[fedora-virt] Fedora virt status
markmc at redhat.com
Tue Jun 23 17:49:21 UTC 2009
Phew, Fedora 11 has just been released and Fedora 12 is already coming
at us hard:
2009-07-28 Feature Freeze (36 days)
2009-09-22 Beta (Final Development) Free (92 days)
2009-10-20 Final Release Compose (120 days)
We've prepared a good bunch of feature pages so far for F-12:
In the kernel related space we have:
- Huge pages
For QEMU, we have:
- Stable PCI Addresses
- Stable Guest ABI
- KVM NIC hotplug
- VNC resource tunnel
In the libvirt space we have:
- Host network interface APIs
- Storage management APIs
General virt tools related features include:
Also, of note is the feature describing NetworkManager's forthcoming
support for bridged networking:
Please do jump in and give help or feedback where you can!
F-12 Release Engineering
Some of the Fedora release engineering folks held a Fedora Activity
Day (FAD) at Red Hat's offices in Raleigh recently:
They came away from the meeting with a bunch of proposals intended to
improve the Fedora development process:
What was called the Preview release is now called Beta, what was
Beta is now called Alpha and what was called Alpha is no more.
The goal is to have a place where people can go to find the "last
known good" rawhide tree.
All packages coming from Koji will be signed - i.e. rawhide
packages will be signed.
A core set of packages will receive special attention when they
are being updated to try and reduce the chance of major
Rawhide will no longer freeze when we hit the Beta Freeze, instead
rawhide will continue to be published from the devel/ CVS branch
and there will be new install trees immediately available for the
new CVS branch (e.g. the F-12/ branch).
Fedora Community Portal
A new web interface for Fedora community members is no available:
Fedora Community provides a window into the Fedora distribution,
leveraging the power of Fedora's Account System, Bodhi, Bugzilla,
Koji, and PackageDB into a single user-friendly website.
Fedora Community is designed to simplify Fedora workflows and bring
transparency to Fedora processes.
Anthony Liguori posted his plans for QEMU's 0.11 release:
0.10.0 was released on March 2nd so following with the 6 month
release cycle, that would put 0.11.0 at September 2nd.
Based on the experiences with the stable releases, here's what I'd
o On July 15th, fork master -> stable-0.11
o Change version to 0.10.90
o Release qemu-0.11.0-rc1
o Release additional -rcN releases every 1-2 weeks
o Introduce a new maintainer for stable-0.10 (via git pulls)
o At least 1 week before release, hopefully we'll have the final
-rcN that we can then declare 0.11.0.
Avi confirmed that he plans to mirror these releases with matching
For Fedora 12, we already have a 0.11 snapshot (0.10.50-6.kvm86.fc12)
and as new snapshots become available we will pull them in. This means
we should have a feature frozen qemu in time for the F-12 feature
freeze and a final 0.11 release in time for the final F-12 freeze.
Rich Jones continues rocking with his libguestfs working, with a whole
load of interesting stuff on the fedora-virt list and his blog.
Rich always does his best to assure us that he really is crazy, but
his libguestfs "supermin appliance" work takes the biscuit:
The supermin appliance removes the kernel and all the executable
libraries and programs from the appliance. That just leaves a
skeleton of config files and some data files, which is obviously
massively smaller than the normal appliance. At runtime we rebuild
the appliance on-the-fly from the libraries and programs on the host
(eg. pulling in the real /lib/libc.so, the real /bin/bash etc.)
The new appliance is a mere 500K, so libguestfs RPMs will be a lot
Cole Robinson posted an RFC detailing his plans to create a libosinfo
library replacing python-virtinst's OS_TYPES dictionary which contains
valuable information on the preferred configuration for different
I've done the initial work for a new library, libosinfo (better name
recommendations appreciated). This library will provide OS meta data
for use in virt applications, replacing the dictionary we currently
keep in virtinst.
Another couple of Fedora Weekly News virt roundups from Dale Bewley:
Gerd is planning on pushing a xen-3.4.0 update to F-11:
Not yet. I wanna give it a bit more testing in rawhide. Also it
looks like xensource wants to release 3.4.1 quickly to fix a bunch
of important bugs. I think it is a good idea to wait until that
one is out, then update F11 straight to xen-3.4.1.
Also xen 3.4 bumps the shared library major for some libraries from
3.2 to 3.4, so I'll have to figure what breaks due to that and
coordinate the update. I know xenner is affected. Libvirts seems
to do fine as it needs libxenstore only which is still at 3.0.
Didn't investigate yet what else might need a rebuild.
Also, Michael Young continues to push new Dom0 kernel builds:
Unfortunately, Dom0 seems to have missed the 2.6.31 boat, so Dom0
support in Fedora 12 looks highly unlikely.
= New Bugs =
== kvm ==
F-11 guest takes 45 minutes in mke2fs for 8gb fs on virtio disk
with a sparse backing file
A report of mke2fs taking forever during an anaconda install of an
F-11 guest when using a virtio disk with a sparse backed
file. Apparently, SLES-11 doesn't appear to suffer from the
Poor KVM guest performance doing kernel builds (100+% overhead, w/
8vcpu and virtio)
Another report from Erik highlighting performance problems with
KVM and disk I/O.
"MAX_LOCK_DEPTH too low!" warning during kvm guest startup
GPF in nf_conntrack_alloc() with KVM guests (2.6.31)
An oops in core networking code as a result of routing packets
back and forth between two guests.
== qemu ==
removing virtualization packages leaves qemu-system-x86
'yum groupinstall Virtualization' installs qemu-system-x86 via the
qemu-kvm meta-package, but 'yum groupremove Virtualization' only
removes qemu-kvm. Looks like expected behaviour for yum.
qemu-kvm VNC :: major display tearing garbage with windows guest
and scrolling windows
This looks like a similar issue to xterm getting garbled in a
Fedora guest (bug #503156)
qemu-nbd dies with 'nbd.c:nbd_receive_request():L465: read failed'
Looks like qemu-nbd dies when a client closes its end.
qemu ppc/ppc64 boot says "Boot failure! No secondary bootloader
Yet another bug with the ppc target. This time only in rawhide.
== libvirt ==
libvirt always places IDE disks before virtio/scsi disks
If you attach an IDE disk to a guest booting from a virtio disk,
libvirt ends up sorting the disks such that the guest will try and
boot from the IDE disk.
RFE: use virt-manager to create network bridges
A bugzilla basically requesting the 'Shared Network Interface'
libvirtd segfault during virsh dominfo on security model
'virsh dominfo' was causing libvirtd to segfault because the
selinux was blown away by virGetCapabilities(). Fixed upstream,
needs to be pulled into F-11.
libvirt should ignore NUMA cells with missing topology
It turns out some NUMA cells can be missing topology information,
and libvirt should ignore these. Dan has come up with a patch
which works well for the reporter.
virsh: renaming of guests creates a copy
libvirt starting a guest with ISO on NFS mount fails when
unnecessarily setting SELinux file context
Tim Waugh supplied a patch for this one.
== svirt ==
svirt prevents symlinks to be used in disk image paths
If any part of a disk image path is a symlink, svirt denies qemu
access to it. This will be fixed in a selinux-policy update soon.
== virtinst ==
virtinst ignores VirtualDisk(sparse = False) and doesn't
pre-allocate the disk image
Pre-allocation of disk images was disabled until it could be done
without blocking libvirtd. This was fixed in libvirt-0.6.3, so to
enable nonsparse disks in F-11 we would need to first backport the
change from 0.6.3.
virtinst: make SLES11 guests use virtio by default
Looks like SLES11 guests work well with virtio, should make
virtinst enable it by default.
== virt-manager ==
virt-manager gets sparse/nosparse mixed up in New VM dialog
virt-manager currently gets confused between sparse/nonsparse. Not
that it matters since virtinst currently ignores it.
virt-manager's new VM dialog does not use storage pool interface
virt-manager's dialog to connect an existing CD-ROM to an ISO does
not use storage pool interface
A couple of places where we should be using the storage poll
interface in virt-manager. Cole has now fixed these upstream.
== virt-mem ==
virt-mem "invalid argument in virDomainLookupByUUIDString" error
A known error with the virt-mem tools on F-11, Rich has a patch
= Resolved Bugs =
== qemu ==
kvm: -kernel option seems broken
Re-basing our qemu-roms-more-room.patch onto 0.10.5 introduced this
regression. Fixed in qemu-0.10.5-3.fc11
vgabios regression - 1440x900 resolution no longer available
Glauber has cherry-picked the code to fix this from 0.6c and
pushed a vgabios-0.6b-2.fc11 update to F-11.
"qemu-kvm -vga std" broken with vgabios 0.6c
Tom London bisected the problem down to a specific upstream
commit. It turns out the qemu is missing some code (which is in
latest boch, but not qemu) in order for 0.6c to work. We've
reverted to 0.6b (with some changes cherry-picked from 0.6c) in
F-12 for now.
== kvm ==
kvm: hw DR_* watchpoint registers are ignored
KVM in 2.6.29 does not virtualization the x86 debug registers so
GDB watchpoints do not work. However, this is implemented in
== etherboot ==
[qemu netboot] Eliminate 3 second delay on PXE boot
Request to simply rebuild etherboot with ASK_BOOT=-1 in order to
eliminate a pointless 3 second delay that most people don't ever
qemu-kvm PXE boot with e1000 results in bogus packets
Several people have reported PXE using a virtio NIC doesn't work
in F-11. It turned out to be an issue with gcc re-ordering writes
and was fixed simply by appropriately using the 'volatile' keyword
for the packet header. Fix available in etherboot-5.4.4-16.fc11
== svirt ==
svirt denials breaks KVM PCI device assignment
The virt_manage_sysfs SELinux boolean was added quite some time
ago which is enough to use PCI device assignment with SELinux in
svirt denials break USB device passthrough
Similar to bug #499259 where svirt breaks PCI passthrough, svirt
is denying qemu access to /proc, breaking USB passthrough. Dan
Walsh has added a virt_use_usb boolean to selinux-policy which, if
enabled, fixes the problem.
== libvirt ==
virt-manager should allow VM names with spaces in them
Apparently this is a 'feature', so WONTFIX.
== virtinst ==
virt-install SASL authentication support
virt-install doesn't currently have support for authenticating
using SASL. Cole has fixed this upstream now.
virtinst errors finding default bridge: upsets virt-manager
Cole fixed this upstream.
= Ongoing Bugs =
== qemu ==
Virtual machine fails to start without cdom - qemu: could not open
disk image /dev/sr0
Eduardo has posted a variant of Cole's patch upstream; Anthony has
requested further changes.
qemu segfault when VNC client disconnects
Gerd has fixed this upstream, just need to back-port the patch to
qemu-system-ppc on ppc host fails with "no opcode defined"
It looks like this bug should be fixed by a change upstream to
disable gcc optimizations for translate.c. Pavel still sees
"invalid opcode" errors, though. A qemu-0.10.5-3.fc11 update has
been pushed which might help.
== virt-manager ==
memory/vcpus changes in virt-manager do not persist across
Erik Jacobson points out that this issue affects CPU changes as
well as memory. virt-manager needs to explicitly make these config
virt-manager refuses to increase guest memory until max memory
change is first applied
Cole has fixed this upstream.
== koan ==
Windows installs require manual reboot in the middle
koan needs to acquire the ability to re-start a guest once the
first stage of the install has completed.
More information about the Fedora-virt