x86-iommu: introduce parent class

Introducing parent class for intel-iommu devices named "x86-iommu". This
is preparation work to abstract shared functionalities out from Intel
and AMD IOMMUs. Currently, only the parent class is introduced. It does
nothing yet.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 57 insertions, 3 deletions

diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index b52d5b8756..90e94ffefd 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -2,7 +2,7 @@ obj-$(CONFIG_KVM) += kvm/
 obj-y += multiboot.o
 obj-y += pc.o pc_piix.o pc_q35.o
 obj-y += pc_sysfw.o
-obj-y += intel_iommu.o
+obj-y += x86-iommu.o intel_iommu.o
 obj-$(CONFIG_XEN) += ../xenpv/ xen/
 
 obj-y += kvmvapic.o
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 464f2a0518..a430d7de1c 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2061,17 +2061,18 @@ static void vtd_realize(DeviceState *dev, Error **errp)
 static void vtd_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
+    X86IOMMUClass *x86_class = X86_IOMMU_CLASS(klass);
 
     dc->reset = vtd_reset;
-    dc->realize = vtd_realize;
     dc->vmsd = &vtd_vmstate;
     dc->props = vtd_properties;
     dc->hotpluggable = false;
+    x86_class->realize = vtd_realize;
 }
 
 static const TypeInfo vtd_info = {
     .name          = TYPE_INTEL_IOMMU_DEVICE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_X86_IOMMU_DEVICE,
     .instance_size = sizeof(IntelIOMMUState),
     .class_init    = vtd_class_init,
 };
diff --git a/hw/i386/x86-iommu.c b/hw/i386/x86-iommu.c
new file mode 100644
index 0000000000..d739afb141
--- /dev/null
+++ b/hw/i386/x86-iommu.c
@@ -0,0 +1,53 @@
+/*
+ * QEMU emulation of common X86 IOMMU
+ *
+ * Copyright (C) 2016 Peter Xu, Red Hat <peterx@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+#include "hw/boards.h"
+#include "hw/i386/x86-iommu.h"
+
+static void x86_iommu_realize(DeviceState *dev, Error **errp)
+{
+    X86IOMMUClass *x86_class = X86_IOMMU_GET_CLASS(dev);
+    if (x86_class->realize) {
+        x86_class->realize(dev, errp);
+    }
+}
+
+static void x86_iommu_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    dc->realize = x86_iommu_realize;
+}
+
+static const TypeInfo x86_iommu_info = {
+    .name          = TYPE_X86_IOMMU_DEVICE,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(X86IOMMUState),
+    .class_init    = x86_iommu_class_init,
+    .class_size    = sizeof(X86IOMMUClass),
+    .abstract      = true,
+};
+
+static void x86_iommu_register_types(void)
+{
+    type_register_static(&x86_iommu_info);
+}
+
+type_init(x86_iommu_register_types)