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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Machine specific setup for xen
4 *
5 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
6 */
7
8#include <linux/init.h>
9#include <linux/iscsi_ibft.h>
10#include <linux/sched.h>
11#include <linux/kstrtox.h>
12#include <linux/mm.h>
13#include <linux/pm.h>
14#include <linux/memblock.h>
15#include <linux/cpuidle.h>
16#include <linux/cpufreq.h>
17#include <linux/memory_hotplug.h>
18#include <linux/acpi.h>
19
20#include <asm/elf.h>
21#include <asm/vdso.h>
22#include <asm/e820/api.h>
23#include <asm/setup.h>
24#include <asm/numa.h>
25#include <asm/idtentry.h>
26#include <asm/xen/hypervisor.h>
27#include <asm/xen/hypercall.h>
28
29#include <xen/xen.h>
30#include <xen/page.h>
31#include <xen/interface/callback.h>
32#include <xen/interface/memory.h>
33#include <xen/interface/physdev.h>
34#include <xen/features.h>
35#include <xen/hvc-console.h>
36#include "xen-ops.h"
37
38#define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
39
40/* Number of pages released from the initial allocation. */
41unsigned long xen_released_pages;
42
43/* Memory map would allow PCI passthrough. */
44bool xen_pv_pci_possible;
45
46/* E820 map used during setting up memory. */
47static struct e820_table xen_e820_table __initdata;
48
49/* Number of initially usable memory pages. */
50static unsigned long ini_nr_pages __initdata;
51
52/*
53 * Buffer used to remap identity mapped pages. We only need the virtual space.
54 * The physical page behind this address is remapped as needed to different
55 * buffer pages.
56 */
57#define REMAP_SIZE (P2M_PER_PAGE - 3)
58static struct {
59 unsigned long next_area_mfn;
60 unsigned long target_pfn;
61 unsigned long size;
62 unsigned long mfns[REMAP_SIZE];
63} xen_remap_buf __initdata __aligned(PAGE_SIZE);
64static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
65
66static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
67
68static void __init xen_parse_512gb(void)
69{
70 bool val = false;
71 char *arg;
72
73 arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit");
74 if (!arg)
75 return;
76
77 arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit=");
78 if (!arg)
79 val = true;
80 else if (kstrtobool(arg + strlen("xen_512gb_limit="), &val))
81 return;
82
83 xen_512gb_limit = val;
84}
85
86static void __init xen_del_extra_mem(unsigned long start_pfn,
87 unsigned long n_pfns)
88{
89 int i;
90 unsigned long start_r, size_r;
91
92 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
93 start_r = xen_extra_mem[i].start_pfn;
94 size_r = xen_extra_mem[i].n_pfns;
95
96 /* Start of region. */
97 if (start_r == start_pfn) {
98 BUG_ON(n_pfns > size_r);
99 xen_extra_mem[i].start_pfn += n_pfns;
100 xen_extra_mem[i].n_pfns -= n_pfns;
101 break;
102 }
103 /* End of region. */
104 if (start_r + size_r == start_pfn + n_pfns) {
105 BUG_ON(n_pfns > size_r);
106 xen_extra_mem[i].n_pfns -= n_pfns;
107 break;
108 }
109 /* Mid of region. */
110 if (start_pfn > start_r && start_pfn < start_r + size_r) {
111 BUG_ON(start_pfn + n_pfns > start_r + size_r);
112 xen_extra_mem[i].n_pfns = start_pfn - start_r;
113 /* Calling memblock_reserve() again is okay. */
114 xen_add_extra_mem(start_pfn + n_pfns, start_r + size_r -
115 (start_pfn + n_pfns));
116 break;
117 }
118 }
119 memblock_phys_free(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
120}
121
122/*
123 * Called during boot before the p2m list can take entries beyond the
124 * hypervisor supplied p2m list. Entries in extra mem are to be regarded as
125 * invalid.
126 */
127unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
128{
129 int i;
130
131 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
132 if (pfn >= xen_extra_mem[i].start_pfn &&
133 pfn < xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns)
134 return INVALID_P2M_ENTRY;
135 }
136
137 return IDENTITY_FRAME(pfn);
138}
139
140/*
141 * Mark all pfns of extra mem as invalid in p2m list.
142 */
143void __init xen_inv_extra_mem(void)
144{
145 unsigned long pfn, pfn_s, pfn_e;
146 int i;
147
148 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
149 if (!xen_extra_mem[i].n_pfns)
150 continue;
151 pfn_s = xen_extra_mem[i].start_pfn;
152 pfn_e = pfn_s + xen_extra_mem[i].n_pfns;
153 for (pfn = pfn_s; pfn < pfn_e; pfn++)
154 set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
155 }
156}
157
158/*
159 * Finds the next RAM pfn available in the E820 map after min_pfn.
160 * This function updates min_pfn with the pfn found and returns
161 * the size of that range or zero if not found.
162 */
163static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
164{
165 const struct e820_entry *entry = xen_e820_table.entries;
166 unsigned int i;
167 unsigned long done = 0;
168
169 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
170 unsigned long s_pfn;
171 unsigned long e_pfn;
172
173 if (entry->type != E820_TYPE_RAM)
174 continue;
175
176 e_pfn = PFN_DOWN(entry->addr + entry->size);
177
178 /* We only care about E820 after this */
179 if (e_pfn <= *min_pfn)
180 continue;
181
182 s_pfn = PFN_UP(entry->addr);
183
184 /* If min_pfn falls within the E820 entry, we want to start
185 * at the min_pfn PFN.
186 */
187 if (s_pfn <= *min_pfn) {
188 done = e_pfn - *min_pfn;
189 } else {
190 done = e_pfn - s_pfn;
191 *min_pfn = s_pfn;
192 }
193 break;
194 }
195
196 return done;
197}
198
199static int __init xen_free_mfn(unsigned long mfn)
200{
201 struct xen_memory_reservation reservation = {
202 .address_bits = 0,
203 .extent_order = 0,
204 .domid = DOMID_SELF
205 };
206
207 set_xen_guest_handle(reservation.extent_start, &mfn);
208 reservation.nr_extents = 1;
209
210 return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
211}
212
213/*
214 * This releases a chunk of memory and then does the identity map. It's used
215 * as a fallback if the remapping fails.
216 */
217static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
218 unsigned long end_pfn)
219{
220 unsigned long pfn, end;
221 int ret;
222
223 WARN_ON(start_pfn > end_pfn);
224
225 /* Release pages first. */
226 end = min(end_pfn, ini_nr_pages);
227 for (pfn = start_pfn; pfn < end; pfn++) {
228 unsigned long mfn = pfn_to_mfn(pfn);
229
230 /* Make sure pfn exists to start with */
231 if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
232 continue;
233
234 ret = xen_free_mfn(mfn);
235 WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
236
237 if (ret == 1) {
238 xen_released_pages++;
239 if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
240 break;
241 } else
242 break;
243 }
244
245 set_phys_range_identity(start_pfn, end_pfn);
246}
247
248/*
249 * Helper function to update the p2m and m2p tables and kernel mapping.
250 */
251static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn)
252{
253 struct mmu_update update = {
254 .ptr = ((uint64_t)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE,
255 .val = pfn
256 };
257
258 /* Update p2m */
259 if (!set_phys_to_machine(pfn, mfn)) {
260 WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n",
261 pfn, mfn);
262 BUG();
263 }
264
265 /* Update m2p */
266 if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) {
267 WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n",
268 mfn, pfn);
269 BUG();
270 }
271
272 if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
273 mfn_pte(mfn, PAGE_KERNEL), 0)) {
274 WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",
275 mfn, pfn);
276 BUG();
277 }
278}
279
280/*
281 * This function updates the p2m and m2p tables with an identity map from
282 * start_pfn to start_pfn+size and prepares remapping the underlying RAM of the
283 * original allocation at remap_pfn. The information needed for remapping is
284 * saved in the memory itself to avoid the need for allocating buffers. The
285 * complete remap information is contained in a list of MFNs each containing
286 * up to REMAP_SIZE MFNs and the start target PFN for doing the remap.
287 * This enables us to preserve the original mfn sequence while doing the
288 * remapping at a time when the memory management is capable of allocating
289 * virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and
290 * its callers.
291 */
292static void __init xen_do_set_identity_and_remap_chunk(
293 unsigned long start_pfn, unsigned long size, unsigned long remap_pfn)
294{
295 unsigned long buf = (unsigned long)&xen_remap_buf;
296 unsigned long mfn_save, mfn;
297 unsigned long ident_pfn_iter, remap_pfn_iter;
298 unsigned long ident_end_pfn = start_pfn + size;
299 unsigned long left = size;
300 unsigned int i, chunk;
301
302 WARN_ON(size == 0);
303
304 mfn_save = virt_to_mfn((void *)buf);
305
306 for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
307 ident_pfn_iter < ident_end_pfn;
308 ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) {
309 chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE;
310
311 /* Map first pfn to xen_remap_buf */
312 mfn = pfn_to_mfn(ident_pfn_iter);
313 set_pte_mfn(buf, mfn, PAGE_KERNEL);
314
315 /* Save mapping information in page */
316 xen_remap_buf.next_area_mfn = xen_remap_mfn;
317 xen_remap_buf.target_pfn = remap_pfn_iter;
318 xen_remap_buf.size = chunk;
319 for (i = 0; i < chunk; i++)
320 xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i);
321
322 /* Put remap buf into list. */
323 xen_remap_mfn = mfn;
324
325 /* Set identity map */
326 set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);
327
328 left -= chunk;
329 }
330
331 /* Restore old xen_remap_buf mapping */
332 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
333}
334
335/*
336 * This function takes a contiguous pfn range that needs to be identity mapped
337 * and:
338 *
339 * 1) Finds a new range of pfns to use to remap based on E820 and remap_pfn.
340 * 2) Calls the do_ function to actually do the mapping/remapping work.
341 *
342 * The goal is to not allocate additional memory but to remap the existing
343 * pages. In the case of an error the underlying memory is simply released back
344 * to Xen and not remapped.
345 */
346static unsigned long __init xen_set_identity_and_remap_chunk(
347 unsigned long start_pfn, unsigned long end_pfn, unsigned long remap_pfn)
348{
349 unsigned long pfn;
350 unsigned long i = 0;
351 unsigned long n = end_pfn - start_pfn;
352
353 if (remap_pfn == 0)
354 remap_pfn = ini_nr_pages;
355
356 while (i < n) {
357 unsigned long cur_pfn = start_pfn + i;
358 unsigned long left = n - i;
359 unsigned long size = left;
360 unsigned long remap_range_size;
361
362 /* Do not remap pages beyond the current allocation */
363 if (cur_pfn >= ini_nr_pages) {
364 /* Identity map remaining pages */
365 set_phys_range_identity(cur_pfn, cur_pfn + size);
366 break;
367 }
368 if (cur_pfn + size > ini_nr_pages)
369 size = ini_nr_pages - cur_pfn;
370
371 remap_range_size = xen_find_pfn_range(&remap_pfn);
372 if (!remap_range_size) {
373 pr_warn("Unable to find available pfn range, not remapping identity pages\n");
374 xen_set_identity_and_release_chunk(cur_pfn,
375 cur_pfn + left);
376 break;
377 }
378 /* Adjust size to fit in current e820 RAM region */
379 if (size > remap_range_size)
380 size = remap_range_size;
381
382 xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn);
383
384 /* Update variables to reflect new mappings. */
385 i += size;
386 remap_pfn += size;
387 }
388
389 /*
390 * If the PFNs are currently mapped, their VA mappings need to be
391 * zapped.
392 */
393 for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++)
394 (void)HYPERVISOR_update_va_mapping(
395 (unsigned long)__va(pfn << PAGE_SHIFT),
396 native_make_pte(0), 0);
397
398 return remap_pfn;
399}
400
401static unsigned long __init xen_count_remap_pages(
402 unsigned long start_pfn, unsigned long end_pfn,
403 unsigned long remap_pages)
404{
405 if (start_pfn >= ini_nr_pages)
406 return remap_pages;
407
408 return remap_pages + min(end_pfn, ini_nr_pages) - start_pfn;
409}
410
411static unsigned long __init xen_foreach_remap_area(
412 unsigned long (*func)(unsigned long start_pfn, unsigned long end_pfn,
413 unsigned long last_val))
414{
415 phys_addr_t start = 0;
416 unsigned long ret_val = 0;
417 const struct e820_entry *entry = xen_e820_table.entries;
418 int i;
419
420 /*
421 * Combine non-RAM regions and gaps until a RAM region (or the
422 * end of the map) is reached, then call the provided function
423 * to perform its duty on the non-RAM region.
424 *
425 * The combined non-RAM regions are rounded to a whole number
426 * of pages so any partial pages are accessible via the 1:1
427 * mapping. This is needed for some BIOSes that put (for
428 * example) the DMI tables in a reserved region that begins on
429 * a non-page boundary.
430 */
431 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
432 phys_addr_t end = entry->addr + entry->size;
433 if (entry->type == E820_TYPE_RAM || i == xen_e820_table.nr_entries - 1) {
434 unsigned long start_pfn = PFN_DOWN(start);
435 unsigned long end_pfn = PFN_UP(end);
436
437 if (entry->type == E820_TYPE_RAM)
438 end_pfn = PFN_UP(entry->addr);
439
440 if (start_pfn < end_pfn)
441 ret_val = func(start_pfn, end_pfn, ret_val);
442 start = end;
443 }
444 }
445
446 return ret_val;
447}
448
449/*
450 * Remap the memory prepared in xen_do_set_identity_and_remap_chunk().
451 * The remap information (which mfn remap to which pfn) is contained in the
452 * to be remapped memory itself in a linked list anchored at xen_remap_mfn.
453 * This scheme allows to remap the different chunks in arbitrary order while
454 * the resulting mapping will be independent from the order.
455 */
456void __init xen_remap_memory(void)
457{
458 unsigned long buf = (unsigned long)&xen_remap_buf;
459 unsigned long mfn_save, pfn;
460 unsigned long remapped = 0;
461 unsigned int i;
462 unsigned long pfn_s = ~0UL;
463 unsigned long len = 0;
464
465 mfn_save = virt_to_mfn((void *)buf);
466
467 while (xen_remap_mfn != INVALID_P2M_ENTRY) {
468 /* Map the remap information */
469 set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL);
470
471 BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]);
472
473 pfn = xen_remap_buf.target_pfn;
474 for (i = 0; i < xen_remap_buf.size; i++) {
475 xen_update_mem_tables(pfn, xen_remap_buf.mfns[i]);
476 remapped++;
477 pfn++;
478 }
479 if (pfn_s == ~0UL || pfn == pfn_s) {
480 pfn_s = xen_remap_buf.target_pfn;
481 len += xen_remap_buf.size;
482 } else if (pfn_s + len == xen_remap_buf.target_pfn) {
483 len += xen_remap_buf.size;
484 } else {
485 xen_del_extra_mem(pfn_s, len);
486 pfn_s = xen_remap_buf.target_pfn;
487 len = xen_remap_buf.size;
488 }
489 xen_remap_mfn = xen_remap_buf.next_area_mfn;
490 }
491
492 if (pfn_s != ~0UL && len)
493 xen_del_extra_mem(pfn_s, len);
494
495 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
496
497 pr_info("Remapped %ld page(s)\n", remapped);
498
499 xen_do_remap_nonram();
500}
501
502static unsigned long __init xen_get_pages_limit(void)
503{
504 unsigned long limit;
505
506 limit = MAXMEM / PAGE_SIZE;
507 if (!xen_initial_domain() && xen_512gb_limit)
508 limit = GB(512) / PAGE_SIZE;
509
510 return limit;
511}
512
513static unsigned long __init xen_get_max_pages(void)
514{
515 unsigned long max_pages, limit;
516 domid_t domid = DOMID_SELF;
517 long ret;
518
519 limit = xen_get_pages_limit();
520 max_pages = limit;
521
522 /*
523 * For the initial domain we use the maximum reservation as
524 * the maximum page.
525 *
526 * For guest domains the current maximum reservation reflects
527 * the current maximum rather than the static maximum. In this
528 * case the e820 map provided to us will cover the static
529 * maximum region.
530 */
531 if (xen_initial_domain()) {
532 ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
533 if (ret > 0)
534 max_pages = ret;
535 }
536
537 return min(max_pages, limit);
538}
539
540static void __init xen_align_and_add_e820_region(phys_addr_t start,
541 phys_addr_t size, int type)
542{
543 phys_addr_t end = start + size;
544
545 /* Align RAM regions to page boundaries. */
546 if (type == E820_TYPE_RAM) {
547 start = PAGE_ALIGN(start);
548 end &= ~((phys_addr_t)PAGE_SIZE - 1);
549#ifdef CONFIG_MEMORY_HOTPLUG
550 /*
551 * Don't allow adding memory not in E820 map while booting the
552 * system. Once the balloon driver is up it will remove that
553 * restriction again.
554 */
555 max_mem_size = end;
556#endif
557 }
558
559 e820__range_add(start, end - start, type);
560}
561
562static void __init xen_ignore_unusable(void)
563{
564 struct e820_entry *entry = xen_e820_table.entries;
565 unsigned int i;
566
567 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
568 if (entry->type == E820_TYPE_UNUSABLE)
569 entry->type = E820_TYPE_RAM;
570 }
571}
572
573static bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
574{
575 struct e820_entry *entry;
576 unsigned mapcnt;
577 phys_addr_t end;
578
579 if (!size)
580 return false;
581
582 end = start + size;
583 entry = xen_e820_table.entries;
584
585 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
586 if (entry->type == E820_TYPE_RAM && entry->addr <= start &&
587 (entry->addr + entry->size) >= end)
588 return false;
589
590 entry++;
591 }
592
593 return true;
594}
595
596/*
597 * Find a free area in physical memory not yet reserved and compliant with
598 * E820 map.
599 * Used to relocate pre-allocated areas like initrd or p2m list which are in
600 * conflict with the to be used E820 map.
601 * In case no area is found, return 0. Otherwise return the physical address
602 * of the area which is already reserved for convenience.
603 */
604phys_addr_t __init xen_find_free_area(phys_addr_t size)
605{
606 unsigned mapcnt;
607 phys_addr_t addr, start;
608 struct e820_entry *entry = xen_e820_table.entries;
609
610 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++, entry++) {
611 if (entry->type != E820_TYPE_RAM || entry->size < size)
612 continue;
613 start = entry->addr;
614 for (addr = start; addr < start + size; addr += PAGE_SIZE) {
615 if (!memblock_is_reserved(addr))
616 continue;
617 start = addr + PAGE_SIZE;
618 if (start + size > entry->addr + entry->size)
619 break;
620 }
621 if (addr >= start + size) {
622 memblock_reserve(start, size);
623 return start;
624 }
625 }
626
627 return 0;
628}
629
630/*
631 * Swap a non-RAM E820 map entry with RAM above ini_nr_pages.
632 * Note that the E820 map is modified accordingly, but the P2M map isn't yet.
633 * The adaption of the P2M must be deferred until page allocation is possible.
634 */
635static void __init xen_e820_swap_entry_with_ram(struct e820_entry *swap_entry)
636{
637 struct e820_entry *entry;
638 unsigned int mapcnt;
639 phys_addr_t mem_end = PFN_PHYS(ini_nr_pages);
640 phys_addr_t swap_addr, swap_size, entry_end;
641
642 swap_addr = PAGE_ALIGN_DOWN(swap_entry->addr);
643 swap_size = PAGE_ALIGN(swap_entry->addr - swap_addr + swap_entry->size);
644 entry = xen_e820_table.entries;
645
646 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
647 entry_end = entry->addr + entry->size;
648 if (entry->type == E820_TYPE_RAM && entry->size >= swap_size &&
649 entry_end - swap_size >= mem_end) {
650 /* Reduce RAM entry by needed space (whole pages). */
651 entry->size -= swap_size;
652
653 /* Add new entry at the end of E820 map. */
654 entry = xen_e820_table.entries +
655 xen_e820_table.nr_entries;
656 xen_e820_table.nr_entries++;
657
658 /* Fill new entry (keep size and page offset). */
659 entry->type = swap_entry->type;
660 entry->addr = entry_end - swap_size +
661 swap_addr - swap_entry->addr;
662 entry->size = swap_entry->size;
663
664 /* Convert old entry to RAM, align to pages. */
665 swap_entry->type = E820_TYPE_RAM;
666 swap_entry->addr = swap_addr;
667 swap_entry->size = swap_size;
668
669 /* Remember PFN<->MFN relation for P2M update. */
670 xen_add_remap_nonram(swap_addr, entry_end - swap_size,
671 swap_size);
672
673 /* Order E820 table and merge entries. */
674 e820__update_table(&xen_e820_table);
675
676 return;
677 }
678
679 entry++;
680 }
681
682 xen_raw_console_write("No suitable area found for required E820 entry remapping action\n");
683 BUG();
684}
685
686/*
687 * Look for non-RAM memory types in a specific guest physical area and move
688 * those away if possible (ACPI NVS only for now).
689 */
690static void __init xen_e820_resolve_conflicts(phys_addr_t start,
691 phys_addr_t size)
692{
693 struct e820_entry *entry;
694 unsigned int mapcnt;
695 phys_addr_t end;
696
697 if (!size)
698 return;
699
700 end = start + size;
701 entry = xen_e820_table.entries;
702
703 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
704 if (entry->addr >= end)
705 return;
706
707 if (entry->addr + entry->size > start &&
708 entry->type == E820_TYPE_NVS)
709 xen_e820_swap_entry_with_ram(entry);
710
711 entry++;
712 }
713}
714
715/*
716 * Check for an area in physical memory to be usable for non-movable purposes.
717 * An area is considered to usable if the used E820 map lists it to be RAM or
718 * some other type which can be moved to higher PFNs while keeping the MFNs.
719 * In case the area is not usable, crash the system with an error message.
720 */
721void __init xen_chk_is_e820_usable(phys_addr_t start, phys_addr_t size,
722 const char *component)
723{
724 xen_e820_resolve_conflicts(start, size);
725
726 if (!xen_is_e820_reserved(start, size))
727 return;
728
729 xen_raw_console_write("Xen hypervisor allocated ");
730 xen_raw_console_write(component);
731 xen_raw_console_write(" memory conflicts with E820 map\n");
732 BUG();
733}
734
735/*
736 * Like memcpy, but with physical addresses for dest and src.
737 */
738static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src,
739 phys_addr_t n)
740{
741 phys_addr_t dest_off, src_off, dest_len, src_len, len;
742 void *from, *to;
743
744 while (n) {
745 dest_off = dest & ~PAGE_MASK;
746 src_off = src & ~PAGE_MASK;
747 dest_len = n;
748 if (dest_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off)
749 dest_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off;
750 src_len = n;
751 if (src_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off)
752 src_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off;
753 len = min(dest_len, src_len);
754 to = early_memremap(dest - dest_off, dest_len + dest_off);
755 from = early_memremap(src - src_off, src_len + src_off);
756 memcpy(to, from, len);
757 early_memunmap(to, dest_len + dest_off);
758 early_memunmap(from, src_len + src_off);
759 n -= len;
760 dest += len;
761 src += len;
762 }
763}
764
765/*
766 * Reserve Xen mfn_list.
767 */
768static void __init xen_reserve_xen_mfnlist(void)
769{
770 phys_addr_t start, size;
771
772 if (xen_start_info->mfn_list >= __START_KERNEL_map) {
773 start = __pa(xen_start_info->mfn_list);
774 size = PFN_ALIGN(xen_start_info->nr_pages *
775 sizeof(unsigned long));
776 } else {
777 start = PFN_PHYS(xen_start_info->first_p2m_pfn);
778 size = PFN_PHYS(xen_start_info->nr_p2m_frames);
779 }
780
781 memblock_reserve(start, size);
782 if (!xen_is_e820_reserved(start, size))
783 return;
784
785 xen_relocate_p2m();
786 memblock_phys_free(start, size);
787}
788
789/**
790 * xen_memory_setup - Hook for machine specific memory setup.
791 **/
792char * __init xen_memory_setup(void)
793{
794 unsigned long pfn_s, n_pfns;
795 phys_addr_t mem_end, addr, size, chunk_size;
796 u32 type;
797 int rc;
798 struct xen_memory_map memmap;
799 unsigned long max_pages;
800 unsigned long extra_pages = 0;
801 unsigned long maxmem_pages;
802 int i;
803 int op;
804
805 xen_parse_512gb();
806 ini_nr_pages = min(xen_get_pages_limit(), xen_start_info->nr_pages);
807 mem_end = PFN_PHYS(ini_nr_pages);
808
809 memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
810 set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
811
812#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_XEN_BALLOON)
813 xen_saved_max_mem_size = max_mem_size;
814#endif
815
816 op = xen_initial_domain() ?
817 XENMEM_machine_memory_map :
818 XENMEM_memory_map;
819 rc = HYPERVISOR_memory_op(op, &memmap);
820 if (rc == -ENOSYS) {
821 BUG_ON(xen_initial_domain());
822 memmap.nr_entries = 1;
823 xen_e820_table.entries[0].addr = 0ULL;
824 xen_e820_table.entries[0].size = mem_end;
825 /* 8MB slack (to balance backend allocations). */
826 xen_e820_table.entries[0].size += 8ULL << 20;
827 xen_e820_table.entries[0].type = E820_TYPE_RAM;
828 rc = 0;
829 }
830 BUG_ON(rc);
831 BUG_ON(memmap.nr_entries == 0);
832 xen_e820_table.nr_entries = memmap.nr_entries;
833
834 if (xen_initial_domain()) {
835 /*
836 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
837 * regions, so if we're using the machine memory map leave the
838 * region as RAM as it is in the pseudo-physical map.
839 *
840 * UNUSABLE regions in domUs are not handled and will need
841 * a patch in the future.
842 */
843 xen_ignore_unusable();
844
845#ifdef CONFIG_ISCSI_IBFT_FIND
846 /* Reserve 0.5 MiB to 1 MiB region so iBFT can be found */
847 xen_e820_table.entries[xen_e820_table.nr_entries].addr = IBFT_START;
848 xen_e820_table.entries[xen_e820_table.nr_entries].size = IBFT_END - IBFT_START;
849 xen_e820_table.entries[xen_e820_table.nr_entries].type = E820_TYPE_RESERVED;
850 xen_e820_table.nr_entries++;
851#endif
852 }
853
854 /* Make sure the Xen-supplied memory map is well-ordered. */
855 e820__update_table(&xen_e820_table);
856
857 /*
858 * Check whether the kernel itself conflicts with the target E820 map.
859 * Failing now is better than running into weird problems later due
860 * to relocating (and even reusing) pages with kernel text or data.
861 */
862 xen_chk_is_e820_usable(__pa_symbol(_text),
863 __pa_symbol(_end) - __pa_symbol(_text),
864 "kernel");
865
866 /*
867 * Check for a conflict of the xen_start_info memory with the target
868 * E820 map.
869 */
870 xen_chk_is_e820_usable(__pa(xen_start_info), sizeof(*xen_start_info),
871 "xen_start_info");
872
873 /*
874 * Check for a conflict of the hypervisor supplied page tables with
875 * the target E820 map.
876 */
877 xen_pt_check_e820();
878
879 max_pages = xen_get_max_pages();
880
881 /* How many extra pages do we need due to remapping? */
882 max_pages += xen_foreach_remap_area(xen_count_remap_pages);
883
884 if (max_pages > ini_nr_pages)
885 extra_pages += max_pages - ini_nr_pages;
886
887 /*
888 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
889 * factor the base size.
890 *
891 * Make sure we have no memory above max_pages, as this area
892 * isn't handled by the p2m management.
893 */
894 maxmem_pages = EXTRA_MEM_RATIO * min(ini_nr_pages, PFN_DOWN(MAXMEM));
895 extra_pages = min3(maxmem_pages, extra_pages, max_pages - ini_nr_pages);
896 i = 0;
897 addr = xen_e820_table.entries[0].addr;
898 size = xen_e820_table.entries[0].size;
899 while (i < xen_e820_table.nr_entries) {
900 bool discard = false;
901
902 chunk_size = size;
903 type = xen_e820_table.entries[i].type;
904
905 if (type == E820_TYPE_RESERVED)
906 xen_pv_pci_possible = true;
907
908 if (type == E820_TYPE_RAM) {
909 if (addr < mem_end) {
910 chunk_size = min(size, mem_end - addr);
911 } else if (extra_pages) {
912 chunk_size = min(size, PFN_PHYS(extra_pages));
913 pfn_s = PFN_UP(addr);
914 n_pfns = PFN_DOWN(addr + chunk_size) - pfn_s;
915 extra_pages -= n_pfns;
916 xen_add_extra_mem(pfn_s, n_pfns);
917 xen_max_p2m_pfn = pfn_s + n_pfns;
918 } else
919 discard = true;
920 }
921
922 if (!discard)
923 xen_align_and_add_e820_region(addr, chunk_size, type);
924
925 addr += chunk_size;
926 size -= chunk_size;
927 if (size == 0) {
928 i++;
929 if (i < xen_e820_table.nr_entries) {
930 addr = xen_e820_table.entries[i].addr;
931 size = xen_e820_table.entries[i].size;
932 }
933 }
934 }
935
936 /*
937 * Set the rest as identity mapped, in case PCI BARs are
938 * located here.
939 */
940 set_phys_range_identity(addr / PAGE_SIZE, ~0ul);
941
942 /*
943 * In domU, the ISA region is normal, usable memory, but we
944 * reserve ISA memory anyway because too many things poke
945 * about in there.
946 */
947 e820__range_add(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_TYPE_RESERVED);
948
949 e820__update_table(e820_table);
950
951 xen_reserve_xen_mfnlist();
952
953 /* Check for a conflict of the initrd with the target E820 map. */
954 if (xen_is_e820_reserved(boot_params.hdr.ramdisk_image,
955 boot_params.hdr.ramdisk_size)) {
956 phys_addr_t new_area, start, size;
957
958 new_area = xen_find_free_area(boot_params.hdr.ramdisk_size);
959 if (!new_area) {
960 xen_raw_console_write("Can't find new memory area for initrd needed due to E820 map conflict\n");
961 BUG();
962 }
963
964 start = boot_params.hdr.ramdisk_image;
965 size = boot_params.hdr.ramdisk_size;
966 xen_phys_memcpy(new_area, start, size);
967 pr_info("initrd moved from [mem %#010llx-%#010llx] to [mem %#010llx-%#010llx]\n",
968 start, start + size, new_area, new_area + size);
969 memblock_phys_free(start, size);
970 boot_params.hdr.ramdisk_image = new_area;
971 boot_params.ext_ramdisk_image = new_area >> 32;
972 }
973
974 /*
975 * Set identity map on non-RAM pages and prepare remapping the
976 * underlying RAM.
977 */
978 xen_foreach_remap_area(xen_set_identity_and_remap_chunk);
979
980 pr_info("Released %ld page(s)\n", xen_released_pages);
981
982 return "Xen";
983}
984
985static int register_callback(unsigned type, const void *func)
986{
987 struct callback_register callback = {
988 .type = type,
989 .address = XEN_CALLBACK(__KERNEL_CS, func),
990 .flags = CALLBACKF_mask_events,
991 };
992
993 return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
994}
995
996void xen_enable_sysenter(void)
997{
998 if (cpu_feature_enabled(X86_FEATURE_SYSENTER32) &&
999 register_callback(CALLBACKTYPE_sysenter, xen_entry_SYSENTER_compat))
1000 setup_clear_cpu_cap(X86_FEATURE_SYSENTER32);
1001}
1002
1003void xen_enable_syscall(void)
1004{
1005 int ret;
1006
1007 ret = register_callback(CALLBACKTYPE_syscall, xen_entry_SYSCALL_64);
1008 if (ret != 0) {
1009 printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
1010 /* Pretty fatal; 64-bit userspace has no other
1011 mechanism for syscalls. */
1012 }
1013
1014 if (cpu_feature_enabled(X86_FEATURE_SYSCALL32) &&
1015 register_callback(CALLBACKTYPE_syscall32, xen_entry_SYSCALL_compat))
1016 setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
1017}
1018
1019static void __init xen_pvmmu_arch_setup(void)
1020{
1021 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
1022
1023 if (register_callback(CALLBACKTYPE_event,
1024 xen_asm_exc_xen_hypervisor_callback) ||
1025 register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
1026 BUG();
1027
1028 xen_enable_sysenter();
1029 xen_enable_syscall();
1030}
1031
1032/* This function is not called for HVM domains */
1033void __init xen_arch_setup(void)
1034{
1035 xen_panic_handler_init();
1036 xen_pvmmu_arch_setup();
1037
1038#ifdef CONFIG_ACPI
1039 if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
1040 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
1041 disable_acpi();
1042 }
1043#endif
1044
1045 memcpy(boot_command_line, xen_start_info->cmd_line,
1046 MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
1047 COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
1048
1049 /* Set up idle, making sure it calls safe_halt() pvop */
1050 disable_cpuidle();
1051 disable_cpufreq();
1052 WARN_ON(xen_set_default_idle());
1053#ifdef CONFIG_NUMA
1054 numa_off = 1;
1055#endif
1056}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Machine specific setup for xen
4 *
5 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
6 */
7
8#include <linux/init.h>
9#include <linux/sched.h>
10#include <linux/mm.h>
11#include <linux/pm.h>
12#include <linux/memblock.h>
13#include <linux/cpuidle.h>
14#include <linux/cpufreq.h>
15
16#include <asm/elf.h>
17#include <asm/vdso.h>
18#include <asm/e820/api.h>
19#include <asm/setup.h>
20#include <asm/acpi.h>
21#include <asm/numa.h>
22#include <asm/xen/hypervisor.h>
23#include <asm/xen/hypercall.h>
24
25#include <xen/xen.h>
26#include <xen/page.h>
27#include <xen/interface/callback.h>
28#include <xen/interface/memory.h>
29#include <xen/interface/physdev.h>
30#include <xen/features.h>
31#include <xen/hvc-console.h>
32#include "xen-ops.h"
33#include "vdso.h"
34#include "mmu.h"
35
36#define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
37
38/* Amount of extra memory space we add to the e820 ranges */
39struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
40
41/* Number of pages released from the initial allocation. */
42unsigned long xen_released_pages;
43
44/* E820 map used during setting up memory. */
45static struct e820_table xen_e820_table __initdata;
46
47/*
48 * Buffer used to remap identity mapped pages. We only need the virtual space.
49 * The physical page behind this address is remapped as needed to different
50 * buffer pages.
51 */
52#define REMAP_SIZE (P2M_PER_PAGE - 3)
53static struct {
54 unsigned long next_area_mfn;
55 unsigned long target_pfn;
56 unsigned long size;
57 unsigned long mfns[REMAP_SIZE];
58} xen_remap_buf __initdata __aligned(PAGE_SIZE);
59static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
60
61/*
62 * The maximum amount of extra memory compared to the base size. The
63 * main scaling factor is the size of struct page. At extreme ratios
64 * of base:extra, all the base memory can be filled with page
65 * structures for the extra memory, leaving no space for anything
66 * else.
67 *
68 * 10x seems like a reasonable balance between scaling flexibility and
69 * leaving a practically usable system.
70 */
71#define EXTRA_MEM_RATIO (10)
72
73static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
74
75static void __init xen_parse_512gb(void)
76{
77 bool val = false;
78 char *arg;
79
80 arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit");
81 if (!arg)
82 return;
83
84 arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit=");
85 if (!arg)
86 val = true;
87 else if (strtobool(arg + strlen("xen_512gb_limit="), &val))
88 return;
89
90 xen_512gb_limit = val;
91}
92
93static void __init xen_add_extra_mem(unsigned long start_pfn,
94 unsigned long n_pfns)
95{
96 int i;
97
98 /*
99 * No need to check for zero size, should happen rarely and will only
100 * write a new entry regarded to be unused due to zero size.
101 */
102 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
103 /* Add new region. */
104 if (xen_extra_mem[i].n_pfns == 0) {
105 xen_extra_mem[i].start_pfn = start_pfn;
106 xen_extra_mem[i].n_pfns = n_pfns;
107 break;
108 }
109 /* Append to existing region. */
110 if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
111 start_pfn) {
112 xen_extra_mem[i].n_pfns += n_pfns;
113 break;
114 }
115 }
116 if (i == XEN_EXTRA_MEM_MAX_REGIONS)
117 printk(KERN_WARNING "Warning: not enough extra memory regions\n");
118
119 memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
120}
121
122static void __init xen_del_extra_mem(unsigned long start_pfn,
123 unsigned long n_pfns)
124{
125 int i;
126 unsigned long start_r, size_r;
127
128 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
129 start_r = xen_extra_mem[i].start_pfn;
130 size_r = xen_extra_mem[i].n_pfns;
131
132 /* Start of region. */
133 if (start_r == start_pfn) {
134 BUG_ON(n_pfns > size_r);
135 xen_extra_mem[i].start_pfn += n_pfns;
136 xen_extra_mem[i].n_pfns -= n_pfns;
137 break;
138 }
139 /* End of region. */
140 if (start_r + size_r == start_pfn + n_pfns) {
141 BUG_ON(n_pfns > size_r);
142 xen_extra_mem[i].n_pfns -= n_pfns;
143 break;
144 }
145 /* Mid of region. */
146 if (start_pfn > start_r && start_pfn < start_r + size_r) {
147 BUG_ON(start_pfn + n_pfns > start_r + size_r);
148 xen_extra_mem[i].n_pfns = start_pfn - start_r;
149 /* Calling memblock_reserve() again is okay. */
150 xen_add_extra_mem(start_pfn + n_pfns, start_r + size_r -
151 (start_pfn + n_pfns));
152 break;
153 }
154 }
155 memblock_free(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
156}
157
158/*
159 * Called during boot before the p2m list can take entries beyond the
160 * hypervisor supplied p2m list. Entries in extra mem are to be regarded as
161 * invalid.
162 */
163unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
164{
165 int i;
166
167 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
168 if (pfn >= xen_extra_mem[i].start_pfn &&
169 pfn < xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns)
170 return INVALID_P2M_ENTRY;
171 }
172
173 return IDENTITY_FRAME(pfn);
174}
175
176/*
177 * Mark all pfns of extra mem as invalid in p2m list.
178 */
179void __init xen_inv_extra_mem(void)
180{
181 unsigned long pfn, pfn_s, pfn_e;
182 int i;
183
184 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
185 if (!xen_extra_mem[i].n_pfns)
186 continue;
187 pfn_s = xen_extra_mem[i].start_pfn;
188 pfn_e = pfn_s + xen_extra_mem[i].n_pfns;
189 for (pfn = pfn_s; pfn < pfn_e; pfn++)
190 set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
191 }
192}
193
194/*
195 * Finds the next RAM pfn available in the E820 map after min_pfn.
196 * This function updates min_pfn with the pfn found and returns
197 * the size of that range or zero if not found.
198 */
199static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
200{
201 const struct e820_entry *entry = xen_e820_table.entries;
202 unsigned int i;
203 unsigned long done = 0;
204
205 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
206 unsigned long s_pfn;
207 unsigned long e_pfn;
208
209 if (entry->type != E820_TYPE_RAM)
210 continue;
211
212 e_pfn = PFN_DOWN(entry->addr + entry->size);
213
214 /* We only care about E820 after this */
215 if (e_pfn <= *min_pfn)
216 continue;
217
218 s_pfn = PFN_UP(entry->addr);
219
220 /* If min_pfn falls within the E820 entry, we want to start
221 * at the min_pfn PFN.
222 */
223 if (s_pfn <= *min_pfn) {
224 done = e_pfn - *min_pfn;
225 } else {
226 done = e_pfn - s_pfn;
227 *min_pfn = s_pfn;
228 }
229 break;
230 }
231
232 return done;
233}
234
235static int __init xen_free_mfn(unsigned long mfn)
236{
237 struct xen_memory_reservation reservation = {
238 .address_bits = 0,
239 .extent_order = 0,
240 .domid = DOMID_SELF
241 };
242
243 set_xen_guest_handle(reservation.extent_start, &mfn);
244 reservation.nr_extents = 1;
245
246 return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
247}
248
249/*
250 * This releases a chunk of memory and then does the identity map. It's used
251 * as a fallback if the remapping fails.
252 */
253static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
254 unsigned long end_pfn, unsigned long nr_pages)
255{
256 unsigned long pfn, end;
257 int ret;
258
259 WARN_ON(start_pfn > end_pfn);
260
261 /* Release pages first. */
262 end = min(end_pfn, nr_pages);
263 for (pfn = start_pfn; pfn < end; pfn++) {
264 unsigned long mfn = pfn_to_mfn(pfn);
265
266 /* Make sure pfn exists to start with */
267 if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
268 continue;
269
270 ret = xen_free_mfn(mfn);
271 WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
272
273 if (ret == 1) {
274 xen_released_pages++;
275 if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
276 break;
277 } else
278 break;
279 }
280
281 set_phys_range_identity(start_pfn, end_pfn);
282}
283
284/*
285 * Helper function to update the p2m and m2p tables and kernel mapping.
286 */
287static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn)
288{
289 struct mmu_update update = {
290 .ptr = ((uint64_t)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE,
291 .val = pfn
292 };
293
294 /* Update p2m */
295 if (!set_phys_to_machine(pfn, mfn)) {
296 WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n",
297 pfn, mfn);
298 BUG();
299 }
300
301 /* Update m2p */
302 if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) {
303 WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n",
304 mfn, pfn);
305 BUG();
306 }
307
308 /* Update kernel mapping, but not for highmem. */
309 if (pfn >= PFN_UP(__pa(high_memory - 1)))
310 return;
311
312 if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
313 mfn_pte(mfn, PAGE_KERNEL), 0)) {
314 WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",
315 mfn, pfn);
316 BUG();
317 }
318}
319
320/*
321 * This function updates the p2m and m2p tables with an identity map from
322 * start_pfn to start_pfn+size and prepares remapping the underlying RAM of the
323 * original allocation at remap_pfn. The information needed for remapping is
324 * saved in the memory itself to avoid the need for allocating buffers. The
325 * complete remap information is contained in a list of MFNs each containing
326 * up to REMAP_SIZE MFNs and the start target PFN for doing the remap.
327 * This enables us to preserve the original mfn sequence while doing the
328 * remapping at a time when the memory management is capable of allocating
329 * virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and
330 * its callers.
331 */
332static void __init xen_do_set_identity_and_remap_chunk(
333 unsigned long start_pfn, unsigned long size, unsigned long remap_pfn)
334{
335 unsigned long buf = (unsigned long)&xen_remap_buf;
336 unsigned long mfn_save, mfn;
337 unsigned long ident_pfn_iter, remap_pfn_iter;
338 unsigned long ident_end_pfn = start_pfn + size;
339 unsigned long left = size;
340 unsigned int i, chunk;
341
342 WARN_ON(size == 0);
343
344 mfn_save = virt_to_mfn(buf);
345
346 for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
347 ident_pfn_iter < ident_end_pfn;
348 ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) {
349 chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE;
350
351 /* Map first pfn to xen_remap_buf */
352 mfn = pfn_to_mfn(ident_pfn_iter);
353 set_pte_mfn(buf, mfn, PAGE_KERNEL);
354
355 /* Save mapping information in page */
356 xen_remap_buf.next_area_mfn = xen_remap_mfn;
357 xen_remap_buf.target_pfn = remap_pfn_iter;
358 xen_remap_buf.size = chunk;
359 for (i = 0; i < chunk; i++)
360 xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i);
361
362 /* Put remap buf into list. */
363 xen_remap_mfn = mfn;
364
365 /* Set identity map */
366 set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);
367
368 left -= chunk;
369 }
370
371 /* Restore old xen_remap_buf mapping */
372 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
373}
374
375/*
376 * This function takes a contiguous pfn range that needs to be identity mapped
377 * and:
378 *
379 * 1) Finds a new range of pfns to use to remap based on E820 and remap_pfn.
380 * 2) Calls the do_ function to actually do the mapping/remapping work.
381 *
382 * The goal is to not allocate additional memory but to remap the existing
383 * pages. In the case of an error the underlying memory is simply released back
384 * to Xen and not remapped.
385 */
386static unsigned long __init xen_set_identity_and_remap_chunk(
387 unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
388 unsigned long remap_pfn)
389{
390 unsigned long pfn;
391 unsigned long i = 0;
392 unsigned long n = end_pfn - start_pfn;
393
394 if (remap_pfn == 0)
395 remap_pfn = nr_pages;
396
397 while (i < n) {
398 unsigned long cur_pfn = start_pfn + i;
399 unsigned long left = n - i;
400 unsigned long size = left;
401 unsigned long remap_range_size;
402
403 /* Do not remap pages beyond the current allocation */
404 if (cur_pfn >= nr_pages) {
405 /* Identity map remaining pages */
406 set_phys_range_identity(cur_pfn, cur_pfn + size);
407 break;
408 }
409 if (cur_pfn + size > nr_pages)
410 size = nr_pages - cur_pfn;
411
412 remap_range_size = xen_find_pfn_range(&remap_pfn);
413 if (!remap_range_size) {
414 pr_warning("Unable to find available pfn range, not remapping identity pages\n");
415 xen_set_identity_and_release_chunk(cur_pfn,
416 cur_pfn + left, nr_pages);
417 break;
418 }
419 /* Adjust size to fit in current e820 RAM region */
420 if (size > remap_range_size)
421 size = remap_range_size;
422
423 xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn);
424
425 /* Update variables to reflect new mappings. */
426 i += size;
427 remap_pfn += size;
428 }
429
430 /*
431 * If the PFNs are currently mapped, the VA mapping also needs
432 * to be updated to be 1:1.
433 */
434 for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++)
435 (void)HYPERVISOR_update_va_mapping(
436 (unsigned long)__va(pfn << PAGE_SHIFT),
437 mfn_pte(pfn, PAGE_KERNEL_IO), 0);
438
439 return remap_pfn;
440}
441
442static unsigned long __init xen_count_remap_pages(
443 unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
444 unsigned long remap_pages)
445{
446 if (start_pfn >= nr_pages)
447 return remap_pages;
448
449 return remap_pages + min(end_pfn, nr_pages) - start_pfn;
450}
451
452static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
453 unsigned long (*func)(unsigned long start_pfn, unsigned long end_pfn,
454 unsigned long nr_pages, unsigned long last_val))
455{
456 phys_addr_t start = 0;
457 unsigned long ret_val = 0;
458 const struct e820_entry *entry = xen_e820_table.entries;
459 int i;
460
461 /*
462 * Combine non-RAM regions and gaps until a RAM region (or the
463 * end of the map) is reached, then call the provided function
464 * to perform its duty on the non-RAM region.
465 *
466 * The combined non-RAM regions are rounded to a whole number
467 * of pages so any partial pages are accessible via the 1:1
468 * mapping. This is needed for some BIOSes that put (for
469 * example) the DMI tables in a reserved region that begins on
470 * a non-page boundary.
471 */
472 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
473 phys_addr_t end = entry->addr + entry->size;
474 if (entry->type == E820_TYPE_RAM || i == xen_e820_table.nr_entries - 1) {
475 unsigned long start_pfn = PFN_DOWN(start);
476 unsigned long end_pfn = PFN_UP(end);
477
478 if (entry->type == E820_TYPE_RAM)
479 end_pfn = PFN_UP(entry->addr);
480
481 if (start_pfn < end_pfn)
482 ret_val = func(start_pfn, end_pfn, nr_pages,
483 ret_val);
484 start = end;
485 }
486 }
487
488 return ret_val;
489}
490
491/*
492 * Remap the memory prepared in xen_do_set_identity_and_remap_chunk().
493 * The remap information (which mfn remap to which pfn) is contained in the
494 * to be remapped memory itself in a linked list anchored at xen_remap_mfn.
495 * This scheme allows to remap the different chunks in arbitrary order while
496 * the resulting mapping will be independant from the order.
497 */
498void __init xen_remap_memory(void)
499{
500 unsigned long buf = (unsigned long)&xen_remap_buf;
501 unsigned long mfn_save, pfn;
502 unsigned long remapped = 0;
503 unsigned int i;
504 unsigned long pfn_s = ~0UL;
505 unsigned long len = 0;
506
507 mfn_save = virt_to_mfn(buf);
508
509 while (xen_remap_mfn != INVALID_P2M_ENTRY) {
510 /* Map the remap information */
511 set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL);
512
513 BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]);
514
515 pfn = xen_remap_buf.target_pfn;
516 for (i = 0; i < xen_remap_buf.size; i++) {
517 xen_update_mem_tables(pfn, xen_remap_buf.mfns[i]);
518 remapped++;
519 pfn++;
520 }
521 if (pfn_s == ~0UL || pfn == pfn_s) {
522 pfn_s = xen_remap_buf.target_pfn;
523 len += xen_remap_buf.size;
524 } else if (pfn_s + len == xen_remap_buf.target_pfn) {
525 len += xen_remap_buf.size;
526 } else {
527 xen_del_extra_mem(pfn_s, len);
528 pfn_s = xen_remap_buf.target_pfn;
529 len = xen_remap_buf.size;
530 }
531 xen_remap_mfn = xen_remap_buf.next_area_mfn;
532 }
533
534 if (pfn_s != ~0UL && len)
535 xen_del_extra_mem(pfn_s, len);
536
537 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
538
539 pr_info("Remapped %ld page(s)\n", remapped);
540}
541
542static unsigned long __init xen_get_pages_limit(void)
543{
544 unsigned long limit;
545
546#ifdef CONFIG_X86_32
547 limit = GB(64) / PAGE_SIZE;
548#else
549 limit = MAXMEM / PAGE_SIZE;
550 if (!xen_initial_domain() && xen_512gb_limit)
551 limit = GB(512) / PAGE_SIZE;
552#endif
553 return limit;
554}
555
556static unsigned long __init xen_get_max_pages(void)
557{
558 unsigned long max_pages, limit;
559 domid_t domid = DOMID_SELF;
560 long ret;
561
562 limit = xen_get_pages_limit();
563 max_pages = limit;
564
565 /*
566 * For the initial domain we use the maximum reservation as
567 * the maximum page.
568 *
569 * For guest domains the current maximum reservation reflects
570 * the current maximum rather than the static maximum. In this
571 * case the e820 map provided to us will cover the static
572 * maximum region.
573 */
574 if (xen_initial_domain()) {
575 ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
576 if (ret > 0)
577 max_pages = ret;
578 }
579
580 return min(max_pages, limit);
581}
582
583static void __init xen_align_and_add_e820_region(phys_addr_t start,
584 phys_addr_t size, int type)
585{
586 phys_addr_t end = start + size;
587
588 /* Align RAM regions to page boundaries. */
589 if (type == E820_TYPE_RAM) {
590 start = PAGE_ALIGN(start);
591 end &= ~((phys_addr_t)PAGE_SIZE - 1);
592 }
593
594 e820__range_add(start, end - start, type);
595}
596
597static void __init xen_ignore_unusable(void)
598{
599 struct e820_entry *entry = xen_e820_table.entries;
600 unsigned int i;
601
602 for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
603 if (entry->type == E820_TYPE_UNUSABLE)
604 entry->type = E820_TYPE_RAM;
605 }
606}
607
608bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
609{
610 struct e820_entry *entry;
611 unsigned mapcnt;
612 phys_addr_t end;
613
614 if (!size)
615 return false;
616
617 end = start + size;
618 entry = xen_e820_table.entries;
619
620 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
621 if (entry->type == E820_TYPE_RAM && entry->addr <= start &&
622 (entry->addr + entry->size) >= end)
623 return false;
624
625 entry++;
626 }
627
628 return true;
629}
630
631/*
632 * Find a free area in physical memory not yet reserved and compliant with
633 * E820 map.
634 * Used to relocate pre-allocated areas like initrd or p2m list which are in
635 * conflict with the to be used E820 map.
636 * In case no area is found, return 0. Otherwise return the physical address
637 * of the area which is already reserved for convenience.
638 */
639phys_addr_t __init xen_find_free_area(phys_addr_t size)
640{
641 unsigned mapcnt;
642 phys_addr_t addr, start;
643 struct e820_entry *entry = xen_e820_table.entries;
644
645 for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++, entry++) {
646 if (entry->type != E820_TYPE_RAM || entry->size < size)
647 continue;
648 start = entry->addr;
649 for (addr = start; addr < start + size; addr += PAGE_SIZE) {
650 if (!memblock_is_reserved(addr))
651 continue;
652 start = addr + PAGE_SIZE;
653 if (start + size > entry->addr + entry->size)
654 break;
655 }
656 if (addr >= start + size) {
657 memblock_reserve(start, size);
658 return start;
659 }
660 }
661
662 return 0;
663}
664
665/*
666 * Like memcpy, but with physical addresses for dest and src.
667 */
668static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src,
669 phys_addr_t n)
670{
671 phys_addr_t dest_off, src_off, dest_len, src_len, len;
672 void *from, *to;
673
674 while (n) {
675 dest_off = dest & ~PAGE_MASK;
676 src_off = src & ~PAGE_MASK;
677 dest_len = n;
678 if (dest_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off)
679 dest_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off;
680 src_len = n;
681 if (src_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off)
682 src_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off;
683 len = min(dest_len, src_len);
684 to = early_memremap(dest - dest_off, dest_len + dest_off);
685 from = early_memremap(src - src_off, src_len + src_off);
686 memcpy(to, from, len);
687 early_memunmap(to, dest_len + dest_off);
688 early_memunmap(from, src_len + src_off);
689 n -= len;
690 dest += len;
691 src += len;
692 }
693}
694
695/*
696 * Reserve Xen mfn_list.
697 */
698static void __init xen_reserve_xen_mfnlist(void)
699{
700 phys_addr_t start, size;
701
702 if (xen_start_info->mfn_list >= __START_KERNEL_map) {
703 start = __pa(xen_start_info->mfn_list);
704 size = PFN_ALIGN(xen_start_info->nr_pages *
705 sizeof(unsigned long));
706 } else {
707 start = PFN_PHYS(xen_start_info->first_p2m_pfn);
708 size = PFN_PHYS(xen_start_info->nr_p2m_frames);
709 }
710
711 memblock_reserve(start, size);
712 if (!xen_is_e820_reserved(start, size))
713 return;
714
715#ifdef CONFIG_X86_32
716 /*
717 * Relocating the p2m on 32 bit system to an arbitrary virtual address
718 * is not supported, so just give up.
719 */
720 xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n");
721 BUG();
722#else
723 xen_relocate_p2m();
724 memblock_free(start, size);
725#endif
726}
727
728/**
729 * machine_specific_memory_setup - Hook for machine specific memory setup.
730 **/
731char * __init xen_memory_setup(void)
732{
733 unsigned long max_pfn, pfn_s, n_pfns;
734 phys_addr_t mem_end, addr, size, chunk_size;
735 u32 type;
736 int rc;
737 struct xen_memory_map memmap;
738 unsigned long max_pages;
739 unsigned long extra_pages = 0;
740 int i;
741 int op;
742
743 xen_parse_512gb();
744 max_pfn = xen_get_pages_limit();
745 max_pfn = min(max_pfn, xen_start_info->nr_pages);
746 mem_end = PFN_PHYS(max_pfn);
747
748 memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
749 set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
750
751 op = xen_initial_domain() ?
752 XENMEM_machine_memory_map :
753 XENMEM_memory_map;
754 rc = HYPERVISOR_memory_op(op, &memmap);
755 if (rc == -ENOSYS) {
756 BUG_ON(xen_initial_domain());
757 memmap.nr_entries = 1;
758 xen_e820_table.entries[0].addr = 0ULL;
759 xen_e820_table.entries[0].size = mem_end;
760 /* 8MB slack (to balance backend allocations). */
761 xen_e820_table.entries[0].size += 8ULL << 20;
762 xen_e820_table.entries[0].type = E820_TYPE_RAM;
763 rc = 0;
764 }
765 BUG_ON(rc);
766 BUG_ON(memmap.nr_entries == 0);
767 xen_e820_table.nr_entries = memmap.nr_entries;
768
769 /*
770 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
771 * regions, so if we're using the machine memory map leave the
772 * region as RAM as it is in the pseudo-physical map.
773 *
774 * UNUSABLE regions in domUs are not handled and will need
775 * a patch in the future.
776 */
777 if (xen_initial_domain())
778 xen_ignore_unusable();
779
780 /* Make sure the Xen-supplied memory map is well-ordered. */
781 e820__update_table(&xen_e820_table);
782
783 max_pages = xen_get_max_pages();
784
785 /* How many extra pages do we need due to remapping? */
786 max_pages += xen_foreach_remap_area(max_pfn, xen_count_remap_pages);
787
788 if (max_pages > max_pfn)
789 extra_pages += max_pages - max_pfn;
790
791 /*
792 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
793 * factor the base size. On non-highmem systems, the base
794 * size is the full initial memory allocation; on highmem it
795 * is limited to the max size of lowmem, so that it doesn't
796 * get completely filled.
797 *
798 * Make sure we have no memory above max_pages, as this area
799 * isn't handled by the p2m management.
800 *
801 * In principle there could be a problem in lowmem systems if
802 * the initial memory is also very large with respect to
803 * lowmem, but we won't try to deal with that here.
804 */
805 extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
806 extra_pages, max_pages - max_pfn);
807 i = 0;
808 addr = xen_e820_table.entries[0].addr;
809 size = xen_e820_table.entries[0].size;
810 while (i < xen_e820_table.nr_entries) {
811
812 chunk_size = size;
813 type = xen_e820_table.entries[i].type;
814
815 if (type == E820_TYPE_RAM) {
816 if (addr < mem_end) {
817 chunk_size = min(size, mem_end - addr);
818 } else if (extra_pages) {
819 chunk_size = min(size, PFN_PHYS(extra_pages));
820 pfn_s = PFN_UP(addr);
821 n_pfns = PFN_DOWN(addr + chunk_size) - pfn_s;
822 extra_pages -= n_pfns;
823 xen_add_extra_mem(pfn_s, n_pfns);
824 xen_max_p2m_pfn = pfn_s + n_pfns;
825 } else
826 type = E820_TYPE_UNUSABLE;
827 }
828
829 xen_align_and_add_e820_region(addr, chunk_size, type);
830
831 addr += chunk_size;
832 size -= chunk_size;
833 if (size == 0) {
834 i++;
835 if (i < xen_e820_table.nr_entries) {
836 addr = xen_e820_table.entries[i].addr;
837 size = xen_e820_table.entries[i].size;
838 }
839 }
840 }
841
842 /*
843 * Set the rest as identity mapped, in case PCI BARs are
844 * located here.
845 */
846 set_phys_range_identity(addr / PAGE_SIZE, ~0ul);
847
848 /*
849 * In domU, the ISA region is normal, usable memory, but we
850 * reserve ISA memory anyway because too many things poke
851 * about in there.
852 */
853 e820__range_add(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_TYPE_RESERVED);
854
855 e820__update_table(e820_table);
856
857 /*
858 * Check whether the kernel itself conflicts with the target E820 map.
859 * Failing now is better than running into weird problems later due
860 * to relocating (and even reusing) pages with kernel text or data.
861 */
862 if (xen_is_e820_reserved(__pa_symbol(_text),
863 __pa_symbol(__bss_stop) - __pa_symbol(_text))) {
864 xen_raw_console_write("Xen hypervisor allocated kernel memory conflicts with E820 map\n");
865 BUG();
866 }
867
868 /*
869 * Check for a conflict of the hypervisor supplied page tables with
870 * the target E820 map.
871 */
872 xen_pt_check_e820();
873
874 xen_reserve_xen_mfnlist();
875
876 /* Check for a conflict of the initrd with the target E820 map. */
877 if (xen_is_e820_reserved(boot_params.hdr.ramdisk_image,
878 boot_params.hdr.ramdisk_size)) {
879 phys_addr_t new_area, start, size;
880
881 new_area = xen_find_free_area(boot_params.hdr.ramdisk_size);
882 if (!new_area) {
883 xen_raw_console_write("Can't find new memory area for initrd needed due to E820 map conflict\n");
884 BUG();
885 }
886
887 start = boot_params.hdr.ramdisk_image;
888 size = boot_params.hdr.ramdisk_size;
889 xen_phys_memcpy(new_area, start, size);
890 pr_info("initrd moved from [mem %#010llx-%#010llx] to [mem %#010llx-%#010llx]\n",
891 start, start + size, new_area, new_area + size);
892 memblock_free(start, size);
893 boot_params.hdr.ramdisk_image = new_area;
894 boot_params.ext_ramdisk_image = new_area >> 32;
895 }
896
897 /*
898 * Set identity map on non-RAM pages and prepare remapping the
899 * underlying RAM.
900 */
901 xen_foreach_remap_area(max_pfn, xen_set_identity_and_remap_chunk);
902
903 pr_info("Released %ld page(s)\n", xen_released_pages);
904
905 return "Xen";
906}
907
908/*
909 * Machine specific memory setup for auto-translated guests.
910 */
911char * __init xen_auto_xlated_memory_setup(void)
912{
913 struct xen_memory_map memmap;
914 int i;
915 int rc;
916
917 memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
918 set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
919
920 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
921 if (rc < 0)
922 panic("No memory map (%d)\n", rc);
923
924 xen_e820_table.nr_entries = memmap.nr_entries;
925
926 e820__update_table(&xen_e820_table);
927
928 for (i = 0; i < xen_e820_table.nr_entries; i++)
929 e820__range_add(xen_e820_table.entries[i].addr, xen_e820_table.entries[i].size, xen_e820_table.entries[i].type);
930
931 /* Remove p2m info, it is not needed. */
932 xen_start_info->mfn_list = 0;
933 xen_start_info->first_p2m_pfn = 0;
934 xen_start_info->nr_p2m_frames = 0;
935
936 return "Xen";
937}
938
939/*
940 * Set the bit indicating "nosegneg" library variants should be used.
941 * We only need to bother in pure 32-bit mode; compat 32-bit processes
942 * can have un-truncated segments, so wrapping around is allowed.
943 */
944static void __init fiddle_vdso(void)
945{
946#ifdef CONFIG_X86_32
947 u32 *mask = vdso_image_32.data +
948 vdso_image_32.sym_VDSO32_NOTE_MASK;
949 *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
950#endif
951}
952
953static int register_callback(unsigned type, const void *func)
954{
955 struct callback_register callback = {
956 .type = type,
957 .address = XEN_CALLBACK(__KERNEL_CS, func),
958 .flags = CALLBACKF_mask_events,
959 };
960
961 return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
962}
963
964void xen_enable_sysenter(void)
965{
966 int ret;
967 unsigned sysenter_feature;
968
969#ifdef CONFIG_X86_32
970 sysenter_feature = X86_FEATURE_SEP;
971#else
972 sysenter_feature = X86_FEATURE_SYSENTER32;
973#endif
974
975 if (!boot_cpu_has(sysenter_feature))
976 return;
977
978 ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
979 if(ret != 0)
980 setup_clear_cpu_cap(sysenter_feature);
981}
982
983void xen_enable_syscall(void)
984{
985#ifdef CONFIG_X86_64
986 int ret;
987
988 ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
989 if (ret != 0) {
990 printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
991 /* Pretty fatal; 64-bit userspace has no other
992 mechanism for syscalls. */
993 }
994
995 if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
996 ret = register_callback(CALLBACKTYPE_syscall32,
997 xen_syscall32_target);
998 if (ret != 0)
999 setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
1000 }
1001#endif /* CONFIG_X86_64 */
1002}
1003
1004void __init xen_pvmmu_arch_setup(void)
1005{
1006 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
1007 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
1008
1009 HYPERVISOR_vm_assist(VMASST_CMD_enable,
1010 VMASST_TYPE_pae_extended_cr3);
1011
1012 if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
1013 register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
1014 BUG();
1015
1016 xen_enable_sysenter();
1017 xen_enable_syscall();
1018}
1019
1020/* This function is not called for HVM domains */
1021void __init xen_arch_setup(void)
1022{
1023 xen_panic_handler_init();
1024 xen_pvmmu_arch_setup();
1025
1026#ifdef CONFIG_ACPI
1027 if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
1028 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
1029 disable_acpi();
1030 }
1031#endif
1032
1033 memcpy(boot_command_line, xen_start_info->cmd_line,
1034 MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
1035 COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
1036
1037 /* Set up idle, making sure it calls safe_halt() pvop */
1038 disable_cpuidle();
1039 disable_cpufreq();
1040 WARN_ON(xen_set_default_idle());
1041 fiddle_vdso();
1042#ifdef CONFIG_NUMA
1043 numa_off = 1;
1044#endif
1045}