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119 lines
5.2 KiB
119 lines
5.2 KiB
#ifndef _LINUX_VIRTIO_BALLOON_H |
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#define _LINUX_VIRTIO_BALLOON_H |
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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 ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* 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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#include <linux/types.h> |
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#include <linux/virtio_types.h> |
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#include <linux/virtio_ids.h> |
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#include <linux/virtio_config.h> |
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/* The feature bitmap for virtio balloon */ |
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#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ |
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#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ |
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#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ |
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#define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ |
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#define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ |
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#define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ |
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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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#define VIRTIO_BALLOON_CMD_ID_STOP 0 |
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#define VIRTIO_BALLOON_CMD_ID_DONE 1 |
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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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__le32 num_pages; |
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/* Number of pages we've actually got in balloon. */ |
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__le32 actual; |
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/* |
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* Free page hint command id, readonly by guest. |
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* Was previously named free_page_report_cmd_id so we |
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* need to carry that name for legacy support. |
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*/ |
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union { |
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__le32 free_page_hint_cmd_id; |
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__le32 free_page_report_cmd_id; /* deprecated */ |
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}; |
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/* Stores PAGE_POISON if page poisoning is in use */ |
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__le32 poison_val; |
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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_HTLB_PGALLOC 8 /* Hugetlb page allocations */ |
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#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */ |
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#define VIRTIO_BALLOON_S_NR 10 |
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#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \ |
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VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \ |
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \ |
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} |
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#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("") |
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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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__virtio16 tag; |
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__virtio64 val; |
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} __attribute__((packed)); |
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#endif /* _LINUX_VIRTIO_BALLOON_H */
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