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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v8 02/18] xen: introduce new 'XenBus' and 'XenDevice' object hierarchy
This patch adds the basic boilerplate for a 'XenBus' object that will act
as a parent to 'XenDevice' PV backends.
A new 'XenBridge' object is also added to connect XenBus to the system bus.
The XenBus object is instantiated by a new xen_bus_init() function called
from the same sites as the legacy xen_be_init() function.
Subsequent patches will flesh-out the functionality of these objects.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Reviewed-by: Anthony Perard <anthony.perard@xxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Marcel Apfelbaum <marcel.apfelbaum@xxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Eduardo Habkost <ehabkost@xxxxxxxxxx>
v3:
- Don't use local_err unless it is needed
v2:
- Fix boilerplate
- Make xen-bus hotplug capable
---
hw/i386/xen/xen-hvm.c | 3 +
hw/xen/Makefile.objs | 2 +-
hw/xen/trace-events | 6 ++
hw/xen/xen-bus.c | 127 ++++++++++++++++++++++++++++++++++++++
hw/xenpv/xen_machine_pv.c | 3 +
include/hw/xen/xen-bus.h | 55 +++++++++++++++++
6 files changed, 195 insertions(+), 1 deletion(-)
create mode 100644 hw/xen/xen-bus.c
create mode 100644 include/hw/xen/xen-bus.h
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 6ef31571c8..497e685d40 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -17,6 +17,7 @@
#include "hw/i386/apic-msidef.h"
#include "hw/xen/xen_common.h"
#include "hw/xen/xen-legacy-backend.h"
+#include "hw/xen/xen-bus.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
#include "qemu/error-report.h"
@@ -1484,6 +1485,8 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion
**ram_memory)
QLIST_INIT(&state->dev_list);
device_listener_register(&state->device_listener);
+ xen_bus_init();
+
/* Initialize backend core & drivers */
if (xen_be_init() != 0) {
error_report("xen backend core setup failed");
diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
index 3f64a44051..d9d6d7b4f9 100644
--- a/hw/xen/Makefile.objs
+++ b/hw/xen/Makefile.objs
@@ -1,5 +1,5 @@
# xen backend driver support
-common-obj-$(CONFIG_XEN) += xen-legacy-backend.o xen_devconfig.o xen_pvdev.o
xen-common.o
+common-obj-$(CONFIG_XEN) += xen-legacy-backend.o xen_devconfig.o xen_pvdev.o
xen-common.o xen-bus.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o
xen_pt_graphics.o xen_pt_msi.o
diff --git a/hw/xen/trace-events b/hw/xen/trace-events
index c7e7a3b523..0172cd4e26 100644
--- a/hw/xen/trace-events
+++ b/hw/xen/trace-events
@@ -12,3 +12,9 @@ xen_unmap_portio_range(uint32_t id, uint64_t start_addr,
uint64_t end_addr) "id:
xen_map_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u
bdf: %02x.%02x.%02x"
xen_unmap_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u
bdf: %02x.%02x.%02x"
xen_domid_restrict(int err) "err: %u"
+
+# include/hw/xen/xen-bus.c
+xen_bus_realize(void) ""
+xen_bus_unrealize(void) ""
+xen_device_realize(const char *type) "type: %s"
+xen_device_unrealize(const char *type) "type: %s"
diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
new file mode 100644
index 0000000000..bc04da748b
--- /dev/null
+++ b/hw/xen/xen-bus.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2018 Citrix Systems Inc.
+ *
+ * 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 "qemu/osdep.h"
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/xen/xen-bus.h"
+#include "qapi/error.h"
+#include "trace.h"
+
+static void xen_bus_unrealize(BusState *bus, Error **errp)
+{
+ trace_xen_bus_unrealize();
+}
+
+static void xen_bus_realize(BusState *bus, Error **errp)
+{
+ trace_xen_bus_realize();
+}
+
+static void xen_bus_class_init(ObjectClass *class, void *data)
+{
+ BusClass *bus_class = BUS_CLASS(class);
+
+ bus_class->realize = xen_bus_realize;
+ bus_class->unrealize = xen_bus_unrealize;
+}
+
+static const TypeInfo xen_bus_type_info = {
+ .name = TYPE_XEN_BUS,
+ .parent = TYPE_BUS,
+ .instance_size = sizeof(XenBus),
+ .class_size = sizeof(XenBusClass),
+ .class_init = xen_bus_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { TYPE_HOTPLUG_HANDLER },
+ { }
+ },
+};
+
+static void xen_device_unrealize(DeviceState *dev, Error **errp)
+{
+ XenDevice *xendev = XEN_DEVICE(dev);
+ XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
+ const char *type = object_get_typename(OBJECT(xendev));
+
+ trace_xen_device_unrealize(type);
+
+ if (xendev_class->unrealize) {
+ xendev_class->unrealize(xendev, errp);
+ }
+}
+
+static void xen_device_realize(DeviceState *dev, Error **errp)
+{
+ XenDevice *xendev = XEN_DEVICE(dev);
+ XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
+ const char *type = object_get_typename(OBJECT(xendev));
+ Error *local_err = NULL;
+
+ trace_xen_device_realize(type);
+
+ if (xendev_class->realize) {
+ xendev_class->realize(xendev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto unrealize;
+ }
+ }
+
+ return;
+
+unrealize:
+ xen_device_unrealize(dev, &error_abort);
+}
+
+static void xen_device_class_init(ObjectClass *class, void *data)
+{
+ DeviceClass *dev_class = DEVICE_CLASS(class);
+
+ dev_class->realize = xen_device_realize;
+ dev_class->unrealize = xen_device_unrealize;
+ dev_class->bus_type = TYPE_XEN_BUS;
+}
+
+static const TypeInfo xen_device_type_info = {
+ .name = TYPE_XEN_DEVICE,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(XenDevice),
+ .abstract = true,
+ .class_size = sizeof(XenDeviceClass),
+ .class_init = xen_device_class_init,
+};
+
+typedef struct XenBridge {
+ SysBusDevice busdev;
+} XenBridge;
+
+#define TYPE_XEN_BRIDGE "xen-bridge"
+
+static const TypeInfo xen_bridge_type_info = {
+ .name = TYPE_XEN_BRIDGE,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(XenBridge),
+};
+
+static void xen_register_types(void)
+{
+ type_register_static(&xen_bridge_type_info);
+ type_register_static(&xen_bus_type_info);
+ type_register_static(&xen_device_type_info);
+}
+
+type_init(xen_register_types)
+
+void xen_bus_init(void)
+{
+ DeviceState *dev = qdev_create(NULL, TYPE_XEN_BRIDGE);
+ BusState *bus = qbus_create(TYPE_XEN_BUS, dev, NULL);
+
+ qdev_init_nofail(dev);
+ qbus_set_bus_hotplug_handler(bus, &error_abort);
+}
diff --git a/hw/xenpv/xen_machine_pv.c b/hw/xenpv/xen_machine_pv.c
index 8c86fb7031..608e591bcc 100644
--- a/hw/xenpv/xen_machine_pv.c
+++ b/hw/xenpv/xen_machine_pv.c
@@ -27,6 +27,7 @@
#include "hw/hw.h"
#include "hw/boards.h"
#include "hw/xen/xen-legacy-backend.h"
+#include "hw/xen/xen-bus.h"
#include "xen_domainbuild.h"
#include "sysemu/block-backend.h"
@@ -93,6 +94,8 @@ static void xen_init_pv(MachineState *machine)
xen_config_dev_nic(nd_table + i);
}
+ xen_bus_init();
+
/* config cleanup hook */
atexit(xen_config_cleanup);
}
diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h
new file mode 100644
index 0000000000..0cb12464ce
--- /dev/null
+++ b/include/hw/xen/xen-bus.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018 Citrix Systems Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_XEN_BUS_H
+#define HW_XEN_BUS_H
+
+#include "hw/sysbus.h"
+
+typedef struct XenDevice {
+ DeviceState qdev;
+} XenDevice;
+
+typedef void (*XenDeviceRealize)(XenDevice *xendev, Error **errp);
+typedef void (*XenDeviceUnrealize)(XenDevice *xendev, Error **errp);
+
+typedef struct XenDeviceClass {
+ /*< private >*/
+ DeviceClass parent_class;
+ /*< public >*/
+ XenDeviceRealize realize;
+ XenDeviceUnrealize unrealize;
+} XenDeviceClass;
+
+#define TYPE_XEN_DEVICE "xen-device"
+#define XEN_DEVICE(obj) \
+ OBJECT_CHECK(XenDevice, (obj), TYPE_XEN_DEVICE)
+#define XEN_DEVICE_CLASS(class) \
+ OBJECT_CLASS_CHECK(XenDeviceClass, (class), TYPE_XEN_DEVICE)
+#define XEN_DEVICE_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(XenDeviceClass, (obj), TYPE_XEN_DEVICE)
+
+typedef struct XenBus {
+ BusState qbus;
+} XenBus;
+
+typedef struct XenBusClass {
+ /*< private >*/
+ BusClass parent_class;
+} XenBusClass;
+
+#define TYPE_XEN_BUS "xen-bus"
+#define XEN_BUS(obj) \
+ OBJECT_CHECK(XenBus, (obj), TYPE_XEN_BUS)
+#define XEN_BUS_CLASS(class) \
+ OBJECT_CLASS_CHECK(XenBusClass, (class), TYPE_XEN_BUS)
+#define XEN_BUS_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(XenBusClass, (obj), TYPE_XEN_BUS)
+
+void xen_bus_init(void);
+
+#endif /* HW_XEN_BUS_H */
--
2.20.1.2.gb21ebb6
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