Re: [Xen-devel] xen crash related to pci passthrough

[Alex Zeffertt <alex.zeffertt@xxxxxxxxxxxxx>]

This is only tangentially related, but...

In xen/arch/x86/irq.c:__pirq_guest_unbind() this code looks wrong to me:

    memmove(&action->guest[i], &action->guest[i+1], IRQ_MAX_GUESTS-i-1);

Should it be:

    memmove(&action->guest[i], &action->guest[i+1], 
sizeof(action->guest[0])*(IRQ_MAX_GUESTS-i-1));

?

Regards,

Alex


On 27/05/10 22:02, Jeremy Fitzhardinge wrote:
> On 05/27/2010 01:02 PM, Keir Fraser wrote:
> > On 27/05/2010 20:51, "Jeremy Fitzhardinge"<jeremy@xxxxxxxx>  wrote:
> >
> >
> > >     3. attach device to PV domU
> > >        dom0# xl pci-attach f13pv64 0000:03:00.0
> > >     4. unbind from pciback
> > >        dom0# echo 0000:03:00.0>  /sys/bus/pci/drivers/pciback/unbind
> > >     5. rmmod driver in domU
> > >        domU# rmmod e1000e
> > >     6. Crash!
> > >
> > > The device in question is an Intel 82574L ethernet controller, using
> > > msi-x interrupts.
> > What happens if you pci-detach before unbinding from pciback? Not that Xen
> > should crash of course, but a crash resulting from a mistake in detach
> > ordring in dom0 would be less worrying than some alternatives.
> Doing things in a more sensible order (rmmod in domU, detach, unbind)
> seems to work OK.  I was deliberately seeing what would happen if I
> tried pulling the device out from under a domain.
>
>      J
>
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