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 typedef struct VirtIOMEM VirtIOMEM;
  25 typedef struct VirtIOMEMClass VirtIOMEMClass;
  26 DECLARE_OBJ_CHECKERS(VirtIOMEM, VirtIOMEMClass,
  27                      VIRTIO_MEM, TYPE_VIRTIO_MEM)
  28
  29 #define VIRTIO_MEM_MEMDEV_PROP "memdev"
  30 #define VIRTIO_MEM_NODE_PROP "node"
  31 #define VIRTIO_MEM_SIZE_PROP "size"
  32 #define VIRTIO_MEM_REQUESTED_SIZE_PROP "requested-size"
  33 #define VIRTIO_MEM_BLOCK_SIZE_PROP "block-size"
  34 #define VIRTIO_MEM_ADDR_PROP "memaddr"
  35
  36 struct VirtIOMEM {
  37     VirtIODevice parent_obj;
  38
  39     /* guest -> host request queue */
  40     VirtQueue *vq;
  41
  42     /* bitmap used to track unplugged memory */
  43     int32_t bitmap_size;
  44     unsigned long *bitmap;
  45
  46     /* assigned memory backend and memory region */
  47     HostMemoryBackend *memdev;
  48
  49     /* NUMA node */
  50     uint32_t node;
  51
  52     /* assigned address of the region in guest physical memory */
  53     uint64_t addr;
  54
  55     /* usable region size (<= region_size) */
  56     uint64_t usable_region_size;
  57
  58     /* actual size (how much the guest plugged) */
  59     uint64_t size;
  60
  61     /* requested size */
  62     uint64_t requested_size;
  63
  64     /* block size and alignment */
  65     uint64_t block_size;
  66
  67     /* notifiers to notify when "size" changes */
  68     NotifierList size_change_notifiers;
  69
  70     /* don't migrate unplugged memory */
  71     NotifierWithReturn precopy_notifier;
  72 };
  73
  74 struct VirtIOMEMClass {
  75     /* private */
  76     VirtIODevice parent;
  77
  78     /* public */
  79     void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi);
  80     MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp);
  81     void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
  82     void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
  83 };
  84
  85 #endif