qemu

sgx-epc.c (5730B)

---

 /*
  * SGX EPC device
  *
  * Copyright (C) 2019 Intel Corporation
  *
  * Authors:
  *   Sean Christopherson <sean.j.christopherson@intel.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 #include "qemu/osdep.h"
 #include "hw/i386/pc.h"
 #include "hw/i386/sgx-epc.h"
 #include "hw/mem/memory-device.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qapi/visitor.h"
 #include "target/i386/cpu.h"
 #include "exec/address-spaces.h"
 
 static Property sgx_epc_properties[] = {
     DEFINE_PROP_UINT64(SGX_EPC_ADDR_PROP, SGXEPCDevice, addr, 0),
     DEFINE_PROP_UINT32(SGX_EPC_NUMA_NODE_PROP, SGXEPCDevice, node, 0),
     DEFINE_PROP_LINK(SGX_EPC_MEMDEV_PROP, SGXEPCDevice, hostmem,
                      TYPE_MEMORY_BACKEND_EPC, HostMemoryBackendEpc *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static void sgx_epc_get_size(Object *obj, Visitor *v, const char *name,
                              void *opaque, Error **errp)
 {
     Error *local_err = NULL;
     uint64_t value;
 
     value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
 
     visit_type_uint64(v, name, &value, errp);
 }
 
 static void sgx_epc_init(Object *obj)
 {
     object_property_add(obj, SGX_EPC_SIZE_PROP, "uint64", sgx_epc_get_size,
                         NULL, NULL, NULL);
 }
 
 static void sgx_epc_realize(DeviceState *dev, Error **errp)
 {
     PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
     X86MachineState *x86ms = X86_MACHINE(pcms);
     MemoryDeviceState *md = MEMORY_DEVICE(dev);
     SGXEPCState *sgx_epc = &pcms->sgx_epc;
     SGXEPCDevice *epc = SGX_EPC(dev);
     HostMemoryBackend *hostmem;
     const char *path;
 
     if (x86ms->boot_cpus != 0) {
         error_setg(errp, "'" TYPE_SGX_EPC "' can't be created after vCPUs,"
                          "e.g. via -device");
         return;
     }
 
     if (!epc->hostmem) {
         error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property is not set");
         return;
     }
     hostmem = MEMORY_BACKEND(epc->hostmem);
     if (host_memory_backend_is_mapped(hostmem)) {
         path = object_get_canonical_path_component(OBJECT(hostmem));
         error_setg(errp, "can't use already busy memdev: %s", path);
         return;
     }
 
     epc->addr = sgx_epc->base + sgx_epc->size;
 
     memory_region_add_subregion(&sgx_epc->mr, epc->addr - sgx_epc->base,
                                 host_memory_backend_get_memory(hostmem));
 
     host_memory_backend_set_mapped(hostmem, true);
 
     sgx_epc->sections = g_renew(SGXEPCDevice *, sgx_epc->sections,
                                 sgx_epc->nr_sections + 1);
     sgx_epc->sections[sgx_epc->nr_sections++] = epc;
 
     sgx_epc->size += memory_device_get_region_size(md, errp);
 }
 
 static void sgx_epc_unrealize(DeviceState *dev)
 {
     SGXEPCDevice *epc = SGX_EPC(dev);
     HostMemoryBackend *hostmem = MEMORY_BACKEND(epc->hostmem);
 
     host_memory_backend_set_mapped(hostmem, false);
 }
 
 static uint64_t sgx_epc_md_get_addr(const MemoryDeviceState *md)
 {
     const SGXEPCDevice *epc = SGX_EPC(md);
 
     return epc->addr;
 }
 
 static void sgx_epc_md_set_addr(MemoryDeviceState *md, uint64_t addr,
                                 Error **errp)
 {
     object_property_set_uint(OBJECT(md), SGX_EPC_ADDR_PROP, addr, errp);
 }
 
 static uint64_t sgx_epc_md_get_plugged_size(const MemoryDeviceState *md,
                                             Error **errp)
 {
     return 0;
 }
 
 static MemoryRegion *sgx_epc_md_get_memory_region(MemoryDeviceState *md,
                                                   Error **errp)
 {
     SGXEPCDevice *epc = SGX_EPC(md);
     HostMemoryBackend *hostmem;
 
     if (!epc->hostmem) {
         error_setg(errp, "'" SGX_EPC_MEMDEV_PROP "' property must be set");
         return NULL;
     }
 
     hostmem = MEMORY_BACKEND(epc->hostmem);
     return host_memory_backend_get_memory(hostmem);
 }
 
 static void sgx_epc_md_fill_device_info(const MemoryDeviceState *md,
                                         MemoryDeviceInfo *info)
 {
     SgxEPCDeviceInfo *se = g_new0(SgxEPCDeviceInfo, 1);
     SGXEPCDevice *epc = SGX_EPC(md);
 
     se->memaddr = epc->addr;
     se->size = object_property_get_uint(OBJECT(epc), SGX_EPC_SIZE_PROP,
                                         NULL);
     se->node = object_property_get_uint(OBJECT(epc), SGX_EPC_NUMA_NODE_PROP,
                                         NULL);
     se->memdev = object_get_canonical_path(OBJECT(epc->hostmem));
 
     info->u.sgx_epc.data = se;
     info->type = MEMORY_DEVICE_INFO_KIND_SGX_EPC;
 }
 
 static void sgx_epc_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
 
     dc->hotpluggable = false;
     dc->realize = sgx_epc_realize;
     dc->unrealize = sgx_epc_unrealize;
     dc->desc = "SGX EPC section";
     dc->user_creatable = false;
     device_class_set_props(dc, sgx_epc_properties);
 
     mdc->get_addr = sgx_epc_md_get_addr;
     mdc->set_addr = sgx_epc_md_set_addr;
     mdc->get_plugged_size = sgx_epc_md_get_plugged_size;
     mdc->get_memory_region = sgx_epc_md_get_memory_region;
     mdc->fill_device_info = sgx_epc_md_fill_device_info;
 }
 
 static const TypeInfo sgx_epc_info = {
     .name          = TYPE_SGX_EPC,
     .parent        = TYPE_DEVICE,
     .instance_size = sizeof(SGXEPCDevice),
     .instance_init = sgx_epc_init,
     .class_init    = sgx_epc_class_init,
     .class_size    = sizeof(DeviceClass),
     .interfaces = (InterfaceInfo[]) {
         { TYPE_MEMORY_DEVICE },
         { }
     },
 };
 
 static void sgx_epc_register_types(void)
 {
     type_register_static(&sgx_epc_info);
 }
 
 type_init(sgx_epc_register_types)