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_ADDRESS_SPACE_NUM
84	#define KVM_ADDRESS_SPACE_NUM 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	*/
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	*/
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	*/
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. */
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
144	static inline bool kvm_is_error_hva(unsigned long addr)
145	{
146	return addr >= PAGE_OFFSET;
147	}
148
149	#endif
150
151	#define KVM_ERR_PTR_BAD_PAGE (ERR_PTR(-ENOENT))
152
153	static inline bool is_error_page(struct page *page)
154	{
155	return IS_ERR(ptr: page);
156	}
157
158	#define KVM_REQUEST_MASK GENMASK(7,0)
159	#define KVM_REQUEST_NO_WAKEUP BIT(8)
160	#define KVM_REQUEST_WAIT BIT(9)
161	#define KVM_REQUEST_NO_ACTION BIT(10)
162	/*
163	* Architecture-independent vcpu->requests bit members
164	* Bits 3-7 are reserved for more arch-independent bits.
165	*/
166	#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
167	#define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
168	#define KVM_REQ_UNBLOCK 2
169	#define KVM_REQ_DIRTY_RING_SOFT_FULL 3
170	#define KVM_REQUEST_ARCH_BASE 8
171
172	/*
173	* KVM_REQ_OUTSIDE_GUEST_MODE exists is purely as way to force the vCPU to
174	* OUTSIDE_GUEST_MODE. KVM_REQ_OUTSIDE_GUEST_MODE differs from a vCPU "kick"
175	* in that it ensures the vCPU has reached OUTSIDE_GUEST_MODE before continuing
176	* on. A kick only guarantees that the vCPU is on its way out, e.g. a previous
177	* kick may have set vcpu->mode to EXITING_GUEST_MODE, and so there's no
178	* guarantee the vCPU received an IPI and has actually exited guest mode.
179	*/
180	#define KVM_REQ_OUTSIDE_GUEST_MODE (KVM_REQUEST_NO_ACTION | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
181
182	#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
183	BUILD_BUG_ON((unsigned)(nr) >= (sizeof_field(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \
184	(unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
185	})
186	#define KVM_ARCH_REQ(nr) KVM_ARCH_REQ_FLAGS(nr, 0)
187
188	bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
189	unsigned long *vcpu_bitmap);
190	bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
191	bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
192	struct kvm_vcpu *except);
193
194	#define KVM_USERSPACE_IRQ_SOURCE_ID 0
195	#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
196
197	extern struct mutex kvm_lock;
198	extern struct list_head vm_list;
199
200	struct kvm_io_range {
201	gpa_t addr;
202	int len;
203	struct kvm_io_device *dev;
204	};
205
206	#define NR_IOBUS_DEVS 1000
207
208	struct kvm_io_bus {
209	int dev_count;
210	int ioeventfd_count;
211	struct kvm_io_range range[];
212	};
213
214	enum kvm_bus {
215	KVM_MMIO_BUS,
216	KVM_PIO_BUS,
217	KVM_VIRTIO_CCW_NOTIFY_BUS,
218	KVM_FAST_MMIO_BUS,
219	KVM_NR_BUSES
220	};
221
222	int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
223	int len, const void *val);
224	int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
225	gpa_t addr, int len, const void *val, long cookie);
226	int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
227	int len, void *val);
228	int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
229	int len, struct kvm_io_device *dev);
230	int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
231	struct kvm_io_device *dev);
232	struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
233	gpa_t addr);
234
235	#ifdef CONFIG_KVM_ASYNC_PF
236	struct kvm_async_pf {
237	struct work_struct work;
238	struct list_head link;
239	struct list_head queue;
240	struct kvm_vcpu *vcpu;
241	struct mm_struct *mm;
242	gpa_t cr2_or_gpa;
243	unsigned long addr;
244	struct kvm_arch_async_pf arch;
245	bool wakeup_all;
246	bool notpresent_injected;
247	};
248
249	void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
250	void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
251	bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
252	unsigned long hva, struct kvm_arch_async_pf *arch);
253	int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
254	#endif
255
256	#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
257	union kvm_mmu_notifier_arg {
258	pte_t pte;
259	};
260
261	struct kvm_gfn_range {
262	struct kvm_memory_slot *slot;
263	gfn_t start;
264	gfn_t end;
265	union kvm_mmu_notifier_arg arg;
266	bool may_block;
267	};
268	bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
269	bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
270	bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
271	bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
272	#endif
273
274	enum {
275	OUTSIDE_GUEST_MODE,
276	IN_GUEST_MODE,
277	EXITING_GUEST_MODE,
278	READING_SHADOW_PAGE_TABLES,
279	};
280
281	#define KVM_UNMAPPED_PAGE ((void *) 0x500 + POISON_POINTER_DELTA)
282
283	struct kvm_host_map {
284	/*
285	* Only valid if the 'pfn' is managed by the host kernel (i.e. There is
286	* a 'struct page' for it. When using mem= kernel parameter some memory
287	* can be used as guest memory but they are not managed by host
288	* kernel).
289	* If 'pfn' is not managed by the host kernel, this field is
290	* initialized to KVM_UNMAPPED_PAGE.
291	*/
292	struct page *page;
293	void *hva;
294	kvm_pfn_t pfn;
295	kvm_pfn_t gfn;
296	};
297
298	/*
299	* Used to check if the mapping is valid or not. Never use 'kvm_host_map'
300	* directly to check for that.
301	*/
302	static inline bool kvm_vcpu_mapped(struct kvm_host_map *map)
303	{
304	return !!map->hva;
305	}
306
307	static inline bool kvm_vcpu_can_poll(ktime_t cur, ktime_t stop)
308	{
309	return single_task_running() && !need_resched() && ktime_before(cmp1: cur, cmp2: stop);
310	}
311
312	/*
313	* Sometimes a large or cross-page mmio needs to be broken up into separate
314	* exits for userspace servicing.
315	*/
316	struct kvm_mmio_fragment {
317	gpa_t gpa;
318	void *data;
319	unsigned len;
320	};
321
322	struct kvm_vcpu {
323	struct kvm *kvm;
324	#ifdef CONFIG_PREEMPT_NOTIFIERS
325	struct preempt_notifier preempt_notifier;
326	#endif
327	int cpu;
328	int vcpu_id; /* id given by userspace at creation */
329	int vcpu_idx; /* index into kvm->vcpu_array */
330	int ____srcu_idx; /* Don't use this directly. You've been warned. */
331	#ifdef CONFIG_PROVE_RCU
332	int srcu_depth;
333	#endif
334	int mode;
335	u64 requests;
336	unsigned long guest_debug;
337
338	struct mutex mutex;
339	struct kvm_run *run;
340
341	#ifndef __KVM_HAVE_ARCH_WQP
342	struct rcuwait wait;
343	#endif
344	struct pid __rcu *pid;
345	int sigset_active;
346	sigset_t sigset;
347	unsigned int halt_poll_ns;
348	bool valid_wakeup;
349
350	#ifdef CONFIG_HAS_IOMEM
351	int mmio_needed;
352	int mmio_read_completed;
353	int mmio_is_write;
354	int mmio_cur_fragment;
355	int mmio_nr_fragments;
356	struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
357	#endif
358
359	#ifdef CONFIG_KVM_ASYNC_PF
360	struct {
361	u32 queued;
362	struct list_head queue;
363	struct list_head done;
364	spinlock_t lock;
365	} async_pf;
366	#endif
367
368	#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
369	/*
370	* Cpu relax intercept or pause loop exit optimization
371	* in_spin_loop: set when a vcpu does a pause loop exit
372	* or cpu relax intercepted.
373	* dy_eligible: indicates whether vcpu is eligible for directed yield.
374	*/
375	struct {
376	bool in_spin_loop;
377	bool dy_eligible;
378	} spin_loop;
379	#endif
380	bool preempted;
381	bool ready;
382	struct kvm_vcpu_arch arch;
383	struct kvm_vcpu_stat stat;
384	char stats_id[KVM_STATS_NAME_SIZE];
385	struct kvm_dirty_ring dirty_ring;
386
387	/*
388	* The most recently used memslot by this vCPU and the slots generation
389	* for which it is valid.
390	* No wraparound protection is needed since generations won't overflow in
391	* thousands of years, even assuming 1M memslot operations per second.
392	*/
393	struct kvm_memory_slot *last_used_slot;
394	u64 last_used_slot_gen;
395	};
396
397	/*
398	* Start accounting time towards a guest.
399	* Must be called before entering guest context.
400	*/
401	static __always_inline void guest_timing_enter_irqoff(void)
402	{
403	/*
404	* This is running in ioctl context so its safe to assume that it's the
405	* stime pending cputime to flush.
406	*/
407	instrumentation_begin();
408	vtime_account_guest_enter();
409	instrumentation_end();
410	}
411
412	/*
413	* Enter guest context and enter an RCU extended quiescent state.
414	*
415	* Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is
416	* unsafe to use any code which may directly or indirectly use RCU, tracing
417	* (including IRQ flag tracing), or lockdep. All code in this period must be
418	* non-instrumentable.
419	*/
420	static __always_inline void guest_context_enter_irqoff(void)
421	{
422	/*
423	* KVM does not hold any references to rcu protected data when it
424	* switches CPU into a guest mode. In fact switching to a guest mode
425	* is very similar to exiting to userspace from rcu point of view. In
426	* addition CPU may stay in a guest mode for quite a long time (up to
427	* one time slice). Lets treat guest mode as quiescent state, just like
428	* we do with user-mode execution.
429	*/
430	if (!context_tracking_guest_enter()) {
431	instrumentation_begin();
432	rcu_virt_note_context_switch();
433	instrumentation_end();
434	}
435	}
436
437	/*
438	* Deprecated. Architectures should move to guest_timing_enter_irqoff() and
439	* guest_state_enter_irqoff().
440	*/
441	static __always_inline void guest_enter_irqoff(void)
442	{
443	guest_timing_enter_irqoff();
444	guest_context_enter_irqoff();
445	}
446
447	/**
448	* guest_state_enter_irqoff - Fixup state when entering a guest
449	*
450	* Entry to a guest will enable interrupts, but the kernel state is interrupts
451	* disabled when this is invoked. Also tell RCU about it.
452	*
453	* 1) Trace interrupts on state
454	* 2) Invoke context tracking if enabled to adjust RCU state
455	* 3) Tell lockdep that interrupts are enabled
456	*
457	* Invoked from architecture specific code before entering a guest.
458	* Must be called with interrupts disabled and the caller must be
459	* non-instrumentable.
460	* The caller has to invoke guest_timing_enter_irqoff() before this.
461	*
462	* Note: this is analogous to exit_to_user_mode().
463	*/
464	static __always_inline void guest_state_enter_irqoff(void)
465	{
466	instrumentation_begin();
467	trace_hardirqs_on_prepare();
468	lockdep_hardirqs_on_prepare();
469	instrumentation_end();
470
471	guest_context_enter_irqoff();
472	lockdep_hardirqs_on(CALLER_ADDR0);
473	}
474
475	/*
476	* Exit guest context and exit an RCU extended quiescent state.
477	*
478	* Between guest_context_enter_irqoff() and guest_context_exit_irqoff() it is
479	* unsafe to use any code which may directly or indirectly use RCU, tracing
480	* (including IRQ flag tracing), or lockdep. All code in this period must be
481	* non-instrumentable.
482	*/
483	static __always_inline void guest_context_exit_irqoff(void)
484	{
485	context_tracking_guest_exit();
486	}
487
488	/*
489	* Stop accounting time towards a guest.
490	* Must be called after exiting guest context.
491	*/
492	static __always_inline void guest_timing_exit_irqoff(void)
493	{
494	instrumentation_begin();
495	/* Flush the guest cputime we spent on the guest */
496	vtime_account_guest_exit();
497	instrumentation_end();
498	}
499
500	/*
501	* Deprecated. Architectures should move to guest_state_exit_irqoff() and
502	* guest_timing_exit_irqoff().
503	*/
504	static __always_inline void guest_exit_irqoff(void)
505	{
506	guest_context_exit_irqoff();
507	guest_timing_exit_irqoff();
508	}
509
510	static inline void guest_exit(void)
511	{
512	unsigned long flags;
513
514	local_irq_save(flags);
515	guest_exit_irqoff();
516	local_irq_restore(flags);
517	}
518
519	/**
520	* guest_state_exit_irqoff - Establish state when returning from guest mode
521	*
522	* Entry from a guest disables interrupts, but guest mode is traced as
523	* interrupts enabled. Also with NO_HZ_FULL RCU might be idle.
524	*
525	* 1) Tell lockdep that interrupts are disabled
526	* 2) Invoke context tracking if enabled to reactivate RCU
527	* 3) Trace interrupts off state
528	*
529	* Invoked from architecture specific code after exiting a guest.
530	* Must be invoked with interrupts disabled and the caller must be
531	* non-instrumentable.
532	* The caller has to invoke guest_timing_exit_irqoff() after this.
533	*
534	* Note: this is analogous to enter_from_user_mode().
535	*/
536	static __always_inline void guest_state_exit_irqoff(void)
537	{
538	lockdep_hardirqs_off(CALLER_ADDR0);
539	guest_context_exit_irqoff();
540
541	instrumentation_begin();
542	trace_hardirqs_off_finish();
543	instrumentation_end();
544	}
545
546	static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
547	{
548	/*
549	* The memory barrier ensures a previous write to vcpu->requests cannot
550	* be reordered with the read of vcpu->mode. It pairs with the general
551	* memory barrier following the write of vcpu->mode in VCPU RUN.
552	*/
553	smp_mb__before_atomic();
554	return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
555	}
556
557	/*
558	* Some of the bitops functions do not support too long bitmaps.
559	* This number must be determined not to exceed such limits.
560	*/
561	#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
562
563	/*
564	* Since at idle each memslot belongs to two memslot sets it has to contain
565	* two embedded nodes for each data structure that it forms a part of.
566	*
567	* Two memslot sets (one active and one inactive) are necessary so the VM
568	* continues to run on one memslot set while the other is being modified.
569	*
570	* These two memslot sets normally point to the same set of memslots.
571	* They can, however, be desynchronized when performing a memslot management
572	* operation by replacing the memslot to be modified by its copy.
573	* After the operation is complete, both memslot sets once again point to
574	* the same, common set of memslot data.
575	*
576	* The memslots themselves are independent of each other so they can be
577	* individually added or deleted.
578	*/
579	struct kvm_memory_slot {
580	struct hlist_node id_node[2];
581	struct interval_tree_node hva_node[2];
582	struct rb_node gfn_node[2];
583	gfn_t base_gfn;
584	unsigned long npages;
585	unsigned long *dirty_bitmap;
586	struct kvm_arch_memory_slot arch;
587	unsigned long userspace_addr;
588	u32 flags;
589	short id;
590	u16 as_id;
591	};
592
593	static inline bool kvm_slot_dirty_track_enabled(const struct kvm_memory_slot *slot)
594	{
595	return slot->flags & KVM_MEM_LOG_DIRTY_PAGES;
596	}
597
598	static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
599	{
600	return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
601	}
602
603	static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot)
604	{
605	unsigned long len = kvm_dirty_bitmap_bytes(memslot);
606
607	return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
608	}
609
610	#ifndef KVM_DIRTY_LOG_MANUAL_CAPS
611	#define KVM_DIRTY_LOG_MANUAL_CAPS KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
612	#endif
613
614	struct kvm_s390_adapter_int {
615	u64 ind_addr;
616	u64 summary_addr;
617	u64 ind_offset;
618	u32 summary_offset;
619	u32 adapter_id;
620	};
621
622	struct kvm_hv_sint {
623	u32 vcpu;
624	u32 sint;
625	};
626
627	struct kvm_xen_evtchn {
628	u32 port;
629	u32 vcpu_id;
630	int vcpu_idx;
631	u32 priority;
632	};
633
634	struct kvm_kernel_irq_routing_entry {
635	u32 gsi;
636	u32 type;
637	int (*set)(struct kvm_kernel_irq_routing_entry *e,
638	struct kvm *kvm, int irq_source_id, int level,
639	bool line_status);
640	union {
641	struct {
642	unsigned irqchip;
643	unsigned pin;
644	} irqchip;
645	struct {
646	u32 address_lo;
647	u32 address_hi;
648	u32 data;
649	u32 flags;
650	u32 devid;
651	} msi;
652	struct kvm_s390_adapter_int adapter;
653	struct kvm_hv_sint hv_sint;
654	struct kvm_xen_evtchn xen_evtchn;
655	};
656	struct hlist_node link;
657	};
658
659	#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
660	struct kvm_irq_routing_table {
661	int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
662	u32 nr_rt_entries;
663	/*
664	* Array indexed by gsi. Each entry contains list of irq chips
665	* the gsi is connected to.
666	*/
667	struct hlist_head map[] __counted_by(nr_rt_entries);
668	};
669	#endif
670
671	bool kvm_arch_irqchip_in_kernel(struct kvm *kvm);
672
673	#ifndef KVM_INTERNAL_MEM_SLOTS
674	#define KVM_INTERNAL_MEM_SLOTS 0
675	#endif
676
677	#define KVM_MEM_SLOTS_NUM SHRT_MAX
678	#define KVM_USER_MEM_SLOTS (KVM_MEM_SLOTS_NUM - KVM_INTERNAL_MEM_SLOTS)
679
680	#ifndef __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
681	static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
682	{
683	return 0;
684	}
685	#endif
686
687	struct kvm_memslots {
688	u64 generation;
689	atomic_long_t last_used_slot;
690	struct rb_root_cached hva_tree;
691	struct rb_root gfn_tree;
692	/*
693	* The mapping table from slot id to memslot.
694	*
695	* 7-bit bucket count matches the size of the old id to index array for
696	* 512 slots, while giving good performance with this slot count.
697	* Higher bucket counts bring only small performance improvements but
698	* always result in higher memory usage (even for lower memslot counts).
699	*/
700	DECLARE_HASHTABLE(id_hash, 7);
701	int node_idx;
702	};
703
704	struct kvm {
705	#ifdef KVM_HAVE_MMU_RWLOCK
706	rwlock_t mmu_lock;
707	#else
708	spinlock_t mmu_lock;
709	#endif /* KVM_HAVE_MMU_RWLOCK */
710
711	struct mutex slots_lock;
712
713	/*
714	* Protects the arch-specific fields of struct kvm_memory_slots in
715	* use by the VM. To be used under the slots_lock (above) or in a
716	* kvm->srcu critical section where acquiring the slots_lock would
717	* lead to deadlock with the synchronize_srcu in
718	* kvm_swap_active_memslots().
719	*/
720	struct mutex slots_arch_lock;
721	struct mm_struct *mm; /* userspace tied to this vm */
722	unsigned long nr_memslot_pages;
723	/* The two memslot sets - active and inactive (per address space) */
724	struct kvm_memslots __memslots[KVM_ADDRESS_SPACE_NUM][2];
725	/* The current active memslot set for each address space */
726	struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
727	struct xarray vcpu_array;
728	/*
729	* Protected by slots_lock, but can be read outside if an
730	* incorrect answer is acceptable.
731	*/
732	atomic_t nr_memslots_dirty_logging;
733
734	/* Used to wait for completion of MMU notifiers. */
735	spinlock_t mn_invalidate_lock;
736	unsigned long mn_active_invalidate_count;
737	struct rcuwait mn_memslots_update_rcuwait;
738
739	/* For management / invalidation of gfn_to_pfn_caches */
740	spinlock_t gpc_lock;
741	struct list_head gpc_list;
742
743	/*
744	* created_vcpus is protected by kvm->lock, and is incremented
745	* at the beginning of KVM_CREATE_VCPU. online_vcpus is only
746	* incremented after storing the kvm_vcpu pointer in vcpus,
747	* and is accessed atomically.
748	*/
749	atomic_t online_vcpus;
750	int max_vcpus;
751	int created_vcpus;
752	int last_boosted_vcpu;
753	struct list_head vm_list;
754	struct mutex lock;
755	struct kvm_io_bus __rcu *buses[KVM_NR_BUSES];
756	#ifdef CONFIG_HAVE_KVM_EVENTFD
757	struct {
758	spinlock_t lock;
759	struct list_head items;
760	/* resampler_list update side is protected by resampler_lock. */
761	struct list_head resampler_list;
762	struct mutex resampler_lock;
763	} irqfds;
764	struct list_head ioeventfds;
765	#endif
766	struct kvm_vm_stat stat;
767	struct kvm_arch arch;
768	refcount_t users_count;
769	#ifdef CONFIG_KVM_MMIO
770	struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
771	spinlock_t ring_lock;
772	struct list_head coalesced_zones;
773	#endif
774
775	struct mutex irq_lock;
776	#ifdef CONFIG_HAVE_KVM_IRQCHIP
777	/*
778	* Update side is protected by irq_lock.
779	*/
780	struct kvm_irq_routing_table __rcu *irq_routing;
781	#endif
782	#ifdef CONFIG_HAVE_KVM_IRQFD
783	struct hlist_head irq_ack_notifier_list;
784	#endif
785
786	#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
787	struct mmu_notifier mmu_notifier;
788	unsigned long mmu_invalidate_seq;
789	long mmu_invalidate_in_progress;
790	unsigned long mmu_invalidate_range_start;
791	unsigned long mmu_invalidate_range_end;
792	#endif
793	struct list_head devices;
794	u64 manual_dirty_log_protect;
795	struct dentry *debugfs_dentry;
796	struct kvm_stat_data **debugfs_stat_data;
797	struct srcu_struct srcu;
798	struct srcu_struct irq_srcu;
799	pid_t userspace_pid;
800	bool override_halt_poll_ns;
801	unsigned int max_halt_poll_ns;
802	u32 dirty_ring_size;
803	bool dirty_ring_with_bitmap;
804	bool vm_bugged;
805	bool vm_dead;
806
807	#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
808	struct notifier_block pm_notifier;
809	#endif
810	char stats_id[KVM_STATS_NAME_SIZE];
811	};
812
813	#define kvm_err(fmt, ...) \
814	pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
815	#define kvm_info(fmt, ...) \
816	pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
817	#define kvm_debug(fmt, ...) \
818	pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
819	#define kvm_debug_ratelimited(fmt, ...) \
820	pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \
821	## __VA_ARGS__)
822	#define kvm_pr_unimpl(fmt, ...) \
823	pr_err_ratelimited("kvm [%i]: " fmt, \
824	task_tgid_nr(current), ## __VA_ARGS__)
825
826	/* The guest did something we don't support. */
827	#define vcpu_unimpl(vcpu, fmt, ...) \
828	kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt, \
829	(vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
830
831	#define vcpu_debug(vcpu, fmt, ...) \
832	kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
833	#define vcpu_debug_ratelimited(vcpu, fmt, ...) \
834	kvm_debug_ratelimited("vcpu%i " fmt, (vcpu)->vcpu_id, \
835	## __VA_ARGS__)
836	#define vcpu_err(vcpu, fmt, ...) \
837	kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
838
839	static inline void kvm_vm_dead(struct kvm *kvm)
840	{
841	kvm->vm_dead = true;
842	kvm_make_all_cpus_request(kvm, KVM_REQ_VM_DEAD);
843	}
844
845	static inline void kvm_vm_bugged(struct kvm *kvm)
846	{
847	kvm->vm_bugged = true;
848	kvm_vm_dead(kvm);
849	}
850
851
852	#define KVM_BUG(cond, kvm, fmt...) \
853	({ \
854	bool __ret = !!(cond); \
855	\
856	if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \
857	kvm_vm_bugged(kvm); \
858	unlikely(__ret); \
859	})
860
861	#define KVM_BUG_ON(cond, kvm) \
862	({ \
863	bool __ret = !!(cond); \
864	\
865	if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
866	kvm_vm_bugged(kvm); \
867	unlikely(__ret); \
868	})
869
870	/*
871	* Note, "data corruption" refers to corruption of host kernel data structures,
872	* not guest data. Guest data corruption, suspected or confirmed, that is tied
873	* and contained to a single VM should *never* BUG() and potentially panic the
874	* host, i.e. use this variant of KVM_BUG() if and only if a KVM data structure
875	* is corrupted and that corruption can have a cascading effect to other parts
876	* of the hosts and/or to other VMs.
877	*/
878	#define KVM_BUG_ON_DATA_CORRUPTION(cond, kvm) \
879	({ \
880	bool __ret = !!(cond); \
881	\
882	if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) \
883	BUG_ON(__ret); \
884	else if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
885	kvm_vm_bugged(kvm); \
886	unlikely(__ret); \
887	})
888
889	static inline void kvm_vcpu_srcu_read_lock(struct kvm_vcpu *vcpu)
890	{
891	#ifdef CONFIG_PROVE_RCU
892	WARN_ONCE(vcpu->srcu_depth++,
893	"KVM: Illegal vCPU srcu_idx LOCK, depth=%d", vcpu->srcu_depth - 1);
894	#endif
895	vcpu->____srcu_idx = srcu_read_lock(ssp: &vcpu->kvm->srcu);
896	}
897
898	static inline void kvm_vcpu_srcu_read_unlock(struct kvm_vcpu *vcpu)
899	{
900	srcu_read_unlock(ssp: &vcpu->kvm->srcu, idx: vcpu->____srcu_idx);
901
902	#ifdef CONFIG_PROVE_RCU
903	WARN_ONCE(--vcpu->srcu_depth,
904	"KVM: Illegal vCPU srcu_idx UNLOCK, depth=%d", vcpu->srcu_depth);
905	#endif
906	}
907
908	static inline bool kvm_dirty_log_manual_protect_and_init_set(struct kvm *kvm)
909	{
910	return !!(kvm->manual_dirty_log_protect & KVM_DIRTY_LOG_INITIALLY_SET);
911	}
912
913	static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
914	{
915	return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
916	lockdep_is_held(&kvm->slots_lock) ||
917	!refcount_read(&kvm->users_count));
918	}
919
920	static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
921	{
922	int num_vcpus = atomic_read(v: &kvm->online_vcpus);
923	i = array_index_nospec(i, num_vcpus);
924
925	/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu. */
926	smp_rmb();
927	return xa_load(&kvm->vcpu_array, index: i);
928	}
929
930	#define kvm_for_each_vcpu(idx, vcpup, kvm) \
931	xa_for_each_range(&kvm->vcpu_array, idx, vcpup, 0, \
932	(atomic_read(&kvm->online_vcpus) - 1))
933
934	static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
935	{
936	struct kvm_vcpu *vcpu = NULL;
937	unsigned long i;
938
939	if (id < 0)
940	return NULL;
941	if (id < KVM_MAX_VCPUS)
942	vcpu = kvm_get_vcpu(kvm, i: id);
943	if (vcpu && vcpu->vcpu_id == id)
944	return vcpu;
945	kvm_for_each_vcpu(i, vcpu, kvm)
946	if (vcpu->vcpu_id == id)
947	return vcpu;
948	return NULL;
949	}
950
951	void kvm_destroy_vcpus(struct kvm *kvm);
952
953	void vcpu_load(struct kvm_vcpu *vcpu);
954	void vcpu_put(struct kvm_vcpu *vcpu);
955
956	#ifdef __KVM_HAVE_IOAPIC
957	void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);
958	void kvm_arch_post_irq_routing_update(struct kvm *kvm);
959	#else
960	static inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm)
961	{
962	}
963	static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
964	{
965	}
966	#endif
967
968	#ifdef CONFIG_HAVE_KVM_IRQFD
969	int kvm_irqfd_init(void);
970	void kvm_irqfd_exit(void);
971	#else
972	static inline int kvm_irqfd_init(void)
973	{
974	return 0;
975	}
976
977	static inline void kvm_irqfd_exit(void)
978	{
979	}
980	#endif
981	int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module);
982	void kvm_exit(void);
983
984	void kvm_get_kvm(struct kvm *kvm);
985	bool kvm_get_kvm_safe(struct kvm *kvm);
986	void kvm_put_kvm(struct kvm *kvm);
987	bool file_is_kvm(struct file *file);
988	void kvm_put_kvm_no_destroy(struct kvm *kvm);
989
990	static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
991	{
992	as_id = array_index_nospec(as_id, KVM_ADDRESS_SPACE_NUM);
993	return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
994	lockdep_is_held(&kvm->slots_lock) ||
995	!refcount_read(&kvm->users_count));
996	}
997
998	static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
999	{
1000	return __kvm_memslots(kvm, as_id: 0);
1001	}
1002
1003	static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
1004	{
1005	int as_id = kvm_arch_vcpu_memslots_id(vcpu);
1006
1007	return __kvm_memslots(kvm: vcpu->kvm, as_id);
1008	}
1009
1010	static inline bool kvm_memslots_empty(struct kvm_memslots *slots)
1011	{
1012	return RB_EMPTY_ROOT(&slots->gfn_tree);
1013	}
1014
1015	bool kvm_are_all_memslots_empty(struct kvm *kvm);
1016
1017	#define kvm_for_each_memslot(memslot, bkt, slots) \
1018	hash_for_each(slots->id_hash, bkt, memslot, id_node[slots->node_idx]) \
1019	if (WARN_ON_ONCE(!memslot->npages)) { \
1020	} else
1021
1022	static inline
1023	struct kvm_memory_slot *id_to_memslot(struct kvm_memslots *slots, int id)
1024	{
1025	struct kvm_memory_slot *slot;
1026	int idx = slots->node_idx;
1027
1028	hash_for_each_possible(slots->id_hash, slot, id_node[idx], id) {
1029	if (slot->id == id)
1030	return slot;
1031	}
1032
1033	return NULL;
1034	}
1035
1036	/* Iterator used for walking memslots that overlap a gfn range. */
1037	struct kvm_memslot_iter {
1038	struct kvm_memslots *slots;
1039	struct rb_node *node;
1040	struct kvm_memory_slot *slot;
1041	};
1042
1043	static inline void kvm_memslot_iter_next(struct kvm_memslot_iter *iter)
1044	{
1045	iter->node = rb_next(iter->node);
1046	if (!iter->node)
1047	return;
1048
1049	iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[iter->slots->node_idx]);
1050	}
1051
1052	static inline void kvm_memslot_iter_start(struct kvm_memslot_iter *iter,
1053	struct kvm_memslots *slots,
1054	gfn_t start)
1055	{
1056	int idx = slots->node_idx;
1057	struct rb_node *tmp;
1058	struct kvm_memory_slot *slot;
1059
1060	iter->slots = slots;
1061
1062	/*
1063	* Find the so called "upper bound" of a key - the first node that has
1064	* its key strictly greater than the searched one (the start gfn in our case).
1065	*/
1066	iter->node = NULL;
1067	for (tmp = slots->gfn_tree.rb_node; tmp; ) {
1068	slot = container_of(tmp, struct kvm_memory_slot, gfn_node[idx]);
1069	if (start < slot->base_gfn) {
1070	iter->node = tmp;
1071	tmp = tmp->rb_left;
1072	} else {
1073	tmp = tmp->rb_right;
1074	}
1075	}
1076
1077	/*
1078	* Find the slot with the lowest gfn that can possibly intersect with
1079	* the range, so we'll ideally have slot start <= range start
1080	*/
1081	if (iter->node) {
1082	/*
1083	* A NULL previous node means that the very first slot
1084	* already has a higher start gfn.
1085	* In this case slot start > range start.
1086	*/
1087	tmp = rb_prev(iter->node);
1088	if (tmp)
1089	iter->node = tmp;
1090	} else {
1091	/* a NULL node below means no slots */
1092	iter->node = rb_last(&slots->gfn_tree);
1093	}
1094
1095	if (iter->node) {
1096	iter->slot = container_of(iter->node, struct kvm_memory_slot, gfn_node[idx]);
1097
1098	/*
1099	* It is possible in the slot start < range start case that the
1100	* found slot ends before or at range start (slot end <= range start)
1101	* and so it does not overlap the requested range.
1102	*
1103	* In such non-overlapping case the next slot (if it exists) will
1104	* already have slot start > range start, otherwise the logic above
1105	* would have found it instead of the current slot.
1106	*/
1107	if (iter->slot->base_gfn + iter->slot->npages <= start)
1108	kvm_memslot_iter_next(iter);
1109	}
1110	}
1111
1112	static inline bool kvm_memslot_iter_is_valid(struct kvm_memslot_iter *iter, gfn_t end)
1113	{
1114	if (!iter->node)
1115	return false;
1116
1117	/*
1118	* If this slot starts beyond or at the end of the range so does
1119	* every next one
1120	*/
1121	return iter->slot->base_gfn < end;
1122	}
1123
1124	/* Iterate over each memslot at least partially intersecting [start, end) range */
1125	#define kvm_for_each_memslot_in_gfn_range(iter, slots, start, end) \
1126	for (kvm_memslot_iter_start(iter, slots, start); \
1127	kvm_memslot_iter_is_valid(iter, end); \
1128	kvm_memslot_iter_next(iter))
1129
1130	/*
1131	* KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
1132	* - create a new memory slot
1133	* - delete an existing memory slot
1134	* - modify an existing memory slot
1135	* -- move it in the guest physical memory space
1136	* -- just change its flags
1137	*
1138	* Since flags can be changed by some of these operations, the following
1139	* differentiation is the best we can do for __kvm_set_memory_region():
1140	*/
1141	enum kvm_mr_change {
1142	KVM_MR_CREATE,
1143	KVM_MR_DELETE,
1144	KVM_MR_MOVE,
1145	KVM_MR_FLAGS_ONLY,
1146	};
1147
1148	int kvm_set_memory_region(struct kvm *kvm,
1149	const struct kvm_userspace_memory_region *mem);
1150	int __kvm_set_memory_region(struct kvm *kvm,
1151	const struct kvm_userspace_memory_region *mem);
1152	void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);
1153	void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
1154	int kvm_arch_prepare_memory_region(struct kvm *kvm,
1155	const struct kvm_memory_slot *old,
1156	struct kvm_memory_slot *new,
1157	enum kvm_mr_change change);
1158	void kvm_arch_commit_memory_region(struct kvm *kvm,
1159	struct kvm_memory_slot *old,
1160	const struct kvm_memory_slot *new,
1161	enum kvm_mr_change change);
1162	/* flush all memory translations */
1163	void kvm_arch_flush_shadow_all(struct kvm *kvm);
1164	/* flush memory translations pointing to 'slot' */
1165	void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
1166	struct kvm_memory_slot *slot);
1167
1168	int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1169	struct page **pages, int nr_pages);
1170
1171	struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
1172	unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
1173	unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
1174	unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
1175	unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
1176	bool *writable);
1177	void kvm_release_page_clean(struct page *page);
1178	void kvm_release_page_dirty(struct page *page);
1179
1180	kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
1181	kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1182	bool *writable);
1183	kvm_pfn_t gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn);
1184	kvm_pfn_t gfn_to_pfn_memslot_atomic(const struct kvm_memory_slot *slot, gfn_t gfn);
1185	kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn,
1186	bool atomic, bool interruptible, bool *async,
1187	bool write_fault, bool *writable, hva_t *hva);
1188
1189	void kvm_release_pfn_clean(kvm_pfn_t pfn);
1190	void kvm_release_pfn_dirty(kvm_pfn_t pfn);
1191	void kvm_set_pfn_dirty(kvm_pfn_t pfn);
1192	void kvm_set_pfn_accessed(kvm_pfn_t pfn);
1193
1194	void kvm_release_pfn(kvm_pfn_t pfn, bool dirty);
1195	int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1196	int len);
1197	int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
1198	int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1199	void *data, unsigned long len);
1200	int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1201	void *data, unsigned int offset,
1202	unsigned long len);
1203	int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1204	int offset, int len);
1205	int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1206	unsigned long len);
1207	int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1208	void *data, unsigned long len);
1209	int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1210	void *data, unsigned int offset,
1211	unsigned long len);
1212	int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1213	gpa_t gpa, unsigned long len);
1214
1215	#define __kvm_get_guest(kvm, gfn, offset, v) \
1216	({ \
1217	unsigned long __addr = gfn_to_hva(kvm, gfn); \
1218	typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \
1219	int __ret = -EFAULT; \
1220	\
1221	if (!kvm_is_error_hva(__addr)) \
1222	__ret = get_user(v, __uaddr); \
1223	__ret; \
1224	})
1225
1226	#define kvm_get_guest(kvm, gpa, v) \
1227	({ \
1228	gpa_t __gpa = gpa; \
1229	struct kvm *__kvm = kvm; \
1230	\
1231	__kvm_get_guest(__kvm, __gpa >> PAGE_SHIFT, \
1232	offset_in_page(__gpa), v); \
1233	})
1234
1235	#define __kvm_put_guest(kvm, gfn, offset, v) \
1236	({ \
1237	unsigned long __addr = gfn_to_hva(kvm, gfn); \
1238	typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \
1239	int __ret = -EFAULT; \
1240	\
1241	if (!kvm_is_error_hva(__addr)) \
1242	__ret = put_user(v, __uaddr); \
1243	if (!__ret) \
1244	mark_page_dirty(kvm, gfn); \
1245	__ret; \
1246	})
1247
1248	#define kvm_put_guest(kvm, gpa, v) \
1249	({ \
1250	gpa_t __gpa = gpa; \
1251	struct kvm *__kvm = kvm; \
1252	\
1253	__kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \
1254	offset_in_page(__gpa), v); \
1255	})
1256
1257	int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
1258	struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
1259	bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
1260	bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);
1261	unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn);
1262	void mark_page_dirty_in_slot(struct kvm *kvm, const struct kvm_memory_slot *memslot, gfn_t gfn);
1263	void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
1264
1265	struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
1266	struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
1267	kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
1268	kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
1269	int kvm_vcpu_map(struct kvm_vcpu *vcpu, gpa_t gpa, struct kvm_host_map *map);
1270	void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty);
1271	unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
1272	unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
1273	int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
1274	int len);
1275	int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
1276	unsigned long len);
1277	int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
1278	unsigned long len);
1279	int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
1280	int offset, int len);
1281	int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1282	unsigned long len);
1283	void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
1284
1285	/**
1286	* kvm_gpc_init - initialize gfn_to_pfn_cache.
1287	*
1288	* @gpc: struct gfn_to_pfn_cache object.
1289	* @kvm: pointer to kvm instance.
1290	* @vcpu: vCPU to be used for marking pages dirty and to be woken on
1291	* invalidation.
1292	* @usage: indicates if the resulting host physical PFN is used while
1293	* the @vcpu is IN_GUEST_MODE (in which case invalidation of
1294	* the cache from MMU notifiers---but not for KVM memslot
1295	* changes!---will also force @vcpu to exit the guest and
1296	* refresh the cache); and/or if the PFN used directly
1297	* by KVM (and thus needs a kernel virtual mapping).
1298	*
1299	* This sets up a gfn_to_pfn_cache by initializing locks and assigning the
1300	* immutable attributes. Note, the cache must be zero-allocated (or zeroed by
1301	* the caller before init).
1302	*/
1303	void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm,
1304	struct kvm_vcpu *vcpu, enum pfn_cache_usage usage);
1305
1306	/**
1307	* kvm_gpc_activate - prepare a cached kernel mapping and HPA for a given guest
1308	* physical address.
1309	*
1310	* @gpc: struct gfn_to_pfn_cache object.
1311	* @gpa: guest physical address to map.
1312	* @len: sanity check; the range being access must fit a single page.
1313	*
1314	* @return: 0 for success.
1315	* -EINVAL for a mapping which would cross a page boundary.
1316	* -EFAULT for an untranslatable guest physical address.
1317	*
1318	* This primes a gfn_to_pfn_cache and links it into the @gpc->kvm's list for
1319	* invalidations to be processed. Callers are required to use kvm_gpc_check()
1320	* to ensure that the cache is valid before accessing the target page.
1321	*/
1322	int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
1323
1324	/**
1325	* kvm_gpc_check - check validity of a gfn_to_pfn_cache.
1326	*
1327	* @gpc: struct gfn_to_pfn_cache object.
1328	* @len: sanity check; the range being access must fit a single page.
1329	*
1330	* @return: %true if the cache is still valid and the address matches.
1331	* %false if the cache is not valid.
1332	*
1333	* Callers outside IN_GUEST_MODE context should hold a read lock on @gpc->lock
1334	* while calling this function, and then continue to hold the lock until the
1335	* access is complete.
1336	*
1337	* Callers in IN_GUEST_MODE may do so without locking, although they should
1338	* still hold a read lock on kvm->scru for the memslot checks.
1339	*/
1340	bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len);
1341
1342	/**
1343	* kvm_gpc_refresh - update a previously initialized cache.
1344	*
1345	* @gpc: struct gfn_to_pfn_cache object.
1346	* @len: sanity check; the range being access must fit a single page.
1347	*
1348	* @return: 0 for success.
1349	* -EINVAL for a mapping which would cross a page boundary.
1350	* -EFAULT for an untranslatable guest physical address.
1351	*
1352	* This will attempt to refresh a gfn_to_pfn_cache. Note that a successful
1353	* return from this function does not mean the page can be immediately
1354	* accessed because it may have raced with an invalidation. Callers must
1355	* still lock and check the cache status, as this function does not return
1356	* with the lock still held to permit access.
1357	*/
1358	int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len);
1359
1360	/**
1361	* kvm_gpc_deactivate - deactivate and unlink a gfn_to_pfn_cache.
1362	*
1363	* @gpc: struct gfn_to_pfn_cache object.
1364	*
1365	* This removes a cache from the VM's list to be processed on MMU notifier
1366	* invocation.
1367	*/
1368	void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc);
1369
1370	void kvm_sigset_activate(struct kvm_vcpu *vcpu);
1371	void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
1372
1373	void kvm_vcpu_halt(struct kvm_vcpu *vcpu);
1374	bool kvm_vcpu_block(struct kvm_vcpu *vcpu);
1375	void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
1376	void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
1377	bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
1378	void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
1379	int kvm_vcpu_yield_to(struct kvm_vcpu *target);
1380	void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode);
1381
1382	void kvm_flush_remote_tlbs(struct kvm *kvm);
1383	void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);
1384	void kvm_flush_remote_tlbs_memslot(struct kvm *kvm,
1385	const struct kvm_memory_slot *memslot);
1386
1387	#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
1388	int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min);
1389	int __kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int capacity, int min);
1390	int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc);
1391	void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc);
1392	void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
1393	#endif
1394
1395	void kvm_mmu_invalidate_begin(struct kvm *kvm, unsigned long start,
1396	unsigned long end);
1397	void kvm_mmu_invalidate_end(struct kvm *kvm, unsigned long start,
1398	unsigned long end);
1399
1400	long kvm_arch_dev_ioctl(struct file *filp,
1401	unsigned int ioctl, unsigned long arg);
1402	long kvm_arch_vcpu_ioctl(struct file *filp,
1403	unsigned int ioctl, unsigned long arg);
1404	vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
1405
1406	int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
1407
1408	void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
1409	struct kvm_memory_slot *slot,
1410	gfn_t gfn_offset,
1411	unsigned long mask);
1412	void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot);
1413
1414	#ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1415	int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log);
1416	int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log,
1417	int *is_dirty, struct kvm_memory_slot **memslot);
1418	#endif
1419
1420	int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
1421	bool line_status);
1422	int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
1423	struct kvm_enable_cap *cap);
1424	int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);
1425	long kvm_arch_vm_compat_ioctl(struct file *filp, unsigned int ioctl,
1426	unsigned long arg);
1427
1428	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
1429	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
1430
1431	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1432	struct kvm_translation *tr);
1433
1434	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
1435	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
1436	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1437	struct kvm_sregs *sregs);
1438	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1439	struct kvm_sregs *sregs);
1440	int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
1441	struct kvm_mp_state *mp_state);
1442	int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
1443	struct kvm_mp_state *mp_state);
1444	int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
1445	struct kvm_guest_debug *dbg);
1446	int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu);
1447
1448	void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
1449
1450	void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
1451	void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
1452	int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
1453	int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);
1454	void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
1455	void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
1456
1457	#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
1458	int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state);
1459	#endif
1460
1461	#ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
1462	void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry);
1463	#else
1464	static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
1465	#endif
1466
1467	#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
1468	int kvm_arch_hardware_enable(void);
1469	void kvm_arch_hardware_disable(void);
1470	#endif
1471	int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
1472	bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
1473	int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
1474	bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu);
1475	bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu);
1476	int kvm_arch_post_init_vm(struct kvm *kvm);
1477	void kvm_arch_pre_destroy_vm(struct kvm *kvm);
1478	int kvm_arch_create_vm_debugfs(struct kvm *kvm);
1479
1480	#ifndef __KVM_HAVE_ARCH_VM_ALLOC
1481	/*
1482	* All architectures that want to use vzalloc currently also
1483	* need their own kvm_arch_alloc_vm implementation.
1484	*/
1485	static inline struct kvm *kvm_arch_alloc_vm(void)
1486	{
1487	return kzalloc(sizeof(struct kvm), GFP_KERNEL_ACCOUNT);
1488	}
1489	#endif
1490
1491	static inline void __kvm_arch_free_vm(struct kvm *kvm)
1492	{
1493	kvfree(addr: kvm);
1494	}
1495
1496	#ifndef __KVM_HAVE_ARCH_VM_FREE
1497	static inline void kvm_arch_free_vm(struct kvm *kvm)
1498	{
1499	__kvm_arch_free_vm(kvm);
1500	}
1501	#endif
1502
1503	#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
1504	static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
1505	{
1506	return -ENOTSUPP;
1507	}
1508	#else
1509	int kvm_arch_flush_remote_tlbs(struct kvm *kvm);
1510	#endif
1511
1512	#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
1513	static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm,
1514	gfn_t gfn, u64 nr_pages)
1515	{
1516	return -EOPNOTSUPP;
1517	}
1518	#else
1519	int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages);
1520	#endif
1521
1522	#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
1523	void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
1524	void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
1525	bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
1526	#else
1527	static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
1528	{
1529	}
1530
1531	static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
1532	{
1533	}
1534
1535	static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
1536	{
1537	return false;
1538	}
1539	#endif
1540	#ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
1541	void kvm_arch_start_assignment(struct kvm *kvm);
1542	void kvm_arch_end_assignment(struct kvm *kvm);
1543	bool kvm_arch_has_assigned_device(struct kvm *kvm);
1544	#else
1545	static inline void kvm_arch_start_assignment(struct kvm *kvm)
1546	{
1547	}
1548
1549	static inline void kvm_arch_end_assignment(struct kvm *kvm)
1550	{
1551	}
1552
1553	static __always_inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
1554	{
1555	return false;
1556	}
1557	#endif
1558
1559	static inline struct rcuwait *kvm_arch_vcpu_get_wait(struct kvm_vcpu *vcpu)
1560	{
1561	#ifdef __KVM_HAVE_ARCH_WQP
1562	return vcpu->arch.waitp;
1563	#else
1564	return &vcpu->wait;
1565	#endif
1566	}
1567
1568	/*
1569	* Wake a vCPU if necessary, but don't do any stats/metadata updates. Returns
1570	* true if the vCPU was blocking and was awakened, false otherwise.
1571	*/
1572	static inline bool __kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
1573	{
1574	return !!rcuwait_wake_up(w: kvm_arch_vcpu_get_wait(vcpu));
1575	}
1576
1577	static inline bool kvm_vcpu_is_blocking(struct kvm_vcpu *vcpu)
1578	{
1579	return rcuwait_active(w: kvm_arch_vcpu_get_wait(vcpu));
1580	}
1581
1582	#ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
1583	/*
1584	* returns true if the virtual interrupt controller is initialized and
1585	* ready to accept virtual IRQ. On some architectures the virtual interrupt
1586	* controller is dynamically instantiated and this is not always true.
1587	*/
1588	bool kvm_arch_intc_initialized(struct kvm *kvm);
1589	#else
1590	static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
1591	{
1592	return true;
1593	}
1594	#endif
1595
1596	#ifdef CONFIG_GUEST_PERF_EVENTS
1597	unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu);
1598
1599	void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void));
1600	void kvm_unregister_perf_callbacks(void);
1601	#else
1602	static inline void kvm_register_perf_callbacks(void *ign) {}
1603	static inline void kvm_unregister_perf_callbacks(void) {}
1604	#endif /* CONFIG_GUEST_PERF_EVENTS */
1605
1606	int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
1607	void kvm_arch_destroy_vm(struct kvm *kvm);
1608	void kvm_arch_sync_events(struct kvm *kvm);
1609
1610	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
1611
1612	struct page *kvm_pfn_to_refcounted_page(kvm_pfn_t pfn);
1613	bool kvm_is_zone_device_page(struct page *page);
1614
1615	struct kvm_irq_ack_notifier {
1616	struct hlist_node link;
1617	unsigned gsi;
1618	void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
1619	};
1620
1621	int kvm_irq_map_gsi(struct kvm *kvm,
1622	struct kvm_kernel_irq_routing_entry *entries, int gsi);
1623	int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
1624
1625	int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
1626	bool line_status);
1627	int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
1628	int irq_source_id, int level, bool line_status);
1629	int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
1630	struct kvm *kvm, int irq_source_id,
1631	int level, bool line_status);
1632	bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
1633	void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
1634	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
1635	void kvm_register_irq_ack_notifier(struct kvm *kvm,
1636	struct kvm_irq_ack_notifier *kian);
1637	void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
1638	struct kvm_irq_ack_notifier *kian);
1639	int kvm_request_irq_source_id(struct kvm *kvm);
1640	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
1641	bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
1642
1643	/*
1644	* Returns a pointer to the memslot if it contains gfn.
1645	* Otherwise returns NULL.
1646	*/
1647	static inline struct kvm_memory_slot *
1648	try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1649	{
1650	if (!slot)
1651	return NULL;
1652
1653	if (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages)
1654	return slot;
1655	else
1656	return NULL;
1657	}
1658
1659	/*
1660	* Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
1661	*
1662	* With "approx" set returns the memslot also when the address falls
1663	* in a hole. In that case one of the memslots bordering the hole is
1664	* returned.
1665	*/
1666	static inline struct kvm_memory_slot *
1667	search_memslots(struct kvm_memslots *slots, gfn_t gfn, bool approx)
1668	{
1669	struct kvm_memory_slot *slot;
1670	struct rb_node *node;
1671	int idx = slots->node_idx;
1672
1673	slot = NULL;
1674	for (node = slots->gfn_tree.rb_node; node; ) {
1675	slot = container_of(node, struct kvm_memory_slot, gfn_node[idx]);
1676	if (gfn >= slot->base_gfn) {
1677	if (gfn < slot->base_gfn + slot->npages)
1678	return slot;
1679	node = node->rb_right;
1680	} else
1681	node = node->rb_left;
1682	}
1683
1684	return approx ? slot : NULL;
1685	}
1686
1687	static inline struct kvm_memory_slot *
1688	____gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn, bool approx)
1689	{
1690	struct kvm_memory_slot *slot;
1691
1692	slot = (struct kvm_memory_slot *)atomic_long_read(v: &slots->last_used_slot);
1693	slot = try_get_memslot(slot, gfn);
1694	if (slot)
1695	return slot;
1696
1697	slot = search_memslots(slots, gfn, approx);
1698	if (slot) {
1699	atomic_long_set(v: &slots->last_used_slot, i: (unsigned long)slot);
1700	return slot;
1701	}
1702
1703	return NULL;
1704	}
1705
1706	/*
1707	* __gfn_to_memslot() and its descendants are here to allow arch code to inline
1708	* the lookups in hot paths. gfn_to_memslot() itself isn't here as an inline
1709	* because that would bloat other code too much.
1710	*/
1711	static inline struct kvm_memory_slot *
1712	__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
1713	{
1714	return ____gfn_to_memslot(slots, gfn, approx: false);
1715	}
1716
1717	static inline unsigned long
1718	__gfn_to_hva_memslot(const struct kvm_memory_slot *slot, gfn_t gfn)
1719	{
1720	/*
1721	* The index was checked originally in search_memslots. To avoid
1722	* that a malicious guest builds a Spectre gadget out of e.g. page
1723	* table walks, do not let the processor speculate loads outside
1724	* the guest's registered memslots.
1725	*/
1726	unsigned long offset = gfn - slot->base_gfn;
1727	offset = array_index_nospec(offset, slot->npages);
1728	return slot->userspace_addr + offset * PAGE_SIZE;
1729	}
1730
1731	static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
1732	{
1733	return gfn_to_memslot(kvm, gfn)->id;
1734	}
1735
1736	static inline gfn_t
1737	hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
1738	{
1739	gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
1740
1741	return slot->base_gfn + gfn_offset;
1742	}
1743
1744	static inline gpa_t gfn_to_gpa(gfn_t gfn)
1745	{
1746	return (gpa_t)gfn << PAGE_SHIFT;
1747	}
1748
1749	static inline gfn_t gpa_to_gfn(gpa_t gpa)
1750	{
1751	return (gfn_t)(gpa >> PAGE_SHIFT);
1752	}
1753
1754	static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
1755	{
1756	return (hpa_t)pfn << PAGE_SHIFT;
1757	}
1758
1759	static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
1760	{
1761	unsigned long hva = gfn_to_hva(kvm, gfn: gpa_to_gfn(gpa));
1762
1763	return kvm_is_error_hva(addr: hva);
1764	}
1765
1766	enum kvm_stat_kind {
1767	KVM_STAT_VM,
1768	KVM_STAT_VCPU,
1769	};
1770
1771	struct kvm_stat_data {
1772	struct kvm *kvm;
1773	const struct _kvm_stats_desc *desc;
1774	enum kvm_stat_kind kind;
1775	};
1776
1777	struct _kvm_stats_desc {
1778	struct kvm_stats_desc desc;
1779	char name[KVM_STATS_NAME_SIZE];
1780	};
1781
1782	#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \
1783	.flags = type | unit | base | \
1784	BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \
1785	BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \
1786	BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \
1787	.exponent = exp, \
1788	.size = sz, \
1789	.bucket_size = bsz
1790
1791	#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1792	{ \
1793	{ \
1794	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1795	.offset = offsetof(struct kvm_vm_stat, generic.stat) \
1796	}, \
1797	.name = #stat, \
1798	}
1799	#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1800	{ \
1801	{ \
1802	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1803	.offset = offsetof(struct kvm_vcpu_stat, generic.stat) \
1804	}, \
1805	.name = #stat, \
1806	}
1807	#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1808	{ \
1809	{ \
1810	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1811	.offset = offsetof(struct kvm_vm_stat, stat) \
1812	}, \
1813	.name = #stat, \
1814	}
1815	#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
1816	{ \
1817	{ \
1818	STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
1819	.offset = offsetof(struct kvm_vcpu_stat, stat) \
1820	}, \
1821	.name = #stat, \
1822	}
1823	/* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */
1824	#define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz) \
1825	SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
1826
1827	#define STATS_DESC_CUMULATIVE(SCOPE, name, unit, base, exponent) \
1828	STATS_DESC(SCOPE, name, KVM_STATS_TYPE_CUMULATIVE, \
1829	unit, base, exponent, 1, 0)
1830	#define STATS_DESC_INSTANT(SCOPE, name, unit, base, exponent) \
1831	STATS_DESC(SCOPE, name, KVM_STATS_TYPE_INSTANT, \
1832	unit, base, exponent, 1, 0)
1833	#define STATS_DESC_PEAK(SCOPE, name, unit, base, exponent) \
1834	STATS_DESC(SCOPE, name, KVM_STATS_TYPE_PEAK, \
1835	unit, base, exponent, 1, 0)
1836	#define STATS_DESC_LINEAR_HIST(SCOPE, name, unit, base, exponent, sz, bsz) \
1837	STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LINEAR_HIST, \
1838	unit, base, exponent, sz, bsz)
1839	#define STATS_DESC_LOG_HIST(SCOPE, name, unit, base, exponent, sz) \
1840	STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LOG_HIST, \
1841	unit, base, exponent, sz, 0)
1842
1843	/* Cumulative counter, read/write */
1844	#define STATS_DESC_COUNTER(SCOPE, name) \
1845	STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_NONE, \
1846	KVM_STATS_BASE_POW10, 0)
1847	/* Instantaneous counter, read only */
1848	#define STATS_DESC_ICOUNTER(SCOPE, name) \
1849	STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_NONE, \
1850	KVM_STATS_BASE_POW10, 0)
1851	/* Peak counter, read/write */
1852	#define STATS_DESC_PCOUNTER(SCOPE, name) \
1853	STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_NONE, \
1854	KVM_STATS_BASE_POW10, 0)
1855
1856	/* Instantaneous boolean value, read only */
1857	#define STATS_DESC_IBOOLEAN(SCOPE, name) \
1858	STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \
1859	KVM_STATS_BASE_POW10, 0)
1860	/* Peak (sticky) boolean value, read/write */
1861	#define STATS_DESC_PBOOLEAN(SCOPE, name) \
1862	STATS_DESC_PEAK(SCOPE, name, KVM_STATS_UNIT_BOOLEAN, \
1863	KVM_STATS_BASE_POW10, 0)
1864
1865	/* Cumulative time in nanosecond */
1866	#define STATS_DESC_TIME_NSEC(SCOPE, name) \
1867	STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1868	KVM_STATS_BASE_POW10, -9)
1869	/* Linear histogram for time in nanosecond */
1870	#define STATS_DESC_LINHIST_TIME_NSEC(SCOPE, name, sz, bsz) \
1871	STATS_DESC_LINEAR_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1872	KVM_STATS_BASE_POW10, -9, sz, bsz)
1873	/* Logarithmic histogram for time in nanosecond */
1874	#define STATS_DESC_LOGHIST_TIME_NSEC(SCOPE, name, sz) \
1875	STATS_DESC_LOG_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
1876	KVM_STATS_BASE_POW10, -9, sz)
1877
1878	#define KVM_GENERIC_VM_STATS() \
1879	STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \
1880	STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests)
1881
1882	#define KVM_GENERIC_VCPU_STATS() \
1883	STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
1884	STATS_DESC_COUNTER(VCPU_GENERIC, halt_attempted_poll), \
1885	STATS_DESC_COUNTER(VCPU_GENERIC, halt_poll_invalid), \
1886	STATS_DESC_COUNTER(VCPU_GENERIC, halt_wakeup), \
1887	STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_success_ns), \
1888	STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns), \
1889	STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_wait_ns), \
1890	STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_success_hist, \
1891	HALT_POLL_HIST_COUNT), \
1892	STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_hist, \
1893	HALT_POLL_HIST_COUNT), \
1894	STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_wait_hist, \
1895	HALT_POLL_HIST_COUNT), \
1896	STATS_DESC_IBOOLEAN(VCPU_GENERIC, blocking)
1897
1898	extern struct dentry *kvm_debugfs_dir;
1899
1900	ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
1901	const struct _kvm_stats_desc *desc,
1902	void *stats, size_t size_stats,
1903	char __user *user_buffer, size_t size, loff_t *offset);
1904
1905	/**
1906	* kvm_stats_linear_hist_update() - Update bucket value for linear histogram
1907	* statistics data.
1908	*
1909	* @data: start address of the stats data
1910	* @size: the number of bucket of the stats data
1911	* @value: the new value used to update the linear histogram's bucket
1912	* @bucket_size: the size (width) of a bucket
1913	*/
1914	static inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
1915	u64 value, size_t bucket_size)
1916	{
1917	size_t index = div64_u64(dividend: value, divisor: bucket_size);
1918
1919	index = min(index, size - 1);
1920	++data[index];
1921	}
1922
1923	/**
1924	* kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram
1925	* statistics data.
1926	*
1927	* @data: start address of the stats data
1928	* @size: the number of bucket of the stats data
1929	* @value: the new value used to update the logarithmic histogram's bucket
1930	*/
1931	static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
1932	{
1933	size_t index = fls64(x: value);
1934
1935	index = min(index, size - 1);
1936	++data[index];
1937	}
1938
1939	#define KVM_STATS_LINEAR_HIST_UPDATE(array, value, bsize) \
1940	kvm_stats_linear_hist_update(array, ARRAY_SIZE(array), value, bsize)
1941	#define KVM_STATS_LOG_HIST_UPDATE(array, value) \
1942	kvm_stats_log_hist_update(array, ARRAY_SIZE(array), value)
1943
1944
1945	extern const struct kvm_stats_header kvm_vm_stats_header;
1946	extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
1947	extern const struct kvm_stats_header kvm_vcpu_stats_header;
1948	extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
1949
1950	#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1951	static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
1952	{
1953	if (unlikely(kvm->mmu_invalidate_in_progress))
1954	return 1;
1955	/*
1956	* Ensure the read of mmu_invalidate_in_progress happens before
1957	* the read of mmu_invalidate_seq. This interacts with the
1958	* smp_wmb() in mmu_notifier_invalidate_range_end to make sure
1959	* that the caller either sees the old (non-zero) value of
1960	* mmu_invalidate_in_progress or the new (incremented) value of
1961	* mmu_invalidate_seq.
1962	*
1963	* PowerPC Book3s HV KVM calls this under a per-page lock rather
1964	* than under kvm->mmu_lock, for scalability, so can't rely on
1965	* kvm->mmu_lock to keep things ordered.
1966	*/
1967	smp_rmb();
1968	if (kvm->mmu_invalidate_seq != mmu_seq)
1969	return 1;
1970	return 0;
1971	}
1972
1973	static inline int mmu_invalidate_retry_hva(struct kvm *kvm,
1974	unsigned long mmu_seq,
1975	unsigned long hva)
1976	{
1977	lockdep_assert_held(&kvm->mmu_lock);
1978	/*
1979	* If mmu_invalidate_in_progress is non-zero, then the range maintained
1980	* by kvm_mmu_notifier_invalidate_range_start contains all addresses
1981	* that might be being invalidated. Note that it may include some false
1982	* positives, due to shortcuts when handing concurrent invalidations.
1983	*/
1984	if (unlikely(kvm->mmu_invalidate_in_progress) &&
1985	hva >= kvm->mmu_invalidate_range_start &&
1986	hva < kvm->mmu_invalidate_range_end)
1987	return 1;
1988	if (kvm->mmu_invalidate_seq != mmu_seq)
1989	return 1;
1990	return 0;
1991	}
1992	#endif
1993
1994	#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
1995
1996	#define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
1997
1998	bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
1999	int kvm_set_irq_routing(struct kvm *kvm,
2000	const struct kvm_irq_routing_entry *entries,
2001	unsigned nr,
2002	unsigned flags);
2003	int kvm_set_routing_entry(struct kvm *kvm,
2004	struct kvm_kernel_irq_routing_entry *e,
2005	const struct kvm_irq_routing_entry *ue);
2006	void kvm_free_irq_routing(struct kvm *kvm);
2007
2008	#else
2009
2010	static inline void kvm_free_irq_routing(struct kvm *kvm) {}
2011
2012	#endif
2013
2014	int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
2015
2016	#ifdef CONFIG_HAVE_KVM_EVENTFD
2017
2018	void kvm_eventfd_init(struct kvm *kvm);
2019	int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
2020
2021	#ifdef CONFIG_HAVE_KVM_IRQFD
2022	int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
2023	void kvm_irqfd_release(struct kvm *kvm);
2024	bool kvm_notify_irqfd_resampler(struct kvm *kvm,
2025	unsigned int irqchip,
2026	unsigned int pin);
2027	void kvm_irq_routing_update(struct kvm *);
2028	#else
2029	static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
2030	{
2031	return -EINVAL;
2032	}
2033
2034	static inline void kvm_irqfd_release(struct kvm *kvm) {}
2035
2036	static inline bool kvm_notify_irqfd_resampler(struct kvm *kvm,
2037	unsigned int irqchip,
2038	unsigned int pin)
2039	{
2040	return false;
2041	}
2042	#endif
2043
2044	#else
2045
2046	static inline void kvm_eventfd_init(struct kvm *kvm) {}
2047
2048	static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
2049	{
2050	return -EINVAL;
2051	}
2052
2053	static inline void kvm_irqfd_release(struct kvm *kvm) {}
2054
2055	#ifdef CONFIG_HAVE_KVM_IRQCHIP
2056	static inline void kvm_irq_routing_update(struct kvm *kvm)
2057	{
2058	}
2059	#endif
2060
2061	static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
2062	{
2063	return -ENOSYS;
2064	}
2065
2066	#endif /* CONFIG_HAVE_KVM_EVENTFD */
2067
2068	void kvm_arch_irq_routing_update(struct kvm *kvm);
2069
2070	static inline void __kvm_make_request(int req, struct kvm_vcpu *vcpu)
2071	{
2072	/*
2073	* Ensure the rest of the request is published to kvm_check_request's
2074	* caller. Paired with the smp_mb__after_atomic in kvm_check_request.
2075	*/
2076	smp_wmb();
2077	set_bit(nr: req & KVM_REQUEST_MASK, addr: (void *)&vcpu->requests);
2078	}
2079
2080	static __always_inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
2081	{
2082	/*
2083	* Request that don't require vCPU action should never be logged in
2084	* vcpu->requests. The vCPU won't clear the request, so it will stay
2085	* logged indefinitely and prevent the vCPU from entering the guest.
2086	*/
2087	BUILD_BUG_ON(!__builtin_constant_p(req) ||
2088	(req & KVM_REQUEST_NO_ACTION));
2089
2090	__kvm_make_request(req, vcpu);
2091	}
2092
2093	static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
2094	{
2095	return READ_ONCE(vcpu->requests);
2096	}
2097
2098	static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
2099	{
2100	return test_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
2101	}
2102
2103	static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
2104	{
2105	clear_bit(nr: req & KVM_REQUEST_MASK, addr: (void *)&vcpu->requests);
2106	}
2107
2108	static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
2109	{
2110	if (kvm_test_request(req, vcpu)) {
2111	kvm_clear_request(req, vcpu);
2112
2113	/*
2114	* Ensure the rest of the request is visible to kvm_check_request's
2115	* caller. Paired with the smp_wmb in kvm_make_request.
2116	*/
2117	smp_mb__after_atomic();
2118	return true;
2119	} else {
2120	return false;
2121	}
2122	}
2123
2124	#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
2125	extern bool kvm_rebooting;
2126	#endif
2127
2128	extern unsigned int halt_poll_ns;
2129	extern unsigned int halt_poll_ns_grow;
2130	extern unsigned int halt_poll_ns_grow_start;
2131	extern unsigned int halt_poll_ns_shrink;
2132
2133	struct kvm_device {
2134	const struct kvm_device_ops *ops;
2135	struct kvm *kvm;
2136	void *private;
2137	struct list_head vm_node;
2138	};
2139
2140	/* create, destroy, and name are mandatory */
2141	struct kvm_device_ops {
2142	const char *name;
2143
2144	/*
2145	* create is called holding kvm->lock and any operations not suitable
2146	* to do while holding the lock should be deferred to init (see
2147	* below).
2148	*/
2149	int (*create)(struct kvm_device *dev, u32 type);
2150
2151	/*
2152	* init is called after create if create is successful and is called
2153	* outside of holding kvm->lock.
2154	*/
2155	void (*init)(struct kvm_device *dev);
2156
2157	/*
2158	* Destroy is responsible for freeing dev.
2159	*
2160	* Destroy may be called before or after destructors are called
2161	* on emulated I/O regions, depending on whether a reference is
2162	* held by a vcpu or other kvm component that gets destroyed
2163	* after the emulated I/O.
2164	*/
2165	void (*destroy)(struct kvm_device *dev);
2166
2167	/*
2168	* Release is an alternative method to free the device. It is
2169	* called when the device file descriptor is closed. Once
2170	* release is called, the destroy method will not be called
2171	* anymore as the device is removed from the device list of
2172	* the VM. kvm->lock is held.
2173	*/
2174	void (*release)(struct kvm_device *dev);
2175
2176	int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2177	int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2178	int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
2179	long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
2180	unsigned long arg);
2181	int (*mmap)(struct kvm_device *dev, struct vm_area_struct *vma);
2182	};
2183
2184	struct kvm_device *kvm_device_from_filp(struct file *filp);
2185	int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type);
2186	void kvm_unregister_device_ops(u32 type);
2187
2188	extern struct kvm_device_ops kvm_mpic_ops;
2189	extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
2190	extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
2191
2192	#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2193
2194	static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
2195	{
2196	vcpu->spin_loop.in_spin_loop = val;
2197	}
2198	static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
2199	{
2200	vcpu->spin_loop.dy_eligible = val;
2201	}
2202
2203	#else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
2204
2205	static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
2206	{
2207	}
2208
2209	static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
2210	{
2211	}
2212	#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
2213
2214	static inline bool kvm_is_visible_memslot(struct kvm_memory_slot *memslot)
2215	{
2216	return (memslot && memslot->id < KVM_USER_MEM_SLOTS &&
2217	!(memslot->flags & KVM_MEMSLOT_INVALID));
2218	}
2219
2220	struct kvm_vcpu *kvm_get_running_vcpu(void);
2221	struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
2222
2223	#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
2224	bool kvm_arch_has_irq_bypass(void);
2225	int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
2226	struct irq_bypass_producer *);
2227	void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
2228	struct irq_bypass_producer *);
2229	void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
2230	void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
2231	int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
2232	uint32_t guest_irq, bool set);
2233	bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *,
2234	struct kvm_kernel_irq_routing_entry *);
2235	#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
2236
2237	#ifdef CONFIG_HAVE_KVM_INVALID_WAKEUPS
2238	/* If we wakeup during the poll time, was it a sucessful poll? */
2239	static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
2240	{
2241	return vcpu->valid_wakeup;
2242	}
2243
2244	#else
2245	static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
2246	{
2247	return true;
2248	}
2249	#endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
2250
2251	#ifdef CONFIG_HAVE_KVM_NO_POLL
2252	/* Callback that tells if we must not poll */
2253	bool kvm_arch_no_poll(struct kvm_vcpu *vcpu);
2254	#else
2255	static inline bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
2256	{
2257	return false;
2258	}
2259	#endif /* CONFIG_HAVE_KVM_NO_POLL */
2260
2261	#ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
2262	long kvm_arch_vcpu_async_ioctl(struct file *filp,
2263	unsigned int ioctl, unsigned long arg);
2264	#else
2265	static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
2266	unsigned int ioctl,
2267	unsigned long arg)
2268	{
2269	return -ENOIOCTLCMD;
2270	}
2271	#endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
2272
2273	void kvm_arch_guest_memory_reclaimed(struct kvm *kvm);
2274
2275	#ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE
2276	int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);
2277	#else
2278	static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
2279	{
2280	return 0;
2281	}
2282	#endif /* CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE */
2283
2284	typedef int (*kvm_vm_thread_fn_t)(struct kvm *kvm, uintptr_t data);
2285
2286	int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn,
2287	uintptr_t data, const char *name,
2288	struct task_struct **thread_ptr);
2289
2290	#ifdef CONFIG_KVM_XFER_TO_GUEST_WORK
2291	static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
2292	{
2293	vcpu->run->exit_reason = KVM_EXIT_INTR;
2294	vcpu->stat.signal_exits++;
2295	}
2296	#endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
2297
2298	/*
2299	* If more than one page is being (un)accounted, @virt must be the address of
2300	* the first page of a block of pages what were allocated together (i.e
2301	* accounted together).
2302	*
2303	* kvm_account_pgtable_pages() is thread-safe because mod_lruvec_page_state()
2304	* is thread-safe.
2305	*/
2306	static inline void kvm_account_pgtable_pages(void *virt, int nr)
2307	{
2308	mod_lruvec_page_state(virt_to_page(virt), idx: NR_SECONDARY_PAGETABLE, val: nr);
2309	}
2310
2311	/*
2312	* This defines how many reserved entries we want to keep before we
2313	* kick the vcpu to the userspace to avoid dirty ring full. This
2314	* value can be tuned to higher if e.g. PML is enabled on the host.
2315	*/
2316	#define KVM_DIRTY_RING_RSVD_ENTRIES 64
2317
2318	/* Max number of entries allowed for each kvm dirty ring */
2319	#define KVM_DIRTY_RING_MAX_ENTRIES 65536
2320
2321	#endif
2322