/root/src/xen/xen/arch/x86/hvm/grant_table.c
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1 | | /****************************************************************************** |
2 | | * arch/x86/hvm/grant_table.c |
3 | | * |
4 | | * Grant table interfaces for HVM guests |
5 | | * |
6 | | * Copyright (C) 2017 Wei Liu <wei.liu2@citrix.com> |
7 | | * |
8 | | * This program is free software; you can redistribute it and/or modify |
9 | | * it under the terms of the GNU General Public License as published by |
10 | | * the Free Software Foundation; either version 2 of the License, or |
11 | | * (at your option) any later version. |
12 | | * |
13 | | * This program is distributed in the hope that it will be useful, |
14 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | | * GNU General Public License for more details. |
17 | | * |
18 | | * You should have received a copy of the GNU General Public License |
19 | | * along with this program; If not, see <http://www.gnu.org/licenses/>. |
20 | | */ |
21 | | |
22 | | #include <xen/types.h> |
23 | | |
24 | | #include <public/grant_table.h> |
25 | | |
26 | | #include <asm/p2m.h> |
27 | | |
28 | | int create_grant_p2m_mapping(uint64_t addr, unsigned long frame, |
29 | | unsigned int flags, |
30 | | unsigned int cache_flags) |
31 | 0 | { |
32 | 0 | p2m_type_t p2mt; |
33 | 0 | int rc; |
34 | 0 |
|
35 | 0 | if ( cache_flags || (flags & ~GNTMAP_readonly) != GNTMAP_host_map ) |
36 | 0 | return GNTST_general_error; |
37 | 0 |
|
38 | 0 | if ( flags & GNTMAP_readonly ) |
39 | 0 | p2mt = p2m_grant_map_ro; |
40 | 0 | else |
41 | 0 | p2mt = p2m_grant_map_rw; |
42 | 0 | rc = guest_physmap_add_entry(current->domain, |
43 | 0 | _gfn(addr >> PAGE_SHIFT), |
44 | 0 | _mfn(frame), PAGE_ORDER_4K, p2mt); |
45 | 0 | if ( rc ) |
46 | 0 | return GNTST_general_error; |
47 | 0 | else |
48 | 0 | return GNTST_okay; |
49 | 0 | } |
50 | | |
51 | | int replace_grant_p2m_mapping(uint64_t addr, unsigned long frame, |
52 | | uint64_t new_addr, unsigned int flags) |
53 | 0 | { |
54 | 0 | unsigned long gfn = (unsigned long)(addr >> PAGE_SHIFT); |
55 | 0 | p2m_type_t type; |
56 | 0 | mfn_t old_mfn; |
57 | 0 | struct domain *d = current->domain; |
58 | 0 |
|
59 | 0 | if ( new_addr != 0 || (flags & GNTMAP_contains_pte) ) |
60 | 0 | return GNTST_general_error; |
61 | 0 |
|
62 | 0 | old_mfn = get_gfn(d, gfn, &type); |
63 | 0 | if ( !p2m_is_grant(type) || mfn_x(old_mfn) != frame ) |
64 | 0 | { |
65 | 0 | put_gfn(d, gfn); |
66 | 0 | gdprintk(XENLOG_WARNING, |
67 | 0 | "old mapping invalid (type %d, mfn %" PRI_mfn ", frame %lx)\n", |
68 | 0 | type, mfn_x(old_mfn), frame); |
69 | 0 | return GNTST_general_error; |
70 | 0 | } |
71 | 0 | if ( guest_physmap_remove_page(d, _gfn(gfn), _mfn(frame), PAGE_ORDER_4K) ) |
72 | 0 | { |
73 | 0 | put_gfn(d, gfn); |
74 | 0 | return GNTST_general_error; |
75 | 0 | } |
76 | 0 |
|
77 | 0 | put_gfn(d, gfn); |
78 | 0 | return GNTST_okay; |
79 | 0 | } |
80 | | |
81 | | /* |
82 | | * Local variables: |
83 | | * mode: C |
84 | | * c-file-style: "BSD" |
85 | | * c-basic-offset: 4 |
86 | | * tab-width: 4 |
87 | | * indent-tabs-mode: nil |
88 | | * End: |
89 | | */ |