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01: #ifndef _LINUX_VIRTIO_BALLOON_H
02: #define _LINUX_VIRTIO_BALLOON_H
03: /* This header is BSD licensed so anyone can use the definitions to implement
04:  * compatible drivers/servers.
05:  *
06:  * Redistribution and use in source and binary forms, with or without
07:  * modification, are permitted provided that the following conditions
08:  * are met:
09:  * 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: 
38: struct virtio_balloon_config
39: {
40:         /* Number of pages host wants Guest to give up. */
41:         __le32 num_pages;
42:         /* Number of pages we've actually got in balloon. */
43:         __le32 actual;
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: 
54: struct virtio_balloon_stat {
55:         u16 tag;
56:         u64 val;
57: } __attribute__((packed));
58: 
59: #endif /* _LINUX_VIRTIO_BALLOON_H */
60: 

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