This adds sysbus bindings for the variable service.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/uefi/var-service-sysbus.c | 87 ++++++++++++++++++++++++++++++++++++
 hw/uefi/meson.build          |  3 +-
 2 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100644 hw/uefi/var-service-sysbus.c

diff --git a/hw/uefi/var-service-sysbus.c b/hw/uefi/var-service-sysbus.c
new file mode 100644
index 000000000000..2b393fc768a9
--- /dev/null
+++ b/hw/uefi/var-service-sysbus.c
@@ -0,0 +1,87 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * uefi vars device - sysbus variant.
+ */
+#include "qemu/osdep.h"
+#include "migration/vmstate.h"
+
+#include "hw/qdev-properties.h"
+#include "hw/sysbus.h"
+
+#include "hw/uefi/var-service.h"
+#include "hw/uefi/var-service-api.h"
+
+#define TYPE_UEFI_VARS_SYSBUS "uefi-vars-sysbus"
+OBJECT_DECLARE_SIMPLE_TYPE(uefi_vars_sysbus_state, UEFI_VARS_SYSBUS)
+
+struct uefi_vars_sysbus_state {
+    SysBusDevice parent_obj;
+    struct uefi_vars_state state;
+};
+
+static const VMStateDescription vmstate_uefi_vars_sysbus = {
+    .name = "uefi-vars-sysbus",
+    .fields = (VMStateField[]) {
+        VMSTATE_STRUCT(state, uefi_vars_sysbus_state, 0,
+                       vmstate_uefi_vars, uefi_vars_state),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property uefi_vars_sysbus_properties[] = {
+    DEFINE_PROP_SIZE("size", uefi_vars_sysbus_state, state.max_storage,
+                     256 * 1024),
+    DEFINE_PROP_STRING("jsonfile", uefi_vars_sysbus_state, state.jsonfile),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void uefi_vars_sysbus_init(Object *obj)
+{
+    uefi_vars_sysbus_state *uv = UEFI_VARS_SYSBUS(obj);
+
+    uefi_vars_init(obj, &uv->state);
+}
+
+static void uefi_vars_sysbus_reset(DeviceState *dev)
+{
+    uefi_vars_sysbus_state *uv = UEFI_VARS_SYSBUS(dev);
+
+    uefi_vars_hard_reset(&uv->state);
+}
+
+static void uefi_vars_sysbus_realize(DeviceState *dev, Error **errp)
+{
+    uefi_vars_sysbus_state *uv = UEFI_VARS_SYSBUS(dev);
+    SysBusDevice *sysbus = SYS_BUS_DEVICE(dev);
+
+    sysbus_init_mmio(sysbus, &uv->state.mr);
+    uefi_vars_realize(&uv->state, errp);
+}
+
+static void uefi_vars_sysbus_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = uefi_vars_sysbus_realize;
+    dc->reset = uefi_vars_sysbus_reset;
+    dc->vmsd = &vmstate_uefi_vars_sysbus;
+    device_class_set_props(dc, uefi_vars_sysbus_properties);
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo uefi_vars_sysbus_info = {
+    .name          = TYPE_UEFI_VARS_SYSBUS,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(uefi_vars_sysbus_state),
+    .instance_init = uefi_vars_sysbus_init,
+    .class_init    = uefi_vars_sysbus_class_init,
+};
+module_obj(TYPE_UEFI_VARS_SYSBUS);
+
+static void uefi_vars_sysbus_register_types(void)
+{
+    type_register_static(&uefi_vars_sysbus_info);
+}
+
+type_init(uefi_vars_sysbus_register_types)
diff --git a/hw/uefi/meson.build b/hw/uefi/meson.build
index b620297320d0..dc363d67cccc 100644
--- a/hw/uefi/meson.build
+++ b/hw/uefi/meson.build
@@ -5,7 +5,8 @@ uefi_vars_ss.add(when: 'CONFIG_UEFI_VARS',
                                 'var-service-vars.c',
                                 'var-service-auth.c',
                                 'var-service-guid.c',
-                                'var-service-policy.c'))
+                                'var-service-policy.c',
+                                'var-service-sysbus.c'))
 
 modules += { 'hw-uefi' : {
     'vars'     : uefi_vars_ss,
-- 
2.41.0