Re: [Qemu-devel] Can VMX provide real mode support?

[Avi Kivity]

On 03/21/2012 03:40 PM, Jan Kiszka wrote:
> On 2012-03-21 13:38, GaoYi wrote:
> > Hi Jan,
> > 
> >     Since the newest Intel-VT supports the guest OS under the real mode, 
> > which was already supported in AMD-V, can the VMX in the latest KVM support 
> > that case?
>
> Yes, both with our without that "unrestricted guest" support (as Intel
> called it), real mode will generally work. Without that CPU feature, I
> think to recall that there were some limitations for big real mode, not
> sure.
>

Yes, big real mode will not work without "unrestricted guest".  There
was some work to emulate it (module option emulate_invalid_guest_state),
but it is not complete.

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