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 41 struct 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 57 struct virtio_balloon_stat { 58 uint16_t tag; 59 uint64_t val; 60 } __packed; 61 62 #endif /* _VIRTIO_BALLOON_H */ 63