Re: [Xen-devel] Floating Point Exception when compiling w/ gcc

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Feb 2005, at 19:26, Robin Green wrote:

> I found a floating-point bug in xen-unstable, which, since I don't know
> what causes it, might also be present in xen 2.0.4. (See thread
> "reproducable data corruption in xen-unstable".)
>
> HOWEVER, I did create a workaround patch, which effectively solves the
> problem for me. Remember to apply this patch both to xen0 and xenU
> kernels.
I'd like to get to the bottom of this problem. I've checked in some 
cleanups to FPU
code in both -testing and -unstable trees (the cleanups are 
particularly extensive
in the unstable tree). Can you see if the problem still occurs? If it 
does, it would be
useful to see at task-switch time, where you see that TS is incorrectly 
cleared, whether
Xen per-domain flags EDF_GUEST_STTS and EDF_USEDFPU are true or false.
You'll have to hack in a call-down into Xen to print out the flags' 
status -- perhaps
hack into the 'xen_version' hypercall?

 -- Keir



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