Re: [Xen-devel] Dealing with non-existent BDF devices in VT-d and in the hardware.

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Konrad Rzeszutek Wilk wrote on 2014-03-15:
>> 
>> What happens if you assign the devices under bus 09 to another guest?
> 
> Hadn't tried that. I think it would all blow up as the the
> non-existent bridge is now assigned to one guest and the phantom DMA
> requests for the
> 09 would show up under the 08 device. I think I would corrupt the
> guest memory with random DMA writes.
> 
>> Is it better to add Xen command line to add such devices to a group
>> and
> assign the whole group to a guest when trying to assign a device of
> the group to guest?
> 
> Or implement the group assigment in QEMU or libxl so that nobody tries
> doing it.

But I think user still need to tell which device is buggy manually and I don't 
think QEMU or libxl can do it.

Best regards,
Yang



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