Re: [Xen-devel] Xen pciback not working: "address space collision: [mem ...] conflicts with System RAM [mem ...]"

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-07-26 at 12:32 +0200, Andrea Brugiolo wrote:
> Good Morning
> 
> I cannot do pciback anymore for both my second scsi controller and my
> second network card: when I try to pass the device to the domU I get
> this error in system logs:
> 
>   ... address space collision: [mem ...] conflicts with System RAM [mem ...]

By eliding the actually addresses you've omitted something which I think
might be interesting:
        [mem 0xf9e00000-0xf9e1ffff 64bit] conflicts with System RAM [mem 
0x00100000-0x4007fffff]

Note that there is not any actual overlap in those two sets of addresses...

Might be that the check is truncating something, or maybe it is
confusing MFN and PFN and so getting a false +ve. Both wild guesses
having not even looked at the code...

> The problem is described here:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717353 and is
> blocking my backup system which is based on a scsi tape changer
> attached to the domU.

What do the guest and host e820 map look like? Actually the full dmesg
for the hypervisor, dom0 and domU kernels would be useful to provide, I
expect.

Ian.

> 
> Thank you very much for your attention
> 
> Andrea
> 
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