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
mem_paging_memop(XEN_GUEST_HANDLE_PARAM (xen_mem_paging_op_t)arg)28 int mem_paging_memop(XEN_GUEST_HANDLE_PARAM(xen_mem_paging_op_t) arg)
29 {
30 int rc;
31 xen_mem_paging_op_t mpo;
32 struct domain *d;
33 bool_t copyback = 0;
34
35 if ( copy_from_guest(&mpo, arg, 1) )
36 return -EFAULT;
37
38 rc = rcu_lock_live_remote_domain_by_id(mpo.domain, &d);
39 if ( rc )
40 return rc;
41
42 rc = xsm_mem_paging(XSM_DM_PRIV, d);
43 if ( rc )
44 goto out;
45
46 rc = -ENODEV;
47 if ( unlikely(!vm_event_check_ring(d->vm_event_paging)) )
48 goto out;
49
50 switch( mpo.op )
51 {
52 case XENMEM_paging_op_nominate:
53 rc = p2m_mem_paging_nominate(d, mpo.gfn);
54 break;
55
56 case XENMEM_paging_op_evict:
57 rc = p2m_mem_paging_evict(d, mpo.gfn);
58 break;
59
60 case XENMEM_paging_op_prep:
61 rc = p2m_mem_paging_prep(d, mpo.gfn, mpo.buffer);
62 if ( !rc )
63 copyback = 1;
64 break;
65
66 default:
67 rc = -ENOSYS;
68 break;
69 }
70
71 if ( copyback && __copy_to_guest(arg, &mpo, 1) )
72 rc = -EFAULT;
73
74 out:
75 rcu_unlock_domain(d);
76 return rc;
77 }
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 */
88