory but they are not managed by host
289 * kernel).
290 * If 'pfn' is not managed by the host kernel, this field is
291 * initialized to KVM_UNMAPPED_PAGE.
292 */
293 struct page *page;
294 void *hva;
295 kvm_pfn_t pfn;
296 kvm_pfn_t gfn;
297 };
298
299 /*
300 * Used to check if the mapping is valid or not. Never use 'kvm_host_map'
301 * directly to check for that.
302 */
kvm_vcpu_mapped(struct kvm_host_map * map)303 static inline bool kvm_vcpu_mapped(struct kvm_host_map *map)
304 {
305 return !!map->hva;
306 }
307
kvm_vcpu_can_poll(ktime_t cur,ktime_t stop)308 static inline bool kvm_vcpu_can_poll(ktime_t cur, ktime_t stop)
309 {
310 return single_task_running() && !need_resched() && ktime_before(cur, stop);
311 }
312
313 /*
314 * Sometimes a large or cross-page mmio needs to be broken up into separate
315 * exits for userspace servicing.
316 */
317 struct kvm_mmio_fragment {
318 gpa_t gpa;
319 void *data;
320 unsigned len;
321 };
322
323 struct kvm_vcpu {
324 struct kvm *kvm;
325 #ifdef CONFIG_PREEMPT_NOTIFIERS
326 struct preempt_notifier preempt_notifier;
327 #endif
328 int cpu;
329 int vcpu_id; /* id given by userspace at creation */
330 int vcpu_idx; /* index into kvm->vcpu_array */
331 int ____srcu_idx; /* Don't use this directly. You've been warned. */
332 #ifdef CONFIG_PROVE_RCU
333 int srcu_depth;
334 #endif
335 int mode;
336 u64 requests;
337 unsigned long guest_debug;
338
339 struct mutex mutex;
340 struct kvm_run *run;
341
342 #ifndef __KVM_HAVE_ARCH_WQP
343 struct rcuwait wait;
344 #endif
345 struct pid __rcu *pid;
346 int sigset_active;
347 sigset_t sigset;
348 unsigned int halt_poll_ns;
349 bool valid_wakeup;
350
351 #ifdef CONFIG_HAS_IOMEM
352 int mmio_needed;
353 int mmio_read_completed;
354 int mmio_is_write;
355 int mmio_cur_fragment;
356 int mmio_nr_fragments;
357 struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
358 #endif
359
360 #ifdef CONFIG_KVM_ASYNC_PF
361 struct {
362 u32 queued;
363 struct list_head queue;
364 struct list_head done;
365 spinlock_t lock;
366 } async_pf;
367 #endif
368
369 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
370 /*
371 * Cpu relax intercept or pause loop exit optimization
372 * in_spin_loop: set when a vcpu does a pause loop exit
373 * or cpu relax intercepted.
374 * dy_eligible: indicates whether vcpu is eligible for directed yield.
375 */
376 struct {
377 bool in_spin_loop;
378 bool dy_eligible;
379 } spin_loop;
380 #endif
381 bool preempted;
382 bool ready;
383 struct kvm_vcpu_arch arch;
384 struct kvm_vcpu_stat stat;
385 char stats_id[KVM_STATS_NAME_SIZE];
386 struct kvm_dirty_ring dirty_ring;
387
388 /*
389 * The most recently used memslot by this vCPU and the slots generation
390 * for which it is valid.
391 * No wraparound protection is needed since generations won't overflow in
392 * thousands of years, even assuming 1M memslot operations per second.
393 */
394 struct kvm_memory_slot *last_used_slot;
395 u64 last_used_slot_gen;
396 };
397
398 /*
399 * Start accounting time towards a guest.
400 * Must be called before entering guest context.
401 */
guest_timing_enter_irqoff(void)402 static __always_inline void guest_timing_enter_irqoff(void)
403 {
404 /*
405 * This is running in ioctl context so its safe to assume that it's the
406 * stime pending cputime to flush.
407 */
408 instrumentation_begin();
409 vtime_account_guest_enter();
410 instrumentation_end();
411 }
412
413 /*
414 * Enter guest context and enter an RCU extended quiescent state.
415 *
416 * Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is
417 * unsafe to use any code which may directly or indirectly use RCU, tracing
418 * (including IRQ flag tracing), or lockdep. All code in this period must be
419 * non-instrumentable.
420 */
guest_context_enter_irqoff(void)421 static __always_inline void guest_context_enter_irqoff(void)
422 {
423 /*
424 * KVM does not hold any references to rcu protected data when it
425 * switches CPU into a guest mode. In fact switching to a guest mode
426 * is very similar to exiting to userspace from rcu point of view. In
427 * addition CPU may stay in a guest mode for quite a long time (up to
428 * one time slice). Lets treat guest mode as quiescent state, just like
429 * we do with user-mode execution.
430 */
431 if (!context_tracking_guest_enter()) {
432 instrumentation_begin();
433 rcu_virt_note_context_switch();
434 instrumentation_end();
435 }
436 }
437
438 /*
439 * Deprecated. Architectures should move to guest_timing_enter_irqoff() and
440 * guest_state_enter_irqoff().
441 */
guest_enter_irqoff(void)442 static __always_inline void guest_enter_irqoff(void)
443 {
444 guest_timing_enter_irqoff();
445 guest_context_enter_irqoff();
446 }
447
448 /**
449 * guest_state_enter_irqoff - Fixup state when entering a guest
450 *
451 * Entry to a guest will enable interrupts, but the kernel state is interrupts
452 * disabled when this is invoked. Also tell RCU about it.
453 *
454 * 1) Trace interrupts on state
455 * 2) Invoke context tracking if enabled to adjust RCU state
456 * 3) Tell lockdep that interrupts are enabled
457 *
458 * Invoked from architecture specific code before entering a guest.
459 * Must be called with interrupts disabled and the caller must be
460 * non-instrumentable.
461 * The caller has to invoke guest_timing_enter_irqoff() before this.
462 *
463 * Note: this is analogous to exit_to_user_mode().
464 */
guest_state_enter_irqoff(void)465 static __always_inline void guest_state_enter_irqoff(void)
466 {
467 instrumentation_begin();
468 trace_hardirqs_on_prepare();
469 lockdep_hardirqs_on_prepare();
470 instrumentation_end();
471
472 guest_context_enter_irqoff();
473 lockdep_hardirqs_on(CALLER_ADDR0);
474 }
475
476 /*
477 * Exit guest context and exit an RCU extended quiescent state.
478 *
479 * Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is
480 * unsafe to use any code which may directly or indirectly use RCU, tracing
481 * (including IRQ flag tracing), or lockdep. All code in this period must be
482 * non-instrumentable.
483 */
guest_context_exit_irqoff(void)484 static __always_inline void guest_context_exit_irqoff(void)
485 {
486 context_tracking_guest_exit();
487 }
488
489 /*
490 * Stop accounting time towards a guest.
491 * Must be called after exiting guest context.
492 */
guest_timing_exit_irqoff(void)493 static __always_inline void guest_timing_exit_irqoff(void)
494 {
495 instrumentation_begin();
496 /* Flush the guest cputime we spent on the guest */
497 vtime_account_guest_exit();
498 instrumentation_end();
499 }
500
501 /*
502 * Deprecated. Architectures should move to guest_state_exit_irqoff() and
503 * guest_timing_exit_irqoff().
504 */
guest_exit_irqoff(void)505 static __always_inline void guest_exit_irqoff(void)
506 {
507 guest_context_exit_irqoff();
508 guest_timing_exit_irqoff();
509 }
510
guest_exit(void)511 static inline void guest_exit(void)
512 {
513 unsigned long flags;
514
515 local_irq_save(flags);
516 guest_exit_irqoff();
517 local_irq_restore(flags);
518 }
519
520 /**
521 * guest_state_exit_irqoff - Establish state when returning from guest mode
522 *
523 * Entry from a guest disables interrupts, but guest mode is traced as
524 * interrupts enabled. Also with NO_HZ_FULL RCU might be idle.
525 *
526 * 1) Tell lockdep that interrupts are disabled
527 * 2) Invoke context tracking if enabled to reactivate RCU
528 * 3) Trace interrupts off state
529 *
530 * Invoked from architecture specific code after exiting a guest.
531 * Must be invoked with interrupts disabled and the caller must be
532 * non-instrumentable.
533 * The caller has to invoke guest_timing_exit_irqoff() after this.
534 *
535 * Note: this is analogous to enter_from_user_mode().
536 */
guest_state_exit_irqoff(void)537 static __always_inline void guest_state_exit_irqoff(void)
538 {
539 lockdep_hardirqs_off(CALLER_ADDR0);
540 guest_context_exit_irqoff();
541
542 instrumentation_begin();
543 trace_hardirqs_off_finish();
544 instrumentation_end();
545 }
546
kvm_vcpu_exiting_guest_mode(struct kvm_vcpu * vcpu)547 static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
548 {
549 /*
550 * The memory barrier ensures a previous write to vcpu->requests cannot
551 * be reordered with the read of vcpu->mode. It pairs with the general
552 * memory barrier following the write of vcpu->mode in VCPU RUN.
553 */
554 smp_mb__before_atomic();
555 return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
556 }
557
558 /*
559 * Some of the bitops functions do not support too long bitmaps.
560 * This number must be determined not to exceed such limits.
561 */
562 #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
563
564 /*
565 * Since at idle each memslot belongs to two memslot sets it has to contain
566 * two embedded nodes for each data structure that it forms a part of.
567 *
568 * Two memslot sets (one active and one inactive) are necessary so the VM
569 * continues to run on one memslot set while the other is being modified.
570 *
571 * These two memslot sets normally point to the same set of memslots.
572 * They can, however, be desynchronized when performing a memslot management
573 * operation by replacing the memslot to be modified by its copy.
574 * After the operation is complete, both memslot sets once again point to
575 * the same, common set of memslot data.
576 *
577 * The memslots themselves are independent of each other so they can be
578 * individually added or deleted.
579 */
580 struct kvm_memory_slot {
581 struct hlist_node id_node[2];
582 struct interval_tree_node hva_node[2];
583 struct rb_node gfn_node[2];
584 gfn_t base_gfn;
585 unsigned long npages;
586 unsigned long *dirty_bitmap;
587 struct kvm_arch_memory_slot arch;
588 unsigned long userspace_addr;
589 u32 flags;
590 short id;
591 u16 as_id;
592
593 #ifdef CONFIG_KVM_PRIVATE_MEM
594 struct {
595 struct file __rcu *file;
596 pgoff_t pgoff;
597 } gmem;
598 #endif
599 };
600
kvm_slot_can_be_private(const struct kvm_memory_slot * slot)601 static inline bool kvm_slot_can_be_private(const struct kvm_memory_slot *slot)
602 {
603 return slot && (slot->flags & KVM_MEM_GUEST_MEMFD);
604 }
605
kvm_slot_dirty_track_enabled(const struct kvm_memory_slot * slot)606 static inline bool kvm_slot_dirty_track_enabled(const struct kvm_memory_slot *slot)
607 {
608 return slot->flags & KVM_MEM_LOG_DIRTY_PAGES;
609 }
610
kvm_dirty_bitmap_bytes(struct kvm_memory_slot * memslot)611 static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
612 {
613 return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
614 }
615
kvm_second_dirty_bitmap(struct kvm_memory_slot * memslot)616 static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot)
617 {
618 unsigned long len = kvm_dirty_bitmap_bytes(memslot);
619
620 return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
621 }
622
623 #ifndef KVM_DIRTY_LOG_MANUAL_CAPS
624 #define KVM_DIRTY_LOG_MANUAL_CAPS KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
625 #endif
626
627 struct kvm_s390_adapter_int {
628 u64 ind_addr;
629 u64 summary_addr;
630 u64 ind_offset;
631 u32 summary_offset;
632 u32 adapter_id;
633 };
634
635 struct kvm_hv_sint {
636 u32 vcpu;
637 u32 sint;
638 };
639
640 struct kvm_xen_evtchn {
641 u32 port;
642 u32 vcpu_id;
643 int vcpu_idx;
644 u32 priority;
645 };
646
647 struct kvm_kernel_irq_routing_entry {
648 u32 gsi;
649 u32 type;
650 int (*set)(struct kvm_kernel_irq_routing_entry *e,
651 struct kvm *kvm, int irq_source_id, int level,
652 bool line_status);
653 union {
654 struct {
655 unsigned irqchip;
656 unsigned pin;
657 } irqchip;
658 struct {
659 u32 address_lo;
660 u32 address_hi;
661 u32 data;
662 u32 flags;
663 u32 devid;
664 } msi;
665 struct kvm_s390_adapter_int adapter;
666 struct kvm_hv_sint hv_sint;
667 struct kvm_xen_evtchn xen_evtchn;
668 };
669 struct hlist_node link;
670 };
671
672 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
673 struct kvm_irq_routing_table {
674 int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
675 u32 nr_rt_entries;
676 /*
677 * Array indexed by gsi. Each entry contains list of irq chips
678 * the gsi is connected to.
679 */
680 struct hlist_head map[] __counted_by(nr_rt_entries);
681 };
682 #endif
683
684 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm);
685
686 #ifndef KVM_INTERNAL_MEM_SLOTS
687 #define KVM_INTERNAL_MEM_SLOTS 0
688 #endif
689
690 #define KVM_MEM_SLOTS_NUM SHRT_MAX
691 #define KVM_USER_MEM_SLOTS (KVM_MEM_SLOTS_NUM - KVM_INTERNAL_MEM_SLOTS)
692
693 #if KVM_MAX_NR_ADDRESS_SPACES == 1
kvm_arch_nr_memslot_as_ids(struct kvm * kvm)694 static inline int kvm_arch_nr_memslot_as_ids(struct kvm *kvm)
695 {
696 return KVM_MAX_NR_ADDRESS_SPACES;
697 }
698
kvm_arch_vcpu_memslots_id(struct kvm_vcpu * vcpu)699 static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
700 {
701 return 0;
702 }
703 #endif
704
705 /*
706 * Arch code must define kvm_arch_has_private_mem if support for private memory
707 * is enabled.
708 */
709 #if !defined(kvm_arch_has_private_mem) && !IS_ENABLED(CONFIG_KVM_PRIVATE_MEM)
kvm_arch_has_private_mem(struct kvm * kvm)710 static inline bool kvm_arch_has_private_mem(struct kvm *kvm)
711 {
712 return false;
713 }
714 #endif
715
716 struct kvm_memslots {
717 u64 generation;
718 atomic_long_t last_used_slot;
719 struct rb_root_cached hva_tree;
720 struct rb_root gfn_tree;
721 /*
722 * The mapping table from slot id to memslot.
723 *
724 * 7-bit bucket count matches the size of the old id to index array for
725 * 512 slots, while giving good performance with this slot count.
726 * Higher bucket counts bring only small performance improvements but
727 * always result in higher memory usage (even for lower memslot counts).
728 */
729 DECLARE_HASHTABLE(id_hash, 7);
730 int node_idx;
731 };
732
733 struct kvm {
734 #ifdef KVM_HAVE_MMU_RWLOCK
735 rwlock_t mmu_lock;
736 #else
737 spinlock_t mmu_lock;
738 #endif /* KVM_HAVE_MMU_RWLOCK */
739
740 struct mutex slots_lock;
741
742 /*
743 * Protects the arch-specific fields of struct kvm_memory_slots in
744 * use by the VM. To be used under the slots_lock (above) or in a
745 * kvm->srcu critical section where acquiring the slots_lock would
746 * lead to deadlock with the synchronize_srcu in
747 * kvm_swap_active_memslots().
748 */
749 struct mutex slots_arch_lock;
750 struct mm_struct *mm; /* userspace tied to this vm */
751 unsigned long nr_memslot_pages;
752 /* The two memslot sets - active and inactive (per address space) */
753 struct kvm_memslots __memslots[KVM_MAX_NR_ADDRESS_SPACES][2];
754 /* The current active memslot set for each address space */
755 struct kvm_memslots __rcu *memslots[KVM_MAX_NR_ADDRESS_SPACES];
756 struct xarray vcpu_array;
757 /*
758 * Protected by slots_lock, but can be read outside if an
759 * incorrect answer is acceptable.
760 */
761 atomic_t nr_memslots_dirty_logging;
762
763 /* Used to wait for completion of MMU notifiers. */
764 spinlock_t mn_invalidate_lock;
765 unsigned long mn_active_invalidate_count;
766 struct rcuwait mn_memslots_update_rcuwait;
767
768 /* For management / invalidation of gfn_to_pfn_caches */
769 spinlock_t gpc_lock;
770 struct list_head gpc_list;
771
772 /*
773 * created_vcpus is protected by kvm->lock, and is incremented
774 * at the beginning of KVM_CREATE_VCPU. online_vcpus is only
775 * incremented after storing the kvm_vcpu pointer in vcpus,
776 * and is accessed atomically.
777 */
778 atomic_t online_vcpus;
779 int max_vcpus;
780 int created_vcpus;
781 int last_boosted_vcpu;
782 struct list_head vm_list;
783 struct mutex lock;
784 struct kvm_io_bus __rcu *buses[KVM_NR_BUSES];
785 #ifdef CONFIG_HAVE_KVM_IRQCHIP
786 struct {
787 spinlock_t lock;
788 struct list_head items;
789 /* resampler_list update side is protected by resampler_lock. */
790 struct list_head resampler_list;
791 struct mutex resampler_lock;
792 } irqfds;
793 #endif
794 struct list_head ioeventfds;
795 struct kvm_vm_stat stat;
796 struct kvm_arch arch;
797 refcount_t users_count;
798 #ifdef CONFIG_KVM_MMIO
799 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
800 spinlock_t ring_lock;
801 struct list_head coalesced_zones;
802 #endif
803
804 struct mutex irq_lock;
805 #ifdef CONFIG_HAVE_KVM_IRQCHIP
806 /*
807 * Update side is protected by irq_lock.
808 */
809 struct kvm_irq_routing_table __rcu *irq_routing;
810
811 struct hlist_head irq_ack_notifier_list;
812 #endif
813
814 #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
815 struct mmu_notifier mmu_notifier;
816 unsigned long mmu_invalidate_seq;
817 long mmu_invalidate_in_progress;
818 gfn_t mmu_invalidate_range_start;
819 gfn_t mmu_invalidate_range_end;
820 #endif
821 struct list_head devices;
822 u64 manual_dirty_log_protect;
823 struct dentry *debugfs_dentry;
824 struct kvm_stat_data **debugfs_stat_data;
825 struct srcu_struct srcu;
826 struct srcu_struct irq_srcu;
827 pid_t userspace_pid;
828 bool override_halt_poll_ns;
829 unsigned int max_halt_poll_ns;
830 u32 dirty_ring_size;
831 bool dirty_ring_with_bitmap;
832 bool vm_bugged;
833 bool vm_dead;
834
835 #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
836 struct notifier_block pm_notifier;
837 #endif
838 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
839 /* Protected by slots_locks (for writes) and RCU (for reads) */
840 struct xarray mem_attr_array;
841 #endif
842 char stats_id[KVM_STATS_NAME_SIZE];
843 };
844
845 #define kvm_err(fmt, ...) \
846 pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
847 #define kvm_info(fmt, ...) \
848 pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
849 #define kvm_debug(fmt, ...) \
850 pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
851 #define kvm_debug_ratelimited(fmt, ...) \
852 pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \
853 ## __VA_ARGS__)
854 #define kvm_pr_unimpl(fmt, ...) \
855 pr_err_ratelimited("kvm [%i]: " fmt, \
856 task_tgid_nr(current), ## __VA_ARGS__)
857
858 /* The guest did something we don't support. */
859 #define vcpu_unimpl(vcpu, fmt, ...) \
860 kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt, \
861 (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
862
863 #define vcpu_debug(vcpu, fmt, ...) \
864 kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
865 #define vcpu_debug_ratelimited(vcpu, fmt, ...) \
866 kvm_debug_ratelimited("vcpu%i " fmt, (vcpu)->vcpu_id, \
867 ## __VA_ARGS__)
868 #define vcpu_err(vcpu, fmt, ...) \
869 kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
870
kvm_vm_dead(struct kvm * kvm)871 static inline void kvm_vm_dead(struct kvm *kvm)
872 {
873 kvm->vm_dead = true;
874 kvm_make_all_cpus_request(kvm, KVM_REQ_VM_DEAD);
875 }
876
kvm_vm_bugged(struct kvm * kvm)877 static inline void kvm_vm_bugged(struct kvm *kvm)
878 {
879 kvm->vm_bugged = true;
880 kvm_vm_dead(kvm);
881 }
882
883
884 #define KVM_BUG(cond, kvm, fmt...) \
885 ({ \
886 bool __ret = !!(cond); \
887 \
888 if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \
889 kvm_vm_bugged(kvm); \
890 unlikely(__ret); \
891 })
892
893 #define KVM_BUG_ON(cond, kvm) \
894 ({ \
895 bool __ret = !!(cond); \
896 \
897 if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
898 kvm_vm_bugged(kvm); \
899 unlikely(__ret); \
900 })
901
902 /*
903 * Note, "data corruption" refers to corruption of host kernel data structures,
904 * not guest data. Guest data corruption, suspected or confirmed, that is tied
905 * and contained to a single VM should *never* BUG() and potentially panic the
906 * host, i.e. use this variant of KVM_BUG() if and only if a KVM data structure
907 * is corrupted and that corruption can have a cascading effect to other parts
908 * of the hosts and/or to other VMs.
909 */
910 #define KVM_BUG_ON_DATA_CORRUPTION(cond, kvm) \
911 ({ \
912 bool __ret = !!(cond); \
913 \
914 if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) \
915 BUG_ON(__ret); \
916 else if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
917 kvm_vm_bugged(kvm); \
918 unlikely(__ret); \
919 })
920
kvm_vcpu_srcu_read_lock(struct kvm_vcpu * vcpu)921 static inline void kvm_vcpu_srcu_read_lock(struct kvm_vcpu *vcpu)
922 {
923 #ifdef CONFIG_PROVE_RCU
924 WARN_ONCE(vcpu->srcu_depth++,
925 "KVM: Illegal vCPU srcu_idx LOCK, depth=%d", vcpu->srcu_depth - 1);
926 #endif
927 vcpu->____srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
928 }
929
kvm_vcpu_srcu_read_unlock(struct kvm_vcpu * vcpu)930 static inline void kvm_vcpu_srcu_read_unlock(struct kvm_vcpu *vcpu)
931 {
932 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->____srcu_idx);
933
934 #ifdef CONFIG_PROVE_RCU
935 WARN_ONCE(--vcpu->srcu_depth,
936 "KVM: Illegal vCPU srcu_idx UNLOCK, depth=%d", vcpu->srcu_depth);
937 #endif
938 }
939
kvm_dirty_log_manual_protect_and_init_set(struct kvm * kvm)940 static inline bool kvm_dirty_log_manual_protect_and_init_set(struct kvm *kvm)
941 {
942 return !!(kvm->manual_dirty_log_protect & KVM_DIRTY_LOG_INITIALLY_SET);
943 }
944
kvm_get_bus(struct kvm * kvm,enum kvm_bus idx)945 static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
946 {
947 return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
948 lockdep_is_held(&kvm->slots_lock) ||
949 !refcount_read(&kvm->users_count));
950 }
951
kvm_get_vcpu(struct kvm * kvm,int i)952 static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
953 {
954 int num_vcpus = atomic_read(&kvm->online_vcpus);
955 i = array_index_nospec(i, num_vcpus);
956
957 /* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu. */
958 smp_rmb();
959 return xa_load(&kvm->vcpu_array, i);
960 }
961
962 #define kvm_for_each_vcpu(idx, vcpup, kvm) \
963 xa_for_each_range(&kvm->vcpu_array, idx, vcpup, 0, \
964 (atomic_read(&kvm->online_vcpus) - 1))
965
kvm_get_vcpu_by_id(struct kvm * kvm,int id)966 static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
967 {
968 struct kvm_vcpu *vcpu = NULL;
969 unsigned long i;
970
971 if (id < 0)
972 return NULL;
973 if (id < KVM_MAX_VCPUS)
974 vcpu = kvm_get_vcpu(kvm, id);
975 if (vcpu && vcpu->vcpu_id == id)
976 return vcpu;
977 kvm_for_each_vcpu(i, vcpu, kvm)
978 if (vcpu->vcpu_id == id)
979 return vcpu;
980 return NULL;
981 }
982
983 void kvm_destroy_vcpus(struct kvm *kvm);
984
985 void vcpu_load(struct kvm_vcpu *vcpu);
986 void vcpu_put(struct kvm_vcpu *vcpu);
987
988 #ifdef __KVM_HAVE_IOAPIC
989 void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);
990 void kvm_arch_post_irq_routing_update(struct kvm *kvm);
991 #else
kvm_arch_post_irq_ack_notifier_list_update(struct kvm * kvm)992 static inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm)
993 {
994 }
kvm_arch_post_irq_routing_update(struct kvm * kvm)995 static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
996 {
997 }
998 #endif
999
1000 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1001 int kvm_irqfd_init(void);
1002 void kvm_irqfd_exit(void);
1003 #else
kvm_irqfd_init(void)1004 static inline int kvm_irqfd_init(void)
1005 {
1006 return 0;
1007 }
1008
kvm_irqfd_exit(void)1009 static inline void kvm_irqfd_exit(void)
1010 {
1011 }
1012 #endif
1013 int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module);
1014 void kvm_exit(void);
1015
1016 void kvm_get_kvm(struct kvm *kvm);
1017 bool kvm_get_kvm_safe(struct kvm *kvm);
1018 void kvm_put_kvm(struct kvm *kvm);
1019 bool file_is_kvm(struct file *file);
1020 void kvm_put_kvm_no_destroy(struct kvm *kvm);
1021
__kvm_memslots(struct kvm * kvm,int as_id)1022 static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
1023 {
1024 as_id = array_index_nospec(as_id, KVM_MAX_NR_ADDRESS_SPACES);
1025 return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
1026 lockdep_is_held(&kvm->slots_lock) ||
1027 !refcount_read(&kvm->users_count));
1028 }
1029
kvm_memslots(struct kvm * kvm)1030 static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
1031 {
1032 return __kvm_memslots(kvm, 0);
1033 }
1034
kvm_vcpu_memslots(struct kvm_vcpu * vcpu)1035 static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
1036 {
1037 int as_id = kvm_arch_vcpu_memslots_id(vcpu);
1038
1039 return __kvm_memslots(vcpu->kvm, as_id);
1040 }
1041
kvm_memslots_empty(struct kvm_memslots * slots)1042 static inline bool kvm_memslots_empty(struct kvm_memslots *slots)
1043 {
1044 return RB_EMPTY_ROOT(&slots->gfn_tree);
1045 }
1046
1047 bool kvm_are_all_memslots_empty(struct kvm *kvm);
1048
1049 #define kvm_for_each_memslot(memslot, bkt, slots) \
1050 hash_for_each(slots->id_hash, bkt, memslot, id_node[slots->node_idx]) \
1051 if (WARN_ON_ONCE(!memslot->npages)) { \
1052 } else
1053
1054 static inline
id_to_memslot(struct kvm_memslots * slots,int id)1055 struct kvm_memory_slot *id_to_memslot(struct kvm_memslots *slots, int id)
1056 {
1057 struct kvm_memory_slot *slot;
1058 int idx = slots->node_idx;
1059
1060 hash_for_each_possible(slots->id_hash, slot, id_node[idx], id) {
1061 if (slot->id == id)
1062 return slot;
1063 }
1064
1065 return NULL;
1066 }
1067
1068 /* Iterator used for walking memslots that overlap a gfn range. */
1069 struct kvm_memslot_iter {
1070 struct kvm_memslots *slots;
1071 struct rb_node *node;
1072 struct kvm_memory_slot *slot;
1073 };
1074
kvm_memslot_iter_next(struct kvm_memslot_iter * iter)1075 static inline void kvm_memslot_iter_next(struct kvm_memslot_iter *iter)
1076 {
1077 iter->node = rb_next(iter->node);
1078 if (!iter->node)
1079 return;
1080
1081 iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[iter->slots->node_idx]);
1082 }
1083
kvm_memslot_iter_start(struct kvm_memslot_iter * iter,struct kvm_memslots * slots,gfn_t start)1084 static inline void kvm_memslot_iter_start(struct kvm_memslot_iter *iter,
1085 struct kvm_memslots *slots,
1086 gfn_t start)
1087 {
1088 int idx = slots->node_idx;
1089 struct rb_node *tmp;
1090 struct kvm_memory_slot *slot;
1091
1092 iter->slots = slots;
1093
1094 /*
1095 * Find the so called "upper bound" of a key - the first node that has
1096 * its key strictly greater than the searched one (the start gfn in our case).
1097 */
1098 iter->node = NULL;
1099 for (tmp = slots->gfn_tree.rb_node; tmp; ) {
1100 slot = container_of(tmp, struct kvm_memory_slot, gfn_node[idx]);
1101 if (start < slot->base_gfn) {
1102 iter->node = tmp;
1103 tmp = tmp->rb_left;
1104 } else {
1105 tmp = tmp->rb_right;
1106 }
1107 }
1108
1109 /*
1110 * Find the slot with the lowest gfn that can possibly intersect with
1111 * the range, so we'll ideally have slot start <= range start
1112 */
1113 if (iter->node) {
1114 /*
1115 * A NULL previous node means that the very first slot
1116 * already has a higher start gfn.
1117 * In this case slot start > range start.
1118 */
1119 tmp = rb_prev(iter->node);
1120 if (tmp)
1121 iter->node = tmp;
1122 } else {
1123 /* a NULL node below means no slots */
1124 iter->node = rb_last(&slots->gfn_tree);
1125 }
1126
1127 if (iter->node) {
1128 iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[idx]);
1129
1130 /*
1131 * It is possible in the slot start < range start case that the
1132 * found slot ends before or at range start (slot end <= range start)
1133 * and so it does not overlap the requested range.
1134 *
1135 * In such non-overlapping case the next slot (if it exists) will
1136 * already have slot start > range start, otherwise the logic above
1137 * would have found it instead of the current slot.
1138 */
1139 if (iter->slot->base_gfn + iter->slot->npages <= start)
1140 kvm_memslot_iter_next(iter);
1141 }
1142 }
1143
kvm_memslot_iter_is_valid(struct kvm_memslot_iter * iter,gfn_t end)1144 static inline bool kvm_memslot_iter_is_valid(struct kvm_memslot_iter *iter, gfn_t end)
1145 {
1146 if (!iter->node)
1147 return false;
1148
1149 /*
1150 * If this slot starts beyond or at the end of the range so does
1151 * every next one
1152 */
1153 return iter->slot->base_gfn < end;
1154 }
1155
1156 /* Iterate over each memslot at least partially intersecting [start, end) range */
1157 #define kvm_for_each_memslot_in_gfn_range(iter, slots, start, end) \
1158 for (kvm_memslot_iter_start(iter, slots, start); \
1159 kvm_memslot_iter_is_valid(iter, end); \
1160 kvm_memslot_iter_next(iter))
1161
1162 /*
1163 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
1164 * - create a new memory slot
1165 * - delete an existing memory slot
1166 * - modify an existing memory slot
1167 * -- move it in the guest physical memory space
1168 * -- just change its flags
1169 *
1170 * Since flags can be changed by some of these operations, the following
1171 * differentiation is the best we can do for __kvm_set_memory_region():
1172 */
1173 enum kvm_mr_change {
1174 KVM_MR_CREATE,
1175 KVM_MR_DELETE,
1176 KVM_MR_MOVE,
1177 KVM_MR_FLAGS_ONLY,
1178 };
1179
1180 int kvm_set_memory_region(struct kvm *kvm,
1181 const struct kvm_userspace_memory_region2 *mem);
1182 int __kvm_set_memory_region(struct kvm *kvm,
1183 const struct kvm_userspace_memory_region2 *mem);
1184 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);
1185 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
1186 int kvm_arch_prepare_memory_region(struct kvm *kvm,
1187 const struct kvm_memory_slot *old,
1188 struct kvm_memory_slot *new,
1189 enum kvm_mr_change change);
1190 void kvm_arch_commit_memory_region(struct kvm *kvm,
1191 struct kvm_memory_slot *old,
1192 const struct kvm_memory_slot *new,
1193 enum kvm_mr_change change);
1194 /* flush all memory translations */
1195 void kvm_arch_flush_shadow_all(struct kvm *kvm);
1196 /* flush memory translations pointing to 'slot' */
1197 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
1198 struct kvm_memory_slot *slot);
1199
1200 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1201 struct page **pages, int nr_pages);
1202
1203 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
1204 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
1205 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
1206 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
1207 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
1208 bool *writable);
1209 void kvm_release_page_clean(struct page *page);
1210 void kvm_release_page_dirty(struct page *page);
1211
1212 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
1213 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1214 bool *writable);
1215 kvm_pfn_t gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn);
1216 kvm_pfn_t gfn_to_pfn_memslot_atomic(const struct kvm_memory_slot *slot, gfn_t gfn);
1217 kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn,
1218 bool atomic, bool interruptible, bool *async,
1219 bool write_fault, bool *writable, hva_t *hva);
1220
1221 void kvm_release_pfn_clean(kvm_pfn_t pfn);
1222 void kvm_release_pfn_dirty(kvm_pfn_t pfn);
1223 void kvm_set_pfn_dirty(kvm_pfn_t pfn);
1224 void kvm_set_pfn_accessed(kvm_pfn_t pfn);
1225
1226 void kvm_release_pfn(kvm_pfn_t pfn, bool dirty);
1227 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1228 int len);
1229 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
1230 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1231 void *data, unsigned long len);
1232 int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1233 void *data, unsigned int offset,
1234 unsigned long len);
1235 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1236 int offset, int len);
1237 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1238 unsigned long len);
1239 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1240 void *data, unsigned long len);
1241 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1242 void *data, unsigned int offset,
1243 unsigned long len);
1244 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1245 gpa_t gpa, unsigned long len);
1246
1247 #define __kvm_get_guest(kvm, gfn, offset, v) \
1248 ({ \
1249 unsigned long __addr = gfn_to_hva(kvm, gfn); \
1250 typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \
1251 int __ret = -EFAULT; \
1252 \
1253 if (!kvm_is_error_hva(__addr)) \
1254 __ret = get_user(v, __uaddr); \
1255 __ret; \
1256 })
1257
1258 #define kvm_get_guest(kvm, gpa, v) \
1259 ({ \
1260 gpa_t __gpa = gpa; \
1261 struct kvm *__kvm = kvm; \
1262 \
1263 __kvm_get_guest(__kvm, __gpa >> PAGE_SHIFT, \
1264 offset_in_page(__gpa), v); \
1265 })
1266
1267 #define __kvm_put_guest(kvm, gfn, offset, v) \
1268 ({ \
1269 unsigned long __addr = gfn_to_hva(kvm, gfn); \
1270 typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \
1271 int __ret = -EFAULT; \
1272 \
1273 if (!kvm_is_error_hva(__addr)) \
1274 __ret = put_user(v, __uaddr); \
1275 if (!__ret) \
1276 mark_page_dirty(kvm, gfn); \
1277 __ret; \
1278 })
1279
1280 #define kvm_put_guest(kvm, gpa, v) \
1281 ({ \
1282 gpa_t __gpa = gpa; \
1283 struct kvm *__kvm = kvm; \
1284 \
1285 __kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \
1286 offset_in_page(__gpa), v); \
1287 })
1288
1289 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
1290 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
1291 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
1292 bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);
1293 unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn);
1294 void mark_page_dirty_in_slot(struct kvm *kvm, const struct kvm_memory_slot *memslot, gfn_t gfn);
1295 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
1296
1297 struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
1298 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
1299 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
1300 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
1301 int kvm_vcpu_map(struct kvm_vcpu *vcpu, gpa_t gpa, struct kvm_host_map *map);
1302 void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty);
1303 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
1304 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
1305 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
1306 int len);
1307 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
1308 unsigned long len);
1309 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
1310 unsigned long len);
1311 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
1312 int offset, int len);
1313 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1314 unsigned long len);
1315 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
1316
1317 /**
1318 * kvm_gpc_init - initialize gfn_to_pfn_cache.
1319 *
1320 * @gpc: struct gfn_to_pfn_cache object.
1321 * @kvm: pointer to kvm instance.
1322 *
1323 * This sets up a gfn_to_pfn_cache by initializing locks and assigning the
1324 * immutable attributes. Note, the cache must be zero-allocated (or zeroed by
1325 * the caller before init).
1326 */
1327 void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm);
1328
1329 /**
1330 * kvm_gpc_activate - prepare a cached kernel mapping and HPA for a given guest
1331 * physical address.
1332 *
1333 * @gpc: struct gfn_to_pfn_cache object.
1334 * @gpa: guest physical address to map.
1335 * @len: sanity check; the range being access must fit a single page.
1336 *
1337 * @return: 0 for success.
1338 * -EINVAL for a mapping which would cross a page boundary.
1339 * -EFAULT for an untranslatable guest physical address.
1340 *
1341 * This primes a gfn_to_pfn_cache and links it into the @gpc->kvm's list for
1342 * invalidations to be processed. Callers are required to use kvm_gpc_check()
1343 * to ensure that the cache is valid before accessing the target page.
1344 */
1345 int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
1346
1347 /**
1348 * kvm_gpc_activate_hva - prepare a cached kernel mapping and HPA for a given HVA.
1349 *
1350 * @gpc: struct gfn_to_pfn_cache object.
1351 * @hva: userspace virtual address to map.
1352 * @len: sanity check; the range being access must fit a single page.
1353 *
1354 * @return: 0 for success.
1355 * -EINVAL for a mapping which would cross a page boundary.
1356 * -EFAULT for an untranslatable guest physical address.
1357 *
1358 * The semantics of this function are the same as those of kvm_gpc_activate(). It
1359 * merely bypasses a layer of address translation.
1360 */
1361 int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long hva, unsigned long len);
1362
1363 /**
1364 * kvm_gpc_check - check validity of a gfn_to_pfn_cache.
1365 *
1366 * @gpc: struct gfn_to_pfn_cache object.
1367 * @len: sanity check; the range being access must fit a single page.
1368 *
1369 * @return: %true if the cache is still valid and the address matches.
1370 * %false if the cache is not valid.
1371 *
1372 * Callers outside IN_GUEST_MODE context should hold a read lock on @gpc->lock
1373 * while calling this function, and then continue to hold the lock until the
1374 * access is complete.
1375 *
1376 * Callers in IN_GUEST_MODE may do so without locking, although they should
1377 * still hold a read lock on kvm->scru for the memslot checks.
1378 */
1379 bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len);
1380
1381 /**
1382 * kvm_gpc_refresh - update a previously initialized cache.
1383 *
1384 * @gpc: struct gfn_to_pfn_cache object.
1385 * @len: sanity check; the range being access must fit a single page.
1386 *
1387 * @return: 0 for success.
1388 * -EINVAL for a mapping which would cross a page boundary.
1389 * -EFAULT for an untranslatable guest physical address.
1390 *
1391 * This will attempt to refresh a gfn_to_pfn_cache. Note that a successful
1392 * return from this function does not mean the page can be immediately
1393 * accessed because it may have raced with an invalidation. Callers must
1394 * still lock and check the cache status, as this function does not return
1395 * with the lock still held to permit access.
1396 */
1397 int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len);
1398
1399 /**
1400 * kvm_gpc_deactivate - deactivate and unlink a gfn_to_pfn_cache.
1401 *
1402 * @gpc: struct gfn_to_pfn_cache object.
1403 *
1404 * This removes a cache from the VM's list to be processed on MMU notifier
1405 * invocation.
1406 */
1407 void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc);
1408
kvm_gpc_is_gpa_active(struct gfn_to_pfn_cache * gpc)1409 static inline bool kvm_gpc_is_gpa_active(struct gfn_to_pfn_cache *gpc)
1410 {
1411 return gpc->active && !kvm_is_error_gpa(gpc->gpa);
1412 }
1413
kvm_gpc_is_hva_active(struct gfn_to_pfn_cache * gpc)1414 static inline bool kvm_gpc_is_hva_active(struct gfn_to_pfn_cache *gpc)
1415 {
1416 return gpc->active && kvm_is_error_gpa(gpc->gpa);
1417 }
1418
1419 void kvm_sigset_activate(struct kvm_vcpu *vcpu);
1420 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
1421
1422 void kvm_vcpu_halt(struct kvm_vcpu *vcpu);
1423 bool kvm_vcpu_block(struct kvm_vcpu *vcpu);
1424 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
1425 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
1426 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
1427 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
1428 int kvm_vcpu_yield_to(struct kvm_vcpu *target);
1429 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode);
1430
1431 void kvm_flush_remote_tlbs(struct kvm *kvm);
1432 void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);
1433 void kvm_flush_remote_tlbs_memslot(struct kvm *kvm,
1434 const struct kvm_memory_slot *memslot);
1435
1436 #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
1437 int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min);
1438 int __kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int capacity, int min);
1439 int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc);
1440 void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc);
1441 void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
1442 #endif
1443
1444 void kvm_mmu_invalidate_begin(struct kvm *kvm);
1445 void kvm_mmu_invalidate_range_add(struct kvm *kvm, gfn_t start, gfn_t end);
1446 void kvm_mmu_invalidate_end(struct kvm *kvm);
1447 bool kvm_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
1448
1449 long kvm_arch_dev_ioctl(struct file *filp,
1450 unsigned int ioctl, unsigned long arg);
1451 long kvm_arch_vcpu_ioctl(struct file *filp,
1452 unsigned int ioctl, unsigned long arg);
1453 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
1454
1455 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
1456
1457 void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
1458 struct kvm_memory_slot *slot,
1459 gfn_t gfn_offset,
1460 unsigned long mask);
1461 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot);
1462
1463 #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1464 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log);
1465 int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log,
1466 int *is_dirty, struct kvm_memory_slot **memslot);
1467 #endif
1468
1469 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
1470 bool line_status);
1471 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
1472 struct kvm_enable_cap *cap);
1473 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);
1474 long kvm_arch_vm_compat_ioctl(struct file *filp, unsigned int ioctl,
1475 unsigned long arg);
1476
1477 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
1478 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
1479
1480 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1481 struct kvm_translation *tr);
1482
1483 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
1484 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
1485 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1486 struct kvm_sregs *sregs);
1487 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1488 struct kvm_sregs *sregs);
1489 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
1490 struct kvm_mp_state *mp_state);
1491 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
1492 struct kvm_mp_state *mp_state);
1493 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
1494 struct kvm_guest_debug *dbg);
1495 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu);
1496
1497 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
1498
1499 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
1500 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
1501 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
1502 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);
1503 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
1504 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
1505
1506 #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
1507 int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state);
1508 #endif
1509
1510 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
1511 void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry);
1512 #else
kvm_create_vcpu_debugfs(struct kvm_vcpu * vcpu)1513 static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
1514 #endif
1515
1516 #ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
1517 int kvm_arch_hardware_enable(void);
1518 void kvm_arch_hardware_disable(void);
1519 #endif
1520 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
1521 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
1522 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
1523 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu);
1524 bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu);
1525 bool kvm_arch_vcpu_preempted_in_kernel(struct kvm_vcpu *vcpu);
1526 int kvm_arch_post_init_vm(struct kvm *kvm);
1527 void kvm_arch_pre_destroy_vm(struct kvm *kvm);
1528 void kvm_arch_create_vm_debugfs(struct kvm *kvm);
1529
1530 #ifndef __KVM_HAVE_ARCH_VM_ALLOC
1531 /*
1532 * All architectures that want to use vzalloc currently also
1533 * need their own kvm_arch_alloc_vm implementation.
1534 */
kvm_arch_alloc_vm(void)1535 static inline struct kvm *kvm_arch_alloc_vm(void)
1536 {
1537 return kzalloc(sizeof(struct kvm), GFP_KERNEL_ACCOUNT);
1538 }
1539 #endif
1540
__kvm_arch_free_vm(struct kvm * kvm)1541 static inline void __kvm_arch_free_vm(struct kvm *kvm)
1542 {
1543 kvfree(kvm);
1544 }
1545
1546 #ifndef __KVM_HAVE_ARCH_VM_FREE
kvm_arch_free_vm(struct kvm * kvm)1547 static inline void kvm_arch_free_vm(struct kvm *kvm)
1548 {
1549 __kvm_arch_free_vm(kvm);
1550 }
1551 #endif
1552
1553 #ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
kvm_arch_flush_remote_tlbs(struct kvm * kvm)1554 static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
1555 {
1556 return -ENOTSUPP;
1557 }
1558 #else
1559 int kvm_arch_flush_remote_tlbs(struct kvm *kvm);
1560 #endif
1561
1562 #ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
kvm_arch_flush_remote_tlbs_range(struct kvm * kvm,gfn_t gfn,u64 nr_pages)1563 static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm,
1564 gfn_t gfn, u64 nr_pages)
1565 {
1566 return -EOPNOTSUPP;
1567 }
1568 #else
1569 int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);
1570 #endif
1571
1572 #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
1573 void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
1574 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
1575 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
1576 #else
kvm_arch_register_noncoherent_dma(struct kvm * kvm)1577 static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
1578 {
1579 }
1580
kvm_arch_unregister_noncoherent_dma(struct kvm * kvm)1581 static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
1582 {
1583 }
1584
kvm_arch_has_noncoherent_dma(struct kvm * kvm)1585 static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
1586 {
1587 return false;
1588 }
1589 #endif
1590 #ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
1591 void kvm_arch_start_assignment(struct kvm *kvm);
1592 void kvm_arch_end_assignment(struct kvm *kvm);
1593 bool kvm_arch_has_assigned_device(struct kvm *kvm);
1594 #else
kvm_arch_start_assignment(struct kvm * kvm)1595 static inline void kvm_arch_start_assignment(struct kvm *kvm)
1596 {
1597 }
1598
kvm_arch_end_assignment(struct kvm * kvm)1599 static inline void kvm_arch_end_assignment(struct kvm *kvm)
1600 {
1601 }
1602
kvm_arch_has_assigned_device(struct kvm * kvm)1603 static __always_inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
1604 {
1605 return false;
1606 }
1607 #endif
1608
kvm_arch_vcpu_get_wait(struct kvm_vcpu * vcpu)1609 static inline struct rcuwait *kvm_arch_vcpu_get_wait(struct kvm_vcpu *vcpu)
1610 {
1611 #ifdef __KVM_HAVE_ARCH_WQP
1612 return vcpu->arch.waitp;
1613 #else
1614 return &vcpu->wait;
1615 #endif
1616 }
1617
1618 /*
1619 * Wake a vCPU if necessary, but don't do any stats/metadata updates. Returns
1620 * true if the vCPU was blocking and was awakened, false otherwise.
1621 */
__kvm_vcpu_wake_up(struct kvm_vcpu * vcpu)1622 static inline bool __kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
1623 {
1624 return !!rcuwait_wake_up(kvm_arch_vcpu_get_wait(vcpu));
1625 }
1626
kvm_vcpu_is_blocking(struct kvm_vcpu * vcpu)1627 static inline bool kvm_vcpu_is_blocking(struct kvm_vcpu *vcpu)
1628 {
1629 return rcuwait_active(kvm_arch_vcpu_get_wait(vcpu));
1630 }
1631
1632 #ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
1633 /*
1634 * returns true if the virtual interrupt controller is initialized and
1635 * ready to accept virtual IRQ. On some architectures the virtual interrupt
1636 * controller is dynamically instantiated and this is not always true.
1637 */
1638 bool kvm_arch_intc_initialized(struct kvm *kvm);
1639 #else
kvm_arch_intc_initialized(struct kvm * kvm)1640 static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
1641 {
1642 return true;
1643 }
1644 #endif
1645
1646 #ifdef CONFIG_GUEST_PERF_EVENTS
1647 unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu);
1648
1649 void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void));
1650 void kvm_unregister_perf_callbacks(void);
1651 #else
kvm_register_perf_callbacks(void * ign)1652 static inline void kvm_register_perf_callbacks(void *ign) {}
kvm_unregister_perf_callbacks(void)1653 static inline void kvm_unregister_perf_callbacks(void) {}
1654 #endif /* CONFIG_GUEST_PERF_EVENTS */
1655
1656 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
1657 void kvm_arch_destroy_vm(struct kvm *kvm);
1658 void kvm_arch_sync_events(struct kvm *kvm);
1659
1660 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
1661
1662 struct page *kvm_pfn_to_refcounted_page(kvm_pfn_t pfn);
1663 bool kvm_is_zone_device_page(struct page *page);
1664
1665 struct kvm_irq_ack_notifier {
1666 struct hlist_node link;
1667 unsigned gsi;
1668 void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
1669 };
1670
1671 int kvm_irq_map_gsi(struct kvm *kvm,
1672 struct kvm_kernel_irq_routing_entry *entries, int gsi);
1673 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
1674
1675 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
1676 bool line_status);
1677 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
1678 int irq_source_id, int level, bool line_status);
1679 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
1680 struct kvm *kvm, int irq_source_id,
1681 int level, bool line_status);
1682 bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
1683 void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
1684 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
1685 void kvm_register_irq_ack_notifier(struct kvm *kvm,
1686 struct kvm_irq_ack_notifier *kian);
1687 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
1688 struct kvm_irq_ack_notifier *kian);
1689 int kvm_request_irq_source_id(struct kvm *kvm);
1690 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
1691 bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
1692
1693 /*
1694 * Returns a pointer to the memslot if it contains gfn.
1695 * Otherwise returns NULL.
1696 */
1697 static inline struct kvm_memory_slot *
try_get_memslot(struct kvm_memory_slot * slot,gfn_t gfn)1698 try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1699 {
1700 if (!slot)
1701 return NULL;
1702
1703 if (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages)
1704 return slot;
1705 else
1706 return NULL;
1707 }
1708
1709 /*
1710 * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
1711 *
1712 * With "approx" set returns the memslot also when the address falls
1713 * in a hole. In that case one of the memslots bordering the hole is
1714 * returned.
1715 */
1716 static inline struct kvm_memory_slot *
search_memslots(struct kvm_memslots * slots,gfn_t gfn,bool approx)1717 search_memslots(struct kvm_memslots *slots, gfn_t gfn, bool approx)
1718 {
1719 struct kvm_memory_slot *slot;
1720 struct rb_node *node;
1721 int idx = slots->node_idx;
1722
1723 slot = NULL;
1724 for (node = slots->gfn_tree.rb_node; node; ) {
1725 slot = container_of(node, struct kvm_memory_slot, gfn_node[idx]);
1726 if (gfn >= slot->base_gfn) {
1727 if (gfn < slot->base_gfn + slot->npages)
1728 return slot;
1729 node = node->rb_right;
1730 } else
1731 node = node->rb_left;
1732 }
1733
1734 return approx ? slot : NULL;
1735 }
1736
1737 static inline struct kvm_memory_slot *
____gfn_to_memslot(struct kvm_memslots * slots,gfn_t gfn,bool approx)1738 ____gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn, bool approx)
1739 {
1740 struct kvm_memory_slot *slot;
1741
1742 slot = (struct kvm_memory_slot *)atomic_long_read(&slots->last_used_slot);
1743 slot = try_get_memslot(slot, gfn);
1744 if (slot)
1745 return slot;
1746
1747 slot = search_memslots(slots, gfn, approx);
1748 if (slot) {
1749 atomic_long_set(&slots->last_used_slot, (unsigned long)slot);
1750 return slot;
1751 }
1752
1753 return NULL;
1754 }
1755
1756 /*
1757 * __gfn_to_memslot() and its descendants are here to allow arch code to inline
1758 * the lookups in hot paths. gfn_to_memslot() itself isn't here as an inline
1759 * because that would bloat other code too much.
1760 */
1761 static inline struct kvm_memory_slot *
__gfn_to_memslot(struct kvm_memslots * slots,gfn_t gfn)1762 __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
1763 {
1764 return ____gfn_to_memslot(slots, gfn, false);
1765 }
1766
1767 static inline unsigned long
__gfn_to_hva_memslot(const struct kvm_memory_slot * slot,gfn_t gfn)1768 __gfn_to_hva_memslot(const struct kvm_memory_slot *slot, gfn_t gfn)
1769 {
1770 /*
1771 * The index was checked originally in search_memslots. To avoid
1772 * that a malicious guest builds a Spectre gadget out of e.g. page
1773 * table walks, do not let the processor speculate loads outside
1774 * the guest's registered memslots.
1775 */
1776 unsigned long offset = gfn - slot->base_gfn;
1777 offset = array_index_nospec(offset, slot->npages);
1778 return slot->userspace_addr + offset * PAGE_SIZE;
1779 }
1780
memslot_id(struct kvm * kvm,gfn_t gfn)1781 static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
1782 {
1783 return gfn_to_memslot(kvm, gfn)->id;
1784 }
1785
1786 static inline gfn_t
hva_to_gfn_memslot(unsigned long hva,struct kvm_memory_slot * slot)1787 hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
1788 {
1789 gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
1790
1791 return slot->base_gfn + gfn_offset;
1792 }
1793
gfn_to_gpa(gfn_t gfn)1794 static inline gpa_t gfn_to_gpa(gfn_t gfn)
1795 {
1796 return (gpa_t)gfn << PAGE_SHIFT;
1797 }
1798
gpa_to_gfn(gpa_t gpa)1799 static inline gfn_t gpa_to_gfn(gpa_t gpa)
1800 {
1801 return (gfn_t)(gpa >> PAGE_SHIFT);
1802 }
1803
pfn_to_hpa(kvm_pfn_t pfn)1804 static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
1805 {
1806 return (hpa_t)pfn << PAGE_SHIFT;
1807 }
1808
kvm_is_gpa_in_memslot(struct kvm * kvm,gpa_t gpa)1809 static inline bool kvm_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa)
1810 {
1811 unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
1812
1813 return !kvm_is_error_hva(hva);
1814 }
1815
kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache * gpc)1816 static inline void kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache *gpc)
1817 {
1818 lockdep_assert_held(&gpc->lock);
1819
1820 if (!gpc->memslot)
1821 return;
1822
1823 mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpa_to_gfn(gpc->gpa));
1824 }
1825
1826 enum kvm_stat_kind {
1827 KVM_STAT_VM,
1828 KVM_STAT_VCPU,
1829 };
1830
1831 struct kvm_stat_data {
1832 struct kvm *kvm;
1833 const struct _kvm_stats_desc *desc;
1834 enum kvm_stat_kind kind;
1835 };
1836
1837 struct _kvm_stats_desc {
1838 struct kvm_stats_desc desc;
1839 char name[KVM_STATS_NAME_SIZE];
1840 };
1841
1842 #define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \
1843 .flags = type | unit | base | \
1844 BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \
1845 BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \
1846 BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \
1847 .exponent = exp, \
1848 .size = sz, \
1849 .bucket_size = bsz
1850
1851 #define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1852 { \
1853 { \
1854 STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1855 .offset = offsetof(struct kvm_vm_stat, generic.stat) \
1856 }, \
1857 .name = #stat, \
1858 }
1859 #define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1860 { \
1861 { \
1862 STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1863 .offset = offsetof(struct kvm_vcpu_stat, generic.stat) \
1864 }, \
1865 .name = #stat, \
1866 }
1867 #define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1868 { \
1869 { \
1870 STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1871 .offset = offsetof(struct kvm_vm_stat, stat) \
1872 }, \
1873 .name = #stat, \
1874 }
1875 #define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1876 { \
1877 { \
1878 STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1879 .offset = offsetof(struct kvm_vcpu_stat, stat) \
1880 }, \
1881 .name = #stat, \
1882 }
1883 /* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */
1884 #define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz) \
1885 SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
1886
1887 #define STATS_DESC_CUMULATIVE(SCOPE, name, unit, base, exponent) \
1888 STATS_DESC(SCOPE, name, KVM_STATS_TYPE_CUMULATIVE, \
1889 unit, base, exponent, 1, 0)
1890 #define STATS_DESC_INSTANT(SCOPE, name, unit, base, exponent) \
1891 STATS_DESC(SCOPE, name, KVM_STATS_TYPE_INSTANT, \
1892 unit, base, exponent, 1, 0)
1893 #define STATS_DESC_PEAK(SCOPE, name, unit, base, exponent) \
1894 STATS_DESC(SCOPE, name, KVM_STATS_TYPE_PEAK, \
1895 unit, base, exponent, 1, 0)
1896 #define STATS_DESC_LINEAR_HIST(SCOPE, name, unit, base, exponent, sz, bsz) \
1897 STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LINEAR_HIST, \
1898 unit, base, exponent, sz, bsz)
1899 #define STATS_DESC_LOG_HIST(SCOPE, name, unit, base, exponent, sz) \
1900 STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LOG_HIST, \
1901 unit, base, exponent, sz, 0)
1902
1903 /* Cumulative counter, read/write */
1904 #define STATS_DESC_COUNTER(SCOPE, name) \
1905 STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_NONE, \
1906 KVM_STATS_BASE_POW10, 0)
1907 /* Instantaneous counter, read only */
1908 #define STATS_DESC_ICOUNTER(SCOPE, name) \
1909 STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_NONE, \
1910 KVM_STATS_BASE_POW10, 0)
1911 /* Peak counter, read/write */
1912 #define STATS_DESC_PCOUNTER(SCOPE, name) \
1913 STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_NONE, \
1914 KVM_STATS_BASE_POW10, 0)
1915
1916 /* Instantaneous boolean value, read only */
1917 #define STATS_DESC_IBOOLEAN(SCOPE, name) \
1918 STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \
1919 KVM_STATS_BASE_POW10, 0)
1920 /* Peak (sticky) boolean value, read/write */
1921 #define STATS_DESC_PBOOLEAN(SCOPE, name) \
1922 STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \
1923 KVM_STATS_BASE_POW10, 0)
1924
1925 /* Cumulative time in nanosecond */
1926 #define STATS_DESC_TIME_NSEC(SCOPE, name) \
1927 STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1928 KVM_STATS_BASE_POW10, -9)
1929 /* Linear histogram for time in nanosecond */
1930 #define STATS_DESC_LINHIST_TIME_NSEC(SCOPE, name, sz, bsz) \
1931 STATS_DESC_LINEAR_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1932 KVM_STATS_BASE_POW10, -9, sz, bsz)
1933 /* Logarithmic histogram for time in nanosecond */
1934 #define STATS_DESC_LOGHIST_TIME_NSEC(SCOPE, name, sz) \
1935 STATS_DESC_LOG_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1936 KVM_STATS_BASE_POW10, -9, sz)
1937
1938 #define KVM_GENERIC_VM_STATS() \
1939 STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \
1940 STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests)
1941
1942 #define KVM_GENERIC_VCPU_STATS() \
1943 STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
1944 STATS_DESC_COUNTER(VCPU_GENERIC, halt_attempted_poll), \
1945 STATS_DESC_COUNTER(VCPU_GENERIC, halt_poll_invalid), \
1946 STATS_DESC_COUNTER(VCPU_GENERIC, halt_wakeup), \
1947 STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_success_ns), \
1948 STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns), \
1949 STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_wait_ns), \
1950 STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_success_hist, \
1951 HALT_POLL_HIST_COUNT), \
1952 STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_hist, \
1953 HALT_POLL_HIST_COUNT), \
1954 STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_wait_hist, \
1955 HALT_POLL_HIST_COUNT), \
1956 STATS_DESC_IBOOLEAN(VCPU_GENERIC, blocking)
1957
1958 extern struct dentry *kvm_debugfs_dir;
1959
1960 ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
1961 const struct _kvm_stats_desc *desc,
1962 void *stats, size_t size_stats,
1963 char __user *user_buffer, size_t size, loff_t *offset);
1964
1965 /**
1966 * kvm_stats_linear_hist_update() - Update bucket value for linear histogram
1967 * statistics data.
1968 *
1969 * @data: start address of the stats data
1970 * @size: the number of bucket of the stats data
1971 * @value: the new value used to update the linear histogram's bucket
1972 * @bucket_size: the size (width) of a bucket
1973 */
kvm_stats_linear_hist_update(u64 * data,size_t size,u64 value,size_t bucket_size)1974 static inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
1975 u64 value, size_t bucket_size)
1976 {
1977 size_t index = div64_u64(value, bucket_size);
1978
1979 index = min(index, size - 1);
1980 ++data[index];
1981 }
1982
1983 /**
1984 * kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram
1985 * statistics data.
1986 *
1987 * @data: start address of the stats data
1988 * @size: the number of bucket of the stats data
1989 * @value: the new value used to update the logarithmic histogram's bucket
1990 */
kvm_stats_log_hist_update(u64 * data,size_t size,u64 value)1991 static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
1992 {
1993 size_t index = fls64(value);
1994
1995 index = min(index, size - 1);
1996 ++data[index];
1997 }
1998
1999 #define KVM_STATS_LINEAR_HIST_UPDATE(array, value, bsize) \
2000 kvm_stats_linear_hist_update(array, ARRAY_SIZE(array), value, bsize)
2001 #define KVM_STATS_LOG_HIST_UPDATE(array, value) \
2002 kvm_stats_log_hist_update(array, ARRAY_SIZE(array), value)
2003
2004
2005 extern const struct kvm_stats_header kvm_vm_stats_header;
2006 extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
2007 extern const struct kvm_stats_header kvm_vcpu_stats_header;
2008 extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
2009
2010 #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
mmu_invalidate_retry(struct kvm * kvm,unsigned long mmu_seq)2011 static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
2012 {
2013 if (unlikely(kvm->mmu_invalidate_in_progress))
2014 return 1;
2015 /*
2016 * Ensure the read of mmu_invalidate_in_progress happens before
2017 * the read of mmu_invalidate_seq. This interacts with the
2018 * smp_wmb() in mmu_notifier_invalidate_range_end to make sure
2019 * that the caller either sees the old (non-zero) value of
2020 * mmu_invalidate_in_progress or the new (incremented) value of
2021 * mmu_invalidate_seq.
2022 *
2023 * PowerPC Book3s HV KVM calls this under a per-page lock rather
2024 * than under kvm->mmu_lock, for scalability, so can't rely on
2025 * kvm->mmu_lock to keep things ordered.
2026 */
2027 smp_rmb();
2028 if (kvm->mmu_invalidate_seq != mmu_seq)
2029 return 1;
2030 return 0;
2031 }
2032
mmu_invalidate_retry_gfn(struct kvm * kvm,unsigned long mmu_seq,gfn_t gfn)2033 static inline int mmu_invalidate_retry_gfn(struct kvm *kvm,
2034 unsigned long mmu_seq,
2035 gfn_t gfn)
2036 {
2037 lockdep_assert_held(&kvm->mmu_lock);
2038 /*
2039 * If mmu_invalidate_in_progress is non-zero, then the range maintained
2040 * by kvm_mmu_notifier_invalidate_range_start contains all addresses
2041 * that might be being invalidated. Note that it may include some false
2042 * positives, due to shortcuts when handing concurrent invalidations.
2043 */
2044 if (unlikely(kvm->mmu_invalidate_in_progress)) {
2045 /*
2046 * Dropping mmu_lock after bumping mmu_invalidate_in_progress
2047 * but before updating the range is a KVM bug.
2048 */
2049 if (WARN_ON_ONCE(kvm->mmu_invalidate_range_start == INVALID_GPA ||
2050 kvm->mmu_invalidate_range_end == INVALID_GPA))
2051 return 1;
2052
2053 if (gfn >= kvm->mmu_invalidate_range_start &&
2054 gfn < kvm->mmu_invalidate_range_end)
2055 return 1;
2056 }
2057
2058 if (kvm->mmu_invalidate_seq != mmu_seq)
2059 return 1;
2060 return 0;
2061 }
2062
2063 /*
2064 * This lockless version of the range-based retry check *must* be paired with a
2065 * call to the locked version after acquiring mmu_lock, i.e. this is safe to
2066 * use only as a pre-check to avoid contending mmu_lock. This version *will*
2067 * get false negatives and false positives.
2068 */
mmu_invalidate_retry_gfn_unsafe(struct kvm * kvm,unsigned long mmu_seq,gfn_t gfn)2069 static inline bool mmu_invalidate_retry_gfn_unsafe(struct kvm *kvm,
2070 unsigned long mmu_seq,
2071 gfn_t gfn)
2072 {
2073 /*
2074 * Use READ_ONCE() to ensure the in-progress flag and sequence counter
2075 * are always read from memory, e.g. so that checking for retry in a
2076 * loop won't result in an infinite retry loop. Don't force loads for
2077 * start+end, as the key to avoiding infinite retry loops is observing
2078 * the 1=>0 transition of in-progress, i.e. getting false negatives
2079 * due to stale start+end values is acceptable.
2080 */
2081 if (unlikely(READ_ONCE(kvm->mmu_invalidate_in_progress)) &&
2082 gfn >= kvm->mmu_invalidate_range_start &&
2083 gfn < kvm->mmu_invalidate_range_end)
2084 return true;
2085
2086 return READ_ONCE(kvm->mmu_invalidate_seq) != mmu_seq;
2087 }
2088 #endif
2089
2090 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2091
2092 #define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
2093
2094 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
2095 int kvm_set_irq_routing(struct kvm *kvm,
2096 const struct kvm_irq_routing_entry *entries,
2097 unsigned nr,
2098 unsigned flags);
2099 int kvm_set_routing_entry(struct kvm *kvm,
2100 struct kvm_kernel_irq_routing_entry *e,
2101 const struct kvm_irq_routing_entry *ue);
2102 void kvm_free_irq_routing(struct kvm *kvm);
2103
2104 #else
2105
kvm_free_irq_routing(struct kvm * kvm)2106 static inline void kvm_free_irq_routing(struct kvm *kvm) {}
2107
2108 #endif
2109
2110 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
2111
2112 void kvm_eventfd_init(struct kvm *kvm);
2113 int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
2114
2115 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2116 int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
2117 void kvm_irqfd_release(struct kvm *kvm);
2118 bool kvm_notify_irqfd_resampler(struct kvm *kvm,
2119 unsigned int irqchip,
2120 unsigned int pin);
2121 void kvm_irq_routing_update(struct kvm *);
2122 #else
kvm_irqfd(struct kvm * kvm,struct kvm_irqfd * args)2123 static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
2124 {
2125 return -EINVAL;
2126 }
2127
kvm_irqfd_release(struct kvm * kvm)2128 static inline void kvm_irqfd_release(struct kvm *kvm) {}
2129
kvm_notify_irqfd_resampler(struct kvm * kvm,unsigned int irqchip,unsigned int pin)2130 static inline bool kvm_notify_irqfd_resampler(struct kvm *kvm,
2131 unsigned int irqchip,
2132 unsigned int pin)
2133 {
2134 return false;
2135 }
2136 #endif /* CONFIG_HAVE_KVM_IRQCHIP */
2137
2138 void kvm_arch_irq_routing_update(struct kvm *kvm);
2139
__kvm_make_request(int req,struct kvm_vcpu * vcpu)2140 static inline void __kvm_make_request(int req, struct kvm_vcpu *vcpu)
2141 {
2142 /*
2143 * Ensure the rest of the request is published to kvm_check_request's
2144 * caller. Paired with the smp_mb__after_atomic in kvm_check_request.
2145 */
2146 smp_wmb();
2147 set_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
2148 }
2149
kvm_make_request(int req,struct kvm_vcpu * vcpu)2150 static __always_inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
2151 {
2152 /*
2153 * Request that don't require vCPU action should never be logged in
2154 * vcpu->requests. The vCPU won't clear the request, so it will stay
2155 * logged indefinitely and prevent the vCPU from entering the guest.
2156 */
2157 BUILD_BUG_ON(!__builtin_constant_p(req) ||
2158 (req & KVM_REQUEST_NO_ACTION));
2159
2160 __kvm_make_request(req, vcpu);
2161 }
2162
kvm_request_pending(struct kvm_vcpu * vcpu)2163 static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
2164 {
2165 return READ_ONCE(vcpu->requests);
2166 }
2167
kvm_test_request(int req,struct kvm_vcpu * vcpu)2168 static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
2169 {
2170 return test_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
2171 }
2172
kvm_clear_request(int req,struct kvm_vcpu * vcpu)2173 static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
2174 {
2175 clear_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
2176 }
2177
kvm_check_request(int req,struct kvm_vcpu * vcpu)2178 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
2179 {
2180 if (kvm_test_request(req, vcpu)) {
2181 kvm_clear_request(req, vcpu);
2182
2183 /*
2184 * Ensure the rest of the request is visible to kvm_check_request's
2185 * caller. Paired with the smp_wmb in kvm_make_request.
2186 */
2187 smp_mb__after_atomic();
2188 return true;
2189 } else {
2190 return false;
2191 }
2192 }
2193
2194 #ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
2195 extern bool kvm_rebooting;
2196 #endif
2197
2198 extern unsigned int halt_poll_ns;
2199 extern unsigned int halt_poll_ns_grow;
2200 extern unsigned int halt_poll_ns_grow_start;
2201 extern unsigned int halt_poll_ns_shrink;
2202
2203 struct kvm_device {
2204 const struct kvm_device_ops *ops;
2205 struct kvm *kvm;
2206 void *private;
2207 struct list_head vm_node;
2208 };
2209
2210 /* create, destroy, and name are mandatory */
2211 struct kvm_device_ops {
2212 const char *name;
2213
2214 /*
2215 * create is called holding kvm->lock and any operations not suitable
2216 * to do while holding the lock should be deferred to init (see
2217 * below).
2218 */
2219 int (*create)(struct kvm_device *dev, u32 type);
2220
2221 /*
2222 * init is called after create if create is successful and is called
2223 * outside of holding kvm->lock.
2224 */
2225 void (*init)(struct kvm_device *dev);
2226
2227 /*
2228 * Destroy is responsible for freeing dev.
2229 *
2230 * Destroy may be called before or after destructors are called
2231 * on emulated I/O regions, depending on whether a reference is
2232 * held by a vcpu or other kvm component that gets destroyed
2233 * after the emulated I/O.
2234 */
2235 void (*destroy)(struct kvm_device *dev);
2236
2237 /*
2238 * Release is an alternative method to free the device. It is
2239 * called when the device file descriptor is closed. Once
2240 * release is called, the destroy method will not be called
2241 * anymore as the device is removed from the device list of
2242 * the VM. kvm->lock is held.
2243 */
2244 void (*release)(struct kvm_device *dev);
2245
2246 int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2247 int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2248 int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2249 long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
2250 unsigned long arg);
2251 int (*mmap)(struct kvm_device *dev, struct vm_area_struct *vma);
2252 };
2253
2254 struct kvm_device *kvm_device_from_filp(struct file *filp);
2255 int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type);
2256 void kvm_unregister_device_ops(u32 type);
2257
2258 extern struct kvm_device_ops kvm_mpic_ops;
2259 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
2260 extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
2261
2262 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2263
kvm_vcpu_set_in_spin_loop(struct kvm_vcpu * vcpu,bool val)2264 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
2265 {
2266 vcpu->spin_loop.in_spin_loop = val;
2267 }
kvm_vcpu_set_dy_eligible(struct kvm_vcpu * vcpu,bool val)2268 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
2269 {
2270 vcpu->spin_loop.dy_eligible = val;
2271 }
2272
2273 #else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
2274
kvm_vcpu_set_in_spin_loop(struct kvm_vcpu * vcpu,bool val)2275 static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
2276 {
2277 }
2278
kvm_vcpu_set_dy_eligible(struct kvm_vcpu * vcpu,bool val)2279 static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
2280 {
2281 }
2282 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
2283
kvm_is_visible_memslot(struct kvm_memory_slot * memslot)2284 static inline bool kvm_is_visible_memslot(struct kvm_memory_slot *memslot)
2285 {
2286 return (memslot && memslot->id < KVM_USER_MEM_SLOTS &&
2287 !(memslot->flags & KVM_MEMSLOT_INVALID));
2288 }
2289
2290 struct kvm_vcpu *kvm_get_running_vcpu(void);
2291 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
2292
2293 #ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
2294 bool kvm_arch_has_irq_bypass(void);
2295 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
2296 struct irq_bypass_producer *);
2297 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
2298 struct irq_bypass_producer *);
2299 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
2300 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
2301 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
2302 uint32_t guest_irq, bool set);
2303 bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *,
2304 struct kvm_kernel_irq_routing_entry *);
2305 #endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
2306
2307 #ifdef CONFIG_HAVE_KVM_INVALID_WAKEUPS
2308 /* If we wakeup during the poll time, was it a sucessful poll? */
vcpu_valid_wakeup(struct kvm_vcpu * vcpu)2309 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
2310 {
2311 return vcpu->valid_wakeup;
2312 }
2313
2314 #else
vcpu_valid_wakeup(struct kvm_vcpu * vcpu)2315 static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
2316 {
2317 return true;
2318 }
2319 #endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
2320
2321 #ifdef CONFIG_HAVE_KVM_NO_POLL
2322 /* Callback that tells if we must not poll */
2323 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu);
2324 #else
kvm_arch_no_poll(struct kvm_vcpu * vcpu)2325 static inline bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
2326 {
2327 return false;
2328 }
2329 #endif /* CONFIG_HAVE_KVM_NO_POLL */
2330
2331 #ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
2332 long kvm_arch_vcpu_async_ioctl(struct file *filp,
2333 unsigned int ioctl, unsigned long arg);
2334 #else
kvm_arch_vcpu_async_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)2335 static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
2336 unsigned int ioctl,
2337 unsigned long arg)
2338 {
2339 return -ENOIOCTLCMD;
2340 }
2341 #endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
2342
2343 void kvm_arch_guest_memory_reclaimed(struct kvm *kvm);
2344
2345 #ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE
2346 int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);
2347 #else
kvm_arch_vcpu_run_pid_change(struct kvm_vcpu * vcpu)2348 static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
2349 {
2350 return 0;
2351 }
2352 #endif /* CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE */
2353
2354 typedef int (*kvm_vm_thread_fn_t)(struct kvm *kvm, uintptr_t data);
2355
2356 int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn,
2357 uintptr_t data, const char *name,
2358 struct task_struct **thread_ptr);
2359
2360 #ifdef CONFIG_KVM_XFER_TO_GUEST_WORK
kvm_handle_signal_exit(struct kvm_vcpu * vcpu)2361 static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
2362 {
2363 vcpu->run->exit_reason = KVM_EXIT_INTR;
2364 vcpu->stat.signal_exits++;
2365 }
2366 #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
2367
2368 /*
2369 * If more than one page is being (un)accounted, @virt must be the address of
2370 * the first page of a block of pages what were allocated together (i.e
2371 * accounted together).
2372 *
2373 * kvm_account_pgtable_pages() is thread-safe because mod_lruvec_page_state()
2374 * is thread-safe.
2375 */
kvm_account_pgtable_pages(void * virt,int nr)2376 static inline void kvm_account_pgtable_pages(void *virt, int nr)
2377 {
2378 mod_lruvec_page_state(virt_to_page(virt), NR_SECONDARY_PAGETABLE, nr);
2379 }
2380
2381 /*
2382 * This defines how many reserved entries we want to keep before we
2383 * kick the vcpu to the userspace to avoid dirty ring full. This
2384 * value can be tuned to higher if e.g. PML is enabled on the host.
2385 */
2386 #define KVM_DIRTY_RING_RSVD_ENTRIES 64
2387
2388 /* Max number of entries allowed for each kvm dirty ring */
2389 #define KVM_DIRTY_RING_MAX_ENTRIES 65536
2390
kvm_prepare_memory_fault_exit(struct kvm_vcpu * vcpu,gpa_t gpa,gpa_t size,bool is_write,bool is_exec,bool is_private)2391 static inline void kvm_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
2392 gpa_t gpa, gpa_t size,
2393 bool is_write, bool is_exec,
2394 bool is_private)
2395 {
2396 vcpu->run->exit_reason = KVM_EXIT_MEMORY_FAULT;
2397 vcpu->run->memory_fault.gpa = gpa;
2398 vcpu->run->memory_fault.size = size;
2399
2400 /* RWX flags are not (yet) defined or communicated to userspace. */
2401 vcpu->run->memory_fault.flags = 0;
2402 if (is_private)
2403 vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_PRIVATE;
2404 }
2405
2406 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
kvm_get_memory_attributes(struct kvm * kvm,gfn_t gfn)2407 static inline unsigned long kvm_get_memory_attributes(struct kvm *kvm, gfn_t gfn)
2408 {
2409 return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));
2410 }
2411
2412 bool kvm_range_has_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
2413 unsigned long attrs);
2414 bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
2415 struct kvm_gfn_range *range);
2416 bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
2417 struct kvm_gfn_range *range);
2418
kvm_mem_is_private(struct kvm * kvm,gfn_t gfn)2419 static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
2420 {
2421 return IS_ENABLED(CONFIG_KVM_PRIVATE_MEM) &&
2422 kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE;
2423 }
2424 #else
kvm_mem_is_private(struct kvm * kvm,gfn_t gfn)2425 static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
2426 {
2427 return false;
2428 }
2429 #endif /* CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES */
2430
2431 #ifdef CONFIG_KVM_PRIVATE_MEM
2432 int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot,
2433 gfn_t gfn, kvm_pfn_t *pfn, int *max_order);
2434 #else
kvm_gmem_get_pfn(struct kvm * kvm,struct kvm_memory_slot * slot,gfn_t gfn,kvm_pfn_t * pfn,int * max_order)2435 static inline int kvm_gmem_get_pfn(struct kvm *kvm,
2436 struct kvm_memory_slot *slot, gfn_t gfn,
2437 kvm_pfn_t *pfn, int *max_order)
2438 {
2439 KVM_BUG_ON(1, kvm);
2440 return -EIO;
2441 }
2442 #endif /* CONFIG_KVM_PRIVATE_MEM */
2443
2444 #endif
2445