Re: [Adeos-main] Reworking ipipe timer subsystem,

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 04/03/2012 07:38 PM, Jan Kiszka wrote:
> On 2012-04-03 13:06, Gilles Chanteperdrix wrote:
>> On 04/03/2012 09:59 AM, Jan Kiszka wrote:
>>> On 2012-04-03 09:54, Gilles Chanteperdrix wrote:
>>>> On 04/02/2012 11:58 PM, Jan Kiszka wrote:
>>>>> On 2012-04-02 23:55, Gilles Chanteperdrix wrote:
>>>>>> On 04/02/2012 10:59 PM, Jan Kiszka wrote:
>>>>>>> On 2012-04-02 22:56, Jan Kiszka wrote:
>>>>>>>>> No luck, I am using qemu 0.12.5, there is no -global option documented,
>>>>>>>>
>>>>>>>> Err, that's prehistoric. Use stable 1.0.x at least to receive proper
>>>>>>>> HPET support.
>>>>>>>
>>>>>>> Oh, and there is one further pitfall: You need to provide
>>>>>>> -no-kvm-irqchip to use the HPET with MSI support because qemu-kvm does
>>>>>>> not forward those MSIs to the kernel irqchip model. I'm sitting on
>>>>>>> patches...
>>>>>>
>>>>>> Yes, I needed that. It works now, except that I could not find how to
>>>>>> use an NFS root filesystem. But with an ext3 file-backed filesystem, I
>>>>>> could get that:
>>>>>
>>>>> If your NFS server runs on the host and you use userspace networking
>>>>> (default without additional parameters), the guest should be able to
>>>>> reach the server under 10.0.2.2 and use an IP like 10.0.2.15 (or dhcp).
>>>>> However, I recently failed to get this working as well but didn't dig
>>>>> deeper.
>>>>
>>>> Well, with -net user, I do not get any network interface on the
>>>> simulated kernel. Maybe there a special network driver to enable in the
>>>> kernel? The documentation does not say which network card is simulated,
>>>> and I do not see any with lspci.
>>>
>>> qemu-kvm emulates a rtl8139 by default. But, by just specifying -net
>>> user, you disable any network adapter. Just leave it out, -net user -net
>>> nic,model=rtl8139 is default.
>>
>> How is -net user supposed to work if there is no emulated nic on the
>> board. I tried -net nic first, but it did not work either, it seems to
>> use vlans, but I do not have vlans configured on my host nor any desire
>> to configure them. Is there not a way to simply share the host network
>> interface with the guest, the way virtualbox does it?
> 
> QEMU vlans have nothing to do with vlan frames on the wire.
> 
> Just leave out any -net command line switch and you will get a 8139
> attached to a userspace networking stack out of the box.

Ok, I get it, I need -net nic -net user. The first is for the nic in the
guest, the second configures by what means the physical network will be
emulated. I would have liked the qemu guest to appear on my LAN, but
that will do.

-- 
					    Gilles.