1 /* 2 * QEMU host SGX EPC memory backend 3 * 4 * Copyright (C) 2019 Intel Corporation 5 * 6 * Authors: 7 * Sean Christopherson <sean.j.christopherson@intel.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 <sys/ioctl.h> 15 #include "qom/object_interfaces.h" 16 #include "qapi/error.h" 17 #include "sysemu/hostmem.h" 18 #include "hw/i386/hostmem-epc.h" 19 20 static bool 21 sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) 22 { 23 g_autofree char *name = NULL; 24 uint32_t ram_flags; 25 int fd; 26 27 if (!backend->size) { 28 error_setg(errp, "can't create backend with size 0"); 29 return false; 30 } 31 32 fd = qemu_open("/dev/sgx_vepc", O_RDWR, errp); 33 if (fd < 0) { 34 return false; 35 } 36 37 backend->aligned = true; 38 name = object_get_canonical_path(OBJECT(backend)); 39 ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED; 40 return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), name, 41 backend->size, ram_flags, fd, 0, errp); 42 } 43 44 static void sgx_epc_backend_instance_init(Object *obj) 45 { 46 HostMemoryBackend *m = MEMORY_BACKEND(obj); 47 48 m->share = true; 49 m->merge = false; 50 m->dump = false; 51 } 52 53 static void sgx_epc_backend_class_init(ObjectClass *oc, void *data) 54 { 55 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); 56 57 bc->alloc = sgx_epc_backend_memory_alloc; 58 } 59 60 static const TypeInfo sgx_epc_backed_info = { 61 .name = TYPE_MEMORY_BACKEND_EPC, 62 .parent = TYPE_MEMORY_BACKEND, 63 .instance_init = sgx_epc_backend_instance_init, 64 .class_init = sgx_epc_backend_class_init, 65 .instance_size = sizeof(HostMemoryBackendEpc), 66 }; 67 68 static void register_types(void) 69 { 70 int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR); 71 if (fd >= 0) { 72 close(fd); 73 74 type_register_static(&sgx_epc_backed_info); 75 } 76 } 77 78 type_init(register_types); 79