From mboxrd@z Thu Jan  1 00:00:00 1970
From: gg@seh.de
Subject: Re: Test with VT-d patches
Date: Tue, 02 Sep 2008 20:40:06 +0200
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Hi, 


>On Tue, Sep 2, 2008 at 4:17 PM,  <gg@seh.de> wrote:
>> Hi,
>>
>> here comes a small part of the dmesg output. Qemu/KVM produces now a CPU 
>usage
>> of about 90%.
>>
>>
>> Sep  2 11:27:35 ubuntu klogd: [  335.057707] ------------[ cut here 
>]------------
>> Sep  2 11:27:35 ubuntu klogd: [  335.057711] WARNING: at 
>kernel/irq/manage.c:180 __enable_irq+0x34/0x80()
>> Sep  2 11:27:35 ubuntu klogd: [  335.057713] Unbalanced enable for IRQ 21
>[...]
>> This messages comes endless.
>> Something with IRQs?
>
>Hum, seems that interrupt has already been enabled... did you load the
>driver for the NIC in the host? With pass-through the device is
>"owned" by the guest.

No.
The driver was not loaded. 
It is not possible to start qemu with a pci-device used by the host.
(I try this with the second network device.)

Can this interrupt be shared with an other IRQ?

Gregor