xref: /openbmc/qemu/hw/i386/sgx-epc.c (revision 05caa062)
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_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     DEFINE_PROP_END_OF_LIST(),
28 };
29 
30 static void sgx_epc_get_size(Object *obj, Visitor *v, const char *name,
31                              void *opaque, Error **errp)
32 {
33     Error *local_err = NULL;
34     uint64_t value;
35 
36     value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err);
37     if (local_err) {
38         error_propagate(errp, local_err);
39         return;
40     }
41 
42     visit_type_uint64(v, name, &value, errp);
43 }
44 
45 static void sgx_epc_init(Object *obj)
46 {
47     object_property_add(obj, SGX_EPC_SIZE_PROP, "uint64", sgx_epc_get_size,
48                         NULL, NULL, NULL);
49 }
50 
51 static void sgx_epc_realize(DeviceState *dev, Error **errp)
52 {
53     PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
54     X86MachineState *x86ms = X86_MACHINE(pcms);
55     MemoryDeviceState *md = MEMORY_DEVICE(dev);
56     SGXEPCState *sgx_epc = &pcms->sgx_epc;
57     SGXEPCDevice *epc = SGX_EPC(dev);
58     HostMemoryBackend *hostmem;
59     const char *path;
60 
61     if (x86ms->boot_cpus != 0) {
62         error_setg(errp, "'" TYPE_SGX_EPC "' can't be created after vCPUs,"
63                          "e.g. via -device");
64         return;
65     }
66 
67     if (!epc->hostmem) {
68         error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property is not set");
69         return;
70     }
71     hostmem = MEMORY_BACKEND(epc->hostmem);
72     if (host_memory_backend_is_mapped(hostmem)) {
73         path = object_get_canonical_path_component(OBJECT(hostmem));
74         error_setg(errp, "can't use already busy memdev: %s", path);
75         return;
76     }
77 
78     epc->addr = sgx_epc->base + sgx_epc->size;
79 
80     memory_region_add_subregion(&sgx_epc->mr, epc->addr - sgx_epc->base,
81                                 host_memory_backend_get_memory(hostmem));
82 
83     host_memory_backend_set_mapped(hostmem, true);
84 
85     sgx_epc->sections = g_renew(SGXEPCDevice *, sgx_epc->sections,
86                                 sgx_epc->nr_sections + 1);
87     sgx_epc->sections[sgx_epc->nr_sections++] = epc;
88 
89     sgx_epc->size += memory_device_get_region_size(md, errp);
90 }
91 
92 static void sgx_epc_unrealize(DeviceState *dev)
93 {
94     SGXEPCDevice *epc = SGX_EPC(dev);
95     HostMemoryBackend *hostmem = MEMORY_BACKEND(epc->hostmem);
96 
97     host_memory_backend_set_mapped(hostmem, false);
98 }
99 
100 static uint64_t sgx_epc_md_get_addr(const MemoryDeviceState *md)
101 {
102     const SGXEPCDevice *epc = SGX_EPC(md);
103 
104     return epc->addr;
105 }
106 
107 static void sgx_epc_md_set_addr(MemoryDeviceState *md, uint64_t addr,
108                                 Error **errp)
109 {
110     object_property_set_uint(OBJECT(md), SGX_EPC_ADDR_PROP, addr, errp);
111 }
112 
113 static uint64_t sgx_epc_md_get_plugged_size(const MemoryDeviceState *md,
114                                             Error **errp)
115 {
116     return 0;
117 }
118 
119 static MemoryRegion *sgx_epc_md_get_memory_region(MemoryDeviceState *md,
120                                                   Error **errp)
121 {
122     SGXEPCDevice *epc = SGX_EPC(md);
123     HostMemoryBackend *hostmem;
124 
125     if (!epc->hostmem) {
126         error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property must be set");
127         return NULL;
128     }
129 
130     hostmem = MEMORY_BACKEND(epc->hostmem);
131     return host_memory_backend_get_memory(hostmem);
132 }
133 
134 static void sgx_epc_md_fill_device_info(const MemoryDeviceState *md,
135                                         MemoryDeviceInfo *info)
136 {
137     SgxEPCDeviceInfo *se = g_new0(SgxEPCDeviceInfo, 1);
138     SGXEPCDevice *epc = SGX_EPC(md);
139 
140     se->memaddr = epc->addr;
141     se->size = object_property_get_uint(OBJECT(epc), SGX_EPC_SIZE_PROP,
142                                         NULL);
143     se->node = object_property_get_uint(OBJECT(epc), SGX_EPC_NUMA_NODE_PROP,
144                                         NULL);
145     se->memdev = object_get_canonical_path(OBJECT(epc->hostmem));
146 
147     info->u.sgx_epc.data = se;
148     info->type = MEMORY_DEVICE_INFO_KIND_SGX_EPC;
149 }
150 
151 static void sgx_epc_class_init(ObjectClass *oc, void *data)
152 {
153     DeviceClass *dc = DEVICE_CLASS(oc);
154     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
155 
156     dc->hotpluggable = false;
157     dc->realize = sgx_epc_realize;
158     dc->unrealize = sgx_epc_unrealize;
159     dc->desc = "SGX EPC section";
160     dc->user_creatable = false;
161     device_class_set_props(dc, sgx_epc_properties);
162 
163     mdc->get_addr = sgx_epc_md_get_addr;
164     mdc->set_addr = sgx_epc_md_set_addr;
165     mdc->get_plugged_size = sgx_epc_md_get_plugged_size;
166     mdc->get_memory_region = sgx_epc_md_get_memory_region;
167     mdc->fill_device_info = sgx_epc_md_fill_device_info;
168 }
169 
170 static const TypeInfo sgx_epc_info = {
171     .name          = TYPE_SGX_EPC,
172     .parent        = TYPE_DEVICE,
173     .instance_size = sizeof(SGXEPCDevice),
174     .instance_init = sgx_epc_init,
175     .class_init    = sgx_epc_class_init,
176     .class_size    = sizeof(DeviceClass),
177     .interfaces = (InterfaceInfo[]) {
178         { TYPE_MEMORY_DEVICE },
179         { }
180     },
181 };
182 
183 static void sgx_epc_register_types(void)
184 {
185     type_register_static(&sgx_epc_info);
186 }
187 
188 type_init(sgx_epc_register_types)
189