Adaptec 4port tulip card - IRQ-Sharing dom0/domU

Adaptec 4port tulip card - IRQ-Sharing dom0/domU

[Stefan Neuwirth]

Hello,

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?

If have a working setup with two independent tulip based ethernet
cards for domU and the 4port card in dom0 and vice versa - the only
thing that is not working is the sharing of the 4port card between
dom0 and domU :-(

Regards
  Stefan

Re: Adaptec 4port tulip card - IRQ-Sharing dom0/domU

[Keir Fraser]

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@trillian.hd.shuttle.de> 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?