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 86