include/hw/virtio/virtio-mem.h

   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