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	1	/*
	2	* Copyright (c) 2000-2016 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <kern/kalloc.h>
	30	#include <vm/vm_compressor_pager.h>
	31	#include <vm/vm_kern.h>
	32	#include <vm/vm_page.h>
	33	#include <vm/vm_protos.h>
	34	#include <vm/WKdm_new.h>
	35	#include <vm/vm_object.h>
	36	#include <vm/vm_map.h>
	37	#include <machine/pmap.h>
	38	#include <kern/locks.h>
	39
	40	#include <sys/kdebug.h>
	41
	42	#if defined(__arm64__)
	43	#include <arm/proc_reg.h>
	44	#endif
	45
	46	#define C_SEG_OFFSET_BITS 16
	47	#define C_SEG_BUFSIZE (1024 * 256)
	48	#define C_SEG_MAX_PAGES (C_SEG_BUFSIZE / PAGE_SIZE)
	49
	50	#if CONFIG_EMBEDDED
	51	#define C_SEG_OFF_LIMIT (C_SEG_BYTES_TO_OFFSET((C_SEG_BUFSIZE - 512)))
	52	#define C_SEG_ALLOCSIZE (C_SEG_BUFSIZE + PAGE_SIZE)
	53	#else
	54	#define C_SEG_OFF_LIMIT (C_SEG_BYTES_TO_OFFSET((C_SEG_BUFSIZE - 128)))
	55	#define C_SEG_ALLOCSIZE (C_SEG_BUFSIZE)
	56	#endif
	57	#define C_SEG_MAX_POPULATE_SIZE (4 * PAGE_SIZE)
	58
	59	#if defined(__arm64__)
	60
	61	#if DEVELOPMENT \|\| DEBUG
	62
	63	#if defined(PLATFORM_WatchOS)
	64	#define VALIDATE_C_SEGMENTS (1)
	65	#endif
	66	#endif
	67
	68	#endif
	69
	70
	71	#if DEBUG \|\| COMPRESSOR_INTEGRITY_CHECKS
	72	#define ENABLE_SWAP_CHECKS 1
	73	#define ENABLE_COMPRESSOR_CHECKS 1
	74	#define POPCOUNT_THE_COMPRESSED_DATA (1)
	75	#else
	76	#define ENABLE_SWAP_CHECKS 0
	77	#define ENABLE_COMPRESSOR_CHECKS 0
	78	#endif
	79
	80	#define CHECKSUM_THE_SWAP ENABLE_SWAP_CHECKS /* Debug swap data */
	81	#define CHECKSUM_THE_DATA ENABLE_COMPRESSOR_CHECKS /* Debug compressor/decompressor data */
	82	#define CHECKSUM_THE_COMPRESSED_DATA ENABLE_COMPRESSOR_CHECKS /* Debug compressor/decompressor compressed data */
	83
	84	#ifndef VALIDATE_C_SEGMENTS
	85	#define VALIDATE_C_SEGMENTS ENABLE_COMPRESSOR_CHECKS /* Debug compaction */
	86	#endif
	87
	88	#define RECORD_THE_COMPRESSED_DATA 0
	89
	90	struct c_slot {
	91	uint64_t c_offset:C_SEG_OFFSET_BITS,
	92	#if defined(__arm64__)
	93	c_size:14,
	94	c_codec:1,
	95	c_packed_ptr:33;
	96	#elif defined(__arm__)
	97	c_size:12,
	98	c_codec:1,
	99	c_packed_ptr:35;
	100	#else
	101	c_size:12,
	102	c_packed_ptr:36;
	103	#endif
	104	#if CHECKSUM_THE_DATA
	105	unsigned int c_hash_data;
	106	#endif
	107	#if CHECKSUM_THE_COMPRESSED_DATA
	108	unsigned int c_hash_compressed_data;
	109	#endif
	110	#if POPCOUNT_THE_COMPRESSED_DATA
	111	unsigned int c_pop_cdata;
	112	#endif
	113	};
	114
	115	#define C_IS_EMPTY 0
	116	#define C_IS_FREE 1
	117	#define C_IS_FILLING 2
	118	#define C_ON_AGE_Q 3
	119	#define C_ON_SWAPOUT_Q 4
	120	#define C_ON_SWAPPEDOUT_Q 5
	121	#define C_ON_SWAPPEDOUTSPARSE_Q 6
	122	#define C_ON_SWAPPEDIN_Q 7
	123	#define C_ON_MAJORCOMPACT_Q 8
	124	#define C_ON_BAD_Q 9
	125	#define C_ON_SWAPIO_Q 10
	126
	127
	128	struct c_segment {
	129	lck_mtx_t c_lock;
	130	queue_chain_t c_age_list;
	131	queue_chain_t c_list;
	132
	133	#define C_SEG_MAX_LIMIT (1 << 20) /* this needs to track the size of c_mysegno */
	134	uint32_t c_mysegno:20,
	135	c_busy:1,
	136	c_busy_swapping:1,
	137	c_wanted:1,
	138	c_on_minorcompact_q:1, /* can also be on the age_q, the majorcompact_q or the swappedin_q */
	139
	140	c_state:4, /* what state is the segment in which dictates which q to find it on */
	141	c_overage_swap:1,
	142	c_reserved:3;
	143
	144	uint32_t c_creation_ts;
	145	uint64_t c_generation_id;
	146
	147	int32_t c_bytes_used;
	148	int32_t c_bytes_unused;
	149	uint32_t c_slots_used;
	150
	151	uint16_t c_firstemptyslot;
	152	uint16_t c_nextslot;
	153	uint32_t c_nextoffset;
	154	uint32_t c_populated_offset;
	155
	156	uint32_t c_swappedin_ts;
	157
	158	union {
	159	int32_t *c_buffer;
	160	uint64_t c_swap_handle;
	161	} c_store;
	162
	163	#if VALIDATE_C_SEGMENTS
	164	uint32_t c_was_minor_compacted;
	165	uint32_t c_was_major_compacted;
	166	uint32_t c_was_major_donor;
	167	#endif
	168	#if CHECKSUM_THE_SWAP
	169	unsigned int cseg_hash;
	170	unsigned int cseg_swap_size;
	171	#endif /* CHECKSUM_THE_SWAP */
	172
	173	#if MACH_ASSERT
	174	thread_t c_busy_for_thread;
	175	#endif /* MACH_ASSERT */
	176
	177	int c_slot_var_array_len;
	178	struct c_slot *c_slot_var_array;
	179	struct c_slot c_slot_fixed_array[0];
	180	};
	181
	182
	183	struct c_slot_mapping {
	184	uint32_t s_cseg:22, /* segment number + 1 */
	185	s_cindx:10; /* index in the segment */
	186	};
	187	#define C_SLOT_MAX_INDEX (1 << 10)
	188
	189	typedef struct c_slot_mapping *c_slot_mapping_t;
	190
	191
	192	#define C_SEG_SLOT_VAR_ARRAY_MIN_LEN C_SEG_MAX_PAGES
	193
	194	extern int c_seg_fixed_array_len;
	195	extern vm_offset_t c_buffers;
	196	#define C_SEG_BUFFER_ADDRESS(c_segno) ((c_buffers + ((uint64_t)c_segno * (uint64_t)C_SEG_ALLOCSIZE)))
	197
	198	#define C_SEG_SLOT_FROM_INDEX(cseg, index) (index < c_seg_fixed_array_len ? &(cseg->c_slot_fixed_array[index]) : &(cseg->c_slot_var_array[index - c_seg_fixed_array_len]))
	199
	200	#define C_SEG_OFFSET_TO_BYTES(off) ((off) * (int) sizeof(int32_t))
	201	#define C_SEG_BYTES_TO_OFFSET(bytes) ((bytes) / (int) sizeof(int32_t))
	202
	203	#define C_SEG_UNUSED_BYTES(cseg) (cseg->c_bytes_unused + (C_SEG_OFFSET_TO_BYTES(cseg->c_populated_offset - cseg->c_nextoffset)))
	204	//todo opensource
	205
	206	#ifndef __PLATFORM_WKDM_ALIGNMENT_MASK__
	207	#define C_SEG_OFFSET_ALIGNMENT_MASK 0x3ULL
	208	#define C_SEG_OFFSET_ALIGNMENT_BOUNDARY 0x4
	209	#else
	210	#define C_SEG_OFFSET_ALIGNMENT_MASK __PLATFORM_WKDM_ALIGNMENT_MASK__
	211	#define C_SEG_OFFSET_ALIGNMENT_BOUNDARY __PLATFORM_WKDM_ALIGNMENT_BOUNDARY__
	212	#endif
	213
	214	#define C_SEG_SHOULD_MINORCOMPACT_NOW(cseg) ((C_SEG_UNUSED_BYTES(cseg) >= (C_SEG_BUFSIZE / 4)) ? 1 : 0)
	215
	216	/*
	217	* the decsion to force a c_seg to be major compacted is based on 2 criteria
	218	* 1) is the c_seg buffer almost empty (i.e. we have a chance to merge it with another c_seg)
	219	* 2) are there at least a minimum number of slots unoccupied so that we have a chance
	220	* of combining this c_seg with another one.
	221	*/
	222	#define C_SEG_SHOULD_MAJORCOMPACT_NOW(cseg) \
	223	((((cseg->c_bytes_unused + (C_SEG_BUFSIZE - C_SEG_OFFSET_TO_BYTES(c_seg->c_nextoffset))) >= (C_SEG_BUFSIZE / 8)) && \
	224	((C_SLOT_MAX_INDEX - cseg->c_slots_used) > (C_SEG_BUFSIZE / PAGE_SIZE))) \
	225	? 1 : 0)
	226
	227	#define C_SEG_ONDISK_IS_SPARSE(cseg) ((cseg->c_bytes_used < cseg->c_bytes_unused) ? 1 : 0)
	228	#define C_SEG_IS_ONDISK(cseg) ((cseg->c_state == C_ON_SWAPPEDOUT_Q \|\| cseg->c_state == C_ON_SWAPPEDOUTSPARSE_Q))
	229	#define C_SEG_IS_ON_DISK_OR_SOQ(cseg) ((cseg->c_state == C_ON_SWAPPEDOUT_Q \|\| \
	230	cseg->c_state == C_ON_SWAPPEDOUTSPARSE_Q \|\| \
	231	cseg->c_state == C_ON_SWAPOUT_Q \|\| \
	232	cseg->c_state == C_ON_SWAPIO_Q))
	233
	234
	235	#define C_SEG_WAKEUP_DONE(cseg) \
	236	MACRO_BEGIN \
	237	assert((cseg)->c_busy); \
	238	(cseg)->c_busy = 0; \
	239	assert((cseg)->c_busy_for_thread != NULL); \
	240	assert((((cseg)->c_busy_for_thread = NULL), TRUE)); \
	241	if ((cseg)->c_wanted) { \
	242	(cseg)->c_wanted = 0; \
	243	thread_wakeup((event_t) (cseg)); \
	244	} \
	245	MACRO_END
	246
	247	#define C_SEG_BUSY(cseg) \
	248	MACRO_BEGIN \
	249	assert((cseg)->c_busy == 0); \
	250	(cseg)->c_busy = 1; \
	251	assert((cseg)->c_busy_for_thread == NULL); \
	252	assert((((cseg)->c_busy_for_thread = current_thread()), TRUE)); \
	253	MACRO_END
	254
	255
	256	extern vm_map_t compressor_map;
	257
	258	#if DEVELOPMENT \|\| DEBUG
	259	extern boolean_t write_protect_c_segs;
	260	extern int vm_compressor_test_seg_wp;
	261
	262	#define C_SEG_MAKE_WRITEABLE(cseg) \
	263	MACRO_BEGIN \
	264	if (write_protect_c_segs) { \
	265	vm_map_protect(compressor_map, \
	266	(vm_map_offset_t)cseg->c_store.c_buffer, \
	267	(vm_map_offset_t)&cseg->c_store.c_buffer[C_SEG_BYTES_TO_OFFSET(C_SEG_ALLOCSIZE)],\
	268	VM_PROT_READ \| VM_PROT_WRITE, \
	269	0); \
	270	} \
	271	MACRO_END
	272
	273	#define C_SEG_WRITE_PROTECT(cseg) \
	274	MACRO_BEGIN \
	275	if (write_protect_c_segs) { \
	276	vm_map_protect(compressor_map, \
	277	(vm_map_offset_t)cseg->c_store.c_buffer, \
	278	(vm_map_offset_t)&cseg->c_store.c_buffer[C_SEG_BYTES_TO_OFFSET(C_SEG_ALLOCSIZE)],\
	279	VM_PROT_READ, \
	280	0); \
	281	} \
	282	if (vm_compressor_test_seg_wp) { \
	283	volatile uint32_t vmtstmp = (volatile uint32_t )cseg->c_store.c_buffer; \
	284	(volatile uint32_t )cseg->c_store.c_buffer = 0xDEADABCD; \
	285	(void) vmtstmp; \
	286	} \
	287	MACRO_END
	288	#endif
	289
	290	typedef struct c_segment *c_segment_t;
	291	typedef struct c_slot *c_slot_t;
	292
	293	uint64_t vm_compressor_total_compressions(void);
	294	void vm_wake_compactor_swapper(void);
	295	void vm_run_compactor(void);
	296	void vm_thrashing_jetsam_done(void);
	297	void vm_consider_waking_compactor_swapper(void);
	298	void vm_consider_swapping(void);
	299	void vm_compressor_flush(void);
	300	void c_seg_free(c_segment_t);
	301	void c_seg_free_locked(c_segment_t);
	302	void c_seg_insert_into_age_q(c_segment_t);
	303	void c_seg_need_delayed_compaction(c_segment_t, boolean_t);
	304
	305	void vm_decompressor_lock(void);
	306	void vm_decompressor_unlock(void);
	307
	308	void vm_compressor_delay_trim(void);
	309	void vm_compressor_do_warmup(void);
	310	void vm_compressor_record_warmup_start(void);
	311	void vm_compressor_record_warmup_end(void);
	312
	313	int vm_wants_task_throttled(task_t);
	314
	315	extern void vm_compaction_swapper_do_init(void);
	316	extern void vm_compressor_swap_init(void);
	317	extern void vm_compressor_init_locks(void);
	318	extern lck_rw_t c_master_lock;
	319
	320	#if ENCRYPTED_SWAP
	321	extern void vm_swap_decrypt(c_segment_t);
	322	#endif /* ENCRYPTED_SWAP */
	323
	324	extern int vm_swap_low_on_space(void);
	325	extern kern_return_t vm_swap_get(c_segment_t, uint64_t, uint64_t);
	326	extern void vm_swap_free(uint64_t);
	327	extern void vm_swap_consider_defragmenting(int);
	328
	329	extern void c_seg_swapin_requeue(c_segment_t, boolean_t, boolean_t, boolean_t);
	330	extern int c_seg_swapin(c_segment_t, boolean_t, boolean_t);
	331	extern void c_seg_wait_on_busy(c_segment_t);
	332	extern void c_seg_trim_tail(c_segment_t);
	333	extern void c_seg_switch_state(c_segment_t, int, boolean_t);
	334
	335	extern boolean_t fastwake_recording_in_progress;
	336	extern int compaction_swapper_inited;
	337	extern int compaction_swapper_running;
	338	extern uint64_t vm_swap_put_failures;
	339
	340	extern int c_overage_swapped_count;
	341	extern int c_overage_swapped_limit;
	342
	343	extern queue_head_t c_minor_list_head;
	344	extern queue_head_t c_age_list_head;
	345	extern queue_head_t c_swapout_list_head;
	346	extern queue_head_t c_swappedout_list_head;
	347	extern queue_head_t c_swappedout_sparse_list_head;
	348
	349	extern uint32_t c_age_count;
	350	extern uint32_t c_swapout_count;
	351	extern uint32_t c_swappedout_count;
	352	extern uint32_t c_swappedout_sparse_count;
	353
	354	extern int64_t compressor_bytes_used;
	355	extern uint64_t first_c_segment_to_warm_generation_id;
	356	extern uint64_t last_c_segment_to_warm_generation_id;
	357	extern boolean_t hibernate_flushing;
	358	extern boolean_t hibernate_no_swapspace;
	359	extern boolean_t hibernate_in_progress_with_pinned_swap;
	360	extern uint32_t swapout_target_age;
	361
	362	extern void c_seg_insert_into_q(queue_head_t *, c_segment_t);
	363
	364	extern uint32_t vm_compressor_minorcompact_threshold_divisor;
	365	extern uint32_t vm_compressor_majorcompact_threshold_divisor;
	366	extern uint32_t vm_compressor_unthrottle_threshold_divisor;
	367	extern uint32_t vm_compressor_catchup_threshold_divisor;
	368
	369	extern uint32_t vm_compressor_minorcompact_threshold_divisor_overridden;
	370	extern uint32_t vm_compressor_majorcompact_threshold_divisor_overridden;
	371	extern uint32_t vm_compressor_unthrottle_threshold_divisor_overridden;
	372	extern uint32_t vm_compressor_catchup_threshold_divisor_overridden;
	373
	374	extern uint64_t vm_compressor_compute_elapsed_msecs(clock_sec_t, clock_nsec_t, clock_sec_t, clock_nsec_t);
	375
	376	#define PAGE_REPLACEMENT_DISALLOWED(enable) (enable == TRUE ? lck_rw_lock_shared(&c_master_lock) : lck_rw_done(&c_master_lock))
	377	#define PAGE_REPLACEMENT_ALLOWED(enable) (enable == TRUE ? lck_rw_lock_exclusive(&c_master_lock) : lck_rw_done(&c_master_lock))
	378
	379
	380	#define AVAILABLE_NON_COMPRESSED_MEMORY (vm_page_active_count + vm_page_inactive_count + vm_page_free_count + vm_page_speculative_count)
	381	#define AVAILABLE_MEMORY (AVAILABLE_NON_COMPRESSED_MEMORY + VM_PAGE_COMPRESSOR_COUNT)
	382
	383	/*
	384	* TODO, there may be a minor optimisation opportunity to replace these divisions
	385	* with multiplies and shifts
	386	*
	387	* By multiplying by 10, the divisors can have more precision w/o resorting to floating point... a divisor specified as 25 is in reality a divide by 2.5
	388	* By multiplying by 9, you get a number ~11% smaller which allows us to have another limit point derived from the same base
	389	* By multiplying by 11, you get a number ~10% bigger which allows us to generate a reset limit derived from the same base which is useful for hysteresis
	390	*/
	391
	392	#define VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_minorcompact_threshold_divisor ? vm_compressor_minorcompact_threshold_divisor : 10))
	393	#define VM_PAGE_COMPRESSOR_SWAP_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_majorcompact_threshold_divisor ? vm_compressor_majorcompact_threshold_divisor : 10))
	394
	395	#define VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_unthrottle_threshold_divisor ? vm_compressor_unthrottle_threshold_divisor : 10))
	396	#define VM_PAGE_COMPRESSOR_SWAP_RETHROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 11) / (vm_compressor_unthrottle_threshold_divisor ? vm_compressor_unthrottle_threshold_divisor : 11))
	397
	398	#define VM_PAGE_COMPRESSOR_SWAP_HAS_CAUGHTUP_THRESHOLD (((AVAILABLE_MEMORY) * 11) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 11))
	399	#define VM_PAGE_COMPRESSOR_SWAP_CATCHUP_THRESHOLD (((AVAILABLE_MEMORY) * 10) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 10))
	400	#define VM_PAGE_COMPRESSOR_HARD_THROTTLE_THRESHOLD (((AVAILABLE_MEMORY) * 9) / (vm_compressor_catchup_threshold_divisor ? vm_compressor_catchup_threshold_divisor : 9))
	401
	402	#ifdef CONFIG_EMBEDDED
	403	#define AVAILABLE_NON_COMPRESSED_MIN 20000
	404	#define COMPRESSOR_NEEDS_TO_SWAP() (((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_THRESHOLD) \|\| \
	405	(AVAILABLE_NON_COMPRESSED_MEMORY < AVAILABLE_NON_COMPRESSED_MIN)) ? 1 : 0)
	406	#else
	407	#define COMPRESSOR_NEEDS_TO_SWAP() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_THRESHOLD) ? 1 : 0)
	408	#endif
	409
	410	#define HARD_THROTTLE_LIMIT_REACHED() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_HARD_THROTTLE_THRESHOLD) ? 1 : 0)
	411	#define SWAPPER_NEEDS_TO_UNTHROTTLE() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD) ? 1 : 0)
	412	#define SWAPPER_NEEDS_TO_RETHROTTLE() ((AVAILABLE_NON_COMPRESSED_MEMORY > VM_PAGE_COMPRESSOR_SWAP_RETHROTTLE_THRESHOLD) ? 1 : 0)
	413	#define SWAPPER_NEEDS_TO_CATCHUP() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_SWAP_CATCHUP_THRESHOLD) ? 1 : 0)
	414	#define SWAPPER_HAS_CAUGHTUP() ((AVAILABLE_NON_COMPRESSED_MEMORY > VM_PAGE_COMPRESSOR_SWAP_HAS_CAUGHTUP_THRESHOLD) ? 1 : 0)
	415	#define COMPRESSOR_NEEDS_TO_MINOR_COMPACT() ((AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD) ? 1 : 0)
	416
	417
	418	#ifdef CONFIG_EMBEDDED
	419	#define COMPRESSOR_FREE_RESERVED_LIMIT 28
	420	#else
	421	#define COMPRESSOR_FREE_RESERVED_LIMIT 128
	422	#endif
	423
	424	uint32_t vm_compressor_get_encode_scratch_size(void);
	425	uint32_t vm_compressor_get_decode_scratch_size(void);
	426
	427	#define COMPRESSOR_SCRATCH_BUF_SIZE vm_compressor_get_encode_scratch_size()
	428
	429	#if RECORD_THE_COMPRESSED_DATA
	430	extern void c_compressed_record_init(void);
	431	extern void c_compressed_record_write(char *, int);
	432	#endif
	433
	434	extern lck_mtx_t *c_list_lock;
	435
	436	#if DEVELOPMENT \|\| DEBUG
	437	extern uint32_t vm_ktrace_enabled;
	438
	439	#define VMKDBG(x, ...) \
	440	MACRO_BEGIN \
	441	if (vm_ktrace_enabled) { \
	442	KDBG(x, ## __VA_ARGS__);\
	443	} \
	444	MACRO_END
	445	#endif