Re: Etherboot problems

[Anthony Liguori <aliguori-NZpS4cJIG2HvQtjrzfazuQ@public.gmane.org>]

Simon Kagstrom wrote:
>> Very likely this is due to VT's inability to virtualize real mode 
>> correctly.  Is anyone in the mood to extend x86_emulate.c to support 
>> real mode?
> 
> I forgot to add that I've tested it in Xen as well, and it works
> there. Maybe someone has an AMD at hand to test it on?
> 
> But I also suspected that this was the reason why it failed. I ran a
> diff between x86_emulate.c in Xen and KVM but couldn't immediately see
> any differences which would explain this.


Xen doesn't use x86_emulate.c for real mode.  It uses vmxassist which 
uses vm86 mode (yes, there are many many emulators in Xen).

Xen 3.0.4 is planning on dropping vmxassist in favor of CPU state hand 
off between QEMU and Xen.  This would be much easier in KVM ATM as it 
doesn't require state synchronization for hardware emulation.

Regards,

Anthony Liguori

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