This adds isa bindings for the variable service.

Usage: qemu-system-x86_64 -device uefi-vars-isa,jsonfile=/path/to/uefivars.json

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/uefi/var-service-isa.c | 88 +++++++++++++++++++++++++++++++++++++++
 hw/uefi/Kconfig           |  6 +++
 hw/uefi/meson.build       |  5 +++
 3 files changed, 99 insertions(+)
 create mode 100644 hw/uefi/var-service-isa.c

diff --git a/hw/uefi/var-service-isa.c b/hw/uefi/var-service-isa.c
new file mode 100644
index 000000000000..bdb270c2a643
--- /dev/null
+++ b/hw/uefi/var-service-isa.c
@@ -0,0 +1,88 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * uefi vars device - ISA variant for x64.
+ */
+#include "qemu/osdep.h"
+#include "migration/vmstate.h"
+
+#include "hw/isa/isa.h"
+#include "hw/qdev-properties.h"
+
+#include "hw/uefi/var-service.h"
+#include "hw/uefi/var-service-api.h"
+
+#define TYPE_UEFI_VARS_ISA "uefi-vars-isa"
+OBJECT_DECLARE_SIMPLE_TYPE(uefi_vars_isa_state, UEFI_VARS_ISA)
+
+struct uefi_vars_isa_state {
+    ISADevice parent_obj;
+    struct uefi_vars_state state;
+};
+
+static const VMStateDescription vmstate_uefi_vars_isa = {
+    .name = "uefi-vars-isa",
+    .fields = (VMStateField[]) {
+        VMSTATE_STRUCT(state, uefi_vars_isa_state, 0,
+                       vmstate_uefi_vars, uefi_vars_state),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property uefi_vars_isa_properties[] = {
+    DEFINE_PROP_SIZE("size", uefi_vars_isa_state, state.max_storage,
+                     256 * 1024),
+    DEFINE_PROP_STRING("jsonfile", uefi_vars_isa_state, state.jsonfile),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void uefi_vars_isa_init(Object *obj)
+{
+    uefi_vars_isa_state *uv = UEFI_VARS_ISA(obj);
+
+    uefi_vars_init(obj, &uv->state);
+}
+
+static void uefi_vars_isa_reset(DeviceState *dev)
+{
+    uefi_vars_isa_state *uv = UEFI_VARS_ISA(dev);
+
+    uefi_vars_hard_reset(&uv->state);
+}
+
+static void uefi_vars_isa_realize(DeviceState *dev, Error **errp)
+{
+    uefi_vars_isa_state *uv = UEFI_VARS_ISA(dev);
+    ISADevice *isa = ISA_DEVICE(dev);
+
+    isa_register_ioport(isa, &uv->state.mr, UEFI_VARS_IO_BASE);
+    uefi_vars_realize(&uv->state, errp);
+}
+
+static void uefi_vars_isa_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = uefi_vars_isa_realize;
+    dc->reset = uefi_vars_isa_reset;
+    dc->vmsd = &vmstate_uefi_vars_isa;
+    device_class_set_props(dc, uefi_vars_isa_properties);
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo uefi_vars_isa_info = {
+    .name          = TYPE_UEFI_VARS_ISA,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(uefi_vars_isa_state),
+    .instance_init = uefi_vars_isa_init,
+    .class_init    = uefi_vars_isa_class_init,
+};
+module_obj(TYPE_UEFI_VARS_ISA);
+module_dep("hw-uefi-vars");
+
+static void uefi_vars_isa_register_types(void)
+{
+    type_register_static(&uefi_vars_isa_info);
+}
+
+type_init(uefi_vars_isa_register_types)
diff --git a/hw/uefi/Kconfig b/hw/uefi/Kconfig
index ca6c2bc46a96..feb9f6de5e30 100644
--- a/hw/uefi/Kconfig
+++ b/hw/uefi/Kconfig
@@ -1,3 +1,9 @@
 config UEFI_VARS
 	bool
         default y if X86_64 || AARCH64
+
+config UEFI_VARS_ISA
+	bool
+        default y
+        depends on UEFI_VARS
+        depends on ISA_BUS
diff --git a/hw/uefi/meson.build b/hw/uefi/meson.build
index dc363d67cccc..959d2a630bbf 100644
--- a/hw/uefi/meson.build
+++ b/hw/uefi/meson.build
@@ -8,6 +8,11 @@ uefi_vars_ss.add(when: 'CONFIG_UEFI_VARS',
                                 'var-service-policy.c',
                                 'var-service-sysbus.c'))
 
+uefi_vars_isa_ss = ss.source_set()
+uefi_vars_isa_ss.add(when: 'CONFIG_UEFI_VARS_ISA',
+                     if_true: files('var-service-isa.c'))
+
 modules += { 'hw-uefi' : {
     'vars'     : uefi_vars_ss,
+    'vars-isa' : uefi_vars_isa_ss,
 }}
-- 
2.41.0