Re: Xen 4.2 TODO / Release

[Roger Pau Monne <roger.pau@citrix.com>]

Ian Campbell wrote:
> Plan for a 4.2 release:
> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00793.html
>
> The time line is as follows:
>
> 19 March        -- TODO list locked down
> 2 April         -- Feature Freeze
>                                                  <<  WE ARE HERE
> Mid/Late May    -- First release candidate
> Weekly          -- RCN+1 until it is ready
>
> It seems pretty obvious at this stage that we are not going to be
> doing an RC in Mid/Late May. The big remaining items are being
> actively worked on and are quite well understood. I've also done a
> pass through the tools blockers list and have proposed moving some
> items to the Nice To Have list.
>
> The updated TODO list follows. Per the release plan a 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 4.3.
>
> 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)
>
> Other than that I think we should consider the freeze to be in full
> effect and the bar to entry to 4.2 to be very high.
>
> hypervisor, blockers:
>
>      * None
>
> 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:
>
>          * libxl_wait_for_free_memory/libxl_wait_for_memory_target.
>            Interface needs an overhaul, related to
>            locking/serialization over domain create (deferred to
>            4.3). IanJ to add note about this interface being
>            substandard but otherwise defer to 4.3. Will move to Nice To
>            Have's next week.
>
>          * libxl_*_path. Majority made internal, only configdir and
>            lockdir remain public (used by xl). (IanC, to consider
>            moving the two reamining into xl instead of libxl, will move
>            to Nice To Have's next week)
>
>          * Interfaces which may need to be async:
>
>              * libxl_domain_suspend. Move xc_domain_save/restore into a
>                separate process (IanJ, RFC posted, work ongoing).
>
>              * libxl_device_{disk,nic,vkb,add,pci}_add (and
>                remove?). Roger Pau Monné fixes disk as part of hotplug
>                script series and adds infrastructure which should make
>                the others trivial. (Roger, WIP)

Patches posted (in the hotplug series) to make disk and nic async (both 
addition and deletion). Once that is in, vfb and vkb are quite trivial. 
I'm not sure about PCI since I haven't looked at it.

You can also add:

* libxl_domain_destroy: convert to async. Mostly done since it will go 
in with my hotplug script series and the disk/nic add/remove.

>
>              * libxl_cdrom_insert. Should be easy once
>                disk_{add,remove} done. Nobody is looking at this? This
>                is basically a helper function and its functionality can
>                be implemented in terms of the libxl_disk_*
>                interfaces. We could therefore consider marking this
>                function as substandard and subject to change in the
>                future. We could also consider simply moving it into xl
>                as a helper function and revisting for 4.3.
>
>      * xl compatibility with xm:
>
>          * [BUG] cannot create an empty CD-ROM drive on HVM guest,
>            reported by Fabio Fantoni in<4F9672DD.2080902@tiscali.it>
>
>          * does not automatically try to select a (set of) node(s) on
>            which to create a VM and pin its vcpus there. (Dario
>            Faggioli, patches posted)
>
>          * `cpus=[2,3]` to select specific mapping vcpu0-->pcpu2,
>            vcpu1-->pcpu3 as xm does. (Dario Faggioli, DONE)
>
>      * [BUG] Spurious CPU params error message when starting a domain,
>        e.g. "Cpu weight out of range, valid values are within range
>        from 1 to 65535". (Ian C, patches posted, need final decision on
>        "one struct" or "multiple struct" libxl API for sched params)
>
>      * More formally deprecate xm/xend. Manpage patches already in
>        tree. Needs release noting and communication around -rc1 to
>        remind people to test xl.
>
>      * Domain 0 block attach&  general hotplug when using qdisk backend
>        (need to start qemu as necessary etc) (Stefano S, patches
>        posted, people seem happy bar the code motion)
>
>      * Improved Hotplug script support (Roger Pau Monné, patches
>        posted, nearing completion?)

I would call this "calling hotplug scripts from xl", "improved hotplug 
script support" seems quite vague. Yes, I think they are quite done, and 
people seems to be happy with that.

I also have the NetBSD support in my patch queue, waiting for the Linux 
support to go in (since it will be pointless to have to repost the 
NetBSD series every time the previous one changes).

>
>      * Block script support -- follows on from hotplug script (Roger
>        Pau Monné)

This will just be a matter of removing an "if" that's preventing libxl 
from using custom hotplug scripts for disks.

>      * Adjustments needed for qdisk backend to work on non-pvops Linux.
>        (Jan Beulich)

* qemu-upstream for NetBSD: I'm currently working on this. It compiles 
but VGA memory mapping seems to be wrong, and qemu gets a segfault when 
trying to write to it.

> hypervisor, nice to have:
>
>      * PoD performance improvements (George Dunlap)
>
>      * IRQ problem for which debugging code got added by c/s
>        24707:96987c324a4f. I have a tentative adjustment to this which
>        I would hope to at least eliminate the bad consequences of
>        crashing the hypervisor (converting the unsolicited
>        PIC-originated IRQ into a spurious one). I'll submit as soon as
>        I got to test this a little, particularly also on an old box
>        without APIC. (Jan Beulich, DONE)
>
> tools, nice to have:
>
>      * xl compatibility with xm:
>
>          * None remain
>
>      * libxl: Add API to retrieve domain console tty (Bamvor Jian
>        Zhang, patches posted)
>
>      * xl.cfg(5) documentation patch for qemu-upstream
>        videoram/videomem support:
>        http://lists.xen.org/archives/html/xen-devel/2012-05/msg00250.html
>        qemu-upstream doesn't support specifying videomem size for the
>        HVM guest cirrus/stdvga.  (but this works with
>        qemu-xen-traditional). (Pasi Kärkkäinen)
>
>
>
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