include/standard-headers/linux/virtio_balloon.h - qemu - Git at Google

 #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 "standard-headers/linux/types.h"
 #include "standard-headers/linux/virtio_types.h"
 #include "standard-headers/linux/virtio_ids.h"
 #include "standard-headers/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 */

 /* 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. */
 	uint32_t num_pages;
 	/* Number of pages we've actually got in balloon. */
 	uint32_t 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 {
 		uint32_t free_page_hint_cmd_id;
 		uint32_t free_page_report_cmd_id;	/* deprecated */
 	};
 	/* Stores PAGE_POISON if page poisoning is in use */
 	uint32_t poison_val;
 };

 #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_OOM_KILL      10 /* OOM killer invocations */
 #define VIRTIO_BALLOON_S_ALLOC_STALL   11 /* Stall count of memory allocatoin */
 #define VIRTIO_BALLOON_S_ASYNC_SCAN    12 /* Amount of memory scanned asynchronously */
 #define VIRTIO_BALLOON_S_DIRECT_SCAN   13 /* Amount of memory scanned directly */
 #define VIRTIO_BALLOON_S_ASYNC_RECLAIM 14 /* Amount of memory reclaimed asynchronously */
 #define VIRTIO_BALLOON_S_DIRECT_RECLAIM 15 /* Amount of memory reclaimed directly */
 #define VIRTIO_BALLOON_S_NR       16

 #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", \
 	VIRTIO_BALLOON_S_NAMES_prefix "oom-kills", \
 	VIRTIO_BALLOON_S_NAMES_prefix "alloc-stalls", \
 	VIRTIO_BALLOON_S_NAMES_prefix "async-scans", \
 	VIRTIO_BALLOON_S_NAMES_prefix "direct-scans", \
 	VIRTIO_BALLOON_S_NAMES_prefix "async-reclaims", \
 	VIRTIO_BALLOON_S_NAMES_prefix "direct-reclaims" \
 }

 #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;
  *         uint8_t 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;
 } QEMU_PACKED;

 #endif /* _LINUX_VIRTIO_BALLOON_H */
	#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 "standard-headers/linux/types.h"
	#include "standard-headers/linux/virtio_types.h"
	#include "standard-headers/linux/virtio_ids.h"
	#include "standard-headers/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 */

	/* 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. */
	uint32_t num_pages;
	/* Number of pages we've actually got in balloon. */
	uint32_t 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 {
	uint32_t free_page_hint_cmd_id;
	uint32_t free_page_report_cmd_id; /* deprecated */
	};
	/* Stores PAGE_POISON if page poisoning is in use */
	uint32_t poison_val;
	};

	#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_OOM_KILL 10 /* OOM killer invocations */
	#define VIRTIO_BALLOON_S_ALLOC_STALL 11 /* Stall count of memory allocatoin */
	#define VIRTIO_BALLOON_S_ASYNC_SCAN 12 /* Amount of memory scanned asynchronously */
	#define VIRTIO_BALLOON_S_DIRECT_SCAN 13 /* Amount of memory scanned directly */
	#define VIRTIO_BALLOON_S_ASYNC_RECLAIM 14 /* Amount of memory reclaimed asynchronously */
	#define VIRTIO_BALLOON_S_DIRECT_RECLAIM 15 /* Amount of memory reclaimed directly */
	#define VIRTIO_BALLOON_S_NR 16

	#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", \
	VIRTIO_BALLOON_S_NAMES_prefix "oom-kills", \
	VIRTIO_BALLOON_S_NAMES_prefix "alloc-stalls", \
	VIRTIO_BALLOON_S_NAMES_prefix "async-scans", \
	VIRTIO_BALLOON_S_NAMES_prefix "direct-scans", \
	VIRTIO_BALLOON_S_NAMES_prefix "async-reclaims", \
	VIRTIO_BALLOON_S_NAMES_prefix "direct-reclaims" \
	}

	#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;
	* uint8_t 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;
	} QEMU_PACKED;

	#endif /* _LINUX_VIRTIO_BALLOON_H */