Re: [Xen-devel] Re: xenpaging fixes for kernel and hypervisor

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 22/09/2010 17:49, "Patrick Colp" <pjcolp@xxxxxxxxx> wrote:

> I don't know if I need to ack or not, but I will:
> 
> Acked-by: Patrick Colp <pjcolp@xxxxxxxxx>
> 
> 
> I think the issue with realmode is in the emulation code. Looking at
> where that crash occurs, it's a result of hvm_emulate_one() returning
> X86EMUL_UNHANDLEABLE. hvm_emulate_one() calls x86_emulate(), and for
> supported functions, that will call hvmemul_* using the
> hvm_emulate_ops pointer function struct. However, my guess is that
> what's causing this problem is an instruction that isn't handled by
> that stuff (the hvmemul_* stuff).

The instruction is dumped as "0f 00 00 00 00 ..." which is a bit unlikely to
be a real instruction. Something went wrong before that point, most likely.

 -- Keir



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