| #ifndef _LINUX_VIRTIO_BALLOON_H |
| #define _LINUX_VIRTIO_BALLOON_H |
| /* This header is BSD licensed so anyone can use the definitions to implement |
| * compatible drivers/servers. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of IBM nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. */ |
| #include <linux/types.h> |
| #include <linux/virtio_types.h> |
| #include <linux/virtio_ids.h> |
| #include <linux/virtio_config.h> |
| |
| /* The feature bitmap for virtio balloon */ |
| #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ |
| #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ |
| #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ |
| #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ |
| #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ |
| #define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ |
| #define VIRTIO_BALLOON_F_MIN_BALLOON_SIZE 6 /* Min balloon size to remain even with OOM event*/ |
| |
| /* Size of a PFN in the balloon interface. */ |
| #define VIRTIO_BALLOON_PFN_SHIFT 12 |
| |
| #define VIRTIO_BALLOON_CMD_ID_STOP 0 |
| #define VIRTIO_BALLOON_CMD_ID_DONE 1 |
| struct virtio_balloon_config { |
| /* Number of pages host wants Guest to give up. */ |
| __le32 num_pages; |
| /* Number of pages we've actually got in balloon. */ |
| __le32 actual; |
| /* |
| * Free page hint command id, readonly by guest. |
| * Was previously named free_page_report_cmd_id so we |
| * need to carry that name for legacy support. |
| */ |
| union { |
| __le32 free_page_hint_cmd_id; |
| __le32 free_page_report_cmd_id; /* deprecated */ |
| }; |
| /* Stores PAGE_POISON if page poisoning is in use */ |
| __le32 poison_val; |
| /* Number of Pages host wants Guest to give up even with delfate_on_oom event. */ |
| __le32 min_balloon_pages; |
| }; |
| |
| #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */ |
| #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */ |
| #define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */ |
| #define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */ |
| #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */ |
| #define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */ |
| #define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */ |
| #define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */ |
| #define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */ |
| #define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */ |
| #define VIRTIO_BALLOON_S_NR 10 |
| |
| #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \ |
| VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \ |
| VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \ |
| } |
| |
| #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("") |
| |
| /* |
| * Memory statistics structure. |
| * Driver fills an array of these structures and passes to device. |
| * |
| * NOTE: fields are laid out in a way that would make compiler add padding |
| * between and after fields, so we have to use compiler-specific attributes to |
| * pack it, to disable this padding. This also often causes compiler to |
| * generate suboptimal code. |
| * |
| * We maintain this statistics structure format for backwards compatibility, |
| * but don't follow this example. |
| * |
| * If implementing a similar structure, do something like the below instead: |
| * struct virtio_balloon_stat { |
| * __virtio16 tag; |
| * __u8 reserved[6]; |
| * __virtio64 val; |
| * }; |
| * |
| * In other words, add explicit reserved fields to align field and |
| * structure boundaries at field size, avoiding compiler padding |
| * without the packed attribute. |
| */ |
| struct virtio_balloon_stat { |
| __virtio16 tag; |
| __virtio64 val; |
| } __attribute__((packed)); |
| |
| #endif /* _LINUX_VIRTIO_BALLOON_H */ |