[libvirt] [RFC PATCH v2 REBASE 00/18] Introduce vGPU mdev framework to libvirt

[Laine Stump]

On 03/16/2017 03:17 AM, Chen, Xiaoguang wrote:
> the screen call trace while start the VM (same for Ubuntu, Win10 etc) ======================================================
> 
> ubuntu at z-nuc-11:~/vgpu-meta/libvirt-stage$ myvirsh start vgpu-ubuntu
> 2017-03-09 19:06:50.483+0000: 2232: info : libvirt version: 3.1.0
> 2017-03-09 19:06:50.483+0000: 2232: info : hostname: z-nuc-11.maas
> 2017-03-09 19:06:50.483+0000: 2232: warning : qemuDomainObjTaint:4056 : 
> Domain id=1 name='vgpu-ubuntu' uuid=972b5e38-0437-11e7-8f97-d36dba74552d
> is tainted: high-privileges

I haven't considered any of the rest of the log yet, but this caught my
eye on a first pass - "high-privileges" means that you're running qemu
as root, so your test is bypassing several issues that could cause vfio
device assignment to fail on a "standard" system. It shouldn't be
necessary to run qemu as root in order for device assignment to work. Is
there some specific reason that you're doing it this way? (I'm guessing
that you've set "user = root" in /etc/libvirt/qemu.conf)