xref: /freebsd/sys/amd64/vmm/vmm_snapshot.c (revision db33c6f3ae9d1231087710068ee4ea5398aacca7)
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
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
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
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