/root/src/xen/xen/arch/x86/mm/mem_paging.c
Line | Count | Source (jump to first uncovered line) |
1 | | /****************************************************************************** |
2 | | * arch/x86/mm/mem_paging.c |
3 | | * |
4 | | * Memory paging support. |
5 | | * |
6 | | * Copyright (c) 2009 Citrix Systems, Inc. (Patrick Colp) |
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 | | |
23 | | #include <asm/p2m.h> |
24 | | #include <xen/guest_access.h> |
25 | | #include <xen/vm_event.h> |
26 | | #include <xsm/xsm.h> |
27 | | |
28 | | int mem_paging_memop(XEN_GUEST_HANDLE_PARAM(xen_mem_paging_op_t) arg) |
29 | 0 | { |
30 | 0 | int rc; |
31 | 0 | xen_mem_paging_op_t mpo; |
32 | 0 | struct domain *d; |
33 | 0 | bool_t copyback = 0; |
34 | 0 |
|
35 | 0 | if ( copy_from_guest(&mpo, arg, 1) ) |
36 | 0 | return -EFAULT; |
37 | 0 |
|
38 | 0 | rc = rcu_lock_live_remote_domain_by_id(mpo.domain, &d); |
39 | 0 | if ( rc ) |
40 | 0 | return rc; |
41 | 0 |
|
42 | 0 | rc = xsm_mem_paging(XSM_DM_PRIV, d); |
43 | 0 | if ( rc ) |
44 | 0 | goto out; |
45 | 0 |
|
46 | 0 | rc = -ENODEV; |
47 | 0 | if ( unlikely(!vm_event_check_ring(d->vm_event_paging)) ) |
48 | 0 | goto out; |
49 | 0 |
|
50 | 0 | switch( mpo.op ) |
51 | 0 | { |
52 | 0 | case XENMEM_paging_op_nominate: |
53 | 0 | rc = p2m_mem_paging_nominate(d, mpo.gfn); |
54 | 0 | break; |
55 | 0 |
|
56 | 0 | case XENMEM_paging_op_evict: |
57 | 0 | rc = p2m_mem_paging_evict(d, mpo.gfn); |
58 | 0 | break; |
59 | 0 |
|
60 | 0 | case XENMEM_paging_op_prep: |
61 | 0 | rc = p2m_mem_paging_prep(d, mpo.gfn, mpo.buffer); |
62 | 0 | if ( !rc ) |
63 | 0 | copyback = 1; |
64 | 0 | break; |
65 | 0 |
|
66 | 0 | default: |
67 | 0 | rc = -ENOSYS; |
68 | 0 | break; |
69 | 0 | } |
70 | 0 |
|
71 | 0 | if ( copyback && __copy_to_guest(arg, &mpo, 1) ) |
72 | 0 | rc = -EFAULT; |
73 | 0 |
|
74 | 0 | out: |
75 | 0 | rcu_unlock_domain(d); |
76 | 0 | return rc; |
77 | 0 | } |
78 | | |
79 | | |
80 | | /* |
81 | | * Local variables: |
82 | | * mode: C |
83 | | * c-file-style: "BSD" |
84 | | * c-basic-offset: 4 |
85 | | * indent-tabs-mode: nil |
86 | | * End: |
87 | | */ |