| /* |
| * QEMU host SGX EPC memory backend |
| * |
| * Copyright (C) 2019 Intel Corporation |
| * |
| * Authors: |
| * Sean Christopherson <sean.j.christopherson@intel.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include <sys/ioctl.h> |
| #include "qom/object_interfaces.h" |
| #include "qapi/error.h" |
| #include "sysemu/hostmem.h" |
| #include "hw/i386/hostmem-epc.h" |
| |
| static bool |
| sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) |
| { |
| g_autofree char *name = NULL; |
| uint32_t ram_flags; |
| int fd; |
| |
| if (!backend->size) { |
| error_setg(errp, "can't create backend with size 0"); |
| return false; |
| } |
| |
| fd = qemu_open("/dev/sgx_vepc", O_RDWR, errp); |
| if (fd < 0) { |
| return false; |
| } |
| |
| backend->aligned = true; |
| name = object_get_canonical_path(OBJECT(backend)); |
| ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED; |
| return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), name, |
| backend->size, ram_flags, fd, 0, errp); |
| } |
| |
| static void sgx_epc_backend_instance_init(Object *obj) |
| { |
| HostMemoryBackend *m = MEMORY_BACKEND(obj); |
| |
| m->share = true; |
| m->merge = false; |
| m->dump = false; |
| } |
| |
| static void sgx_epc_backend_class_init(ObjectClass *oc, void *data) |
| { |
| HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); |
| |
| bc->alloc = sgx_epc_backend_memory_alloc; |
| } |
| |
| static const TypeInfo sgx_epc_backed_info = { |
| .name = TYPE_MEMORY_BACKEND_EPC, |
| .parent = TYPE_MEMORY_BACKEND, |
| .instance_init = sgx_epc_backend_instance_init, |
| .class_init = sgx_epc_backend_class_init, |
| .instance_size = sizeof(HostMemoryBackendEpc), |
| }; |
| |
| static void register_types(void) |
| { |
| int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR); |
| if (fd >= 0) { |
| close(fd); |
| |
| type_register_static(&sgx_epc_backed_info); |
| } |
| } |
| |
| type_init(register_types); |