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