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Re: [libvirt] [Xen-devel] [PATCH LIBVIRT] libxl: Recognise ARM architectures



On Fri, Feb 28, 2014 at 02:12:30AM +0000, Ian Campbell wrote:
> On Wed, 2014-02-26 at 15:01 +0000, Daniel P. Berrange wrote:
> > Yep, if ARM has a PV console, then we'd need to add  tiny bit to the XML
> > to allow us to configure that explicitly, similar to how we do for KVM's
> > virtio-console support.
> 
> Do you mean I need to add something to the XML config snippet, or I need
> to add some special handling in the XML parser/consumer?
> 
> I've grepped around the virtio-console stuff and I'm none the wiser.

Opps, yes, I should have explained this better, since our docs here are
about as clear as mud.

With traditional x86 paravirt Xen, we just have the plain paravirt console
devices

    <console type='pty'>
      <target type='xen'/>
    </console>

With x86  fullvirt Xen/KVM/QEMU, the console type just defaults to being
a serial port so you would usually just add

    <serial type='pty'>
    </serial>

and then libvirt would automatically add a <console> with

    <console type='pty'>
      <target type='serial'/>
    </console>


With x86 fullvirt KVM, we also have support for virtio which is
done using

    <console type='pty'>
      <target type='virtio'/>
    </console>


So actually this leads me to ask what kind of console Arm fullvirt Xen
guests actually have ? If they just use the traditional Xen paravirt
console, then we just need to make sure that this works for them by
default:

    <console type='pty'>
      <target type='xen'/>
    </console>


If there's a different type of console device that's not related to
the Xen paravirt console device, then we'd need to invent a new
<target type='xxx'/> value for Arm.

Regards,
Daniel
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