qemu/hw/usb
Alexander Kappner ba4c735b4f Introduce new "no_guest_reset" parameter for usb-host device
With certain USB devices passed through via usb-host, a guest attempting to
reset a usb-host device can trigger a reset loop that renders the USB device
unusable. In my use case, the device was an iPhone XR that was passed through to
a Mac OS X Mojave guest. Upon connecting the device, the following happens:

1) Guest recognizes new device, sends reset to emulated USB host
2) QEMU's USB host sends reset to host kernel
3) Host kernel resets device
4) After reset, host kernel determines that some part of the device descriptor
has changed ("device firmware changed" in dmesg), so host kernel decides to
re-enumerate the device.
5) Re-enumeration causes QEMU to disconnect and reconnect the device in the
guest.
6) goto 1)

Here's from the host kernel (note the "device firmware changed" lines")

[3677704.473050] usb 1-1.3: new high-speed USB device number 53 using ehci-pci
[3677704.555594] usb 1-1.3: New USB device found, idVendor=05ac, idProduct=12a8, bcdDevice=11.08
[3677704.555599] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3677704.555602] usb 1-1.3: Product: iPhone
[3677704.555605] usb 1-1.3: Manufacturer: Apple Inc.
[3677704.555607] usb 1-1.3: SerialNumber: [[removed]]
[3677709.401040] usb 1-1.3: reset high-speed USB device number 53 using ehci-pci
[3677709.479486] usb 1-1.3: device firmware changed
[3677709.479842] usb 1-1.3: USB disconnect, device number 53
[3677709.546039] usb 1-1.3: new high-speed USB device number 54 using ehci-pci
[3677709.627471] usb 1-1.3: New USB device found, idVendor=05ac, idProduct=12a8, bcdDevice=11.08
[3677709.627476] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3677709.627479] usb 1-1.3: Product: iPhone
[3677709.627481] usb 1-1.3: Manufacturer: Apple Inc.
[3677709.627483] usb 1-1.3: SerialNumber: [[removed]]
[3677762.320044] usb 1-1.3: reset high-speed USB device number 54 using ehci-pci
[3677762.615630] usb 1-1.3: USB disconnect, device number 54
[3677762.787043] usb 1-1.3: new high-speed USB device number 55 using ehci-pci
[3677762.869016] usb 1-1.3: New USB device found, idVendor=05ac, idProduct=12a8, bcdDevice=11.08
[3677762.869024] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3677762.869028] usb 1-1.3: Product: iPhone
[3677762.869032] usb 1-1.3: Manufacturer: Apple Inc.
[3677762.869035] usb 1-1.3: SerialNumber: [[removed]]
[3677815.662036] usb 1-1.3: reset high-speed USB device number 55 using ehci-pci

Here's from QEMU:

libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/005/022: No such file or directory
libusb: error [udev_hotplug_event] ignoring udev action bind
libusb: error [udev_hotplug_event] ignoring udev action bind
libusb: error [_open_sysfs_attr] open /sys/bus/usb/devices/5-1/bConfigurationValue failed ret=-1 errno=2
libusb: error [_get_usbfs_fd] File doesn't exist, wait 10 ms and try again

libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/005/024: No such file or directory
libusb: error [udev_hotplug_event] ignoring udev action bind
libusb: error [udev_hotplug_event] ignoring udev action bind
libusb: error [_open_sysfs_attr] open /sys/bus/usb/devices/5-1/bConfigurationValue failed ret=-1 errno=2
libusb: error [_get_usbfs_fd] File doesn't exist, wait 10 ms and try again

libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/005/026: No such file or directory

The result of this is that the device remains permanently unusable in the guest.
The same problem has been previously reported for an iPad:
https://stackoverflow.com/questions/52617634/how-do-i-get-qemu-usb-passthrough-to-work-for-ipad-iphone

This problem can be elegantly solved by interrupting step 2) above. Instead of
passing through the reset, QEMU simply ignores it. To allow this to be
configured on a per-device level,  a new parameter "no_guest_reset" is
introduced for the usb-host device. I can confirm that the configuration
described above (iPhone XS + Mojave guest) works flawlessly with
no_guest_reset=True specified.

Working command line for my scenario:
device_add usb-host,vendorid=0x05ac,productid=0x12a8,no_guest_reset=True,id=iphone

Best regards
Alexander

Signed-off-by: Alexander Kappner <agk@godking.net>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20190128140027.9448-1-kraxel@redhat.com

[ kraxel: rename parameter to "guest-reset" ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-03-07 10:03:54 +01:00
..
Makefile.objs usb: Add basic code to emulate Chipidea USB IP 2018-02-09 10:40:30 +00:00
bus.c usb: drop unnecessary usb_device_post_load checks 2019-01-08 12:37:52 +01:00
ccid-card-emulated.c qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
ccid-card-passthru.c hw/usb: Use the IEC binary prefix definitions 2018-07-02 15:41:16 +02:00
ccid.h usb-ccid: convert CCIDCardClass::exitfn() -> unrealize() 2018-01-26 07:59:33 +01:00
chipidea.c usb: Add basic code to emulate Chipidea USB IP 2018-02-09 10:40:30 +00:00
combined-packet.c hw/usb: Fix LGPL information in the file headers 2019-01-30 06:47:52 +01:00
core.c usb: remove unnecessary NULL device check from usb_ep_get() 2019-02-20 09:41:23 +01:00
desc-msos.c usb: use local path for local headers 2018-06-01 19:20:38 +03:00
desc.c usb: use local path for local headers 2018-06-01 19:20:38 +03:00
desc.h all: Clean up includes 2016-02-23 12:43:05 +00:00
dev-audio.c usb-audio: ignore usb packages with wrong size 2019-01-10 09:56:19 +01:00
dev-bluetooth.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
dev-hid.c usb: assign unique serial numbers to hid devices 2019-01-30 06:47:52 +01:00
dev-hub.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
dev-mtp.c usb-mtp: prevent null dereference while deleting objects 2019-03-07 10:02:48 +01:00
dev-network.c qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
dev-serial.c char: allow specifying a GMainContext at opening time 2019-02-13 14:23:39 +01:00
dev-smartcard-reader.c qdev: pass an Object * to qbus_set_hotplug_handler() 2019-02-17 21:54:02 +11:00
dev-storage.c block: Remove deprecated -drive option serial 2018-08-15 12:50:39 +02:00
dev-uas.c Revert "usb: release the created buses" 2018-06-18 09:15:51 +02:00
dev-wacom.c usb: use local path for local headers 2018-06-01 19:20:38 +03:00
hcd-ehci-pci.c hw/usb: Fix LGPL information in the file headers 2019-01-30 06:47:52 +01:00
hcd-ehci-sysbus.c hw/usb: Fix LGPL information in the file headers 2019-01-30 06:47:52 +01:00
hcd-ehci.c ehci: check device is not NULL before calling usb_ep_get() 2019-02-20 09:41:23 +01:00
hcd-ehci.h hw/usb: Fix LGPL information in the file headers 2019-01-30 06:47:52 +01:00
hcd-musb.c usb: check device is not NULL before calling usb_ep_get() 2019-02-20 09:41:23 +01:00
hcd-ohci.c ohci: check device is not NULL before calling usb_ep_get() 2019-02-20 09:41:23 +01:00
hcd-uhci.c uhci: check device is not NULL before calling usb_ep_get() 2019-02-20 09:41:23 +01:00
hcd-xhci-nec.c xhci: split into multiple files 2017-05-29 14:03:35 +02:00
hcd-xhci.c xhci: check device is not NULL before calling usb_ep_get() 2019-02-20 09:41:23 +01:00
hcd-xhci.h usb: implement XHCI underrun/overrun events 2019-01-30 06:47:52 +01:00
host-libusb.c Introduce new "no_guest_reset" parameter for usb-host device 2019-03-07 10:03:54 +01:00
host-stub.c usb: Remove legacy -usbdevice options (host, serial, disk and net) 2018-01-26 07:15:08 +01:00
host.h usb-host: move legacy cmd line bits 2013-02-19 12:30:05 +01:00
libhw.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
quirks-ftdi-ids.h usbredir: Add support for buffered bulk input (v2) 2013-01-08 10:56:58 +01:00
quirks-pl2303-ids.h usbredir: Add support for buffered bulk input (v2) 2013-01-08 10:56:58 +01:00
quirks.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
quirks.h usbredir: Add support for buffered bulk input (v2) 2013-01-08 10:56:58 +01:00
redirect.c usb: add device checks before redirector calls to usb_ep_get() 2019-02-20 09:41:23 +01:00
trace-events hw/usb: switch MTP to use new inotify APIs 2019-02-26 15:25:58 +00:00
tusb6010.c usb/tusb6010: Convert sysbus init function to realize function 2018-12-13 13:48:02 +00:00
xen-usb.c xen: re-name XenDevice to XenLegacyDevice... 2019-01-14 13:45:40 +00:00