On 18/09/14 11:06, Daniel P. Berrange wrote:

On Thu, Sep 18, 2014 at 10:57:23AM +0200, Joaquim Barrera wrote:

...

Hi all,

I compiled a custom version of QEMU 2.0.0 and I am having hard times to make it available to libvirt. Just to clarify, if I execute

/usr/local/bin/qemu-system-x86_64

it does performs good. But when I put this very same path to <emulator> tag in a domain configutation, when i start the domain I get

error: Failed to start domain vm1 error: internal error: process exited while connecting to monitor: libvirt: error : cannot execute binary /usr/local/bin/qemu-system-x86_64: Permission denied

I tried setting +x permission to all the binaries in /usr/local/bin, disabling apparmor profile for libvirtd, creating and putting to complain a profile for /usr/local/bin/qemu-system-x86_64, creating a softlink to /usr/bin/kvm-spice to the custom binary and leaving <emulator> as default...

At the end of http://www.gossamer-threads.com/lists/openstack/dev/40033 I found something about AppArmor, and enabling bios.bin reading somewhere, but I got a little confused here.

The most disapointing thing here, is that using qemu 1.7 I could use my custom build, but apparently something changed with 2.0 (or with libvirt integration). From libvirt's POV the only things that should matter are

- Permission for 'qemu:qemu' user/group to execute the binary (and access parent directories) - AppArmour profile support, or SELinux label (as appropriate for disto)

Regards, Daniel

Thanks Daniel. When you say qemu:qemu I understant libvirt-qemu:kvm user/group? Because in my system there is no qemu user nor qemu group. Nevertheless, trying to move on, I recompiled QEMU with --prefix=/usr, to just override the original binaries (despite my will), and it worked partially. virsh start vm1 boots the VM but at the time to migrate it to another host: virsh migrate --persistent --verbose --copy-storage-inc vm1 qemu+ssh://gco-4:17179/system error: Unable to read from monitor: Connection reset by peer At this point, if the VM starts and I can open VNC connection) I guess that the answer will be that it's something QEMU related, and that libvirt doesn't have anything to do, but I just want to be sure about that. Thanks a lot.