Re: [Xen-devel] Re: [Xen-users] xen on suse 9.3 and software raid

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 May 2005, at 15:28, Gerd Knorr wrote:

> (which is called by raid6_before_mmx, which in turn is called by
> raid6_mmx1_gen_syndrome, both calls not visible in the trace
> because they are inlined).
>
> Ideas how to fix that?  Other than just disabling raid6?  Can
> that code be replaced with xen hypercalls?  fsave & frestore
> are also used btw.  It's all in drivers/md/raid6x86.h
This is a known issue with Xen 2.0, already fixed in unstable (by 
emulating the privileged instructions).
There are three options here:
 1. Live with it. Disable raid6 in Xen 2.0 and wait for upgrade to 
forthcoming Xen 3.0.
 2. Backport some of the privileged-instruction emulation to Xen 2.0.
 3. Patch the raid6x86.h for Xen 2.0 to do hypercalls rather than priv 
instructions.
I think either options 1 or 2 would be best. Backporting the relevant 
bits of the instruction decoder and emulator from the unstable 
repository would not be very difficult, if this is a big show-stopper 
for anyone.
 -- Keir


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