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/*
* 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 const 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 *),
};
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)
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