1 message in com.xensource.lists.xen-devel[Xen-devel] Re: [PATCH] [x86_emulate]...
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Keir Fraser01 Jul 2008 05:20 
Subject:[Xen-devel] Re: [PATCH] [x86_emulate] (Almost) complete FPU emulation.
From:Keir Fraser (keir@eu.citrix.com)
Date:07/01/2008 05:20:54 AM
List:com.xensource.lists.xen-devel

On 1/7/08 12:56, "Andi Kleen" <an@firstfloor.org> 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