virt February 2009

virt@lists.fedoraproject.org

18 participants
21 discussions

ruby-libvirt failure [was Re: [fedora-virt-maint] Fedora rawhide rebuild in mock status 2009-02-20 i386]
by Mark McLoughlin 23 Feb '09

23 Feb '09

On Sat, 2009-02-21 at 21:14 -0600, Matt Domsch wrote: > Fedora Rawhide-in-Mock Build Results for i386 > based on rawhide as of Friday Feb 20, 2009. > > Most packages were actually built as of the F11 Alpha cut on or around > Feb 1. Any newer packages in rawhide as of Feb 20 were then pulled in > and rebuilt, and any previously-failed packages were also rebuilt, so > I believe this list to be current and correct. I did have a couple > servers fail during the builds, so it is possible that at most 8 of > these are not true failures, but a result of builders crashing. Don't > pin your hopes on that though. :-) > > Full logs at http://linux.dell.com/files/fedora/FixBuildRequires/ ... > ruby-libvirt-0.1.0-2.fc11 (build/make) lutter,stahnma,clalance,virtmaint http://linux.dell.com/files/fedora/FixBuildRequires/mock-results/i386/ruby-… Loaded suite /usr/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/rake_test_loader Started . libvir: Test error : Domain not found . . ./tests/tc_connect.rb:165: [BUG] Segmentation fault ruby 1.8.6 (2008-08-11) [i386-linux] rake aborted! Command failed with status (): [/usr/bin/ruby -Ilib:ext/libvirt "/usr/lib/...] (See full trace by running task with --trace) Cheers, Mark.

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Fedora virt status
by Mark McLoughlin 20 Feb '09

20 Feb '09

2009-03-03 Feature freeze (11 days) 2009-03-10 Beta Freeze (18 days) 2009-04-14 Final freeze (53 days) A short report this week, since I was travelling. libvirt 0.6.0 ============= Dan Berrange fixed the nasty D-Bus threading related segfault introduced in libvirt 0.6.0: https://bugzilla.redhat.com/484553 http://www.redhat.com/archives/libvir-list/2009-February/msg00357.html He then pushed a new libvirt-0.6.0 update to fix the last remaining known issues with the 0.6.0 update in F9/F10: * Wed Feb 18 2009 Daniel P. Berrange <berrange(a)redhat.com> - 0.6.0-4.fc11 - Fix QEMU startup timeout/race (rhbz #484649) - Setup DBus threading. Don't allow dbus to call _exit / change SIGPIPE (rhbz #484553) - Fix timeout when autostarting session daemon sVirt ===== Dan Walsh posted the latest sVirt patch to libvir-list for review: http://www.redhat.com/archives/libvir-list/2009-February/msg00343.html He also followed that up with a patch to python-virtinst to make it assign security labels to guests: http://www.redhat.com/archives/libvir-list/2009-February/msg00372.html VT-d ==== David Woodhouse submitted the rwbuf quirk patch to Linus: https://lists.linux-foundation.org/pipermail/iommu/2009-February/001117.html The patch made it into rawhide, closing out: https://bugzilla.redhat.com/479996 David also made intel_iommu=on the default again in rawhide: * Sat Feb 14 2009 David Woodhouse <David.Woodhouse(a)intel.com> - Enable DMAR by default again now that it works In the upstream bug report there are reports of a DMAR warning from the VGA controller on Lenovo x200: http://bugzilla.kernel.org/show_bug.cgi?id=12578 [ 0.216043] DMAR: Forcing write-buffer flush capability [ 0.928007] DMAR:[DMA Write] Request device [00:02.0] fault addr feff5e000 [ 0.928007] DMAR:[fault reason 05] PTE Write access is not set 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) Bhavesh points out that no further ill effects are noticed after the warning. Adar also points out some issues related to ixgbe on Dell Precision T5400. PCI Device Assignment ===================== There was some follow-up to the discussion about device unbinding, resetting and filtering: http://marc.info/?l=kvm&m=123454366317045 Chris Wright posted a patch for "remove_id": http://patchwork.kernel.org/patch/7210/ Adar reports more issues with his Dell Precision T5400. kvmclock ======== The patch to disable kvmclock on machines which don't have constant_tsc has been merged upstream for 2.6.29 and the patch has been dropped from rawhide. QEMU/KVM Merge ============== Glauber continued his work on BIOS packages: https://bugzilla.redhat.com/485418 Review Request: vgabios - vga option rom for bochs/qemu Turns out that this is buildable on all arches with dev86. https://bugzilla.redhat.com/485420 Review Request: openbios - Open Source implementation of IEEE 1275-1994 Some discussion whether fcode is needed to build, it appears not. https://bugzilla.redhat.com/485417 Review Request: bochs-bios - bios implementation from the bochs project Some discussion about whether it would be possible to build on all arches with dev86, but it turns out gcc is needed for some bits. block-rw-range-check.patch ========================== Eduardo posted a new version of Fedora's only non-upstreamed QEMU patch, the notorious block-rw-range-check.patch: https://bugzilla.redhat.com/486429 An EPEL bug was filed reporting that QEMu snapshots are also broken by the patch: https://bugzilla.redhat.com/486429 Eduardo reports that this is still an issue with his latest patches. Xen Dom0 ======== Michael Young reports on his progress building dom0 enabled kernel packages http://www.redhat.com/archives/fedora-xen/2009-February/msg00031.html Mass Rebuild ============ A mass rebuild of Fedora 11 is coming soon: http://www.redhat.com/archives/fedora-devel-list/2009-February/msg01083.html These are always the best fun. Expect sparks. Bugs ==== DOOM-O-METER: 193 open bugs last week, 188 this week. Woohoo! https://bugzilla.redhat.com/485564 Help broken when authenticated through userhelper Another virt-manager/consolehelper bug. Our use of consolehelper is going away soon, so Cole just closed out the bug and marked it as a dup of #459665. https://bugzilla.redhat.com/484986 grub-install fails on virtio disk https://bugzilla.redhat.com/480253 virt-clone fails for clone between storage types https://bugzilla.redhat.com/486112 Qemu should not be using pulseaudio when run as root. Some discussion of issues around privileged instances of QEMU using pulseaudio and the implications for SELinux based confinement of guests. https://bugzilla.redhat.com/244787 incorrect default keymaps Some discussion around dropping the -keymap argument to QEMU since the guests can now send scancodes rather than keysyms. https://bugzilla.redhat.com/486575 Ignores 'target dev=...' attribute in network devices libvirt doesn't allow using an explicit vnetXX for a tap device name.

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Fedora virt status
by Mark McLoughlin 13 Feb '09

13 Feb '09

2009-03-03 Feature freeze (18 days) 2009-03-10 Beta Freeze (25 days) 2009-04-14 Final freeze (60 days) Fedora Weekly News ================== The latest instalment of Fedora Weekly News is out, again with a detailed virt section: http://fedoraproject.org/wiki/FWN/Issue162#Virtualization Thanks to Dale Bewley. QEMU/KVM Merge ============== Glauber has been working hard towards merging the qemu and kvm packages. This week most of the effort involved producing packages for bochs-bios, openbios and vgabios. See this mail for more details: http://www.redhat.com/archives/fedora-virt/2009-February/msg00064.html The really nasty part - which Eduardo Hobkost ealier worked through with the etherboot package - is that although the BIOS binaries need to be built on a specific platform, they need to be available for install on all architectures. For example, Bochs is built on x86, but if you run qemu-system-x86_64 on ppc you need it there too. As an interim measure, all these packages will be first built on the required architecture, then the packager will download the new build, pack the images in a tarball and then re-build the package with this tarball. The second build will package the pre-built binaries on all arches, rather than building from source. In future, koji/rpm will support packages with ExclusiveArch that produce noarch packages. So, e.g. Bochs will be built only on x86 and the result will be a noarch package. See also: https://fedoraproject.org/wiki/Features/NoarchSubpackages The pacakge reviews for the three new packages are here: https://bugzilla.redhat.com/485417 https://bugzilla.redhat.com/485418 https://bugzilla.redhat.com/485420 PCI Device Assignment ===================== The offline discussion around device resetting, unbinding and filtering finally made it on-list here: http://marc.info/?l=kvm&m=123454366317045 The upshot is that some further kernel work is required before device assignment will be fully usable in Fedora. David Woodhouse's work continued on resolving the DMAR issues seen on some machines with intel_iommu=on: http://bugzilla.kernel.org/show_bug.cgi?id=12578 https://bugzilla.redhat.com/479996 David's first patch fixes a problem where one platform (Mobile 4 Series Chipset). The problem is that this chipset claims to not need explicit write buffer flushing, when it does in fact need it. David's patch just ignores the RWBF hint on that platform. This should fix the issues seen with Lenovo X200 and the Dell Latitude E6400. Another problem was found with the iwlwifi driver where the device is writing to buffers that the driver marks as read-only. David has added a fix for this issue to rawhide: https://bugzilla.redhat.com/485139 Shared Network Interface ======================== David Lutterkort updated libvir-list with his progress: http://www.redhat.com/archives/libvir-list/2009-February/msg00228.html After talking with Dan Williams, who is working in NetworkManager, it is clear that the network interface functionality for libvirt is also useful for NM and would help them with handling system-wide interface configuration. To accomodate that, I will implement network interface configuration in a separate library (inspiringly called 'netcf', until somebody thinks of something catchier) and add public API to libvirt that will use netcf to do the actual work. The F11 Feature page has also been updated: https://fedoraproject.org/wiki/Features/Shared_Network_Interface sVirt ===== Dan Walsh posted his thoughts on the sVirt patch set to libvir-list: http://www.redhat.com/archives/libvir-list/2009-February/msg00144.html It appears the patch is in good shape already and could be merged very soon. Dan Berrange replied with: I've reviewed all the submissions James has posted for comments so far, and am pretty happy with the way it now integrates with libvirt. If yourself & James are happy with what they're doing from a SELinux / security model point of view, then there's no reason they shouldn't be posted for final merge now. kvmclock and !constant_tsc ========================== The fix to disable kvmclock on hosts with no constant_tsc has no been pushed to Fedora 10: https://admin.fedoraproject.org/updates/kernel-2.6.27.15-170.2.19.fc10 Upstream, Avi has queued up the workaround for 2.6.29 here: http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git;a=commit;h=f160ca75 and the real fix is queued for 2.6.30 here: http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git;a=commit;h=48aa74b8 Worryingly, Levente Farkas noted that he has constant_tsc and is still seeing hangs which go away with clocksource=acpi_pm. Further investigation of this is required. https://bugzilla.redhat.com/475598 PVMMU ===== The issue with pvmmu and CONFIG_SLAB_DEBUG was resolved this week: https://bugzilla.redhat.com/480822 pvmmu causes net driver oops during guest install (new_slab) Marcelo came up with a guest kernel fix for pvmmu (only batch user pte updates), built in koji and James Laska ran some test installs using it. Unfortunately, James couldn't reproduce with latest rawhide and, obviously, also didn't see the issue with Marcelo's patch. Marcelo posted his patch upstream and some discussion with Jeremy Fitzhardinge yielded a patch to add a missing flush_lazy_mmu_mode() call to change_page_attr(): http://patchwork.kernel.org/patch/6531/ This patch has since been merged into Linus's tree for 2.6.29. libvirt 0.6.0 ============= Dan Berrange pushed an libvirt-0.6.0-2 with the following fixes: - Fix libvirtd --timeout usage - Fix RPC call problems and QEMU startup handling (rhbz #484414) - Fix unowned directories (rhbz #483442) Further issues with this release include: https://bugzilla.redhat.com/484199 AVC denied errors when starting KVM guest https://bugzilla.redhat.com/484555 SELinux issue causing libvirtd launched dnsmasq to fail Dan Berrange pointed out the selinux-policy changes needed. Miroslav Grepl and Dan Walsh made the changes in selinux-policy-3.5.13-45.fc10 which has been pushed to F10 updates-testing. https://bugzilla.redhat.com/484553 libvirtd segfault in libdbus after starting kvm guest Strangely, it proved to be very difficult to get a good trace of the segfault. In the end, the issue turned out to be nasty D-Bus/PolicyKit related segfault in libvirtd which hasn't been resolved yet. https://bugzilla.redhat.com/484649 Starting kvm guest sometimes fails - qemu taking too long? Guido Gunther committed a patch to fix this in upstream CVS. https://bugzilla.redhat.com/484552 libnuma: Warning: /sys not mounted or no numa system. Bogus warning being printed at library load time because libvirt now uses libnuma and libnuma was incorrectly complaining about missing sysfs files on no-numa systems. Neil Horman fixed in numactl-2.0.2-3. virt-manager ============ Cole merged the VM 'Overview' tab into the 'Hardware' tab and renamed it to 'Details'. He included some screenshots in his patch posting: http://www.redhat.com/archives/et-mgmt-tools/2009-February/msg00029.html Cole also built a new package in rawhide which uses PolicyKit instead of consolehelper. Also, this bug gives some insight into plans for virt-manager: https://bugzilla.redhat.com/459665 root consolehelper breaks remote ssh virt-manager/libvirtd connections Cole explains that this will be fixed when virt-manager no longer runs as root. David Cartwright points out this useful wiki page: http://virt-manager.et.redhat.com/page/RemoteSSH KVM === Marcelo has begun using patchwork to manage patches posted to the KVM list: http://patchwork.kernel.org/project/kvm/list/ Too many patches isn't a bad complaint for a project to have, right? Avi appears to have tagged kvm-84rc1 in git, so it looks like a new release is on the way. Don't tell anyone I told you! :-) Package Reviews =============== Rich Jones took it upon himself to complete the merge reviews for libvirt and gnome-applet-vm which had sat idle for 18 months: https://bugzilla.redhat.com/226055 https://bugzilla.redhat.com/225811 That's the spirit! Cole Robinson also took ownership of gnome-applet-vm from the original author, Karel Zak, in the process. Since package reviews are sometimes useful to refer back to, we've collected together links to all the package reviews for virt related packages here: https://fedoraproject.org/wiki/Virtualization_package_reviews Xen Dom0 ======== Michael Young posted a test kernel RPM containing Dom0 support: http://www.redhat.com/archives/fedora-xen/2009-February/msg00014.html Some discussion on how complete the current dom0 patchset is. Gerd's summary of the current situation is: If it goes well .30 boots as dom0 kernel. I don't expect much of the backend infrastructure makes it into .30 though (i.e. you need patches to actually run guests). At this point the changes needed might be non-invasive enough that it might be reasonable to carry them as patches in the fedora kernel. Michael is not to be deterred, though, and is preparing to start pushing these packages through Koji. Completely unrelated, Brad Smith brings attention to a common complaint that "virsh start -c" is needed to allow users to easily get to BIOS/pygrub screen at boot: https://bugzilla.redhat.com/468457 Xen and the Art of the NX Bit ============================= Phill on the fedora-virt points out that the No Execute (NX) bit is called the Execute Disable (XD) bit in Intel documentation: http://www.redhat.com/archives/fedora-virt/2009-February/msg00065.html By enabling NX, he was able to resolve his F10 guest boot failure: https://bugzilla.redhat.com/480880 Ian Campbell posted a patch upstream to fix the issue, but it looks like it may not have been merged yet. Bugs ==== DOOM-O-METER: 192 open bugs last week, 193 this week. Hrmph! https://bugzilla.redhat.com/478976 https://bugzilla.redhat.com/463765 https://bugzilla.redhat.com/471000 qemu-kvm not working with evdev giving wrong key mappings Some confusion about whether this is QEMU or evdev's fault, which Dan Berrange cleared up with: Yes, this *IS* a QEMU/KVM bug. It has hardcoded the assumption that there is a 1-to-1 mapping of scancodes to keycodes. This just happens to be true of the 'kbd' X driver, this is not true in general, thus QEMU breaks with evdev. QEMU must be fixed. https://bugzilla.redhat.com/484364 https://bugzilla.redhat.com/485148 block-rw-range-check.patch breaks qcow Two issues were found with our single out of tree patch for KVM. Eduardo, the hero that he is, promptly fixed both. https://bugzilla.redhat.com/484097 ambiguous dialog Guido Gunther supplied a patch and after consulting with the GNOME HIG posted a second, better patch. https://bugzilla.redhat.com/484599 Qemu monitor "system_powerdown" command does not work https://bugzilla.redhat.com/484295 F11 alpha boots ugly (after install) on xen paravirt Jeremy Fitzhardinge has fixed upstream. Fix is in 2.6.29-rc4.git4 https://bugzilla.redhat.com/469837 RFE: Support usb tablet in graphical setup via qemu Xorg has been fixed to properly handle USB tablets. We would like to be able to use USB tables by default for Fedora guests, but some work needs to be done to check that they are configured in absolute mode by default, rather than relative mode.

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qemu/kvm status
by Glauber Costa 13 Feb '09

13 Feb '09

Hello guys I hope you're all doing fine, with joy in your hearts. After a adventurous while, I have updated and QAed a new qemu srpm. I worked mostly on x86 and sparc QA, since they are the ones in which we have to build additional firmware. Speaking of firware, for the very same reason as etherboot[1], I'm proposing some new packages. They are: Bochs bios: http://glommer.fedorapeople.org/bochs-bios-2.3.8-0.1.git36989b0d2.fc11.src.… http://koji.fedoraproject.org/koji/taskinfo?taskID=1121809 OpenBIOS: http://glommer.fedorapeople.org/openbios-1.0-0.1.svn450.fc11.src.rpm http://koji.fedoraproject.org/koji/taskinfo?taskID=1119906 VGABIOS: http://glommer.fedorapeople.org/vgabios-0.6-0.1beta.fc11.src.rpm http://koji.fedoraproject.org/koji/taskinfo?taskID=1120633 I'm not shouting the final review yet, since I'd like to reach agreement on whatever matters may arise, in here. The qemu source package can be found at: http://glommer.fedorapeople.org/qemu-0.9.2-0.1.svn6392.fc11.src.rpm The x86 system emulator depends on bochs-bios and vgabios. The sparc system emulator depends on openbios Openbios should be used for powerpc too, but upstream is not yet confident on that. So as I was having troubles building it, I just left them commented for this round. If everybody is okay with that modulo minor comments to the packages, my next plan is: 1) Submmit new packages for review 2) Commit new qemu to CVS 3) Get KVM in the package. I prefer to do this in two steps, since it will get easier to spot anything that might go wrong 4) Have a bottle of wine. [1] Most firmware is compiled for one specific architecture, but should run on qemu whichever your host architecture is. We don't have a cross compiler infra in place, so we have to compile it natively. The easiest would be to pick binaries directly from upstream, which usually provides it. But we have policies that say we have to build everything we ship. So we have a crazy bootstrap process in place, in which we first build natively, and then feed a tar.gz for the other architectures. It means every package should be built at least twice in the process of getting something out of the door.

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[PATCH] xen: do not set NX bit when making initial pagetables readonly
by Ian Campbell 13 Feb '09

13 Feb '09

__supported_pte_mask has not been correctly configured at this point and Xen prevents us from using the NX bit if the hardware does not support it. Some BIOSes seem to offer the option to disable NX. Signed-off-by: Ian Campbell <ian.campbell(a)citrix.com> Cc: Mark McLoughlin <markmc(a)redhat.com> Cc: Jon Swanson <jswanson(a)valuecommerce.co.jp> Cc: fedora-virt(a)redhat.com Cc: Jeremy Fitzhardinge <jeremy(a)goop.org> Cc: Ingo Molnar <mingo(a)elte.hu> --- arch/x86/xen/enlighten.c | 24 +++++++++++++----------- 1 files changed, 13 insertions(+), 11 deletions(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index bea2152..e705bdf 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -53,6 +53,8 @@ #include "mmu.h" #include "multicalls.h" +#define _KERNPG_TABLE_RO __pgprot(_KERNPG_TABLE & ~_PAGE_RW) + EXPORT_SYMBOL_GPL(hypercall_page); DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); @@ -1487,9 +1489,9 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn) } for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE) - set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO); + set_page_prot(&level1_ident_pgt[pteidx], _KERNPG_TABLE_RO); - set_page_prot(pmd, PAGE_KERNEL_RO); + set_page_prot(pmd, _KERNPG_TABLE_RO); } #ifdef CONFIG_X86_64 @@ -1543,12 +1545,12 @@ static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, xen_map_identity_early(level2_ident_pgt, max_pfn); /* Make pagetable pieces RO */ - set_page_prot(init_level4_pgt, PAGE_KERNEL_RO); - set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO); - set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO); - set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO); - set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO); - set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO); + set_page_prot(init_level4_pgt, _KERNPG_TABLE_RO); + set_page_prot(level3_ident_pgt, _KERNPG_TABLE_RO); + set_page_prot(level3_kernel_pgt, _KERNPG_TABLE_RO); + set_page_prot(level3_user_vsyscall, _KERNPG_TABLE_RO); + set_page_prot(level2_kernel_pgt, _KERNPG_TABLE_RO); + set_page_prot(level2_fixmap_pgt, _KERNPG_TABLE_RO); /* Pin down new L4 */ pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE, @@ -1597,9 +1599,9 @@ static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY], __pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT)); - set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO); - set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO); - set_page_prot(empty_zero_page, PAGE_KERNEL_RO); + set_page_prot(level2_kernel_pgt, _KERNPG_TABLE_RO); + set_page_prot(swapper_pg_dir, _KERNPG_TABLE_RO); + set_page_prot(empty_zero_page, _KERNPG_TABLE_RO); pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd))); -- 1.5.6.5

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Re: [fedora-virt] bzImage dom0 kernel support in latest rawhide Xen packages
by Pasi Kärkkäinen 09 Feb '09

09 Feb '09

On Tue, Feb 03, 2009 at 10:18:53PM -0200, Itamar Reis Peixoto wrote: > I need to configure something to boot dom0 ? > Well you need to have dom0 kernel.. (there's no dom0 capable kernel in fedora/rawhide yet, so you need to compile/build/get one yourself). Nothing to configure really.. just configure grub.conf in the normal way to boot Xen and dom0 kernel. -- Pasi > > On Tue, Feb 3, 2009 at 6:24 PM, Pasi Kärkkäinen <pasik(a)iki.fi> wrote: > > Hello! > > > > For those interested in testing pv_ops dom0 kernels it seems latest Xen > > packages in rawhide contain bzImage dom0 kernel support in Xen hypervisor. > > > > > > rawhide report: 20090203 changes > > > > > > xen-3.3.1-3.fc11 > > ---------------- > > * Tue Feb 3 17:00:00 2009 Gerd Hoffmann <kraxel(a)redhat.com> - 3.3.1-3 > > - backport bzImage support for dom0 builder. > > > > > > -- Pasi > > > > _______________________________________________ > > Fedora-virt mailing list > > Fedora-virt(a)redhat.com > > https://www.redhat.com/mailman/listinfo/fedora-virt > > > > > > -- > ------------ > > Itamar Reis Peixoto > > e-mail/msn: itamar(a)ispbrasil.com.br > sip: itamar(a)ispbrasil.com.br > skype: itamarjp > icq: 81053601 > +55 11 4063 5033 > +55 34 3221 8599

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Xen pv_ops domU :: BUG() in remove_from_page_cache()
by Mark McLoughlin 07 Feb '09

07 Feb '09

Hi, 2.6.29-rc3 x86_64 guest on x86_64 RHEL5.3 host: https://bugzilla.redhat.com/484295 kernel BUG at mm/filemap.c:123! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC last sysfs file: /sys/devices/vbd-51712/block/xvda/xvda2/dev CPU 0 Modules linked in: ipv6 xts lrw gf128mul sha256_generic cbc dm_crypt dm_round_robin dm_multipath btrfs zlib_deflate libcrc32c xfs exportfs jfs reiserfs gfs2 msdos linear raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 xen_netfront xen_blkfront iscsi_ibft iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ext2 ext4 jbd2 crc16 squashfs pcspkr nfs lockd nfs_acl auth_rpcgss sunrpc vfat fat cramfs Pid: 975, comm: sh Tainted: G B W 2.6.29-0.66.rc3.fc11.x86_64 #1 RIP: e030:[<ffffffff810a8b9e>] [<ffffffff810a8b9e>] __remove_from_page_cache+0x40/0xde RSP: e02b:ffff88007081f928 EFLAGS: 00010002 RAX: 000000000000000d RBX: ffffe20002e9b900 RCX: 0000000000000005 RDX: ffff88000000ac48 RSI: fffffffffffffff0 RDI: ffff880000009700 RBP: ffff88007081f938 R08: 0000000000000009 R09: ffff88007fc010c8 R10: ffffffff81087cc0 R11: ffff88007fa0b328 R12: ffff88007ba2d160 R13: 000000000000003a R14: 0000000000000002 R15: ffff88007081f9e8 FS: 00007f0a1576d6f0(0000) GS:ffffffff81934000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007f6308fd5580 CR3: 0000000001001000 CR4: 0000000000000660 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000000 Process sh (pid: 975, threadinfo ffff88007081e000, task ffff880070dda390) Stack: ffff88007ba2d178 ffffe20002e9b900 ffff88007081f958 ffffffff810a8c67 ffffe20002e9b900 000000000000003a ffff88007081f978 ffffffff810b0b27 0000000000000002 ffffe20002e9b900 ffff88007081fa78 ffffffff810b0c2b Call Trace: [<ffffffff810a8c67>] remove_from_page_cache+0x2b/0x38 [<ffffffff810b0b27>] truncate_complete_page+0x4c/0x61 [<ffffffff810b0c2b>] truncate_inode_pages_range+0xef/0x36e [<ffffffff810b0eb7>] truncate_inode_pages+0xd/0x12 [<ffffffff810f0937>] dispose_list+0x3b/0xf8 [<ffffffff810f0ce1>] invalidate_inodes+0xdc/0xfa [<ffffffff810e0dea>] generic_shutdown_super+0x4a/0xe8 [<ffffffff810e0eaa>] kill_block_super+0x22/0x3a [<ffffffff810e0f91>] deactivate_super+0x68/0x7d [<ffffffff810f3f6d>] mntput_no_expire+0x10d/0x14e [<ffffffff810dfd22>] __fput+0x18a/0x197 [<ffffffff810dfd47>] fput+0x18/0x1a [<ffffffff810c0ae1>] remove_vma+0x4f/0x85 [<ffffffff810c0c32>] exit_mmap+0x11b/0x13d [<ffffffff8104800f>] mmput+0x45/0xa4 [<ffffffff8104bf97>] exit_mm+0x114/0x120 [<ffffffff8104dc12>] do_exit+0x1da/0x8b4 [<ffffffff8106ef5b>] ? lock_acquired+0x29e/0x2ae [<ffffffff81057ef5>] ? get_signal_to_deliver+0x61/0x2b8 [<ffffffff8104e36b>] do_group_exit+0x7f/0xaf [<ffffffff81383349>] ? _spin_unlock_irq+0x32/0x37 [<ffffffff8105812e>] get_signal_to_deliver+0x29a/0x2b8 [<ffffffff81010498>] do_notify_resume+0x90/0x8a4 [<ffffffff8138338e>] ? _spin_unlock_irqrestore+0x40/0x57 [<ffffffff8106c6a7>] ? trace_hardirqs_off_caller+0x1f/0xac [<ffffffff81383395>] ? _spin_unlock_irqrestore+0x47/0x57 [<ffffffff8106d609>] ? trace_hardirqs_on_caller+0x1f/0x153 [<ffffffff81209bc7>] ? tty_ldisc_deref+0x69/0x6e [<ffffffff81202b5c>] ? tty_read+0x87/0xba [<ffffffff81011381>] ? sysret_signal+0x5/0x109 [<ffffffff8106d609>] ? trace_hardirqs_on_caller+0x1f/0x153 [<ffffffff81011417>] sysret_signal+0x9b/0x109 Code: 24 08 e8 3a ad 0e 00 48 c7 43 18 00 00 00 00 49 ff 8c 24 c8 00 00 00 be 09 00 00 00 48 89 df e8 e9 f3 00 00 8b 43 0c 85 c0 78 04 <0f> 0b eb fe 48 89 df e8 b7 35 03 00 f6 03 10 0f 84 84 00 00 00 RIP [<ffffffff810a8b9e>] __remove_from_page_cache+0x40/0xde RSP <ffff88007081f928> Cheers, Mark.

2 1

Weekly virt status
by Mark McLoughlin 06 Feb '09

06 Feb '09

2009-03-03 Feature freeze (25 days) 2009-03-10 Beta Freeze (32 days) 2009-04-14 Final freeze (67 days) F11 Alpha, Take 3 ================= The weird anaconda blocker which caused hang while moving to the timezone screen was never figured out, but it turns out that later rawhide didn't have this bug. Truly bizarre: https://bugzilla.redhat.com/482907 Because of this, rel-eng froze Alpha for the third time. After that things got even more messy and even more confusing: http://www.redhat.com/archives/fedora-devel-list/2009-January/msg01844.html Another blocker cropped up, this time VNC installs failing: https://bugzilla.redhat.com/483399 In the end, after a mere two day slip, the installer gods were appeased and Fedora 11 Alpha (blink) shipped to an eagerly waiting public: http://www.redhat.com/archives/fedora-announce-list/2009-February/msg00004.… On the virt side, the "disable kvmclock on machines with unsync TSC" workaround ended up making it in at the last minute: https://bugzilla.redhat.com/475598 Unfortunately, what looks like a pvmmu bug didn't get fixed in time: https://bugzilla.redhat.com/480822 This causes some guest installs on an F11 Alpha host to oops during heavy network activity. FWN === Another edition of FWN, and another excellent virt section: http://fedoraproject.org/wiki/FWN/Issue161#Virtualization Thanks to Dale Bewley. F11 Release Notes ================= Dale Bewley has begun work on the F11 release notes: http://fedoraproject.org/wiki/Documentation_Virtualization_Beat The "Unified Kernel Image" section provided some minior confusion on the fedora-virt list: 'The kernel package in Fedora 11 supports booting as a guest domU, but will not function as a dom0 until such support is provided upstream. The most recent Fedora release with dom0 support is Fedora 8.' To which one user responded: As I write this, I am running F10 on a hardware virt enabled machine ... and have installed F10 and other distros as guests. Hence, the statement above is unclear to me for F10 is running as both dom0 and domU. Am I not reading something right? The confusion here is that folks use the terms "dom0" and domU to refer to Xen, whereas the user in question is actually running KVM. The equivalent terms for KVM tend to just be "KVM host" and "KVM guest". libvirt ======= While on vacation, Daniel Veillard released libvirt 0.6.0: http://www.redhat.com/archives/libvir-list/2009-January/msg00863.html * New features: - thread safety of the API and event handling (Daniel Berrange) - allow QEmu domains to survive daemon restart (Guido Gunther) - extended logging capabilities (Daniel Veillard) - support copy-on-write storage volumes (Daniel Berrange) - support of storage cache control options for QEmu/KVM (Daniel Berrange) Understandably, a number of post-release issues cropped up: https://bugzilla.redhat.com/484199 SELinux issue causing libvirtd launched dnsmasq to fail This causes libvirt virtual networks to fail to start. The fix will involve a small update to libvirt and selinux-policy changes. https://bugzilla.redhat.com/484414 libvir: Remote error : no call waiting for reply with serial 2 Dan Berrange has a fix for this upstream Also, there are reports that if QEMU is too slow starting up, it can fail: http://www.redhat.com/archives/libvir-list/2009-February/msg00143.html A lively update was had as to whether the libvirt-0.6.0 update in F9 and F10 updates-testing should be withdrawn until some of the issues are resolved. The current plan is to just fix the issues ASAP with further updates to libvirt and selinux-policy. F11 Features ============ All F11 virt features are now available under: https://fedoraproject.org/wiki/Category:F11_Virt_Features KVM/QEMU Merge ============== Glauber posted an initial qemu package, and solicited feedback. This package did two things: 1) Updated to a snapshot of QEMU svn and 2) Split the package into multiple sub-package, with a sub-package for each target architecture There was some concern that updating to QEMU svn is not a good idea until it is known that a QEMU release is due soon. By coincidence, Anthony Liguori proposed doing a QEMU release at the end of February: http://lists.gnu.org/archive/html/qemu-devel/2009-02/msg00138.html All involved were mightily relieved. The discussion then moved on to a near-bikeshed argument about how to split the package. In the end, it was agreed to go with: - qemu-common, containing core bits - qemu-system-* packages containing emulators for groups of architectures, e.g. qemu-system-x86 - qemu-user, containing the Linux kernel ABI emulators for all architectures - qemu, a meta package which requires all sub-packages for compatibility purposes Further discussion was had on how to handle the building of BIOS images. [Details redacted to avoid scaring the children] The whole thread can be found here: http://www.redhat.com/archives/fedora-virt/2009-February/thread.html#00000 Also related, Eduardo added a kvm-tools sub-package containing kvm_stat and kvmtrace: https://bugzilla.redhat.com/480942 Device Assignment ================= The CONFIG_DMAR issue lumbered on this week. Firstly, Kyle McMartin's patch to make intel_iommu=off the default is now in Andrew Morton's queue for 2.6.29. Progress on fixing the underlying issue is slow, but steady: https://bugzilla.redhat.com/479996 The focus is now on the fact that delaying for 2us after flushing the I/O page tables from the CPU cache appears to resolve the problem. Adar and Bhavesh from VMware are busily debugging the issue on hardware which shows the problem. David Woodhouse and Chris Wright have been working on patches to aid debugging. David has also included Joerg Roedel's CONFIG_DMA_API_DEBUG patches in Fedora rawhide. In other news, a minor circular locking issue was found and fixed: http://www.mail-archive.com/kvm@vger.kernel.org/msg10116.html Also, Weidong Han re-posted several device assignment fixes for QEMU which had fallen through the cracks: http://www.mail-archive.com/kvm@vger.kernel.org/msg10116.html Some offline discussion was had around how to handle resetting PCI devices before and after assignming them to guests. The details are long and involved, but the core of the problem is that devices must be reset before being assigned if they have been previously used in the host. For example, with an e1000e NIC this manifests itself with "TX Unit Hang" errors in the guest. Unfortunately, the preferred method for resetting a PCI device (Function Level Reset, or FLR) is not implemented by many devices. Alternatives include Secondary Bus Reset and PCI PM D-state transitions. Both will need to be implemented in addition to FLR support. Xen Dom0 ======== Some welcome interest was renewed in Xen Dom0 support on the fedora-virt list this week with Gerd Hoffmann's addition of bzImage loading support to the hypervisor: http://www.redhat.com/archives/fedora-virt/2009-February/msg00001.html Several fedora-virt users are now building and testing Dom0 kernels using Jeremy Fitzhardinge's latest patch set. kernel arches ============= Some changes to kernel architectures are on their way: https://fedoraproject.org/wiki/Features/ArchitectureSupport The main user-visible changes would be: * 32-bit x86 would be built for i586 by default. * The x86_64 kernel would be installed on compatible hardware, even when installing a 32-bit OS * The PAE kernel would be installed on other 32-bit hardware, where it is supported The proposal was accepted by FESCo and the kernel changes are already in rawhide. gcc 4.4 ======== gcc-4.4 is coming in F11: https://fedoraproject.org/wiki/Features/gcc4.4 Jakub Jelinek did a test mass-rebuild of rawhide this week: http://www.redhat.com/archives/fedora-devel-list/2009-February/msg00180.html It seemed to go pretty well. No virt packages had any problems. Bugs ==== DOOM-O-METER: 191 open bugs last week, 192 this week. Awww! https://bugzilla.redhat.com/480822 new_slab() oops from alloc_skb() with virtio_net, e1000 and rtl8139 Marcelo jumped on this and began investigating. At first it looked like that it was a SLUB issue. However, the crafty Marcelo came up with a crafty LD_PRELOAD lib for disabling pvmmu for testing. Using Marcelo's hack, James Laska confirmed that the culprit is pvmmu. https://bugzilla.redhat.com/480779 https://bugzilla.redhat.com/483204 Both nVidia users who reported KVM MMU issues tryied to reproduce without nvidia loaded. The first reporter did indeed reproduce without nVidia and Marcelo logged into his machine. The problem turned out to be dodgy RAM though. Take home point - if something funny is going on, try running memtest. https://bugzilla.redhat.com/483648 BUG_ON() in __shrink_dcache_sb() in rawhide x86_64 guest Another oops reported by James Laska. Not yet investigated. https://bugzilla.redhat.com/484364 block-rw-range-check.patch breaks qcow2 Fedora's single not-upstream kvm-userspace patch causes us to fail under kvm-autotest. https://bugzilla.redhat.com/464790 qemu bios images source code not packaged The BIOS images in the qemu package aren't currently built from source. This is fixed in the kvm package, so should be resolved when we merge the two. https://bugzilla.redhat.com/484166 QEmu uses 100% of two assigned cores for XP guest Perhaps the known issue with guest CPU usage accounting? https://bugzilla.redhat.com/467687 https://bugzilla.redhat.com/463298 virbr0 loses it's routing when managed by NetworkManager Reporter can't reproduce after an upgrade to f10, but it seems fairly certain that the problem was something twiddling ip_forward. https://bugzilla.redhat.com/444273 The second request in recent times for libvirt autostart domains to be autoshutdown https://bugzilla.redhat.com/477955 Sound under KVM requires exclusive access to the sound device The debate continues on how to integrate with a user's sound configuration. https://bugzilla.redhat.com/459665 Issue with remote libvirt connections via SSH under virt-manager https://bugzilla.redhat.com/484097 ambiguous dialog Jon McCann noticed a virt-manager dialog: Not Enough Free Space The requested volume capacity will exceed the available pool space when the volume is fully allocated. (4000M requested capacity >2118M available) [No] [Yes] I say "Yes!". Or maybe "No!". No, "Yes!" ... :-) https://bugzilla.redhat.com/484295 xen pv_ops DomU BUG() after alpha install

1 0

QEMU new Package
by Glauber Costa 05 Feb '09

05 Feb '09

Hi guys. I've built a qemu image in here: http://koji.fedoraproject.org/koji/taskinfo?taskID=1102151 It contains the basic work to get qemu package updated. Basically, we're talking about getting the qemu code from svn and creating multiple packages, so one could grab just the architecture of interest. Todo, is the creation of a meta-package to grab'em all at once. This is also the first step in merging qemu and kvm packages, which I'd like to do in two steps. 1) This one. 2) replace qemu-svn with kvm-userspace The later is not as trivial as it seems. Nobody exercices this path usually, and we're likely to find bugs that prevent the build to finish (Well, I tested, and there _are_ bugs ;-) ). But I believe we can have it sorted out. If no one has any major opposition to the state of things, I intend to commit it to CVS tomorrow (with some minor changes), and put it into rawhide so we can start having a more serious testing out of it.

5 37

F11 features
by Mark McLoughlin 04 Feb '09

04 Feb '09

Hey, We're a bit behind on writing up descriptions for the virt features coming in F11, but here's the first two pages: https://fedoraproject.org/wiki/Features/VirtVNCAuth Define a mapping of SASL authentication into the VNC protocol, and implement it for QEMU and GTK-VNC, providing strongly authenticated, securely encrypted remote access of virtual guest consoles. https://fedoraproject.org/wiki/Features/KVM_PCI_Device_Assignment Assign PCI devices from your KVM host machine to guest virtual machines. A common example is assigning a network card to a guest. Please jump in with comments, testing, wiki edits, etc. Cheers, Mark.

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virt February 2009