include/hw/virtio/virtio-balloon.h

   1 /*
   2  * Virtio Support
   3  *
   4  * Copyright IBM, Corp. 2007-2008
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *  Rusty Russell     <rusty@rustcorp.com.au>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #ifndef QEMU_VIRTIO_BALLOON_H
  16 #define QEMU_VIRTIO_BALLOON_H
  17
  18 #include "standard-headers/linux/virtio_balloon.h"
  19 #include "hw/virtio/virtio.h"
  20 #include "sysemu/iothread.h"
  21
  22 #define TYPE_VIRTIO_BALLOON "virtio-balloon-device"
  23 #define VIRTIO_BALLOON(obj) \
  24         OBJECT_CHECK(VirtIOBalloon, (obj), TYPE_VIRTIO_BALLOON)
  25
  26 #define VIRTIO_BALLOON_FREE_PAGE_REPORT_CMD_ID_MIN 0x80000000
  27
  28 typedef struct virtio_balloon_stat VirtIOBalloonStat;
  29
  30 typedef struct virtio_balloon_stat_modern {
  31        uint16_t tag;
  32        uint8_t reserved[6];
  33        uint64_t val;
  34 } VirtIOBalloonStatModern;
  35
  36 typedef struct PartiallyBalloonedPage PartiallyBalloonedPage;
  37
  38 enum virtio_balloon_free_page_report_status {
  39     FREE_PAGE_REPORT_S_STOP = 0,
  40     FREE_PAGE_REPORT_S_REQUESTED = 1,
  41     FREE_PAGE_REPORT_S_START = 2,
  42     FREE_PAGE_REPORT_S_DONE = 3,
  43 };
  44
  45 typedef struct VirtIOBalloon {
  46     VirtIODevice parent_obj;
  47     VirtQueue *ivq, *dvq, *svq, *free_page_vq;
  48     uint32_t free_page_report_status;
  49     uint32_t num_pages;
  50     uint32_t actual;
  51     uint32_t free_page_report_cmd_id;
  52     uint64_t stats[VIRTIO_BALLOON_S_NR];
  53     VirtQueueElement *stats_vq_elem;
  54     size_t stats_vq_offset;
  55     QEMUTimer *stats_timer;
  56     IOThread *iothread;
  57     QEMUBH *free_page_bh;
  58     /*
  59      * Lock to synchronize threads to access the free page reporting related
  60      * fields (e.g. free_page_report_status).
  61      */
  62     QemuMutex free_page_lock;
  63     QemuCond  free_page_cond;
  64     /*
  65      * Set to block iothread to continue reading free page hints as the VM is
  66      * stopped.
  67      */
  68     bool block_iothread;
  69     NotifierWithReturn free_page_report_notify;
  70     int64_t stats_last_update;
  71     int64_t stats_poll_interval;
  72     uint32_t host_features;
  73     PartiallyBalloonedPage *pbp;
  74 } VirtIOBalloon;
  75
  76 #endif