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1 /*
2 * SGX EPC device
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 "qemu/osdep.h"
13 #include "hw/i386/pc.h"
14 #include "hw/i386/sgx-epc.h"
15 #include "hw/mem/memory-device.h"
16 #include "hw/core/qdev-properties.h"
17 #include "qapi/error.h"
18 #include "qapi/visitor.h"
19 #include "target/i386/cpu.h"
20 #include "system/address-spaces.h"
21
22 static const Property sgx_epc_properties[] = {
23 DEFINE_PROP_UINT64(SGX_EPC_ADDR_PROP, SGXEPCDevice, addr, 0),
24 DEFINE_PROP_UINT32(SGX_EPC_NUMA_NODE_PROP, SGXEPCDevice, node, 0),
25 DEFINE_PROP_LINK(SGX_EPC_MEMDEV_PROP, SGXEPCDevice, hostmem,
26 TYPE_MEMORY_BACKEND_EPC, HostMemoryBackendEpc *),
27 };
28
29 static void sgx_epc_get_size(Object *obj, Visitor *v, const char *name,
30 void *opaque, Error **errp)
31 {
32 Error *local_err = NULL;
33 uint64_t value;
34
35 value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err);
36 if (local_err) {
37 error_propagate(errp, local_err);
38 return;
39 }
40
41 visit_type_uint64(v, name, &value, errp);
42 }
43
44 static void sgx_epc_init(Object *obj)
45 {
46 object_property_add(obj, SGX_EPC_SIZE_PROP, "uint64", sgx_epc_get_size,
47 NULL, NULL, NULL);
48 }
49
50 static void sgx_epc_realize(DeviceState *dev, Error **errp)
51 {
52 PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
53 X86MachineState *x86ms = X86_MACHINE(pcms);
54 MemoryDeviceState *md = MEMORY_DEVICE(dev);
55 SGXEPCState *sgx_epc = &pcms->sgx_epc;
56 SGXEPCDevice *epc = SGX_EPC(dev);
57 HostMemoryBackend *hostmem;
58 const char *path;
59
60 if (x86ms->boot_cpus != 0) {
61 error_setg(errp, "'" TYPE_SGX_EPC "' can't be created after vCPUs,"
62 "e.g. via -device");
63 return;
64 }
65
66 if (!epc->hostmem) {
67 error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property is not set");
68 return;
69 }
70 hostmem = MEMORY_BACKEND(epc->hostmem);
71 if (host_memory_backend_is_mapped(hostmem)) {
72 path = object_get_canonical_path_component(OBJECT(hostmem));
73 error_setg(errp, "can't use already busy memdev: %s", path);
74 return;
75 }
76
77 epc->addr = sgx_epc->base + sgx_epc->size;
78
79 memory_region_add_subregion(&sgx_epc->mr, epc->addr - sgx_epc->base,
80 host_memory_backend_get_memory(hostmem));
81
82 host_memory_backend_set_mapped(hostmem, true);
83
84 sgx_epc->sections = g_renew(SGXEPCDevice *, sgx_epc->sections,
85 sgx_epc->nr_sections + 1);
86 sgx_epc->sections[sgx_epc->nr_sections++] = epc;
87
88 sgx_epc->size += memory_device_get_region_size(md, errp);
89 }
90
91 static void sgx_epc_unrealize(DeviceState *dev)
92 {
93 SGXEPCDevice *epc = SGX_EPC(dev);
94 HostMemoryBackend *hostmem = MEMORY_BACKEND(epc->hostmem);
95
96 host_memory_backend_set_mapped(hostmem, false);
97 }
98
99 static uint64_t sgx_epc_md_get_addr(const MemoryDeviceState *md)
100 {
101 const SGXEPCDevice *epc = SGX_EPC(md);
102
103 return epc->addr;
104 }
105
106 static void sgx_epc_md_set_addr(MemoryDeviceState *md, uint64_t addr,
107 Error **errp)
108 {
109 object_property_set_uint(OBJECT(md), SGX_EPC_ADDR_PROP, addr, errp);
110 }
111
112 static uint64_t sgx_epc_md_get_plugged_size(const MemoryDeviceState *md,
113 Error **errp)
114 {
115 return 0;
116 }
117
118 static MemoryRegion *sgx_epc_md_get_memory_region(MemoryDeviceState *md,
119 Error **errp)
120 {
121 SGXEPCDevice *epc = SGX_EPC(md);
122 HostMemoryBackend *hostmem;
123
124 if (!epc->hostmem) {
125 error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property must be set");
126 return NULL;
127 }
128
129 hostmem = MEMORY_BACKEND(epc->hostmem);
130 return host_memory_backend_get_memory(hostmem);
131 }
132
133 static void sgx_epc_md_fill_device_info(const MemoryDeviceState *md,
134 MemoryDeviceInfo *info)
135 {
136 SgxEPCDeviceInfo *se = g_new0(SgxEPCDeviceInfo, 1);
137 SGXEPCDevice *epc = SGX_EPC(md);
138
139 se->memaddr = epc->addr;
140 se->size = object_property_get_uint(OBJECT(epc), SGX_EPC_SIZE_PROP,
141 NULL);
142 se->node = object_property_get_uint(OBJECT(epc), SGX_EPC_NUMA_NODE_PROP,
143 NULL);
144 se->memdev = object_get_canonical_path(OBJECT(epc->hostmem));
145
146 info->u.sgx_epc.data = se;
147 info->type = MEMORY_DEVICE_INFO_KIND_SGX_EPC;
148 }
149
150 static void sgx_epc_class_init(ObjectClass *oc, const void *data)
151 {
152 DeviceClass *dc = DEVICE_CLASS(oc);
153 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
154
155 dc->hotpluggable = false;
156 dc->realize = sgx_epc_realize;
157 dc->unrealize = sgx_epc_unrealize;
158 dc->desc = "SGX EPC section";
159 dc->user_creatable = false;
160 device_class_set_props(dc, sgx_epc_properties);
161
162 mdc->get_addr = sgx_epc_md_get_addr;
163 mdc->set_addr = sgx_epc_md_set_addr;
164 mdc->get_plugged_size = sgx_epc_md_get_plugged_size;
165 mdc->get_memory_region = sgx_epc_md_get_memory_region;
166 mdc->fill_device_info = sgx_epc_md_fill_device_info;
167 }
168
169 static const TypeInfo sgx_epc_info = {
170 .name = TYPE_SGX_EPC,
171 .parent = TYPE_DEVICE,
172 .instance_size = sizeof(SGXEPCDevice),
173 .instance_init = sgx_epc_init,
174 .class_init = sgx_epc_class_init,
175 .class_size = sizeof(DeviceClass),
176 .interfaces = (const InterfaceInfo[]) {
177 { TYPE_MEMORY_DEVICE },
178 { }
179 },
180 };
181
182 static void sgx_epc_register_types(void)
183 {
184 type_register_static(&sgx_epc_info);
185 }
186
187 type_init(sgx_epc_register_types)