Merge tag 'pull-la-20220808' of https://gitlab.com/rth7680/qemu into staging
[qemu.git] / backends / hostmem-epc.c
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 #include <sys/ioctl.h>
13
14 #include "qemu/osdep.h"
15 #include "qemu-common.h"
16 #include "qom/object_interfaces.h"
17 #include "qapi/error.h"
18 #include "sysemu/hostmem.h"
19 #include "hw/i386/hostmem-epc.h"
20
21 static void
22 sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
23 {
24 uint32_t ram_flags;
25 char *name;
26 int fd;
27
28 if (!backend->size) {
29 error_setg(errp, "can't create backend with size 0");
30 return;
31 }
32
33 fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
34 if (fd < 0) {
35 error_setg_errno(errp, errno,
36 "failed to open /dev/sgx_vepc to alloc SGX EPC");
37 return;
38 }
39
40 name = object_get_canonical_path(OBJECT(backend));
41 ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED;
42 memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
43 name, backend->size, ram_flags,
44 fd, 0, errp);
45 g_free(name);
46 }
47
48 static void sgx_epc_backend_instance_init(Object *obj)
49 {
50 HostMemoryBackend *m = MEMORY_BACKEND(obj);
51
52 m->share = true;
53 m->merge = false;
54 m->dump = false;
55 }
56
57 static void sgx_epc_backend_class_init(ObjectClass *oc, void *data)
58 {
59 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
60
61 bc->alloc = sgx_epc_backend_memory_alloc;
62 }
63
64 static const TypeInfo sgx_epc_backed_info = {
65 .name = TYPE_MEMORY_BACKEND_EPC,
66 .parent = TYPE_MEMORY_BACKEND,
67 .instance_init = sgx_epc_backend_instance_init,
68 .class_init = sgx_epc_backend_class_init,
69 .instance_size = sizeof(HostMemoryBackendEpc),
70 };
71
72 static void register_types(void)
73 {
74 int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
75 if (fd >= 0) {
76 close(fd);
77
78 type_register_static(&sgx_epc_backed_info);
79 }
80 }
81
82 type_init(register_types);