[libvirt-users] Virtio serial exposition

[Daniel P. Berrange]

On Wed, Aug 26, 2015 at 12:17:20PM +0000, Jean-Pierre Ribeauville wrote:
> Hi,
> 
> I try to exchange datas  between host and Guest  by adding these lines in a guest .xml conf file :
> 
> <channel type='pty'>
>       <target type='virtio' name='arbitrary.virtio.serial.port.name'/>
>       <address type='virtio-serial' controller='0' bus='0' port='1'/>
>     </channel>
> 
> 
> Then  /dev/virtio-ports/arbitrary.virtio.serial.port.name is exposed in the guest and a /dev/pts/x  is seen as source path on the host.
> 
> I checked that on two Linux hosts :
> 
> 1)
> 
> libvirt-daemon-driver-qemu-1.2.8-16.el7_1.3.x86_64
> qemu-kvm-1.5.3-86.el7_1.5.x86_64
> qemu-kvm-common-1.5.3-86.el7_1.5.x86_64
> qemu-guest-agent-2.1.0-4.el7.x86_64
> ipxe-roms-qemu-20130517-6.gitc4bce43.el7.noarch
> qemu-img-1.5.3-86.el7_1.5.x86_64
> Linux sparring 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> 2)
> 
> qemu-img-0.12.1.2-2.415.el6.x86_64
> qemu-kvm-0.12.1.2-2.415.el6.x86_64
> gpxe-roms-qemu-0.9.7-6.10.el6.noarch
> 
> 
> Linux orion 2.6.32-431.el6.x86_64 #1 SMP Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> 
> The device is only exposed on the guest of the first host .
> 
> Is it due to a too old version of qemu and/or Linux  on the second host
> or some packages  missing on this second host ?

Libvirt should tell you if qemu / host is too old, so sounds like a
guest issue instead. Perhaps the guest kernel-module has not been
loaded for the second guest ?


Regards,
Daniel
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