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