4 * Copyright (C) 2020 Red Hat, Inc.
7 * David Hildenbrand <david@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2.
10 * See the COPYING file in the top-level directory.
13 #ifndef HW_VIRTIO_MEM_H
14 #define HW_VIRTIO_MEM_H
16 #include "standard-headers/linux/virtio_mem.h"
17 #include "hw/virtio/virtio.h"
18 #include "qapi/qapi-types-misc.h"
19 #include "sysemu/hostmem.h"
21 #define TYPE_VIRTIO_MEM "virtio-mem"
23 #define VIRTIO_MEM(obj) \
24 OBJECT_CHECK(VirtIOMEM, (obj), TYPE_VIRTIO_MEM)
25 #define VIRTIO_MEM_CLASS(oc) \
26 OBJECT_CLASS_CHECK(VirtIOMEMClass, (oc), TYPE_VIRTIO_MEM)
27 #define VIRTIO_MEM_GET_CLASS(obj) \
28 OBJECT_GET_CLASS(VirtIOMEMClass, (obj), TYPE_VIRTIO_MEM)
30 #define VIRTIO_MEM_MEMDEV_PROP "memdev"
31 #define VIRTIO_MEM_NODE_PROP "node"
32 #define VIRTIO_MEM_SIZE_PROP "size"
33 #define VIRTIO_MEM_REQUESTED_SIZE_PROP "requested-size"
34 #define VIRTIO_MEM_BLOCK_SIZE_PROP "block-size"
35 #define VIRTIO_MEM_ADDR_PROP "memaddr"
37 typedef struct VirtIOMEM
{
38 VirtIODevice parent_obj
;
40 /* guest -> host request queue */
43 /* bitmap used to track unplugged memory */
45 unsigned long *bitmap
;
47 /* assigned memory backend and memory region */
48 HostMemoryBackend
*memdev
;
53 /* assigned address of the region in guest physical memory */
56 /* usable region size (<= region_size) */
57 uint64_t usable_region_size
;
59 /* actual size (how much the guest plugged) */
63 uint64_t requested_size
;
65 /* block size and alignment */
68 /* notifiers to notify when "size" changes */
69 NotifierList size_change_notifiers
;
72 typedef struct VirtIOMEMClass
{
77 void (*fill_device_info
)(const VirtIOMEM
*vmen
, VirtioMEMDeviceInfo
*vi
);
78 MemoryRegion
*(*get_memory_region
)(VirtIOMEM
*vmem
, Error
**errp
);
79 void (*add_size_change_notifier
)(VirtIOMEM
*vmem
, Notifier
*notifier
);
80 void (*remove_size_change_notifier
)(VirtIOMEM
*vmem
, Notifier
*notifier
);