1/*-
2 * This header is BSD licensed so anyone can use the definitions to implement
3 * compatible drivers/servers.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of IBM nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef _VIRTIO_BALLOON_H
32#define _VIRTIO_BALLOON_H
33
34/* Feature bits. */
35#define VIRTIO_BALLOON_F_MUST_TELL_HOST	0x1 /* Tell before reclaiming pages */
36#define VIRTIO_BALLOON_F_STATS_VQ	0x2 /* Memory stats virtqueue */
37
38/* Size of a PFN in the balloon interface. */
39#define VIRTIO_BALLOON_PFN_SHIFT 12
40
41struct virtio_balloon_config {
42	/* Number of pages host wants Guest to give up. */
43	uint32_t num_pages;
44
45	/* Number of pages we've actually got in balloon. */
46	uint32_t actual;
47};
48
49#define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */
50#define VIRTIO_BALLOON_S_SWAP_OUT 1   /* Amount of memory swapped out */
51#define VIRTIO_BALLOON_S_MAJFLT   2   /* Number of major faults */
52#define VIRTIO_BALLOON_S_MINFLT   3   /* Number of minor faults */
53#define VIRTIO_BALLOON_S_MEMFREE  4   /* Total amount of free memory */
54#define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
55#define VIRTIO_BALLOON_S_NR       6
56
57struct virtio_balloon_stat {
58	uint16_t tag;
59	uint64_t val;
60} __packed;
61
62#endif /* _VIRTIO_BALLOON_H */
63