hw/i386/sgx-epc.c

   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     dc->user_creatable = false;
 158     device_class_set_props(dc, sgx_epc_properties);
 159
 160     mdc->get_addr = sgx_epc_md_get_addr;
 161     mdc->set_addr = sgx_epc_md_set_addr;
 162     mdc->get_plugged_size = sgx_epc_md_get_plugged_size;
 163     mdc->get_memory_region = sgx_epc_md_get_memory_region;
 164     mdc->fill_device_info = sgx_epc_md_fill_device_info;
 165 }
 166
 167 static TypeInfo sgx_epc_info = {
 168     .name          = TYPE_SGX_EPC,
 169     .parent        = TYPE_DEVICE,
 170     .instance_size = sizeof(SGXEPCDevice),
 171     .instance_init = sgx_epc_init,
 172     .class_init    = sgx_epc_class_init,
 173     .class_size    = sizeof(DeviceClass),
 174     .interfaces = (InterfaceInfo[]) {
 175         { TYPE_MEMORY_DEVICE },
 176         { }
 177     },
 178 };
 179
 180 static void sgx_epc_register_types(void)
 181 {
 182     type_register_static(&sgx_epc_info);
 183 }
 184
 185 type_init(sgx_epc_register_types)