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Re: [PATCH] libs/light: pass some infos to qemu
- To: Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 27 Jan 2021 10:06:43 +0100
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, "Wei Liu" <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Wed, 27 Jan 2021 09:06:58 +0000
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On Tue, Jan 26, 2021 at 11:42:23PM +0100, Manuel Bouyer wrote:
> On Mon, Jan 18, 2021 at 09:36:42AM +0100, Roger Pau Monné wrote:
> > [...]
> >
> > Note also that there are networking modes that don't use a bridge, so
> > you could likely end up with nics[i].bridge == NULL?
>
> I couldn't cause this to happen. If no bridge is specified in the
> domU's config file, qemu-ifup is called with xenbr0 as bridge name.
>
> I tried this:
> vif = [ 'mac=00:16:3e:00:10:54, gatewaydev=wm0 type=ioemu, model=e1000' ]
Right, that's because libxl__device_nic_setdefault will set the bridge
field to xenbr0 if empty.
I'm not opposed to this behavior, seeing as we don't have much other
option I'm afraid. I guess we could open the tap interface in libxl
and pass it to QEMU, so that libxl can call the hotplug script knowing
the tap interface name, but that seems non-trivial.
IMO if we go that route it needs to be documented that NetBSD only
supports bridged mode for emulated HVM network interfaces for the time
being.
Thanks, Roger.
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