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 "hw/virtio/virtio.h" 19 #include "hw/pci/pci.h" 20 21 #define TYPE_VIRTIO_BALLOON "virtio-balloon-device" 22 #define VIRTIO_BALLOON(obj) \ 23 OBJECT_CHECK(VirtIOBalloon, (obj), TYPE_VIRTIO_BALLOON) 24 25 /* from Linux's linux/virtio_balloon.h */ 26 27 /* The ID for virtio_balloon */ 28 #define VIRTIO_ID_BALLOON 5 29 30 /* The feature bitmap for virtio balloon */ 31 #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ 32 #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory stats virtqueue */ 33 34 /* Size of a PFN in the balloon interface. */ 35 #define VIRTIO_BALLOON_PFN_SHIFT 12 36 37 struct virtio_balloon_config 38 { 39 /* Number of pages host wants Guest to give up. */ 40 uint32_t num_pages; 41 /* Number of pages we've actually got in balloon. */ 42 uint32_t actual; 43 }; 44 45 /* Memory Statistics */ 46 #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */ 47 #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */ 48 #define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */ 49 #define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */ 50 #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */ 51 #define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */ 52 #define VIRTIO_BALLOON_S_NR 6 53 54 typedef struct VirtIOBalloonStat { 55 uint16_t tag; 56 uint64_t val; 57 } QEMU_PACKED VirtIOBalloonStat; 58 59 typedef struct VirtIOBalloon { 60 VirtIODevice parent_obj; 61 VirtQueue *ivq, *dvq, *svq; 62 uint32_t num_pages; 63 uint32_t actual; 64 uint64_t stats[VIRTIO_BALLOON_S_NR]; 65 VirtQueueElement stats_vq_elem; 66 size_t stats_vq_offset; 67 QEMUTimer *stats_timer; 68 int64_t stats_last_update; 69 int64_t stats_poll_interval; 70 } VirtIOBalloon; 71 72 #endif 73