blob: 58a5389aec891932f18a81770a7d0a248d6c12c2 [file] [log] [blame]
David Vrabel628c28e2015-03-11 14:49:56 +00001/*
2 * MMU operations common to all auto-translated physmap guests.
3 *
4 * Copyright (C) 2015 Citrix Systems R&D Ltd.
5 *
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:
11 *
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:
18 *
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
21 *
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
28 * IN THE SOFTWARE.
29 */
30#include <linux/kernel.h>
31#include <linux/mm.h>
32
33#include <asm/xen/hypercall.h>
34#include <asm/xen/hypervisor.h>
35
36#include <xen/xen.h>
37#include <xen/page.h>
38#include <xen/interface/xen.h>
39#include <xen/interface/memory.h>
40
41/* map fgmfn of domid to lpfn in the current domain */
42static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
43 unsigned int domid)
44{
45 int rc;
46 struct xen_add_to_physmap_range xatp = {
47 .domid = DOMID_SELF,
48 .foreign_domid = domid,
49 .size = 1,
50 .space = XENMAPSPACE_gmfn_foreign,
51 };
52 xen_ulong_t idx = fgmfn;
53 xen_pfn_t gpfn = lpfn;
54 int err = 0;
55
56 set_xen_guest_handle(xatp.idxs, &idx);
57 set_xen_guest_handle(xatp.gpfns, &gpfn);
58 set_xen_guest_handle(xatp.errs, &err);
59
60 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
61 return rc < 0 ? rc : err;
62}
63
64struct remap_data {
David Vrabel4e8c0c82015-03-11 14:49:57 +000065 xen_pfn_t *fgmfn; /* foreign domain's gmfn */
David Vrabel628c28e2015-03-11 14:49:56 +000066 pgprot_t prot;
67 domid_t domid;
68 struct vm_area_struct *vma;
69 int index;
70 struct page **pages;
71 struct xen_remap_mfn_info *info;
David Vrabel4e8c0c82015-03-11 14:49:57 +000072 int *err_ptr;
73 int mapped;
David Vrabel628c28e2015-03-11 14:49:56 +000074};
75
76static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
77 void *data)
78{
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));
83 int rc;
84
David Vrabel4e8c0c82015-03-11 14:49:57 +000085 rc = map_foreign_page(pfn, *info->fgmfn, info->domid);
86 *info->err_ptr++ = rc;
87 if (!rc) {
88 set_pte_at(info->vma->vm_mm, addr, ptep, pte);
89 info->mapped++;
90 }
91 info->fgmfn++;
David Vrabel628c28e2015-03-11 14:49:56 +000092
93 return 0;
94}
95
David Vrabel4e8c0c82015-03-11 14:49:57 +000096int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
David Vrabel628c28e2015-03-11 14:49:56 +000097 unsigned long addr,
David Vrabel4e8c0c82015-03-11 14:49:57 +000098 xen_pfn_t *mfn, int nr,
99 int *err_ptr, pgprot_t prot,
100 unsigned domid,
David Vrabel628c28e2015-03-11 14:49:56 +0000101 struct page **pages)
102{
103 int err;
104 struct remap_data data;
David Vrabel4e8c0c82015-03-11 14:49:57 +0000105 unsigned long range = nr << PAGE_SHIFT;
David Vrabel628c28e2015-03-11 14:49:56 +0000106
David Vrabel4e8c0c82015-03-11 14:49:57 +0000107 /* Kept here for the purpose of making sure code doesn't break
108 x86 PVOPS */
109 BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
David Vrabel628c28e2015-03-11 14:49:56 +0000110
David Vrabel4e8c0c82015-03-11 14:49:57 +0000111 data.fgmfn = mfn;
112 data.prot = prot;
David Vrabel628c28e2015-03-11 14:49:56 +0000113 data.domid = domid;
David Vrabel4e8c0c82015-03-11 14:49:57 +0000114 data.vma = vma;
David Vrabel628c28e2015-03-11 14:49:56 +0000115 data.pages = pages;
David Vrabel4e8c0c82015-03-11 14:49:57 +0000116 data.index = 0;
117 data.err_ptr = err_ptr;
118 data.mapped = 0;
119
120 err = apply_to_page_range(vma->vm_mm, addr, range,
David Vrabel628c28e2015-03-11 14:49:56 +0000121 remap_pte_fn, &data);
David Vrabel4e8c0c82015-03-11 14:49:57 +0000122 return err < 0 ? err : data.mapped;
David Vrabel628c28e2015-03-11 14:49:56 +0000123}
David Vrabel4e8c0c82015-03-11 14:49:57 +0000124EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
David Vrabel628c28e2015-03-11 14:49:56 +0000125
126int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
127 int nr, struct page **pages)
128{
129 int i;
130
131 for (i = 0; i < nr; i++) {
132 struct xen_remove_from_physmap xrp;
133 unsigned long pfn;
134
135 pfn = page_to_pfn(pages[i]);
136
137 xrp.domid = DOMID_SELF;
138 xrp.gpfn = pfn;
139 (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
140 }
141 return 0;
142}
143EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);