Re: [Xen-devel] Xen 4.4 development update

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Ian Campbell wrote on 2014-01-08:
> I'm filing in for George while he is on vacation and travelling to a 
> conference etc.
> I'm still coming up to speed wrt what is going on with this release so
> please do correct me when I'm wrong. George will be back on 20 January.
> 
> This information will be mirrored on the Xen 4.4 Roadmap wiki page:
>  http://wiki.xen.org/wiki/Xen_Roadmap/4.4
> We tagged 4.4.0-rc1 on 19 December. Based on the conversation had last
> time and on George's final comments in [1] I think this means that PVH
> dom0 support has not made the cut for 4.4, which is a shame but there
> is plenty of good functionality (including PVH domU support) in there.
> 
> [1]
> http://bugs.xenproject.org/xen/mid/%3C52B05C0A.4040404@xxxxxxxxxxxxx%3 E
> 
> = Timeline =
> 
> Here is our current timeline based on a 6-month release:
> 
> * Feature freeze: 18 October 2013
> * Code freezing point: 18 November 2013
> * First RCs: 6 December 2013  <== WE ARE HERE
> * Release: 21 January 2014
> 
> Last updated: 8 January 2014
> 
> == Completed ==
> 
> * Event channel scalability (FIFO event channels)
> 
> * Non-udev scripts for driver domains (non-Linux driver domains)
> 
> * Multi-vector PCI MSI (Hypervisor side)
> 
> * Improved Spice support on libxl
>  - Added Spice vdagent support
>  - Added Spice clipboard sharing support
>  - Spice usbredirection support for upstream qemu
> * PHV domU (experimental only)
> 
> * pvgrub2 checked into grub upstream
> 
> * ARM64 guest
> 
> * Guest EFI booting (tianocore)
> 
> * kexec
> 
> * Testing: Xen on ARM
> 
> * Update to SeaBIOS 1.7.3.1
> 
> * Update to qemu 1.6
> 
> * SWIOTLB (in Linux 3.13)
> 
> * Disk: indirect descriptors (in 3.11)
> 
> * Reworked ocaml bindings

Can I say nested virtualization also is good supported in Xen 4.4?

> 
> == Resolved since last update ==
> 
> == Open ==
> 
> * xl support for vnc and vnclisten options with PV guests  >
> http://bugs.xenproject.org/xen/bug/25
>  status: V4 patch posted. Should go in.
>  Blocker?
> * libxl / xl does not handle failure of remote qemu gracefully
>> Related to http://bugs.xenproject.org/xen/bug/29
>> Easiest way to reproduce:
>>  - set "vncunused=0" and do a local migrate
>>  - The "remote" qemu will fail because the vnc port is in use
>> The failure isn't the problem, but everything being stuck
> afterwards is  Ian J investigating
> 
> * xl needs to disallow PoD with PCI passthrough
>> see
> http://xen.1045712.n5.nabble.com/PATCH-VT-d-Dis-allow-PCI-device-assig
> nme nt-if-PoD-is-enabled-td2547788.html
> 
> * qemu-upstream not freeing pirq
>> http://www.gossamer-threads.com/lists/xen/devel/281498
>> http://marc.info/?l=xen-devel&m=137265766424502
>> status: patches posted; latest patches need testing  Not a blocker.
> * Race in PV shutdown between tool detection and shutdown watch  >
> http://www.gossamer-threads.com/lists/xen/devel/282467
>> Nothing to do with ACPI
>> status: Patches posted
>> Not a blocker.
> * xl does not support specifying virtual function for passthrough
> device  >
> http://bugs.xenproject.org/xen/bug/22
>  Too much work to be a blocker.
> * xl does not handle migrate interruption gracefully
>> If you start a localhost migrate, and press "Ctrl-C" in the middle,
>> you get two hung domains
>> Ian J investigated -- can of worms, too big to be a blocker for 4.4
> * Win2k3 SP2 RTC infinite loops
>> Regression introduced late in Xen-4.3 development
>    owner: andrew.cooper@citrix
>    status: patches posted, undergoing review. ( v2 ID
> 1386241748-9617-1-git-send-email-andrew.cooper3@xxxxxxxxxx )
> 
>> andyhhp: my proposed RTC fixes break migrate from older versions of
>> Xen, so I have to redesign it from scratch. no way it is going to
>> be ready for 4.4
> 
> * HPET interrupt stack overflow (when using hpet_broadcast mode and
> MSI capable HPETs)
>   owner: andyh@citrix
>   status: patches posted, undergoing review iteration.
>> andyhhp: I have more work to do on the HPET series
>> andyhhp: no way it is going to be ready or safe for 4.4
> 
> * PCI hole resize support hvmloader/qemu-traditional/qemu-upstream
> with PCI/GPU passthrough
>> http://bugs.xenproject.org/xen/bug/28
>> http://lists.xen.org/archives/html/xen-devel/2013-05/msg02813.html
>> Where Stefano writes:
>> 2) for Xen 4.4 rework the two patches above and improve
>> i440fx_update_pci_mem_hole: resizing the pci_hole subregion is not
>> enough, it also needs to be able to resize the system memory region
>> (xen.ram) to make room for the bigger pci_hole
> 
>   status: not going to be fixed for 4.4 either. Created bug #28.
> * qemu memory leak?
>> http://lists.xen.org/archives/html/xen-users/2013-03/msg00276.html
> 
> * qemu-* parses "008" as octal in USB bus.addr format
>> http://bugs.xenproject.org/xen/bug/15
>> just needs documenting
>   Anthony Perard to patch docs
> * osstest windows-install failures
>> http://bugs.xenproject.org/xen/bug/29
>> http://www.chiark.greenend.org.uk/~xensrcts/logs/24250/
>   Anthony and/or Jan investigating
> === Big ticket items ===
> 
> * PVH dom0 (w/ Linux)
>   blocker
>   owner: mukesh@oracle, george@citrix
>   status (Linux): Acked, waiting for ABI to be nailed down
>   status (Xen): v6 posted; no longer considered a blocker
> * libvirt/libxl integration (external)
>  - owner: jfehlig@suse, dario@citrix
>  - patches posted (should be released before 4.4)
>   - migration - PCI pass-through - In progress - integration w/
>   libvirt's lock manager - improved concurrency
> 
> 
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> http://lists.xen.org/xen-devel


Best regards,
Yang



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