Re: [Xen-devel] Re: Xen 3.2 and Big Real Mode support?

To:	Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Re: Xen 3.2 and Big Real Mode support?
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Thu, 31 Jan 2008 09:53:51 +0000
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On 31/1/08 09:48, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:

> On 31/1/08 09:42, "Guillaume Thouvenin" <guillaume.thouvenin@xxxxxxxxxxxx>
> wrote:
> 
>> (XEN) realmode.c:545:d1 Failed to emulate insn.
>> (XEN) realmode.c:599:d1 Real-mode emulation failed @ 4004:0000b071: 0f 17 0f
>> 01 17 0f
>> (XEN) domain_crash_sync called from realmode.c:600
>> (XEN) Domain 1 (vcpu#0) crashed on cpu#6:
> 
> The failing instruction is 0F 17, which is MOVHPS. That's an SSE
> instruction, and it's a bit unlikely to be the very first one we would see.
> I may try to repro this later.

A reasonably simple test would be to modify the CPUID emulation intercept in
realmode.c to mask out SSE feature bits.

 -- Keir




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