| 1 | /* |
| 2 | * QEMU Host Memory Backend |
| 3 | * |
| 4 | * Copyright (C) 2013-2014 Red Hat Inc |
| 5 | * |
| 6 | * Authors: |
| 7 | * Igor Mammedov <imammedo@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #ifndef SYSTEM_HOSTMEM_H |
| 14 | #define SYSTEM_HOSTMEM_H |
| 15 | |
| 16 | #include "system/numa.h" |
| 17 | #include "qapi/qapi-types-machine.h" |
| 18 | #include "qom/object.h" |
| 19 | #include "system/memory.h" |
| 20 | #include "qemu/bitmap.h" |
| 21 | #include "qemu/thread-context.h" |
| 22 | |
| 23 | #define TYPE_MEMORY_BACKEND "memory-backend" |
| 24 | OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass, |
| 25 | MEMORY_BACKEND) |
| 26 | |
| 27 | /* hostmem-ram.c */ |
| 28 | /** |
| 29 | * @TYPE_MEMORY_BACKEND_RAM: |
| 30 | * name of backend that uses mmap on the anonymous RAM |
| 31 | */ |
| 32 | |
| 33 | #define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram" |
| 34 | |
| 35 | /* hostmem-file.c */ |
| 36 | /** |
| 37 | * @TYPE_MEMORY_BACKEND_FILE: |
| 38 | * name of backend that uses mmap on a file descriptor |
| 39 | */ |
| 40 | #define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" |
| 41 | |
| 42 | #define TYPE_MEMORY_BACKEND_MEMFD "memory-backend-memfd" |
| 43 | |
| 44 | |
| 45 | /** |
| 46 | * HostMemoryBackendClass: |
| 47 | * @parent_class: opaque parent class container |
| 48 | */ |
| 49 | struct HostMemoryBackendClass { |
| 50 | ObjectClass parent_class; |
| 51 | |
| 52 | /** |
| 53 | * alloc: Allocate memory from backend. |
| 54 | * |
| 55 | * @backend: the #HostMemoryBackend. |
| 56 | * @errp: pointer to Error*, to store an error if it happens. |
| 57 | * |
| 58 | * Return: true on success, else false setting @errp with error. |
| 59 | */ |
| 60 | bool (*alloc)(HostMemoryBackend *backend, Error **errp); |
| 61 | }; |
| 62 | |
| 63 | /** |
| 64 | * @HostMemoryBackend |
| 65 | * |
| 66 | * @parent: opaque parent object container |
| 67 | * @size: amount of memory backend provides |
| 68 | * @mr: MemoryRegion representing host memory belonging to backend |
| 69 | * @prealloc_threads: number of threads to be used for preallocatining RAM |
| 70 | */ |
| 71 | struct HostMemoryBackend { |
| 72 | /* private */ |
| 73 | Object parent; |
| 74 | |
| 75 | /* protected */ |
| 76 | uint64_t size; |
| 77 | bool merge, dump, use_canonical_path; |
| 78 | bool prealloc, is_mapped, share, reserve; |
| 79 | bool guest_memfd, aligned; |
| 80 | uint32_t prealloc_threads; |
| 81 | ThreadContext *prealloc_context; |
| 82 | DECLARE_BITMAP(host_nodes, MAX_NODES + 1); |
| 83 | HostMemPolicy policy; |
| 84 | |
| 85 | MemoryRegion mr; |
| 86 | }; |
| 87 | |
| 88 | bool host_memory_backend_mr_inited(HostMemoryBackend *backend); |
| 89 | MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend); |
| 90 | |
| 91 | void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped); |
| 92 | bool host_memory_backend_is_mapped(HostMemoryBackend *backend); |
| 93 | size_t host_memory_backend_pagesize(HostMemoryBackend *memdev); |
| 94 | char *host_memory_backend_get_name(HostMemoryBackend *backend); |
| 95 | |
| 96 | long qemu_minrampagesize(void); |
| 97 | long qemu_maxrampagesize(void); |
| 98 | |
| 99 | #endif |