Re: [Xen-devel] [PATCH 2/2] systemd: drop dependency on proc-xen.mount in xendriverdomain.service

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 25, 2016 at 10:45:54AM +0100, Andrew Cooper wrote:
> On 25/07/16 10:34, Wei Liu wrote:
> > On Mon, Jul 25, 2016 at 11:30:32AM +0200, Marek Marczykowski-Górecki wrote:
> >> On Mon, Jul 25, 2016 at 10:27:47AM +0100, Wei Liu wrote:
> >>> On Sun, Jul 24, 2016 at 09:27:13PM +0200, Marek Marczykowski-Górecki 
> >>> wrote:
> >>>> It is no longer required since xl devd use /dev/xen interface.
> >>>>
> >>> How would this unit work when there is no /dev/xen interface?
> >> Does it happen in reality? I thought /proc/xen is deprecated for a long
> >> time...
> 
> It really should be, but isn't.
> 
> /proc/xen/capabilities and /proc/xen/allsyms (?) don't have any
> equivalent in /dev/
> 
> >>
> > I can't tell whether it happens in reality or not. I also hope to get
> > rid of deprecated interface but they are here to stay for as long as it
> > takes.
> >
> > I guess the question is, do you have a compelling reason against keeping
> > this dependency?
> 
> We really should be making xenfs deprecated and able to be compiled out
> of Linux.  It is a hangover of the early classic kernels which isn't
> necessary, and causes subtle/weird failures if it isn't mounted.
> 

+1 from me of course!

When the kernel is ready, I shall remove the fallback in libraries and
then we can remove all references to proc-xen.mount and even
proc-xen.mount itself.

Wei.

> ~Andrew

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