Re: [Xen-devel] Xen 4.5 Development Update (RC4) - Documentation Updates

[Lars Kurth <lars.kurth.xen@xxxxxxxxx>]

Hi all,

in preparation for the release we need to update some wiki pages, as well as 
in-tree docs

First of all, any new features for which any of you have written new wiki pages 
should be marked with [[Category:Xen 4.5]]. Either do this, or reply with URLs 
to pages and I will do so 

Otherwise, I created boilerplate pages for various pages and tracked the status 
on http://wiki.xenproject.org/wiki/Category:Xen_4.5

@Russell: you may want to update the XM to XL pages or create a new one and add 
your video

== The following pages need to be reviewed and updated ==
* {{NotDone}} [[Linux PVH]]: 
** Add PVH Dom0 information 
** Review/correct the '''Things that are broken''' section
** Review/correct the '''Items that have not been tested extensively or at 
all'''

* {{NotDone}} [[Xen ARM with Virtualization Extensions]] 
** supported platforms need to be updated and 
** all platforms that are supported in 4.5 tagged appropriately with 
[[Category:Xen 4.5]]

== Lars will fix ==
* {{NotDone}} [[Xen Project 4.5 Acknowledgements]] 
** Lars will do this.  

* {{NotDone}} [[Xen Project 4.5 Feature List]] 
** Lars will copy from the blog announcement when ready (Sarah is currently 
making some final changes)

== For Konrad and others ==
* {{NotDone}} [[Xen Project Release Features]] - main 4.5 features need to be 
added. 

Please reply to the thread and I will add that page.
** The key changes normally are changes to scalability/memory/etc. limits - 
maybe Jan(x86) and Ian(ARM) can look let me know of changes
** Also new platforms, changes to experimental features, etc. 
** Probably the new scheduler should be added - is there a wiki page?
** Any other major new features that are worth highlighting? I can go through 
the press release and the release note

* {{NotDone}} [[Xen Project 4.5 Release Notes]] - needs to be created 
** http://wiki.xenproject.org/wiki/Xen_Project_4.4_Release_Notes were pretty 
lightweight 
** I think we should keep it that way. We should probably mainly focus on known 
issues
@Konrad: what's your view?

== Missing pages ==
* {{NotDone}} [[Xen Project 4.5 Man Pages]] 
** need to clone [[Xen Project 4.4 Man Pages]] and point to the correct branch 
when the 4.5 branch has been created
** if there are new documented features in in-tree docs then add them
** if there are irrelevant features such as XM, remove links to docs (probably 
the docs should be removed from the git tree also)

Cheers
Lars

On 16 Dec 2014, at 16:13, konrad.wilk@xxxxxxxxxx wrote:

> Xen 4.5-rc4 was out on Monday (Dec 15th). This is the last RC and then
> we have the General Release on Jan 7th!
> 
> Details for the test-day are at
> 
> http://wiki.xen.org/wiki/Xen_4.5_RC4_test_instructions
> 
> In terms of bugs, we have:
> 
> #11 qxl hypervisor support
> #13 Re: [Xen-devel] man page example: xm block-attach
> #18 xl improve support for migration over non-sshlike tunnels
> #19 xl migrate transport improvements
> #22 xl does not support specifying virtual function for passthrough device
> #23 Remove arbitrary LIBXL_MAXMEM_CONSTANT from libxl, see what breaks
> #24 xl missing support for encrypted VNC
> #27 Re: [Xen-devel] xend vs xl with pci=['<bdf'] wherein the '<bdf>' are not 
> owned by pciback or pcistub will still launch.
> #28 support PCI hole resize in qemu-xen
> 
> [ 'mmio_hole' fix it, but the ultimate way is to fix it in QEMU]
> 
> #30 libxl should implement non-suspend-cancel based resume path
> #36 credit2 only uses one runqueue instead of one runq per socket
> #38 Implement VT-d large pages so we can avoid sharing between EPT
> #40 linux pvops: fpu corruption due to incorrect assumptions
> #42 "linux, S3 resume of PVHVM fails - missing call to xen_arch_post_suspend?"
> #43 "30s delay loading xenfb driver on some systems"
> #44 Security policy ambiguities - XSA-108 process post-mortem
> #45 arm: domain 0 disables clocks which are in fact being used
> #46 qemu-upstream: limitation on 4 emulated NICs prevents guest from starting 
> unless PV override is used.
> 
> = Timeline =
> 
> We wer planning on a 9-month release cycle - but it is more like an
> 10 month.  Based on that, below are the estimated dates:
> 
> 
> * Feature Freeze: 24th September 2014
> * First RC: 24th October [Friday!]
> * RC2: Nov 11th
> * RC2 Test-day: Nov 13th
> * RC3: Dec 3rd.
> * RC3 Test-day: Dec 4th
> * RC4: Dec 15th
> 
> <==== WE ARE HERE ===>
> 
> * RC4 Test-day: Dec 17th
> 
> Release Date: Jan 7th.
> 
> 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
> code 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
> high.
> 
> 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 achieve goals 1-3 above better than not
> doing so, feel free to make your case.
> 
> = Open =
> 
> == Known issues ==
> 
> == Linux ==
> 
> *  Linux block multiqueue (ok)
>   v2 posted.
>  -  Arianna Avanzini
> 
> *  VPMU - 'perf' support in Linux (ok)
>   Depends on Xen patches
>   Acked by David Vrabel
>  -  Boris Ostrovsky
> 
> *  vNUMA in Linux (ok)
>   v6 posted
>   git://gitorious.org/vnuma/linux_vnuma.git
>  -  Elena Ufimtseva
> 
> *  vsyscall in Linux (fair)
>  -  Konrad Rzeszutek Wilk
> 
> *  COLO Agent in Linux (fair)
>  -  Gui Jianfeng
>  -  Yang Hongyang
>  -  Dong, Eddie
> 
> == FreeBSD ==
> 
> *  PVH FreeBSD dom0 (ok)
>   FreeBSD 11 goal. Toolstack side done in Xen 4.5
>  -  Roger Pau Monné
> 
> == Other OSes (MiniOS, QNX) ==
> 
> *  PV drivers for automotive kernels (fair)
>  -  Artem Mygaiev
> 
> *  mini-os: xenbus changes for rump kernels (ok)
>   git://xenbits.xen.org/people/iwj/rumpuser-xen.git
>   branch: base.dev-xen-xenbus.v1..dev-xen-xenbus.v1
>   v2 posted
>  -  Ian Jackson
> 
> == GRUB2 ==
> 
> *  GRUB2 multiboot2 (fair)
>  -  Daniel Kiper
> 
> == OSSTEST ==
> 
> *  OSSTest: libvirt (good)
>  -  Ian Campbell
> 
> == Deferred to QEMU v2.next ==
> 
> *  Using qemu-upstream in a stubdomain (fair)
>   Will use rump kernels.
>  -  Ian Jackson
> 
> *  AMD Radeon PCI GPU passthrough (none)
>   Focusing on Xen 4.2 and qemu-traditional
>  -  Kelly Zytaruk
> 
> *  Intel IGD PCI GPU passthrough (ok)
>   v5 posted
>  -  Chen, Tiejun
> 
> *  Update Xen tree to use upstream OVMF (fair)
>  -  Anthony PERARD
> 
> == Deferred to Xen hypervisor 4.6 ==
> 
> *  xc_reserved_device_memory_map in hvmloader to avoid conflicting MMIO/RAM 
> (good)
>   v7 posted.
>   Treating pieces as bug-fixes only.
>   Low likehood of making it in Xen 4.5. Deferred
>  -  Tiejun Chen
> 
> *  VPMU - 'perf' support in Xen (good)
>   v14 posted
>   Need reviews/final ack.
>  -  Boris Ostrovsky
> 
> *  Xen Boot Information (xbi) (ok)
>   Dependency for GRUB2 + EFI work
>   http://lists.xen.org/archives/html/xen-devel/2014-10/msg02068.html
>   v4, No go for full patchset. Only some of the patches.
>   No ARM EFI hardware (yet) available to test them.
>  -  Daniel Kiper
> 
> *  PVH - AMD hardware support. (fair)
>   Posted.
>  -  Mukesh Rathor
> 
> *  VMware backdoor (hypercall) (ok)
>   v5 posted.
>  -  Don Slutz
> 
> *  extending mem_access support to PV domain (fair)
>   RFC v2
>  -  Aravindh Puthiyaparambil (aravindp)
> 
> *  Repurpose SEDF Scheduler for Real-time (fair)
>   RFC patch posted (v2)
>  -  Joshua Whitehead, Robert VanVossen
> 
> *  ARM remote processor iommu module (GPUs + IPUs) (fair)
>   v3 posted
>  -  Andrii Tseglytskyi
> 
> *  dirty vram / IOMMU bug (fair)
>   http://bugs.xenproject.org/xen/bug/38
>  -  Zhang, Yang Z
> 
> *  Xen multiboot2-EFI support (fair)
>   Needed for GrUB2
>   Depends on Xen Boot info (rework multiboot and other structs)
>   See http://lists.xen.org/archives/html/xen-devel/2013-05/msg02281.html
>   RFC posted
>  -  Daniel Kiper
> 
> *  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
> 
> *  Default to credit2 (none)
>   cpu pinning, numa affinity and cpu reservation
>  -  George Dunlap
> 
> *  Convert tasklet to per-cpu tasklets (fair)
>   RFC posted
>  -  Konrad Rzeszutek Wilk
> 
> *  Further tmem cleanups/fixes (16TB etc) (fair)
>  -  Bob Liu
> 
> *  1TB slow destruction (ok)
>  -  Bob Liu
> 
> *  ARM VM save/restore/live migration (none)
>   Need to rebased against migrationv2 - no code posted.
>  -  Junghyun Yoo
> 
> *  ARM GICv2m support (none)
>  -  Linaro (unknown)
> 
> *  ARM - SMMU resync of Linux's one (none)
>  -  Julien Grall
> 
> *  ARM - passthrough of non-PCI (none)
>  -  Julien Grall
> 
> *  ARM64 (Cavium Thunder)  PCI passthrough (fair)
>  -  Manish Jaggi
> 
> *  ARM - Remove XEN_DOMCTL_arm_configure_domain band-aid and make it part of 
> create_domain. (none)
>  -  Julien Grall
> 
> *  HT enabled with credit has 7.9 per perf drop. (none)
>   kernbench demonstrated it
>   http://www.gossamer-threads.com/lists/xen/devel/339409
>   This has existed since credit1 introduction.
>  -  Dario Faggioli
> 
> == Deferred to Xen toolstack 4.6 ==
> 
> *  pvUSB support in libxl (none)
>  -  Simon Cao
> 
> *  vNUMA in Xen toolstack (ok)
>   v11 posted
>   Hypervisor part in
>   git://gitorious.org/vnuma/xen_vnuma.git:v11
>  -  Elena Ufimtseva
> 
> *  pvscsi in libxl (fair)
>  -  Juergen Gross and Olaf
> 
> *  COarse-grain LOck-stepping Virtual Machines in Xen (fair)
>   RFC v3 posted, based on remus-v19
>  -  Wen Congyang
>  -  Gui Jianfeng
>  -  Yang Hongyang
>  -  Dong, Eddie
> 
> *  extend the xenstore ring with a 'closing' signal (fair)
>   RFC patch posted
>  -  David Scott
> 
> *  New Migration (v2). (good)
>   v7 (libxc and libxl)
>   git://xenbits.xen.org/people/andrewcoop/xen.git
>   Seems that it might need to slip or we run v1 alongside v2.
>  -  Andrew Cooper & David Vrabel
> 
> *  libxl migrationv2 patches. (none)
>  -  Andrew Cooper & David Vrabel
> 
> *  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) (ok)
>   v5
>   His email bounces.
>  -  Bamvor Jian Zhang
> 
> *  Rearrange and cleanup installation destination directories (/var -> 
> var/lib/xen) (fair)
>  -  Daniel Kiper
> 
> *  libxl/xl - xm compatibility mode for mem-max and mem-set; (ok)
>  -  Daniel Kiper
> 
> *  xl list --long (and some related xl commands) have some bugs (none)
>  -  Zhigang Wang
> 
> *  Xen HPET interrupt fixes (fair)
>   behind migration v2
>  -  Andrew Cooper
> 
> *  cpuid leveling (none)
>   
> http://xenbits.xen.org/people/andrewcoop/feature-levelling/feature-levelling-D.pdf
>  -  Andrew Cooper
> 
> *  live migration knobs, there is no suitable code yet, just ideas (none)
>    http://lists.xenproject.org/archives/html/xen-devel/2014-03/msg00785.html
>  -  Olaf Hering
> 
> *  xl does not handle migrate interruption gracefully (none)
>   If you start a localhost migrate, and press "Ctrl-C" in the middle, you get 
> two hung domains
>  -  Ian Jackson
> 
> *  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 
> apart.
>  -  Boris Ostrovsky
> 
> *  HVM guest NUMA (SRAT) (fair)
>   RFC posted.
>  -  Wei Liu
> 
> *  PVH - Migration of PVH DomUs. (none)
>   Depends on migration2 code
>  -  Roger Pau Monné
> 
> *  PVH - Migration of guests from a PVH dom0  (none)
>   Depends on migration2 code
>  -  Roger Pau Monné
> 
> *  ucode=scan also scan compressed initramfs (none)
>  -  Konrad Rzeszutek Wilk
> 
> *  adjust log buffer based on memmap size (none)
>  -  Konrad Rzeszutek Wilk
> 
> == Deferred to Linux's after Xen 4.6 ==
> 
> *  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
> 
> *  Linux ARM - Device assigment (PCI) (none)
>   Depends on Xen pieces which are on the Xen 4.6 list.
>  -  Manish Jaggi
> 
> *  pvUSB in Linux (fronted and backend) (Fair)
>  -  Juergen Gross
> 
> == Up for grabs ==
> 
> *  OSSTest - also test Linux PVH guests
> 
> *  PoD fixes
>   if you boot with memory <= maxmem we have a size estimation bug
> 
> *  TLB flushing without locks in Xen
> 
> *  xl does not support specifying virtual function for passthrough device
>   http://bugs.xenproject.org/xen/bug/22
> 
> *  PCI hole resize support hvmloader/qemu-traditional/qemu-upstream with 
> PCI/GPU passthrough
>   http://bugs.xenproject.org/xen/bug/28
> 
> *  libx{c,l} error handling cleanup
> 
> *  Adding missing 'xend' features in libxl
> 
> *  xl list -l on a dom0-only system
> 
> *  xl list -l doesn't contain tty console port
> 
> *  xl: passing more defaults in configuration in xl.conf
>   There are a number of options for which it might be useful to pass a 
> default in xl.conf.  For example, if we could have a default "backend" 
> parameter for vifs, then it would be easy to switch back and forth between a 
> backend in a driver domain and a backend in dom0.
> 
> *  PVH - PVH working with shadow.
>   Based on Tim's work
> 
> *  PVH - PCI passthrough for DomU.
> 
> *  AMD performance regressions
> 
> *  Performance due to hypercall preemption. More preemptions - slower. (none)
> 
> == Completed ==
> 
> == Hypervisor ==
> 
> *  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
> 
> *  ARM - introduce GNTTABOP_cache_flush (ok)
>   v11
>  -  Stefano Stabellini
> 
> *  ARM - VGIC emulation (done)
>   Reposted as gic and vgic fixes and improvements
>   v12
>  -  Stefano Stabellini
> 
> *  ARM implement mem_access (done)
>   v12, two patches for Xen 4.6
>   https://github.com/tklengyel/xen/tree arm_memaccess_12-for-4.5
>  -  Tamas K Lengyel
> 
> *  ARM - Add Odroid-XU (Exynos5410) support (done)
>   v6
>  -  Suriyan Ramasami
> 
> *  ARM GICv3 support (done)
>   v11 posted
>  -  Vijay Kilari
> 
> *  ARM implement mem_access (done)
>   v12, two patches for Xen 4.6
>   https://github.com/tklengyel/xen/tree arm_memaccess_12-for-4.5
>  -  Tamas K Lengyel
> 
> *  ARM - MiniOS (done)
>   v7 posted
>  -  Thomas Leonard
> 
> *  ARM XEN_DOMCTL_memory_mapping hypercall for ARM (done)
>   v12 posted.
>  -  Arianna Avanzini
> 
> *  ARM - XENFEAT_grant_map_11 (aka map grants refs at pfn = mfn) (done)
>   Provide kernels an grant->MFN lookup
>   v4
>  -  Stefano Stabellini
> 
> *  ARM PSCI v0.2 (done)
>   v11 posted
>  -  Parth Dixit
> 
> *  ARM  - IOMMU support (done)
>  -  Julien Grall
> 
> *  ARM Interrupt latency reduction (no maintenance interrupts) (done)
>  -  Stefano Stabellini
> 
> *  ARM DRA7 support (done)
>   v3 posted
>   v3 with comments applied
>  -  Andrii Tseglytskyi
> 
> *  ARM: Use super pages in p2m (done)
>   v5 posted
>  -  Ian Campbell
> 
> *  ARM Xen UEFI booting on ARM (done)
>   v5
>  -  Roy Franz
> 
> *  Cache QoS Monitoring - hypercalls (done)
>   Just hypercalls - no toolstack changes.
>   v15
>   Hit a snag with rdmsr/IPI/wrmsr/IPI, possible redesign
>  -  Chao Peng, Dongxiao Xu, and Shantong Kang
> 
> *  XenRT (Preemptive Global Earliest Deadline First) (done)
>   v3
>  -  Meng Xu
> 
> *  Introspection of HVM guests (done)
>   v10, split out in for 4.5 (smaller subset)
>  -  Razvan Cojocaru
> 
> *  alternative_asm in Xen (done)
>  -  Feng Wu
> 
> *  SMAP (done)
>  -  Feng Wu
> 
> *  Re-write of vHPET (done)
>   aka hvm/hpet: Detect comparator values in the past
>  -  Don Slutz
> 
> *  vAPIC in PVHVM guests (Xen side) (done)
>  -  Boris Ostrovsky
> 
> *  Xen PVH dom0 (done)
>  -  Mukesh Rathor
> 
> *  amd_ucode cleanups, verify patch size(enhancement) (mostly in master 
> except one patch)
> 
> *  Data breakpoint Extension support (new-feat) (in master)
> 
> *  Feature masking MSR support (enhancement) (in master)
> 
> *  Support BRCM TruManage chip (Serial over LAN support) (new-feat) (in 
> master)
> 
> *  fix vmce_amd* functions, unify mce_amd mcheck initialization 
> (fixes/cleanups)
> 
> *  multiple AMD container files appended together in initrd (early initramfs)
>  -  Aravind and Suravee
> 
> *  NUMA memory scrubbing (done)
>  -  Konrad Rzeszutek Wilk
> 
> *  ioreq-server, aka secondary emulators (done)
>  -  Paul Durrant
> 
> *  Soft affinity for vcpus (was NUMA affinity for vcpus) (good)
>   v11 posted
>  -  Dario Faggioli
> 
> *  HT enabled, virtualization overhead is high (Xen 4.4) (done)
>   kernbench demonstrated it
>   Looking and tracing
>   http://www.gossamer-threads.com/lists/xen/devel/339409
>   False alarm.
>  -  Dario Faggioli
> 
> == lib{xc,xl} and toolstack ==
> 
> *  pygrub does not handle certain configurations. (done)
>   went in after RC3
>  -  Andrew Cooper and Boris Ostrovsky
> 
> *  regression libxl bitmap handling during a restore.
>  -  Boris Ostrovsky and Wei Liu
>  -  done
> 
> *  Systemd integration (done)
>   Affects CentOS7, SLES12, Fedora Core 21 and Debian Jessie. Xen source 
> contains systemd files that can be used to configure the various run-time 
> services. In the past the distributions would carry their own version of it - 
> but now we host them. This is not yet complete - 
> [[http://lists.xenproject.org/archives/html/xen-devel/2014-10/msg03064.html 
> patches]] for this are being worked on for RC2.
>  -  Wei and Olaf
> 
> *  Stubdomains build issues (done)
>   stubdomains will not build. Fix is in staging (and will make RC2) or 
> [[http://lists.xen.org/archives/html/xen-devel/2014-10/msg02925.html 
> stubdom/Makefile should use QEMU_TRADITIONAL_LOC]]
>  -  Michael Young
> 
> *  Building against libxl (outside code) (done)
>   If you are building against libxl for any APIs before Xen 4.5 you will 
> encounter building errors.
>  -  Andrew Cooper
> 
> *  Build systems fixes/improvements (done)
>  -  Andrew Cooper
> 
> *  libxl work - JSON to keep track of guest configs (done)
>   Some patches merged, need to post more.
>  -  Wei Liu
> 
> *  Remus in Xen (libxl) (done)
>   v19
>   url:  https://github.com/macrosheep/xen/tree/remus-v19
>  -  Gui Jianfeng
>  -  Yang Hongyang
>  -  Dong, Eddie
> 
> *  libvirt and xl discard support, so that libvirt can start using it (done)
>  -  Olaf Hering
> 
> *  OSSTest: upstream QEMU (done)
>  -  Ian Campbell
> 
> *  rework VM Generation ID (done)
>   v7 posted
>  -  David Vrabel
> 
> *  systemd support (done)
>   v11
>  -  Luis R. Rodriguez
> 
> *  Soft affinity for vcpus libxl/xl changes (done)
>   v13 posted
>  -  Dario Faggioli
> 
> == QEMU ==
> 
> *  Bigger PCI hole in QEMU (done)
>   Needs to be rebased
>  -  Don Slutz
> 
> *  QEMU 2.0 branch for qemu-upstream (done)
>   It is v2.0 with 2.1 Xen backports.
>  -  Stefano Stabellini
> 
> *  Xen PV block driver in OVMF (UEFI in guest) (done)
>   v3
>   In OVMF upstream. Not part of Xen 4.5
>  -  Anthony PERARD
> 
> == Linux 3.18 and earlier ==
> 
> *  pvSCSI in Linux (fronted and backend) (done)
>   v6
>  -  Juergen Gross
> 
> *  Linux PVH dom0 (done)
>  -  Mukesh Rathor
> 
> *  Netback multiqueue (good)
>  -  Wei Liu
> 
> *  Linux pvops of Xen EFI hypercall support (done)
>  -  Daniel Kiper
> 
> *  "Short" grant copy (just header) of packets. (done)
>  -  Zoltan Kiss
> 
> *  Fix PAT in Linux kernel (aka Full support for PAT) (done)
>   Acked and reposted for v3.18. Waiting for x86 maintainers.
>   Ingo has been giving advice.
>   In for 3.19
>  -  Juergen Gross
> 
> *  vAPIC in PVHVM guests (Linux side) (done)
>   Going in for 3.19
>  -  Boris Ostrovsky
> 
> 
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