On Tue, Jan 06, 2015 at 01:55:57PM -0600, Johnny Hughes wrote:
Ok I just used a couple of hours testing Xen 4.4.1 rpms on CentOS 6.6 with Linux 3.10 dom0 kernel. This session was all about xm/xend testing. I manually enabled xend first.
What Works OK:
- Manually creating/managing guests with xm and domU cfgfiles in /etc/xen and LVM volumes as storage (phy backend).
- Manually creating/managing guests with xm and domU cfgfiles in /etc/xen and file images as storage (tap2:aio backend).
- Using virt-install to install PV domUs using LVM volumes as storage (phy backend).
- Using virt-manager to install PV domUs using LVM volumes as storage (phy backend).
What doesn't work:
- Using virt-manager to install PV domUs using file images as storage (tap:aio backend).
This libvirt/blktap2 file images failure with Xen 4.4 rpms is a regression from Xen 4.2 rpms, where blktap2 works OK with libvirt/virt-install/virt-manager.
The problem is most probably the fact that we had custom patches included in the xen4c6 libvirt rpms that we shipped with the Xen 4.2 rpms. We had to add two patches, one patch to fix the blktap2 backend type in libvirt, and one patch to fix the blktap2 backend type in virt-install or virt-manager, i'm not totally sure which one it was. Those patches should be included in the earlier libvirt source rpms, so we can check there. Or I can search thru my emails, because I hunted that down earlier aswell.
It seems we still need those patches with the latest libvirt rpms too.
The actual problem is libvirt/virt-manager tries to configure tap:aio: backend, which won't work. It needs to be tap2:aio.
I get the exactly same behaviour with xm/xend. "tap:aio" stalls and fails. "tap2:aio" works OK.
Now with the new python-virtinst and then new kernel from here:
http://people.centos.org/hughesjr/xen4-test/
But with the new libvirt-1.2 and xen 4.4 from this repo, everything seems to work with xend enabled.
Yep, with the updated python-virtinst all works now, also with the Xen 4.4 rpms.
Thanks a lot!
-- Pasi