Subject: [bug#29409] [PATCH 1/4] build: vm: Use netdev qemu parameter.

From: [email-masked] (Ludovic Courtès)
Date: Tue, 12 Dec 2017 10:00:16 +0100

Hi Mathieu,

Mathieu Othacehe <[email-masked]> skribis:

>> IIUC the “user” part means that it does more than just update to the new
>> syntax: it also enable user-level networking support (built-in DHCP
>> server, etc.).  Is this correct?
>>
>> If so, can we leave out “user”?
>
> Well it seems that you're right, "-net nic" is not functionnaly
> equivalent to "-net user" (=== "-netdev user").
>
> However, "-net nic" does not seem to be supported with -M virt on
> qemu-system-arm :
>
> qemu-system-arm -M virt -net nic
> Warning: requested NIC (anonymous, model unspecified) was not created
> (not supported by this machine?)
>
>
> trying to get a list of available devices (as explained in man page),
> gives :
>
> qemu-system-arm -M virt -net nic,model=help
> Warning: requested NIC (anonymous, model help) was not created (not
> supported by this machine?)
>
> So it seems that on ARM we will have to use "-netdev user", would it be a
> problem to use it too on intel systems ?

It’s not a problem per se, but it provides additional functionality
(QEMU’s built-in DHCP server and all that.)  It’s weird because it’s not
supposed to turn on emulation of a NIC, IIUC.

Maybe add it to the ARM-specific list of flags?

Ludo’.