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Merge branch 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / arch / s390 / mm / pgtable.c
CommitLineData
ac41aaee 1// SPDX-License-Identifier: GPL-2.0
3610cce8 2/*
a53c8fab 3 * Copyright IBM Corp. 2007, 2011
3610cce8
MS		 4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
5 */
6
7#include <linux/sched.h>
8#include <linux/kernel.h>
9#include <linux/errno.h>
5a0e3ad6 10#include <linux/gfp.h>
3610cce8
MS		 11#include <linux/mm.h>
12#include <linux/swap.h>
13#include <linux/smp.h>
3610cce8 14#include <linux/spinlock.h>
80217147 15#include <linux/rcupdate.h>
e5992f2e 16#include <linux/slab.h>
b31288fa 17#include <linux/swapops.h>
0b46e0a3 18#include <linux/sysctl.h>
3ac8e380
DD		 19#include <linux/ksm.h>
20#include <linux/mman.h>
3610cce8 21
3610cce8
MS		 22#include <asm/pgtable.h>
23#include <asm/pgalloc.h>
24#include <asm/tlb.h>
25#include <asm/tlbflush.h>
6252d702 26#include <asm/mmu_context.h>
2d42f947 27#include <asm/page-states.h>
3610cce8 28
118bd31b 29static inline void ptep_ipte_local(struct mm_struct *mm, unsigned long addr,
cd774b90 30 pte_t *ptep, int nodat)
118bd31b
MS		 31{
32 unsigned long opt, asce;
33
34 if (MACHINE_HAS_TLB_GUEST) {
35 opt = 0;
36 asce = READ_ONCE(mm->context.gmap_asce);
cd774b90 37 if (asce == 0UL || nodat)
118bd31b 38 opt |= IPTE_NODAT;
28c807e5
MS		 39 if (asce != -1UL) {
40 asce = asce ? : mm->context.asce;
41 opt |= IPTE_GUEST_ASCE;
42 }
43 __ptep_ipte(addr, ptep, opt, asce, IPTE_LOCAL);
118bd31b 44 } else {
28c807e5 45 __ptep_ipte(addr, ptep, 0, 0, IPTE_LOCAL);
118bd31b
MS		 46 }
47}
48
49static inline void ptep_ipte_global(struct mm_struct *mm, unsigned long addr,
cd774b90 50 pte_t *ptep, int nodat)
118bd31b
MS		 51{
52 unsigned long opt, asce;
53
54 if (MACHINE_HAS_TLB_GUEST) {
55 opt = 0;
56 asce = READ_ONCE(mm->context.gmap_asce);
cd774b90 57 if (asce == 0UL || nodat)
118bd31b 58 opt |= IPTE_NODAT;
28c807e5
MS		 59 if (asce != -1UL) {
60 asce = asce ? : mm->context.asce;
61 opt |= IPTE_GUEST_ASCE;
62 }
63 __ptep_ipte(addr, ptep, opt, asce, IPTE_GLOBAL);
118bd31b 64 } else {
28c807e5 65 __ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL);
118bd31b
MS		 66 }
67}
68
ebde765c 69static inline pte_t ptep_flush_direct(struct mm_struct *mm,
cd774b90
MS		 70 unsigned long addr, pte_t *ptep,
71 int nodat)
ebde765c 72{
ebde765c
MS		 73 pte_t old;
74
75 old = *ptep;
76 if (unlikely(pte_val(old) & _PAGE_INVALID))
77 return old;
64f31d58
MS		 78 atomic_inc(&mm->context.flush_count);
79 if (MACHINE_HAS_TLB_LC &&
ebde765c 80 cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
cd774b90 81 ptep_ipte_local(mm, addr, ptep, nodat);
ebde765c 82 else
cd774b90 83 ptep_ipte_global(mm, addr, ptep, nodat);
64f31d58 84 atomic_dec(&mm->context.flush_count);
ebde765c
MS		 85 return old;
86}
87
88static inline pte_t ptep_flush_lazy(struct mm_struct *mm,
cd774b90
MS		 89 unsigned long addr, pte_t *ptep,
90 int nodat)
ebde765c 91{
ebde765c
MS		 92 pte_t old;
93
94 old = *ptep;
95 if (unlikely(pte_val(old) & _PAGE_INVALID))
96 return old;
64f31d58
MS		 97 atomic_inc(&mm->context.flush_count);
98 if (cpumask_equal(&mm->context.cpu_attach_mask,
99 cpumask_of(smp_processor_id()))) {
ebde765c
MS		 100 pte_val(*ptep) |= _PAGE_INVALID;
101 mm->context.flush_mm = 1;
102 } else
cd774b90 103 ptep_ipte_global(mm, addr, ptep, nodat);
64f31d58 104 atomic_dec(&mm->context.flush_count);
ebde765c
MS		 105 return old;
106}
107
1e133ab2
MS		 108static inline pgste_t pgste_get_lock(pte_t *ptep)
109{
110 unsigned long new = 0;
111#ifdef CONFIG_PGSTE
112 unsigned long old;
113
1e133ab2
MS		 114 asm(
115 " lg %0,%2\n"
116 "0: lgr %1,%0\n"
117 " nihh %0,0xff7f\n" /* clear PCL bit in old */
118 " oihh %1,0x0080\n" /* set PCL bit in new */
119 " csg %0,%1,%2\n"
120 " jl 0b\n"
121 : "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
122 : "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
123#endif
124 return __pgste(new);
125}
126
127static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
128{
129#ifdef CONFIG_PGSTE
130 asm(
131 " nihh %1,0xff7f\n" /* clear PCL bit */
132 " stg %1,%0\n"
133 : "=Q" (ptep[PTRS_PER_PTE])
134 : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
135 : "cc", "memory");
1e133ab2
MS		 136#endif
137}
138
139static inline pgste_t pgste_get(pte_t *ptep)
140{
141 unsigned long pgste = 0;
142#ifdef CONFIG_PGSTE
143 pgste = *(unsigned long *)(ptep + PTRS_PER_PTE);
144#endif
145 return __pgste(pgste);
146}
147
148static inline void pgste_set(pte_t *ptep, pgste_t pgste)
149{
150#ifdef CONFIG_PGSTE
151 *(pgste_t *)(ptep + PTRS_PER_PTE) = pgste;
152#endif
153}
154
ebde765c
MS		 155static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste,
156 struct mm_struct *mm)
157{
158#ifdef CONFIG_PGSTE
159 unsigned long address, bits, skey;
160
55531b74 161 if (!mm_uses_skeys(mm) || pte_val(pte) & _PAGE_INVALID)
ebde765c
MS		 162 return pgste;
163 address = pte_val(pte) & PAGE_MASK;
164 skey = (unsigned long) page_get_storage_key(address);
165 bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
166 /* Transfer page changed & referenced bit to guest bits in pgste */
167 pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
168 /* Copy page access key and fetch protection bit to pgste */
169 pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
170 pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
171#endif
172 return pgste;
173
174}
175
176static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
177 struct mm_struct *mm)
178{
179#ifdef CONFIG_PGSTE
180 unsigned long address;
181 unsigned long nkey;
182
55531b74 183 if (!mm_uses_skeys(mm) || pte_val(entry) & _PAGE_INVALID)
ebde765c
MS		 184 return;
185 VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
186 address = pte_val(entry) & PAGE_MASK;
187 /*
188 * Set page access key and fetch protection bit from pgste.
189 * The guest C/R information is still in the PGSTE, set real
190 * key C/R to 0.
191 */
192 nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
193 nkey |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
194 page_set_storage_key(address, nkey, 0);
195#endif
196}
197
198static inline pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
199{
200#ifdef CONFIG_PGSTE
201 if ((pte_val(entry) & _PAGE_PRESENT) &&
202 (pte_val(entry) & _PAGE_WRITE) &&
203 !(pte_val(entry) & _PAGE_INVALID)) {
204 if (!MACHINE_HAS_ESOP) {
205 /*
206 * Without enhanced suppression-on-protection force
207 * the dirty bit on for all writable ptes.
208 */
209 pte_val(entry) |= _PAGE_DIRTY;
210 pte_val(entry) &= ~_PAGE_PROTECT;
211 }
212 if (!(pte_val(entry) & _PAGE_PROTECT))
213 /* This pte allows write access, set user-dirty */
214 pgste_val(pgste) |= PGSTE_UC_BIT;
215 }
216#endif
217 *ptep = entry;
218 return pgste;
219}
220
b2d73b2a
MS		 221static inline pgste_t pgste_pte_notify(struct mm_struct *mm,
222 unsigned long addr,
223 pte_t *ptep, pgste_t pgste)
ebde765c
MS		 224{
225#ifdef CONFIG_PGSTE
4be130a0
MS		 226 unsigned long bits;
227
228 bits = pgste_val(pgste) & (PGSTE_IN_BIT | PGSTE_VSIE_BIT);
229 if (bits) {
230 pgste_val(pgste) ^= bits;
231 ptep_notify(mm, addr, ptep, bits);
ebde765c
MS		 232 }
233#endif
234 return pgste;
235}
236
ebde765c
MS		 237static inline pgste_t ptep_xchg_start(struct mm_struct *mm,
238 unsigned long addr, pte_t *ptep)
239{
240 pgste_t pgste = __pgste(0);
241
242 if (mm_has_pgste(mm)) {
243 pgste = pgste_get_lock(ptep);
b2d73b2a 244 pgste = pgste_pte_notify(mm, addr, ptep, pgste);
ebde765c
MS		 245 }
246 return pgste;
247}
248
0d6da872 249static inline pte_t ptep_xchg_commit(struct mm_struct *mm,
ebde765c
MS		 250 unsigned long addr, pte_t *ptep,
251 pgste_t pgste, pte_t old, pte_t new)
252{
253 if (mm_has_pgste(mm)) {
254 if (pte_val(old) & _PAGE_INVALID)
255 pgste_set_key(ptep, pgste, new, mm);
256 if (pte_val(new) & _PAGE_INVALID) {
257 pgste = pgste_update_all(old, pgste, mm);
258 if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) ==
259 _PGSTE_GPS_USAGE_UNUSED)
260 pte_val(old) |= _PAGE_UNUSED;
261 }
262 pgste = pgste_set_pte(ptep, pgste, new);
263 pgste_set_unlock(ptep, pgste);
264 } else {
265 *ptep = new;
266 }
0d6da872 267 return old;
ebde765c
MS		 268}
269
270pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
271 pte_t *ptep, pte_t new)
272{
273 pgste_t pgste;
274 pte_t old;
cd774b90 275 int nodat;
ebde765c 276
a9809407 277 preempt_disable();
ebde765c 278 pgste = ptep_xchg_start(mm, addr, ptep);
cd774b90
MS		 279 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
280 old = ptep_flush_direct(mm, addr, ptep, nodat);
0d6da872 281 old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
a9809407 282 preempt_enable();
ebde765c
MS		 283 return old;
284}
285EXPORT_SYMBOL(ptep_xchg_direct);
286
287pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr,
288 pte_t *ptep, pte_t new)
289{
290 pgste_t pgste;
291 pte_t old;
cd774b90 292 int nodat;
ebde765c 293
a9809407 294 preempt_disable();
ebde765c 295 pgste = ptep_xchg_start(mm, addr, ptep);
cd774b90
MS		 296 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
297 old = ptep_flush_lazy(mm, addr, ptep, nodat);
0d6da872 298 old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
a9809407 299 preempt_enable();
ebde765c
MS		 300 return old;
301}
302EXPORT_SYMBOL(ptep_xchg_lazy);
303
0cbe3e26 304pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr,
ebde765c
MS		 305 pte_t *ptep)
306{
307 pgste_t pgste;
308 pte_t old;
cd774b90 309 int nodat;
0cbe3e26 310 struct mm_struct *mm = vma->vm_mm;
ebde765c 311
a9809407 312 preempt_disable();
ebde765c 313 pgste = ptep_xchg_start(mm, addr, ptep);
cd774b90
MS		 314 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
315 old = ptep_flush_lazy(mm, addr, ptep, nodat);
ebde765c
MS		 316 if (mm_has_pgste(mm)) {
317 pgste = pgste_update_all(old, pgste, mm);
318 pgste_set(ptep, pgste);
319 }
320 return old;
321}
ebde765c 322
0cbe3e26 323void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
04a86453 324 pte_t *ptep, pte_t old_pte, pte_t pte)
ebde765c
MS		 325{
326 pgste_t pgste;
0cbe3e26 327 struct mm_struct *mm = vma->vm_mm;
ebde765c 328
57d7f939
MS		 329 if (!MACHINE_HAS_NX)
330 pte_val(pte) &= ~_PAGE_NOEXEC;
ebde765c
MS		 331 if (mm_has_pgste(mm)) {
332 pgste = pgste_get(ptep);
333 pgste_set_key(ptep, pgste, pte, mm);
334 pgste = pgste_set_pte(ptep, pgste, pte);
335 pgste_set_unlock(ptep, pgste);
336 } else {
337 *ptep = pte;
338 }
a9809407 339 preempt_enable();
ebde765c 340}
ebde765c 341
118bd31b
MS		 342static inline void pmdp_idte_local(struct mm_struct *mm,
343 unsigned long addr, pmd_t *pmdp)
344{
345 if (MACHINE_HAS_TLB_GUEST)
28c807e5
MS		 346 __pmdp_idte(addr, pmdp, IDTE_NODAT | IDTE_GUEST_ASCE,
347 mm->context.asce, IDTE_LOCAL);
118bd31b 348 else
28c807e5 349 __pmdp_idte(addr, pmdp, 0, 0, IDTE_LOCAL);
a9e00d83 350 if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
6a376277 351 gmap_pmdp_idte_local(mm, addr);
118bd31b
MS		 352}
353
354static inline void pmdp_idte_global(struct mm_struct *mm,
355 unsigned long addr, pmd_t *pmdp)
356{
6a376277 357 if (MACHINE_HAS_TLB_GUEST) {
28c807e5
MS		 358 __pmdp_idte(addr, pmdp, IDTE_NODAT | IDTE_GUEST_ASCE,
359 mm->context.asce, IDTE_GLOBAL);
a9e00d83 360 if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
6a376277
JF		 361 gmap_pmdp_idte_global(mm, addr);
362 } else if (MACHINE_HAS_IDTE) {
28c807e5 363 __pmdp_idte(addr, pmdp, 0, 0, IDTE_GLOBAL);
a9e00d83 364 if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
6a376277
JF		 365 gmap_pmdp_idte_global(mm, addr);
366 } else {
118bd31b 367 __pmdp_csp(pmdp);
a9e00d83 368 if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
6a376277
JF		 369 gmap_pmdp_csp(mm, addr);
370 }
118bd31b
MS		 371}
372
227be799
MS		 373static inline pmd_t pmdp_flush_direct(struct mm_struct *mm,
374 unsigned long addr, pmd_t *pmdp)
375{
227be799
MS		 376 pmd_t old;
377
378 old = *pmdp;
379 if (pmd_val(old) & _SEGMENT_ENTRY_INVALID)
380 return old;
64f31d58
MS		 381 atomic_inc(&mm->context.flush_count);
382 if (MACHINE_HAS_TLB_LC &&
227be799 383 cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
118bd31b 384 pmdp_idte_local(mm, addr, pmdp);
227be799 385 else
118bd31b 386 pmdp_idte_global(mm, addr, pmdp);
64f31d58 387 atomic_dec(&mm->context.flush_count);
227be799
MS		 388 return old;
389}
390
391static inline pmd_t pmdp_flush_lazy(struct mm_struct *mm,
392 unsigned long addr, pmd_t *pmdp)
393{
227be799
MS		 394 pmd_t old;
395
396 old = *pmdp;
397 if (pmd_val(old) & _SEGMENT_ENTRY_INVALID)
398 return old;
64f31d58
MS		 399 atomic_inc(&mm->context.flush_count);
400 if (cpumask_equal(&mm->context.cpu_attach_mask,
401 cpumask_of(smp_processor_id()))) {
227be799
MS		 402 pmd_val(*pmdp) |= _SEGMENT_ENTRY_INVALID;
403 mm->context.flush_mm = 1;
6a376277
JF		 404 if (mm_has_pgste(mm))
405 gmap_pmdp_invalidate(mm, addr);
118bd31b
MS		 406 } else {
407 pmdp_idte_global(mm, addr, pmdp);
408 }
64f31d58 409 atomic_dec(&mm->context.flush_count);
227be799
MS		 410 return old;
411}
412
81a8f2be 413#ifdef CONFIG_PGSTE
637ff9ef
JF		 414static pmd_t *pmd_alloc_map(struct mm_struct *mm, unsigned long addr)
415{
416 pgd_t *pgd;
417 p4d_t *p4d;
418 pud_t *pud;
419 pmd_t *pmd;
420
421 pgd = pgd_offset(mm, addr);
422 p4d = p4d_alloc(mm, pgd, addr);
423 if (!p4d)
424 return NULL;
425 pud = pud_alloc(mm, p4d, addr);
426 if (!pud)
427 return NULL;
428 pmd = pmd_alloc(mm, pud, addr);
429 return pmd;
430}
81a8f2be 431#endif
637ff9ef 432
227be799
MS		 433pmd_t pmdp_xchg_direct(struct mm_struct *mm, unsigned long addr,
434 pmd_t *pmdp, pmd_t new)
435{
436 pmd_t old;
437
a9809407 438 preempt_disable();
227be799
MS		 439 old = pmdp_flush_direct(mm, addr, pmdp);
440 *pmdp = new;
a9809407 441 preempt_enable();
227be799
MS		 442 return old;
443}
444EXPORT_SYMBOL(pmdp_xchg_direct);
445
446pmd_t pmdp_xchg_lazy(struct mm_struct *mm, unsigned long addr,
447 pmd_t *pmdp, pmd_t new)
448{
449 pmd_t old;
450
a9809407 451 preempt_disable();
227be799
MS		 452 old = pmdp_flush_lazy(mm, addr, pmdp);
453 *pmdp = new;
a9809407 454 preempt_enable();
227be799
MS		 455 return old;
456}
457EXPORT_SYMBOL(pmdp_xchg_lazy);
458
118bd31b
MS		 459static inline void pudp_idte_local(struct mm_struct *mm,
460 unsigned long addr, pud_t *pudp)
d08de8e2 461{
118bd31b 462 if (MACHINE_HAS_TLB_GUEST)
28c807e5
MS		 463 __pudp_idte(addr, pudp, IDTE_NODAT | IDTE_GUEST_ASCE,
464 mm->context.asce, IDTE_LOCAL);
118bd31b 465 else
28c807e5 466 __pudp_idte(addr, pudp, 0, 0, IDTE_LOCAL);
118bd31b 467}
d08de8e2 468
118bd31b
MS		 469static inline void pudp_idte_global(struct mm_struct *mm,
470 unsigned long addr, pud_t *pudp)
471{
472 if (MACHINE_HAS_TLB_GUEST)
28c807e5
MS		 473 __pudp_idte(addr, pudp, IDTE_NODAT | IDTE_GUEST_ASCE,
474 mm->context.asce, IDTE_GLOBAL);
118bd31b 475 else if (MACHINE_HAS_IDTE)
28c807e5 476 __pudp_idte(addr, pudp, 0, 0, IDTE_GLOBAL);
118bd31b 477 else
d08de8e2
GS		 478 /*
479 * Invalid bit position is the same for pmd and pud, so we can
480 * re-use _pmd_csp() here
481 */
482 __pmdp_csp((pmd_t *) pudp);
118bd31b
MS		 483}
484
485static inline pud_t pudp_flush_direct(struct mm_struct *mm,
486 unsigned long addr, pud_t *pudp)
487{
488 pud_t old;
489
490 old = *pudp;
491 if (pud_val(old) & _REGION_ENTRY_INVALID)
d08de8e2 492 return old;
d08de8e2
GS		 493 atomic_inc(&mm->context.flush_count);
494 if (MACHINE_HAS_TLB_LC &&
495 cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
118bd31b 496 pudp_idte_local(mm, addr, pudp);
d08de8e2 497 else
118bd31b 498 pudp_idte_global(mm, addr, pudp);
d08de8e2
GS		 499 atomic_dec(&mm->context.flush_count);
500 return old;
501}
502
503pud_t pudp_xchg_direct(struct mm_struct *mm, unsigned long addr,
504 pud_t *pudp, pud_t new)
505{
506 pud_t old;
507
508 preempt_disable();
509 old = pudp_flush_direct(mm, addr, pudp);
510 *pudp = new;
511 preempt_enable();
512 return old;
513}
514EXPORT_SYMBOL(pudp_xchg_direct);
515
75077afb 516#ifdef CONFIG_TRANSPARENT_HUGEPAGE
6b0b50b0
AK		 517void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
518 pgtable_t pgtable)
9501d09f
GS		 519{
520 struct list_head *lh = (struct list_head *) pgtable;
521
ec66ad66 522 assert_spin_locked(pmd_lockptr(mm, pmdp));
9501d09f
GS		 523
524 /* FIFO */
c389a250 525 if (!pmd_huge_pte(mm, pmdp))
9501d09f
GS		 526 INIT_LIST_HEAD(lh);
527 else
c389a250
KS		 528 list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp));
529 pmd_huge_pte(mm, pmdp) = pgtable;
9501d09f
GS		 530}
531
6b0b50b0 532pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
9501d09f
GS		 533{
534 struct list_head *lh;
535 pgtable_t pgtable;
536 pte_t *ptep;
537
ec66ad66 538 assert_spin_locked(pmd_lockptr(mm, pmdp));
9501d09f
GS		 539
540 /* FIFO */
c389a250 541 pgtable = pmd_huge_pte(mm, pmdp);
9501d09f
GS		 542 lh = (struct list_head *) pgtable;
543 if (list_empty(lh))
c389a250 544 pmd_huge_pte(mm, pmdp) = NULL;
9501d09f 545 else {
c389a250 546 pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
9501d09f
GS		 547 list_del(lh);
548 }
549 ptep = (pte_t *) pgtable;
e5098611 550 pte_val(*ptep) = _PAGE_INVALID;
9501d09f 551 ptep++;
e5098611 552 pte_val(*ptep) = _PAGE_INVALID;
9501d09f
GS		 553 return pgtable;
554}
75077afb 555#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1e133ab2
MS		 556
557#ifdef CONFIG_PGSTE
558void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr,
559 pte_t *ptep, pte_t entry)
560{
561 pgste_t pgste;
562
563 /* the mm_has_pgste() check is done in set_pte_at() */
a9809407 564 preempt_disable();
1e133ab2
MS		 565 pgste = pgste_get_lock(ptep);
566 pgste_val(pgste) &= ~_PGSTE_GPS_ZERO;
567 pgste_set_key(ptep, pgste, entry, mm);
568 pgste = pgste_set_pte(ptep, pgste, entry);
569 pgste_set_unlock(ptep, pgste);
a9809407 570 preempt_enable();
1e133ab2
MS		 571}
572
573void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
574{
575 pgste_t pgste;
576
a9809407 577 preempt_disable();
1e133ab2
MS		 578 pgste = pgste_get_lock(ptep);
579 pgste_val(pgste) |= PGSTE_IN_BIT;
580 pgste_set_unlock(ptep, pgste);
a9809407 581 preempt_enable();
1e133ab2
MS		 582}
583
b2d73b2a
MS		 584/**
585 * ptep_force_prot - change access rights of a locked pte
586 * @mm: pointer to the process mm_struct
587 * @addr: virtual address in the guest address space
588 * @ptep: pointer to the page table entry
589 * @prot: indicates guest access rights: PROT_NONE, PROT_READ or PROT_WRITE
4be130a0 590 * @bit: pgste bit to set (e.g. for notification)
b2d73b2a
MS		 591 *
592 * Returns 0 if the access rights were changed and -EAGAIN if the current
593 * and requested access rights are incompatible.
594 */
595int ptep_force_prot(struct mm_struct *mm, unsigned long addr,
4be130a0 596 pte_t *ptep, int prot, unsigned long bit)
b2d73b2a
MS		 597{
598 pte_t entry;
599 pgste_t pgste;
cd774b90 600 int pte_i, pte_p, nodat;
b2d73b2a
MS		 601
602 pgste = pgste_get_lock(ptep);
603 entry = *ptep;
604 /* Check pte entry after all locks have been acquired */
605 pte_i = pte_val(entry) & _PAGE_INVALID;
606 pte_p = pte_val(entry) & _PAGE_PROTECT;
607 if ((pte_i && (prot != PROT_NONE)) ||
608 (pte_p && (prot & PROT_WRITE))) {
609 pgste_set_unlock(ptep, pgste);
610 return -EAGAIN;
611 }
4be130a0 612 /* Change access rights and set pgste bit */
cd774b90 613 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
b2d73b2a 614 if (prot == PROT_NONE && !pte_i) {
cd774b90 615 ptep_flush_direct(mm, addr, ptep, nodat);
b2d73b2a
MS		 616 pgste = pgste_update_all(entry, pgste, mm);
617 pte_val(entry) |= _PAGE_INVALID;
618 }
619 if (prot == PROT_READ && !pte_p) {
cd774b90 620 ptep_flush_direct(mm, addr, ptep, nodat);
b2d73b2a
MS		 621 pte_val(entry) &= ~_PAGE_INVALID;
622 pte_val(entry) |= _PAGE_PROTECT;
623 }
4be130a0 624 pgste_val(pgste) |= bit;
b2d73b2a
MS		 625 pgste = pgste_set_pte(ptep, pgste, entry);
626 pgste_set_unlock(ptep, pgste);
627 return 0;
628}
629
4be130a0 630int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr,
a9d23e71 631 pte_t *sptep, pte_t *tptep, pte_t pte)
4be130a0
MS		 632{
633 pgste_t spgste, tpgste;
634 pte_t spte, tpte;
635 int rc = -EAGAIN;
636
a9d23e71
DH		 637 if (!(pte_val(*tptep) & _PAGE_INVALID))
638 return 0; /* already shadowed */
4be130a0
MS		 639 spgste = pgste_get_lock(sptep);
640 spte = *sptep;
641 if (!(pte_val(spte) & _PAGE_INVALID) &&
a9d23e71
DH		 642 !((pte_val(spte) & _PAGE_PROTECT) &&
643 !(pte_val(pte) & _PAGE_PROTECT))) {
4be130a0
MS		 644 pgste_val(spgste) |= PGSTE_VSIE_BIT;
645 tpgste = pgste_get_lock(tptep);
646 pte_val(tpte) = (pte_val(spte) & PAGE_MASK) |
a9d23e71 647 (pte_val(pte) & _PAGE_PROTECT);
4be130a0
MS		 648 /* don't touch the storage key - it belongs to parent pgste */
649 tpgste = pgste_set_pte(tptep, tpgste, tpte);
650 pgste_set_unlock(tptep, tpgste);
a9d23e71 651 rc = 1;
4be130a0
MS		 652 }
653 pgste_set_unlock(sptep, spgste);
654 return rc;
655}
656
657void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep)
658{
659 pgste_t pgste;
cd774b90 660 int nodat;
4be130a0
MS		 661
662 pgste = pgste_get_lock(ptep);
663 /* notifier is called by the caller */
cd774b90
MS		 664 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
665 ptep_flush_direct(mm, saddr, ptep, nodat);
4be130a0
MS		 666 /* don't touch the storage key - it belongs to parent pgste */
667 pgste = pgste_set_pte(ptep, pgste, __pte(_PAGE_INVALID));
668 pgste_set_unlock(ptep, pgste);
669}
670
1e133ab2
MS		 671static void ptep_zap_swap_entry(struct mm_struct *mm, swp_entry_t entry)
672{
673 if (!non_swap_entry(entry))
674 dec_mm_counter(mm, MM_SWAPENTS);
675 else if (is_migration_entry(entry)) {
676 struct page *page = migration_entry_to_page(entry);
677
678 dec_mm_counter(mm, mm_counter(page));
679 }
680 free_swap_and_cache(entry);
681}
682
683void ptep_zap_unused(struct mm_struct *mm, unsigned long addr,
684 pte_t *ptep, int reset)
685{
686 unsigned long pgstev;
687 pgste_t pgste;
688 pte_t pte;
689
690 /* Zap unused and logically-zero pages */
a9809407 691 preempt_disable();
1e133ab2
MS		 692 pgste = pgste_get_lock(ptep);
693 pgstev = pgste_val(pgste);
694 pte = *ptep;
1c343f7b 695 if (!reset && pte_swap(pte) &&
1e133ab2
MS		 696 ((pgstev & _PGSTE_GPS_USAGE_MASK) == _PGSTE_GPS_USAGE_UNUSED ||
697 (pgstev & _PGSTE_GPS_ZERO))) {
698 ptep_zap_swap_entry(mm, pte_to_swp_entry(pte));
699 pte_clear(mm, addr, ptep);
700 }
701 if (reset)
702 pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;
703 pgste_set_unlock(ptep, pgste);
a9809407 704 preempt_enable();
1e133ab2
MS		 705}
706
707void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
708{
709 unsigned long ptev;
710 pgste_t pgste;
711
97ca7bfc 712 /* Clear storage key ACC and F, but set R/C */
a9809407 713 preempt_disable();
1e133ab2 714 pgste = pgste_get_lock(ptep);
97ca7bfc
CB		 715 pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
716 pgste_val(pgste) |= PGSTE_GR_BIT | PGSTE_GC_BIT;
1e133ab2
MS		 717 ptev = pte_val(*ptep);
718 if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE))
719 page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1);
720 pgste_set_unlock(ptep, pgste);
a9809407 721 preempt_enable();
1e133ab2
MS		 722}
723
724/*
725 * Test and reset if a guest page is dirty
726 */
0959e168
JF		 727bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long addr,
728 pte_t *ptep)
1e133ab2 729{
1e133ab2 730 pgste_t pgste;
1e133ab2
MS		 731 pte_t pte;
732 bool dirty;
cd774b90 733 int nodat;
1e133ab2 734
1e133ab2
MS		 735 pgste = pgste_get_lock(ptep);
736 dirty = !!(pgste_val(pgste) & PGSTE_UC_BIT);
737 pgste_val(pgste) &= ~PGSTE_UC_BIT;
738 pte = *ptep;
739 if (dirty && (pte_val(pte) & _PAGE_PRESENT)) {
b2d73b2a 740 pgste = pgste_pte_notify(mm, addr, ptep, pgste);
cd774b90
MS		 741 nodat = !!(pgste_val(pgste) & _PGSTE_GPS_NODAT);
742 ptep_ipte_global(mm, addr, ptep, nodat);
1e133ab2
MS		 743 if (MACHINE_HAS_ESOP || !(pte_val(pte) & _PAGE_WRITE))
744 pte_val(pte) |= _PAGE_PROTECT;
745 else
746 pte_val(pte) |= _PAGE_INVALID;
747 *ptep = pte;
748 }
749 pgste_set_unlock(ptep, pgste);
1e133ab2
MS		 750 return dirty;
751}
0959e168 752EXPORT_SYMBOL_GPL(ptep_test_and_clear_uc);
1e133ab2
MS		 753
754int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
755 unsigned char key, bool nq)
756{
637ff9ef 757 unsigned long keyul, paddr;
1e133ab2
MS		 758 spinlock_t *ptl;
759 pgste_t old, new;
637ff9ef 760 pmd_t *pmdp;
1e133ab2
MS		 761 pte_t *ptep;
762
637ff9ef
JF		 763 pmdp = pmd_alloc_map(mm, addr);
764 if (unlikely(!pmdp))
765 return -EFAULT;
766
767 ptl = pmd_lock(mm, pmdp);
768 if (!pmd_present(*pmdp)) {
769 spin_unlock(ptl);
770 return -EFAULT;
771 }
772
773 if (pmd_large(*pmdp)) {
774 paddr = pmd_val(*pmdp) & HPAGE_MASK;
775 paddr |= addr & ~HPAGE_MASK;
776 /*
777 * Huge pmds need quiescing operations, they are
778 * always mapped.
779 */
780 page_set_storage_key(paddr, key, 1);
781 spin_unlock(ptl);
782 return 0;
783 }
784 spin_unlock(ptl);
785
786 ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl);
d3ed1cee 787 if (unlikely(!ptep))
1e133ab2 788 return -EFAULT;
1e133ab2
MS		 789
790 new = old = pgste_get_lock(ptep);
791 pgste_val(new) &= ~(PGSTE_GR_BIT | PGSTE_GC_BIT |
792 PGSTE_ACC_BITS | PGSTE_FP_BIT);
793 keyul = (unsigned long) key;
794 pgste_val(new) |= (keyul & (_PAGE_CHANGED | _PAGE_REFERENCED)) << 48;
795 pgste_val(new) |= (keyul & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
796 if (!(pte_val(*ptep) & _PAGE_INVALID)) {
637ff9ef 797 unsigned long bits, skey;
1e133ab2 798
637ff9ef
JF		 799 paddr = pte_val(*ptep) & PAGE_MASK;
800 skey = (unsigned long) page_get_storage_key(paddr);
1e133ab2
MS		 801 bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
802 skey = key & (_PAGE_ACC_BITS | _PAGE_FP_BIT);
803 /* Set storage key ACC and FP */
637ff9ef 804 page_set_storage_key(paddr, skey, !nq);
1e133ab2
MS		 805 /* Merge host changed & referenced into pgste */
806 pgste_val(new) |= bits << 52;
807 }
808 /* changing the guest storage key is considered a change of the page */
809 if ((pgste_val(new) ^ pgste_val(old)) &
810 (PGSTE_ACC_BITS | PGSTE_FP_BIT | PGSTE_GR_BIT | PGSTE_GC_BIT))
811 pgste_val(new) |= PGSTE_UC_BIT;
812
813 pgste_set_unlock(ptep, new);
814 pte_unmap_unlock(ptep, ptl);
1e133ab2
MS		 815 return 0;
816}
817EXPORT_SYMBOL(set_guest_storage_key);
818
1824c723
DH		 819/**
820 * Conditionally set a guest storage key (handling csske).
821 * oldkey will be updated when either mr or mc is set and a pointer is given.
822 *
823 * Returns 0 if a guests storage key update wasn't necessary, 1 if the guest
824 * storage key was updated and -EFAULT on access errors.
825 */
826int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
827 unsigned char key, unsigned char *oldkey,
828 bool nq, bool mr, bool mc)
829{
830 unsigned char tmp, mask = _PAGE_ACC_BITS | _PAGE_FP_BIT;
831 int rc;
832
833 /* we can drop the pgste lock between getting and setting the key */
834 if (mr | mc) {
835 rc = get_guest_storage_key(current->mm, addr, &tmp);
836 if (rc)
837 return rc;
838 if (oldkey)
839 *oldkey = tmp;
840 if (!mr)
841 mask |= _PAGE_REFERENCED;
842 if (!mc)
843 mask |= _PAGE_CHANGED;
844 if (!((tmp ^ key) & mask))
845 return 0;
846 }
847 rc = set_guest_storage_key(current->mm, addr, key, nq);
848 return rc < 0 ? rc : 1;
849}
850EXPORT_SYMBOL(cond_set_guest_storage_key);
851
a7e19ab5
DH		 852/**
853 * Reset a guest reference bit (rrbe), returning the reference and changed bit.
854 *
855 * Returns < 0 in case of error, otherwise the cc to be reported to the guest.
856 */
857int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr)
1e133ab2 858{
1e133ab2 859 spinlock_t *ptl;
637ff9ef 860 unsigned long paddr;
a7e19ab5 861 pgste_t old, new;
637ff9ef 862 pmd_t *pmdp;
1e133ab2 863 pte_t *ptep;
a7e19ab5 864 int cc = 0;
1e133ab2 865
637ff9ef
JF		 866 pmdp = pmd_alloc_map(mm, addr);
867 if (unlikely(!pmdp))
868 return -EFAULT;
869
870 ptl = pmd_lock(mm, pmdp);
871 if (!pmd_present(*pmdp)) {
872 spin_unlock(ptl);
873 return -EFAULT;
874 }
875
876 if (pmd_large(*pmdp)) {
877 paddr = pmd_val(*pmdp) & HPAGE_MASK;
878 paddr |= addr & ~HPAGE_MASK;
879 cc = page_reset_referenced(paddr);
880 spin_unlock(ptl);
881 return cc;
882 }
883 spin_unlock(ptl);
884
885 ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl);
a7e19ab5 886 if (unlikely(!ptep))
1e133ab2 887 return -EFAULT;
1e133ab2 888
a7e19ab5
DH		 889 new = old = pgste_get_lock(ptep);
890 /* Reset guest reference bit only */
891 pgste_val(new) &= ~PGSTE_GR_BIT;
1e133ab2 892
a7e19ab5 893 if (!(pte_val(*ptep) & _PAGE_INVALID)) {
637ff9ef
JF		 894 paddr = pte_val(*ptep) & PAGE_MASK;
895 cc = page_reset_referenced(paddr);
a7e19ab5
DH		 896 /* Merge real referenced bit into host-set */
897 pgste_val(new) |= ((unsigned long) cc << 53) & PGSTE_HR_BIT;
1e133ab2 898 }
a7e19ab5
DH		 899 /* Reflect guest's logical view, not physical */
900 cc |= (pgste_val(old) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 49;
901 /* Changing the guest storage key is considered a change of the page */
902 if ((pgste_val(new) ^ pgste_val(old)) & PGSTE_GR_BIT)
903 pgste_val(new) |= PGSTE_UC_BIT;
904
905 pgste_set_unlock(ptep, new);
906 pte_unmap_unlock(ptep, ptl);
4bead2a4 907 return cc;
a7e19ab5
DH		 908}
909EXPORT_SYMBOL(reset_guest_reference_bit);
910
154c8c19
DH		 911int get_guest_storage_key(struct mm_struct *mm, unsigned long addr,
912 unsigned char *key)
1e133ab2 913{
637ff9ef 914 unsigned long paddr;
1e133ab2
MS		 915 spinlock_t *ptl;
916 pgste_t pgste;
637ff9ef 917 pmd_t *pmdp;
1e133ab2 918 pte_t *ptep;
1e133ab2 919
637ff9ef
JF		 920 pmdp = pmd_alloc_map(mm, addr);
921 if (unlikely(!pmdp))
922 return -EFAULT;
923
924 ptl = pmd_lock(mm, pmdp);
925 if (!pmd_present(*pmdp)) {
926 /* Not yet mapped memory has a zero key */
927 spin_unlock(ptl);
928 *key = 0;
929 return 0;
930 }
931
932 if (pmd_large(*pmdp)) {
933 paddr = pmd_val(*pmdp) & HPAGE_MASK;
934 paddr |= addr & ~HPAGE_MASK;
935 *key = page_get_storage_key(paddr);
936 spin_unlock(ptl);
937 return 0;
938 }
939 spin_unlock(ptl);
940
941 ptep = pte_alloc_map_lock(mm, pmdp, addr, &ptl);
d3ed1cee 942 if (unlikely(!ptep))
1e133ab2 943 return -EFAULT;
1e133ab2 944
d3ed1cee 945 pgste = pgste_get_lock(ptep);
154c8c19 946 *key = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
637ff9ef 947 paddr = pte_val(*ptep) & PAGE_MASK;
8d6037a7 948 if (!(pte_val(*ptep) & _PAGE_INVALID))
637ff9ef 949 *key = page_get_storage_key(paddr);
8d6037a7 950 /* Reflect guest's logical view, not physical */
154c8c19 951 *key |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
1e133ab2
MS		 952 pgste_set_unlock(ptep, pgste);
953 pte_unmap_unlock(ptep, ptl);
154c8c19 954 return 0;
1e133ab2
MS		 955}
956EXPORT_SYMBOL(get_guest_storage_key);
2d42f947
CI		 957
958/**
959 * pgste_perform_essa - perform ESSA actions on the PGSTE.
960 * @mm: the memory context. It must have PGSTEs, no check is performed here!
961 * @hva: the host virtual address of the page whose PGSTE is to be processed
962 * @orc: the specific action to perform, see the ESSA_SET_* macros.
963 * @oldpte: the PTE will be saved there if the pointer is not NULL.
964 * @oldpgste: the old PGSTE will be saved there if the pointer is not NULL.
965 *
966 * Return: 1 if the page is to be added to the CBRL, otherwise 0,
967 * or < 0 in case of error. -EINVAL is returned for invalid values
968 * of orc, -EFAULT for invalid addresses.
969 */
970int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc,
971 unsigned long *oldpte, unsigned long *oldpgste)
972{
973 unsigned long pgstev;
974 spinlock_t *ptl;
975 pgste_t pgste;
976 pte_t *ptep;
977 int res = 0;
978
979 WARN_ON_ONCE(orc > ESSA_MAX);
980 if (unlikely(orc > ESSA_MAX))
981 return -EINVAL;
982 ptep = get_locked_pte(mm, hva, &ptl);
983 if (unlikely(!ptep))
984 return -EFAULT;
985 pgste = pgste_get_lock(ptep);
986 pgstev = pgste_val(pgste);
987 if (oldpte)
988 *oldpte = pte_val(*ptep);
989 if (oldpgste)
990 *oldpgste = pgstev;
991
992 switch (orc) {
993 case ESSA_GET_STATE:
994 break;
995 case ESSA_SET_STABLE:
1bab1c02 996 pgstev &= ~(_PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT);
2d42f947
CI		 997 pgstev |= _PGSTE_GPS_USAGE_STABLE;
998 break;
999 case ESSA_SET_UNUSED:
1000 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1001 pgstev |= _PGSTE_GPS_USAGE_UNUSED;
1002 if (pte_val(*ptep) & _PAGE_INVALID)
1003 res = 1;
1004 break;
1005 case ESSA_SET_VOLATILE:
1006 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1007 pgstev |= _PGSTE_GPS_USAGE_VOLATILE;
1008 if (pte_val(*ptep) & _PAGE_INVALID)
1009 res = 1;
1010 break;
1011 case ESSA_SET_POT_VOLATILE:
1012 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1013 if (!(pte_val(*ptep) & _PAGE_INVALID)) {
1014 pgstev |= _PGSTE_GPS_USAGE_POT_VOLATILE;
1015 break;
1016 }
1017 if (pgstev & _PGSTE_GPS_ZERO) {
1018 pgstev |= _PGSTE_GPS_USAGE_VOLATILE;
1019 break;
1020 }
1021 if (!(pgstev & PGSTE_GC_BIT)) {
1022 pgstev |= _PGSTE_GPS_USAGE_VOLATILE;
1023 res = 1;
1024 break;
1025 }
1026 break;
1027 case ESSA_SET_STABLE_RESIDENT:
1028 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1029 pgstev |= _PGSTE_GPS_USAGE_STABLE;
1030 /*
1031 * Since the resident state can go away any time after this
1032 * call, we will not make this page resident. We can revisit
1033 * this decision if a guest will ever start using this.
1034 */
1035 break;
1036 case ESSA_SET_STABLE_IF_RESIDENT:
1037 if (!(pte_val(*ptep) & _PAGE_INVALID)) {
1038 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1039 pgstev |= _PGSTE_GPS_USAGE_STABLE;
1040 }
1041 break;
1bab1c02
CI		 1042 case ESSA_SET_STABLE_NODAT:
1043 pgstev &= ~_PGSTE_GPS_USAGE_MASK;
1044 pgstev |= _PGSTE_GPS_USAGE_STABLE | _PGSTE_GPS_NODAT;
1045 break;
2d42f947
CI		 1046 default:
1047 /* we should never get here! */
1048 break;
1049 }
1050 /* If we are discarding a page, set it to logical zero */
1051 if (res)
1052 pgstev |= _PGSTE_GPS_ZERO;
1053
1054 pgste_val(pgste) = pgstev;
1055 pgste_set_unlock(ptep, pgste);
1056 pte_unmap_unlock(ptep, ptl);
1057 return res;
1058}
1059EXPORT_SYMBOL(pgste_perform_essa);
1060
1061/**
1062 * set_pgste_bits - set specific PGSTE bits.
1063 * @mm: the memory context. It must have PGSTEs, no check is performed here!
1064 * @hva: the host virtual address of the page whose PGSTE is to be processed
1065 * @bits: a bitmask representing the bits that will be touched
1066 * @value: the values of the bits to be written. Only the bits in the mask
1067 * will be written.
1068 *
1069 * Return: 0 on success, < 0 in case of error.
1070 */
1071int set_pgste_bits(struct mm_struct *mm, unsigned long hva,
1072 unsigned long bits, unsigned long value)
1073{
1074 spinlock_t *ptl;
1075 pgste_t new;
1076 pte_t *ptep;
1077
1078 ptep = get_locked_pte(mm, hva, &ptl);
1079 if (unlikely(!ptep))
1080 return -EFAULT;
1081 new = pgste_get_lock(ptep);
1082
1083 pgste_val(new) &= ~bits;
1084 pgste_val(new) |= value & bits;
1085
1086 pgste_set_unlock(ptep, new);
1087 pte_unmap_unlock(ptep, ptl);
1088 return 0;
1089}
1090EXPORT_SYMBOL(set_pgste_bits);
1091
1092/**
1093 * get_pgste - get the current PGSTE for the given address.
1094 * @mm: the memory context. It must have PGSTEs, no check is performed here!
1095 * @hva: the host virtual address of the page whose PGSTE is to be processed
1096 * @pgstep: will be written with the current PGSTE for the given address.
1097 *
1098 * Return: 0 on success, < 0 in case of error.
1099 */
1100int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep)
1101{
1102 spinlock_t *ptl;
1103 pte_t *ptep;
1104
1105 ptep = get_locked_pte(mm, hva, &ptl);
1106 if (unlikely(!ptep))
1107 return -EFAULT;
1108 *pgstep = pgste_val(pgste_get(ptep));
1109 pte_unmap_unlock(ptep, ptl);
1110 return 0;
1111}
1112EXPORT_SYMBOL(get_pgste);
1e133ab2 1113#endif
Linux 6.x block layer and io_uring tree(s)