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 /** 51 * alloc: Allocate memory from backend. 52 * 53 * @backend: the #HostMemoryBackend. 54 * @errp: pointer to Error*, to store an error if it happens. 55 * 56 * Return: true on success, else false setting @errp with error. 57 */ 58 bool (*alloc)(HostMemoryBackend *backend, Error **errp); 59 }; 60 61 /** 62 * @HostMemoryBackend 63 * 64 * @parent: opaque parent object container 65 * @size: amount of memory backend provides 66 * @mr: MemoryRegion representing host memory belonging to backend 67 * @prealloc_threads: number of threads to be used for preallocatining RAM 68 */ 69 struct HostMemoryBackend { 70 /* private */ 71 Object parent; 72 73 /* protected */ 74 uint64_t size; 75 bool merge, dump, use_canonical_path; 76 bool prealloc, is_mapped, share, reserve; 77 uint32_t prealloc_threads; 78 ThreadContext *prealloc_context; 79 DECLARE_BITMAP(host_nodes, MAX_NODES + 1); 80 HostMemPolicy policy; 81 82 MemoryRegion mr; 83 }; 84 85 bool host_memory_backend_mr_inited(HostMemoryBackend *backend); 86 MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend); 87 88 void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped); 89 bool host_memory_backend_is_mapped(HostMemoryBackend *backend); 90 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev); 91 char *host_memory_backend_get_name(HostMemoryBackend *backend); 92 93 #endif 94