2 * Machine specific setup for xen
4 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
7 #include <linux/module.h>
8 #include <linux/sched.h>
11 #include <linux/memblock.h>
12 #include <linux/cpuidle.h>
13 #include <linux/cpufreq.h>
18 #include <asm/setup.h>
21 #include <asm/xen/hypervisor.h>
22 #include <asm/xen/hypercall.h>
26 #include <xen/interface/callback.h>
27 #include <xen/interface/memory.h>
28 #include <xen/interface/physdev.h>
29 #include <xen/features.h>
35 /* Amount of extra memory space we add to the e820 ranges */
36 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
38 /* Number of pages released from the initial allocation. */
39 unsigned long xen_released_pages;
42 * Buffer used to remap identity mapped pages. We only need the virtual space.
43 * The physical page behind this address is remapped as needed to different
46 #define REMAP_SIZE (P2M_PER_PAGE - 3)
48 unsigned long next_area_mfn;
49 unsigned long target_pfn;
51 unsigned long mfns[REMAP_SIZE];
52 } xen_remap_buf __initdata __aligned(PAGE_SIZE);
53 static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
56 * The maximum amount of extra memory compared to the base size. The
57 * main scaling factor is the size of struct page. At extreme ratios
58 * of base:extra, all the base memory can be filled with page
59 * structures for the extra memory, leaving no space for anything
62 * 10x seems like a reasonable balance between scaling flexibility and
63 * leaving a practically usable system.
65 #define EXTRA_MEM_RATIO (10)
67 static void __init xen_add_extra_mem(phys_addr_t start, phys_addr_t size)
71 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
73 if (xen_extra_mem[i].size == 0) {
74 xen_extra_mem[i].start = start;
75 xen_extra_mem[i].size = size;
78 /* Append to existing region. */
79 if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) {
80 xen_extra_mem[i].size += size;
84 if (i == XEN_EXTRA_MEM_MAX_REGIONS)
85 printk(KERN_WARNING "Warning: not enough extra memory regions\n");
87 memblock_reserve(start, size);
90 static void __init xen_del_extra_mem(phys_addr_t start, phys_addr_t size)
93 phys_addr_t start_r, size_r;
95 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
96 start_r = xen_extra_mem[i].start;
97 size_r = xen_extra_mem[i].size;
99 /* Start of region. */
100 if (start_r == start) {
101 BUG_ON(size > size_r);
102 xen_extra_mem[i].start += size;
103 xen_extra_mem[i].size -= size;
107 if (start_r + size_r == start + size) {
108 BUG_ON(size > size_r);
109 xen_extra_mem[i].size -= size;
113 if (start > start_r && start < start_r + size_r) {
114 BUG_ON(start + size > start_r + size_r);
115 xen_extra_mem[i].size = start - start_r;
116 /* Calling memblock_reserve() again is okay. */
117 xen_add_extra_mem(start + size, start_r + size_r -
122 memblock_free(start, size);
126 * Called during boot before the p2m list can take entries beyond the
127 * hypervisor supplied p2m list. Entries in extra mem are to be regarded as
130 unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
133 phys_addr_t addr = PFN_PHYS(pfn);
135 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
136 if (addr >= xen_extra_mem[i].start &&
137 addr < xen_extra_mem[i].start + xen_extra_mem[i].size)
138 return INVALID_P2M_ENTRY;
141 return IDENTITY_FRAME(pfn);
145 * Mark all pfns of extra mem as invalid in p2m list.
147 void __init xen_inv_extra_mem(void)
149 unsigned long pfn, pfn_s, pfn_e;
152 for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
153 if (!xen_extra_mem[i].size)
155 pfn_s = PFN_DOWN(xen_extra_mem[i].start);
156 pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
157 for (pfn = pfn_s; pfn < pfn_e; pfn++)
158 set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
163 * Finds the next RAM pfn available in the E820 map after min_pfn.
164 * This function updates min_pfn with the pfn found and returns
165 * the size of that range or zero if not found.
167 static unsigned long __init xen_find_pfn_range(
168 const struct e820entry *list, size_t map_size,
169 unsigned long *min_pfn)
171 const struct e820entry *entry;
173 unsigned long done = 0;
175 for (i = 0, entry = list; i < map_size; i++, entry++) {
179 if (entry->type != E820_RAM)
182 e_pfn = PFN_DOWN(entry->addr + entry->size);
184 /* We only care about E820 after this */
185 if (e_pfn < *min_pfn)
188 s_pfn = PFN_UP(entry->addr);
190 /* If min_pfn falls within the E820 entry, we want to start
191 * at the min_pfn PFN.
193 if (s_pfn <= *min_pfn) {
194 done = e_pfn - *min_pfn;
196 done = e_pfn - s_pfn;
205 static int __init xen_free_mfn(unsigned long mfn)
207 struct xen_memory_reservation reservation = {
213 set_xen_guest_handle(reservation.extent_start, &mfn);
214 reservation.nr_extents = 1;
216 return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
220 * This releases a chunk of memory and then does the identity map. It's used
221 * as a fallback if the remapping fails.
223 static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
224 unsigned long end_pfn, unsigned long nr_pages, unsigned long *released)
226 unsigned long pfn, end;
229 WARN_ON(start_pfn > end_pfn);
231 /* Release pages first. */
232 end = min(end_pfn, nr_pages);
233 for (pfn = start_pfn; pfn < end; pfn++) {
234 unsigned long mfn = pfn_to_mfn(pfn);
236 /* Make sure pfn exists to start with */
237 if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
240 ret = xen_free_mfn(mfn);
241 WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
245 if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
251 set_phys_range_identity(start_pfn, end_pfn);
255 * Helper function to update the p2m and m2p tables and kernel mapping.
257 static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn)
259 struct mmu_update update = {
260 .ptr = ((uint64_t)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE,
265 if (!set_phys_to_machine(pfn, mfn)) {
266 WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n",
272 if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) {
273 WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n",
278 /* Update kernel mapping, but not for highmem. */
279 if (pfn >= PFN_UP(__pa(high_memory - 1)))
282 if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
283 mfn_pte(mfn, PAGE_KERNEL), 0)) {
284 WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",
291 * This function updates the p2m and m2p tables with an identity map from
292 * start_pfn to start_pfn+size and prepares remapping the underlying RAM of the
293 * original allocation at remap_pfn. The information needed for remapping is
294 * saved in the memory itself to avoid the need for allocating buffers. The
295 * complete remap information is contained in a list of MFNs each containing
296 * up to REMAP_SIZE MFNs and the start target PFN for doing the remap.
297 * This enables us to preserve the original mfn sequence while doing the
298 * remapping at a time when the memory management is capable of allocating
299 * virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and
302 static void __init xen_do_set_identity_and_remap_chunk(
303 unsigned long start_pfn, unsigned long size, unsigned long remap_pfn)
305 unsigned long buf = (unsigned long)&xen_remap_buf;
306 unsigned long mfn_save, mfn;
307 unsigned long ident_pfn_iter, remap_pfn_iter;
308 unsigned long ident_end_pfn = start_pfn + size;
309 unsigned long left = size;
310 unsigned int i, chunk;
314 BUG_ON(xen_feature(XENFEAT_auto_translated_physmap));
316 mfn_save = virt_to_mfn(buf);
318 for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
319 ident_pfn_iter < ident_end_pfn;
320 ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) {
321 chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE;
323 /* Map first pfn to xen_remap_buf */
324 mfn = pfn_to_mfn(ident_pfn_iter);
325 set_pte_mfn(buf, mfn, PAGE_KERNEL);
327 /* Save mapping information in page */
328 xen_remap_buf.next_area_mfn = xen_remap_mfn;
329 xen_remap_buf.target_pfn = remap_pfn_iter;
330 xen_remap_buf.size = chunk;
331 for (i = 0; i < chunk; i++)
332 xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i);
334 /* Put remap buf into list. */
337 /* Set identity map */
338 set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);
343 /* Restore old xen_remap_buf mapping */
344 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
348 * This function takes a contiguous pfn range that needs to be identity mapped
351 * 1) Finds a new range of pfns to use to remap based on E820 and remap_pfn.
352 * 2) Calls the do_ function to actually do the mapping/remapping work.
354 * The goal is to not allocate additional memory but to remap the existing
355 * pages. In the case of an error the underlying memory is simply released back
356 * to Xen and not remapped.
358 static unsigned long __init xen_set_identity_and_remap_chunk(
359 const struct e820entry *list, size_t map_size, unsigned long start_pfn,
360 unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
361 unsigned long *released, unsigned long *remapped)
365 unsigned long n = end_pfn - start_pfn;
368 unsigned long cur_pfn = start_pfn + i;
369 unsigned long left = n - i;
370 unsigned long size = left;
371 unsigned long remap_range_size;
373 /* Do not remap pages beyond the current allocation */
374 if (cur_pfn >= nr_pages) {
375 /* Identity map remaining pages */
376 set_phys_range_identity(cur_pfn, cur_pfn + size);
379 if (cur_pfn + size > nr_pages)
380 size = nr_pages - cur_pfn;
382 remap_range_size = xen_find_pfn_range(list, map_size,
384 if (!remap_range_size) {
385 pr_warning("Unable to find available pfn range, not remapping identity pages\n");
386 xen_set_identity_and_release_chunk(cur_pfn,
387 cur_pfn + left, nr_pages, released);
390 /* Adjust size to fit in current e820 RAM region */
391 if (size > remap_range_size)
392 size = remap_range_size;
394 xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn);
396 /* Update variables to reflect new mappings. */
403 * If the PFNs are currently mapped, the VA mapping also needs
404 * to be updated to be 1:1.
406 for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++)
407 (void)HYPERVISOR_update_va_mapping(
408 (unsigned long)__va(pfn << PAGE_SHIFT),
409 mfn_pte(pfn, PAGE_KERNEL_IO), 0);
414 static void __init xen_set_identity_and_remap(
415 const struct e820entry *list, size_t map_size, unsigned long nr_pages,
416 unsigned long *released, unsigned long *remapped)
418 phys_addr_t start = 0;
419 unsigned long last_pfn = nr_pages;
420 const struct e820entry *entry;
421 unsigned long num_released = 0;
422 unsigned long num_remapped = 0;
426 * Combine non-RAM regions and gaps until a RAM region (or the
427 * end of the map) is reached, then set the 1:1 map and
428 * remap the memory in those non-RAM regions.
430 * The combined non-RAM regions are rounded to a whole number
431 * of pages so any partial pages are accessible via the 1:1
432 * mapping. This is needed for some BIOSes that put (for
433 * example) the DMI tables in a reserved region that begins on
434 * a non-page boundary.
436 for (i = 0, entry = list; i < map_size; i++, entry++) {
437 phys_addr_t end = entry->addr + entry->size;
438 if (entry->type == E820_RAM || i == map_size - 1) {
439 unsigned long start_pfn = PFN_DOWN(start);
440 unsigned long end_pfn = PFN_UP(end);
442 if (entry->type == E820_RAM)
443 end_pfn = PFN_UP(entry->addr);
445 if (start_pfn < end_pfn)
446 last_pfn = xen_set_identity_and_remap_chunk(
447 list, map_size, start_pfn,
448 end_pfn, nr_pages, last_pfn,
449 &num_released, &num_remapped);
454 *released = num_released;
455 *remapped = num_remapped;
457 pr_info("Released %ld page(s)\n", num_released);
461 * Remap the memory prepared in xen_do_set_identity_and_remap_chunk().
462 * The remap information (which mfn remap to which pfn) is contained in the
463 * to be remapped memory itself in a linked list anchored at xen_remap_mfn.
464 * This scheme allows to remap the different chunks in arbitrary order while
465 * the resulting mapping will be independant from the order.
467 void __init xen_remap_memory(void)
469 unsigned long buf = (unsigned long)&xen_remap_buf;
470 unsigned long mfn_save, mfn, pfn;
471 unsigned long remapped = 0;
473 unsigned long pfn_s = ~0UL;
474 unsigned long len = 0;
476 mfn_save = virt_to_mfn(buf);
478 while (xen_remap_mfn != INVALID_P2M_ENTRY) {
479 /* Map the remap information */
480 set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL);
482 BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]);
484 pfn = xen_remap_buf.target_pfn;
485 for (i = 0; i < xen_remap_buf.size; i++) {
486 mfn = xen_remap_buf.mfns[i];
487 xen_update_mem_tables(pfn, mfn);
491 if (pfn_s == ~0UL || pfn == pfn_s) {
492 pfn_s = xen_remap_buf.target_pfn;
493 len += xen_remap_buf.size;
494 } else if (pfn_s + len == xen_remap_buf.target_pfn) {
495 len += xen_remap_buf.size;
497 xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
498 pfn_s = xen_remap_buf.target_pfn;
499 len = xen_remap_buf.size;
503 xen_remap_mfn = xen_remap_buf.next_area_mfn;
506 if (pfn_s != ~0UL && len)
507 xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
509 set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
511 pr_info("Remapped %ld page(s)\n", remapped);
514 static unsigned long __init xen_get_max_pages(void)
516 unsigned long max_pages = MAX_DOMAIN_PAGES;
517 domid_t domid = DOMID_SELF;
521 * For the initial domain we use the maximum reservation as
524 * For guest domains the current maximum reservation reflects
525 * the current maximum rather than the static maximum. In this
526 * case the e820 map provided to us will cover the static
529 if (xen_initial_domain()) {
530 ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
535 return min(max_pages, MAX_DOMAIN_PAGES);
538 static void __init xen_align_and_add_e820_region(phys_addr_t start,
539 phys_addr_t size, int type)
541 phys_addr_t end = start + size;
543 /* Align RAM regions to page boundaries. */
544 if (type == E820_RAM) {
545 start = PAGE_ALIGN(start);
546 end &= ~((phys_addr_t)PAGE_SIZE - 1);
549 e820_add_region(start, end - start, type);
552 static void __init xen_ignore_unusable(struct e820entry *list, size_t map_size)
554 struct e820entry *entry;
557 for (i = 0, entry = list; i < map_size; i++, entry++) {
558 if (entry->type == E820_UNUSABLE)
559 entry->type = E820_RAM;
564 * Reserve Xen mfn_list.
565 * See comment above "struct start_info" in <xen/interface/xen.h>
566 * We tried to make the the memblock_reserve more selective so
567 * that it would be clear what region is reserved. Sadly we ran
568 * in the problem wherein on a 64-bit hypervisor with a 32-bit
569 * initial domain, the pt_base has the cr3 value which is not
570 * neccessarily where the pagetable starts! As Jan put it: "
571 * Actually, the adjustment turns out to be correct: The page
572 * tables for a 32-on-64 dom0 get allocated in the order "first L1",
573 * "first L2", "first L3", so the offset to the page table base is
574 * indeed 2. When reading xen/include/public/xen.h's comment
575 * very strictly, this is not a violation (since there nothing is said
576 * that the first thing in the page table space is pointed to by
577 * pt_base; I admit that this seems to be implied though, namely
578 * do I think that it is implied that the page table space is the
579 * range [pt_base, pt_base + nt_pt_frames), whereas that
580 * range here indeed is [pt_base - 2, pt_base - 2 + nt_pt_frames),
581 * which - without a priori knowledge - the kernel would have
582 * difficulty to figure out)." - so lets just fall back to the
583 * easy way and reserve the whole region.
585 static void __init xen_reserve_xen_mfnlist(void)
587 if (xen_start_info->mfn_list >= __START_KERNEL_map) {
588 memblock_reserve(__pa(xen_start_info->mfn_list),
589 xen_start_info->pt_base -
590 xen_start_info->mfn_list);
594 memblock_reserve(PFN_PHYS(xen_start_info->first_p2m_pfn),
595 PFN_PHYS(xen_start_info->nr_p2m_frames));
599 * machine_specific_memory_setup - Hook for machine specific memory setup.
601 char * __init xen_memory_setup(void)
603 static struct e820entry map[E820MAX] __initdata;
605 unsigned long max_pfn = xen_start_info->nr_pages;
608 struct xen_memory_map memmap;
609 unsigned long max_pages;
610 unsigned long extra_pages = 0;
611 unsigned long remapped_pages;
615 max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
616 mem_end = PFN_PHYS(max_pfn);
618 memmap.nr_entries = E820MAX;
619 set_xen_guest_handle(memmap.buffer, map);
621 op = xen_initial_domain() ?
622 XENMEM_machine_memory_map :
624 rc = HYPERVISOR_memory_op(op, &memmap);
626 BUG_ON(xen_initial_domain());
627 memmap.nr_entries = 1;
629 map[0].size = mem_end;
630 /* 8MB slack (to balance backend allocations). */
631 map[0].size += 8ULL << 20;
632 map[0].type = E820_RAM;
636 BUG_ON(memmap.nr_entries == 0);
639 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
640 * regions, so if we're using the machine memory map leave the
641 * region as RAM as it is in the pseudo-physical map.
643 * UNUSABLE regions in domUs are not handled and will need
644 * a patch in the future.
646 if (xen_initial_domain())
647 xen_ignore_unusable(map, memmap.nr_entries);
649 /* Make sure the Xen-supplied memory map is well-ordered. */
650 sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries);
652 max_pages = xen_get_max_pages();
653 if (max_pages > max_pfn)
654 extra_pages += max_pages - max_pfn;
657 * Set identity map on non-RAM pages and prepare remapping the
660 xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
661 &xen_released_pages, &remapped_pages);
663 extra_pages += xen_released_pages;
664 extra_pages += remapped_pages;
667 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
668 * factor the base size. On non-highmem systems, the base
669 * size is the full initial memory allocation; on highmem it
670 * is limited to the max size of lowmem, so that it doesn't
671 * get completely filled.
673 * In principle there could be a problem in lowmem systems if
674 * the initial memory is also very large with respect to
675 * lowmem, but we won't try to deal with that here.
677 extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
680 while (i < memmap.nr_entries) {
681 phys_addr_t addr = map[i].addr;
682 phys_addr_t size = map[i].size;
683 u32 type = map[i].type;
685 if (type == E820_RAM) {
686 if (addr < mem_end) {
687 size = min(size, mem_end - addr);
688 } else if (extra_pages) {
689 size = min(size, PFN_PHYS(extra_pages));
690 extra_pages -= PFN_DOWN(size);
691 xen_add_extra_mem(addr, size);
692 xen_max_p2m_pfn = PFN_DOWN(addr + size);
694 type = E820_UNUSABLE;
697 xen_align_and_add_e820_region(addr, size, type);
701 if (map[i].size == 0)
706 * Set the rest as identity mapped, in case PCI BARs are
709 * PFNs above MAX_P2M_PFN are considered identity mapped as
712 set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul);
715 * In domU, the ISA region is normal, usable memory, but we
716 * reserve ISA memory anyway because too many things poke
719 e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
722 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
724 xen_reserve_xen_mfnlist();
730 * Machine specific memory setup for auto-translated guests.
732 char * __init xen_auto_xlated_memory_setup(void)
734 static struct e820entry map[E820MAX] __initdata;
736 struct xen_memory_map memmap;
740 memmap.nr_entries = E820MAX;
741 set_xen_guest_handle(memmap.buffer, map);
743 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
745 panic("No memory map (%d)\n", rc);
747 sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries);
749 for (i = 0; i < memmap.nr_entries; i++)
750 e820_add_region(map[i].addr, map[i].size, map[i].type);
752 xen_reserve_xen_mfnlist();
758 * Set the bit indicating "nosegneg" library variants should be used.
759 * We only need to bother in pure 32-bit mode; compat 32-bit processes
760 * can have un-truncated segments, so wrapping around is allowed.
762 static void __init fiddle_vdso(void)
766 * This could be called before selected_vdso32 is initialized, so
767 * just fiddle with both possible images. vdso_image_32_syscall
768 * can't be selected, since it only exists on 64-bit systems.
771 mask = vdso_image_32_int80.data +
772 vdso_image_32_int80.sym_VDSO32_NOTE_MASK;
773 *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
774 mask = vdso_image_32_sysenter.data +
775 vdso_image_32_sysenter.sym_VDSO32_NOTE_MASK;
776 *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
780 static int register_callback(unsigned type, const void *func)
782 struct callback_register callback = {
784 .address = XEN_CALLBACK(__KERNEL_CS, func),
785 .flags = CALLBACKF_mask_events,
788 return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
791 void xen_enable_sysenter(void)
794 unsigned sysenter_feature;
797 sysenter_feature = X86_FEATURE_SEP;
799 sysenter_feature = X86_FEATURE_SYSENTER32;
802 if (!boot_cpu_has(sysenter_feature))
805 ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
807 setup_clear_cpu_cap(sysenter_feature);
810 void xen_enable_syscall(void)
815 ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
817 printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
818 /* Pretty fatal; 64-bit userspace has no other
819 mechanism for syscalls. */
822 if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
823 ret = register_callback(CALLBACKTYPE_syscall32,
824 xen_syscall32_target);
826 setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
828 #endif /* CONFIG_X86_64 */
831 void __init xen_pvmmu_arch_setup(void)
833 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
834 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
836 HYPERVISOR_vm_assist(VMASST_CMD_enable,
837 VMASST_TYPE_pae_extended_cr3);
839 if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
840 register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
843 xen_enable_sysenter();
844 xen_enable_syscall();
847 /* This function is not called for HVM domains */
848 void __init xen_arch_setup(void)
850 xen_panic_handler_init();
851 if (!xen_feature(XENFEAT_auto_translated_physmap))
852 xen_pvmmu_arch_setup();
855 if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
856 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
861 memcpy(boot_command_line, xen_start_info->cmd_line,
862 MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
863 COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
865 /* Set up idle, making sure it calls safe_halt() pvop */
868 WARN_ON(xen_set_default_idle());