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

[Avi Kivity]

On 03/23/2012 07:58 PM, Luiz Capitulino wrote:
> On Wed, 21 Mar 2012 15:48:43 +0200
> Avi Kivity <address@hidden> wrote:
>
> > 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.
>
> Can you provide a pointer for this? series?

It's merged (look for emulate_invalid_guest_state in vmx.c), just
incomplete.

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