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