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90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_BALLOON_H
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#define _VIRTIO_BALLOON_H
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/* Feature bits. */
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#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0x1 /* Tell before reclaiming pages */
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#define VIRTIO_BALLOON_F_STATS_VQ 0x2 /* Memory stats virtqueue */
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#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 0x4 /* Deflate balloon on OOM */
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/* Size of a PFN in the balloon interface. */
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#define VIRTIO_BALLOON_PFN_SHIFT 12
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struct virtio_balloon_config {
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/* Number of pages host wants Guest to give up. */
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uint32_t num_pages;
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/* Number of pages we've actually got in balloon. */
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uint32_t actual;
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};
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#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
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#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
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#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
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#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
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#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
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#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
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#define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
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#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
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#define VIRTIO_BALLOON_S_NR 8
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/*
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* Memory statistics structure.
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* Driver fills an array of these structures and passes to device.
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*
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* NOTE: fields are laid out in a way that would make compiler add padding
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* between and after fields, so we have to use compiler-specific attributes to
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* pack it, to disable this padding. This also often causes compiler to
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* generate suboptimal code.
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*
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* We maintain this statistics structure format for backwards compatibility,
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* but don't follow this example.
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*
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* If implementing a similar structure, do something like the below instead:
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* struct virtio_balloon_stat {
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* __virtio16 tag;
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* __u8 reserved[6];
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* __virtio64 val;
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* };
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*
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* In other words, add explicit reserved fields to align field and
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* structure boundaries at field size, avoiding compiler padding
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* without the packed attribute.
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*/
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struct virtio_balloon_stat {
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uint16_t tag;
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uint64_t val;
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} __packed;
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#endif /* _VIRTIO_BALLOON_H */
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