usb-host: live migration support
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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a844ed842d
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@ -111,6 +111,7 @@ typedef struct USBHostDevice {
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uint32_t iso_urb_count;
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uint32_t iso_urb_count;
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uint32_t options;
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uint32_t options;
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Notifier exit;
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Notifier exit;
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QEMUBH *bh;
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struct endp_data ep_in[USB_MAX_ENDPOINTS];
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struct endp_data ep_in[USB_MAX_ENDPOINTS];
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struct endp_data ep_out[USB_MAX_ENDPOINTS];
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struct endp_data ep_out[USB_MAX_ENDPOINTS];
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@ -1421,6 +1422,43 @@ static void usb_host_exit_notifier(struct Notifier *n, void *data)
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}
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}
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}
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}
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/*
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* This is *NOT* about restoring state. We have absolutely no idea
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* what state the host device is in at the moment and whenever it is
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* still present in the first place. Attemping to contine where we
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* left off is impossible.
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*
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* What we are going to to to here is emulate a surprise removal of
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* the usb device passed through, then kick host scan so the device
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* will get re-attached (and re-initialized by the guest) in case it
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* is still present.
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*
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* As the device removal will change the state of other devices (usb
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* host controller, most likely interrupt controller too) we have to
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* wait with it until *all* vmstate is loaded. Thus post_load just
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* kicks a bottom half which then does the actual work.
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*/
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static void usb_host_post_load_bh(void *opaque)
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{
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USBHostDevice *dev = opaque;
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if (dev->fd != -1) {
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usb_host_close(dev);
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}
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if (dev->dev.attached) {
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usb_device_detach(&dev->dev);
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}
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usb_host_auto_check(NULL);
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}
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static int usb_host_post_load(void *opaque, int version_id)
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{
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USBHostDevice *dev = opaque;
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qemu_bh_schedule(dev->bh);
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return 0;
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}
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static int usb_host_initfn(USBDevice *dev)
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static int usb_host_initfn(USBDevice *dev)
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{
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{
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USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev);
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USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev);
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@ -1432,6 +1470,7 @@ static int usb_host_initfn(USBDevice *dev)
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QTAILQ_INSERT_TAIL(&hostdevs, s, next);
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QTAILQ_INSERT_TAIL(&hostdevs, s, next);
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s->exit.notify = usb_host_exit_notifier;
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s->exit.notify = usb_host_exit_notifier;
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qemu_add_exit_notifier(&s->exit);
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qemu_add_exit_notifier(&s->exit);
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s->bh = qemu_bh_new(usb_host_post_load_bh, s);
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usb_host_auto_check(NULL);
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usb_host_auto_check(NULL);
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if (s->match.bus_num != 0 && s->match.port != NULL) {
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if (s->match.bus_num != 0 && s->match.port != NULL) {
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@ -1443,7 +1482,13 @@ static int usb_host_initfn(USBDevice *dev)
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static const VMStateDescription vmstate_usb_host = {
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static const VMStateDescription vmstate_usb_host = {
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.name = "usb-host",
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.name = "usb-host",
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.unmigratable = 1,
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.version_id = 1,
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.minimum_version_id = 1,
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.post_load = usb_host_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_USB_DEVICE(dev, USBHostDevice),
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VMSTATE_END_OF_LIST()
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}
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};
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};
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static Property usb_host_dev_properties[] = {
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static Property usb_host_dev_properties[] = {
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