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usb-host: live migration support for the libusb version 

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-04-24 14:29:08 +02:00
parent b5803aa358
commit 95efb20c71
1 changed files with 49 additions and 5 deletions
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54
hw/usb/host-libusb.c
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@ -94,7 +94,8 @@ struct USBHostDevice {
} ifs[USB_MAX_INTERFACES];
/* callbacks & friends */
QEMUBH *bh;
QEMUBH *bh_nodev;
QEMUBH *bh_postld;
Notifier exit;
/* request queues */
@ -835,10 +836,10 @@ static void usb_host_nodev_bh(void *opaque)
static void usb_host_nodev(USBHostDevice *s)
{
if (!s->bh) {
s->bh = qemu_bh_new(usb_host_nodev_bh, s);
if (!s->bh_nodev) {
s->bh_nodev = qemu_bh_new(usb_host_nodev_bh, s);
}
qemu_bh_schedule(s->bh);
qemu_bh_schedule(s->bh_nodev);
}
static void usb_host_exit_notifier(struct Notifier *n, void *data)
@ -1228,9 +1229,52 @@ static void usb_host_handle_reset(USBDevice *udev)
usb_host_ep_update(s);
}
/*
* This is *NOT* about restoring state. We have absolutely no idea
* what state the host device is in at the moment and whenever it is
* still present in the first place. Attemping to contine where we
* left off is impossible.
*
* What we are going to to to here is emulate a surprise removal of
* the usb device passed through, then kick host scan so the device
* will get re-attached (and re-initialized by the guest) in case it
* is still present.
*
* As the device removal will change the state of other devices (usb
* host controller, most likely interrupt controller too) we have to
* wait with it until *all* vmstate is loaded. Thus post_load just
* kicks a bottom half which then does the actual work.
*/
static void usb_host_post_load_bh(void *opaque)
{
USBHostDevice *dev = opaque;
USBDevice *udev = USB_DEVICE(dev);
if (dev->dh != NULL) {
usb_host_close(dev);
}
if (udev->attached) {
usb_device_detach(udev);
}
usb_host_auto_check(NULL);
}
static int usb_host_post_load(void *opaque, int version_id)
{
USBHostDevice *dev = opaque;
if (!dev->bh_postld) {
dev->bh_postld = qemu_bh_new(usb_host_post_load_bh, dev);
}
qemu_bh_schedule(dev->bh_postld);
return 0;
}
static const VMStateDescription vmstate_usb_host = {
.name = "usb-host",
.unmigratable = 1,
.version_id = 1,
.minimum_version_id = 1,
.post_load = usb_host_post_load,
.fields = (VMStateField[]) {
VMSTATE_USB_DEVICE(parent_obj, USBHostDevice),
VMSTATE_END_OF_LIST()