1 /******************************************************************************
2 *
3 * tools/libxc/xc_mem_paging.c
4 *
5 * Interface to low-level memory paging functionality.
6 *
7 * Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "xc_private.h"
24
xc_mem_paging_memop(xc_interface * xch,uint32_t domain_id,unsigned int op,uint64_t gfn,void * buffer)25 static int xc_mem_paging_memop(xc_interface *xch, uint32_t domain_id,
26 unsigned int op, uint64_t gfn, void *buffer)
27 {
28 xen_mem_paging_op_t mpo;
29
30 memset(&mpo, 0, sizeof(mpo));
31
32 mpo.op = op;
33 mpo.domain = domain_id;
34 mpo.gfn = gfn;
35 mpo.buffer = (unsigned long) buffer;
36
37 return do_memory_op(xch, XENMEM_paging_op, &mpo, sizeof(mpo));
38 }
39
xc_mem_paging_enable(xc_interface * xch,uint32_t domain_id,uint32_t * port)40 int xc_mem_paging_enable(xc_interface *xch, uint32_t domain_id,
41 uint32_t *port)
42 {
43 if ( !port )
44 {
45 errno = EINVAL;
46 return -1;
47 }
48
49 return xc_vm_event_control(xch, domain_id,
50 XEN_VM_EVENT_ENABLE,
51 XEN_DOMCTL_VM_EVENT_OP_PAGING,
52 port);
53 }
54
xc_mem_paging_disable(xc_interface * xch,uint32_t domain_id)55 int xc_mem_paging_disable(xc_interface *xch, uint32_t domain_id)
56 {
57 return xc_vm_event_control(xch, domain_id,
58 XEN_VM_EVENT_DISABLE,
59 XEN_DOMCTL_VM_EVENT_OP_PAGING,
60 NULL);
61 }
62
xc_mem_paging_resume(xc_interface * xch,uint32_t domain_id)63 int xc_mem_paging_resume(xc_interface *xch, uint32_t domain_id)
64 {
65 return xc_vm_event_control(xch, domain_id,
66 XEN_VM_EVENT_RESUME,
67 XEN_DOMCTL_VM_EVENT_OP_PAGING,
68 NULL);
69 }
70
xc_mem_paging_nominate(xc_interface * xch,uint32_t domain_id,uint64_t gfn)71 int xc_mem_paging_nominate(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
72 {
73 return xc_mem_paging_memop(xch, domain_id,
74 XENMEM_paging_op_nominate,
75 gfn, NULL);
76 }
77
xc_mem_paging_evict(xc_interface * xch,uint32_t domain_id,uint64_t gfn)78 int xc_mem_paging_evict(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
79 {
80 return xc_mem_paging_memop(xch, domain_id,
81 XENMEM_paging_op_evict,
82 gfn, NULL);
83 }
84
xc_mem_paging_prep(xc_interface * xch,uint32_t domain_id,uint64_t gfn)85 int xc_mem_paging_prep(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
86 {
87 return xc_mem_paging_memop(xch, domain_id,
88 XENMEM_paging_op_prep,
89 gfn, NULL);
90 }
91
xc_mem_paging_load(xc_interface * xch,uint32_t domain_id,uint64_t gfn,void * buffer)92 int xc_mem_paging_load(xc_interface *xch, uint32_t domain_id,
93 uint64_t gfn, void *buffer)
94 {
95 int rc, old_errno;
96
97 errno = EINVAL;
98
99 if ( !buffer )
100 return -1;
101
102 if ( ((unsigned long) buffer) & (XC_PAGE_SIZE - 1) )
103 return -1;
104
105 if ( mlock(buffer, XC_PAGE_SIZE) )
106 return -1;
107
108 rc = xc_mem_paging_memop(xch, domain_id,
109 XENMEM_paging_op_prep,
110 gfn, buffer);
111
112 old_errno = errno;
113 munlock(buffer, XC_PAGE_SIZE);
114 errno = old_errno;
115
116 return rc;
117 }
118
119
120 /*
121 * Local variables:
122 * mode: C
123 * c-file-style: "BSD"
124 * c-basic-offset: 4
125 * indent-tabs-mode: nil
126 * End:
127 */
128