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RE: [Xen-devel] VMX Assist and x86 segment registers

That should be a matter of weeks after we've done the switch over to


Dr. Leendert van Doorn
Senior Manager - Secure Systems and Tools
IBM T.J. Watson Research Center

             "Kamble, Nitin A"                                             
             ntel.com>                                                  To 
                                       Khoa Huynh/Austin/IBM@IBMUS,        
             06/01/2006 10:02          aliguori@xxxxxxxxxxxxxxxxxxxxxxx,   
             PM                        Leendert Van Doorn/Watson/IBM@IBMUS 
                                       "Yu, Wilfred"                       
                                       <wilfred.yu@xxxxxxxxx>, "Nakajima,  
                                       Jun" <jun.nakajima@xxxxxxxxx>,      
                                       "Mallick, Asit K"                   
                                       RE: [Xen-devel] VMX Assist and x86  
                                       segment registers                   

  Before vmxassist we were using Gunnison emulator inside Intel to do
the real mode emulation. We still have that code around.
  I would like to know what is your time line for completing the qemu-dm

Thanks & Regards,
Open Source Technology Center, Intel Corp

>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
>bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Khoa Huynh
>Sent: Wednesday, May 31, 2006 9:20 AM
>To: aliguori@xxxxxxxxxx
>Cc: Randy Thelen; xen-devel@xxxxxxxxxxxxxxxxxxx; xen-devel-
>Subject: Re: [Xen-devel] VMX Assist and x86 segment registers
>aliguori@xxxxxxxxxxxxxxxxxxxxxxx wrote on 05/31/2006 10:07:08 AM:
>> Big real mode is definitely a problem in vm86 mode.  FreeBSD is also
>> notorious for its use of segmentation :-)  I think it has been
>> that a potential solution is to do away with vmxassist entirely and
>> instead use qemu to emulate 16 bit mode (or another emulator if
>> available).  Not sure if anyone is actually working on that yet
>> It seems to be the most promising solution.
>Yes, we are thinking of putting a full instruction emulator into
>qemu-dm and emulating 16-bit stuff in qemu-dm instead of using
>vmxassist (vmxassist will go away).  Leendert van Doorn and I are
>working on this.  Thanks.
>Xen-devel mailing list

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