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 SYSEMU_HOSTMEM_H 14 #define SYSEMU_HOSTMEM_H 15 16 #include "sysemu/numa.h" 17 #include "qapi/qapi-types-machine.h" 18 #include "qom/object.h" 19 #include "exec/memory.h" 20 #include "qemu/bitmap.h" 21 22 #define TYPE_MEMORY_BACKEND "memory-backend" 23 OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass, 24 MEMORY_BACKEND) 25 26 /* hostmem-ram.c */ 27 /** 28 * @TYPE_MEMORY_BACKEND_RAM: 29 * name of backend that uses mmap on the anonymous RAM 30 */ 31 32 #define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram" 33 34 /* hostmem-file.c */ 35 /** 36 * @TYPE_MEMORY_BACKEND_FILE: 37 * name of backend that uses mmap on a file descriptor 38 */ 39 #define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" 40 41 42 /** 43 * HostMemoryBackendClass: 44 * @parent_class: opaque parent class container 45 */ 46 struct HostMemoryBackendClass { 47 ObjectClass parent_class; 48 49 void (*alloc)(HostMemoryBackend *backend, Error **errp); 50 }; 51 52 /** 53 * @HostMemoryBackend 54 * 55 * @parent: opaque parent object container 56 * @size: amount of memory backend provides 57 * @mr: MemoryRegion representing host memory belonging to backend 58 * @prealloc_threads: number of threads to be used for preallocatining RAM 59 */ 60 struct HostMemoryBackend { 61 /* private */ 62 Object parent; 63 64 /* protected */ 65 uint64_t size; 66 bool merge, dump, use_canonical_path; 67 bool prealloc, is_mapped, share, reserve; 68 uint32_t prealloc_threads; 69 DECLARE_BITMAP(host_nodes, MAX_NODES + 1); 70 HostMemPolicy policy; 71 72 MemoryRegion mr; 73 }; 74 75 bool host_memory_backend_mr_inited(HostMemoryBackend *backend); 76 MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend); 77 78 void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped); 79 bool host_memory_backend_is_mapped(HostMemoryBackend *backend); 80 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev); 81 char *host_memory_backend_get_name(HostMemoryBackend *backend); 82 83 #endif 84