October 2008 - Devel - libvirt List Archives

[libvirt] [PATCH] Fix possible segfault if starting qemu vm with an inactive virtual network
by Cole Robinson 07 Oct '08

07 Oct '08

The attached patch fixes a possible segfault if trying to start a domain which tries to use an inactive virtual network. We should explicitly catch that error and report it, but that's a separate patch. Thanks, Cole

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[libvirt] [PATCH] use C99 initializers for virState
by Guido Günther 07 Oct '08

07 Oct '08

Hi, attached patch uses C99 initializers for virStateDriver. Makes reading easier and extending the structure less error prone. -- Guido

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[libvirt] [PATCH] fix build in separate build-dir
by Guido Günther 06 Oct '08

06 Oct '08

Hi, building in a separate build dir is currently broken since the Makefile is looking for libvirt.policy in the wrong location. Fix attached. Cheers, -- Guido

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[libvirt] [discuss] The new cgroup patches for libvirt
by Balbir Singh 04 Oct '08

04 Oct '08

Hi, Everyone, I've seen a new set of patches from Dan Smith, which implement cgroup support for libvirt. While the patches seem simple, there are some issues that have been pointed out in the posting itself. I hope that libvirt will switch over (may be after your concerns are addressed and definitely in the longer run) to using libcgroups rather than having an internal implementation of cgroups. The advantages of switching over would be using the functionality that libcgroup already provides libcgroups (libcg.sf.net) provides 1. Ability to configure and mount cgroups and controllers via initscripts and a configuration file 2. An API to control and read cgroups information 3. Thread safety around API calls 4. Daemons to automatically classify a task based on a certain set of rules 5. API to extract current cgroup classification (where is the task currently in the cgroup hierarchy) While re-implementing might sound like a cool thing to do, here are the drawbacks 1. It leads to code duplication and reduces code reuse 2. It leads to confused users I understand that in the past there has been a perception that libcgroups might not yet be ready, because we did not have ABI stability built into the library and the header file had old comments about things changing. I would urge the group to look at the current implementation of libcgroups (look at v0.32) and help us 1. Fix any issues you see or point them to us 2. Add new API or request for new API that can help us integrate better with libvirt -- Balbir

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[libvirt] [PATCH 0 of 2] [RFC] Add cgroup manipulation and LXC driver support
by Dan Smith 04 Oct '08

04 Oct '08

This patch set adds basic cgroup support to the LXC driver. It consists of a small internal cgroup manipulation API, as well as changes to the driver itself to utilize the support. Currently, we just set a memory limit and the allowed devices list. The cgroup.{c,h} interface can be easily redirected to libcgroup in the future if and when the decision to move in that direction is made. Some discussion on the following points is probably warranted, to help determine how deep we want to go with this internal implementation, in terms' of supporting complex system configurations, etc. - What to do if controllers are mounted in multiple places - What to do if memory and device controllers aren't present - What to do if the root group is set for exclusive cpuset behavior Some additional caveats are noted per-patch as well.

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[libvirt] [PATCH 0 of 2] Add cgroup manipulation and LXC driver support
by Dan Smith 04 Oct '08

04 Oct '08

This is my updated set for cgroup manipulation. I think I have addressed all of the concerns and comments so far. There are no major caveats I'm aware of with this round.

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[libvirt] [PATCH] Clean up some uses qemudDebug
by Cole Robinson 03 Oct '08

03 Oct '08

The patch cleans up some uses of qemudDebug, moving them over to use the DEBUG macros. There are still lots of uses of qemudDebug in qemud/*, but I don't know if they can/should be moved over to use DEBUG. Thanks, Cole

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[libvirt] [PATCH] Fix > 1 char device for qemu VM
by Cole Robinson 03 Oct '08

03 Oct '08

Trying to start a qemu guest with more than 1 character device (serial or parallel, doesn't count for console) always times out. There was an error in the code that would strip the pty path qemu spits out, which confused the parsing after being called more than twice. The attached patch fixes this. I verified that guests with 0, 1, and 2 serial devices all boot fine. Thanks, Cole

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[libvirt] ./configure issues
by David Brain 02 Oct '08

02 Oct '08

Hi, Trying to compile libvirt on Centos 5.2, get the following when running configure: .... checking for struct _xmlURI.query_raw... no checking gnutls/gnutls.h usability... yes checking gnutls/gnutls.h presence... yes checking for gnutls/gnutls.h... yes checking for gnutls_handshake in -lgnutls... no configure: error: You must install the GnuTLS library in order to compile and run libvirt It's definitely installed: Installed Packages gnutls.x86_64 1.4.1-3.el5_1 installed gnutls.i386 1.4.1-3.el5_1 installed gnutls-devel.i386 1.4.1-3.el5_1 installed gnutls-devel.x86_64 1.4.1-3.el5_1 installed gnutls-utils.x86_64 1.4.1-3.el5_1 installed xmlsec1-gnutls.x86_64 1.2.9-8.1 installed xmlsec1-gnutls.i386 1.2.9-8.1 installed xmlsec1-gnutls-devel.i386 1.2.9-8.1 installed xmlsec1-gnutls-devel.x86_64 1.2.9-8.1 installed Thanks, David.

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[libvirt] Overriding vnetN with the <target> element in xml configuration not working
by Ahmed Medhat 02 Oct '08

02 Oct '08

Hello, I've been trying to dedicated a vnet interface to each virtual machine in order to be able to monitor their traffic, looking at http://libvirt.org/formatdomain.html#elementsNICSBridge it says that a virtual machine could have a specific vnetN specified in the xml element <target>, like <target dev='vnet7'/> . Unfortunately its not working and still it comes with vnet(current+1), here's my configuration for a qemu-kvm guest. <interface type='bridge'> <source bridge='virbr0'/> <target dev='vnet7'/> <mac address='00:16:3e:6c:1f:9d'/> </interface> I'm running on F9 x86_64, libvirt-0.4.4-2.fc9.x86_64 libvirt-python-0.4.4-2.fc9.x86_64 kvm-65-7.fc9.x86_64 qemu-0.9.1-6.fc9.x86_64 I haven't yet tested this with a RHEL box to know if it is version specific issue to open a bugzilla report, any input is appreciated. /* || Thanks, Ahmed Medhat || ultimatetux [at] gmail [dot] com || +2-012-4184768 || In a world without walls and fences, who needs Windows and Gates? */

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