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 DECLARE_HYPERCALL_BOUNCE(buffer, XC_PAGE_SIZE,
30 XC_HYPERCALL_BUFFER_BOUNCE_IN);
31 int rc;
32
33 memset(&mpo, 0, sizeof(mpo));
34
35 mpo.op = op;
36 mpo.domain = domain_id;
37 mpo.gfn = gfn;
38
39 if ( buffer )
40 {
41 if ( xc_hypercall_bounce_pre(xch, buffer) )
42 {
43 PERROR("Could not bounce memory for XENMEM_paging_op %u", op);
44 return -1;
45 }
46
47 set_xen_guest_handle(mpo.buffer, buffer);
48 }
49
50 rc = do_memory_op(xch, XENMEM_paging_op, &mpo, sizeof(mpo));
51
52 if ( buffer )
53 xc_hypercall_bounce_post(xch, buffer);
54
55 return rc;
56 }
57
xc_mem_paging_enable(xc_interface * xch,uint32_t domain_id,uint32_t * port)58 int xc_mem_paging_enable(xc_interface *xch, uint32_t domain_id,
59 uint32_t *port)
60 {
61 if ( !port )
62 {
63 errno = EINVAL;
64 return -1;
65 }
66
67 return xc_vm_event_control(xch, domain_id,
68 XEN_VM_EVENT_ENABLE,
69 XEN_DOMCTL_VM_EVENT_OP_PAGING,
70 port);
71 }
72
xc_mem_paging_disable(xc_interface * xch,uint32_t domain_id)73 int xc_mem_paging_disable(xc_interface *xch, uint32_t domain_id)
74 {
75 return xc_vm_event_control(xch, domain_id,
76 XEN_VM_EVENT_DISABLE,
77 XEN_DOMCTL_VM_EVENT_OP_PAGING,
78 NULL);
79 }
80
xc_mem_paging_resume(xc_interface * xch,uint32_t domain_id)81 int xc_mem_paging_resume(xc_interface *xch, uint32_t domain_id)
82 {
83 return xc_vm_event_control(xch, domain_id,
84 XEN_VM_EVENT_RESUME,
85 XEN_DOMCTL_VM_EVENT_OP_PAGING,
86 NULL);
87 }
88
xc_mem_paging_nominate(xc_interface * xch,uint32_t domain_id,uint64_t gfn)89 int xc_mem_paging_nominate(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
90 {
91 return xc_mem_paging_memop(xch, domain_id,
92 XENMEM_paging_op_nominate,
93 gfn, NULL);
94 }
95
xc_mem_paging_evict(xc_interface * xch,uint32_t domain_id,uint64_t gfn)96 int xc_mem_paging_evict(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
97 {
98 return xc_mem_paging_memop(xch, domain_id,
99 XENMEM_paging_op_evict,
100 gfn, NULL);
101 }
102
xc_mem_paging_prep(xc_interface * xch,uint32_t domain_id,uint64_t gfn)103 int xc_mem_paging_prep(xc_interface *xch, uint32_t domain_id, uint64_t gfn)
104 {
105 return xc_mem_paging_memop(xch, domain_id,
106 XENMEM_paging_op_prep,
107 gfn, NULL);
108 }
109
xc_mem_paging_load(xc_interface * xch,uint32_t domain_id,uint64_t gfn,void * buffer)110 int xc_mem_paging_load(xc_interface *xch, uint32_t domain_id,
111 uint64_t gfn, void *buffer)
112 {
113 errno = EINVAL;
114
115 if ( !buffer )
116 return -1;
117
118 return xc_mem_paging_memop(xch, domain_id, XENMEM_paging_op_prep,
119 gfn, buffer);
120 }
121
122
123 /*
124 * Local variables:
125 * mode: C
126 * c-file-style: "BSD"
127 * c-basic-offset: 4
128 * indent-tabs-mode: nil
129 * End:
130 */
131