Re: [Qemu-devel] nbd: Possible regression in 2.9 RCs

[ciprian . barbu]

Hi,

On 03.04.2017 21:52, Kashyap Chamarthy wrote:
On Fri, Mar 31, 2017 at 05:49:52PM +0000, Ciprian Barbu wrote:
Hi,

[...]

We also use libvirt v1.3.4, which might be a problem, but at least we
want to understand if the commit in question introduced an obvious
problem or if it's all in the details.

A tangential question -- Just curious, your environment
seems...interesting: given you are using a bit old (but above the
MIN_LIBVIRT_VERSION for Nova, which is currently 1.2.1) libvirt version,
with *RC2* of QEMU 2.9 with Nova, and testing live migration.  Me
wonders if this some kind of a custom OpenStack environment, or an
official upstream release that you're simply testing with a newer
version of QEMU...

Here in the OPNFV ARMBAND Team, the primary goal is to make the OPNFV 
release work on ARM aarch64 servers. We have clusters of servers from 
different vendors, this on in particular is based on the ThunderX cn8890 
SoC, which has received work for live migration from different sources. 
The problem is they have only been upstreamed in new versions of kernel 
and qemu. We tried to backport the changes to earlier versions, 
previously we were running kernel 4.4 and qemu v2.6.1.

But all of this is on top of Openstack Newton, and yes, we basically 
bumped the kernel, qemu and more recently libvirt too (v1.3.4). But as 
described earlier we were kind of forced into this situation.




[1]
http://git.openstack.org/cgit/openstack/nova/tree/nova/virt/libvirt/driver.py?id=068d851#n198


Btw, the qemu command generated by libvirt is this one, sorry about that:

2017-03-31 17:40:10.956+0000: starting up libvirt version: 1.3.4, package: 
0+amos3~u16.04 (Enea Armband Devops Team <armb...@enea.com> Fri, 13 Jan 2017 
02:06:05 +0100), qemu version: 2.8.50(Debian 1:2.9+amos2~u16.04), hostname: 
node-2.domain.tld
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 
QEMU_AUDIO_DRV=none /usr/bin/kvm -name instance-00000076,debug-threads=on -S 
-object 
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-14-instance-00000076/master-key.aes
 -machine virt-2.8,accel=kvm,usb=off,gic-version=3 -cpu host -m 256 -realtime 
mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 
2812f3c9-f564-499b-a8c7-e9e7ccf24143 -no-user-config -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-14-instance-00000076/monitor.sock,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew 
-no-shutdown -boot strict=on -kernel 
/var/lib/nova/instances/2812f3c9-f564-499b-a8c7-e9e7ccf24143/kernel -initrd 
/var/lib/nova/instances/2812f3c9-f564-499b-a8c7-e9e7ccf24143/ramdisk -append 
'root=/dev/vda1 rw rootwait console=tty0 console=ttyS0 console=ttyAMA0' -device 
i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1 -device 
pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 -usb -drive 
file=/var/lib/nova/instances/2812f3c9-f564-499b-a8c7-e9e7ccf24143/disk,format=qcow2,if=none,id=drive-virtio-disk0,cache=none,aio=native
 -device 
virtio-blk-device,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 
-drive 
file=/var/lib/nova/instances/2812f3c9-f564-499b-a8c7-e9e7ccf24143/disk.config,format=raw,if=none,id=drive-virtio-disk1,cache=none,aio=native
 -device virtio-blk-device,scsi=off,drive=drive-virtio-disk1,id=virtio-disk1 
-netdev tap,fd=27,id=hostnet0 -device 
virtio-net-device,netdev=hostnet0,id=net0,mac=fa:16:3e:82:0a:2b -serial 
file:/var/lib/nova/instances/2812f3c9-f564-499b-a8c7-e9e7ccf24143/console.log 
-serial pty -vnc 0.0.0.0:0 -k en-us -device 
VGA,id=video0,vgamem_mb=16,bus=pci.2,addr=0x1 -device 
virtio-balloon-device,id=balloon0 -msg timestamp=on
Domain id=14 is tainted: high-privileges

[...]