[Xen-devel] Re: [PATCH] [RFC] More fp instructions for realmode emulation (Enables booting OS/2 as a HVM guest on Intel/VT hardware)

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

Keir Fraser <keir.fraser@xxxxxxxxxxxxx> writes:

> Intel SDM Volume 1 Section 8.6 (?X87 FPU Exception Synchronization?) is very
> helpful in this regard. It confirms my suspicions, that we will need to wrap
> the FPU inline asms in some fixup glue. The only exceptions to this rule are

Yes you definitely need to. That was a kernel crash bug on native Linux
some time ago...

Also you need to do the same for any FXSAVEs/FXRSTORs if you haven't already.

-Andi


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