On Tue, Nov 23, 2021 at 02:20:47PM +0100, Juergen Gross wrote:

Introduces the Xen pvUSB frontend. With pvUSB it is possible for a Xen
domU to communicate with a USB device assigned to that domU. The
communication is all done via the pvUSB backend in a driver domain
(usually Dom0) which is owner of the physical device.

The pvUSB frontend is a USB hcd for a virtual USB host connector.

The code is taken from the pvUSB implementation in Xen done by Fujitsu
based on Linux kernel 2.6.18.

Changes from the original version are:
- port to upstream kernel
- put all code in just one source file
- move module to appropriate location in kernel tree
- adapt to Linux style guide
- minor code modifications to increase readability

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 drivers/usb/host/Kconfig   |   11 +
 drivers/usb/host/Makefile  |    1 +
 drivers/usb/host/xen-hcd.c | 1606 ++++++++++++++++++++++++++++++++++++
 3 files changed, 1618 insertions(+)
 create mode 100644 drivers/usb/host/xen-hcd.c

This looks sane to me, but I don't know the HCD interface as well as
others on linux-usb do, like Alan Stern.

What tree do you want this to be merged through, my USB one?

thanks,

greg k-h