[Xen-devel] Re: [PATCH] [x86_emulate] (Almost) complete FPU emul

To:	Andi Kleen <andi@xxxxxxxxxxxxxx>, Trolle Selander <trolle.selander@xxxxxxxxx>
Subject:	[Xen-devel] Re: [PATCH] [x86_emulate] (Almost) complete FPU emulation.
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Tue, 01 Jul 2008 13:21:17 +0100
Cc:	xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 1/7/08 12:56, "Andi Kleen" <andi@xxxxxxxxxxxxxx> wrote:

>> This patch provides emulation for all FPU instructions except fsave/frstore &
>> fnstenv/fldenv.
>> While the main purpose of the patch is to avoid current and future "gotchas"
>> on FPU intructions used by various OS boot-loaders, it is complete enough to
>> run DOS realmode FPU applications and benchmarks, but don't expect to set any
>> speed records.
> 
> What happens when one of these in hypervisor FPU instructions raise
> an exception?

That's accounted for and plumbed correctly.

 -- Keir



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[Xen-devel] Re: [PATCH] [x86_emulate] (Almost) complete FPU emulation.