Re: [Xen-devel] [GIT PULL] remove xend for 4.5 (Was: Re: [PATCH] MAINTAINERS: Exclude xend from toolstack maintainers entry)

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-03-28 at 13:09 -0400, Konrad Rzeszutek Wilk wrote:
> On Thu, Mar 27, 2014 at 11:08:47AM +0000, George Dunlap wrote:
> > On Thu, Mar 27, 2014 at 11:00 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> > wrote:
> > > On Thu, 2014-03-20 at 14:02 +0000, Ian Campbell wrote:
> > >> On Thu, 2014-03-20 at 13:32 +0000, Jan Beulich wrote:
> > >> >  Which reminds me - didn't you want to rip out xend
> > >> > right away after 4.4 (which would render pointless the patch
> > >> > here)?
> > >>
> > >> I still want to do it before 4.5, this is more of a short term thing
> > >> because people were sending me patches right now.
> > >>
> > >> Step one of the removal is to stop osstest from testing xend, I sent a
> > >> patch for that a week or two ago.
> > >
> > > That patch is now in place in the production osstest. So I propose the
> > > following pull request (since the actual patch is nearly 3M in size,
> > > even the diffstat here is bigger than most patches!).
> > 
> > On my list of dependencies for removing xend, I have the following:
> > 
> > * xend still in tree (x)
> >  - xl list -l on a dom0-only system
> >  - xl list -l doesn't contain tty console port
> >  - xl Alternate transport support for migration*
> >  - xl PVSCSI support
> >  - xl PVUSB support
> >  - xl support for vnc and vnclisten options with PV guests
> 
> I don't really like adding more of 'xend has this' to the list,

that's ok.

> but
> Jan discovered that 'xend' was using the group assigment hypercall for
> PCI devices while 'xl' is not doing that. 
>  
> That hypercall has certain benefits - you can use it to figure out if 
> all of the PCI devices underneath a bridge are assigned to one
> guest and not shared amongts the guests.

I think this is at the wishlist rather than blocker end of the spectrum,
and probably falls under the general category of "xl pci passthrough has
sharp edges"? Does that sound right?

Ian.


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