2 * MMU operations common to all auto-translated physmap guests.
4 * Copyright (C) 2015 Citrix Systems R&D Ltd.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation; or, when distributed
9 * separately from the Linux kernel or incorporated into other
10 * software packages, subject to the following license:
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this source file (the "Software"), to deal in the Software without
14 * restriction, including without limitation the rights to use, copy, modify,
15 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
16 * and to permit persons to whom the Software is furnished to do so, subject to
17 * the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30 #include <linux/kernel.h>
33 #include <asm/xen/hypercall.h>
34 #include <asm/xen/hypervisor.h>
38 #include <xen/interface/xen.h>
39 #include <xen/interface/memory.h>
41 /* map fgmfn of domid to lpfn in the current domain */
42 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
46 struct xen_add_to_physmap_range xatp = {
48 .foreign_domid = domid,
50 .space = XENMAPSPACE_gmfn_foreign,
52 xen_ulong_t idx = fgmfn;
53 xen_pfn_t gpfn = lpfn;
56 set_xen_guest_handle(xatp.idxs, &idx);
57 set_xen_guest_handle(xatp.gpfns, &gpfn);
58 set_xen_guest_handle(xatp.errs, &err);
60 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
61 return rc < 0 ? rc : err;
65 xen_pfn_t *fgmfn; /* foreign domain's gmfn */
68 struct vm_area_struct *vma;
71 struct xen_remap_mfn_info *info;
76 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
79 struct remap_data *info = data;
80 struct page *page = info->pages[info->index++];
81 unsigned long pfn = page_to_pfn(page);
82 pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
85 rc = map_foreign_page(pfn, *info->fgmfn, info->domid);
86 *info->err_ptr++ = rc;
88 set_pte_at(info->vma->vm_mm, addr, ptep, pte);
96 int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
98 xen_pfn_t *mfn, int nr,
99 int *err_ptr, pgprot_t prot,
104 struct remap_data data;
105 unsigned long range = nr << PAGE_SHIFT;
107 /* Kept here for the purpose of making sure code doesn't break
109 BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
117 data.err_ptr = err_ptr;
120 err = apply_to_page_range(vma->vm_mm, addr, range,
121 remap_pte_fn, &data);
122 return err < 0 ? err : data.mapped;
124 EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
126 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
127 int nr, struct page **pages)
131 for (i = 0; i < nr; i++) {
132 struct xen_remove_from_physmap xrp;
135 pfn = page_to_pfn(pages[i]);
137 xrp.domid = DOMID_SELF;
139 (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
143 EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);