xref: /qemu/include/hw/virtio/virtio-balloon.h (revision d1368344bc9bb251080507940f2bad16048d2687)
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/resettable.h"
20  #include "hw/virtio/virtio.h"
21  #include "system/iothread.h"
22  #include "qom/object.h"
23  
24  #define TYPE_VIRTIO_BALLOON "virtio-balloon-device"
25  OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBalloon, VIRTIO_BALLOON)
26  
27  #define VIRTIO_BALLOON_FREE_PAGE_HINT_CMD_ID_MIN 0x80000000
28  
29  typedef struct virtio_balloon_stat VirtIOBalloonStat;
30  
31  typedef struct virtio_balloon_stat_modern {
32         uint16_t tag;
33         uint8_t reserved[6];
34         uint64_t val;
35  } VirtIOBalloonStatModern;
36  
37  enum virtio_balloon_free_page_hint_status {
38      FREE_PAGE_HINT_S_STOP = 0,
39      FREE_PAGE_HINT_S_REQUESTED = 1,
40      FREE_PAGE_HINT_S_START = 2,
41      FREE_PAGE_HINT_S_DONE = 3,
42  };
43  
44  struct VirtIOBalloon {
45      VirtIODevice parent_obj;
46      VirtQueue *ivq, *dvq, *svq, *free_page_vq, *reporting_vq;
47      uint32_t free_page_hint_status;
48      uint32_t num_pages;
49      uint32_t actual;
50      uint32_t free_page_hint_cmd_id;
51      uint64_t stats[VIRTIO_BALLOON_S_NR];
52      VirtQueueElement *stats_vq_elem;
53      size_t stats_vq_offset;
54      QEMUTimer *stats_timer;
55      IOThread *iothread;
56      QEMUBH *free_page_bh;
57      /*
58       * Lock to synchronize threads to access the free page reporting related
59       * fields (e.g. free_page_hint_status).
60       */
61      QemuMutex free_page_lock;
62      QemuCond  free_page_cond;
63      /*
64       * Set to block iothread to continue reading free page hints as the VM is
65       * stopped.
66       */
67      bool block_iothread;
68      NotifierWithReturn free_page_hint_notify;
69      int64_t stats_last_update;
70      int64_t stats_poll_interval;
71      uint32_t host_features;
72  
73      bool qemu_4_0_config_size;
74      uint32_t poison_val;
75  
76      /* State of the resettable container */
77      ResettableState reset_state;
78  };
79  
80  #endif
81