4 * This file contains the various mmu fetch and update operations.
5 * The most important job they must perform is the mapping between the
6 * domain's pfn and the overall machine mfns.
8 * Xen allows guests to directly update the pagetable, in a controlled
9 * fashion. In other words, the guest modifies the same pagetable
10 * that the CPU actually uses, which eliminates the overhead of having
11 * a separate shadow pagetable.
13 * In order to allow this, it falls on the guest domain to map its
14 * notion of a "physical" pfn - which is just a domain-local linear
15 * address - into a real "machine address" which the CPU's MMU can
18 * A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
19 * inserted directly into the pagetable. When creating a new
20 * pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
21 * when reading the content back with __(pgd|pmd|pte)_val, it converts
22 * the mfn back into a pfn.
24 * The other constraint is that all pages which make up a pagetable
25 * must be mapped read-only in the guest. This prevents uncontrolled
26 * guest updates to the pagetable. Xen strictly enforces this, and
27 * will disallow any pagetable update which will end up mapping a
28 * pagetable page RW, and will disallow using any writable page as a
31 * Naively, when loading %cr3 with the base of a new pagetable, Xen
32 * would need to validate the whole pagetable before going on.
33 * Naturally, this is quite slow. The solution is to "pin" a
34 * pagetable, which enforces all the constraints on the pagetable even
35 * when it is not actively in use. This menas that Xen can be assured
36 * that it is still valid when you do load it into %cr3, and doesn't
37 * need to revalidate it.
39 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
41 #include <linux/sched.h>
42 #include <linux/highmem.h>
43 #include <linux/debugfs.h>
44 #include <linux/bug.h>
45 #include <linux/vmalloc.h>
46 #include <linux/module.h>
47 #include <linux/gfp.h>
48 #include <linux/memblock.h>
49 #include <linux/seq_file.h>
51 #include <asm/pgtable.h>
52 #include <asm/tlbflush.h>
53 #include <asm/fixmap.h>
54 #include <asm/mmu_context.h>
55 #include <asm/setup.h>
56 #include <asm/paravirt.h>
58 #include <asm/linkage.h>
63 #include <asm/xen/hypercall.h>
64 #include <asm/xen/hypervisor.h>
68 #include <xen/interface/xen.h>
69 #include <xen/interface/hvm/hvm_op.h>
70 #include <xen/interface/version.h>
71 #include <xen/interface/memory.h>
72 #include <xen/hvc-console.h>
74 #include "multicalls.h"
78 #define MMU_UPDATE_HISTO 30
81 * Protects atomic reservation decrease/increase against concurrent increases.
82 * Also protects non-atomic updates of current_pages and driver_pages, and
85 DEFINE_SPINLOCK(xen_reservation_lock);
87 #ifdef CONFIG_XEN_DEBUG_FS
91 u32 pgd_update_pinned;
92 u32 pgd_update_batched;
95 u32 pud_update_pinned;
96 u32 pud_update_batched;
99 u32 pmd_update_pinned;
100 u32 pmd_update_batched;
103 u32 pte_update_pinned;
104 u32 pte_update_batched;
107 u32 mmu_update_extended;
108 u32 mmu_update_histo[MMU_UPDATE_HISTO];
111 u32 prot_commit_batched;
114 u32 set_pte_at_batched;
115 u32 set_pte_at_pinned;
116 u32 set_pte_at_current;
117 u32 set_pte_at_kernel;
120 static u8 zero_stats;
122 static inline void check_zero(void)
124 if (unlikely(zero_stats)) {
125 memset(&mmu_stats, 0, sizeof(mmu_stats));
130 #define ADD_STATS(elem, val) \
131 do { check_zero(); mmu_stats.elem += (val); } while(0)
133 #else /* !CONFIG_XEN_DEBUG_FS */
135 #define ADD_STATS(elem, val) do { (void)(val); } while(0)
137 #endif /* CONFIG_XEN_DEBUG_FS */
141 * Identity map, in addition to plain kernel map. This needs to be
142 * large enough to allocate page table pages to allocate the rest.
143 * Each page can map 2MB.
145 #define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
146 static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
149 /* l3 pud for userspace vsyscall mapping */
150 static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
151 #endif /* CONFIG_X86_64 */
154 * Note about cr3 (pagetable base) values:
156 * xen_cr3 contains the current logical cr3 value; it contains the
157 * last set cr3. This may not be the current effective cr3, because
158 * its update may be being lazily deferred. However, a vcpu looking
159 * at its own cr3 can use this value knowing that it everything will
160 * be self-consistent.
162 * xen_current_cr3 contains the actual vcpu cr3; it is set once the
163 * hypercall to set the vcpu cr3 is complete (so it may be a little
164 * out of date, but it will never be set early). If one vcpu is
165 * looking at another vcpu's cr3 value, it should use this variable.
167 DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
168 DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
172 * Just beyond the highest usermode address. STACK_TOP_MAX has a
173 * redzone above it, so round it up to a PGD boundary.
175 #define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
177 unsigned long arbitrary_virt_to_mfn(void *vaddr)
179 xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
181 return PFN_DOWN(maddr.maddr);
184 xmaddr_t arbitrary_virt_to_machine(void *vaddr)
186 unsigned long address = (unsigned long)vaddr;
192 * if the PFN is in the linear mapped vaddr range, we can just use
193 * the (quick) virt_to_machine() p2m lookup
195 if (virt_addr_valid(vaddr))
196 return virt_to_machine(vaddr);
198 /* otherwise we have to do a (slower) full page-table walk */
200 pte = lookup_address(address, &level);
202 offset = address & ~PAGE_MASK;
203 return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
205 EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
207 void make_lowmem_page_readonly(void *vaddr)
210 unsigned long address = (unsigned long)vaddr;
213 pte = lookup_address(address, &level);
215 return; /* vaddr missing */
217 ptev = pte_wrprotect(*pte);
219 if (HYPERVISOR_update_va_mapping(address, ptev, 0))
223 void make_lowmem_page_readwrite(void *vaddr)
226 unsigned long address = (unsigned long)vaddr;
229 pte = lookup_address(address, &level);
231 return; /* vaddr missing */
233 ptev = pte_mkwrite(*pte);
235 if (HYPERVISOR_update_va_mapping(address, ptev, 0))
240 static bool xen_page_pinned(void *ptr)
242 struct page *page = virt_to_page(ptr);
244 return PagePinned(page);
247 static bool xen_iomap_pte(pte_t pte)
249 return pte_flags(pte) & _PAGE_IOMAP;
252 void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
254 struct multicall_space mcs;
255 struct mmu_update *u;
257 mcs = xen_mc_entry(sizeof(*u));
260 /* ptep might be kmapped when using 32-bit HIGHPTE */
261 u->ptr = arbitrary_virt_to_machine(ptep).maddr;
262 u->val = pte_val_ma(pteval);
264 MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
266 xen_mc_issue(PARAVIRT_LAZY_MMU);
268 EXPORT_SYMBOL_GPL(xen_set_domain_pte);
270 static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
272 xen_set_domain_pte(ptep, pteval, DOMID_IO);
275 static void xen_extend_mmu_update(const struct mmu_update *update)
277 struct multicall_space mcs;
278 struct mmu_update *u;
280 mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
282 if (mcs.mc != NULL) {
283 ADD_STATS(mmu_update_extended, 1);
284 ADD_STATS(mmu_update_histo[mcs.mc->args[1]], -1);
288 if (mcs.mc->args[1] < MMU_UPDATE_HISTO)
289 ADD_STATS(mmu_update_histo[mcs.mc->args[1]], 1);
291 ADD_STATS(mmu_update_histo[0], 1);
293 ADD_STATS(mmu_update, 1);
294 mcs = __xen_mc_entry(sizeof(*u));
295 MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
296 ADD_STATS(mmu_update_histo[1], 1);
303 void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
311 /* ptr may be ioremapped for 64-bit pagetable setup */
312 u.ptr = arbitrary_virt_to_machine(ptr).maddr;
313 u.val = pmd_val_ma(val);
314 xen_extend_mmu_update(&u);
316 ADD_STATS(pmd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
318 xen_mc_issue(PARAVIRT_LAZY_MMU);
323 void xen_set_pmd(pmd_t *ptr, pmd_t val)
325 ADD_STATS(pmd_update, 1);
327 /* If page is not pinned, we can just update the entry
329 if (!xen_page_pinned(ptr)) {
334 ADD_STATS(pmd_update_pinned, 1);
336 xen_set_pmd_hyper(ptr, val);
340 * Associate a virtual page frame with a given physical page frame
341 * and protection flags for that frame.
343 void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
345 set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
348 void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
349 pte_t *ptep, pte_t pteval)
351 if (xen_iomap_pte(pteval)) {
352 xen_set_iomap_pte(ptep, pteval);
356 ADD_STATS(set_pte_at, 1);
357 // ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
358 ADD_STATS(set_pte_at_current, mm == current->mm);
359 ADD_STATS(set_pte_at_kernel, mm == &init_mm);
361 if (mm == current->mm || mm == &init_mm) {
362 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
363 struct multicall_space mcs;
364 mcs = xen_mc_entry(0);
366 MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
367 ADD_STATS(set_pte_at_batched, 1);
368 xen_mc_issue(PARAVIRT_LAZY_MMU);
371 if (HYPERVISOR_update_va_mapping(addr, pteval, 0) == 0)
374 xen_set_pte(ptep, pteval);
379 pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
380 unsigned long addr, pte_t *ptep)
382 /* Just return the pte as-is. We preserve the bits on commit */
386 void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
387 pte_t *ptep, pte_t pte)
393 u.ptr = arbitrary_virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
394 u.val = pte_val_ma(pte);
395 xen_extend_mmu_update(&u);
397 ADD_STATS(prot_commit, 1);
398 ADD_STATS(prot_commit_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
400 xen_mc_issue(PARAVIRT_LAZY_MMU);
403 /* Assume pteval_t is equivalent to all the other *val_t types. */
404 static pteval_t pte_mfn_to_pfn(pteval_t val)
406 if (val & _PAGE_PRESENT) {
407 unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
408 pteval_t flags = val & PTE_FLAGS_MASK;
409 val = ((pteval_t)mfn_to_pfn(mfn) << PAGE_SHIFT) | flags;
415 static pteval_t pte_pfn_to_mfn(pteval_t val)
417 if (val & _PAGE_PRESENT) {
418 unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
419 pteval_t flags = val & PTE_FLAGS_MASK;
422 if (!xen_feature(XENFEAT_auto_translated_physmap))
423 mfn = get_phys_to_machine(pfn);
427 * If there's no mfn for the pfn, then just create an
428 * empty non-present pte. Unfortunately this loses
429 * information about the original pfn, so
430 * pte_mfn_to_pfn is asymmetric.
432 if (unlikely(mfn == INVALID_P2M_ENTRY)) {
437 * Paramount to do this test _after_ the
438 * INVALID_P2M_ENTRY as INVALID_P2M_ENTRY &
439 * IDENTITY_FRAME_BIT resolves to true.
441 mfn &= ~FOREIGN_FRAME_BIT;
442 if (mfn & IDENTITY_FRAME_BIT) {
443 mfn &= ~IDENTITY_FRAME_BIT;
444 flags |= _PAGE_IOMAP;
447 val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
453 static pteval_t iomap_pte(pteval_t val)
455 if (val & _PAGE_PRESENT) {
456 unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
457 pteval_t flags = val & PTE_FLAGS_MASK;
459 /* We assume the pte frame number is a MFN, so
460 just use it as-is. */
461 val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
467 pteval_t xen_pte_val(pte_t pte)
469 pteval_t pteval = pte.pte;
471 /* If this is a WC pte, convert back from Xen WC to Linux WC */
472 if ((pteval & (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)) == _PAGE_PAT) {
473 WARN_ON(!pat_enabled);
474 pteval = (pteval & ~_PAGE_PAT) | _PAGE_PWT;
477 if (xen_initial_domain() && (pteval & _PAGE_IOMAP))
480 return pte_mfn_to_pfn(pteval);
482 PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
484 pgdval_t xen_pgd_val(pgd_t pgd)
486 return pte_mfn_to_pfn(pgd.pgd);
488 PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
491 * Xen's PAT setup is part of its ABI, though I assume entries 6 & 7
492 * are reserved for now, to correspond to the Intel-reserved PAT
495 * We expect Linux's PAT set as follows:
497 * Idx PTE flags Linux Xen Default
504 * 6 PAT PCD UC- UC UC-
505 * 7 PAT PCD PWT UC UC UC
508 void xen_set_pat(u64 pat)
510 /* We expect Linux to use a PAT setting of
511 * UC UC- WC WB (ignoring the PAT flag) */
512 WARN_ON(pat != 0x0007010600070106ull);
515 pte_t xen_make_pte(pteval_t pte)
517 phys_addr_t addr = (pte & PTE_PFN_MASK);
519 /* If Linux is trying to set a WC pte, then map to the Xen WC.
520 * If _PAGE_PAT is set, then it probably means it is really
521 * _PAGE_PSE, so avoid fiddling with the PAT mapping and hope
522 * things work out OK...
524 * (We should never see kernel mappings with _PAGE_PSE set,
525 * but we could see hugetlbfs mappings, I think.).
527 if (pat_enabled && !WARN_ON(pte & _PAGE_PAT)) {
528 if ((pte & (_PAGE_PCD | _PAGE_PWT)) == _PAGE_PWT)
529 pte = (pte & ~(_PAGE_PCD | _PAGE_PWT)) | _PAGE_PAT;
533 * Unprivileged domains are allowed to do IOMAPpings for
534 * PCI passthrough, but not map ISA space. The ISA
535 * mappings are just dummy local mappings to keep other
536 * parts of the kernel happy.
538 if (unlikely(pte & _PAGE_IOMAP) &&
539 (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
540 pte = iomap_pte(pte);
543 pte = pte_pfn_to_mfn(pte);
546 return native_make_pte(pte);
548 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
550 #ifdef CONFIG_XEN_DEBUG
551 pte_t xen_make_pte_debug(pteval_t pte)
553 phys_addr_t addr = (pte & PTE_PFN_MASK);
554 phys_addr_t other_addr;
555 bool io_page = false;
558 if (pte & _PAGE_IOMAP)
561 _pte = xen_make_pte(pte);
567 (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
568 other_addr = pfn_to_mfn(addr >> PAGE_SHIFT) << PAGE_SHIFT;
569 WARN(addr != other_addr,
570 "0x%lx is using VM_IO, but it is 0x%lx!\n",
571 (unsigned long)addr, (unsigned long)other_addr);
573 pteval_t iomap_set = (_pte.pte & PTE_FLAGS_MASK) & _PAGE_IOMAP;
574 other_addr = (_pte.pte & PTE_PFN_MASK);
575 WARN((addr == other_addr) && (!io_page) && (!iomap_set),
576 "0x%lx is missing VM_IO (and wasn't fixed)!\n",
577 (unsigned long)addr);
582 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_debug);
585 pgd_t xen_make_pgd(pgdval_t pgd)
587 pgd = pte_pfn_to_mfn(pgd);
588 return native_make_pgd(pgd);
590 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
592 pmdval_t xen_pmd_val(pmd_t pmd)
594 return pte_mfn_to_pfn(pmd.pmd);
596 PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
598 void xen_set_pud_hyper(pud_t *ptr, pud_t val)
606 /* ptr may be ioremapped for 64-bit pagetable setup */
607 u.ptr = arbitrary_virt_to_machine(ptr).maddr;
608 u.val = pud_val_ma(val);
609 xen_extend_mmu_update(&u);
611 ADD_STATS(pud_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
613 xen_mc_issue(PARAVIRT_LAZY_MMU);
618 void xen_set_pud(pud_t *ptr, pud_t val)
620 ADD_STATS(pud_update, 1);
622 /* If page is not pinned, we can just update the entry
624 if (!xen_page_pinned(ptr)) {
629 ADD_STATS(pud_update_pinned, 1);
631 xen_set_pud_hyper(ptr, val);
634 void xen_set_pte(pte_t *ptep, pte_t pte)
636 if (xen_iomap_pte(pte)) {
637 xen_set_iomap_pte(ptep, pte);
641 ADD_STATS(pte_update, 1);
642 // ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
643 ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
645 #ifdef CONFIG_X86_PAE
646 ptep->pte_high = pte.pte_high;
648 ptep->pte_low = pte.pte_low;
654 #ifdef CONFIG_X86_PAE
655 void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
657 if (xen_iomap_pte(pte)) {
658 xen_set_iomap_pte(ptep, pte);
662 set_64bit((u64 *)ptep, native_pte_val(pte));
665 void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
668 smp_wmb(); /* make sure low gets written first */
672 void xen_pmd_clear(pmd_t *pmdp)
674 set_pmd(pmdp, __pmd(0));
676 #endif /* CONFIG_X86_PAE */
678 pmd_t xen_make_pmd(pmdval_t pmd)
680 pmd = pte_pfn_to_mfn(pmd);
681 return native_make_pmd(pmd);
683 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
685 #if PAGETABLE_LEVELS == 4
686 pudval_t xen_pud_val(pud_t pud)
688 return pte_mfn_to_pfn(pud.pud);
690 PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
692 pud_t xen_make_pud(pudval_t pud)
694 pud = pte_pfn_to_mfn(pud);
696 return native_make_pud(pud);
698 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
700 pgd_t *xen_get_user_pgd(pgd_t *pgd)
702 pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
703 unsigned offset = pgd - pgd_page;
704 pgd_t *user_ptr = NULL;
706 if (offset < pgd_index(USER_LIMIT)) {
707 struct page *page = virt_to_page(pgd_page);
708 user_ptr = (pgd_t *)page->private;
716 static void __xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
720 u.ptr = virt_to_machine(ptr).maddr;
721 u.val = pgd_val_ma(val);
722 xen_extend_mmu_update(&u);
726 * Raw hypercall-based set_pgd, intended for in early boot before
727 * there's a page structure. This implies:
728 * 1. The only existing pagetable is the kernel's
729 * 2. It is always pinned
730 * 3. It has no user pagetable attached to it
732 void __init xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
738 __xen_set_pgd_hyper(ptr, val);
740 xen_mc_issue(PARAVIRT_LAZY_MMU);
745 void xen_set_pgd(pgd_t *ptr, pgd_t val)
747 pgd_t *user_ptr = xen_get_user_pgd(ptr);
749 ADD_STATS(pgd_update, 1);
751 /* If page is not pinned, we can just update the entry
753 if (!xen_page_pinned(ptr)) {
756 WARN_ON(xen_page_pinned(user_ptr));
762 ADD_STATS(pgd_update_pinned, 1);
763 ADD_STATS(pgd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
765 /* If it's pinned, then we can at least batch the kernel and
766 user updates together. */
769 __xen_set_pgd_hyper(ptr, val);
771 __xen_set_pgd_hyper(user_ptr, val);
773 xen_mc_issue(PARAVIRT_LAZY_MMU);
775 #endif /* PAGETABLE_LEVELS == 4 */
778 * (Yet another) pagetable walker. This one is intended for pinning a
779 * pagetable. This means that it walks a pagetable and calls the
780 * callback function on each page it finds making up the page table,
781 * at every level. It walks the entire pagetable, but it only bothers
782 * pinning pte pages which are below limit. In the normal case this
783 * will be STACK_TOP_MAX, but at boot we need to pin up to
786 * For 32-bit the important bit is that we don't pin beyond there,
787 * because then we start getting into Xen's ptes.
789 * For 64-bit, we must skip the Xen hole in the middle of the address
790 * space, just after the big x86-64 virtual hole.
792 static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
793 int (*func)(struct mm_struct *mm, struct page *,
798 unsigned hole_low, hole_high;
799 unsigned pgdidx_limit, pudidx_limit, pmdidx_limit;
800 unsigned pgdidx, pudidx, pmdidx;
802 /* The limit is the last byte to be touched */
804 BUG_ON(limit >= FIXADDR_TOP);
806 if (xen_feature(XENFEAT_auto_translated_physmap))
810 * 64-bit has a great big hole in the middle of the address
811 * space, which contains the Xen mappings. On 32-bit these
812 * will end up making a zero-sized hole and so is a no-op.
814 hole_low = pgd_index(USER_LIMIT);
815 hole_high = pgd_index(PAGE_OFFSET);
817 pgdidx_limit = pgd_index(limit);
819 pudidx_limit = pud_index(limit);
824 pmdidx_limit = pmd_index(limit);
829 for (pgdidx = 0; pgdidx <= pgdidx_limit; pgdidx++) {
832 if (pgdidx >= hole_low && pgdidx < hole_high)
835 if (!pgd_val(pgd[pgdidx]))
838 pud = pud_offset(&pgd[pgdidx], 0);
840 if (PTRS_PER_PUD > 1) /* not folded */
841 flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
843 for (pudidx = 0; pudidx < PTRS_PER_PUD; pudidx++) {
846 if (pgdidx == pgdidx_limit &&
847 pudidx > pudidx_limit)
850 if (pud_none(pud[pudidx]))
853 pmd = pmd_offset(&pud[pudidx], 0);
855 if (PTRS_PER_PMD > 1) /* not folded */
856 flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
858 for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++) {
861 if (pgdidx == pgdidx_limit &&
862 pudidx == pudidx_limit &&
863 pmdidx > pmdidx_limit)
866 if (pmd_none(pmd[pmdidx]))
869 pte = pmd_page(pmd[pmdidx]);
870 flush |= (*func)(mm, pte, PT_PTE);
876 /* Do the top level last, so that the callbacks can use it as
877 a cue to do final things like tlb flushes. */
878 flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
883 static int xen_pgd_walk(struct mm_struct *mm,
884 int (*func)(struct mm_struct *mm, struct page *,
888 return __xen_pgd_walk(mm, mm->pgd, func, limit);
891 /* If we're using split pte locks, then take the page's lock and
892 return a pointer to it. Otherwise return NULL. */
893 static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
895 spinlock_t *ptl = NULL;
897 #if USE_SPLIT_PTLOCKS
898 ptl = __pte_lockptr(page);
899 spin_lock_nest_lock(ptl, &mm->page_table_lock);
905 static void xen_pte_unlock(void *v)
911 static void xen_do_pin(unsigned level, unsigned long pfn)
913 struct mmuext_op *op;
914 struct multicall_space mcs;
916 mcs = __xen_mc_entry(sizeof(*op));
919 op->arg1.mfn = pfn_to_mfn(pfn);
920 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
923 static int xen_pin_page(struct mm_struct *mm, struct page *page,
926 unsigned pgfl = TestSetPagePinned(page);
930 flush = 0; /* already pinned */
931 else if (PageHighMem(page))
932 /* kmaps need flushing if we found an unpinned
936 void *pt = lowmem_page_address(page);
937 unsigned long pfn = page_to_pfn(page);
938 struct multicall_space mcs = __xen_mc_entry(0);
944 * We need to hold the pagetable lock between the time
945 * we make the pagetable RO and when we actually pin
946 * it. If we don't, then other users may come in and
947 * attempt to update the pagetable by writing it,
948 * which will fail because the memory is RO but not
949 * pinned, so Xen won't do the trap'n'emulate.
951 * If we're using split pte locks, we can't hold the
952 * entire pagetable's worth of locks during the
953 * traverse, because we may wrap the preempt count (8
954 * bits). The solution is to mark RO and pin each PTE
955 * page while holding the lock. This means the number
956 * of locks we end up holding is never more than a
957 * batch size (~32 entries, at present).
959 * If we're not using split pte locks, we needn't pin
960 * the PTE pages independently, because we're
961 * protected by the overall pagetable lock.
965 ptl = xen_pte_lock(page, mm);
967 MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
968 pfn_pte(pfn, PAGE_KERNEL_RO),
969 level == PT_PGD ? UVMF_TLB_FLUSH : 0);
972 xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
974 /* Queue a deferred unlock for when this batch
976 xen_mc_callback(xen_pte_unlock, ptl);
983 /* This is called just after a mm has been created, but it has not
984 been used yet. We need to make sure that its pagetable is all
985 read-only, and can be pinned. */
986 static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
990 if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
991 /* re-enable interrupts for flushing */
1001 pgd_t *user_pgd = xen_get_user_pgd(pgd);
1003 xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
1006 xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
1007 xen_do_pin(MMUEXT_PIN_L4_TABLE,
1008 PFN_DOWN(__pa(user_pgd)));
1011 #else /* CONFIG_X86_32 */
1012 #ifdef CONFIG_X86_PAE
1013 /* Need to make sure unshared kernel PMD is pinnable */
1014 xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
1017 xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
1018 #endif /* CONFIG_X86_64 */
1022 static void xen_pgd_pin(struct mm_struct *mm)
1024 __xen_pgd_pin(mm, mm->pgd);
1028 * On save, we need to pin all pagetables to make sure they get their
1029 * mfns turned into pfns. Search the list for any unpinned pgds and pin
1030 * them (unpinned pgds are not currently in use, probably because the
1031 * process is under construction or destruction).
1033 * Expected to be called in stop_machine() ("equivalent to taking
1034 * every spinlock in the system"), so the locking doesn't really
1035 * matter all that much.
1037 void xen_mm_pin_all(void)
1041 spin_lock(&pgd_lock);
1043 list_for_each_entry(page, &pgd_list, lru) {
1044 if (!PagePinned(page)) {
1045 __xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
1046 SetPageSavePinned(page);
1050 spin_unlock(&pgd_lock);
1054 * The init_mm pagetable is really pinned as soon as its created, but
1055 * that's before we have page structures to store the bits. So do all
1056 * the book-keeping now.
1058 static __init int xen_mark_pinned(struct mm_struct *mm, struct page *page,
1059 enum pt_level level)
1061 SetPagePinned(page);
1065 static void __init xen_mark_init_mm_pinned(void)
1067 xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
1070 static int xen_unpin_page(struct mm_struct *mm, struct page *page,
1071 enum pt_level level)
1073 unsigned pgfl = TestClearPagePinned(page);
1075 if (pgfl && !PageHighMem(page)) {
1076 void *pt = lowmem_page_address(page);
1077 unsigned long pfn = page_to_pfn(page);
1078 spinlock_t *ptl = NULL;
1079 struct multicall_space mcs;
1082 * Do the converse to pin_page. If we're using split
1083 * pte locks, we must be holding the lock for while
1084 * the pte page is unpinned but still RO to prevent
1085 * concurrent updates from seeing it in this
1086 * partially-pinned state.
1088 if (level == PT_PTE) {
1089 ptl = xen_pte_lock(page, mm);
1092 xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
1095 mcs = __xen_mc_entry(0);
1097 MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
1098 pfn_pte(pfn, PAGE_KERNEL),
1099 level == PT_PGD ? UVMF_TLB_FLUSH : 0);
1102 /* unlock when batch completed */
1103 xen_mc_callback(xen_pte_unlock, ptl);
1107 return 0; /* never need to flush on unpin */
1110 /* Release a pagetables pages back as normal RW */
1111 static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
1115 xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
1117 #ifdef CONFIG_X86_64
1119 pgd_t *user_pgd = xen_get_user_pgd(pgd);
1122 xen_do_pin(MMUEXT_UNPIN_TABLE,
1123 PFN_DOWN(__pa(user_pgd)));
1124 xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
1129 #ifdef CONFIG_X86_PAE
1130 /* Need to make sure unshared kernel PMD is unpinned */
1131 xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
1135 __xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
1140 static void xen_pgd_unpin(struct mm_struct *mm)
1142 __xen_pgd_unpin(mm, mm->pgd);
1146 * On resume, undo any pinning done at save, so that the rest of the
1147 * kernel doesn't see any unexpected pinned pagetables.
1149 void xen_mm_unpin_all(void)
1153 spin_lock(&pgd_lock);
1155 list_for_each_entry(page, &pgd_list, lru) {
1156 if (PageSavePinned(page)) {
1157 BUG_ON(!PagePinned(page));
1158 __xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
1159 ClearPageSavePinned(page);
1163 spin_unlock(&pgd_lock);
1166 void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
1168 spin_lock(&next->page_table_lock);
1170 spin_unlock(&next->page_table_lock);
1173 void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
1175 spin_lock(&mm->page_table_lock);
1177 spin_unlock(&mm->page_table_lock);
1182 /* Another cpu may still have their %cr3 pointing at the pagetable, so
1183 we need to repoint it somewhere else before we can unpin it. */
1184 static void drop_other_mm_ref(void *info)
1186 struct mm_struct *mm = info;
1187 struct mm_struct *active_mm;
1189 active_mm = percpu_read(cpu_tlbstate.active_mm);
1191 if (active_mm == mm)
1192 leave_mm(smp_processor_id());
1194 /* If this cpu still has a stale cr3 reference, then make sure
1195 it has been flushed. */
1196 if (percpu_read(xen_current_cr3) == __pa(mm->pgd))
1197 load_cr3(swapper_pg_dir);
1200 static void xen_drop_mm_ref(struct mm_struct *mm)
1205 if (current->active_mm == mm) {
1206 if (current->mm == mm)
1207 load_cr3(swapper_pg_dir);
1209 leave_mm(smp_processor_id());
1212 /* Get the "official" set of cpus referring to our pagetable. */
1213 if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) {
1214 for_each_online_cpu(cpu) {
1215 if (!cpumask_test_cpu(cpu, mm_cpumask(mm))
1216 && per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd))
1218 smp_call_function_single(cpu, drop_other_mm_ref, mm, 1);
1222 cpumask_copy(mask, mm_cpumask(mm));
1224 /* It's possible that a vcpu may have a stale reference to our
1225 cr3, because its in lazy mode, and it hasn't yet flushed
1226 its set of pending hypercalls yet. In this case, we can
1227 look at its actual current cr3 value, and force it to flush
1229 for_each_online_cpu(cpu) {
1230 if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
1231 cpumask_set_cpu(cpu, mask);
1234 if (!cpumask_empty(mask))
1235 smp_call_function_many(mask, drop_other_mm_ref, mm, 1);
1236 free_cpumask_var(mask);
1239 static void xen_drop_mm_ref(struct mm_struct *mm)
1241 if (current->active_mm == mm)
1242 load_cr3(swapper_pg_dir);
1247 * While a process runs, Xen pins its pagetables, which means that the
1248 * hypervisor forces it to be read-only, and it controls all updates
1249 * to it. This means that all pagetable updates have to go via the
1250 * hypervisor, which is moderately expensive.
1252 * Since we're pulling the pagetable down, we switch to use init_mm,
1253 * unpin old process pagetable and mark it all read-write, which
1254 * allows further operations on it to be simple memory accesses.
1256 * The only subtle point is that another CPU may be still using the
1257 * pagetable because of lazy tlb flushing. This means we need need to
1258 * switch all CPUs off this pagetable before we can unpin it.
1260 void xen_exit_mmap(struct mm_struct *mm)
1262 get_cpu(); /* make sure we don't move around */
1263 xen_drop_mm_ref(mm);
1266 spin_lock(&mm->page_table_lock);
1268 /* pgd may not be pinned in the error exit path of execve */
1269 if (xen_page_pinned(mm->pgd))
1272 spin_unlock(&mm->page_table_lock);
1275 static __init void xen_pagetable_setup_start(pgd_t *base)
1279 static void xen_post_allocator_init(void);
1281 static __init void xen_pagetable_setup_done(pgd_t *base)
1283 xen_setup_shared_info();
1284 xen_post_allocator_init();
1287 static void xen_write_cr2(unsigned long cr2)
1289 percpu_read(xen_vcpu)->arch.cr2 = cr2;
1292 static unsigned long xen_read_cr2(void)
1294 return percpu_read(xen_vcpu)->arch.cr2;
1297 unsigned long xen_read_cr2_direct(void)
1299 return percpu_read(xen_vcpu_info.arch.cr2);
1302 static void xen_flush_tlb(void)
1304 struct mmuext_op *op;
1305 struct multicall_space mcs;
1309 mcs = xen_mc_entry(sizeof(*op));
1312 op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
1313 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
1315 xen_mc_issue(PARAVIRT_LAZY_MMU);
1320 static void xen_flush_tlb_single(unsigned long addr)
1322 struct mmuext_op *op;
1323 struct multicall_space mcs;
1327 mcs = xen_mc_entry(sizeof(*op));
1329 op->cmd = MMUEXT_INVLPG_LOCAL;
1330 op->arg1.linear_addr = addr & PAGE_MASK;
1331 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
1333 xen_mc_issue(PARAVIRT_LAZY_MMU);
1338 static void xen_flush_tlb_others(const struct cpumask *cpus,
1339 struct mm_struct *mm, unsigned long va)
1342 struct mmuext_op op;
1343 DECLARE_BITMAP(mask, NR_CPUS);
1345 struct multicall_space mcs;
1347 if (cpumask_empty(cpus))
1348 return; /* nothing to do */
1350 mcs = xen_mc_entry(sizeof(*args));
1352 args->op.arg2.vcpumask = to_cpumask(args->mask);
1354 /* Remove us, and any offline CPUS. */
1355 cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
1356 cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
1358 if (va == TLB_FLUSH_ALL) {
1359 args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
1361 args->op.cmd = MMUEXT_INVLPG_MULTI;
1362 args->op.arg1.linear_addr = va;
1365 MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
1367 xen_mc_issue(PARAVIRT_LAZY_MMU);
1370 static unsigned long xen_read_cr3(void)
1372 return percpu_read(xen_cr3);
1375 static void set_current_cr3(void *v)
1377 percpu_write(xen_current_cr3, (unsigned long)v);
1380 static void __xen_write_cr3(bool kernel, unsigned long cr3)
1382 struct mmuext_op *op;
1383 struct multicall_space mcs;
1387 mfn = pfn_to_mfn(PFN_DOWN(cr3));
1391 WARN_ON(mfn == 0 && kernel);
1393 mcs = __xen_mc_entry(sizeof(*op));
1396 op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
1399 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
1402 percpu_write(xen_cr3, cr3);
1404 /* Update xen_current_cr3 once the batch has actually
1406 xen_mc_callback(set_current_cr3, (void *)cr3);
1410 static void xen_write_cr3(unsigned long cr3)
1412 BUG_ON(preemptible());
1414 xen_mc_batch(); /* disables interrupts */
1416 /* Update while interrupts are disabled, so its atomic with
1418 percpu_write(xen_cr3, cr3);
1420 __xen_write_cr3(true, cr3);
1422 #ifdef CONFIG_X86_64
1424 pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
1426 __xen_write_cr3(false, __pa(user_pgd));
1428 __xen_write_cr3(false, 0);
1432 xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
1435 static int xen_pgd_alloc(struct mm_struct *mm)
1437 pgd_t *pgd = mm->pgd;
1440 BUG_ON(PagePinned(virt_to_page(pgd)));
1442 #ifdef CONFIG_X86_64
1444 struct page *page = virt_to_page(pgd);
1447 BUG_ON(page->private != 0);
1451 user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
1452 page->private = (unsigned long)user_pgd;
1454 if (user_pgd != NULL) {
1455 user_pgd[pgd_index(VSYSCALL_START)] =
1456 __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
1460 BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
1467 static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
1469 #ifdef CONFIG_X86_64
1470 pgd_t *user_pgd = xen_get_user_pgd(pgd);
1473 free_page((unsigned long)user_pgd);
1477 static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
1479 unsigned long pfn = pte_pfn(pte);
1481 #ifdef CONFIG_X86_32
1482 /* If there's an existing pte, then don't allow _PAGE_RW to be set */
1483 if (pte_val_ma(*ptep) & _PAGE_PRESENT)
1484 pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
1489 * If the new pfn is within the range of the newly allocated
1490 * kernel pagetable, and it isn't being mapped into an
1491 * early_ioremap fixmap slot, make sure it is RO.
1493 if (!is_early_ioremap_ptep(ptep) &&
1494 pfn >= pgt_buf_start && pfn < pgt_buf_end)
1495 pte = pte_wrprotect(pte);
1500 /* Init-time set_pte while constructing initial pagetables, which
1501 doesn't allow RO pagetable pages to be remapped RW */
1502 static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)
1504 pte = mask_rw_pte(ptep, pte);
1506 xen_set_pte(ptep, pte);
1509 static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
1511 struct mmuext_op op;
1513 op.arg1.mfn = pfn_to_mfn(pfn);
1514 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
1518 /* Early in boot, while setting up the initial pagetable, assume
1519 everything is pinned. */
1520 static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
1522 #ifdef CONFIG_FLATMEM
1523 BUG_ON(mem_map); /* should only be used early */
1525 make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
1526 pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
1529 /* Used for pmd and pud */
1530 static __init void xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
1532 #ifdef CONFIG_FLATMEM
1533 BUG_ON(mem_map); /* should only be used early */
1535 make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
1538 /* Early release_pte assumes that all pts are pinned, since there's
1539 only init_mm and anything attached to that is pinned. */
1540 static __init void xen_release_pte_init(unsigned long pfn)
1542 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
1543 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
1546 static __init void xen_release_pmd_init(unsigned long pfn)
1548 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
1551 /* This needs to make sure the new pte page is pinned iff its being
1552 attached to a pinned pagetable. */
1553 static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned level)
1555 struct page *page = pfn_to_page(pfn);
1557 if (PagePinned(virt_to_page(mm->pgd))) {
1558 SetPagePinned(page);
1560 if (!PageHighMem(page)) {
1561 make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
1562 if (level == PT_PTE && USE_SPLIT_PTLOCKS)
1563 pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
1565 /* make sure there are no stray mappings of
1567 kmap_flush_unused();
1572 static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
1574 xen_alloc_ptpage(mm, pfn, PT_PTE);
1577 static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
1579 xen_alloc_ptpage(mm, pfn, PT_PMD);
1582 /* This should never happen until we're OK to use struct page */
1583 static void xen_release_ptpage(unsigned long pfn, unsigned level)
1585 struct page *page = pfn_to_page(pfn);
1587 if (PagePinned(page)) {
1588 if (!PageHighMem(page)) {
1589 if (level == PT_PTE && USE_SPLIT_PTLOCKS)
1590 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
1591 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
1593 ClearPagePinned(page);
1597 static void xen_release_pte(unsigned long pfn)
1599 xen_release_ptpage(pfn, PT_PTE);
1602 static void xen_release_pmd(unsigned long pfn)
1604 xen_release_ptpage(pfn, PT_PMD);
1607 #if PAGETABLE_LEVELS == 4
1608 static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
1610 xen_alloc_ptpage(mm, pfn, PT_PUD);
1613 static void xen_release_pud(unsigned long pfn)
1615 xen_release_ptpage(pfn, PT_PUD);
1619 void __init xen_reserve_top(void)
1621 #ifdef CONFIG_X86_32
1622 unsigned long top = HYPERVISOR_VIRT_START;
1623 struct xen_platform_parameters pp;
1625 if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
1626 top = pp.virt_start;
1628 reserve_top_address(-top);
1629 #endif /* CONFIG_X86_32 */
1633 * Like __va(), but returns address in the kernel mapping (which is
1634 * all we have until the physical memory mapping has been set up.
1636 static void *__ka(phys_addr_t paddr)
1638 #ifdef CONFIG_X86_64
1639 return (void *)(paddr + __START_KERNEL_map);
1645 /* Convert a machine address to physical address */
1646 static unsigned long m2p(phys_addr_t maddr)
1650 maddr &= PTE_PFN_MASK;
1651 paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
1656 /* Convert a machine address to kernel virtual */
1657 static void *m2v(phys_addr_t maddr)
1659 return __ka(m2p(maddr));
1662 /* Set the page permissions on an identity-mapped pages */
1663 static void set_page_prot(void *addr, pgprot_t prot)
1665 unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
1666 pte_t pte = pfn_pte(pfn, prot);
1668 if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
1672 static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
1674 unsigned pmdidx, pteidx;
1678 level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
1683 for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
1686 /* Reuse or allocate a page of ptes */
1687 if (pmd_present(pmd[pmdidx]))
1688 pte_page = m2v(pmd[pmdidx].pmd);
1690 /* Check for free pte pages */
1691 if (ident_pte == LEVEL1_IDENT_ENTRIES)
1694 pte_page = &level1_ident_pgt[ident_pte];
1695 ident_pte += PTRS_PER_PTE;
1697 pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
1700 /* Install mappings */
1701 for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
1704 if (!pte_none(pte_page[pteidx]))
1707 pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
1708 pte_page[pteidx] = pte;
1712 for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
1713 set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
1715 set_page_prot(pmd, PAGE_KERNEL_RO);
1718 void __init xen_setup_machphys_mapping(void)
1720 struct xen_machphys_mapping mapping;
1721 unsigned long machine_to_phys_nr_ents;
1723 if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
1724 machine_to_phys_mapping = (unsigned long *)mapping.v_start;
1725 machine_to_phys_nr_ents = mapping.max_mfn + 1;
1727 machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
1729 machine_to_phys_order = fls(machine_to_phys_nr_ents - 1);
1732 #ifdef CONFIG_X86_64
1733 static void convert_pfn_mfn(void *v)
1738 /* All levels are converted the same way, so just treat them
1740 for (i = 0; i < PTRS_PER_PTE; i++)
1741 pte[i] = xen_make_pte(pte[i].pte);
1745 * Set up the initial kernel pagetable.
1747 * We can construct this by grafting the Xen provided pagetable into
1748 * head_64.S's preconstructed pagetables. We copy the Xen L2's into
1749 * level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
1750 * means that only the kernel has a physical mapping to start with -
1751 * but that's enough to get __va working. We need to fill in the rest
1752 * of the physical mapping once some sort of allocator has been set
1755 __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
1756 unsigned long max_pfn)
1761 /* max_pfn_mapped is the last pfn mapped in the initial memory
1762 * mappings. Considering that on Xen after the kernel mappings we
1763 * have the mappings of some pages that don't exist in pfn space, we
1764 * set max_pfn_mapped to the last real pfn mapped. */
1765 max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
1767 /* Zap identity mapping */
1768 init_level4_pgt[0] = __pgd(0);
1770 /* Pre-constructed entries are in pfn, so convert to mfn */
1771 convert_pfn_mfn(init_level4_pgt);
1772 convert_pfn_mfn(level3_ident_pgt);
1773 convert_pfn_mfn(level3_kernel_pgt);
1775 l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
1776 l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
1778 memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1779 memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1781 l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd);
1782 l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud);
1783 memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1785 /* Set up identity map */
1786 xen_map_identity_early(level2_ident_pgt, max_pfn);
1788 /* Make pagetable pieces RO */
1789 set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
1790 set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
1791 set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
1792 set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
1793 set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
1794 set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
1796 /* Pin down new L4 */
1797 pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
1798 PFN_DOWN(__pa_symbol(init_level4_pgt)));
1800 /* Unpin Xen-provided one */
1801 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
1804 pgd = init_level4_pgt;
1807 * At this stage there can be no user pgd, and no page
1808 * structure to attach it to, so make sure we just set kernel
1812 __xen_write_cr3(true, __pa(pgd));
1813 xen_mc_issue(PARAVIRT_LAZY_CPU);
1815 memblock_x86_reserve_range(__pa(xen_start_info->pt_base),
1816 __pa(xen_start_info->pt_base +
1817 xen_start_info->nr_pt_frames * PAGE_SIZE),
1822 #else /* !CONFIG_X86_64 */
1823 static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
1824 static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
1826 static __init void xen_write_cr3_init(unsigned long cr3)
1828 unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
1830 BUG_ON(read_cr3() != __pa(initial_page_table));
1831 BUG_ON(cr3 != __pa(swapper_pg_dir));
1834 * We are switching to swapper_pg_dir for the first time (from
1835 * initial_page_table) and therefore need to mark that page
1836 * read-only and then pin it.
1838 * Xen disallows sharing of kernel PMDs for PAE
1839 * guests. Therefore we must copy the kernel PMD from
1840 * initial_page_table into a new kernel PMD to be used in
1843 swapper_kernel_pmd =
1844 extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
1845 memcpy(swapper_kernel_pmd, initial_kernel_pmd,
1846 sizeof(pmd_t) * PTRS_PER_PMD);
1847 swapper_pg_dir[KERNEL_PGD_BOUNDARY] =
1848 __pgd(__pa(swapper_kernel_pmd) | _PAGE_PRESENT);
1849 set_page_prot(swapper_kernel_pmd, PAGE_KERNEL_RO);
1851 set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
1853 pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);
1855 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
1856 PFN_DOWN(__pa(initial_page_table)));
1857 set_page_prot(initial_page_table, PAGE_KERNEL);
1858 set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
1860 pv_mmu_ops.write_cr3 = &xen_write_cr3;
1863 __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
1864 unsigned long max_pfn)
1868 initial_kernel_pmd =
1869 extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
1871 max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
1873 kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
1874 memcpy(initial_kernel_pmd, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
1876 xen_map_identity_early(initial_kernel_pmd, max_pfn);
1878 memcpy(initial_page_table, pgd, sizeof(pgd_t) * PTRS_PER_PGD);
1879 initial_page_table[KERNEL_PGD_BOUNDARY] =
1880 __pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
1882 set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
1883 set_page_prot(initial_page_table, PAGE_KERNEL_RO);
1884 set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
1886 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
1888 pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
1889 PFN_DOWN(__pa(initial_page_table)));
1890 xen_write_cr3(__pa(initial_page_table));
1892 memblock_x86_reserve_range(__pa(xen_start_info->pt_base),
1893 __pa(xen_start_info->pt_base +
1894 xen_start_info->nr_pt_frames * PAGE_SIZE),
1897 return initial_page_table;
1899 #endif /* CONFIG_X86_64 */
1901 static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
1903 static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
1907 phys >>= PAGE_SHIFT;
1910 case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
1911 #ifdef CONFIG_X86_F00F_BUG
1914 #ifdef CONFIG_X86_32
1917 # ifdef CONFIG_HIGHMEM
1918 case FIX_KMAP_BEGIN ... FIX_KMAP_END:
1921 case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
1923 case FIX_TEXT_POKE0:
1924 case FIX_TEXT_POKE1:
1925 /* All local page mappings */
1926 pte = pfn_pte(phys, prot);
1929 #ifdef CONFIG_X86_LOCAL_APIC
1930 case FIX_APIC_BASE: /* maps dummy local APIC */
1931 pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
1935 #ifdef CONFIG_X86_IO_APIC
1936 case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
1938 * We just don't map the IO APIC - all access is via
1939 * hypercalls. Keep the address in the pte for reference.
1941 pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
1945 case FIX_PARAVIRT_BOOTMAP:
1946 /* This is an MFN, but it isn't an IO mapping from the
1948 pte = mfn_pte(phys, prot);
1952 /* By default, set_fixmap is used for hardware mappings */
1953 pte = mfn_pte(phys, __pgprot(pgprot_val(prot) | _PAGE_IOMAP));
1957 __native_set_fixmap(idx, pte);
1959 #ifdef CONFIG_X86_64
1960 /* Replicate changes to map the vsyscall page into the user
1961 pagetable vsyscall mapping. */
1962 if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
1963 unsigned long vaddr = __fix_to_virt(idx);
1964 set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
1969 __init void xen_ident_map_ISA(void)
1974 * If we're dom0, then linear map the ISA machine addresses into
1975 * the kernel's address space.
1977 if (!xen_initial_domain())
1980 xen_raw_printk("Xen: setup ISA identity maps\n");
1982 for (pa = ISA_START_ADDRESS; pa < ISA_END_ADDRESS; pa += PAGE_SIZE) {
1983 pte_t pte = mfn_pte(PFN_DOWN(pa), PAGE_KERNEL_IO);
1985 if (HYPERVISOR_update_va_mapping(PAGE_OFFSET + pa, pte, 0))
1992 static __init void xen_post_allocator_init(void)
1994 #ifdef CONFIG_XEN_DEBUG
1995 pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte_debug);
1997 pv_mmu_ops.set_pte = xen_set_pte;
1998 pv_mmu_ops.set_pmd = xen_set_pmd;
1999 pv_mmu_ops.set_pud = xen_set_pud;
2000 #if PAGETABLE_LEVELS == 4
2001 pv_mmu_ops.set_pgd = xen_set_pgd;
2004 /* This will work as long as patching hasn't happened yet
2005 (which it hasn't) */
2006 pv_mmu_ops.alloc_pte = xen_alloc_pte;
2007 pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
2008 pv_mmu_ops.release_pte = xen_release_pte;
2009 pv_mmu_ops.release_pmd = xen_release_pmd;
2010 #if PAGETABLE_LEVELS == 4
2011 pv_mmu_ops.alloc_pud = xen_alloc_pud;
2012 pv_mmu_ops.release_pud = xen_release_pud;
2015 #ifdef CONFIG_X86_64
2016 SetPagePinned(virt_to_page(level3_user_vsyscall));
2018 xen_mark_init_mm_pinned();
2021 static void xen_leave_lazy_mmu(void)
2025 paravirt_leave_lazy_mmu();
2029 static const struct pv_mmu_ops xen_mmu_ops __initdata = {
2030 .read_cr2 = xen_read_cr2,
2031 .write_cr2 = xen_write_cr2,
2033 .read_cr3 = xen_read_cr3,
2034 #ifdef CONFIG_X86_32
2035 .write_cr3 = xen_write_cr3_init,
2037 .write_cr3 = xen_write_cr3,
2040 .flush_tlb_user = xen_flush_tlb,
2041 .flush_tlb_kernel = xen_flush_tlb,
2042 .flush_tlb_single = xen_flush_tlb_single,
2043 .flush_tlb_others = xen_flush_tlb_others,
2045 .pte_update = paravirt_nop,
2046 .pte_update_defer = paravirt_nop,
2048 .pgd_alloc = xen_pgd_alloc,
2049 .pgd_free = xen_pgd_free,
2051 .alloc_pte = xen_alloc_pte_init,
2052 .release_pte = xen_release_pte_init,
2053 .alloc_pmd = xen_alloc_pmd_init,
2054 .release_pmd = xen_release_pmd_init,
2056 .set_pte = xen_set_pte_init,
2057 .set_pte_at = xen_set_pte_at,
2058 .set_pmd = xen_set_pmd_hyper,
2060 .ptep_modify_prot_start = __ptep_modify_prot_start,
2061 .ptep_modify_prot_commit = __ptep_modify_prot_commit,
2063 .pte_val = PV_CALLEE_SAVE(xen_pte_val),
2064 .pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
2066 .make_pte = PV_CALLEE_SAVE(xen_make_pte),
2067 .make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
2069 #ifdef CONFIG_X86_PAE
2070 .set_pte_atomic = xen_set_pte_atomic,
2071 .pte_clear = xen_pte_clear,
2072 .pmd_clear = xen_pmd_clear,
2073 #endif /* CONFIG_X86_PAE */
2074 .set_pud = xen_set_pud_hyper,
2076 .make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
2077 .pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
2079 #if PAGETABLE_LEVELS == 4
2080 .pud_val = PV_CALLEE_SAVE(xen_pud_val),
2081 .make_pud = PV_CALLEE_SAVE(xen_make_pud),
2082 .set_pgd = xen_set_pgd_hyper,
2084 .alloc_pud = xen_alloc_pmd_init,
2085 .release_pud = xen_release_pmd_init,
2086 #endif /* PAGETABLE_LEVELS == 4 */
2088 .activate_mm = xen_activate_mm,
2089 .dup_mmap = xen_dup_mmap,
2090 .exit_mmap = xen_exit_mmap,
2093 .enter = paravirt_enter_lazy_mmu,
2094 .leave = xen_leave_lazy_mmu,
2097 .set_fixmap = xen_set_fixmap,
2100 void __init xen_init_mmu_ops(void)
2102 x86_init.paging.pagetable_setup_start = xen_pagetable_setup_start;
2103 x86_init.paging.pagetable_setup_done = xen_pagetable_setup_done;
2104 pv_mmu_ops = xen_mmu_ops;
2106 memset(dummy_mapping, 0xff, PAGE_SIZE);
2109 /* Protected by xen_reservation_lock. */
2110 #define MAX_CONTIG_ORDER 9 /* 2MB */
2111 static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
2113 #define VOID_PTE (mfn_pte(0, __pgprot(0)))
2114 static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
2115 unsigned long *in_frames,
2116 unsigned long *out_frames)
2119 struct multicall_space mcs;
2122 for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
2123 mcs = __xen_mc_entry(0);
2126 in_frames[i] = virt_to_mfn(vaddr);
2128 MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
2129 __set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
2132 out_frames[i] = virt_to_pfn(vaddr);
2138 * Update the pfn-to-mfn mappings for a virtual address range, either to
2139 * point to an array of mfns, or contiguously from a single starting
2142 static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
2143 unsigned long *mfns,
2144 unsigned long first_mfn)
2151 limit = 1u << order;
2152 for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
2153 struct multicall_space mcs;
2156 mcs = __xen_mc_entry(0);
2160 mfn = first_mfn + i;
2162 if (i < (limit - 1))
2166 flags = UVMF_INVLPG | UVMF_ALL;
2168 flags = UVMF_TLB_FLUSH | UVMF_ALL;
2171 MULTI_update_va_mapping(mcs.mc, vaddr,
2172 mfn_pte(mfn, PAGE_KERNEL), flags);
2174 set_phys_to_machine(virt_to_pfn(vaddr), mfn);
2181 * Perform the hypercall to exchange a region of our pfns to point to
2182 * memory with the required contiguous alignment. Takes the pfns as
2183 * input, and populates mfns as output.
2185 * Returns a success code indicating whether the hypervisor was able to
2186 * satisfy the request or not.
2188 static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
2189 unsigned long *pfns_in,
2190 unsigned long extents_out,
2191 unsigned int order_out,
2192 unsigned long *mfns_out,
2193 unsigned int address_bits)
2198 struct xen_memory_exchange exchange = {
2200 .nr_extents = extents_in,
2201 .extent_order = order_in,
2202 .extent_start = pfns_in,
2206 .nr_extents = extents_out,
2207 .extent_order = order_out,
2208 .extent_start = mfns_out,
2209 .address_bits = address_bits,
2214 BUG_ON(extents_in << order_in != extents_out << order_out);
2216 rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
2217 success = (exchange.nr_exchanged == extents_in);
2219 BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
2220 BUG_ON(success && (rc != 0));
2225 int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
2226 unsigned int address_bits)
2228 unsigned long *in_frames = discontig_frames, out_frame;
2229 unsigned long flags;
2233 * Currently an auto-translated guest will not perform I/O, nor will
2234 * it require PAE page directories below 4GB. Therefore any calls to
2235 * this function are redundant and can be ignored.
2238 if (xen_feature(XENFEAT_auto_translated_physmap))
2241 if (unlikely(order > MAX_CONTIG_ORDER))
2244 memset((void *) vstart, 0, PAGE_SIZE << order);
2246 spin_lock_irqsave(&xen_reservation_lock, flags);
2248 /* 1. Zap current PTEs, remembering MFNs. */
2249 xen_zap_pfn_range(vstart, order, in_frames, NULL);
2251 /* 2. Get a new contiguous memory extent. */
2252 out_frame = virt_to_pfn(vstart);
2253 success = xen_exchange_memory(1UL << order, 0, in_frames,
2254 1, order, &out_frame,
2257 /* 3. Map the new extent in place of old pages. */
2259 xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
2261 xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
2263 spin_unlock_irqrestore(&xen_reservation_lock, flags);
2265 return success ? 0 : -ENOMEM;
2267 EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
2269 void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
2271 unsigned long *out_frames = discontig_frames, in_frame;
2272 unsigned long flags;
2275 if (xen_feature(XENFEAT_auto_translated_physmap))
2278 if (unlikely(order > MAX_CONTIG_ORDER))
2281 memset((void *) vstart, 0, PAGE_SIZE << order);
2283 spin_lock_irqsave(&xen_reservation_lock, flags);
2285 /* 1. Find start MFN of contiguous extent. */
2286 in_frame = virt_to_mfn(vstart);
2288 /* 2. Zap current PTEs. */
2289 xen_zap_pfn_range(vstart, order, NULL, out_frames);
2291 /* 3. Do the exchange for non-contiguous MFNs. */
2292 success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
2295 /* 4. Map new pages in place of old pages. */
2297 xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
2299 xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
2301 spin_unlock_irqrestore(&xen_reservation_lock, flags);
2303 EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
2305 #ifdef CONFIG_XEN_PVHVM
2306 static void xen_hvm_exit_mmap(struct mm_struct *mm)
2308 struct xen_hvm_pagetable_dying a;
2311 a.domid = DOMID_SELF;
2312 a.gpa = __pa(mm->pgd);
2313 rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
2314 WARN_ON_ONCE(rc < 0);
2317 static int is_pagetable_dying_supported(void)
2319 struct xen_hvm_pagetable_dying a;
2322 a.domid = DOMID_SELF;
2324 rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
2326 printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
2332 void __init xen_hvm_init_mmu_ops(void)
2334 if (is_pagetable_dying_supported())
2335 pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
2339 #define REMAP_BATCH_SIZE 16
2344 struct mmu_update *mmu_update;
2347 static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
2348 unsigned long addr, void *data)
2350 struct remap_data *rmd = data;
2351 pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
2353 rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
2354 rmd->mmu_update->val = pte_val_ma(pte);
2360 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
2362 unsigned long mfn, int nr,
2363 pgprot_t prot, unsigned domid)
2365 struct remap_data rmd;
2366 struct mmu_update mmu_update[REMAP_BATCH_SIZE];
2368 unsigned long range;
2371 prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
2373 BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_RESERVED | VM_IO)) ==
2374 (VM_PFNMAP | VM_RESERVED | VM_IO)));
2380 batch = min(REMAP_BATCH_SIZE, nr);
2381 range = (unsigned long)batch << PAGE_SHIFT;
2383 rmd.mmu_update = mmu_update;
2384 err = apply_to_page_range(vma->vm_mm, addr, range,
2385 remap_area_mfn_pte_fn, &rmd);
2390 if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
2404 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
2406 #ifdef CONFIG_XEN_DEBUG_FS
2408 static int p2m_dump_open(struct inode *inode, struct file *filp)
2410 return single_open(filp, p2m_dump_show, NULL);
2413 static const struct file_operations p2m_dump_fops = {
2414 .open = p2m_dump_open,
2416 .llseek = seq_lseek,
2417 .release = single_release,
2420 static struct dentry *d_mmu_debug;
2422 static int __init xen_mmu_debugfs(void)
2424 struct dentry *d_xen = xen_init_debugfs();
2429 d_mmu_debug = debugfs_create_dir("mmu", d_xen);
2431 debugfs_create_u8("zero_stats", 0644, d_mmu_debug, &zero_stats);
2433 debugfs_create_u32("pgd_update", 0444, d_mmu_debug, &mmu_stats.pgd_update);
2434 debugfs_create_u32("pgd_update_pinned", 0444, d_mmu_debug,
2435 &mmu_stats.pgd_update_pinned);
2436 debugfs_create_u32("pgd_update_batched", 0444, d_mmu_debug,
2437 &mmu_stats.pgd_update_pinned);
2439 debugfs_create_u32("pud_update", 0444, d_mmu_debug, &mmu_stats.pud_update);
2440 debugfs_create_u32("pud_update_pinned", 0444, d_mmu_debug,
2441 &mmu_stats.pud_update_pinned);
2442 debugfs_create_u32("pud_update_batched", 0444, d_mmu_debug,
2443 &mmu_stats.pud_update_pinned);
2445 debugfs_create_u32("pmd_update", 0444, d_mmu_debug, &mmu_stats.pmd_update);
2446 debugfs_create_u32("pmd_update_pinned", 0444, d_mmu_debug,
2447 &mmu_stats.pmd_update_pinned);
2448 debugfs_create_u32("pmd_update_batched", 0444, d_mmu_debug,
2449 &mmu_stats.pmd_update_pinned);
2451 debugfs_create_u32("pte_update", 0444, d_mmu_debug, &mmu_stats.pte_update);
2452 // debugfs_create_u32("pte_update_pinned", 0444, d_mmu_debug,
2453 // &mmu_stats.pte_update_pinned);
2454 debugfs_create_u32("pte_update_batched", 0444, d_mmu_debug,
2455 &mmu_stats.pte_update_pinned);
2457 debugfs_create_u32("mmu_update", 0444, d_mmu_debug, &mmu_stats.mmu_update);
2458 debugfs_create_u32("mmu_update_extended", 0444, d_mmu_debug,
2459 &mmu_stats.mmu_update_extended);
2460 xen_debugfs_create_u32_array("mmu_update_histo", 0444, d_mmu_debug,
2461 mmu_stats.mmu_update_histo, 20);
2463 debugfs_create_u32("set_pte_at", 0444, d_mmu_debug, &mmu_stats.set_pte_at);
2464 debugfs_create_u32("set_pte_at_batched", 0444, d_mmu_debug,
2465 &mmu_stats.set_pte_at_batched);
2466 debugfs_create_u32("set_pte_at_current", 0444, d_mmu_debug,
2467 &mmu_stats.set_pte_at_current);
2468 debugfs_create_u32("set_pte_at_kernel", 0444, d_mmu_debug,
2469 &mmu_stats.set_pte_at_kernel);
2471 debugfs_create_u32("prot_commit", 0444, d_mmu_debug, &mmu_stats.prot_commit);
2472 debugfs_create_u32("prot_commit_batched", 0444, d_mmu_debug,
2473 &mmu_stats.prot_commit_batched);
2475 debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops);
2478 fs_initcall(xen_mmu_debugfs);
2480 #endif /* CONFIG_XEN_DEBUG_FS */