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[Xen-devel] Xen 4.2 TODO

  • To: xen-devel <xen-devel@xxxxxxxxxxxxx>
  • From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
  • Date: Mon, 23 Jul 2012 11:44:35 +0100
  • Delivery-date: Mon, 23 Jul 2012 10:44:57 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

Plan for a 4.2 release:

The time line is as follows:

19 March        -- TODO list locked down
2 April         -- Feature Freeze
                                                << WE ARE HERE
When It's Ready -- First release candidate
Weekly          -- RCN+1 until release

The updated TODO list follows.

If you are aware of any bugs which must/should be fixed for 4.2 then
please reply to this thread (otherwise I may not remember to pick them
up next week)

A very strong case will now have to be made as to why new items should
be added to the list, especially as a blocker, rather than deferred to

hypervisor, blockers:

    * [BUG] stub domains broken. HVM_PARAM_DM_DOMAIN needs to reset

    * [BUG] EFI binaries installed to /efi instead of under /usr/lib
      after LIB_DIR definition moved to configure script. (Matt
      Wilson, patch posted, under discussion)

tools, blockers:

    * libxl stable API -- we would like 4.2 to define a stable API
      which downstream's can start to rely on not changing. Aspects of
      this are:

        * Interfaces which may need to be async:

            * libxl_device_{disk,nic,vkb,add,pci}_add (and
              remove). (Roger Pau MonnÃ, all except pci included in
              calling hotplug scripts from xl)

        * LIBXL_NIC_TYPE enum names are confusing. (Roger, included in
          calling hotplug scripts series)

    * xl compatibility with xm:

        * [BUG] cannot create an empty CD-ROM drive on HVM guest,
          reported by Fabio Fantoni in <4F9672DD.2080902@xxxxxxxxxx>
          (Ian C, has a half baked patch) 

        * does not automatically try to select a (set of) node(s) on
          which to create a VM and pin its vcpus there. (Dario
          Faggioli, first half applied, second half reposted)

    * [CHECK] More formally deprecate xm/xend. Manpage patches already
      in tree. Needs release noting and communication around -rc1 to
      remind people to test xl.

    * calling hotplug scripts from xl (Linux and NetBSD) (Roger Pau
      MonnÃ, v9 posted, review on going)

    * Block script support -- follows on from hotplug script (Roger
      Pau MonnÃ, "just be a matter of removing an "if"")

    * [CHECK] Confirm that migration from Xen 4.1 -> 4.2 works.

    * [BUG] LIBLEAFDIR et al and libfsimage do the wrong thing on
      modern Debian/Ubuntu w/ multiarch capabilities (Matt Wilson,

    * libxl to reject attempts to migrate a domain using upstream
      qemu, due to lack of log dirty support (Ian C, patch sent,
      awaiting review)

    * [BUG] parameter 'maxvcpus' causes hvm guest boots up with wrong
      vcpu number http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1825

hypervisor, nice to have:

    * vMCE save/restore changes, to simplify migration 4.2->4.3 with
     new vMCE in 4.3. (Jinsong Liu, Jan Beulich)

tools, nice to have:

    * xl compatibility with xm:

        * Accept "xl cr /dev/null param=value" to provide all config
          on the command line (W. Michael Petullo, DONE)

    * libxl stable API

        * libxl_wait_for_free_memory/libxl_wait_for_memory_target.
          Interface needs an overhaul, related to
          locking/serialization over domain create. IanJ to add note
          about this interface being substandard but otherwise defer
          to 4.3.

        * Interfaces which may need to be async:

            * libxl_cdrom_insert. Should be easy once
              disk_{add,remove} done. This is basically a helper
              function and its functionality can be implemented in
              terms of the libxl_disk_* interfaces. If this is not
              done in time we should document as a substandard
              interface which is subject to change post 4.2.

              (IanC: this function just looks to be broken to me... I
              have a half baked fixup patch)

    * xl.cfg(5) documentation patch for qemu-upstream
      videoram/videomem support:
      qemu-upstream doesn't support specifying videomem size for the
      HVM guest cirrus/stdvga.  (but this works with
      qemu-xen-traditional). (Pasi KÃrkkÃinen)

    * [BUG] long stop during the guest boot process with qcow image,
      reported by Intel: http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1821

    * [BUG] vcpu-set doesn't take effect on guest, reported by Intel:

    * Load blktap driver from xencommons initscript if available, thread at:
      <db614e92faf743e20b3f.1337096977@kodo2>. To be fixed more
      properly in 4.3. (Patch posted, discussion, plan to take simple
      xencommons patch for 4.2 and revist for 4.3)

    * [BUG] xl allows same PCI device to be assigned to multiple
      guests. http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1826

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