1 /*
2  * Virtio MEM device
3  *
4  * Copyright (C) 2020 Red Hat, Inc.
5  *
6  * Authors:
7  *  David Hildenbrand <david@redhat.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2.
10  * See the COPYING file in the top-level directory.
11  */
12 
13 #ifndef HW_VIRTIO_MEM_H
14 #define HW_VIRTIO_MEM_H
15 
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"
20 #include "qom/object.h"
21 
22 #define TYPE_VIRTIO_MEM "virtio-mem"
23 
24 OBJECT_DECLARE_TYPE(VirtIOMEM, VirtIOMEMClass,
25                     VIRTIO_MEM)
26 
27 #define VIRTIO_MEM_MEMDEV_PROP "memdev"
28 #define VIRTIO_MEM_NODE_PROP "node"
29 #define VIRTIO_MEM_SIZE_PROP "size"
30 #define VIRTIO_MEM_REQUESTED_SIZE_PROP "requested-size"
31 #define VIRTIO_MEM_BLOCK_SIZE_PROP "block-size"
32 #define VIRTIO_MEM_ADDR_PROP "memaddr"
33 
34 struct VirtIOMEM {
35     VirtIODevice parent_obj;
36 
37     /* guest -> host request queue */
38     VirtQueue *vq;
39 
40     /* bitmap used to track unplugged memory */
41     int32_t bitmap_size;
42     unsigned long *bitmap;
43 
44     /* assigned memory backend and memory region */
45     HostMemoryBackend *memdev;
46 
47     /* NUMA node */
48     uint32_t node;
49 
50     /* assigned address of the region in guest physical memory */
51     uint64_t addr;
52 
53     /* usable region size (<= region_size) */
54     uint64_t usable_region_size;
55 
56     /* actual size (how much the guest plugged) */
57     uint64_t size;
58 
59     /* requested size */
60     uint64_t requested_size;
61 
62     /* block size and alignment */
63     uint64_t block_size;
64 
65     /* notifiers to notify when "size" changes */
66     NotifierList size_change_notifiers;
67 
68     /* don't migrate unplugged memory */
69     NotifierWithReturn precopy_notifier;
70 
71     /* listeners to notify on plug/unplug activity. */
72     QLIST_HEAD(, RamDiscardListener) rdl_list;
73 };
74 
75 struct VirtIOMEMClass {
76     /* private */
77     VirtIODevice parent;
78 
79     /* public */
80     void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi);
81     MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp);
82     void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
83     void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
84 };
85 
86 #endif
87