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_HINT_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 enum virtio_balloon_free_page_hint_status {
37     FREE_PAGE_HINT_S_STOP = 0,
38     FREE_PAGE_HINT_S_REQUESTED = 1,
39     FREE_PAGE_HINT_S_START = 2,
40     FREE_PAGE_HINT_S_DONE = 3,
41 };
42 
43 typedef struct VirtIOBalloon {
44     VirtIODevice parent_obj;
45     VirtQueue *ivq, *dvq, *svq, *free_page_vq, *reporting_vq;
46     uint32_t free_page_hint_status;
47     uint32_t num_pages;
48     uint32_t actual;
49     uint32_t free_page_hint_cmd_id;
50     uint64_t stats[VIRTIO_BALLOON_S_NR];
51     VirtQueueElement *stats_vq_elem;
52     size_t stats_vq_offset;
53     QEMUTimer *stats_timer;
54     IOThread *iothread;
55     QEMUBH *free_page_bh;
56     /*
57      * Lock to synchronize threads to access the free page reporting related
58      * fields (e.g. free_page_hint_status).
59      */
60     QemuMutex free_page_lock;
61     QemuCond  free_page_cond;
62     /*
63      * Set to block iothread to continue reading free page hints as the VM is
64      * stopped.
65      */
66     bool block_iothread;
67     NotifierWithReturn free_page_hint_notify;
68     int64_t stats_last_update;
69     int64_t stats_poll_interval;
70     uint32_t host_features;
71 
72     bool qemu_4_0_config_size;
73     uint32_t poison_val;
74 } VirtIOBalloon;
75 
76 #endif
77