David Vrabel | 628c28e | 2015-03-11 14:49:56 +0000 | [diff] [blame^] | 1 | /* |
| 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 */ |
| 42 | static 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 | |
| 64 | struct remap_data { |
| 65 | xen_pfn_t fgmfn; /* foreign domain's gmfn */ |
| 66 | 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; |
| 72 | }; |
| 73 | |
| 74 | static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr, |
| 75 | void *data) |
| 76 | { |
| 77 | struct remap_data *info = data; |
| 78 | struct page *page = info->pages[info->index++]; |
| 79 | unsigned long pfn = page_to_pfn(page); |
| 80 | pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot)); |
| 81 | int rc; |
| 82 | |
| 83 | rc = map_foreign_page(pfn, info->fgmfn, info->domid); |
| 84 | if (rc < 0) |
| 85 | return rc; |
| 86 | set_pte_at(info->vma->vm_mm, addr, ptep, pte); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | int xen_xlate_remap_gfn_range(struct vm_area_struct *vma, |
| 92 | unsigned long addr, |
| 93 | xen_pfn_t gfn, int nr, |
| 94 | pgprot_t prot, unsigned domid, |
| 95 | struct page **pages) |
| 96 | { |
| 97 | int err; |
| 98 | struct remap_data data; |
| 99 | |
| 100 | /* TBD: Batching, current sole caller only does page at a time */ |
| 101 | if (nr > 1) |
| 102 | return -EINVAL; |
| 103 | |
| 104 | data.fgmfn = gfn; |
| 105 | data.prot = prot; |
| 106 | data.domid = domid; |
| 107 | data.vma = vma; |
| 108 | data.index = 0; |
| 109 | data.pages = pages; |
| 110 | err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT, |
| 111 | remap_pte_fn, &data); |
| 112 | return err; |
| 113 | } |
| 114 | EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_range); |
| 115 | |
| 116 | int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma, |
| 117 | int nr, struct page **pages) |
| 118 | { |
| 119 | int i; |
| 120 | |
| 121 | for (i = 0; i < nr; i++) { |
| 122 | struct xen_remove_from_physmap xrp; |
| 123 | unsigned long pfn; |
| 124 | |
| 125 | pfn = page_to_pfn(pages[i]); |
| 126 | |
| 127 | xrp.domid = DOMID_SELF; |
| 128 | xrp.gpfn = pfn; |
| 129 | (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp); |
| 130 | } |
| 131 | return 0; |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range); |