1607ca46eSDavid Howells #ifndef _LINUX_VIRTIO_BALLOON_H 2607ca46eSDavid Howells #define _LINUX_VIRTIO_BALLOON_H 3607ca46eSDavid Howells /* This header is BSD licensed so anyone can use the definitions to implement 4607ca46eSDavid Howells * compatible drivers/servers. 5607ca46eSDavid Howells * 6607ca46eSDavid Howells * Redistribution and use in source and binary forms, with or without 7607ca46eSDavid Howells * modification, are permitted provided that the following conditions 8607ca46eSDavid Howells * are met: 9607ca46eSDavid Howells * 1. Redistributions of source code must retain the above copyright 10607ca46eSDavid Howells * notice, this list of conditions and the following disclaimer. 11607ca46eSDavid Howells * 2. Redistributions in binary form must reproduce the above copyright 12607ca46eSDavid Howells * notice, this list of conditions and the following disclaimer in the 13607ca46eSDavid Howells * documentation and/or other materials provided with the distribution. 14607ca46eSDavid Howells * 3. Neither the name of IBM nor the names of its contributors 15607ca46eSDavid Howells * may be used to endorse or promote products derived from this software 16607ca46eSDavid Howells * without specific prior written permission. 17607ca46eSDavid Howells * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND 18607ca46eSDavid Howells * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19607ca46eSDavid Howells * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20607ca46eSDavid Howells * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE 21607ca46eSDavid Howells * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22607ca46eSDavid Howells * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23607ca46eSDavid Howells * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24607ca46eSDavid Howells * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25607ca46eSDavid Howells * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26607ca46eSDavid Howells * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27607ca46eSDavid Howells * SUCH DAMAGE. */ 28df81b29cSMichael S. Tsirkin #include <linux/types.h> 298a7b19d8SMikko Rapeli #include <linux/virtio_types.h> 30607ca46eSDavid Howells #include <linux/virtio_ids.h> 31607ca46eSDavid Howells #include <linux/virtio_config.h> 32607ca46eSDavid Howells 33607ca46eSDavid Howells /* The feature bitmap for virtio balloon */ 34607ca46eSDavid Howells #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ 35607ca46eSDavid Howells #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ 365a10b7dbSRaushaniya Maksudova #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ 3786a55978SWei Wang #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ 382e991629SWei Wang #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ 39b0c504f1SAlexander Duyck #define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ 40607ca46eSDavid Howells 41607ca46eSDavid Howells /* Size of a PFN in the balloon interface. */ 42607ca46eSDavid Howells #define VIRTIO_BALLOON_PFN_SHIFT 12 43607ca46eSDavid Howells 4486a55978SWei Wang #define VIRTIO_BALLOON_CMD_ID_STOP 0 4586a55978SWei Wang #define VIRTIO_BALLOON_CMD_ID_DONE 1 4625e65e4eSMichael S. Tsirkin struct virtio_balloon_config { 47607ca46eSDavid Howells /* Number of pages host wants Guest to give up. */ 48*c73cb10cSMichael S. Tsirkin __le32 num_pages; 49607ca46eSDavid Howells /* Number of pages we've actually got in balloon. */ 50*c73cb10cSMichael S. Tsirkin __le32 actual; 5131ba514bSAlexander Duyck /* 5231ba514bSAlexander Duyck * Free page hint command id, readonly by guest. 5331ba514bSAlexander Duyck * Was previously named free_page_report_cmd_id so we 5431ba514bSAlexander Duyck * need to carry that name for legacy support. 5531ba514bSAlexander Duyck */ 5631ba514bSAlexander Duyck union { 57*c73cb10cSMichael S. Tsirkin __le32 free_page_hint_cmd_id; 58*c73cb10cSMichael S. Tsirkin __le32 free_page_report_cmd_id; /* deprecated */ 5931ba514bSAlexander Duyck }; 602e991629SWei Wang /* Stores PAGE_POISON if page poisoning is in use */ 61*c73cb10cSMichael S. Tsirkin __le32 poison_val; 62607ca46eSDavid Howells }; 63607ca46eSDavid Howells 64607ca46eSDavid Howells #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */ 65607ca46eSDavid Howells #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */ 66607ca46eSDavid Howells #define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */ 67607ca46eSDavid Howells #define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */ 68607ca46eSDavid Howells #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */ 69607ca46eSDavid Howells #define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */ 705057dcd0SIgor Redko #define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */ 714d32029bSTomáš Golembiovský #define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */ 726c64fe7fSJonathan Helman #define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */ 736c64fe7fSJonathan Helman #define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */ 746c64fe7fSJonathan Helman #define VIRTIO_BALLOON_S_NR 10 75607ca46eSDavid Howells 76b4000032SMichael S. Tsirkin #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \ 77b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \ 78b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \ 79b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \ 80b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \ 81b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \ 82b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \ 83b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \ 84b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \ 85b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \ 86b4000032SMichael S. Tsirkin VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \ 87b4000032SMichael S. Tsirkin } 88b4000032SMichael S. Tsirkin 89b4000032SMichael S. Tsirkin #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("") 90b4000032SMichael S. Tsirkin 91df81b29cSMichael S. Tsirkin /* 92df81b29cSMichael S. Tsirkin * Memory statistics structure. 93df81b29cSMichael S. Tsirkin * Driver fills an array of these structures and passes to device. 94df81b29cSMichael S. Tsirkin * 95df81b29cSMichael S. Tsirkin * NOTE: fields are laid out in a way that would make compiler add padding 96df81b29cSMichael S. Tsirkin * between and after fields, so we have to use compiler-specific attributes to 97df81b29cSMichael S. Tsirkin * pack it, to disable this padding. This also often causes compiler to 98df81b29cSMichael S. Tsirkin * generate suboptimal code. 99df81b29cSMichael S. Tsirkin * 100df81b29cSMichael S. Tsirkin * We maintain this statistics structure format for backwards compatibility, 101df81b29cSMichael S. Tsirkin * but don't follow this example. 102df81b29cSMichael S. Tsirkin * 103df81b29cSMichael S. Tsirkin * If implementing a similar structure, do something like the below instead: 104df81b29cSMichael S. Tsirkin * struct virtio_balloon_stat { 105df81b29cSMichael S. Tsirkin * __virtio16 tag; 106df81b29cSMichael S. Tsirkin * __u8 reserved[6]; 107df81b29cSMichael S. Tsirkin * __virtio64 val; 108df81b29cSMichael S. Tsirkin * }; 109df81b29cSMichael S. Tsirkin * 110df81b29cSMichael S. Tsirkin * In other words, add explicit reserved fields to align field and 111df81b29cSMichael S. Tsirkin * structure boundaries at field size, avoiding compiler padding 112df81b29cSMichael S. Tsirkin * without the packed attribute. 113df81b29cSMichael S. Tsirkin */ 114607ca46eSDavid Howells struct virtio_balloon_stat { 115df81b29cSMichael S. Tsirkin __virtio16 tag; 116df81b29cSMichael S. Tsirkin __virtio64 val; 117607ca46eSDavid Howells } __attribute__((packed)); 118607ca46eSDavid Howells 119607ca46eSDavid Howells #endif /* _LINUX_VIRTIO_BALLOON_H */ 120