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?
>
>>
>> Something else, is it possible to run kvm using SCHED_FIFO policy? I
>> tried that and I almost got a lockup, was probably saved by throttling.
>
> Yes, but not without some patches and a lot of tuning on both guest and
> host side. A standard Linux kernel touches too many device models that
> will take a long time to make RT compatible. A simple access to a
> virtual graphic adapter will be like accessing a screwed up physical GPU
> with horrible latency.
Yes, ok, but my main interest was the timer interrupt. Besides this does
not explain why I get a lockup.
>
> Jan
>
--
Gilles.
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