Introduce HostIOMMUDevice as an abstraction of host IOMMU device.
Introduce .realize() to initialize HostIOMMUDevice further after
instance init.
Introduce a macro CONFIG_HOST_IOMMU_DEVICE to define the usage
for VFIO, and VDPA in the future.
Suggested-by: Cédric Le Goater <c...@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
MAINTAINERS | 2 ++
include/sysemu/host_iommu_device.h | 51 ++++++++++++++++++++++++++++++
backends/host_iommu_device.c | 30 ++++++++++++++++++
backends/Kconfig | 5 +++
backends/meson.build | 1 +
5 files changed, 89 insertions(+)
create mode 100644 include/sysemu/host_iommu_device.h
create mode 100644 backends/host_iommu_device.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 448dc951c5..1cf2b25beb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2196,6 +2196,8 @@ M: Zhenzhong Duan <zhenzhong.d...@intel.com>
S: Supported
F: backends/iommufd.c
F: include/sysemu/iommufd.h
+F: backends/host_iommu_device.c
+F: include/sysemu/host_iommu_device.h
F: include/qemu/chardev_open.h
F: util/chardev_open.c
F: docs/devel/vfio-iommufd.rst
diff --git a/include/sysemu/host_iommu_device.h
b/include/sysemu/host_iommu_device.h
new file mode 100644
index 0000000000..2b58a94d62
--- /dev/null
+++ b/include/sysemu/host_iommu_device.h
@@ -0,0 +1,51 @@
+/*
+ * Host IOMMU device abstract declaration
+ *
+ * Copyright (C) 2024 Intel Corporation.
+ *
+ * Authors: Zhenzhong Duan <zhenzhong.d...@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef HOST_IOMMU_DEVICE_H
+#define HOST_IOMMU_DEVICE_H
+
+#include "qom/object.h"
+#include "qapi/error.h"
+
+#define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
+OBJECT_DECLARE_TYPE(HostIOMMUDevice, HostIOMMUDeviceClass, HOST_IOMMU_DEVICE)
+
+struct HostIOMMUDevice {
+ Object parent_obj;
+};
+
+/**
+ * struct HostIOMMUDeviceClass - The base class for all host IOMMU devices.
+ *
+ * Different type of host devices (e.g., VFIO or VDPA device) or devices
+ * with different backend (e.g., VFIO legacy container or IOMMUFD backend)
+ * can have different sub-classes.
+ */
+struct HostIOMMUDeviceClass {
+ ObjectClass parent_class;
+
+ /**
+ * @realize: initialize host IOMMU device instance further.
+ *
+ * Mandatory callback.
+ *
+ * @hiod: pointer to a host IOMMU device instance.
+ *
+ * @opaque: pointer to agent device of this host IOMMU device,
+ * i.e., for VFIO, pointer to VFIODevice
+ *
+ * @errp: pass an Error out when realize fails.
+ *
+ * Returns: true on success, false on failure.
+ */
+ bool (*realize)(HostIOMMUDevice *hiod, void *opaque, Error **errp);
+};
+#endif
diff --git a/backends/host_iommu_device.c b/backends/host_iommu_device.c
new file mode 100644
index 0000000000..41f2fdce20
--- /dev/null
+++ b/backends/host_iommu_device.c
@@ -0,0 +1,30 @@
+/*
+ * Host IOMMU device abstract
+ *
+ * Copyright (C) 2024 Intel Corporation.
+ *
+ * Authors: Zhenzhong Duan <zhenzhong.d...@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/host_iommu_device.h"
+
+OBJECT_DEFINE_ABSTRACT_TYPE(HostIOMMUDevice,
+ host_iommu_device,
+ HOST_IOMMU_DEVICE,
+ OBJECT)
+
+static void host_iommu_device_class_init(ObjectClass *oc, void *data)
+{
+}
+
+static void host_iommu_device_init(Object *obj)
+{
+}
+
+static void host_iommu_device_finalize(Object *obj)
+{
+}
diff --git a/backends/Kconfig b/backends/Kconfig
index 2cb23f62fa..34ab29e994 100644
--- a/backends/Kconfig
+++ b/backends/Kconfig
@@ -3,3 +3,8 @@ source tpm/Kconfig
config IOMMUFD
bool
depends on VFIO
+
+config HOST_IOMMU_DEVICE
+ bool
+ default y
+ depends on VFIO
diff --git a/backends/meson.build b/backends/meson.build
index 8b2b111497..2e975d641e 100644
--- a/backends/meson.build
+++ b/backends/meson.build
@@ -25,6 +25,7 @@ if have_vhost_user
endif
system_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true:
files('cryptodev-vhost.c'))
system_ss.add(when: 'CONFIG_IOMMUFD', if_true: files('iommufd.c'))
+system_ss.add(when: 'CONFIG_HOST_IOMMU_DEVICE', if_true:
files('host_iommu_device.c'))
if have_vhost_user_crypto
system_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true:
files('cryptodev-vhost-user.c'))
endif
--
2.34.1
