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 #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 43 /** 44 * HostMemoryBackendClass: 45 * @parent_class: opaque parent class container 46 */ 47 struct HostMemoryBackendClass { 48 ObjectClass parent_class; 49 50 void (*alloc)(HostMemoryBackend *backend, Error **errp); 51 }; 52 53 /** 54 * @HostMemoryBackend 55 * 56 * @parent: opaque parent object container 57 * @size: amount of memory backend provides 58 * @mr: MemoryRegion representing host memory belonging to backend 59 * @prealloc_threads: number of threads to be used for preallocatining RAM 60 */ 61 struct HostMemoryBackend { 62 /* private */ 63 Object parent; 64 65 /* protected */ 66 uint64_t size; 67 bool merge, dump, use_canonical_path; 68 bool prealloc, is_mapped, share, reserve; 69 uint32_t prealloc_threads; 70 ThreadContext *prealloc_context; 71 DECLARE_BITMAP(host_nodes, MAX_NODES + 1); 72 HostMemPolicy policy; 73 74 MemoryRegion mr; 75 }; 76 77 bool host_memory_backend_mr_inited(HostMemoryBackend *backend); 78 MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend); 79 80 void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped); 81 bool host_memory_backend_is_mapped(HostMemoryBackend *backend); 82 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev); 83 char *host_memory_backend_get_name(HostMemoryBackend *backend); 84 85 #endif 86