xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 02/19/2010 12:49:40 PM:
> 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...
Actually, I just verified that that patch makes the note_interrupt()
gutting unnecessary. With just that one line changed, I'm up and running
perfectly.
-Mike
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