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usb/vmstate: add parent dev path

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... to make vmstate id string truely unique with multiple host
controllers, i.e. move from "1/usb-ptr" to "0000:00:01.3/1/usb-ptr"
(usb tabled connected to piix3 uhci).

This obviously breaks migration.  To handle this the usb bus
property "full-path" is added.  When setting this to false old
behavior is maintained.  This way current qemu will be compatible
with old versions when started using '-M pc-$oldversion'.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-08-22 09:09:51 +02:00
parent 158fd3ce98
commit eeb0cf9abf
3 changed files with 25 additions and 1 deletions
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4
hw/pc_piix.c
View File

@ -377,6 +377,10 @@ static QEMUMachine pc_machine_v1_1 = {
.driver = "apic",\
.property = "vapic",\
.value = "off",\
},{\
.driver = "USB",\
.property = "full-path",\
.value = "no",\
}
static QEMUMachine pc_machine_v1_0 = {

5
hw/usb.h
View File

@ -182,12 +182,17 @@ struct USBEndpoint {
QTAILQ_HEAD(, USBPacket) queue;
};
enum USBDeviceFlags {
USB_DEV_FLAG_FULL_PATH,
};
/* definition of a USB device */
struct USBDevice {
DeviceState qdev;
USBPort *port;
char *port_path;
void *opaque;
uint32_t flags;
/* Actual connected speed */
int speed;

15
hw/usb/bus.c
View File

@ -19,6 +19,8 @@ static struct BusInfo usb_bus_info = {
.get_fw_dev_path = usb_get_fw_dev_path,
.props = (Property[]) {
DEFINE_PROP_STRING("port", USBDevice, port_path),
DEFINE_PROP_BIT("full-path", USBDevice, flags,
USB_DEV_FLAG_FULL_PATH, true),
DEFINE_PROP_END_OF_LIST()
},
};
@ -460,8 +462,21 @@ static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
static char *usb_get_dev_path(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
DeviceState *hcd = qdev->parent_bus->parent;
char *id = NULL;
if ((dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) &&
hcd && hcd->parent_bus && hcd->parent_bus->info->get_dev_path) {
id = hcd->parent_bus->info->get_dev_path(hcd);
}
if (id) {
char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
g_free(id);
return ret;
} else {
return g_strdup(dev->port->path);
}
}
static char *usb_get_fw_dev_path(DeviceState *qdev)
{