xref: /openbmc/qemu/hw/i386/sgx-epc.c (revision efee71c8)
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/qdev-properties.h"
17 #include "qapi/error.h"
18 #include "qapi/visitor.h"
19 #include "target/i386/cpu.h"
20 #include "exec/address-spaces.h"
21 
22 static Property sgx_epc_properties[] = {
23     DEFINE_PROP_UINT64(SGX_EPC_ADDR_PROP, SGXEPCDevice, addr, 0),
24     DEFINE_PROP_LINK(SGX_EPC_MEMDEV_PROP, SGXEPCDevice, hostmem,
25                      TYPE_MEMORY_BACKEND_EPC, HostMemoryBackendEpc *),
26     DEFINE_PROP_END_OF_LIST(),
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->memdev = object_get_canonical_path(OBJECT(epc->hostmem));
143 
144     info->u.sgx_epc.data = se;
145     info->type = MEMORY_DEVICE_INFO_KIND_SGX_EPC;
146 }
147 
148 static void sgx_epc_class_init(ObjectClass *oc, void *data)
149 {
150     DeviceClass *dc = DEVICE_CLASS(oc);
151     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
152 
153     dc->hotpluggable = false;
154     dc->realize = sgx_epc_realize;
155     dc->unrealize = sgx_epc_unrealize;
156     dc->desc = "SGX EPC section";
157     device_class_set_props(dc, sgx_epc_properties);
158 
159     mdc->get_addr = sgx_epc_md_get_addr;
160     mdc->set_addr = sgx_epc_md_set_addr;
161     mdc->get_plugged_size = sgx_epc_md_get_plugged_size;
162     mdc->get_memory_region = sgx_epc_md_get_memory_region;
163     mdc->fill_device_info = sgx_epc_md_fill_device_info;
164 }
165 
166 static TypeInfo sgx_epc_info = {
167     .name          = TYPE_SGX_EPC,
168     .parent        = TYPE_DEVICE,
169     .instance_size = sizeof(SGXEPCDevice),
170     .instance_init = sgx_epc_init,
171     .class_init    = sgx_epc_class_init,
172     .class_size    = sizeof(DeviceClass),
173     .interfaces = (InterfaceInfo[]) {
174         { TYPE_MEMORY_DEVICE },
175         { }
176     },
177 };
178 
179 static void sgx_epc_register_types(void)
180 {
181     type_register_static(&sgx_epc_info);
182 }
183 
184 type_init(sgx_epc_register_types)
185