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_EARLY_MIGRATION_PROP "x-early-migration" 35 #define VIRTIO_MEM_PREALLOC_PROP "prealloc" 36 37 struct VirtIOMEM { 38 VirtIODevice parent_obj; 39 40 /* guest -> host request queue */ 41 VirtQueue *vq; 42 43 /* bitmap used to track unplugged memory */ 44 int32_t bitmap_size; 45 unsigned long *bitmap; 46 47 /* assigned memory backend and memory region */ 48 HostMemoryBackend *memdev; 49 50 /* NUMA node */ 51 uint32_t node; 52 53 /* assigned address of the region in guest physical memory */ 54 uint64_t addr; 55 56 /* usable region size (<= region_size) */ 57 uint64_t usable_region_size; 58 59 /* actual size (how much the guest plugged) */ 60 uint64_t size; 61 62 /* requested size */ 63 uint64_t requested_size; 64 65 /* block size and alignment */ 66 uint64_t block_size; 67 68 /* 69 * Whether we indicate VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE to the guest. 70 * For !x86 targets this will always be "on" and consequently indicate 71 * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. 72 */ 73 OnOffAuto unplugged_inaccessible; 74 75 /* whether to prealloc memory when plugging new blocks */ 76 bool prealloc; 77 78 /* 79 * Whether we migrate properties that are immutable while migration is 80 * active early, before state of other devices and especially, before 81 * migrating any RAM content. 82 */ 83 bool early_migration; 84 85 /* notifiers to notify when "size" changes */ 86 NotifierList size_change_notifiers; 87 88 /* listeners to notify on plug/unplug activity. */ 89 QLIST_HEAD(, RamDiscardListener) rdl_list; 90 }; 91 92 struct VirtIOMEMClass { 93 /* private */ 94 VirtIODevice parent; 95 96 /* public */ 97 void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi); 98 MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp); 99 void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier); 100 void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier); 101 }; 102 103 #endif 104