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[Xen-devel] Xen 4.6 Development Update (four months reminder)

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Hi all

We are now four months into 4.6 development window. This is an email to keep
track of all the patch series I gathered. It is by no means complete and / or
acurate. Feel free to reply this email with new projects or correct my

= Timeline =

We are planning on a 9-month release cycle, but we could also release a bit
earlier if everything goes well (no blocker, no critical bug).

* Development start: 6 Jan 2015
<=== We are here ===>
* Feature Freeze: 10 Jul 2015
* RCs: TBD
* Release Date: 9 Oct 2015 (could release earlier)

The RCs and release will of course depend on stability and bugs, and
will therefore be fairly unpredictable.

Bug-fixes, if Acked-by by maintainer, can go anytime before the First
RC. Later on we will need to figure out the risk of regression/reward
to eliminate the possiblity of a bug introducing another bug.

= Prognosis =

The states are: none -> fair -> ok -> good -> done

none - nothing yet
fair - still working on it, patches are prototypes or RFC
ok   - patches posted, acting on review
good - some last minute pieces
done - all done, might have bugs

= Bug Fixes =

Bug fixes can be checked in without a freeze exception throughout the
freeze, unless the maintainer thinks they are particularly high
risk.  In later RC's, we may even begin rejecting bug fixes if the
broken functionality is small and the risk to other functionality is

Document changes can go in anytime if the maintainer is OK with it.

These are guidelines and principles to give you an idea where we're coming
from; if you think there's a good reason why making an exception for you will
help us make Xen better than not doing so, feel free to make your case.

== Hypervisor ==

*  Alternate p2m: support multiple copies of host p2m (ok)
  -  Ed White

*  Improve RTDS scheduler (none)
   Change RTDS from quantum driven to event driven
  -  Dagaen Golomb, Meng Xu

*  Credit2: introduce per-vcpu hard and soft affinity (good)
  -  Justin T. Weaver

*  sndif: add API for para-virtual sound (fair)
   v7 posted
  -  Oleksandr Dmytryshyn

*  gnttab: improve scalability (good)
   v5 posted
  -  Christoph Egger

*  Display IO topology when PXM data is available (good)
   v7 posted
  -  Boris Ostrovsky

*  Clean-up of mem-event subsystem (good)
   v9 posted
  -  Tamas K Lengyel

*  Xen multiboot2-EFI support (fair)
   See http://lists.xen.org/archives/html/xen-devel/2013-05/msg02281.html
   RFC posted
  -  Daniel Kiper

*  Credit2 production ready (none)
   cpu reservation
  -  George Dunlap

*  VM event patches (none)
   Add support for XSETBV vm_events,
   Support hybernating guests
   Support for VMCALL-based vm_events
  -  Razvan Cojocaru

=== Hypervisor X86 ===

*  Intel GVT-g (none)
   requires refactoring ioreq-server, fixing 16-byte MMIO emulation
   and optional PV IOMMU support
  -  Yu, Zhang

*  Porting Intel P-state driver to Xen (fair)
  -  Wang, Wei

*  VT-d Posted-interrupt (PI) (good)
   v1 posted
  -  Wu, Feng

*  HT enabled with credit has 7.9 per perf drop. (none)
   kernbench demonstrated it
   This has existed since credit1 introduction.
  -  Dario Faggioli

*  Support controlling the max C-state sub-state (fair)
   v3 posted
   Hadn't see the patch reposted.
  -  Ross Lagerwall

*  IOMMU ABI for guests to map their DMA regions (fair)
  -  Malcolm Crossley

*  RMRR fix (fair)
   RFC posted
  -  Tiejun Chen

*  VPMU - 'perf' support in Xen (good)
   v21 posted
   Need reviews/final ack.
  -  Boris Ostrovsky

*  PVH domU (fair)
   RFC posted
  -  Elena Ufimtseva

=== Hypervisor ARM ===

*  Mem_access for ARM (good)
   v15 posted
  -  Tamas K Lengyel

*  ITS support (fair )
  -  Vijaya Kumar K

*  Add ACPI support for arm64 on Xen (fair)
   RFC posted
  -  Parth Dixit

*  ARM: reenable support 32-bit userspace running in 64-bit guest (good)
   v2 posted
  -  Ian Campbell

*  ARM remote processor iommu module (GPUs + IPUs) (fair)
   v3 posted
  -  Andrii Tseglytskyi

*  ARM VM save/restore/live migration (none)
   Need to rebased against migrationv2 - no code posted.
  -  None

*  ARM GICv2m support (none)
  -  Suravee Suthikulanit

*  ARM  PCI passthrough (none)
  -  Manish Jaggi
  -  Vijay Kilari

== Xen toolstack ==

*  Migration v2 (libxl) (none)
  -  Andrew Cooper

*  toolstack-based approach to pvhvm guest kexec (fair)
   also contains hypervisor side change
  -  Vitaly Kuznetsov

*  Toolstack-based approach to pvhvm guest kexec (ok)
   v4 posted
  -  Vitaly Kuznetsov

*  libxl: cancelling asynchronous operations (fair)
   RFC posted
  -  Ian Jackson

*  VMware tools support (fair)
  -  Don Slutz

*  PV USB support in libxl (fair)
  -  Chunyan Liu

*  HVM USB support in libxl (fair)
   depend on PV USB support
  -  George Dunlap

*  Blktap2 support (fair)
  -  George Dunlap

*  pvscsi in libxl (fair)
  -  Juergen Gross and Olaf

*  COarse-grain LOck-stepping Virtual Machines in Xen (fair)
   RFC v5 posted
  -  Wen Congyang
  -  Gui Jianfeng
  -  Yang Hongyang
  -  Dong, Eddie

*  tmem migrationv2 patches. (none)
  -  Bob Liu & Andrew Cooper & David Vrabel

*  Remus using migration-v2 (fair)
   RFC posted - depends on v6 of 'New Migration'
  -  Yang Hongyang

*  snapshot API extension (checkpointing disk) (fair)
  -  Chunyan Liu

*  PVH - Migration of PVH DomUs. (none)
   Depends on migration2 code
   v1 posted
  -  Roger Pau Monné

*  PVH - Migration of guests from a PVH dom0  (fair)
   Depends on migration2 code
  -  Roger Pau Monné

== QEMU ==

*  Linux-based QEMU upstream stub domain (fair)
   RFC posted
  -  Eric Shelton

*  Using qemu-upstream in a stubdomain (none)
   Will use rump kernels.
  -  Wei Liu

*  Intel IGD PCI GPU passthrough (ok)
   v5 posted
  -  Chen, Tiejun

== Linux ==

*  Linux ARM - Device assigment (PCI) (none)
   Depends on Xen pieces which are on the Xen 4.6 list.
  -  Manish Jaggi

*  VPMU - 'perf' support in Linux (ok)
   Depends on Xen patches
   Acked by David Vrabel
  -  Boris Ostrovsky

*  vNUMA in Linux (ok)
   v6 posted
  -  Wei Liu

*  COLO Agent in Linux (fair)
  -  Gui Jianfeng
  -  Yang Hongyang
  -  Dong, Eddie

*  ARM64 - support 64K guest (none)
  -  Julien Grall

== OpenStack ==

*  setup CI loop for OpenStack (fair)
  -  Anthony Perard

== FreeBSD ==

*  PVH FreeBSD dom0 (ok)
   FreeBSD 11 goal. Toolstack side done in Xen 4.5
  -  Roger Pau Monné

== Other OSes (MiniOS, QNX) ==

*  ARM - MiniOS (fair)
   v7 posted
  -  Thomas Leonard

*  PV drivers for automotive kernels (fair)
  -  Artem Mygaiev

*  mini-os: xenbus changes for rump kernels (ok)
   branch: base.dev-xen-xenbus.v1..dev-xen-xenbus.v1
   v2 posted
  -  Ian Jackson


*  OSSTest: studom test case (none)
  -  Wei Liu

*  OSSTest: libvirt migration (fair)
  -  Wei Liu

*  OSSTest: upgrade to Debian Jessie (none)
  -  Wei Liu

*  OSSTest: performance test (fair)
  -  Dario Faggioli

*  CPU pool test case (fair)
  -  Dario Faggioli

*  Add a FreeBSD host (fair)
  -  Roger Pau Monné

*  Nested virt test case

*  v8 posted (fair)
  -  Robert Hu

== Deferred ==

*  ucode=scan also scan compressed initramfs (none)
  -  Konrad Rzeszutek Wilk

*  adjust log buffer based on memmap size (none)
  -  Konrad Rzeszutek Wilk

*  Further tmem cleanups/fixes (fair)
  -  Bob Liu

*  1TB slow destruction (ok)
  -  Bob Liu

*  cpuid leveling (none)
  -  Andrew Cooper

*  IO-NUMA - hwloc and xl (none)
   Andrew Cooper had an RFC patch for hwloc
   add restrictions  as to which devices cannot safely/functionally be split 
  -  Boris Ostrovsky

*  Convert tasklet to per-cpu tasklets (fair)
   RFC posted
  -  Konrad Rzeszutek Wilk

*  Xen Boot Information (xbi) (ok)
   Dependency for GRUB2 + EFI work
   v4, No go for full patchset. Only some of the patches.
   No ARM EFI hardware (yet) available to test them.
  -  Daniel Kiper

*  Linux ARM - Device assigment usage in Linux code (arch/arm) non-PCI (none)
   Depends on Xen pieces which are on the Xen 4.6 list.
  -  Julien Grall

== Completed ==

*  New Migration (v2). (good)
   v9 (libxc)
   Seems that it might need to slip or we run v1 alongside v2.
  -  Andrew Cooper & David Vrabel

*  libxl: add qxl vga interface support for upstream qemu (fair)
  -  Fabio Fantoni

*  ARM - passthrough of non-PCI (ok)
  -  Julien Grall

*  Intel Cache Allocation Technology (good)
  -  Chao Peng

*  Intel PML (Page Modification Logging) for Xen (good)
   v1 posted
  -  Kai Huang

*  Regression in PCI passthrough of INTx legacy devices can trigger list 
corruption (good)
   Sander reported it. Two different types of patches available.
  -  Konrad Rzeszutek Wilk

*  HVM guest NUMA (SRAT) (good)
   See vNUMA in Xen toolstack
  -  Wei Liu

*  vNUMA in Xen toolstack (good)
   v8 posted
  -  Wei Liu

*  Intel memory bandwidth monitoring for VMs (fair)
   v9 posted
  -  Chao Peng

*  ARM - SMMU resync of Linux's one (ok)
  -  Julien Grall

*  Add support for Xilinx ZynqMP SoC (fair)
  -  Edgar E. Iglesias

*  Add support for Huawei hip04-d01 platform (ok)
  -  Frediano Ziglio

*  Thunder X platform support (ok)
  -  Vijay Kilari

*  Splitting off mini-os (done)
  -  Wei Liu

*  OVMF on ARM (done)
   v4 posted
  -  Ard Biesheuvel

*  Update Xen tree to use upstream OVMF (done)
  -  Anthony PERARD

*  Enable vTPM subsystem on TPM 2.0 (done)
  -  Xu, Quan

*  SPICE support improvement (done)
  -  Fabio Fantoni

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