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-rw-r--r--backends/hostmem-epc.c82
-rw-r--r--backends/meson.build1
2 files changed, 83 insertions, 0 deletions
diff --git a/backends/hostmem-epc.c b/backends/hostmem-epc.c
new file mode 100644
index 0000000000..b47f98b6a3
--- /dev/null
+++ b/backends/hostmem-epc.c
@@ -0,0 +1,82 @@
+/*
+ * QEMU host SGX EPC memory backend
+ *
+ * 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 <sys/ioctl.h>
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qom/object_interfaces.h"
+#include "qapi/error.h"
+#include "sysemu/hostmem.h"
+#include "hw/i386/hostmem-epc.h"
+
+static void
+sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
+{
+ uint32_t ram_flags;
+ char *name;
+ int fd;
+
+ if (!backend->size) {
+ error_setg(errp, "can't create backend with size 0");
+ return;
+ }
+
+ fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
+ if (fd < 0) {
+ error_setg_errno(errp, errno,
+ "failed to open /dev/sgx_vepc to alloc SGX EPC");
+ return;
+ }
+
+ name = object_get_canonical_path(OBJECT(backend));
+ ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED;
+ memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
+ name, backend->size, ram_flags,
+ fd, 0, errp);
+ g_free(name);
+}
+
+static void sgx_epc_backend_instance_init(Object *obj)
+{
+ HostMemoryBackend *m = MEMORY_BACKEND(obj);
+
+ m->share = true;
+ m->merge = false;
+ m->dump = false;
+}
+
+static void sgx_epc_backend_class_init(ObjectClass *oc, void *data)
+{
+ HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
+
+ bc->alloc = sgx_epc_backend_memory_alloc;
+}
+
+static const TypeInfo sgx_epc_backed_info = {
+ .name = TYPE_MEMORY_BACKEND_EPC,
+ .parent = TYPE_MEMORY_BACKEND,
+ .instance_init = sgx_epc_backend_instance_init,
+ .class_init = sgx_epc_backend_class_init,
+ .instance_size = sizeof(HostMemoryBackendEpc),
+};
+
+static void register_types(void)
+{
+ int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
+ if (fd >= 0) {
+ close(fd);
+
+ type_register_static(&sgx_epc_backed_info);
+ }
+}
+
+type_init(register_types);
diff --git a/backends/meson.build b/backends/meson.build
index d4221831fc..6e68945528 100644
--- a/backends/meson.build
+++ b/backends/meson.build
@@ -16,5 +16,6 @@ softmmu_ss.add(when: ['CONFIG_VHOST_USER', 'CONFIG_VIRTIO'], if_true: files('vho
softmmu_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true: files('cryptodev-vhost.c'))
softmmu_ss.add(when: ['CONFIG_VIRTIO_CRYPTO', 'CONFIG_VHOST_CRYPTO'], if_true: files('cryptodev-vhost-user.c'))
softmmu_ss.add(when: 'CONFIG_GIO', if_true: [files('dbus-vmstate.c'), gio])
+softmmu_ss.add(when: 'CONFIG_SGX', if_true: files('hostmem-epc.c'))
subdir('tpm')