Re: Debian kernel doesn't support DomU bit width != Dom0 bit width for PV drivers?

[Ralph Passgang <rp@trust-it.de>]

On 01.02.08 23:40, "James Harper" <james.harper@bendigoit.com.au> wrote:

>>> 
>>> My suspicion then is that the Debian kernel's blkback driver doesn't
> pay
>>> attention to the 'protocol' set by the frontend, even though
> blkfront
>>> driver included in the Debian kernel does actually set it.
>> 
>> Depends what Xen version their kernel / userspace is based on. IIRC
> you
>> need to have at least Xen 3.1.1  to get 32-on-64 working properly -
> the
>> compatability 'protocol' stuff didn't make the original 3.1.0 release
>> 
> 
> I am using 3.1.1, but I think the Debian kernel is 3.1.0 vintage.

Which Debian Kernel?

The 2.6.18-5-xen-686/amd64 kernel is quite old and based on some redhat
kernel patch from around Xen 3.0.x.

It's definitly too old for mixing 64bit and 32bit machines (pv) up.

Please use a newer kernel for both dom0 and domU, if you need help with
that, let me know.
 
> And I was incorrect when I said that blkfront is setting 'x86_NN-abi'.
> That is being done by the xen userspace stuff. It's all making sense
> now!
> 
> Curiously, the HVM stuff works perfectly with the single exception of
> vbd, and only because of the alignment issues in the two related
> structs.
> 
> I think I'll fudge it and release two versions of the PV drivers, one to
> use when Dom0 is 32 bit and one to use when Dom0 is 64 bit.
> 
> James
> 
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