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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] xen crash related to pci passthrough
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 27 May 2010 14:02:20 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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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.


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