On 12/17/19 5:52 AM, abhishek jain wrote:
Hi
I am new to Libvirt and is starting Chassis but getting following error
qemu-system-x86_64: -netdev
tap,id=net0,ifname=tap01,vhost=on,script=no,downscript=no: tap: open
vhost char device failed: Operation not permitted
You aren't using libvirt, you are running the qemu-system-x86_64 command
directly.
What could be the reason
Since you're not actually using libvirt in this example, this isn't the
best place to ask, but based on the error message, I'd say that you are
running qemu-system-x86_64 as an unprivileged user, and qemu is trying
to open the device /dev/vhost-net, but can't due to the lack of privileges.
If you used a libvirt-based management application to start your qemu
(e.g. virsh, virt-manager, cockpit, ovirt, openstack) then they would
call the libvirtd daemon, which is running with full root privileges and
would open the vhost-net device, then pass that to an unprivileged qemu.
If you really must continue using qemu directly, then you'll need to
either stop using vhost=on, or run qemu as root (and take all the
security risks associated with that).
Regards
Abhishek
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