| 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/core/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 | uint32_t poison_val; |
| 74 | |
| 75 | /* State of the resettable container */ |
| 76 | ResettableState reset_state; |
| 77 | }; |
| 78 | |
| 79 | #endif |