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