1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24 /*
25 * Copyright (c) 2010, Intel Corporation.
26 * All rights reserved.
27 */
28 /*
29 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
30 * Copyright (c) 2014, 2015 by Delphix. All rights reserved.
31 */
32
33 /*
34 * VM - Hardware Address Translation management for i386 and amd64
35 *
36 * Implementation of the interfaces described in <common/vm/hat.h>
37 *
38 * Nearly all the details of how the hardware is managed should not be
39 * visible outside this layer except for misc. machine specific functions
40 * that work in conjunction with this code.
41 *
42 * Routines used only inside of i86pc/vm start with hati_ for HAT Internal.
43 */
44
45 #include <sys/machparam.h>
46 #include <sys/machsystm.h>
47 #include <sys/mman.h>
48 #include <sys/types.h>
49 #include <sys/systm.h>
50 #include <sys/cpuvar.h>
51 #include <sys/thread.h>
52 #include <sys/proc.h>
53 #include <sys/cpu.h>
54 #include <sys/kmem.h>
55 #include <sys/disp.h>
56 #include <sys/shm.h>
57 #include <sys/sysmacros.h>
58 #include <sys/machparam.h>
59 #include <sys/vmem.h>
60 #include <sys/vmsystm.h>
61 #include <sys/promif.h>
62 #include <sys/var.h>
63 #include <sys/x86_archext.h>
64 #include <sys/atomic.h>
65 #include <sys/bitmap.h>
66 #include <sys/controlregs.h>
67 #include <sys/bootconf.h>
68 #include <sys/bootsvcs.h>
69 #include <sys/bootinfo.h>
70 #include <sys/archsystm.h>
71
72 #include <vm/seg_kmem.h>
73 #include <vm/hat_i86.h>
74 #include <vm/as.h>
75 #include <vm/seg.h>
76 #include <vm/page.h>
77 #include <vm/seg_kp.h>
78 #include <vm/seg_kpm.h>
79 #include <vm/vm_dep.h>
80 #ifdef __xpv
81 #include <sys/hypervisor.h>
82 #endif
83 #include <vm/kboot_mmu.h>
84 #include <vm/seg_spt.h>
85
86 #include <sys/cmn_err.h>
87
88 /*
89 * Basic parameters for hat operation.
90 */
91 struct hat_mmu_info mmu;
92
93 /*
94 * The page that is the kernel's top level pagetable.
95 *
96 * For 32 bit PAE support on i86pc, the kernel hat will use the 1st 4 entries
97 * on this 4K page for its top level page table. The remaining groups of
98 * 4 entries are used for per processor copies of user VLP pagetables for
99 * running threads. See hat_switch() and reload_pae32() for details.
100 *
101 * vlp_page[0..3] - level==2 PTEs for kernel HAT
102 * vlp_page[4..7] - level==2 PTEs for user thread on cpu 0
103 * vlp_page[8..11] - level==2 PTE for user thread on cpu 1
104 * etc...
105 */
106 static x86pte_t *vlp_page;
107
108 /*
109 * forward declaration of internal utility routines
110 */
111 static x86pte_t hati_update_pte(htable_t *ht, uint_t entry, x86pte_t expected,
112 x86pte_t new);
113
114 /*
115 * The kernel address space exists in all HATs. To implement this the
116 * kernel reserves a fixed number of entries in the topmost level(s) of page
117 * tables. The values are setup during startup and then copied to every user
118 * hat created by hat_alloc(). This means that kernelbase must be:
119 *
120 * 4Meg aligned for 32 bit kernels
121 * 512Gig aligned for x86_64 64 bit kernel
122 *
123 * The hat_kernel_range_ts describe what needs to be copied from kernel hat
124 * to each user hat.
125 */
126 typedef struct hat_kernel_range {
127 level_t hkr_level;
128 uintptr_t hkr_start_va;
129 uintptr_t hkr_end_va; /* zero means to end of memory */
130 } hat_kernel_range_t;
131 #define NUM_KERNEL_RANGE 2
132 static hat_kernel_range_t kernel_ranges[NUM_KERNEL_RANGE];
133 static int num_kernel_ranges;
134
135 uint_t use_boot_reserve = 1; /* cleared after early boot process */
136 uint_t can_steal_post_boot = 0; /* set late in boot to enable stealing */
137
138 /*
139 * enable_1gpg: controls 1g page support for user applications.
140 * By default, 1g pages are exported to user applications. enable_1gpg can
141 * be set to 0 to not export.
142 */
143 int enable_1gpg = 1;
144
145 /*
146 * AMD shanghai processors provide better management of 1gb ptes in its tlb.
147 * By default, 1g page support will be disabled for pre-shanghai AMD
148 * processors that don't have optimal tlb support for the 1g page size.
149 * chk_optimal_1gtlb can be set to 0 to force 1g page support on sub-optimal
150 * processors.
151 */
152 int chk_optimal_1gtlb = 1;
153
154
155 #ifdef DEBUG
156 uint_t map1gcnt;
157 #endif
158
159
160 /*
161 * A cpuset for all cpus. This is used for kernel address cross calls, since
162 * the kernel addresses apply to all cpus.
163 */
164 cpuset_t khat_cpuset;
165
166 /*
167 * management stuff for hat structures
168 */
169 kmutex_t hat_list_lock;
170 kcondvar_t hat_list_cv;
171 kmem_cache_t *hat_cache;
172 kmem_cache_t *hat_hash_cache;
173 kmem_cache_t *vlp_hash_cache;
174
175 /*
176 * Simple statistics
177 */
178 struct hatstats hatstat;
179
180 /*
181 * Some earlier hypervisor versions do not emulate cmpxchg of PTEs
182 * correctly. For such hypervisors we must set PT_USER for kernel
183 * entries ourselves (normally the emulation would set PT_USER for
184 * kernel entries and PT_USER|PT_GLOBAL for user entries). pt_kern is
185 * thus set appropriately. Note that dboot/kbm is OK, as only the full
186 * HAT uses cmpxchg() and the other paths (hypercall etc.) were never
187 * incorrect.
188 */
189 int pt_kern;
190
191 /*
192 * useful stuff for atomic access/clearing/setting REF/MOD/RO bits in page_t's.
193 */
194 extern void atomic_orb(uchar_t *addr, uchar_t val);
195 extern void atomic_andb(uchar_t *addr, uchar_t val);
196
197 #ifndef __xpv
198 extern pfn_t memseg_get_start(struct memseg *);
199 #endif
200
201 #define PP_GETRM(pp, rmmask) (pp->p_nrm & rmmask)
202 #define PP_ISMOD(pp) PP_GETRM(pp, P_MOD)
203 #define PP_ISREF(pp) PP_GETRM(pp, P_REF)
204 #define PP_ISRO(pp) PP_GETRM(pp, P_RO)
205
206 #define PP_SETRM(pp, rm) atomic_orb(&(pp->p_nrm), rm)
207 #define PP_SETMOD(pp) PP_SETRM(pp, P_MOD)
208 #define PP_SETREF(pp) PP_SETRM(pp, P_REF)
209 #define PP_SETRO(pp) PP_SETRM(pp, P_RO)
210
211 #define PP_CLRRM(pp, rm) atomic_andb(&(pp->p_nrm), ~(rm))
212 #define PP_CLRMOD(pp) PP_CLRRM(pp, P_MOD)
213 #define PP_CLRREF(pp) PP_CLRRM(pp, P_REF)
214 #define PP_CLRRO(pp) PP_CLRRM(pp, P_RO)
215 #define PP_CLRALL(pp) PP_CLRRM(pp, P_MOD | P_REF | P_RO)
216
217 /*
218 * kmem cache constructor for struct hat
219 */
220 /*ARGSUSED*/
221 static int
222 hati_constructor(void *buf, void *handle, int kmflags)
223 {
224 hat_t *hat = buf;
225
226 mutex_init(&hat->hat_mutex, NULL, MUTEX_DEFAULT, NULL);
227 bzero(hat->hat_pages_mapped,
228 sizeof (pgcnt_t) * (mmu.max_page_level + 1));
229 hat->hat_ism_pgcnt = 0;
230 hat->hat_stats = 0;
231 hat->hat_flags = 0;
232 CPUSET_ZERO(hat->hat_cpus);
233 hat->hat_htable = NULL;
234 hat->hat_ht_hash = NULL;
235 return (0);
236 }
237
238 /*
239 * Allocate a hat structure for as. We also create the top level
240 * htable and initialize it to contain the kernel hat entries.
241 */
242 hat_t *
243 hat_alloc(struct as *as)
244 {
245 hat_t *hat;
246 htable_t *ht; /* top level htable */
247 uint_t use_vlp;
248 uint_t r;
249 hat_kernel_range_t *rp;
250 uintptr_t va;
251 uintptr_t eva;
252 uint_t start;
253 uint_t cnt;
254 htable_t *src;
255
256 /*
257 * Once we start creating user process HATs we can enable
258 * the htable_steal() code.
259 */
260 if (can_steal_post_boot == 0)
261 can_steal_post_boot = 1;
262
263 ASSERT(AS_WRITE_HELD(as, &as->a_lock));
264 hat = kmem_cache_alloc(hat_cache, KM_SLEEP);
265 hat->hat_as = as;
266 mutex_init(&hat->hat_mutex, NULL, MUTEX_DEFAULT, NULL);
267 ASSERT(hat->hat_flags == 0);
268
269 #if defined(__xpv)
270 /*
271 * No VLP stuff on the hypervisor due to the 64-bit split top level
272 * page tables. On 32-bit it's not needed as the hypervisor takes
273 * care of copying the top level PTEs to a below 4Gig page.
274 */
275 use_vlp = 0;
276 #else /* __xpv */
277 /* 32 bit processes uses a VLP style hat when running with PAE */
278 #if defined(__amd64)
279 use_vlp = (ttoproc(curthread)->p_model == DATAMODEL_ILP32);
280 #elif defined(__i386)
281 use_vlp = mmu.pae_hat;
282 #endif
283 #endif /* __xpv */
284 if (use_vlp) {
285 hat->hat_flags = HAT_VLP;
286 bzero(hat->hat_vlp_ptes, VLP_SIZE);
287 }
288
289 /*
290 * Allocate the htable hash
291 */
292 if ((hat->hat_flags & HAT_VLP)) {
293 hat->hat_num_hash = mmu.vlp_hash_cnt;
294 hat->hat_ht_hash = kmem_cache_alloc(vlp_hash_cache, KM_SLEEP);
295 } else {
296 hat->hat_num_hash = mmu.hash_cnt;
297 hat->hat_ht_hash = kmem_cache_alloc(hat_hash_cache, KM_SLEEP);
298 }
299 bzero(hat->hat_ht_hash, hat->hat_num_hash * sizeof (htable_t *));
300
301 /*
302 * Initialize Kernel HAT entries at the top of the top level page
303 * tables for the new hat.
304 */
305 hat->hat_htable = NULL;
306 hat->hat_ht_cached = NULL;
307 XPV_DISALLOW_MIGRATE();
308 ht = htable_create(hat, (uintptr_t)0, TOP_LEVEL(hat), NULL);
309 hat->hat_htable = ht;
310
311 #if defined(__amd64)
312 if (hat->hat_flags & HAT_VLP)
313 goto init_done;
314 #endif
315
316 for (r = 0; r < num_kernel_ranges; ++r) {
317 rp = &kernel_ranges[r];
318 for (va = rp->hkr_start_va; va != rp->hkr_end_va;
319 va += cnt * LEVEL_SIZE(rp->hkr_level)) {
320
321 if (rp->hkr_level == TOP_LEVEL(hat))
322 ht = hat->hat_htable;
323 else
324 ht = htable_create(hat, va, rp->hkr_level,
325 NULL);
326
327 start = htable_va2entry(va, ht);
328 cnt = HTABLE_NUM_PTES(ht) - start;
329 eva = va +
330 ((uintptr_t)cnt << LEVEL_SHIFT(rp->hkr_level));
331 if (rp->hkr_end_va != 0 &&
332 (eva > rp->hkr_end_va || eva == 0))
333 cnt = htable_va2entry(rp->hkr_end_va, ht) -
334 start;
335
336 #if defined(__i386) && !defined(__xpv)
337 if (ht->ht_flags & HTABLE_VLP) {
338 bcopy(&vlp_page[start],
339 &hat->hat_vlp_ptes[start],
340 cnt * sizeof (x86pte_t));
341 continue;
342 }
343 #endif
344 src = htable_lookup(kas.a_hat, va, rp->hkr_level);
345 ASSERT(src != NULL);
346 x86pte_copy(src, ht, start, cnt);
347 htable_release(src);
348 }
349 }
350
351 init_done:
352
353 #if defined(__xpv)
354 /*
355 * Pin top level page tables after initializing them
356 */
357 xen_pin(hat->hat_htable->ht_pfn, mmu.max_level);
358 #if defined(__amd64)
359 xen_pin(hat->hat_user_ptable, mmu.max_level);
360 #endif
361 #endif
362 XPV_ALLOW_MIGRATE();
363
364 /*
365 * Put it at the start of the global list of all hats (used by stealing)
366 *
367 * kas.a_hat is not in the list but is instead used to find the
368 * first and last items in the list.
369 *
370 * - kas.a_hat->hat_next points to the start of the user hats.
371 * The list ends where hat->hat_next == NULL
372 *
373 * - kas.a_hat->hat_prev points to the last of the user hats.
374 * The list begins where hat->hat_prev == NULL
375 */
376 mutex_enter(&hat_list_lock);
377 hat->hat_prev = NULL;
378 hat->hat_next = kas.a_hat->hat_next;
379 if (hat->hat_next)
380 hat->hat_next->hat_prev = hat;
381 else
382 kas.a_hat->hat_prev = hat;
383 kas.a_hat->hat_next = hat;
384 mutex_exit(&hat_list_lock);
385
386 return (hat);
387 }
388
389 /*
390 * process has finished executing but as has not been cleaned up yet.
391 */
392 /*ARGSUSED*/
393 void
394 hat_free_start(hat_t *hat)
395 {
396 ASSERT(AS_WRITE_HELD(hat->hat_as, &hat->hat_as->a_lock));
397
398 /*
399 * If the hat is currently a stealing victim, wait for the stealing
400 * to finish. Once we mark it as HAT_FREEING, htable_steal()
401 * won't look at its pagetables anymore.
402 */
403 mutex_enter(&hat_list_lock);
404 while (hat->hat_flags & HAT_VICTIM)
405 cv_wait(&hat_list_cv, &hat_list_lock);
406 hat->hat_flags |= HAT_FREEING;
407 mutex_exit(&hat_list_lock);
408 }
409
410 /*
411 * An address space is being destroyed, so we destroy the associated hat.
412 */
413 void
414 hat_free_end(hat_t *hat)
415 {
416 kmem_cache_t *cache;
417
418 ASSERT(hat->hat_flags & HAT_FREEING);
419
420 /*
421 * must not be running on the given hat
422 */
423 ASSERT(CPU->cpu_current_hat != hat);
424
425 /*
426 * Remove it from the list of HATs
427 */
428 mutex_enter(&hat_list_lock);
429 if (hat->hat_prev)
430 hat->hat_prev->hat_next = hat->hat_next;
431 else
432 kas.a_hat->hat_next = hat->hat_next;
433 if (hat->hat_next)
434 hat->hat_next->hat_prev = hat->hat_prev;
435 else
436 kas.a_hat->hat_prev = hat->hat_prev;
437 mutex_exit(&hat_list_lock);
438 hat->hat_next = hat->hat_prev = NULL;
439
440 #if defined(__xpv)
441 /*
442 * On the hypervisor, unpin top level page table(s)
443 */
444 xen_unpin(hat->hat_htable->ht_pfn);
445 #if defined(__amd64)
446 xen_unpin(hat->hat_user_ptable);
447 #endif
448 #endif
449
450 /*
451 * Make a pass through the htables freeing them all up.
452 */
453 htable_purge_hat(hat);
454
455 /*
456 * Decide which kmem cache the hash table came from, then free it.
457 */
458 if (hat->hat_flags & HAT_VLP)
459 cache = vlp_hash_cache;
460 else
461 cache = hat_hash_cache;
462 kmem_cache_free(cache, hat->hat_ht_hash);
463 hat->hat_ht_hash = NULL;
464
465 hat->hat_flags = 0;
466 kmem_cache_free(hat_cache, hat);
467 }
468
469 /*
470 * round kernelbase down to a supported value to use for _userlimit
471 *
472 * userlimit must be aligned down to an entry in the top level htable.
473 * The one exception is for 32 bit HAT's running PAE.
474 */
475 uintptr_t
476 hat_kernelbase(uintptr_t va)
477 {
478 #if defined(__i386)
479 va &= LEVEL_MASK(1);
480 #endif
481 if (IN_VA_HOLE(va))
482 panic("_userlimit %p will fall in VA hole\n", (void *)va);
483 return (va);
484 }
485
486 /*
487 *
488 */
489 static void
490 set_max_page_level()
491 {
492 level_t lvl;
493
494 if (!kbm_largepage_support) {
495 lvl = 0;
496 } else {
497 if (is_x86_feature(x86_featureset, X86FSET_1GPG)) {
498 lvl = 2;
499 if (chk_optimal_1gtlb &&
500 cpuid_opteron_erratum(CPU, 6671130)) {
501 lvl = 1;
502 }
503 if (plat_mnode_xcheck(LEVEL_SIZE(2) >>
504 LEVEL_SHIFT(0))) {
505 lvl = 1;
506 }
507 } else {
508 lvl = 1;
509 }
510 }
511 mmu.max_page_level = lvl;
512
513 if ((lvl == 2) && (enable_1gpg == 0))
514 mmu.umax_page_level = 1;
515 else
516 mmu.umax_page_level = lvl;
517 }
518
519 /*
520 * Initialize hat data structures based on processor MMU information.
521 */
522 void
523 mmu_init(void)
524 {
525 uint_t max_htables;
526 uint_t pa_bits;
527 uint_t va_bits;
528 int i;
529
530 /*
531 * If CPU enabled the page table global bit, use it for the kernel
532 * This is bit 7 in CR4 (PGE - Page Global Enable).
533 */
534 if (is_x86_feature(x86_featureset, X86FSET_PGE) &&
535 (getcr4() & CR4_PGE) != 0)
536 mmu.pt_global = PT_GLOBAL;
537
538 /*
539 * Detect NX and PAE usage.
540 */
541 mmu.pae_hat = kbm_pae_support;
542 if (kbm_nx_support)
543 mmu.pt_nx = PT_NX;
544 else
545 mmu.pt_nx = 0;
546
547 /*
548 * Use CPU info to set various MMU parameters
549 */
550 cpuid_get_addrsize(CPU, &pa_bits, &va_bits);
551
552 if (va_bits < sizeof (void *) * NBBY) {
553 mmu.hole_start = (1ul << (va_bits - 1));
554 mmu.hole_end = 0ul - mmu.hole_start - 1;
555 } else {
556 mmu.hole_end = 0;
557 mmu.hole_start = mmu.hole_end - 1;
558 }
559 #if defined(OPTERON_ERRATUM_121)
560 /*
561 * If erratum 121 has already been detected at this time, hole_start
562 * contains the value to be subtracted from mmu.hole_start.
563 */
564 ASSERT(hole_start == 0 || opteron_erratum_121 != 0);
565 hole_start = mmu.hole_start - hole_start;
566 #else
567 hole_start = mmu.hole_start;
568 #endif
569 hole_end = mmu.hole_end;
570
571 mmu.highest_pfn = mmu_btop((1ull << pa_bits) - 1);
572 if (mmu.pae_hat == 0 && pa_bits > 32)
573 mmu.highest_pfn = PFN_4G - 1;
574
575 if (mmu.pae_hat) {
576 mmu.pte_size = 8; /* 8 byte PTEs */
577 mmu.pte_size_shift = 3;
578 } else {
579 mmu.pte_size = 4; /* 4 byte PTEs */
580 mmu.pte_size_shift = 2;
581 }
582
583 if (mmu.pae_hat && !is_x86_feature(x86_featureset, X86FSET_PAE))
584 panic("Processor does not support PAE");
585
586 if (!is_x86_feature(x86_featureset, X86FSET_CX8))
587 panic("Processor does not support cmpxchg8b instruction");
588
589 #if defined(__amd64)
590
591 mmu.num_level = 4;
592 mmu.max_level = 3;
593 mmu.ptes_per_table = 512;
594 mmu.top_level_count = 512;
595
596 mmu.level_shift[0] = 12;
597 mmu.level_shift[1] = 21;
598 mmu.level_shift[2] = 30;
599 mmu.level_shift[3] = 39;
600
601 #elif defined(__i386)
602
603 if (mmu.pae_hat) {
604 mmu.num_level = 3;
605 mmu.max_level = 2;
606 mmu.ptes_per_table = 512;
607 mmu.top_level_count = 4;
608
609 mmu.level_shift[0] = 12;
610 mmu.level_shift[1] = 21;
611 mmu.level_shift[2] = 30;
612
613 } else {
614 mmu.num_level = 2;
615 mmu.max_level = 1;
616 mmu.ptes_per_table = 1024;
617 mmu.top_level_count = 1024;
618
619 mmu.level_shift[0] = 12;
620 mmu.level_shift[1] = 22;
621 }
622
623 #endif /* __i386 */
624
625 for (i = 0; i < mmu.num_level; ++i) {
626 mmu.level_size[i] = 1UL << mmu.level_shift[i];
627 mmu.level_offset[i] = mmu.level_size[i] - 1;
628 mmu.level_mask[i] = ~mmu.level_offset[i];
629 }
630
631 set_max_page_level();
632
633 mmu_page_sizes = mmu.max_page_level + 1;
634 mmu_exported_page_sizes = mmu.umax_page_level + 1;
635
636 /* restrict legacy applications from using pagesizes 1g and above */
637 mmu_legacy_page_sizes =
638 (mmu_exported_page_sizes > 2) ? 2 : mmu_exported_page_sizes;
639
640
641 for (i = 0; i <= mmu.max_page_level; ++i) {
642 mmu.pte_bits[i] = PT_VALID | pt_kern;
643 if (i > 0)
644 mmu.pte_bits[i] |= PT_PAGESIZE;
645 }
646
647 /*
648 * NOTE Legacy 32 bit PAE mode only has the P_VALID bit at top level.
649 */
650 for (i = 1; i < mmu.num_level; ++i)
651 mmu.ptp_bits[i] = PT_PTPBITS;
652
653 #if defined(__i386)
654 mmu.ptp_bits[2] = PT_VALID;
655 #endif
656
657 /*
658 * Compute how many hash table entries to have per process for htables.
659 * We start with 1 page's worth of entries.
660 *
661 * If physical memory is small, reduce the amount need to cover it.
662 */
663 max_htables = physmax / mmu.ptes_per_table;
664 mmu.hash_cnt = MMU_PAGESIZE / sizeof (htable_t *);
665 while (mmu.hash_cnt > 16 && mmu.hash_cnt >= max_htables)
666 mmu.hash_cnt >>= 1;
667 mmu.vlp_hash_cnt = mmu.hash_cnt;
668
669 #if defined(__amd64)
670 /*
671 * If running in 64 bits and physical memory is large,
672 * increase the size of the cache to cover all of memory for
673 * a 64 bit process.
674 */
675 #define HASH_MAX_LENGTH 4
676 while (mmu.hash_cnt * HASH_MAX_LENGTH < max_htables)
677 mmu.hash_cnt <<= 1;
678 #endif
679 }
680
681
682 /*
683 * initialize hat data structures
684 */
685 void
686 hat_init()
687 {
688 #if defined(__i386)
689 /*
690 * _userlimit must be aligned correctly
691 */
692 if ((_userlimit & LEVEL_MASK(1)) != _userlimit) {
693 prom_printf("hat_init(): _userlimit=%p, not aligned at %p\n",
694 (void *)_userlimit, (void *)LEVEL_SIZE(1));
695 halt("hat_init(): Unable to continue");
696 }
697 #endif
698
699 cv_init(&hat_list_cv, NULL, CV_DEFAULT, NULL);
700
701 /*
702 * initialize kmem caches
703 */
704 htable_init();
705 hment_init();
706
707 hat_cache = kmem_cache_create("hat_t",
708 sizeof (hat_t), 0, hati_constructor, NULL, NULL,
709 NULL, 0, 0);
710
711 hat_hash_cache = kmem_cache_create("HatHash",
712 mmu.hash_cnt * sizeof (htable_t *), 0, NULL, NULL, NULL,
713 NULL, 0, 0);
714
715 /*
716 * VLP hats can use a smaller hash table size on large memroy machines
717 */
718 if (mmu.hash_cnt == mmu.vlp_hash_cnt) {
719 vlp_hash_cache = hat_hash_cache;
720 } else {
721 vlp_hash_cache = kmem_cache_create("HatVlpHash",
722 mmu.vlp_hash_cnt * sizeof (htable_t *), 0, NULL, NULL, NULL,
723 NULL, 0, 0);
724 }
725
726 /*
727 * Set up the kernel's hat
728 */
729 AS_LOCK_ENTER(&kas, &kas.a_lock, RW_WRITER);
730 kas.a_hat = kmem_cache_alloc(hat_cache, KM_NOSLEEP);
731 mutex_init(&kas.a_hat->hat_mutex, NULL, MUTEX_DEFAULT, NULL);
732 kas.a_hat->hat_as = &kas;
733 kas.a_hat->hat_flags = 0;
734 AS_LOCK_EXIT(&kas, &kas.a_lock);
735
736 CPUSET_ZERO(khat_cpuset);
737 CPUSET_ADD(khat_cpuset, CPU->cpu_id);
738
739 /*
740 * The kernel hat's next pointer serves as the head of the hat list .
741 * The kernel hat's prev pointer tracks the last hat on the list for
742 * htable_steal() to use.
743 */
744 kas.a_hat->hat_next = NULL;
745 kas.a_hat->hat_prev = NULL;
746
747 /*
748 * Allocate an htable hash bucket for the kernel
749 * XX64 - tune for 64 bit procs
750 */
751 kas.a_hat->hat_num_hash = mmu.hash_cnt;
752 kas.a_hat->hat_ht_hash = kmem_cache_alloc(hat_hash_cache, KM_NOSLEEP);
753 bzero(kas.a_hat->hat_ht_hash, mmu.hash_cnt * sizeof (htable_t *));
754
755 /*
756 * zero out the top level and cached htable pointers
757 */
758 kas.a_hat->hat_ht_cached = NULL;
759 kas.a_hat->hat_htable = NULL;
760
761 /*
762 * Pre-allocate hrm_hashtab before enabling the collection of
763 * refmod statistics. Allocating on the fly would mean us
764 * running the risk of suffering recursive mutex enters or
765 * deadlocks.
766 */
767 hrm_hashtab = kmem_zalloc(HRM_HASHSIZE * sizeof (struct hrmstat *),
768 KM_SLEEP);
769 }
770
771 /*
772 * Prepare CPU specific pagetables for VLP processes on 64 bit kernels.
773 *
774 * Each CPU has a set of 2 pagetables that are reused for any 32 bit
775 * process it runs. They are the top level pagetable, hci_vlp_l3ptes, and
776 * the next to top level table for the bottom 512 Gig, hci_vlp_l2ptes.
777 */
778 /*ARGSUSED*/
779 static void
780 hat_vlp_setup(struct cpu *cpu)
781 {
782 #if defined(__amd64) && !defined(__xpv)
783 struct hat_cpu_info *hci = cpu->cpu_hat_info;
784 pfn_t pfn;
785
786 /*
787 * allocate the level==2 page table for the bottom most
788 * 512Gig of address space (this is where 32 bit apps live)
789 */
790 ASSERT(hci != NULL);
791 hci->hci_vlp_l2ptes = kmem_zalloc(MMU_PAGESIZE, KM_SLEEP);
792
793 /*
794 * Allocate a top level pagetable and copy the kernel's
795 * entries into it. Then link in hci_vlp_l2ptes in the 1st entry.
796 */
797 hci->hci_vlp_l3ptes = kmem_zalloc(MMU_PAGESIZE, KM_SLEEP);
798 hci->hci_vlp_pfn =
799 hat_getpfnum(kas.a_hat, (caddr_t)hci->hci_vlp_l3ptes);
800 ASSERT(hci->hci_vlp_pfn != PFN_INVALID);
801 bcopy(vlp_page, hci->hci_vlp_l3ptes, MMU_PAGESIZE);
802
803 pfn = hat_getpfnum(kas.a_hat, (caddr_t)hci->hci_vlp_l2ptes);
804 ASSERT(pfn != PFN_INVALID);
805 hci->hci_vlp_l3ptes[0] = MAKEPTP(pfn, 2);
806 #endif /* __amd64 && !__xpv */
807 }
808
809 /*ARGSUSED*/
810 static void
811 hat_vlp_teardown(cpu_t *cpu)
812 {
813 #if defined(__amd64) && !defined(__xpv)
814 struct hat_cpu_info *hci;
815
816 if ((hci = cpu->cpu_hat_info) == NULL)
817 return;
818 if (hci->hci_vlp_l2ptes)
819 kmem_free(hci->hci_vlp_l2ptes, MMU_PAGESIZE);
820 if (hci->hci_vlp_l3ptes)
821 kmem_free(hci->hci_vlp_l3ptes, MMU_PAGESIZE);
822 #endif
823 }
824
825 #define NEXT_HKR(r, l, s, e) { \
826 kernel_ranges[r].hkr_level = l; \
827 kernel_ranges[r].hkr_start_va = s; \
828 kernel_ranges[r].hkr_end_va = e; \
829 ++r; \
830 }
831
832 /*
833 * Finish filling in the kernel hat.
834 * Pre fill in all top level kernel page table entries for the kernel's
835 * part of the address range. From this point on we can't use any new
836 * kernel large pages if they need PTE's at max_level
837 *
838 * create the kmap mappings.
839 */
840 void
841 hat_init_finish(void)
842 {
843 size_t size;
844 uint_t r = 0;
845 uintptr_t va;
846 hat_kernel_range_t *rp;
847
848
849 /*
850 * We are now effectively running on the kernel hat.
851 * Clearing use_boot_reserve shuts off using the pre-allocated boot
852 * reserve for all HAT allocations. From here on, the reserves are
853 * only used when avoiding recursion in kmem_alloc().
854 */
855 use_boot_reserve = 0;
856 htable_adjust_reserve();
857
858 /*
859 * User HATs are initialized with copies of all kernel mappings in
860 * higher level page tables. Ensure that those entries exist.
861 */
862 #if defined(__amd64)
863
864 NEXT_HKR(r, 3, kernelbase, 0);
865 #if defined(__xpv)
866 NEXT_HKR(r, 3, HYPERVISOR_VIRT_START, HYPERVISOR_VIRT_END);
867 #endif
868
869 #elif defined(__i386)
870
871 #if !defined(__xpv)
872 if (mmu.pae_hat) {
873 va = kernelbase;
874 if ((va & LEVEL_MASK(2)) != va) {
875 va = P2ROUNDUP(va, LEVEL_SIZE(2));
876 NEXT_HKR(r, 1, kernelbase, va);
877 }
878 if (va != 0)
879 NEXT_HKR(r, 2, va, 0);
880 } else
881 #endif /* __xpv */
882 NEXT_HKR(r, 1, kernelbase, 0);
883
884 #endif /* __i386 */
885
886 num_kernel_ranges = r;
887
888 /*
889 * Create all the kernel pagetables that will have entries
890 * shared to user HATs.
891 */
892 for (r = 0; r < num_kernel_ranges; ++r) {
893 rp = &kernel_ranges[r];
894 for (va = rp->hkr_start_va; va != rp->hkr_end_va;
895 va += LEVEL_SIZE(rp->hkr_level)) {
896 htable_t *ht;
897
898 if (IN_HYPERVISOR_VA(va))
899 continue;
900
901 /* can/must skip if a page mapping already exists */
902 if (rp->hkr_level <= mmu.max_page_level &&
903 (ht = htable_getpage(kas.a_hat, va, NULL)) !=
904 NULL) {
905 htable_release(ht);
906 continue;
907 }
908
909 (void) htable_create(kas.a_hat, va, rp->hkr_level - 1,
910 NULL);
911 }
912 }
913
914 /*
915 * 32 bit PAE metal kernels use only 4 of the 512 entries in the
916 * page holding the top level pagetable. We use the remainder for
917 * the "per CPU" page tables for VLP processes.
918 * Map the top level kernel pagetable into the kernel to make
919 * it easy to use bcopy access these tables.
920 */
921 if (mmu.pae_hat) {
922 vlp_page = vmem_alloc(heap_arena, MMU_PAGESIZE, VM_SLEEP);
923 hat_devload(kas.a_hat, (caddr_t)vlp_page, MMU_PAGESIZE,
924 kas.a_hat->hat_htable->ht_pfn,
925 #if !defined(__xpv)
926 PROT_WRITE |
927 #endif
928 PROT_READ | HAT_NOSYNC | HAT_UNORDERED_OK,
929 HAT_LOAD | HAT_LOAD_NOCONSIST);
930 }
931 hat_vlp_setup(CPU);
932
933 /*
934 * Create kmap (cached mappings of kernel PTEs)
935 * for 32 bit we map from segmap_start .. ekernelheap
936 * for 64 bit we map from segmap_start .. segmap_start + segmapsize;
937 */
938 #if defined(__i386)
939 size = (uintptr_t)ekernelheap - segmap_start;
940 #elif defined(__amd64)
941 size = segmapsize;
942 #endif
943 hat_kmap_init((uintptr_t)segmap_start, size);
944 }
945
946 /*
947 * On 32 bit PAE mode, PTE's are 64 bits, but ordinary atomic memory references
948 * are 32 bit, so for safety we must use atomic_cas_64() to install these.
949 */
950 #ifdef __i386
951 static void
952 reload_pae32(hat_t *hat, cpu_t *cpu)
953 {
954 x86pte_t *src;
955 x86pte_t *dest;
956 x86pte_t pte;
957 int i;
958
959 /*
960 * Load the 4 entries of the level 2 page table into this
961 * cpu's range of the vlp_page and point cr3 at them.
962 */
963 ASSERT(mmu.pae_hat);
964 src = hat->hat_vlp_ptes;
965 dest = vlp_page + (cpu->cpu_id + 1) * VLP_NUM_PTES;
966 for (i = 0; i < VLP_NUM_PTES; ++i) {
967 for (;;) {
968 pte = dest[i];
969 if (pte == src[i])
970 break;
971 if (atomic_cas_64(dest + i, pte, src[i]) != src[i])
972 break;
973 }
974 }
975 }
976 #endif
977
978 /*
979 * Switch to a new active hat, maintaining bit masks to track active CPUs.
980 *
981 * On the 32-bit PAE hypervisor, %cr3 is a 64-bit value, on metal it
982 * remains a 32-bit value.
983 */
984 void
985 hat_switch(hat_t *hat)
986 {
987 uint64_t newcr3;
988 cpu_t *cpu = CPU;
989 hat_t *old = cpu->cpu_current_hat;
990
991 /*
992 * set up this information first, so we don't miss any cross calls
993 */
994 if (old != NULL) {
995 if (old == hat)
996 return;
997 if (old != kas.a_hat)
998 CPUSET_ATOMIC_DEL(old->hat_cpus, cpu->cpu_id);
999 }
1000
1001 /*
1002 * Add this CPU to the active set for this HAT.
1003 */
1004 if (hat != kas.a_hat) {
1005 CPUSET_ATOMIC_ADD(hat->hat_cpus, cpu->cpu_id);
1006 }
1007 cpu->cpu_current_hat = hat;
1008
1009 /*
1010 * now go ahead and load cr3
1011 */
1012 if (hat->hat_flags & HAT_VLP) {
1013 #if defined(__amd64)
1014 x86pte_t *vlpptep = cpu->cpu_hat_info->hci_vlp_l2ptes;
1015
1016 VLP_COPY(hat->hat_vlp_ptes, vlpptep);
1017 newcr3 = MAKECR3(cpu->cpu_hat_info->hci_vlp_pfn);
1018 #elif defined(__i386)
1019 reload_pae32(hat, cpu);
1020 newcr3 = MAKECR3(kas.a_hat->hat_htable->ht_pfn) +
1021 (cpu->cpu_id + 1) * VLP_SIZE;
1022 #endif
1023 } else {
1024 newcr3 = MAKECR3((uint64_t)hat->hat_htable->ht_pfn);
1025 }
1026 #ifdef __xpv
1027 {
1028 struct mmuext_op t[2];
1029 uint_t retcnt;
1030 uint_t opcnt = 1;
1031
1032 t[0].cmd = MMUEXT_NEW_BASEPTR;
1033 t[0].arg1.mfn = mmu_btop(pa_to_ma(newcr3));
1034 #if defined(__amd64)
1035 /*
1036 * There's an interesting problem here, as to what to
1037 * actually specify when switching to the kernel hat.
1038 * For now we'll reuse the kernel hat again.
1039 */
1040 t[1].cmd = MMUEXT_NEW_USER_BASEPTR;
1041 if (hat == kas.a_hat)
1042 t[1].arg1.mfn = mmu_btop(pa_to_ma(newcr3));
1043 else
1044 t[1].arg1.mfn = pfn_to_mfn(hat->hat_user_ptable);
1045 ++opcnt;
1046 #endif /* __amd64 */
1047 if (HYPERVISOR_mmuext_op(t, opcnt, &retcnt, DOMID_SELF) < 0)
1048 panic("HYPERVISOR_mmu_update() failed");
1049 ASSERT(retcnt == opcnt);
1050
1051 }
1052 #else
1053 setcr3(newcr3);
1054 #endif
1055 ASSERT(cpu == CPU);
1056 }
1057
1058 /*
1059 * Utility to return a valid x86pte_t from protections, pfn, and level number
1060 */
1061 static x86pte_t
1062 hati_mkpte(pfn_t pfn, uint_t attr, level_t level, uint_t flags)
1063 {
1064 x86pte_t pte;
1065 uint_t cache_attr = attr & HAT_ORDER_MASK;
1066
1067 pte = MAKEPTE(pfn, level);
1068
1069 if (attr & PROT_WRITE)
1070 PTE_SET(pte, PT_WRITABLE);
1071
1072 if (attr & PROT_USER)
1073 PTE_SET(pte, PT_USER);
1074
1075 if (!(attr & PROT_EXEC))
1076 PTE_SET(pte, mmu.pt_nx);
1077
1078 /*
1079 * Set the software bits used track ref/mod sync's and hments.
1080 * If not using REF/MOD, set them to avoid h/w rewriting PTEs.
1081 */
1082 if (flags & HAT_LOAD_NOCONSIST)
1083 PTE_SET(pte, PT_NOCONSIST | PT_REF | PT_MOD);
1084 else if (attr & HAT_NOSYNC)
1085 PTE_SET(pte, PT_NOSYNC | PT_REF | PT_MOD);
1086
1087 /*
1088 * Set the caching attributes in the PTE. The combination
1089 * of attributes are poorly defined, so we pay attention
1090 * to them in the given order.
1091 *
1092 * The test for HAT_STRICTORDER is different because it's defined
1093 * as "0" - which was a stupid thing to do, but is too late to change!
1094 */
1095 if (cache_attr == HAT_STRICTORDER) {
1096 PTE_SET(pte, PT_NOCACHE);
1097 /*LINTED [Lint hates empty ifs, but it's the obvious way to do this] */
1098 } else if (cache_attr & (HAT_UNORDERED_OK | HAT_STORECACHING_OK)) {
1099 /* nothing to set */;
1100 } else if (cache_attr & (HAT_MERGING_OK | HAT_LOADCACHING_OK)) {
1101 PTE_SET(pte, PT_NOCACHE);
1102 if (is_x86_feature(x86_featureset, X86FSET_PAT))
1103 PTE_SET(pte, (level == 0) ? PT_PAT_4K : PT_PAT_LARGE);
1104 else
1105 PTE_SET(pte, PT_WRITETHRU);
1106 } else {
1107 panic("hati_mkpte(): bad caching attributes: %x\n", cache_attr);
1108 }
1109
1110 return (pte);
1111 }
1112
1113 /*
1114 * Duplicate address translations of the parent to the child.
1115 * This function really isn't used anymore.
1116 */
1117 /*ARGSUSED*/
1118 int
1119 hat_dup(hat_t *old, hat_t *new, caddr_t addr, size_t len, uint_t flag)
1120 {
1121 ASSERT((uintptr_t)addr < kernelbase);
1122 ASSERT(new != kas.a_hat);
1123 ASSERT(old != kas.a_hat);
1124 return (0);
1125 }
1126
1127 /*
1128 * Allocate any hat resources required for a process being swapped in.
1129 */
1130 /*ARGSUSED*/
1131 void
1132 hat_swapin(hat_t *hat)
1133 {
1134 /* do nothing - we let everything fault back in */
1135 }
1136
1137 /*
1138 * Unload all translations associated with an address space of a process
1139 * that is being swapped out.
1140 */
1141 void
1142 hat_swapout(hat_t *hat)
1143 {
1144 uintptr_t vaddr = (uintptr_t)0;
1145 uintptr_t eaddr = _userlimit;
1146 htable_t *ht = NULL;
1147 level_t l;
1148
1149 XPV_DISALLOW_MIGRATE();
1150 /*
1151 * We can't just call hat_unload(hat, 0, _userlimit...) here, because
1152 * seg_spt and shared pagetables can't be swapped out.
1153 * Take a look at segspt_shmswapout() - it's a big no-op.
1154 *
1155 * Instead we'll walk through all the address space and unload
1156 * any mappings which we are sure are not shared, not locked.
1157 */
1158 ASSERT(IS_PAGEALIGNED(vaddr));
1159 ASSERT(IS_PAGEALIGNED(eaddr));
1160 ASSERT(AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1161 if ((uintptr_t)hat->hat_as->a_userlimit < eaddr)
1162 eaddr = (uintptr_t)hat->hat_as->a_userlimit;
1163
1164 while (vaddr < eaddr) {
1165 (void) htable_walk(hat, &ht, &vaddr, eaddr);
1166 if (ht == NULL)
1167 break;
1168
1169 ASSERT(!IN_VA_HOLE(vaddr));
1170
1171 /*
1172 * If the page table is shared skip its entire range.
1173 */
1174 l = ht->ht_level;
1175 if (ht->ht_flags & HTABLE_SHARED_PFN) {
1176 vaddr = ht->ht_vaddr + LEVEL_SIZE(l + 1);
1177 htable_release(ht);
1178 ht = NULL;
1179 continue;
1180 }
1181
1182 /*
1183 * If the page table has no locked entries, unload this one.
1184 */
1185 if (ht->ht_lock_cnt == 0)
1186 hat_unload(hat, (caddr_t)vaddr, LEVEL_SIZE(l),
1187 HAT_UNLOAD_UNMAP);
1188
1189 /*
1190 * If we have a level 0 page table with locked entries,
1191 * skip the entire page table, otherwise skip just one entry.
1192 */
1193 if (ht->ht_lock_cnt > 0 && l == 0)
1194 vaddr = ht->ht_vaddr + LEVEL_SIZE(1);
1195 else
1196 vaddr += LEVEL_SIZE(l);
1197 }
1198 if (ht)
1199 htable_release(ht);
1200
1201 /*
1202 * We're in swapout because the system is low on memory, so
1203 * go back and flush all the htables off the cached list.
1204 */
1205 htable_purge_hat(hat);
1206 XPV_ALLOW_MIGRATE();
1207 }
1208
1209 /*
1210 * returns number of bytes that have valid mappings in hat.
1211 */
1212 size_t
1213 hat_get_mapped_size(hat_t *hat)
1214 {
1215 size_t total = 0;
1216 int l;
1217
1218 for (l = 0; l <= mmu.max_page_level; l++)
1219 total += (hat->hat_pages_mapped[l] << LEVEL_SHIFT(l));
1220 total += hat->hat_ism_pgcnt;
1221
1222 return (total);
1223 }
1224
1225 /*
1226 * enable/disable collection of stats for hat.
1227 */
1228 int
1229 hat_stats_enable(hat_t *hat)
1230 {
1231 atomic_inc_32(&hat->hat_stats);
1232 return (1);
1233 }
1234
1235 void
1236 hat_stats_disable(hat_t *hat)
1237 {
1238 atomic_dec_32(&hat->hat_stats);
1239 }
1240
1241 /*
1242 * Utility to sync the ref/mod bits from a page table entry to the page_t
1243 * We must be holding the mapping list lock when this is called.
1244 */
1245 static void
1246 hati_sync_pte_to_page(page_t *pp, x86pte_t pte, level_t level)
1247 {
1248 uint_t rm = 0;
1249 pgcnt_t pgcnt;
1250
1251 if (PTE_GET(pte, PT_SOFTWARE) >= PT_NOSYNC)
1252 return;
1253
1254 if (PTE_GET(pte, PT_REF))
1255 rm |= P_REF;
1256
1257 if (PTE_GET(pte, PT_MOD))
1258 rm |= P_MOD;
1259
1260 if (rm == 0)
1261 return;
1262
1263 /*
1264 * sync to all constituent pages of a large page
1265 */
1266 ASSERT(x86_hm_held(pp));
1267 pgcnt = page_get_pagecnt(level);
1268 ASSERT(IS_P2ALIGNED(pp->p_pagenum, pgcnt));
1269 for (; pgcnt > 0; --pgcnt) {
1270 /*
1271 * hat_page_demote() can't decrease
1272 * pszc below this mapping size
1273 * since this large mapping existed after we
1274 * took mlist lock.
1275 */
1276 ASSERT(pp->p_szc >= level);
1277 hat_page_setattr(pp, rm);
1278 ++pp;
1279 }
1280 }
1281
1282 /*
1283 * This the set of PTE bits for PFN, permissions and caching
1284 * that are allowed to change on a HAT_LOAD_REMAP
1285 */
1286 #define PT_REMAP_BITS \
1287 (PT_PADDR | PT_NX | PT_WRITABLE | PT_WRITETHRU | \
1288 PT_NOCACHE | PT_PAT_4K | PT_PAT_LARGE | PT_IGNORE | PT_REF | PT_MOD)
1289
1290 #define REMAPASSERT(EX) if (!(EX)) panic("hati_pte_map: " #EX)
1291 /*
1292 * Do the low-level work to get a mapping entered into a HAT's pagetables
1293 * and in the mapping list of the associated page_t.
1294 */
1295 static int
1296 hati_pte_map(
1297 htable_t *ht,
1298 uint_t entry,
1299 page_t *pp,
1300 x86pte_t pte,
1301 int flags,
1302 void *pte_ptr)
1303 {
1304 hat_t *hat = ht->ht_hat;
1305 x86pte_t old_pte;
1306 level_t l = ht->ht_level;
1307 hment_t *hm;
1308 uint_t is_consist;
1309 uint_t is_locked;
1310 int rv = 0;
1311
1312 /*
1313 * Is this a consistent (ie. need mapping list lock) mapping?
1314 */
1315 is_consist = (pp != NULL && (flags & HAT_LOAD_NOCONSIST) == 0);
1316
1317 /*
1318 * Track locked mapping count in the htable. Do this first,
1319 * as we track locking even if there already is a mapping present.
1320 */
1321 is_locked = (flags & HAT_LOAD_LOCK) != 0 && hat != kas.a_hat;
1322 if (is_locked)
1323 HTABLE_LOCK_INC(ht);
1324
1325 /*
1326 * Acquire the page's mapping list lock and get an hment to use.
1327 * Note that hment_prepare() might return NULL.
1328 */
1329 if (is_consist) {
1330 x86_hm_enter(pp);
1331 hm = hment_prepare(ht, entry, pp);
1332 }
1333
1334 /*
1335 * Set the new pte, retrieving the old one at the same time.
1336 */
1337 old_pte = x86pte_set(ht, entry, pte, pte_ptr);
1338
1339 /*
1340 * Did we get a large page / page table collision?
1341 */
1342 if (old_pte == LPAGE_ERROR) {
1343 if (is_locked)
1344 HTABLE_LOCK_DEC(ht);
1345 rv = -1;
1346 goto done;
1347 }
1348
1349 /*
1350 * If the mapping didn't change there is nothing more to do.
1351 */
1352 if (PTE_EQUIV(pte, old_pte))
1353 goto done;
1354
1355 /*
1356 * Install a new mapping in the page's mapping list
1357 */
1358 if (!PTE_ISVALID(old_pte)) {
1359 if (is_consist) {
1360 hment_assign(ht, entry, pp, hm);
1361 x86_hm_exit(pp);
1362 } else {
1363 ASSERT(flags & HAT_LOAD_NOCONSIST);
1364 }
1365 #if defined(__amd64)
1366 if (ht->ht_flags & HTABLE_VLP) {
1367 cpu_t *cpu = CPU;
1368 x86pte_t *vlpptep = cpu->cpu_hat_info->hci_vlp_l2ptes;
1369 VLP_COPY(hat->hat_vlp_ptes, vlpptep);
1370 }
1371 #endif
1372 HTABLE_INC(ht->ht_valid_cnt);
1373 PGCNT_INC(hat, l);
1374 return (rv);
1375 }
1376
1377 /*
1378 * Remap's are more complicated:
1379 * - HAT_LOAD_REMAP must be specified if changing the pfn.
1380 * We also require that NOCONSIST be specified.
1381 * - Otherwise only permission or caching bits may change.
1382 */
1383 if (!PTE_ISPAGE(old_pte, l))
1384 panic("non-null/page mapping pte=" FMT_PTE, old_pte);
1385
1386 if (PTE2PFN(old_pte, l) != PTE2PFN(pte, l)) {
1387 REMAPASSERT(flags & HAT_LOAD_REMAP);
1388 REMAPASSERT(flags & HAT_LOAD_NOCONSIST);
1389 REMAPASSERT(PTE_GET(old_pte, PT_SOFTWARE) >= PT_NOCONSIST);
1390 REMAPASSERT(pf_is_memory(PTE2PFN(old_pte, l)) ==
1391 pf_is_memory(PTE2PFN(pte, l)));
1392 REMAPASSERT(!is_consist);
1393 }
1394
1395 /*
1396 * We only let remaps change the certain bits in the PTE.
1397 */
1398 if (PTE_GET(old_pte, ~PT_REMAP_BITS) != PTE_GET(pte, ~PT_REMAP_BITS))
1399 panic("remap bits changed: old_pte="FMT_PTE", pte="FMT_PTE"\n",
1400 old_pte, pte);
1401
1402 /*
1403 * We don't create any mapping list entries on a remap, so release
1404 * any allocated hment after we drop the mapping list lock.
1405 */
1406 done:
1407 if (is_consist) {
1408 x86_hm_exit(pp);
1409 if (hm != NULL)
1410 hment_free(hm);
1411 }
1412 return (rv);
1413 }
1414
1415 /*
1416 * Internal routine to load a single page table entry. This only fails if
1417 * we attempt to overwrite a page table link with a large page.
1418 */
1419 static int
1420 hati_load_common(
1421 hat_t *hat,
1422 uintptr_t va,
1423 page_t *pp,
1424 uint_t attr,
1425 uint_t flags,
1426 level_t level,
1427 pfn_t pfn)
1428 {
1429 htable_t *ht;
1430 uint_t entry;
1431 x86pte_t pte;
1432 int rv = 0;
1433
1434 /*
1435 * The number 16 is arbitrary and here to catch a recursion problem
1436 * early before we blow out the kernel stack.
1437 */
1438 ++curthread->t_hatdepth;
1439 ASSERT(curthread->t_hatdepth < 16);
1440
1441 ASSERT(hat == kas.a_hat ||
1442 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1443
1444 if (flags & HAT_LOAD_SHARE)
1445 hat->hat_flags |= HAT_SHARED;
1446
1447 /*
1448 * Find the page table that maps this page if it already exists.
1449 */
1450 ht = htable_lookup(hat, va, level);
1451
1452 /*
1453 * We must have HAT_LOAD_NOCONSIST if page_t is NULL.
1454 */
1455 if (pp == NULL)
1456 flags |= HAT_LOAD_NOCONSIST;
1457
1458 if (ht == NULL) {
1459 ht = htable_create(hat, va, level, NULL);
1460 ASSERT(ht != NULL);
1461 }
1462 entry = htable_va2entry(va, ht);
1463
1464 /*
1465 * a bunch of paranoid error checking
1466 */
1467 ASSERT(ht->ht_busy > 0);
1468 if (ht->ht_vaddr > va || va > HTABLE_LAST_PAGE(ht))
1469 panic("hati_load_common: bad htable %p, va %p",
1470 (void *)ht, (void *)va);
1471 ASSERT(ht->ht_level == level);
1472
1473 /*
1474 * construct the new PTE
1475 */
1476 if (hat == kas.a_hat)
1477 attr &= ~PROT_USER;
1478 pte = hati_mkpte(pfn, attr, level, flags);
1479 if (hat == kas.a_hat && va >= kernelbase)
1480 PTE_SET(pte, mmu.pt_global);
1481
1482 /*
1483 * establish the mapping
1484 */
1485 rv = hati_pte_map(ht, entry, pp, pte, flags, NULL);
1486
1487 /*
1488 * release the htable and any reserves
1489 */
1490 htable_release(ht);
1491 --curthread->t_hatdepth;
1492 return (rv);
1493 }
1494
1495 /*
1496 * special case of hat_memload to deal with some kernel addrs for performance
1497 */
1498 static void
1499 hat_kmap_load(
1500 caddr_t addr,
1501 page_t *pp,
1502 uint_t attr,
1503 uint_t flags)
1504 {
1505 uintptr_t va = (uintptr_t)addr;
1506 x86pte_t pte;
1507 pfn_t pfn = page_pptonum(pp);
1508 pgcnt_t pg_off = mmu_btop(va - mmu.kmap_addr);
1509 htable_t *ht;
1510 uint_t entry;
1511 void *pte_ptr;
1512
1513 /*
1514 * construct the requested PTE
1515 */
1516 attr &= ~PROT_USER;
1517 attr |= HAT_STORECACHING_OK;
1518 pte = hati_mkpte(pfn, attr, 0, flags);
1519 PTE_SET(pte, mmu.pt_global);
1520
1521 /*
1522 * Figure out the pte_ptr and htable and use common code to finish up
1523 */
1524 if (mmu.pae_hat)
1525 pte_ptr = mmu.kmap_ptes + pg_off;
1526 else
1527 pte_ptr = (x86pte32_t *)mmu.kmap_ptes + pg_off;
1528 ht = mmu.kmap_htables[(va - mmu.kmap_htables[0]->ht_vaddr) >>
1529 LEVEL_SHIFT(1)];
1530 entry = htable_va2entry(va, ht);
1531 ++curthread->t_hatdepth;
1532 ASSERT(curthread->t_hatdepth < 16);
1533 (void) hati_pte_map(ht, entry, pp, pte, flags, pte_ptr);
1534 --curthread->t_hatdepth;
1535 }
1536
1537 /*
1538 * hat_memload() - load a translation to the given page struct
1539 *
1540 * Flags for hat_memload/hat_devload/hat_*attr.
1541 *
1542 * HAT_LOAD Default flags to load a translation to the page.
1543 *
1544 * HAT_LOAD_LOCK Lock down mapping resources; hat_map(), hat_memload(),
1545 * and hat_devload().
1546 *
1547 * HAT_LOAD_NOCONSIST Do not add mapping to page_t mapping list.
1548 * sets PT_NOCONSIST
1549 *
1550 * HAT_LOAD_SHARE A flag to hat_memload() to indicate h/w page tables
1551 * that map some user pages (not kas) is shared by more
1552 * than one process (eg. ISM).
1553 *
1554 * HAT_LOAD_REMAP Reload a valid pte with a different page frame.
1555 *
1556 * HAT_NO_KALLOC Do not kmem_alloc while creating the mapping; at this
1557 * point, it's setting up mapping to allocate internal
1558 * hat layer data structures. This flag forces hat layer
1559 * to tap its reserves in order to prevent infinite
1560 * recursion.
1561 *
1562 * The following is a protection attribute (like PROT_READ, etc.)
1563 *
1564 * HAT_NOSYNC set PT_NOSYNC - this mapping's ref/mod bits
1565 * are never cleared.
1566 *
1567 * Installing new valid PTE's and creation of the mapping list
1568 * entry are controlled under the same lock. It's derived from the
1569 * page_t being mapped.
1570 */
1571 static uint_t supported_memload_flags =
1572 HAT_LOAD | HAT_LOAD_LOCK | HAT_LOAD_ADV | HAT_LOAD_NOCONSIST |
1573 HAT_LOAD_SHARE | HAT_NO_KALLOC | HAT_LOAD_REMAP | HAT_LOAD_TEXT;
1574
1575 void
1576 hat_memload(
1577 hat_t *hat,
1578 caddr_t addr,
1579 page_t *pp,
1580 uint_t attr,
1581 uint_t flags)
1582 {
1583 uintptr_t va = (uintptr_t)addr;
1584 level_t level = 0;
1585 pfn_t pfn = page_pptonum(pp);
1586
1587 XPV_DISALLOW_MIGRATE();
1588 ASSERT(IS_PAGEALIGNED(va));
1589 ASSERT(hat == kas.a_hat || va < _userlimit);
1590 ASSERT(hat == kas.a_hat ||
1591 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1592 ASSERT((flags & supported_memload_flags) == flags);
1593
1594 ASSERT(!IN_VA_HOLE(va));
1595 ASSERT(!PP_ISFREE(pp));
1596
1597 /*
1598 * kernel address special case for performance.
1599 */
1600 if (mmu.kmap_addr <= va && va < mmu.kmap_eaddr) {
1601 ASSERT(hat == kas.a_hat);
1602 hat_kmap_load(addr, pp, attr, flags);
1603 XPV_ALLOW_MIGRATE();
1604 return;
1605 }
1606
1607 /*
1608 * This is used for memory with normal caching enabled, so
1609 * always set HAT_STORECACHING_OK.
1610 */
1611 attr |= HAT_STORECACHING_OK;
1612 if (hati_load_common(hat, va, pp, attr, flags, level, pfn) != 0)
1613 panic("unexpected hati_load_common() failure");
1614 XPV_ALLOW_MIGRATE();
1615 }
1616
1617 /* ARGSUSED */
1618 void
1619 hat_memload_region(struct hat *hat, caddr_t addr, struct page *pp,
1620 uint_t attr, uint_t flags, hat_region_cookie_t rcookie)
1621 {
1622 hat_memload(hat, addr, pp, attr, flags);
1623 }
1624
1625 /*
1626 * Load the given array of page structs using large pages when possible
1627 */
1628 void
1629 hat_memload_array(
1630 hat_t *hat,
1631 caddr_t addr,
1632 size_t len,
1633 page_t **pages,
1634 uint_t attr,
1635 uint_t flags)
1636 {
1637 uintptr_t va = (uintptr_t)addr;
1638 uintptr_t eaddr = va + len;
1639 level_t level;
1640 size_t pgsize;
1641 pgcnt_t pgindx = 0;
1642 pfn_t pfn;
1643 pgcnt_t i;
1644
1645 XPV_DISALLOW_MIGRATE();
1646 ASSERT(IS_PAGEALIGNED(va));
1647 ASSERT(hat == kas.a_hat || va + len <= _userlimit);
1648 ASSERT(hat == kas.a_hat ||
1649 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1650 ASSERT((flags & supported_memload_flags) == flags);
1651
1652 /*
1653 * memload is used for memory with full caching enabled, so
1654 * set HAT_STORECACHING_OK.
1655 */
1656 attr |= HAT_STORECACHING_OK;
1657
1658 /*
1659 * handle all pages using largest possible pagesize
1660 */
1661 while (va < eaddr) {
1662 /*
1663 * decide what level mapping to use (ie. pagesize)
1664 */
1665 pfn = page_pptonum(pages[pgindx]);
1666 for (level = mmu.max_page_level; ; --level) {
1667 pgsize = LEVEL_SIZE(level);
1668 if (level == 0)
1669 break;
1670
1671 if (!IS_P2ALIGNED(va, pgsize) ||
1672 (eaddr - va) < pgsize ||
1673 !IS_P2ALIGNED(pfn_to_pa(pfn), pgsize))
1674 continue;
1675
1676 /*
1677 * To use a large mapping of this size, all the
1678 * pages we are passed must be sequential subpages
1679 * of the large page.
1680 * hat_page_demote() can't change p_szc because
1681 * all pages are locked.
1682 */
1683 if (pages[pgindx]->p_szc >= level) {
1684 for (i = 0; i < mmu_btop(pgsize); ++i) {
1685 if (pfn + i !=
1686 page_pptonum(pages[pgindx + i]))
1687 break;
1688 ASSERT(pages[pgindx + i]->p_szc >=
1689 level);
1690 ASSERT(pages[pgindx] + i ==
1691 pages[pgindx + i]);
1692 }
1693 if (i == mmu_btop(pgsize)) {
1694 #ifdef DEBUG
1695 if (level == 2)
1696 map1gcnt++;
1697 #endif
1698 break;
1699 }
1700 }
1701 }
1702
1703 /*
1704 * Load this page mapping. If the load fails, try a smaller
1705 * pagesize.
1706 */
1707 ASSERT(!IN_VA_HOLE(va));
1708 while (hati_load_common(hat, va, pages[pgindx], attr,
1709 flags, level, pfn) != 0) {
1710 if (level == 0)
1711 panic("unexpected hati_load_common() failure");
1712 --level;
1713 pgsize = LEVEL_SIZE(level);
1714 }
1715
1716 /*
1717 * move to next page
1718 */
1719 va += pgsize;
1720 pgindx += mmu_btop(pgsize);
1721 }
1722 XPV_ALLOW_MIGRATE();
1723 }
1724
1725 /* ARGSUSED */
1726 void
1727 hat_memload_array_region(struct hat *hat, caddr_t addr, size_t len,
1728 struct page **pps, uint_t attr, uint_t flags,
1729 hat_region_cookie_t rcookie)
1730 {
1731 hat_memload_array(hat, addr, len, pps, attr, flags);
1732 }
1733
1734 /*
1735 * void hat_devload(hat, addr, len, pf, attr, flags)
1736 * load/lock the given page frame number
1737 *
1738 * Advisory ordering attributes. Apply only to device mappings.
1739 *
1740 * HAT_STRICTORDER: the CPU must issue the references in order, as the
1741 * programmer specified. This is the default.
1742 * HAT_UNORDERED_OK: the CPU may reorder the references (this is all kinds
1743 * of reordering; store or load with store or load).
1744 * HAT_MERGING_OK: merging and batching: the CPU may merge individual stores
1745 * to consecutive locations (for example, turn two consecutive byte
1746 * stores into one halfword store), and it may batch individual loads
1747 * (for example, turn two consecutive byte loads into one halfword load).
1748 * This also implies re-ordering.
1749 * HAT_LOADCACHING_OK: the CPU may cache the data it fetches and reuse it
1750 * until another store occurs. The default is to fetch new data
1751 * on every load. This also implies merging.
1752 * HAT_STORECACHING_OK: the CPU may keep the data in the cache and push it to
1753 * the device (perhaps with other data) at a later time. The default is
1754 * to push the data right away. This also implies load caching.
1755 *
1756 * Equivalent of hat_memload(), but can be used for device memory where
1757 * there are no page_t's and we support additional flags (write merging, etc).
1758 * Note that we can have large page mappings with this interface.
1759 */
1760 int supported_devload_flags = HAT_LOAD | HAT_LOAD_LOCK |
1761 HAT_LOAD_NOCONSIST | HAT_STRICTORDER | HAT_UNORDERED_OK |
1762 HAT_MERGING_OK | HAT_LOADCACHING_OK | HAT_STORECACHING_OK;
1763
1764 void
1765 hat_devload(
1766 hat_t *hat,
1767 caddr_t addr,
1768 size_t len,
1769 pfn_t pfn,
1770 uint_t attr,
1771 int flags)
1772 {
1773 uintptr_t va = ALIGN2PAGE(addr);
1774 uintptr_t eva = va + len;
1775 level_t level;
1776 size_t pgsize;
1777 page_t *pp;
1778 int f; /* per PTE copy of flags - maybe modified */
1779 uint_t a; /* per PTE copy of attr */
1780
1781 XPV_DISALLOW_MIGRATE();
1782 ASSERT(IS_PAGEALIGNED(va));
1783 ASSERT(hat == kas.a_hat || eva <= _userlimit);
1784 ASSERT(hat == kas.a_hat ||
1785 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1786 ASSERT((flags & supported_devload_flags) == flags);
1787
1788 /*
1789 * handle all pages
1790 */
1791 while (va < eva) {
1792
1793 /*
1794 * decide what level mapping to use (ie. pagesize)
1795 */
1796 for (level = mmu.max_page_level; ; --level) {
1797 pgsize = LEVEL_SIZE(level);
1798 if (level == 0)
1799 break;
1800 if (IS_P2ALIGNED(va, pgsize) &&
1801 (eva - va) >= pgsize &&
1802 IS_P2ALIGNED(pfn, mmu_btop(pgsize))) {
1803 #ifdef DEBUG
1804 if (level == 2)
1805 map1gcnt++;
1806 #endif
1807 break;
1808 }
1809 }
1810
1811 /*
1812 * If this is just memory then allow caching (this happens
1813 * for the nucleus pages) - though HAT_PLAT_NOCACHE can be used
1814 * to override that. If we don't have a page_t then make sure
1815 * NOCONSIST is set.
1816 */
1817 a = attr;
1818 f = flags;
1819 if (!pf_is_memory(pfn))
1820 f |= HAT_LOAD_NOCONSIST;
1821 else if (!(a & HAT_PLAT_NOCACHE))
1822 a |= HAT_STORECACHING_OK;
1823
1824 if (f & HAT_LOAD_NOCONSIST)
1825 pp = NULL;
1826 else
1827 pp = page_numtopp_nolock(pfn);
1828
1829 /*
1830 * Check to make sure we are really trying to map a valid
1831 * memory page. The caller wishing to intentionally map
1832 * free memory pages will have passed the HAT_LOAD_NOCONSIST
1833 * flag, then pp will be NULL.
1834 */
1835 if (pp != NULL) {
1836 if (PP_ISFREE(pp)) {
1837 panic("hat_devload: loading "
1838 "a mapping to free page %p", (void *)pp);
1839 }
1840
1841 if (!PAGE_LOCKED(pp) && !PP_ISNORELOC(pp)) {
1842 panic("hat_devload: loading a mapping "
1843 "to an unlocked page %p",
1844 (void *)pp);
1845 }
1846 }
1847
1848 /*
1849 * load this page mapping
1850 */
1851 ASSERT(!IN_VA_HOLE(va));
1852 while (hati_load_common(hat, va, pp, a, f, level, pfn) != 0) {
1853 if (level == 0)
1854 panic("unexpected hati_load_common() failure");
1855 --level;
1856 pgsize = LEVEL_SIZE(level);
1857 }
1858
1859 /*
1860 * move to next page
1861 */
1862 va += pgsize;
1863 pfn += mmu_btop(pgsize);
1864 }
1865 XPV_ALLOW_MIGRATE();
1866 }
1867
1868 /*
1869 * void hat_unlock(hat, addr, len)
1870 * unlock the mappings to a given range of addresses
1871 *
1872 * Locks are tracked by ht_lock_cnt in the htable.
1873 */
1874 void
1875 hat_unlock(hat_t *hat, caddr_t addr, size_t len)
1876 {
1877 uintptr_t vaddr = (uintptr_t)addr;
1878 uintptr_t eaddr = vaddr + len;
1879 htable_t *ht = NULL;
1880
1881 /*
1882 * kernel entries are always locked, we don't track lock counts
1883 */
1884 ASSERT(hat == kas.a_hat || eaddr <= _userlimit);
1885 ASSERT(IS_PAGEALIGNED(vaddr));
1886 ASSERT(IS_PAGEALIGNED(eaddr));
1887 if (hat == kas.a_hat)
1888 return;
1889 if (eaddr > _userlimit)
1890 panic("hat_unlock() address out of range - above _userlimit");
1891
1892 XPV_DISALLOW_MIGRATE();
1893 ASSERT(AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
1894 while (vaddr < eaddr) {
1895 (void) htable_walk(hat, &ht, &vaddr, eaddr);
1896 if (ht == NULL)
1897 break;
1898
1899 ASSERT(!IN_VA_HOLE(vaddr));
1900
1901 if (ht->ht_lock_cnt < 1)
1902 panic("hat_unlock(): lock_cnt < 1, "
1903 "htable=%p, vaddr=%p\n", (void *)ht, (void *)vaddr);
1904 HTABLE_LOCK_DEC(ht);
1905
1906 vaddr += LEVEL_SIZE(ht->ht_level);
1907 }
1908 if (ht)
1909 htable_release(ht);
1910 XPV_ALLOW_MIGRATE();
1911 }
1912
1913 /* ARGSUSED */
1914 void
1915 hat_unlock_region(struct hat *hat, caddr_t addr, size_t len,
1916 hat_region_cookie_t rcookie)
1917 {
1918 panic("No shared region support on x86");
1919 }
1920
1921 #if !defined(__xpv)
1922 /*
1923 * Cross call service routine to demap a virtual page on
1924 * the current CPU or flush all mappings in TLB.
1925 */
1926 /*ARGSUSED*/
1927 static int
1928 hati_demap_func(xc_arg_t a1, xc_arg_t a2, xc_arg_t a3)
1929 {
1930 hat_t *hat = (hat_t *)a1;
1931 caddr_t addr = (caddr_t)a2;
1932 size_t len = (size_t)a3;
1933
1934 /*
1935 * If the target hat isn't the kernel and this CPU isn't operating
1936 * in the target hat, we can ignore the cross call.
1937 */
1938 if (hat != kas.a_hat && hat != CPU->cpu_current_hat)
1939 return (0);
1940
1941 /*
1942 * For a normal address, we flush a range of contiguous mappings
1943 */
1944 if ((uintptr_t)addr != DEMAP_ALL_ADDR) {
1945 for (size_t i = 0; i < len; i += MMU_PAGESIZE)
1946 mmu_tlbflush_entry(addr + i);
1947 return (0);
1948 }
1949
1950 /*
1951 * Otherwise we reload cr3 to effect a complete TLB flush.
1952 *
1953 * A reload of cr3 on a VLP process also means we must also recopy in
1954 * the pte values from the struct hat
1955 */
1956 if (hat->hat_flags & HAT_VLP) {
1957 #if defined(__amd64)
1958 x86pte_t *vlpptep = CPU->cpu_hat_info->hci_vlp_l2ptes;
1959
1960 VLP_COPY(hat->hat_vlp_ptes, vlpptep);
1961 #elif defined(__i386)
1962 reload_pae32(hat, CPU);
1963 #endif
1964 }
1965 reload_cr3();
1966 return (0);
1967 }
1968
1969 /*
1970 * Flush all TLB entries, including global (ie. kernel) ones.
1971 */
1972 static void
1973 flush_all_tlb_entries(void)
1974 {
1975 ulong_t cr4 = getcr4();
1976
1977 if (cr4 & CR4_PGE) {
1978 setcr4(cr4 & ~(ulong_t)CR4_PGE);
1979 setcr4(cr4);
1980
1981 /*
1982 * 32 bit PAE also needs to always reload_cr3()
1983 */
1984 if (mmu.max_level == 2)
1985 reload_cr3();
1986 } else {
1987 reload_cr3();
1988 }
1989 }
1990
1991 #define TLB_CPU_HALTED (01ul)
1992 #define TLB_INVAL_ALL (02ul)
1993 #define CAS_TLB_INFO(cpu, old, new) \
1994 atomic_cas_ulong((ulong_t *)&(cpu)->cpu_m.mcpu_tlb_info, (old), (new))
1995
1996 /*
1997 * Record that a CPU is going idle
1998 */
1999 void
2000 tlb_going_idle(void)
2001 {
2002 atomic_or_ulong((ulong_t *)&CPU->cpu_m.mcpu_tlb_info, TLB_CPU_HALTED);
2003 }
2004
2005 /*
2006 * Service a delayed TLB flush if coming out of being idle.
2007 * It will be called from cpu idle notification with interrupt disabled.
2008 */
2009 void
2010 tlb_service(void)
2011 {
2012 ulong_t tlb_info;
2013 ulong_t found;
2014
2015 /*
2016 * We only have to do something if coming out of being idle.
2017 */
2018 tlb_info = CPU->cpu_m.mcpu_tlb_info;
2019 if (tlb_info & TLB_CPU_HALTED) {
2020 ASSERT(CPU->cpu_current_hat == kas.a_hat);
2021
2022 /*
2023 * Atomic clear and fetch of old state.
2024 */
2025 while ((found = CAS_TLB_INFO(CPU, tlb_info, 0)) != tlb_info) {
2026 ASSERT(found & TLB_CPU_HALTED);
2027 tlb_info = found;
2028 SMT_PAUSE();
2029 }
2030 if (tlb_info & TLB_INVAL_ALL)
2031 flush_all_tlb_entries();
2032 }
2033 }
2034 #endif /* !__xpv */
2035
2036 /*
2037 * Internal routine to do cross calls to invalidate a range of pages on
2038 * all CPUs using a given hat.
2039 */
2040 void
2041 hat_tlb_inval_range(hat_t *hat, uintptr_t va, size_t len)
2042 {
2043 extern int flushes_require_xcalls; /* from mp_startup.c */
2044 cpuset_t justme;
2045 cpuset_t cpus_to_shootdown;
2046 #ifndef __xpv
2047 cpuset_t check_cpus;
2048 cpu_t *cpup;
2049 int c;
2050 #endif
2051
2052 /*
2053 * If the hat is being destroyed, there are no more users, so
2054 * demap need not do anything.
2055 */
2056 if (hat->hat_flags & HAT_FREEING)
2057 return;
2058
2059 /*
2060 * If demapping from a shared pagetable, we best demap the
2061 * entire set of user TLBs, since we don't know what addresses
2062 * these were shared at.
2063 */
2064 if (hat->hat_flags & HAT_SHARED) {
2065 hat = kas.a_hat;
2066 va = DEMAP_ALL_ADDR;
2067 }
2068
2069 /*
2070 * if not running with multiple CPUs, don't use cross calls
2071 */
2072 if (panicstr || !flushes_require_xcalls) {
2073 #ifdef __xpv
2074 if (va == DEMAP_ALL_ADDR) {
2075 xen_flush_tlb();
2076 } else {
2077 for (size_t i = 0; i < len; i += MMU_PAGESIZE)
2078 xen_flush_va((caddr_t)(va + i));
2079 }
2080 #else
2081 (void) hati_demap_func((xc_arg_t)hat,
2082 (xc_arg_t)va, (xc_arg_t)len);
2083 #endif
2084 return;
2085 }
2086
2087
2088 /*
2089 * Determine CPUs to shootdown. Kernel changes always do all CPUs.
2090 * Otherwise it's just CPUs currently executing in this hat.
2091 */
2092 kpreempt_disable();
2093 CPUSET_ONLY(justme, CPU->cpu_id);
2094 if (hat == kas.a_hat)
2095 cpus_to_shootdown = khat_cpuset;
2096 else
2097 cpus_to_shootdown = hat->hat_cpus;
2098
2099 #ifndef __xpv
2100 /*
2101 * If any CPUs in the set are idle, just request a delayed flush
2102 * and avoid waking them up.
2103 */
2104 check_cpus = cpus_to_shootdown;
2105 for (c = 0; c < NCPU && !CPUSET_ISNULL(check_cpus); ++c) {
2106 ulong_t tlb_info;
2107
2108 if (!CPU_IN_SET(check_cpus, c))
2109 continue;
2110 CPUSET_DEL(check_cpus, c);
2111 cpup = cpu[c];
2112 if (cpup == NULL)
2113 continue;
2114
2115 tlb_info = cpup->cpu_m.mcpu_tlb_info;
2116 while (tlb_info == TLB_CPU_HALTED) {
2117 (void) CAS_TLB_INFO(cpup, TLB_CPU_HALTED,
2118 TLB_CPU_HALTED | TLB_INVAL_ALL);
2119 SMT_PAUSE();
2120 tlb_info = cpup->cpu_m.mcpu_tlb_info;
2121 }
2122 if (tlb_info == (TLB_CPU_HALTED | TLB_INVAL_ALL)) {
2123 HATSTAT_INC(hs_tlb_inval_delayed);
2124 CPUSET_DEL(cpus_to_shootdown, c);
2125 }
2126 }
2127 #endif
2128
2129 if (CPUSET_ISNULL(cpus_to_shootdown) ||
2130 CPUSET_ISEQUAL(cpus_to_shootdown, justme)) {
2131
2132 #ifdef __xpv
2133 if (va == DEMAP_ALL_ADDR) {
2134 xen_flush_tlb();
2135 } else {
2136 for (size_t i = 0; i < len; i += MMU_PAGESIZE)
2137 xen_flush_va((caddr_t)(va + i));
2138 }
2139 #else
2140 (void) hati_demap_func((xc_arg_t)hat,
2141 (xc_arg_t)va, (xc_arg_t)len);
2142 #endif
2143
2144 } else {
2145
2146 CPUSET_ADD(cpus_to_shootdown, CPU->cpu_id);
2147 #ifdef __xpv
2148 if (va == DEMAP_ALL_ADDR) {
2149 xen_gflush_tlb(cpus_to_shootdown);
2150 } else {
2151 for (size_t i = 0; i < len; i += MMU_PAGESIZE) {
2152 xen_gflush_va((caddr_t)(va + i),
2153 cpus_to_shootdown);
2154 }
2155 }
2156 #else
2157 xc_call((xc_arg_t)hat, (xc_arg_t)va, (xc_arg_t)len,
2158 CPUSET2BV(cpus_to_shootdown), hati_demap_func);
2159 #endif
2160
2161 }
2162 kpreempt_enable();
2163 }
2164
2165 void
2166 hat_tlb_inval(hat_t *hat, uintptr_t va)
2167 {
2168 hat_tlb_inval_range(hat, va, MMU_PAGESIZE);
2169 }
2170
2171 /*
2172 * Interior routine for HAT_UNLOADs from hat_unload_callback(),
2173 * hat_kmap_unload() OR from hat_steal() code. This routine doesn't
2174 * handle releasing of the htables.
2175 */
2176 void
2177 hat_pte_unmap(
2178 htable_t *ht,
2179 uint_t entry,
2180 uint_t flags,
2181 x86pte_t old_pte,
2182 void *pte_ptr,
2183 boolean_t tlb)
2184 {
2185 hat_t *hat = ht->ht_hat;
2186 hment_t *hm = NULL;
2187 page_t *pp = NULL;
2188 level_t l = ht->ht_level;
2189 pfn_t pfn;
2190
2191 /*
2192 * We always track the locking counts, even if nothing is unmapped
2193 */
2194 if ((flags & HAT_UNLOAD_UNLOCK) != 0 && hat != kas.a_hat) {
2195 ASSERT(ht->ht_lock_cnt > 0);
2196 HTABLE_LOCK_DEC(ht);
2197 }
2198
2199 /*
2200 * Figure out which page's mapping list lock to acquire using the PFN
2201 * passed in "old" PTE. We then attempt to invalidate the PTE.
2202 * If another thread, probably a hat_pageunload, has asynchronously
2203 * unmapped/remapped this address we'll loop here.
2204 */
2205 ASSERT(ht->ht_busy > 0);
2206 while (PTE_ISVALID(old_pte)) {
2207 pfn = PTE2PFN(old_pte, l);
2208 if (PTE_GET(old_pte, PT_SOFTWARE) >= PT_NOCONSIST) {
2209 pp = NULL;
2210 } else {
2211 #ifdef __xpv
2212 if (pfn == PFN_INVALID)
2213 panic("Invalid PFN, but not PT_NOCONSIST");
2214 #endif
2215 pp = page_numtopp_nolock(pfn);
2216 if (pp == NULL) {
2217 panic("no page_t, not NOCONSIST: old_pte="
2218 FMT_PTE " ht=%lx entry=0x%x pte_ptr=%lx",
2219 old_pte, (uintptr_t)ht, entry,
2220 (uintptr_t)pte_ptr);
2221 }
2222 x86_hm_enter(pp);
2223 }
2224
2225 old_pte = x86pte_inval(ht, entry, old_pte, pte_ptr, tlb);
2226
2227 /*
2228 * If the page hadn't changed we've unmapped it and can proceed
2229 */
2230 if (PTE_ISVALID(old_pte) && PTE2PFN(old_pte, l) == pfn)
2231 break;
2232
2233 /*
2234 * Otherwise, we'll have to retry with the current old_pte.
2235 * Drop the hment lock, since the pfn may have changed.
2236 */
2237 if (pp != NULL) {
2238 x86_hm_exit(pp);
2239 pp = NULL;
2240 } else {
2241 ASSERT(PTE_GET(old_pte, PT_SOFTWARE) >= PT_NOCONSIST);
2242 }
2243 }
2244
2245 /*
2246 * If the old mapping wasn't valid, there's nothing more to do
2247 */
2248 if (!PTE_ISVALID(old_pte)) {
2249 if (pp != NULL)
2250 x86_hm_exit(pp);
2251 return;
2252 }
2253
2254 /*
2255 * Take care of syncing any MOD/REF bits and removing the hment.
2256 */
2257 if (pp != NULL) {
2258 if (!(flags & HAT_UNLOAD_NOSYNC))
2259 hati_sync_pte_to_page(pp, old_pte, l);
2260 hm = hment_remove(pp, ht, entry);
2261 x86_hm_exit(pp);
2262 if (hm != NULL)
2263 hment_free(hm);
2264 }
2265
2266 /*
2267 * Handle book keeping in the htable and hat
2268 */
2269 ASSERT(ht->ht_valid_cnt > 0);
2270 HTABLE_DEC(ht->ht_valid_cnt);
2271 PGCNT_DEC(hat, l);
2272 }
2273
2274 /*
2275 * very cheap unload implementation to special case some kernel addresses
2276 */
2277 static void
2278 hat_kmap_unload(caddr_t addr, size_t len, uint_t flags)
2279 {
2280 uintptr_t va = (uintptr_t)addr;
2281 uintptr_t eva = va + len;
2282 pgcnt_t pg_index;
2283 htable_t *ht;
2284 uint_t entry;
2285 x86pte_t *pte_ptr;
2286 x86pte_t old_pte;
2287
2288 for (; va < eva; va += MMU_PAGESIZE) {
2289 /*
2290 * Get the PTE
2291 */
2292 pg_index = mmu_btop(va - mmu.kmap_addr);
2293 pte_ptr = PT_INDEX_PTR(mmu.kmap_ptes, pg_index);
2294 old_pte = GET_PTE(pte_ptr);
2295
2296 /*
2297 * get the htable / entry
2298 */
2299 ht = mmu.kmap_htables[(va - mmu.kmap_htables[0]->ht_vaddr)
2300 >> LEVEL_SHIFT(1)];
2301 entry = htable_va2entry(va, ht);
2302
2303 /*
2304 * use mostly common code to unmap it.
2305 */
2306 hat_pte_unmap(ht, entry, flags, old_pte, pte_ptr, B_TRUE);
2307 }
2308 }
2309
2310
2311 /*
2312 * unload a range of virtual address space (no callback)
2313 */
2314 void
2315 hat_unload(hat_t *hat, caddr_t addr, size_t len, uint_t flags)
2316 {
2317 uintptr_t va = (uintptr_t)addr;
2318
2319 XPV_DISALLOW_MIGRATE();
2320 ASSERT(hat == kas.a_hat || va + len <= _userlimit);
2321
2322 /*
2323 * special case for performance.
2324 */
2325 if (mmu.kmap_addr <= va && va < mmu.kmap_eaddr) {
2326 ASSERT(hat == kas.a_hat);
2327 hat_kmap_unload(addr, len, flags);
2328 } else {
2329 hat_unload_callback(hat, addr, len, flags, NULL);
2330 }
2331 XPV_ALLOW_MIGRATE();
2332 }
2333
2334 /*
2335 * Do the callbacks for ranges being unloaded.
2336 */
2337 typedef struct range_info {
2338 uintptr_t rng_va;
2339 ulong_t rng_cnt;
2340 level_t rng_level;
2341 } range_info_t;
2342
2343 /*
2344 * Invalidate the TLB, and perform the callback to the upper level VM system,
2345 * for the specified ranges of contiguous pages.
2346 */
2347 static void
2348 handle_ranges(hat_t *hat, hat_callback_t *cb, uint_t cnt, range_info_t *range)
2349 {
2350 while (cnt > 0) {
2351 size_t len;
2352
2353 --cnt;
2354 len = range[cnt].rng_cnt << LEVEL_SHIFT(range[cnt].rng_level);
2355 hat_tlb_inval_range(hat, (uintptr_t)range[cnt].rng_va, len);
2356
2357 if (cb != NULL) {
2358 cb->hcb_start_addr = (caddr_t)range[cnt].rng_va;
2359 cb->hcb_end_addr = cb->hcb_start_addr;
2360 cb->hcb_end_addr += len;
2361 cb->hcb_function(cb);
2362 }
2363 }
2364 }
2365
2366 /*
2367 * Unload a given range of addresses (has optional callback)
2368 *
2369 * Flags:
2370 * define HAT_UNLOAD 0x00
2371 * define HAT_UNLOAD_NOSYNC 0x02
2372 * define HAT_UNLOAD_UNLOCK 0x04
2373 * define HAT_UNLOAD_OTHER 0x08 - not used
2374 * define HAT_UNLOAD_UNMAP 0x10 - same as HAT_UNLOAD
2375 */
2376 #define MAX_UNLOAD_CNT (8)
2377 void
2378 hat_unload_callback(
2379 hat_t *hat,
2380 caddr_t addr,
2381 size_t len,
2382 uint_t flags,
2383 hat_callback_t *cb)
2384 {
2385 uintptr_t vaddr = (uintptr_t)addr;
2386 uintptr_t eaddr = vaddr + len;
2387 htable_t *ht = NULL;
2388 uint_t entry;
2389 uintptr_t contig_va = (uintptr_t)-1L;
2390 range_info_t r[MAX_UNLOAD_CNT];
2391 uint_t r_cnt = 0;
2392 x86pte_t old_pte;
2393
2394 XPV_DISALLOW_MIGRATE();
2395 ASSERT(hat == kas.a_hat || eaddr <= _userlimit);
2396 ASSERT(IS_PAGEALIGNED(vaddr));
2397 ASSERT(IS_PAGEALIGNED(eaddr));
2398
2399 /*
2400 * Special case a single page being unloaded for speed. This happens
2401 * quite frequently, COW faults after a fork() for example.
2402 */
2403 if (cb == NULL && len == MMU_PAGESIZE) {
2404 ht = htable_getpte(hat, vaddr, &entry, &old_pte, 0);
2405 if (ht != NULL) {
2406 if (PTE_ISVALID(old_pte)) {
2407 hat_pte_unmap(ht, entry, flags, old_pte,
2408 NULL, B_TRUE);
2409 }
2410 htable_release(ht);
2411 }
2412 XPV_ALLOW_MIGRATE();
2413 return;
2414 }
2415
2416 while (vaddr < eaddr) {
2417 old_pte = htable_walk(hat, &ht, &vaddr, eaddr);
2418 if (ht == NULL)
2419 break;
2420
2421 ASSERT(!IN_VA_HOLE(vaddr));
2422
2423 if (vaddr < (uintptr_t)addr)
2424 panic("hat_unload_callback(): unmap inside large page");
2425
2426 /*
2427 * We'll do the call backs for contiguous ranges
2428 */
2429 if (vaddr != contig_va ||
2430 (r_cnt > 0 && r[r_cnt - 1].rng_level != ht->ht_level)) {
2431 if (r_cnt == MAX_UNLOAD_CNT) {
2432 handle_ranges(hat, cb, r_cnt, r);
2433 r_cnt = 0;
2434 }
2435 r[r_cnt].rng_va = vaddr;
2436 r[r_cnt].rng_cnt = 0;
2437 r[r_cnt].rng_level = ht->ht_level;
2438 ++r_cnt;
2439 }
2440
2441 /*
2442 * Unload one mapping (for a single page) from the page tables.
2443 * Note that we do not remove the mapping from the TLB yet,
2444 * as indicated by the tlb=FALSE argument to hat_pte_unmap().
2445 * handle_ranges() will clear the TLB entries with one call to
2446 * hat_tlb_inval_range() per contiguous range. This is
2447 * safe because the page can not be reused until the
2448 * callback is made (or we return).
2449 */
2450 entry = htable_va2entry(vaddr, ht);
2451 hat_pte_unmap(ht, entry, flags, old_pte, NULL, B_FALSE);
2452 ASSERT(ht->ht_level <= mmu.max_page_level);
2453 vaddr += LEVEL_SIZE(ht->ht_level);
2454 contig_va = vaddr;
2455 ++r[r_cnt - 1].rng_cnt;
2456 }
2457 if (ht)
2458 htable_release(ht);
2459
2460 /*
2461 * handle last range for callbacks
2462 */
2463 if (r_cnt > 0)
2464 handle_ranges(hat, cb, r_cnt, r);
2465 XPV_ALLOW_MIGRATE();
2466 }
2467
2468 /*
2469 * Invalidate a virtual address translation on a slave CPU during
2470 * panic() dumps.
2471 */
2472 void
2473 hat_flush_range(hat_t *hat, caddr_t va, size_t size)
2474 {
2475 ssize_t sz;
2476 caddr_t endva = va + size;
2477
2478 while (va < endva) {
2479 sz = hat_getpagesize(hat, va);
2480 if (sz < 0) {
2481 #ifdef __xpv
2482 xen_flush_tlb();
2483 #else
2484 flush_all_tlb_entries();
2485 #endif
2486 break;
2487 }
2488 #ifdef __xpv
2489 xen_flush_va(va);
2490 #else
2491 mmu_tlbflush_entry(va);
2492 #endif
2493 va += sz;
2494 }
2495 }
2496
2497 /*
2498 * synchronize mapping with software data structures
2499 *
2500 * This interface is currently only used by the working set monitor
2501 * driver.
2502 */
2503 /*ARGSUSED*/
2504 void
2505 hat_sync(hat_t *hat, caddr_t addr, size_t len, uint_t flags)
2506 {
2507 uintptr_t vaddr = (uintptr_t)addr;
2508 uintptr_t eaddr = vaddr + len;
2509 htable_t *ht = NULL;
2510 uint_t entry;
2511 x86pte_t pte;
2512 x86pte_t save_pte;
2513 x86pte_t new;
2514 page_t *pp;
2515
2516 ASSERT(!IN_VA_HOLE(vaddr));
2517 ASSERT(IS_PAGEALIGNED(vaddr));
2518 ASSERT(IS_PAGEALIGNED(eaddr));
2519 ASSERT(hat == kas.a_hat || eaddr <= _userlimit);
2520
2521 XPV_DISALLOW_MIGRATE();
2522 for (; vaddr < eaddr; vaddr += LEVEL_SIZE(ht->ht_level)) {
2523 try_again:
2524 pte = htable_walk(hat, &ht, &vaddr, eaddr);
2525 if (ht == NULL)
2526 break;
2527 entry = htable_va2entry(vaddr, ht);
2528
2529 if (PTE_GET(pte, PT_SOFTWARE) >= PT_NOSYNC ||
2530 PTE_GET(pte, PT_REF | PT_MOD) == 0)
2531 continue;
2532
2533 /*
2534 * We need to acquire the mapping list lock to protect
2535 * against hat_pageunload(), hat_unload(), etc.
2536 */
2537 pp = page_numtopp_nolock(PTE2PFN(pte, ht->ht_level));
2538 if (pp == NULL)
2539 break;
2540 x86_hm_enter(pp);
2541 save_pte = pte;
2542 pte = x86pte_get(ht, entry);
2543 if (pte != save_pte) {
2544 x86_hm_exit(pp);
2545 goto try_again;
2546 }
2547 if (PTE_GET(pte, PT_SOFTWARE) >= PT_NOSYNC ||
2548 PTE_GET(pte, PT_REF | PT_MOD) == 0) {
2549 x86_hm_exit(pp);
2550 continue;
2551 }
2552
2553 /*
2554 * Need to clear ref or mod bits. We may compete with
2555 * hardware updating the R/M bits and have to try again.
2556 */
2557 if (flags == HAT_SYNC_ZERORM) {
2558 new = pte;
2559 PTE_CLR(new, PT_REF | PT_MOD);
2560 pte = hati_update_pte(ht, entry, pte, new);
2561 if (pte != 0) {
2562 x86_hm_exit(pp);
2563 goto try_again;
2564 }
2565 } else {
2566 /*
2567 * sync the PTE to the page_t
2568 */
2569 hati_sync_pte_to_page(pp, save_pte, ht->ht_level);
2570 }
2571 x86_hm_exit(pp);
2572 }
2573 if (ht)
2574 htable_release(ht);
2575 XPV_ALLOW_MIGRATE();
2576 }
2577
2578 /*
2579 * void hat_map(hat, addr, len, flags)
2580 */
2581 /*ARGSUSED*/
2582 void
2583 hat_map(hat_t *hat, caddr_t addr, size_t len, uint_t flags)
2584 {
2585 /* does nothing */
2586 }
2587
2588 /*
2589 * uint_t hat_getattr(hat, addr, *attr)
2590 * returns attr for <hat,addr> in *attr. returns 0 if there was a
2591 * mapping and *attr is valid, nonzero if there was no mapping and
2592 * *attr is not valid.
2593 */
2594 uint_t
2595 hat_getattr(hat_t *hat, caddr_t addr, uint_t *attr)
2596 {
2597 uintptr_t vaddr = ALIGN2PAGE(addr);
2598 htable_t *ht = NULL;
2599 x86pte_t pte;
2600
2601 ASSERT(hat == kas.a_hat || vaddr <= _userlimit);
2602
2603 if (IN_VA_HOLE(vaddr))
2604 return ((uint_t)-1);
2605
2606 ht = htable_getpte(hat, vaddr, NULL, &pte, mmu.max_page_level);
2607 if (ht == NULL)
2608 return ((uint_t)-1);
2609
2610 if (!PTE_ISVALID(pte) || !PTE_ISPAGE(pte, ht->ht_level)) {
2611 htable_release(ht);
2612 return ((uint_t)-1);
2613 }
2614
2615 *attr = PROT_READ;
2616 if (PTE_GET(pte, PT_WRITABLE))
2617 *attr |= PROT_WRITE;
2618 if (PTE_GET(pte, PT_USER))
2619 *attr |= PROT_USER;
2620 if (!PTE_GET(pte, mmu.pt_nx))
2621 *attr |= PROT_EXEC;
2622 if (PTE_GET(pte, PT_SOFTWARE) >= PT_NOSYNC)
2623 *attr |= HAT_NOSYNC;
2624 htable_release(ht);
2625 return (0);
2626 }
2627
2628 /*
2629 * hat_updateattr() applies the given attribute change to an existing mapping
2630 */
2631 #define HAT_LOAD_ATTR 1
2632 #define HAT_SET_ATTR 2
2633 #define HAT_CLR_ATTR 3
2634
2635 static void
2636 hat_updateattr(hat_t *hat, caddr_t addr, size_t len, uint_t attr, int what)
2637 {
2638 uintptr_t vaddr = (uintptr_t)addr;
2639 uintptr_t eaddr = (uintptr_t)addr + len;
2640 htable_t *ht = NULL;
2641 uint_t entry;
2642 x86pte_t oldpte, newpte;
2643 page_t *pp;
2644
2645 XPV_DISALLOW_MIGRATE();
2646 ASSERT(IS_PAGEALIGNED(vaddr));
2647 ASSERT(IS_PAGEALIGNED(eaddr));
2648 ASSERT(hat == kas.a_hat ||
2649 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
2650 for (; vaddr < eaddr; vaddr += LEVEL_SIZE(ht->ht_level)) {
2651 try_again:
2652 oldpte = htable_walk(hat, &ht, &vaddr, eaddr);
2653 if (ht == NULL)
2654 break;
2655 if (PTE_GET(oldpte, PT_SOFTWARE) >= PT_NOCONSIST)
2656 continue;
2657
2658 pp = page_numtopp_nolock(PTE2PFN(oldpte, ht->ht_level));
2659 if (pp == NULL)
2660 continue;
2661 x86_hm_enter(pp);
2662
2663 newpte = oldpte;
2664 /*
2665 * We found a page table entry in the desired range,
2666 * figure out the new attributes.
2667 */
2668 if (what == HAT_SET_ATTR || what == HAT_LOAD_ATTR) {
2669 if ((attr & PROT_WRITE) &&
2670 !PTE_GET(oldpte, PT_WRITABLE))
2671 newpte |= PT_WRITABLE;
2672
2673 if ((attr & HAT_NOSYNC) &&
2674 PTE_GET(oldpte, PT_SOFTWARE) < PT_NOSYNC)
2675 newpte |= PT_NOSYNC;
2676
2677 if ((attr & PROT_EXEC) && PTE_GET(oldpte, mmu.pt_nx))
2678 newpte &= ~mmu.pt_nx;
2679 }
2680
2681 if (what == HAT_LOAD_ATTR) {
2682 if (!(attr & PROT_WRITE) &&
2683 PTE_GET(oldpte, PT_WRITABLE))
2684 newpte &= ~PT_WRITABLE;
2685
2686 if (!(attr & HAT_NOSYNC) &&
2687 PTE_GET(oldpte, PT_SOFTWARE) >= PT_NOSYNC)
2688 newpte &= ~PT_SOFTWARE;
2689
2690 if (!(attr & PROT_EXEC) && !PTE_GET(oldpte, mmu.pt_nx))
2691 newpte |= mmu.pt_nx;
2692 }
2693
2694 if (what == HAT_CLR_ATTR) {
2695 if ((attr & PROT_WRITE) && PTE_GET(oldpte, PT_WRITABLE))
2696 newpte &= ~PT_WRITABLE;
2697
2698 if ((attr & HAT_NOSYNC) &&
2699 PTE_GET(oldpte, PT_SOFTWARE) >= PT_NOSYNC)
2700 newpte &= ~PT_SOFTWARE;
2701
2702 if ((attr & PROT_EXEC) && !PTE_GET(oldpte, mmu.pt_nx))
2703 newpte |= mmu.pt_nx;
2704 }
2705
2706 /*
2707 * Ensure NOSYNC/NOCONSIST mappings have REF and MOD set.
2708 * x86pte_set() depends on this.
2709 */
2710 if (PTE_GET(newpte, PT_SOFTWARE) >= PT_NOSYNC)
2711 newpte |= PT_REF | PT_MOD;
2712
2713 /*
2714 * what about PROT_READ or others? this code only handles:
2715 * EXEC, WRITE, NOSYNC
2716 */
2717
2718 /*
2719 * If new PTE really changed, update the table.
2720 */
2721 if (newpte != oldpte) {
2722 entry = htable_va2entry(vaddr, ht);
2723 oldpte = hati_update_pte(ht, entry, oldpte, newpte);
2724 if (oldpte != 0) {
2725 x86_hm_exit(pp);
2726 goto try_again;
2727 }
2728 }
2729 x86_hm_exit(pp);
2730 }
2731 if (ht)
2732 htable_release(ht);
2733 XPV_ALLOW_MIGRATE();
2734 }
2735
2736 /*
2737 * Various wrappers for hat_updateattr()
2738 */
2739 void
2740 hat_setattr(hat_t *hat, caddr_t addr, size_t len, uint_t attr)
2741 {
2742 ASSERT(hat == kas.a_hat || (uintptr_t)addr + len <= _userlimit);
2743 hat_updateattr(hat, addr, len, attr, HAT_SET_ATTR);
2744 }
2745
2746 void
2747 hat_clrattr(hat_t *hat, caddr_t addr, size_t len, uint_t attr)
2748 {
2749 ASSERT(hat == kas.a_hat || (uintptr_t)addr + len <= _userlimit);
2750 hat_updateattr(hat, addr, len, attr, HAT_CLR_ATTR);
2751 }
2752
2753 void
2754 hat_chgattr(hat_t *hat, caddr_t addr, size_t len, uint_t attr)
2755 {
2756 ASSERT(hat == kas.a_hat || (uintptr_t)addr + len <= _userlimit);
2757 hat_updateattr(hat, addr, len, attr, HAT_LOAD_ATTR);
2758 }
2759
2760 void
2761 hat_chgprot(hat_t *hat, caddr_t addr, size_t len, uint_t vprot)
2762 {
2763 ASSERT(hat == kas.a_hat || (uintptr_t)addr + len <= _userlimit);
2764 hat_updateattr(hat, addr, len, vprot & HAT_PROT_MASK, HAT_LOAD_ATTR);
2765 }
2766
2767 /*
2768 * size_t hat_getpagesize(hat, addr)
2769 * returns pagesize in bytes for <hat, addr>. returns -1 of there is
2770 * no mapping. This is an advisory call.
2771 */
2772 ssize_t
2773 hat_getpagesize(hat_t *hat, caddr_t addr)
2774 {
2775 uintptr_t vaddr = ALIGN2PAGE(addr);
2776 htable_t *ht;
2777 size_t pagesize;
2778
2779 ASSERT(hat == kas.a_hat || vaddr <= _userlimit);
2780 if (IN_VA_HOLE(vaddr))
2781 return (-1);
2782 ht = htable_getpage(hat, vaddr, NULL);
2783 if (ht == NULL)
2784 return (-1);
2785 pagesize = LEVEL_SIZE(ht->ht_level);
2786 htable_release(ht);
2787 return (pagesize);
2788 }
2789
2790
2791
2792 /*
2793 * pfn_t hat_getpfnum(hat, addr)
2794 * returns pfn for <hat, addr> or PFN_INVALID if mapping is invalid.
2795 */
2796 pfn_t
2797 hat_getpfnum(hat_t *hat, caddr_t addr)
2798 {
2799 uintptr_t vaddr = ALIGN2PAGE(addr);
2800 htable_t *ht;
2801 uint_t entry;
2802 pfn_t pfn = PFN_INVALID;
2803
2804 ASSERT(hat == kas.a_hat || vaddr <= _userlimit);
2805 if (khat_running == 0)
2806 return (PFN_INVALID);
2807
2808 if (IN_VA_HOLE(vaddr))
2809 return (PFN_INVALID);
2810
2811 XPV_DISALLOW_MIGRATE();
2812 /*
2813 * A very common use of hat_getpfnum() is from the DDI for kernel pages.
2814 * Use the kmap_ptes (which also covers the 32 bit heap) to speed
2815 * this up.
2816 */
2817 if (mmu.kmap_addr <= vaddr && vaddr < mmu.kmap_eaddr) {
2818 x86pte_t pte;
2819 pgcnt_t pg_index;
2820
2821 pg_index = mmu_btop(vaddr - mmu.kmap_addr);
2822 pte = GET_PTE(PT_INDEX_PTR(mmu.kmap_ptes, pg_index));
2823 if (PTE_ISVALID(pte))
2824 /*LINTED [use of constant 0 causes a lint warning] */
2825 pfn = PTE2PFN(pte, 0);
2826 XPV_ALLOW_MIGRATE();
2827 return (pfn);
2828 }
2829
2830 ht = htable_getpage(hat, vaddr, &entry);
2831 if (ht == NULL) {
2832 XPV_ALLOW_MIGRATE();
2833 return (PFN_INVALID);
2834 }
2835 ASSERT(vaddr >= ht->ht_vaddr);
2836 ASSERT(vaddr <= HTABLE_LAST_PAGE(ht));
2837 pfn = PTE2PFN(x86pte_get(ht, entry), ht->ht_level);
2838 if (ht->ht_level > 0)
2839 pfn += mmu_btop(vaddr & LEVEL_OFFSET(ht->ht_level));
2840 htable_release(ht);
2841 XPV_ALLOW_MIGRATE();
2842 return (pfn);
2843 }
2844
2845 /*
2846 * int hat_probe(hat, addr)
2847 * return 0 if no valid mapping is present. Faster version
2848 * of hat_getattr in certain architectures.
2849 */
2850 int
2851 hat_probe(hat_t *hat, caddr_t addr)
2852 {
2853 uintptr_t vaddr = ALIGN2PAGE(addr);
2854 uint_t entry;
2855 htable_t *ht;
2856 pgcnt_t pg_off;
2857
2858 ASSERT(hat == kas.a_hat || vaddr <= _userlimit);
2859 ASSERT(hat == kas.a_hat ||
2860 AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
2861 if (IN_VA_HOLE(vaddr))
2862 return (0);
2863
2864 /*
2865 * Most common use of hat_probe is from segmap. We special case it
2866 * for performance.
2867 */
2868 if (mmu.kmap_addr <= vaddr && vaddr < mmu.kmap_eaddr) {
2869 pg_off = mmu_btop(vaddr - mmu.kmap_addr);
2870 if (mmu.pae_hat)
2871 return (PTE_ISVALID(mmu.kmap_ptes[pg_off]));
2872 else
2873 return (PTE_ISVALID(
2874 ((x86pte32_t *)mmu.kmap_ptes)[pg_off]));
2875 }
2876
2877 ht = htable_getpage(hat, vaddr, &entry);
2878 htable_release(ht);
2879 return (ht != NULL);
2880 }
2881
2882 /*
2883 * Find out if the segment for hat_share()/hat_unshare() is DISM or locked ISM.
2884 */
2885 static int
2886 is_it_dism(hat_t *hat, caddr_t va)
2887 {
2888 struct seg *seg;
2889 struct shm_data *shmd;
2890 struct spt_data *sptd;
2891
2892 seg = as_findseg(hat->hat_as, va, 0);
2893 ASSERT(seg != NULL);
2894 ASSERT(seg->s_base <= va);
2895 shmd = (struct shm_data *)seg->s_data;
2896 ASSERT(shmd != NULL);
2897 sptd = (struct spt_data *)shmd->shm_sptseg->s_data;
2898 ASSERT(sptd != NULL);
2899 if (sptd->spt_flags & SHM_PAGEABLE)
2900 return (1);
2901 return (0);
2902 }
2903
2904 /*
2905 * Simple implementation of ISM. hat_share() is similar to hat_memload_array(),
2906 * except that we use the ism_hat's existing mappings to determine the pages
2907 * and protections to use for this hat. If we find a full properly aligned
2908 * and sized pagetable, we will attempt to share the pagetable itself.
2909 */
2910 /*ARGSUSED*/
2911 int
2912 hat_share(
2913 hat_t *hat,
2914 caddr_t addr,
2915 hat_t *ism_hat,
2916 caddr_t src_addr,
2917 size_t len, /* almost useless value, see below.. */
2918 uint_t ismszc)
2919 {
2920 uintptr_t vaddr_start = (uintptr_t)addr;
2921 uintptr_t vaddr;
2922 uintptr_t eaddr = vaddr_start + len;
2923 uintptr_t ism_addr_start = (uintptr_t)src_addr;
2924 uintptr_t ism_addr = ism_addr_start;
2925 uintptr_t e_ism_addr = ism_addr + len;
2926 htable_t *ism_ht = NULL;
2927 htable_t *ht;
2928 x86pte_t pte;
2929 page_t *pp;
2930 pfn_t pfn;
2931 level_t l;
2932 pgcnt_t pgcnt;
2933 uint_t prot;
2934 int is_dism;
2935 int flags;
2936
2937 /*
2938 * We might be asked to share an empty DISM hat by as_dup()
2939 */
2940 ASSERT(hat != kas.a_hat);
2941 ASSERT(eaddr <= _userlimit);
2942 if (!(ism_hat->hat_flags & HAT_SHARED)) {
2943 ASSERT(hat_get_mapped_size(ism_hat) == 0);
2944 return (0);
2945 }
2946 XPV_DISALLOW_MIGRATE();
2947
2948 /*
2949 * The SPT segment driver often passes us a size larger than there are
2950 * valid mappings. That's because it rounds the segment size up to a
2951 * large pagesize, even if the actual memory mapped by ism_hat is less.
2952 */
2953 ASSERT(IS_PAGEALIGNED(vaddr_start));
2954 ASSERT(IS_PAGEALIGNED(ism_addr_start));
2955 ASSERT(ism_hat->hat_flags & HAT_SHARED);
2956 is_dism = is_it_dism(hat, addr);
2957 while (ism_addr < e_ism_addr) {
2958 /*
2959 * use htable_walk to get the next valid ISM mapping
2960 */
2961 pte = htable_walk(ism_hat, &ism_ht, &ism_addr, e_ism_addr);
2962 if (ism_ht == NULL)
2963 break;
2964
2965 /*
2966 * First check to see if we already share the page table.
2967 */
2968 l = ism_ht->ht_level;
2969 vaddr = vaddr_start + (ism_addr - ism_addr_start);
2970 ht = htable_lookup(hat, vaddr, l);
2971 if (ht != NULL) {
2972 if (ht->ht_flags & HTABLE_SHARED_PFN)
2973 goto shared;
2974 htable_release(ht);
2975 goto not_shared;
2976 }
2977
2978 /*
2979 * Can't ever share top table.
2980 */
2981 if (l == mmu.max_level)
2982 goto not_shared;
2983
2984 /*
2985 * Avoid level mismatches later due to DISM faults.
2986 */
2987 if (is_dism && l > 0)
2988 goto not_shared;
2989
2990 /*
2991 * addresses and lengths must align
2992 * table must be fully populated
2993 * no lower level page tables
2994 */
2995 if (ism_addr != ism_ht->ht_vaddr ||
2996 (vaddr & LEVEL_OFFSET(l + 1)) != 0)
2997 goto not_shared;
2998
2999 /*
3000 * The range of address space must cover a full table.
3001 */
3002 if (e_ism_addr - ism_addr < LEVEL_SIZE(l + 1))
3003 goto not_shared;
3004
3005 /*
3006 * All entries in the ISM page table must be leaf PTEs.
3007 */
3008 if (l > 0) {
3009 int e;
3010
3011 /*
3012 * We know the 0th is from htable_walk() above.
3013 */
3014 for (e = 1; e < HTABLE_NUM_PTES(ism_ht); ++e) {
3015 x86pte_t pte;
3016 pte = x86pte_get(ism_ht, e);
3017 if (!PTE_ISPAGE(pte, l))
3018 goto not_shared;
3019 }
3020 }
3021
3022 /*
3023 * share the page table
3024 */
3025 ht = htable_create(hat, vaddr, l, ism_ht);
3026 shared:
3027 ASSERT(ht->ht_flags & HTABLE_SHARED_PFN);
3028 ASSERT(ht->ht_shares == ism_ht);
3029 hat->hat_ism_pgcnt +=
3030 (ism_ht->ht_valid_cnt - ht->ht_valid_cnt) <<
3031 (LEVEL_SHIFT(ht->ht_level) - MMU_PAGESHIFT);
3032 ht->ht_valid_cnt = ism_ht->ht_valid_cnt;
3033 htable_release(ht);
3034 ism_addr = ism_ht->ht_vaddr + LEVEL_SIZE(l + 1);
3035 htable_release(ism_ht);
3036 ism_ht = NULL;
3037 continue;
3038
3039 not_shared:
3040 /*
3041 * Unable to share the page table. Instead we will
3042 * create new mappings from the values in the ISM mappings.
3043 * Figure out what level size mappings to use;
3044 */
3045 for (l = ism_ht->ht_level; l > 0; --l) {
3046 if (LEVEL_SIZE(l) <= eaddr - vaddr &&
3047 (vaddr & LEVEL_OFFSET(l)) == 0)
3048 break;
3049 }
3050
3051 /*
3052 * The ISM mapping might be larger than the share area,
3053 * be careful to truncate it if needed.
3054 */
3055 if (eaddr - vaddr >= LEVEL_SIZE(ism_ht->ht_level)) {
3056 pgcnt = mmu_btop(LEVEL_SIZE(ism_ht->ht_level));
3057 } else {
3058 pgcnt = mmu_btop(eaddr - vaddr);
3059 l = 0;
3060 }
3061
3062 pfn = PTE2PFN(pte, ism_ht->ht_level);
3063 ASSERT(pfn != PFN_INVALID);
3064 while (pgcnt > 0) {
3065 /*
3066 * Make a new pte for the PFN for this level.
3067 * Copy protections for the pte from the ISM pte.
3068 */
3069 pp = page_numtopp_nolock(pfn);
3070 ASSERT(pp != NULL);
3071
3072 prot = PROT_USER | PROT_READ | HAT_UNORDERED_OK;
3073 if (PTE_GET(pte, PT_WRITABLE))
3074 prot |= PROT_WRITE;
3075 if (!PTE_GET(pte, PT_NX))
3076 prot |= PROT_EXEC;
3077
3078 flags = HAT_LOAD;
3079 if (!is_dism)
3080 flags |= HAT_LOAD_LOCK | HAT_LOAD_NOCONSIST;
3081 while (hati_load_common(hat, vaddr, pp, prot, flags,
3082 l, pfn) != 0) {
3083 if (l == 0)
3084 panic("hati_load_common() failure");
3085 --l;
3086 }
3087
3088 vaddr += LEVEL_SIZE(l);
3089 ism_addr += LEVEL_SIZE(l);
3090 pfn += mmu_btop(LEVEL_SIZE(l));
3091 pgcnt -= mmu_btop(LEVEL_SIZE(l));
3092 }
3093 }
3094 if (ism_ht != NULL)
3095 htable_release(ism_ht);
3096 XPV_ALLOW_MIGRATE();
3097 return (0);
3098 }
3099
3100
3101 /*
3102 * hat_unshare() is similar to hat_unload_callback(), but
3103 * we have to look for empty shared pagetables. Note that
3104 * hat_unshare() is always invoked against an entire segment.
3105 */
3106 /*ARGSUSED*/
3107 void
3108 hat_unshare(hat_t *hat, caddr_t addr, size_t len, uint_t ismszc)
3109 {
3110 uint64_t vaddr = (uintptr_t)addr;
3111 uintptr_t eaddr = vaddr + len;
3112 htable_t *ht = NULL;
3113 uint_t need_demaps = 0;
3114 int flags = HAT_UNLOAD_UNMAP;
3115 level_t l;
3116
3117 ASSERT(hat != kas.a_hat);
3118 ASSERT(eaddr <= _userlimit);
3119 ASSERT(IS_PAGEALIGNED(vaddr));
3120 ASSERT(IS_PAGEALIGNED(eaddr));
3121 XPV_DISALLOW_MIGRATE();
3122
3123 /*
3124 * First go through and remove any shared pagetables.
3125 *
3126 * Note that it's ok to delay the TLB shootdown till the entire range is
3127 * finished, because if hat_pageunload() were to unload a shared
3128 * pagetable page, its hat_tlb_inval() will do a global TLB invalidate.
3129 */
3130 l = mmu.max_page_level;
3131 if (l == mmu.max_level)
3132 --l;
3133 for (; l >= 0; --l) {
3134 for (vaddr = (uintptr_t)addr; vaddr < eaddr;
3135 vaddr = (vaddr & LEVEL_MASK(l + 1)) + LEVEL_SIZE(l + 1)) {
3136 ASSERT(!IN_VA_HOLE(vaddr));
3137 /*
3138 * find a pagetable that maps the current address
3139 */
3140 ht = htable_lookup(hat, vaddr, l);
3141 if (ht == NULL)
3142 continue;
3143 if (ht->ht_flags & HTABLE_SHARED_PFN) {
3144 /*
3145 * clear page count, set valid_cnt to 0,
3146 * let htable_release() finish the job
3147 */
3148 hat->hat_ism_pgcnt -= ht->ht_valid_cnt <<
3149 (LEVEL_SHIFT(ht->ht_level) - MMU_PAGESHIFT);
3150 ht->ht_valid_cnt = 0;
3151 need_demaps = 1;
3152 }
3153 htable_release(ht);
3154 }
3155 }
3156
3157 /*
3158 * flush the TLBs - since we're probably dealing with MANY mappings
3159 * we do just one CR3 reload.
3160 */
3161 if (!(hat->hat_flags & HAT_FREEING) && need_demaps)
3162 hat_tlb_inval(hat, DEMAP_ALL_ADDR);
3163
3164 /*
3165 * Now go back and clean up any unaligned mappings that
3166 * couldn't share pagetables.
3167 */
3168 if (!is_it_dism(hat, addr))
3169 flags |= HAT_UNLOAD_UNLOCK;
3170 hat_unload(hat, addr, len, flags);
3171 XPV_ALLOW_MIGRATE();
3172 }
3173
3174
3175 /*
3176 * hat_reserve() does nothing
3177 */
3178 /*ARGSUSED*/
3179 void
3180 hat_reserve(struct as *as, caddr_t addr, size_t len)
3181 {
3182 }
3183
3184
3185 /*
3186 * Called when all mappings to a page should have write permission removed.
3187 * Mostly stolen from hat_pagesync()
3188 */
3189 static void
3190 hati_page_clrwrt(struct page *pp)
3191 {
3192 hment_t *hm = NULL;
3193 htable_t *ht;
3194 uint_t entry;
3195 x86pte_t old;
3196 x86pte_t new;
3197 uint_t pszc = 0;
3198
3199 XPV_DISALLOW_MIGRATE();
3200 next_size:
3201 /*
3202 * walk thru the mapping list clearing write permission
3203 */
3204 x86_hm_enter(pp);
3205 while ((hm = hment_walk(pp, &ht, &entry, hm)) != NULL) {
3206 if (ht->ht_level < pszc)
3207 continue;
3208 old = x86pte_get(ht, entry);
3209
3210 for (;;) {
3211 /*
3212 * Is this mapping of interest?
3213 */
3214 if (PTE2PFN(old, ht->ht_level) != pp->p_pagenum ||
3215 PTE_GET(old, PT_WRITABLE) == 0)
3216 break;
3217
3218 /*
3219 * Clear ref/mod writable bits. This requires cross
3220 * calls to ensure any executing TLBs see cleared bits.
3221 */
3222 new = old;
3223 PTE_CLR(new, PT_REF | PT_MOD | PT_WRITABLE);
3224 old = hati_update_pte(ht, entry, old, new);
3225 if (old != 0)
3226 continue;
3227
3228 break;
3229 }
3230 }
3231 x86_hm_exit(pp);
3232 while (pszc < pp->p_szc) {
3233 page_t *tpp;
3234 pszc++;
3235 tpp = PP_GROUPLEADER(pp, pszc);
3236 if (pp != tpp) {
3237 pp = tpp;
3238 goto next_size;
3239 }
3240 }
3241 XPV_ALLOW_MIGRATE();
3242 }
3243
3244 /*
3245 * void hat_page_setattr(pp, flag)
3246 * void hat_page_clrattr(pp, flag)
3247 * used to set/clr ref/mod bits.
3248 */
3249 void
3250 hat_page_setattr(struct page *pp, uint_t flag)
3251 {
3252 vnode_t *vp = pp->p_vnode;
3253 kmutex_t *vphm = NULL;
3254 page_t **listp;
3255 int noshuffle;
3256
3257 noshuffle = flag & P_NSH;
3258 flag &= ~P_NSH;
3259
3260 if (PP_GETRM(pp, flag) == flag)
3261 return;
3262
3263 if ((flag & P_MOD) != 0 && vp != NULL && IS_VMODSORT(vp) &&
3264 !noshuffle) {
3265 vphm = page_vnode_mutex(vp);
3266 mutex_enter(vphm);
3267 }
3268
3269 PP_SETRM(pp, flag);
3270
3271 if (vphm != NULL) {
3272
3273 /*
3274 * Some File Systems examine v_pages for NULL w/o
3275 * grabbing the vphm mutex. Must not let it become NULL when
3276 * pp is the only page on the list.
3277 */
3278 if (pp->p_vpnext != pp) {
3279 page_vpsub(&vp->v_pages, pp);
3280 if (vp->v_pages != NULL)
3281 listp = &vp->v_pages->p_vpprev->p_vpnext;
3282 else
3283 listp = &vp->v_pages;
3284 page_vpadd(listp, pp);
3285 }
3286 mutex_exit(vphm);
3287 }
3288 }
3289
3290 void
3291 hat_page_clrattr(struct page *pp, uint_t flag)
3292 {
3293 vnode_t *vp = pp->p_vnode;
3294 ASSERT(!(flag & ~(P_MOD | P_REF | P_RO)));
3295
3296 /*
3297 * Caller is expected to hold page's io lock for VMODSORT to work
3298 * correctly with pvn_vplist_dirty() and pvn_getdirty() when mod
3299 * bit is cleared.
3300 * We don't have assert to avoid tripping some existing third party
3301 * code. The dirty page is moved back to top of the v_page list
3302 * after IO is done in pvn_write_done().
3303 */
3304 PP_CLRRM(pp, flag);
3305
3306 if ((flag & P_MOD) != 0 && vp != NULL && IS_VMODSORT(vp)) {
3307
3308 /*
3309 * VMODSORT works by removing write permissions and getting
3310 * a fault when a page is made dirty. At this point
3311 * we need to remove write permission from all mappings
3312 * to this page.
3313 */
3314 hati_page_clrwrt(pp);
3315 }
3316 }
3317
3318 /*
3319 * If flag is specified, returns 0 if attribute is disabled
3320 * and non zero if enabled. If flag specifes multiple attributes
3321 * then returns 0 if ALL attributes are disabled. This is an advisory
3322 * call.
3323 */
3324 uint_t
3325 hat_page_getattr(struct page *pp, uint_t flag)
3326 {
3327 return (PP_GETRM(pp, flag));
3328 }
3329
3330
3331 /*
3332 * common code used by hat_pageunload() and hment_steal()
3333 */
3334 hment_t *
3335 hati_page_unmap(page_t *pp, htable_t *ht, uint_t entry)
3336 {
3337 x86pte_t old_pte;
3338 pfn_t pfn = pp->p_pagenum;
3339 hment_t *hm;
3340
3341 /*
3342 * We need to acquire a hold on the htable in order to
3343 * do the invalidate. We know the htable must exist, since
3344 * unmap's don't release the htable until after removing any
3345 * hment. Having x86_hm_enter() keeps that from proceeding.
3346 */
3347 htable_acquire(ht);
3348
3349 /*
3350 * Invalidate the PTE and remove the hment.
3351 */
3352 old_pte = x86pte_inval(ht, entry, 0, NULL, B_TRUE);
3353 if (PTE2PFN(old_pte, ht->ht_level) != pfn) {
3354 panic("x86pte_inval() failure found PTE = " FMT_PTE
3355 " pfn being unmapped is %lx ht=0x%lx entry=0x%x",
3356 old_pte, pfn, (uintptr_t)ht, entry);
3357 }
3358
3359 /*
3360 * Clean up all the htable information for this mapping
3361 */
3362 ASSERT(ht->ht_valid_cnt > 0);
3363 HTABLE_DEC(ht->ht_valid_cnt);
3364 PGCNT_DEC(ht->ht_hat, ht->ht_level);
3365
3366 /*
3367 * sync ref/mod bits to the page_t
3368 */
3369 if (PTE_GET(old_pte, PT_SOFTWARE) < PT_NOSYNC)
3370 hati_sync_pte_to_page(pp, old_pte, ht->ht_level);
3371
3372 /*
3373 * Remove the mapping list entry for this page.
3374 */
3375 hm = hment_remove(pp, ht, entry);
3376
3377 /*
3378 * drop the mapping list lock so that we might free the
3379 * hment and htable.
3380 */
3381 x86_hm_exit(pp);
3382 htable_release(ht);
3383 return (hm);
3384 }
3385
3386 extern int vpm_enable;
3387 /*
3388 * Unload all translations to a page. If the page is a subpage of a large
3389 * page, the large page mappings are also removed.
3390 *
3391 * The forceflags are unused.
3392 */
3393
3394 /*ARGSUSED*/
3395 static int
3396 hati_pageunload(struct page *pp, uint_t pg_szcd, uint_t forceflag)
3397 {
3398 page_t *cur_pp = pp;
3399 hment_t *hm;
3400 hment_t *prev;
3401 htable_t *ht;
3402 uint_t entry;
3403 level_t level;
3404
3405 XPV_DISALLOW_MIGRATE();
3406
3407 /*
3408 * prevent recursion due to kmem_free()
3409 */
3410 ++curthread->t_hatdepth;
3411 ASSERT(curthread->t_hatdepth < 16);
3412
3413 #if defined(__amd64)
3414 /*
3415 * clear the vpm ref.
3416 */
3417 if (vpm_enable) {
3418 pp->p_vpmref = 0;
3419 }
3420 #endif
3421 /*
3422 * The loop with next_size handles pages with multiple pagesize mappings
3423 */
3424 next_size:
3425 for (;;) {
3426
3427 /*
3428 * Get a mapping list entry
3429 */
3430 x86_hm_enter(cur_pp);
3431 for (prev = NULL; ; prev = hm) {
3432 hm = hment_walk(cur_pp, &ht, &entry, prev);
3433 if (hm == NULL) {
3434 x86_hm_exit(cur_pp);
3435
3436 /*
3437 * If not part of a larger page, we're done.
3438 */
3439 if (cur_pp->p_szc <= pg_szcd) {
3440 ASSERT(curthread->t_hatdepth > 0);
3441 --curthread->t_hatdepth;
3442 XPV_ALLOW_MIGRATE();
3443 return (0);
3444 }
3445
3446 /*
3447 * Else check the next larger page size.
3448 * hat_page_demote() may decrease p_szc
3449 * but that's ok we'll just take an extra
3450 * trip discover there're no larger mappings
3451 * and return.
3452 */
3453 ++pg_szcd;
3454 cur_pp = PP_GROUPLEADER(cur_pp, pg_szcd);
3455 goto next_size;
3456 }
3457
3458 /*
3459 * If this mapping size matches, remove it.
3460 */
3461 level = ht->ht_level;
3462 if (level == pg_szcd)
3463 break;
3464 }
3465
3466 /*
3467 * Remove the mapping list entry for this page.
3468 * Note this does the x86_hm_exit() for us.
3469 */
3470 hm = hati_page_unmap(cur_pp, ht, entry);
3471 if (hm != NULL)
3472 hment_free(hm);
3473 }
3474 }
3475
3476 int
3477 hat_pageunload(struct page *pp, uint_t forceflag)
3478 {
3479 ASSERT(PAGE_EXCL(pp));
3480 return (hati_pageunload(pp, 0, forceflag));
3481 }
3482
3483 /*
3484 * Unload all large mappings to pp and reduce by 1 p_szc field of every large
3485 * page level that included pp.
3486 *
3487 * pp must be locked EXCL. Even though no other constituent pages are locked
3488 * it's legal to unload large mappings to pp because all constituent pages of
3489 * large locked mappings have to be locked SHARED. therefore if we have EXCL
3490 * lock on one of constituent pages none of the large mappings to pp are
3491 * locked.
3492 *
3493 * Change (always decrease) p_szc field starting from the last constituent
3494 * page and ending with root constituent page so that root's pszc always shows
3495 * the area where hat_page_demote() may be active.
3496 *
3497 * This mechanism is only used for file system pages where it's not always
3498 * possible to get EXCL locks on all constituent pages to demote the size code
3499 * (as is done for anonymous or kernel large pages).
3500 */
3501 void
3502 hat_page_demote(page_t *pp)
3503 {
3504 uint_t pszc;
3505 uint_t rszc;
3506 uint_t szc;
3507 page_t *rootpp;
3508 page_t *firstpp;
3509 page_t *lastpp;
3510 pgcnt_t pgcnt;
3511
3512 ASSERT(PAGE_EXCL(pp));
3513 ASSERT(!PP_ISFREE(pp));
3514 ASSERT(page_szc_lock_assert(pp));
3515
3516 if (pp->p_szc == 0)
3517 return;
3518
3519 rootpp = PP_GROUPLEADER(pp, 1);
3520 (void) hati_pageunload(rootpp, 1, HAT_FORCE_PGUNLOAD);
3521
3522 /*
3523 * all large mappings to pp are gone
3524 * and no new can be setup since pp is locked exclusively.
3525 *
3526 * Lock the root to make sure there's only one hat_page_demote()
3527 * outstanding within the area of this root's pszc.
3528 *
3529 * Second potential hat_page_demote() is already eliminated by upper
3530 * VM layer via page_szc_lock() but we don't rely on it and use our
3531 * own locking (so that upper layer locking can be changed without
3532 * assumptions that hat depends on upper layer VM to prevent multiple
3533 * hat_page_demote() to be issued simultaneously to the same large
3534 * page).
3535 */
3536 again:
3537 pszc = pp->p_szc;
3538 if (pszc == 0)
3539 return;
3540 rootpp = PP_GROUPLEADER(pp, pszc);
3541 x86_hm_enter(rootpp);
3542 /*
3543 * If root's p_szc is different from pszc we raced with another
3544 * hat_page_demote(). Drop the lock and try to find the root again.
3545 * If root's p_szc is greater than pszc previous hat_page_demote() is
3546 * not done yet. Take and release mlist lock of root's root to wait
3547 * for previous hat_page_demote() to complete.
3548 */
3549 if ((rszc = rootpp->p_szc) != pszc) {
3550 x86_hm_exit(rootpp);
3551 if (rszc > pszc) {
3552 /* p_szc of a locked non free page can't increase */
3553 ASSERT(pp != rootpp);
3554
3555 rootpp = PP_GROUPLEADER(rootpp, rszc);
3556 x86_hm_enter(rootpp);
3557 x86_hm_exit(rootpp);
3558 }
3559 goto again;
3560 }
3561 ASSERT(pp->p_szc == pszc);
3562
3563 /*
3564 * Decrement by 1 p_szc of every constituent page of a region that
3565 * covered pp. For example if original szc is 3 it gets changed to 2
3566 * everywhere except in region 2 that covered pp. Region 2 that
3567 * covered pp gets demoted to 1 everywhere except in region 1 that
3568 * covered pp. The region 1 that covered pp is demoted to region
3569 * 0. It's done this way because from region 3 we removed level 3
3570 * mappings, from region 2 that covered pp we removed level 2 mappings
3571 * and from region 1 that covered pp we removed level 1 mappings. All
3572 * changes are done from from high pfn's to low pfn's so that roots
3573 * are changed last allowing one to know the largest region where
3574 * hat_page_demote() is stil active by only looking at the root page.
3575 *
3576 * This algorithm is implemented in 2 while loops. First loop changes
3577 * p_szc of pages to the right of pp's level 1 region and second
3578 * loop changes p_szc of pages of level 1 region that covers pp
3579 * and all pages to the left of level 1 region that covers pp.
3580 * In the first loop p_szc keeps dropping with every iteration
3581 * and in the second loop it keeps increasing with every iteration.
3582 *
3583 * First loop description: Demote pages to the right of pp outside of
3584 * level 1 region that covers pp. In every iteration of the while
3585 * loop below find the last page of szc region and the first page of
3586 * (szc - 1) region that is immediately to the right of (szc - 1)
3587 * region that covers pp. From last such page to first such page
3588 * change every page's szc to szc - 1. Decrement szc and continue
3589 * looping until szc is 1. If pp belongs to the last (szc - 1) region
3590 * of szc region skip to the next iteration.
3591 */
3592 szc = pszc;
3593 while (szc > 1) {
3594 lastpp = PP_GROUPLEADER(pp, szc);
3595 pgcnt = page_get_pagecnt(szc);
3596 lastpp += pgcnt - 1;
3597 firstpp = PP_GROUPLEADER(pp, (szc - 1));
3598 pgcnt = page_get_pagecnt(szc - 1);
3599 if (lastpp - firstpp < pgcnt) {
3600 szc--;
3601 continue;
3602 }
3603 firstpp += pgcnt;
3604 while (lastpp != firstpp) {
3605 ASSERT(lastpp->p_szc == pszc);
3606 lastpp->p_szc = szc - 1;
3607 lastpp--;
3608 }
3609 firstpp->p_szc = szc - 1;
3610 szc--;
3611 }
3612
3613 /*
3614 * Second loop description:
3615 * First iteration changes p_szc to 0 of every
3616 * page of level 1 region that covers pp.
3617 * Subsequent iterations find last page of szc region
3618 * immediately to the left of szc region that covered pp
3619 * and first page of (szc + 1) region that covers pp.
3620 * From last to first page change p_szc of every page to szc.
3621 * Increment szc and continue looping until szc is pszc.
3622 * If pp belongs to the fist szc region of (szc + 1) region
3623 * skip to the next iteration.
3624 *
3625 */
3626 szc = 0;
3627 while (szc < pszc) {
3628 firstpp = PP_GROUPLEADER(pp, (szc + 1));
3629 if (szc == 0) {
3630 pgcnt = page_get_pagecnt(1);
3631 lastpp = firstpp + (pgcnt - 1);
3632 } else {
3633 lastpp = PP_GROUPLEADER(pp, szc);
3634 if (firstpp == lastpp) {
3635 szc++;
3636 continue;
3637 }
3638 lastpp--;
3639 pgcnt = page_get_pagecnt(szc);
3640 }
3641 while (lastpp != firstpp) {
3642 ASSERT(lastpp->p_szc == pszc);
3643 lastpp->p_szc = szc;
3644 lastpp--;
3645 }
3646 firstpp->p_szc = szc;
3647 if (firstpp == rootpp)
3648 break;
3649 szc++;
3650 }
3651 x86_hm_exit(rootpp);
3652 }
3653
3654 /*
3655 * get hw stats from hardware into page struct and reset hw stats
3656 * returns attributes of page
3657 * Flags for hat_pagesync, hat_getstat, hat_sync
3658 *
3659 * define HAT_SYNC_ZERORM 0x01
3660 *
3661 * Additional flags for hat_pagesync
3662 *
3663 * define HAT_SYNC_STOPON_REF 0x02
3664 * define HAT_SYNC_STOPON_MOD 0x04
3665 * define HAT_SYNC_STOPON_RM 0x06
3666 * define HAT_SYNC_STOPON_SHARED 0x08
3667 */
3668 uint_t
3669 hat_pagesync(struct page *pp, uint_t flags)
3670 {
3671 hment_t *hm = NULL;
3672 htable_t *ht;
3673 uint_t entry;
3674 x86pte_t old, save_old;
3675 x86pte_t new;
3676 uchar_t nrmbits = P_REF|P_MOD|P_RO;
3677 extern ulong_t po_share;
3678 page_t *save_pp = pp;
3679 uint_t pszc = 0;
3680
3681 ASSERT(PAGE_LOCKED(pp) || panicstr);
3682
3683 if (PP_ISRO(pp) && (flags & HAT_SYNC_STOPON_MOD))
3684 return (pp->p_nrm & nrmbits);
3685
3686 if ((flags & HAT_SYNC_ZERORM) == 0) {
3687
3688 if ((flags & HAT_SYNC_STOPON_REF) != 0 && PP_ISREF(pp))
3689 return (pp->p_nrm & nrmbits);
3690
3691 if ((flags & HAT_SYNC_STOPON_MOD) != 0 && PP_ISMOD(pp))
3692 return (pp->p_nrm & nrmbits);
3693
3694 if ((flags & HAT_SYNC_STOPON_SHARED) != 0 &&
3695 hat_page_getshare(pp) > po_share) {
3696 if (PP_ISRO(pp))
3697 PP_SETREF(pp);
3698 return (pp->p_nrm & nrmbits);
3699 }
3700 }
3701
3702 XPV_DISALLOW_MIGRATE();
3703 next_size:
3704 /*
3705 * walk thru the mapping list syncing (and clearing) ref/mod bits.
3706 */
3707 x86_hm_enter(pp);
3708 while ((hm = hment_walk(pp, &ht, &entry, hm)) != NULL) {
3709 if (ht->ht_level < pszc)
3710 continue;
3711 old = x86pte_get(ht, entry);
3712 try_again:
3713
3714 ASSERT(PTE2PFN(old, ht->ht_level) == pp->p_pagenum);
3715
3716 if (PTE_GET(old, PT_REF | PT_MOD) == 0)
3717 continue;
3718
3719 save_old = old;
3720 if ((flags & HAT_SYNC_ZERORM) != 0) {
3721
3722 /*
3723 * Need to clear ref or mod bits. Need to demap
3724 * to make sure any executing TLBs see cleared bits.
3725 */
3726 new = old;
3727 PTE_CLR(new, PT_REF | PT_MOD);
3728 old = hati_update_pte(ht, entry, old, new);
3729 if (old != 0)
3730 goto try_again;
3731
3732 old = save_old;
3733 }
3734
3735 /*
3736 * Sync the PTE
3737 */
3738 if (!(flags & HAT_SYNC_ZERORM) &&
3739 PTE_GET(old, PT_SOFTWARE) <= PT_NOSYNC)
3740 hati_sync_pte_to_page(pp, old, ht->ht_level);
3741
3742 /*
3743 * can stop short if we found a ref'd or mod'd page
3744 */
3745 if ((flags & HAT_SYNC_STOPON_MOD) && PP_ISMOD(save_pp) ||
3746 (flags & HAT_SYNC_STOPON_REF) && PP_ISREF(save_pp)) {
3747 x86_hm_exit(pp);
3748 goto done;
3749 }
3750 }
3751 x86_hm_exit(pp);
3752 while (pszc < pp->p_szc) {
3753 page_t *tpp;
3754 pszc++;
3755 tpp = PP_GROUPLEADER(pp, pszc);
3756 if (pp != tpp) {
3757 pp = tpp;
3758 goto next_size;
3759 }
3760 }
3761 done:
3762 XPV_ALLOW_MIGRATE();
3763 return (save_pp->p_nrm & nrmbits);
3764 }
3765
3766 /*
3767 * returns approx number of mappings to this pp. A return of 0 implies
3768 * there are no mappings to the page.
3769 */
3770 ulong_t
3771 hat_page_getshare(page_t *pp)
3772 {
3773 uint_t cnt;
3774 cnt = hment_mapcnt(pp);
3775 #if defined(__amd64)
3776 if (vpm_enable && pp->p_vpmref) {
3777 cnt += 1;
3778 }
3779 #endif
3780 return (cnt);
3781 }
3782
3783 /*
3784 * Return 1 the number of mappings exceeds sh_thresh. Return 0
3785 * otherwise.
3786 */
3787 int
3788 hat_page_checkshare(page_t *pp, ulong_t sh_thresh)
3789 {
3790 return (hat_page_getshare(pp) > sh_thresh);
3791 }
3792
3793 /*
3794 * hat_softlock isn't supported anymore
3795 */
3796 /*ARGSUSED*/
3797 faultcode_t
3798 hat_softlock(
3799 hat_t *hat,
3800 caddr_t addr,
3801 size_t *len,
3802 struct page **page_array,
3803 uint_t flags)
3804 {
3805 return (FC_NOSUPPORT);
3806 }
3807
3808
3809
3810 /*
3811 * Routine to expose supported HAT features to platform independent code.
3812 */
3813 /*ARGSUSED*/
3814 int
3815 hat_supported(enum hat_features feature, void *arg)
3816 {
3817 switch (feature) {
3818
3819 case HAT_SHARED_PT: /* this is really ISM */
3820 return (1);
3821
3822 case HAT_DYNAMIC_ISM_UNMAP:
3823 return (0);
3824
3825 case HAT_VMODSORT:
3826 return (1);
3827
3828 case HAT_SHARED_REGIONS:
3829 return (0);
3830
3831 default:
3832 panic("hat_supported() - unknown feature");
3833 }
3834 return (0);
3835 }
3836
3837 /*
3838 * Called when a thread is exiting and has been switched to the kernel AS
3839 */
3840 void
3841 hat_thread_exit(kthread_t *thd)
3842 {
3843 ASSERT(thd->t_procp->p_as == &kas);
3844 XPV_DISALLOW_MIGRATE();
3845 hat_switch(thd->t_procp->p_as->a_hat);
3846 XPV_ALLOW_MIGRATE();
3847 }
3848
3849 /*
3850 * Setup the given brand new hat structure as the new HAT on this cpu's mmu.
3851 */
3852 /*ARGSUSED*/
3853 void
3854 hat_setup(hat_t *hat, int flags)
3855 {
3856 XPV_DISALLOW_MIGRATE();
3857 kpreempt_disable();
3858
3859 hat_switch(hat);
3860
3861 kpreempt_enable();
3862 XPV_ALLOW_MIGRATE();
3863 }
3864
3865 /*
3866 * Prepare for a CPU private mapping for the given address.
3867 *
3868 * The address can only be used from a single CPU and can be remapped
3869 * using hat_mempte_remap(). Return the address of the PTE.
3870 *
3871 * We do the htable_create() if necessary and increment the valid count so
3872 * the htable can't disappear. We also hat_devload() the page table into
3873 * kernel so that the PTE is quickly accessed.
3874 */
3875 hat_mempte_t
3876 hat_mempte_setup(caddr_t addr)
3877 {
3878 uintptr_t va = (uintptr_t)addr;
3879 htable_t *ht;
3880 uint_t entry;
3881 x86pte_t oldpte;
3882 hat_mempte_t p;
3883
3884 ASSERT(IS_PAGEALIGNED(va));
3885 ASSERT(!IN_VA_HOLE(va));
3886 ++curthread->t_hatdepth;
3887 XPV_DISALLOW_MIGRATE();
3888 ht = htable_getpte(kas.a_hat, va, &entry, &oldpte, 0);
3889 if (ht == NULL) {
3890 ht = htable_create(kas.a_hat, va, 0, NULL);
3891 entry = htable_va2entry(va, ht);
3892 ASSERT(ht->ht_level == 0);
3893 oldpte = x86pte_get(ht, entry);
3894 }
3895 if (PTE_ISVALID(oldpte))
3896 panic("hat_mempte_setup(): address already mapped"
3897 "ht=%p, entry=%d, pte=" FMT_PTE, (void *)ht, entry, oldpte);
3898
3899 /*
3900 * increment ht_valid_cnt so that the pagetable can't disappear
3901 */
3902 HTABLE_INC(ht->ht_valid_cnt);
3903
3904 /*
3905 * return the PTE physical address to the caller.
3906 */
3907 htable_release(ht);
3908 XPV_ALLOW_MIGRATE();
3909 p = PT_INDEX_PHYSADDR(pfn_to_pa(ht->ht_pfn), entry);
3910 --curthread->t_hatdepth;
3911 return (p);
3912 }
3913
3914 /*
3915 * Release a CPU private mapping for the given address.
3916 * We decrement the htable valid count so it might be destroyed.
3917 */
3918 /*ARGSUSED1*/
3919 void
3920 hat_mempte_release(caddr_t addr, hat_mempte_t pte_pa)
3921 {
3922 htable_t *ht;
3923
3924 XPV_DISALLOW_MIGRATE();
3925 /*
3926 * invalidate any left over mapping and decrement the htable valid count
3927 */
3928 #ifdef __xpv
3929 if (HYPERVISOR_update_va_mapping((uintptr_t)addr, 0,
3930 UVMF_INVLPG | UVMF_LOCAL))
3931 panic("HYPERVISOR_update_va_mapping() failed");
3932 #else
3933 {
3934 x86pte_t *pteptr;
3935
3936 pteptr = x86pte_mapin(mmu_btop(pte_pa),
3937 (pte_pa & MMU_PAGEOFFSET) >> mmu.pte_size_shift, NULL);
3938 if (mmu.pae_hat)
3939 *pteptr = 0;
3940 else
3941 *(x86pte32_t *)pteptr = 0;
3942 mmu_tlbflush_entry(addr);
3943 x86pte_mapout();
3944 }
3945 #endif
3946
3947 ht = htable_getpte(kas.a_hat, ALIGN2PAGE(addr), NULL, NULL, 0);
3948 if (ht == NULL)
3949 panic("hat_mempte_release(): invalid address");
3950 ASSERT(ht->ht_level == 0);
3951 HTABLE_DEC(ht->ht_valid_cnt);
3952 htable_release(ht);
3953 XPV_ALLOW_MIGRATE();
3954 }
3955
3956 /*
3957 * Apply a temporary CPU private mapping to a page. We flush the TLB only
3958 * on this CPU, so this ought to have been called with preemption disabled.
3959 */
3960 void
3961 hat_mempte_remap(
3962 pfn_t pfn,
3963 caddr_t addr,
3964 hat_mempte_t pte_pa,
3965 uint_t attr,
3966 uint_t flags)
3967 {
3968 uintptr_t va = (uintptr_t)addr;
3969 x86pte_t pte;
3970
3971 /*
3972 * Remap the given PTE to the new page's PFN. Invalidate only
3973 * on this CPU.
3974 */
3975 #ifdef DEBUG
3976 htable_t *ht;
3977 uint_t entry;
3978
3979 ASSERT(IS_PAGEALIGNED(va));
3980 ASSERT(!IN_VA_HOLE(va));
3981 ht = htable_getpte(kas.a_hat, va, &entry, NULL, 0);
3982 ASSERT(ht != NULL);
3983 ASSERT(ht->ht_level == 0);
3984 ASSERT(ht->ht_valid_cnt > 0);
3985 ASSERT(ht->ht_pfn == mmu_btop(pte_pa));
3986 htable_release(ht);
3987 #endif
3988 XPV_DISALLOW_MIGRATE();
3989 pte = hati_mkpte(pfn, attr, 0, flags);
3990 #ifdef __xpv
3991 if (HYPERVISOR_update_va_mapping(va, pte, UVMF_INVLPG | UVMF_LOCAL))
3992 panic("HYPERVISOR_update_va_mapping() failed");
3993 #else
3994 {
3995 x86pte_t *pteptr;
3996
3997 pteptr = x86pte_mapin(mmu_btop(pte_pa),
3998 (pte_pa & MMU_PAGEOFFSET) >> mmu.pte_size_shift, NULL);
3999 if (mmu.pae_hat)
4000 *(x86pte_t *)pteptr = pte;
4001 else
4002 *(x86pte32_t *)pteptr = (x86pte32_t)pte;
4003 mmu_tlbflush_entry(addr);
4004 x86pte_mapout();
4005 }
4006 #endif
4007 XPV_ALLOW_MIGRATE();
4008 }
4009
4010
4011
4012 /*
4013 * Hat locking functions
4014 * XXX - these two functions are currently being used by hatstats
4015 * they can be removed by using a per-as mutex for hatstats.
4016 */
4017 void
4018 hat_enter(hat_t *hat)
4019 {
4020 mutex_enter(&hat->hat_mutex);
4021 }
4022
4023 void
4024 hat_exit(hat_t *hat)
4025 {
4026 mutex_exit(&hat->hat_mutex);
4027 }
4028
4029 /*
4030 * HAT part of cpu initialization.
4031 */
4032 void
4033 hat_cpu_online(struct cpu *cpup)
4034 {
4035 if (cpup != CPU) {
4036 x86pte_cpu_init(cpup);
4037 hat_vlp_setup(cpup);
4038 }
4039 CPUSET_ATOMIC_ADD(khat_cpuset, cpup->cpu_id);
4040 }
4041
4042 /*
4043 * HAT part of cpu deletion.
4044 * (currently, we only call this after the cpu is safely passivated.)
4045 */
4046 void
4047 hat_cpu_offline(struct cpu *cpup)
4048 {
4049 ASSERT(cpup != CPU);
4050
4051 CPUSET_ATOMIC_DEL(khat_cpuset, cpup->cpu_id);
4052 hat_vlp_teardown(cpup);
4053 x86pte_cpu_fini(cpup);
4054 }
4055
4056 /*
4057 * Function called after all CPUs are brought online.
4058 * Used to remove low address boot mappings.
4059 */
4060 void
4061 clear_boot_mappings(uintptr_t low, uintptr_t high)
4062 {
4063 uintptr_t vaddr = low;
4064 htable_t *ht = NULL;
4065 level_t level;
4066 uint_t entry;
4067 x86pte_t pte;
4068
4069 /*
4070 * On 1st CPU we can unload the prom mappings, basically we blow away
4071 * all virtual mappings under _userlimit.
4072 */
4073 while (vaddr < high) {
4074 pte = htable_walk(kas.a_hat, &ht, &vaddr, high);
4075 if (ht == NULL)
4076 break;
4077
4078 level = ht->ht_level;
4079 entry = htable_va2entry(vaddr, ht);
4080 ASSERT(level <= mmu.max_page_level);
4081 ASSERT(PTE_ISPAGE(pte, level));
4082
4083 /*
4084 * Unload the mapping from the page tables.
4085 */
4086 (void) x86pte_inval(ht, entry, 0, NULL, B_TRUE);
4087 ASSERT(ht->ht_valid_cnt > 0);
4088 HTABLE_DEC(ht->ht_valid_cnt);
4089 PGCNT_DEC(ht->ht_hat, ht->ht_level);
4090
4091 vaddr += LEVEL_SIZE(ht->ht_level);
4092 }
4093 if (ht)
4094 htable_release(ht);
4095 }
4096
4097 /*
4098 * Atomically update a new translation for a single page. If the
4099 * currently installed PTE doesn't match the value we expect to find,
4100 * it's not updated and we return the PTE we found.
4101 *
4102 * If activating nosync or NOWRITE and the page was modified we need to sync
4103 * with the page_t. Also sync with page_t if clearing ref/mod bits.
4104 */
4105 static x86pte_t
4106 hati_update_pte(htable_t *ht, uint_t entry, x86pte_t expected, x86pte_t new)
4107 {
4108 page_t *pp;
4109 uint_t rm = 0;
4110 x86pte_t replaced;
4111
4112 if (PTE_GET(expected, PT_SOFTWARE) < PT_NOSYNC &&
4113 PTE_GET(expected, PT_MOD | PT_REF) &&
4114 (PTE_GET(new, PT_NOSYNC) || !PTE_GET(new, PT_WRITABLE) ||
4115 !PTE_GET(new, PT_MOD | PT_REF))) {
4116
4117 ASSERT(!pfn_is_foreign(PTE2PFN(expected, ht->ht_level)));
4118 pp = page_numtopp_nolock(PTE2PFN(expected, ht->ht_level));
4119 ASSERT(pp != NULL);
4120 if (PTE_GET(expected, PT_MOD))
4121 rm |= P_MOD;
4122 if (PTE_GET(expected, PT_REF))
4123 rm |= P_REF;
4124 PTE_CLR(new, PT_MOD | PT_REF);
4125 }
4126
4127 replaced = x86pte_update(ht, entry, expected, new);
4128 if (replaced != expected)
4129 return (replaced);
4130
4131 if (rm) {
4132 /*
4133 * sync to all constituent pages of a large page
4134 */
4135 pgcnt_t pgcnt = page_get_pagecnt(ht->ht_level);
4136 ASSERT(IS_P2ALIGNED(pp->p_pagenum, pgcnt));
4137 while (pgcnt-- > 0) {
4138 /*
4139 * hat_page_demote() can't decrease
4140 * pszc below this mapping size
4141 * since large mapping existed after we
4142 * took mlist lock.
4143 */
4144 ASSERT(pp->p_szc >= ht->ht_level);
4145 hat_page_setattr(pp, rm);
4146 ++pp;
4147 }
4148 }
4149
4150 return (0);
4151 }
4152
4153 /* ARGSUSED */
4154 void
4155 hat_join_srd(struct hat *hat, vnode_t *evp)
4156 {
4157 }
4158
4159 /* ARGSUSED */
4160 hat_region_cookie_t
4161 hat_join_region(struct hat *hat,
4162 caddr_t r_saddr,
4163 size_t r_size,
4164 void *r_obj,
4165 u_offset_t r_objoff,
4166 uchar_t r_perm,
4167 uchar_t r_pgszc,
4168 hat_rgn_cb_func_t r_cb_function,
4169 uint_t flags)
4170 {
4171 panic("No shared region support on x86");
4172 return (HAT_INVALID_REGION_COOKIE);
4173 }
4174
4175 /* ARGSUSED */
4176 void
4177 hat_leave_region(struct hat *hat, hat_region_cookie_t rcookie, uint_t flags)
4178 {
4179 panic("No shared region support on x86");
4180 }
4181
4182 /* ARGSUSED */
4183 void
4184 hat_dup_region(struct hat *hat, hat_region_cookie_t rcookie)
4185 {
4186 panic("No shared region support on x86");
4187 }
4188
4189
4190 /*
4191 * Kernel Physical Mapping (kpm) facility
4192 *
4193 * Most of the routines needed to support segkpm are almost no-ops on the
4194 * x86 platform. We map in the entire segment when it is created and leave
4195 * it mapped in, so there is no additional work required to set up and tear
4196 * down individual mappings. All of these routines were created to support
4197 * SPARC platforms that have to avoid aliasing in their virtually indexed
4198 * caches.
4199 *
4200 * Most of the routines have sanity checks in them (e.g. verifying that the
4201 * passed-in page is locked). We don't actually care about most of these
4202 * checks on x86, but we leave them in place to identify problems in the
4203 * upper levels.
4204 */
4205
4206 /*
4207 * Map in a locked page and return the vaddr.
4208 */
4209 /*ARGSUSED*/
4210 caddr_t
4211 hat_kpm_mapin(struct page *pp, struct kpme *kpme)
4212 {
4213 caddr_t vaddr;
4214
4215 #ifdef DEBUG
4216 if (kpm_enable == 0) {
4217 cmn_err(CE_WARN, "hat_kpm_mapin: kpm_enable not set\n");
4218 return ((caddr_t)NULL);
4219 }
4220
4221 if (pp == NULL || PAGE_LOCKED(pp) == 0) {
4222 cmn_err(CE_WARN, "hat_kpm_mapin: pp zero or not locked\n");
4223 return ((caddr_t)NULL);
4224 }
4225 #endif
4226
4227 vaddr = hat_kpm_page2va(pp, 1);
4228
4229 return (vaddr);
4230 }
4231
4232 /*
4233 * Mapout a locked page.
4234 */
4235 /*ARGSUSED*/
4236 void
4237 hat_kpm_mapout(struct page *pp, struct kpme *kpme, caddr_t vaddr)
4238 {
4239 #ifdef DEBUG
4240 if (kpm_enable == 0) {
4241 cmn_err(CE_WARN, "hat_kpm_mapout: kpm_enable not set\n");
4242 return;
4243 }
4244
4245 if (IS_KPM_ADDR(vaddr) == 0) {
4246 cmn_err(CE_WARN, "hat_kpm_mapout: no kpm address\n");
4247 return;
4248 }
4249
4250 if (pp == NULL || PAGE_LOCKED(pp) == 0) {
4251 cmn_err(CE_WARN, "hat_kpm_mapout: page zero or not locked\n");
4252 return;
4253 }
4254 #endif
4255 }
4256
4257 /*
4258 * hat_kpm_mapin_pfn is used to obtain a kpm mapping for physical
4259 * memory addresses that are not described by a page_t. It can
4260 * also be used for normal pages that are not locked, but beware
4261 * this is dangerous - no locking is performed, so the identity of
4262 * the page could change. hat_kpm_mapin_pfn is not supported when
4263 * vac_colors > 1, because the chosen va depends on the page identity,
4264 * which could change.
4265 * The caller must only pass pfn's for valid physical addresses; violation
4266 * of this rule will cause panic.
4267 */
4268 caddr_t
4269 hat_kpm_mapin_pfn(pfn_t pfn)
4270 {
4271 caddr_t paddr, vaddr;
4272
4273 if (kpm_enable == 0)
4274 return ((caddr_t)NULL);
4275
4276 paddr = (caddr_t)ptob(pfn);
4277 vaddr = (uintptr_t)kpm_vbase + paddr;
4278
4279 return ((caddr_t)vaddr);
4280 }
4281
4282 /*ARGSUSED*/
4283 void
4284 hat_kpm_mapout_pfn(pfn_t pfn)
4285 {
4286 /* empty */
4287 }
4288
4289 /*
4290 * Return the kpm virtual address for a specific pfn
4291 */
4292 caddr_t
4293 hat_kpm_pfn2va(pfn_t pfn)
4294 {
4295 uintptr_t vaddr = (uintptr_t)kpm_vbase + mmu_ptob(pfn);
4296
4297 ASSERT(!pfn_is_foreign(pfn));
4298 return ((caddr_t)vaddr);
4299 }
4300
4301 /*
4302 * Return the kpm virtual address for the page at pp.
4303 */
4304 /*ARGSUSED*/
4305 caddr_t
4306 hat_kpm_page2va(struct page *pp, int checkswap)
4307 {
4308 return (hat_kpm_pfn2va(pp->p_pagenum));
4309 }
4310
4311 /*
4312 * Return the page frame number for the kpm virtual address vaddr.
4313 */
4314 pfn_t
4315 hat_kpm_va2pfn(caddr_t vaddr)
4316 {
4317 pfn_t pfn;
4318
4319 ASSERT(IS_KPM_ADDR(vaddr));
4320
4321 pfn = (pfn_t)btop(vaddr - kpm_vbase);
4322
4323 return (pfn);
4324 }
4325
4326
4327 /*
4328 * Return the page for the kpm virtual address vaddr.
4329 */
4330 page_t *
4331 hat_kpm_vaddr2page(caddr_t vaddr)
4332 {
4333 pfn_t pfn;
4334
4335 ASSERT(IS_KPM_ADDR(vaddr));
4336
4337 pfn = hat_kpm_va2pfn(vaddr);
4338
4339 return (page_numtopp_nolock(pfn));
4340 }
4341
4342 /*
4343 * hat_kpm_fault is called from segkpm_fault when we take a page fault on a
4344 * KPM page. This should never happen on x86
4345 */
4346 int
4347 hat_kpm_fault(hat_t *hat, caddr_t vaddr)
4348 {
4349 panic("pagefault in seg_kpm. hat: 0x%p vaddr: 0x%p",
4350 (void *)hat, (void *)vaddr);
4351
4352 return (0);
4353 }
4354
4355 /*ARGSUSED*/
4356 void
4357 hat_kpm_mseghash_clear(int nentries)
4358 {}
4359
4360 /*ARGSUSED*/
4361 void
4362 hat_kpm_mseghash_update(pgcnt_t inx, struct memseg *msp)
4363 {}
4364
4365 #ifndef __xpv
4366 void
4367 hat_kpm_addmem_mseg_update(struct memseg *msp, pgcnt_t nkpmpgs,
4368 offset_t kpm_pages_off)
4369 {
4370 _NOTE(ARGUNUSED(nkpmpgs, kpm_pages_off));
4371 pfn_t base, end;
4372
4373 /*
4374 * kphysm_add_memory_dynamic() does not set nkpmpgs
4375 * when page_t memory is externally allocated. That
4376 * code must properly calculate nkpmpgs in all cases
4377 * if nkpmpgs needs to be used at some point.
4378 */
4379
4380 /*
4381 * The meta (page_t) pages for dynamically added memory are allocated
4382 * either from the incoming memory itself or from existing memory.
4383 * In the former case the base of the incoming pages will be different
4384 * than the base of the dynamic segment so call memseg_get_start() to
4385 * get the actual base of the incoming memory for each case.
4386 */
4387
4388 base = memseg_get_start(msp);
4389 end = msp->pages_end;
4390
4391 hat_devload(kas.a_hat, kpm_vbase + mmu_ptob(base),
4392 mmu_ptob(end - base), base, PROT_READ | PROT_WRITE,
4393 HAT_LOAD | HAT_LOAD_LOCK | HAT_LOAD_NOCONSIST);
4394 }
4395
4396 void
4397 hat_kpm_addmem_mseg_insert(struct memseg *msp)
4398 {
4399 _NOTE(ARGUNUSED(msp));
4400 }
4401
4402 void
4403 hat_kpm_addmem_memsegs_update(struct memseg *msp)
4404 {
4405 _NOTE(ARGUNUSED(msp));
4406 }
4407
4408 /*
4409 * Return end of metadata for an already setup memseg.
4410 * X86 platforms don't need per-page meta data to support kpm.
4411 */
4412 caddr_t
4413 hat_kpm_mseg_reuse(struct memseg *msp)
4414 {
4415 return ((caddr_t)msp->epages);
4416 }
4417
4418 void
4419 hat_kpm_delmem_mseg_update(struct memseg *msp, struct memseg **mspp)
4420 {
4421 _NOTE(ARGUNUSED(msp, mspp));
4422 ASSERT(0);
4423 }
4424
4425 void
4426 hat_kpm_split_mseg_update(struct memseg *msp, struct memseg **mspp,
4427 struct memseg *lo, struct memseg *mid, struct memseg *hi)
4428 {
4429 _NOTE(ARGUNUSED(msp, mspp, lo, mid, hi));
4430 ASSERT(0);
4431 }
4432
4433 /*
4434 * Walk the memsegs chain, applying func to each memseg span.
4435 */
4436 void
4437 hat_kpm_walk(void (*func)(void *, void *, size_t), void *arg)
4438 {
4439 pfn_t pbase, pend;
4440 void *base;
4441 size_t size;
4442 struct memseg *msp;
4443
4444 for (msp = memsegs; msp; msp = msp->next) {
4445 pbase = msp->pages_base;
4446 pend = msp->pages_end;
4447 base = ptob(pbase) + kpm_vbase;
4448 size = ptob(pend - pbase);
4449 func(arg, base, size);
4450 }
4451 }
4452
4453 #else /* __xpv */
4454
4455 /*
4456 * There are specific Hypervisor calls to establish and remove mappings
4457 * to grant table references and the privcmd driver. We have to ensure
4458 * that a page table actually exists.
4459 */
4460 void
4461 hat_prepare_mapping(hat_t *hat, caddr_t addr, uint64_t *pte_ma)
4462 {
4463 maddr_t base_ma;
4464 htable_t *ht;
4465 uint_t entry;
4466
4467 ASSERT(IS_P2ALIGNED((uintptr_t)addr, MMU_PAGESIZE));
4468 XPV_DISALLOW_MIGRATE();
4469 ht = htable_create(hat, (uintptr_t)addr, 0, NULL);
4470
4471 /*
4472 * if an address for pte_ma is passed in, return the MA of the pte
4473 * for this specific address. This address is only valid as long
4474 * as the htable stays locked.
4475 */
4476 if (pte_ma != NULL) {
4477 entry = htable_va2entry((uintptr_t)addr, ht);
4478 base_ma = pa_to_ma(ptob(ht->ht_pfn));
4479 *pte_ma = base_ma + (entry << mmu.pte_size_shift);
4480 }
4481 XPV_ALLOW_MIGRATE();
4482 }
4483
4484 void
4485 hat_release_mapping(hat_t *hat, caddr_t addr)
4486 {
4487 htable_t *ht;
4488
4489 ASSERT(IS_P2ALIGNED((uintptr_t)addr, MMU_PAGESIZE));
4490 XPV_DISALLOW_MIGRATE();
4491 ht = htable_lookup(hat, (uintptr_t)addr, 0);
4492 ASSERT(ht != NULL);
4493 ASSERT(ht->ht_busy >= 2);
4494 htable_release(ht);
4495 htable_release(ht);
4496 XPV_ALLOW_MIGRATE();
4497 }
4498 #endif /* __xpv */