Re: [Qemu-devel] Regression "Warning: more nics requested than this machine supports"

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2011-05-20 13:19, Peter Maydell wrote:
> On 16 May 2011 17:58, Markus Armbruster <armbru@redhat.com> wrote:
>>    $ qemu-system-x86_64 -nodefaults -enable-kvm -m 384 -vnc :0 -S -netdev user,id=net0 -device e1000,netdev=net0
>>    Warning: more nics requested than this machine supports; some have been ignored
>>    (qemu) info network
>>    Devices not on any VLAN:
>>      net0: net=10.0.2.0, restricted=n peer=e1000.0
>>      e1000.0: model=e1000,macaddr=52:54:00:12:34:56 peer=net0
>>
>> Culprit is
>>    net: Improve the warnings for dubious command line option combinations
> 
>> Its count of requested NICs is blissfully unaware of -device.  In my
>> example, it comes up with nb_nics == 0 and seen_nics == 1.
> 
> As far as I can determine, "-device e1000,netdev=0" doesn't go through
> net_init_nic() and doesn't put an entry in the nd_table[] for the NIC.
> This means it's broken, because a lot of board models look in nd_table[]
> to determine whether the user requested a NIC and whether it's the right
> type. So I think that in some ways this is just showing up an existing
> problem with trying to instantiate a network card with -device.

qemu_new_nic must call net_init_nic so that this works properly. Of
course we need to avoid calling it multiple times when the adapter is
still instantiated via the old -net or via board init code.

Jan

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