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Re: [Xen-devel] Adaptec 4port tulip card - IRQ-Sharing dom0/domU

To: Stefan Neuwirth <neuwirt-xen-devel@xxxxxxxxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Adaptec 4port tulip card - IRQ-Sharing dom0/domU
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 18 Aug 2006 09:59:23 +0100
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It's supposed to, but really it's not at all well tested. I can point you at
the code that's involved, if that's helpful to you?

 -- Keir

On 17/8/06 5:05 pm, "Stefan Neuwirth"
<neuwirt-xen-devel@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> I'm running xen-3.0.2-3 and try to share the 4 ports of a adaptec
> 4port ethernet card between dom0 and domU by using
> pciback.hide. Therefor I had to modify the domU driver for the tulip
> cards due to the fact that there is only one eeprom on the board and
> all 4 ports of the card are using the same interrupt line. When
> starting the dom0 tulip driver (unmodified) I get two working
> eth-interfaces, after starting the domU tulip driver (modified) I got
> two eth-interfaces inside of the guest. These interfaces are looking
> good when doing ifconfig, but when setting them up, the interrupts are
> going to dom0 (CPU usage of dom0 round about 95%) and the interfaces
> in the guest are not working.
> So my question is: Is it possible to share the same interrupt between
> dom0 and domU?

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