From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: [GIT PULL] remove xend for 4.5 (Was: Re: [PATCH] MAINTAINERS: Exclude xend from toolstack maintainers entry) Date: Mon, 31 Mar 2014 11:06:52 -0400 Message-ID: <20140331150652.GG3159@phenom.dumpdata.com> References: <1395321629-24392-1-git-send-email-ian.campbell@citrix.com> <532AFBFC0200007800126275@nat28.tlf.novell.com> <1395324138.16974.61.camel@kazak.uk.xensource.com> <1395918009.22909.50.camel@kazak.uk.xensource.com> <20140328170919.GC12659@phenom.dumpdata.com> <533969FB.9010606@eu.citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <533969FB.9010606@eu.citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: George Dunlap Cc: Ian Campbell , Stefano Stabellini , Ian Jackson , "xen-devel@lists.xen.org" , Jan Beulich , Matt Wilson List-Id: xen-devel@lists.xenproject.org On Mon, Mar 31, 2014 at 02:13:31PM +0100, George Dunlap wrote: > On 03/28/2014 05:09 PM, 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 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, 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'm copying this into my roadmap list (to hand on to the next > release coordinator, whoever he or she may be). Are there any > references you can give for this? It kind of started with this thread: http://lists.xen.org/archives/html/xen-devel/2014-03/msg01053.html And then Jan clued me in (http://lists.xen.org/archives/html/xen-devel/2014-03/msg01101.html) and that we could use this group assigment as a way to fix this problem. That is since each PCI bridge and its devices underneath would have a group id - you just assign it that group and the VT-d/AMD-VI would go through and setup contexts for all possible BDFs underneath. > > -George