Re: [Xen-devel] PCI passthrough w/ shared IRQ in xen/master

[Michael D Labriola <mlabriol@xxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 02/19/2010 12:07:08 PM:

> On Fri, Feb 19, 2010 at 10:56:08AM -0500, Michael D Labriola wrote:
> > I cannot pass a PCI card w/ a shared IRQ to a domU.
> > 
> > If my PCI card is in a different slot, and gets a different IRQ, it 
works. 
> >  But in this one particular slot, it gets an IRQ that's shared with a 
> > bunch of other bits of gear (USB, firewire, and ATA controller).  With 
the 
> > shared IRQ, not only can I not pass the card to my domU, my dom0 
freaks 
> > and dies as well...
> > 
> > Both my dom0 and domU are using the latest xen/master pv_ops kernel 
and 
> > I'm using Xen 3.4.2 (for now).  My domU is a pv domain.
> 
> There is a missing patch that I haven't pushed in the pcifront branch:
> 
> diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
> index e138053..923de2e 100644
> --- a/arch/x86/pci/xen.c
> +++ b/arch/x86/pci/xen.c
> @@ -25,7 +25,7 @@ static int xen_pcifront_enable_irq(struct pci_dev 
*dev)
>     if (dev->irq < 0)
>        return -EINVAL;
> 
> -   rc = xen_allocate_pirq(dev->irq, 0, "pcifront");
> +   rc = xen_allocate_pirq(dev->irq, 1 /* share */, "pcifront");
>     if (rc < 0) {
>        dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
>            dev->irq, rc);
> 
> 


HA!  That's an important one-line diff!  Now my ATM card works w/ shared 
IRQ on domU.  :-)

Now we just have to get a better fix for dom0 than commenting out the 
entire note_interrupt() function...

-Mike


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel