| 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 | #include "qemu/osdep.h" |
| 14 | #include "system/hostmem.h" |
| 15 | #include "qapi/error.h" |
| 16 | #include "qemu/module.h" |
| 17 | #include "qom/object_interfaces.h" |
| 18 | |
| 19 | static bool |
| 20 | ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) |
| 21 | { |
| 22 | g_autofree char *name = NULL; |
| 23 | uint32_t ram_flags; |
| 24 | |
| 25 | if (!backend->size) { |
| 26 | error_setg(errp, "can't create backend with size 0"); |
| 27 | return false; |
| 28 | } |
| 29 | |
| 30 | name = host_memory_backend_get_name(backend); |
| 31 | ram_flags = backend->share ? RAM_SHARED : RAM_PRIVATE; |
| 32 | ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; |
| 33 | ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0; |
| 34 | return memory_region_init_ram_flags_nomigrate(&backend->mr, OBJECT(backend), |
| 35 | name, backend->size, |
| 36 | ram_flags, errp); |
| 37 | } |
| 38 | |
| 39 | static void |
| 40 | ram_backend_class_init(ObjectClass *oc, const void *data) |
| 41 | { |
| 42 | HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
| 43 | |
| 44 | bc->alloc = ram_backend_memory_alloc; |
| 45 | } |
| 46 | |
| 47 | static const TypeInfo ram_backend_info = { |
| 48 | .name = TYPE_MEMORY_BACKEND_RAM, |
| 49 | .parent = TYPE_MEMORY_BACKEND, |
| 50 | .class_init = ram_backend_class_init, |
| 51 | }; |
| 52 | |
| 53 | static void register_types(void) |
| 54 | { |
| 55 | type_register_static(&ram_backend_info); |
| 56 | } |
| 57 | |
| 58 | type_init(register_types); |