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