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