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_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)