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 #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 #endif 97