82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
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/*
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* QEMU host SGX EPC memory backend
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*
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* Copyright (C) 2019 Intel Corporation
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*
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* Authors:
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* Sean Christopherson <sean.j.christopherson@intel.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include <sys/ioctl.h>
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#include "qemu/osdep.h"
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#include "qom/object_interfaces.h"
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#include "qapi/error.h"
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#include "sysemu/hostmem.h"
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#include "hw/i386/hostmem-epc.h"
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static void
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sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
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{
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uint32_t ram_flags;
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char *name;
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int fd;
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if (!backend->size) {
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error_setg(errp, "can't create backend with size 0");
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return;
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}
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fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
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if (fd < 0) {
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error_setg_errno(errp, errno,
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"failed to open /dev/sgx_vepc to alloc SGX EPC");
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return;
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}
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name = object_get_canonical_path(OBJECT(backend));
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ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED;
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memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
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name, backend->size, ram_flags,
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fd, 0, errp);
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g_free(name);
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}
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static void sgx_epc_backend_instance_init(Object *obj)
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{
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HostMemoryBackend *m = MEMORY_BACKEND(obj);
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m->share = true;
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m->merge = false;
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m->dump = false;
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}
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static void sgx_epc_backend_class_init(ObjectClass *oc, void *data)
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{
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HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
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bc->alloc = sgx_epc_backend_memory_alloc;
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}
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static const TypeInfo sgx_epc_backed_info = {
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.name = TYPE_MEMORY_BACKEND_EPC,
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.parent = TYPE_MEMORY_BACKEND,
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.instance_init = sgx_epc_backend_instance_init,
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.class_init = sgx_epc_backend_class_init,
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.instance_size = sizeof(HostMemoryBackendEpc),
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};
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static void register_types(void)
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{
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int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
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if (fd >= 0) {
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close(fd);
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type_register_static(&sgx_epc_backed_info);
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}
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}
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type_init(register_types);
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