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

["Chun Yan Liu" <cyliu@xxxxxxxx>]

>>> 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.

- Chunyan


>  
> Ian. 
>  
>  
>  



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