qemu

FORK: QEMU emulator
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virtio-mem.h (2562B)

      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 #define VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP "unplugged-inaccessible"
     34 #define VIRTIO_MEM_PREALLOC_PROP "prealloc"
     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     /*
     68      * Whether we indicate VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE to the guest.
     69      * For !x86 targets this will always be "on" and consequently indicate
     70      * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE.
     71      */
     72     OnOffAuto unplugged_inaccessible;
     73 
     74     /* whether to prealloc memory when plugging new blocks */
     75     bool prealloc;
     76 
     77     /* notifiers to notify when "size" changes */
     78     NotifierList size_change_notifiers;
     79 
     80     /* listeners to notify on plug/unplug activity. */
     81     QLIST_HEAD(, RamDiscardListener) rdl_list;
     82 };
     83 
     84 struct VirtIOMEMClass {
     85     /* private */
     86     VirtIODevice parent;
     87 
     88     /* public */
     89     void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi);
     90     MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp);
     91     void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
     92     void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
     93 };
     94 
     95 #endif