1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2016 Flavius Anton
5 * Copyright (c) 2016 Mihai Tiganus
6 * Copyright (c) 2016-2019 Mihai Carabas
7 * Copyright (c) 2017-2019 Darius Mihai
8 * Copyright (c) 2017-2019 Elena Mihailescu
9 * Copyright (c) 2018-2019 Sergiu Weisz
10 * All rights reserved.
11 * The bhyve-snapshot feature was developed under sponsorships
12 * from Matthew Grooms.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/types.h>
37 #include <sys/systm.h>
38
39 #include <machine/vmm_snapshot.h>
40
41 void
vm_snapshot_buf_err(const char * bufname,const enum vm_snapshot_op op)42 vm_snapshot_buf_err(const char *bufname, const enum vm_snapshot_op op)
43 {
44 const char *opstr;
45
46 if (op == VM_SNAPSHOT_SAVE)
47 opstr = "save";
48 else if (op == VM_SNAPSHOT_RESTORE)
49 opstr = "restore";
50 else
51 opstr = "unknown";
52
53 printf("%s: snapshot-%s failed for %s\r\n", __func__, opstr, bufname);
54 }
55
56 int
vm_snapshot_buf(void * data,size_t data_size,struct vm_snapshot_meta * meta)57 vm_snapshot_buf(void *data, size_t data_size, struct vm_snapshot_meta *meta)
58 {
59 struct vm_snapshot_buffer *buffer;
60 int op, error;
61
62 buffer = &meta->buffer;
63 op = meta->op;
64
65 if (buffer->buf_rem < data_size) {
66 printf("%s: buffer too small\r\n", __func__);
67 return (E2BIG);
68 }
69
70 if (op == VM_SNAPSHOT_SAVE)
71 error = copyout(data, buffer->buf, data_size);
72 else if (op == VM_SNAPSHOT_RESTORE)
73 error = copyin(buffer->buf, data, data_size);
74 else
75 error = EINVAL;
76
77 if (error)
78 return (error);
79
80 buffer->buf += data_size;
81 buffer->buf_rem -= data_size;
82
83 return (0);
84 }
85
86 size_t
vm_get_snapshot_size(struct vm_snapshot_meta * meta)87 vm_get_snapshot_size(struct vm_snapshot_meta *meta)
88 {
89 size_t length;
90 struct vm_snapshot_buffer *buffer;
91
92 buffer = &meta->buffer;
93
94 if (buffer->buf_size < buffer->buf_rem) {
95 printf("%s: Invalid buffer: size = %zu, rem = %zu\r\n",
96 __func__, buffer->buf_size, buffer->buf_rem);
97 length = 0;
98 } else {
99 length = buffer->buf_size - buffer->buf_rem;
100 }
101
102 return (length);
103 }
104