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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 3/3/08 14:52, "Andi Kleen" <andi@xxxxxxxxxxxxxx> wrote:

>> 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.

FXSAVE/FXRSTOR do not flush pending FPU exceptions, right?

 -- Keir



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