Re: [Xen-devel] [PATCH V4 3/7] libxl: add pvusb API

[Juergen Gross <jgross@xxxxxxxx>]

On 06/18/2015 10:50 AM, Ian Campbell wrote:
> On Thu, 2015-06-18 at 09:02 +0200, Juergen Gross wrote:
> > On 06/18/2015 08:20 AM, Chun Yan Liu wrote:
> > > > > > On 6/17/2015 at 07:34 PM, in message <1434540857.13744.334.camel@xxxxxxxxxx>,
> > > Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> > > > On Tue, 2015-06-16 at 16:20 +0200, Juergen Gross wrote:
> > > > > My point was to avoid the sysfs accesses in libxl in order to support
> > > > > BSD as well and to reduce the complexity.
> > > > As a slight aside to this, can't libxl use libusb for a lot of this
> > > > stuff and therefore avoid being Linux specific?
> > > >
> > > > http://libusb.info/ claims to support "Linux, OS X, Windows, Windows CE,
> > > > Android, OpenBSD/NetBSD, Haiku.". Interestingly FreeBSD is missing there
> > > > but I don't think that need to be a blocker.
> > > >
> > > > I don't see a problem with adding libusb to our set of dependencies, and
> > > > it's certainly got to be better than (re)implementing a bunch of sysfs
> > > > stuff (which I presume is what libusb does under the hood anyway).
> > > Using libusb is certainly good and can save effort to implement things by
> > > ourself. Only one concern: some functions require newer version of libusb.
> > > For example, functions to get port (quite like busid) information
> > > libusb_get_port_numbers or libusb_get_port_path need
> > > libusb version >= 1.0.12. If libusb version is not satisfied, the whole pvusb
> > > work might be blocked.
> > Is this really a problem? lubusb version 1.0.12 is out for three years
> > now. Would we really need to support pvUSB on dom0 not being capable
> > to install a more recent libusb?
> Of interest would be which distro versions have >= 1.0.12 i.e. for
> common things like Debian, SuSE, SLE, Fedora etc.
openSUSE since 13.2 (13.1 has 1.0.9)
SLE since 12


Juergen

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