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SubjectRe: [Xen-devel] [Patch V4 0/3] xen, usb: support pvUSB frontend driver
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Hi Oleksandr,

On 17/03/16 20:43, Oleksandr Tyshchenko wrote:
> Hi Juergen, All.
>
> I would like to apply PVUSB drivers for using in our platform while
> PVUSB stuff doesn't reach upstream.
>
> Unfortunately, I couldn't find more recent version of "kernel based"
> backend driver in mailing list.
> I have found it in v0 only.
>
> [Xen-devel] [PATCH 0/4] xen, usb: support pvUSB drivers
> <http://lists.xenproject.org/archives/html/xen-devel/2015-02/msg03245.html>
>
> Can I use this frontend driver (v4) together with kernel based backend
> driver (v0)?
> Are they fully compatible with each other?

I didn't send any further version as it was regarded to be better to
provide such a backend via qemu (patches are being reviewed right now,
I sent them last week).

Regarding compatibility: should work. I've tested all possible
combinations of frontends/backends with both my upstream variants
you are referring to and the SUSE SLE variants which are kernel-xen
specific and SUSE-only.

You should be aware, however, that there might be some bugs in the
v0 backend driver. It was tested by me only.

> Thank you.

You're welcome. :-)


Juergen

>
> On Mon, Jul 20, 2015 at 8:13 AM, Juergen Gross <jgross@suse.com
> <mailto:jgross@suse.com>> wrote:
>
> Ping?
>
>
> On 06/23/2015 08:53 AM, Juergen Gross wrote:
>
> This series adds XEN guest pvUSB support. With pvUSB it is
> possible to
> use physical USB devices from a XEN domain.
>
> The support consists of a frontend in form of a virtual hcd
> driver in
> the unprivileged domU passing I/O-requests to the backend in a
> driver
> domain (usually Dom0). The backend is not part of this patch series,
> as it will be supported via qemu.
>
> The code is taken (and adapted) from the original pvUSB
> implementation
> done for Linux 2.6 in 2008 by Fujitsu.
>
> Normal operation of USB devices by adding and removing them
> dynamically
> to/from a domain has been tested using various USB devices (USB 1.1,
> 2.0 and 3.0). The pvUSB backend for these tests was a SUSE SLES Dom0
> with a kernel based backend driver.
>
> Changes in V4:
> - remove sysfs file from frontend, as it violated the "one value
> per file"
> rule and didn't serve any real purpose.
>
> Changes in V3:
> - move frontend to drivers/usb/host and rename it to xen-hcd.
> - changed name prefixes in patch 1 to "xenusb" as requested by Greg
> - use __u<n> types rather than uint<n>_t as requested by Greg
>
> Changes in V2:
> - removed backend, as it can be implemented in user land
> - added some access macros and definitions to the pvUSB interface
> description to make it independant from linux kernel USB
> internals
> - adapted frontend to newer kernel version and use new pvUSB
> interface macros
> - set port status in one chunk as suggested by Oliver Neukum
>
>
> Juergen Gross (3):
> usb: Add Xen pvUSB protocol description
> usb: Introduce Xen pvUSB frontend (xen hcd)
> xen: add Xen pvUSB maintainer
>
> MAINTAINERS | 8 +
> drivers/usb/host/Kconfig | 11 +
> drivers/usb/host/Makefile | 1 +
> drivers/usb/host/xen-hcd.c | 1594
> ++++++++++++++++++++++++++++++++++++++
> include/xen/interface/io/usbif.h | 252 ++++++
> 5 files changed, 1866 insertions(+)
> create mode 100644 drivers/usb/host/xen-hcd.c
> create mode 100644 include/xen/interface/io/usbif.h
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org <mailto:Xen-devel@lists.xen.org>
> http://lists.xen.org/xen-devel
>
>
>
>
> --
>
> Oleksandr Tyshchenko | Embedded Dev
> GlobalLogic
> www.globallogic.com <http://www.globallogic.com/>
> <http://www.globallogic.com/>

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