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xen-users
[Xen-devel] Re: [Xen-users] xen on suse 9.3 and software raid
[ adding xen-devel to Cc: ]
> Just loading the raid6 module in a xen domain makes my
> machine oops, log below. I'd guess it's because the
> module attempts to use mmx within the kernel, which is
> a bit tricky because you have to save/restore userspace
> fp state for that. Could be a corner case which simply
> doesn't work with xen.
Confirmed, the faulting instruction is a attempt to access
cr0, right here:
static inline unsigned long raid6_get_fpu(void)
{
unsigned long cr0;
preempt_disable();
asm volatile("mov %%cr0,%0 ; clts" : "=r" (cr0));
return cr0;
}
(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
Gerd
--
-mm seems unusually stable at present.
-- akpm about 2.6.12-rc3-mm3
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