qemu-e2k/hw/i386/sgx-epc.c

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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 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);
vl: Add sgx compound properties to expose SGX EPC sections to guest Because SGX EPC is enumerated through CPUID, EPC "devices" need to be realized prior to realizing the vCPUs themselves, i.e. long before generic devices are parsed and realized. From a virtualization perspective, the CPUID aspect also means that EPC sections cannot be hotplugged without paravirtualizing the guest kernel (hardware does not support hotplugging as EPC sections must be locked down during pre-boot to provide EPC's security properties). So even though EPC sections could be realized through the generic -devices command, they need to be created much earlier for them to actually be usable by the guest. Place all EPC sections in a contiguous block, somewhat arbitrarily starting after RAM above 4g. Ensuring EPC is in a contiguous region simplifies calculations, e.g. device memory base, PCI hole, etc..., allows dynamic calculation of the total EPC size, e.g. exposing EPC to guests does not require -maxmem, and last but not least allows all of EPC to be enumerated in a single ACPI entry, which is expected by some kernels, e.g. Windows 7 and 8. The new compound properties command for sgx like below: ...... -object memory-backend-epc,id=mem1,size=28M,prealloc=on \ -object memory-backend-epc,id=mem2,size=10M \ -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2 Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Yang Zhong <yang.zhong@intel.com> Message-Id: <20210719112136.57018-6-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-09-28 10:40:58 +02:00
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;
}
vl: Add sgx compound properties to expose SGX EPC sections to guest Because SGX EPC is enumerated through CPUID, EPC "devices" need to be realized prior to realizing the vCPUs themselves, i.e. long before generic devices are parsed and realized. From a virtualization perspective, the CPUID aspect also means that EPC sections cannot be hotplugged without paravirtualizing the guest kernel (hardware does not support hotplugging as EPC sections must be locked down during pre-boot to provide EPC's security properties). So even though EPC sections could be realized through the generic -devices command, they need to be created much earlier for them to actually be usable by the guest. Place all EPC sections in a contiguous block, somewhat arbitrarily starting after RAM above 4g. Ensuring EPC is in a contiguous region simplifies calculations, e.g. device memory base, PCI hole, etc..., allows dynamic calculation of the total EPC size, e.g. exposing EPC to guests does not require -maxmem, and last but not least allows all of EPC to be enumerated in a single ACPI entry, which is expected by some kernels, e.g. Windows 7 and 8. The new compound properties command for sgx like below: ...... -object memory-backend-epc,id=mem1,size=28M,prealloc=on \ -object memory-backend-epc,id=mem2,size=10M \ -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2 Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Yang Zhong <yang.zhong@intel.com> Message-Id: <20210719112136.57018-6-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-09-28 10:40:58 +02:00
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 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)