Dear Xen Users,
    
    I have partial (that is, less than 100%) success following
    Jean David Techer's Xen 4.2-unstable VGA Passthrough Documentation.
    In both Windows 8 Consumer Preview HVM and Windows XP Home Edition
    HVM, I get yellow exclamation mark besides NVIDIA Geforce 8400 GS in
    Device Manager. NVIDIA Geforce 8400 GS in Device Manager reports:
    
    1) Windows has stopped this device because it has reported problems.
    (Code 43)
    2) This device isn't using any resources because it has a problem.
    
    So, in Xen VGA Passthrough to Windows 8 Consumer Preview HVM and
    Windows XP Home Edition HVM, I can only surf the internet and watch
    Youtube videos but I cannot run 3D graphics benchmarks. This is very
    very important because you cannot play 3D games. I can only run 2D
    graphics benchmarks, meaning I can only play 2D games. But nobody
    plays 2D games nowadays.
    
    Jean David Techer, who is French, told me that it is a NVIDIA driver
    problem. According to his documentation, you have to use NVIDIA
    drivers 275.33 and 275.50 strictly. Any other NVIDIA driver versions
    WILL NOT work. Hence, I have attempted to install NVIDIA drivers
    275.33 WHQL and 275.50 BETA in Windows XP Home Edition HVM domU.
    Common sense tells you I did not install both driver versions at the
    same time, of course. Installing NVIDIA driver versions 275.33 and
    275.50 causes Windows XP Home Edition HVM domU to be DESTROYED (in
    Xen speak) and also causes my domain 0 to crash.
    
    But if I install the LATEST NVIDIA drivers above 280.XX, it WILL NOT
    cause my Windows XP HVM domU and domain 0 to crash. But there will
    be a yellow exclamation marks besides NVIDIA Geforce 8400 GS in
    Device Manager. Why do I keep complaining about the yellow
    exclamation mark? Is it because I have nothing better to do and
    irritate David Techer? It is because I simply CANNOT run 3D graphics
    benchmarks and play 3D games. I can only surf the web and play
    Youtube videos.
    
    Jean David Techer's Xen 4.2-unstable VGA Passthrough documentation
    is available at the following URL:
    
    Jean David Techer's Blog link:
http://www.davidgis.fr/blog/index.php?2011/12/07/860-xen-42unstable-patches-for-vga-pass-through
    
    Any Xen user with the following computer hardware specifications,
    please try out David Techer's documentation.
    
    Intel Processor with Virtualization Technology
    Motherboard with VT-d support
    Motherboard BIOS with VT-d option to enable or disable
    NVIDIA PCI Express x16 display card
    
    Any Xen user who can attain 100% success with David Techer's Xen
    4.2-unstable VGA Passthrough documentation, please let all of us at
    xen-users mailing list know. 
    
    Why do I keep on troubleshooting? Because I consider this to be a
    technical challenge, although I am not an expert programmer. I have
    only learnt very basic C programming more than 15 years ago at
    Singapore Polytechnic and I have forgotten most of it by now. I am a
    Linux/UNIX system administrator with experiences in Apache web
    server, qmail and Postfix Email Server, DNS Server, DHCP server,
    OpenLDAP server, phpBB forum, MySQL database, Xen virtualization,
    VirtualBox, VMware, Snort Intrusion Prevention Systems, OSSEC Host
    Intrusion Detection Systems, Nagios monitoring software, and various
    Linux and BSD distributions. But I am by no means a software
    developer. I did not study computer science. I studied mechanical
    engineering at National University of Singapore.
    
    It is too bad software engineer Han Weidong has left Intel
    Corporation last year, otherwise he would be able to help me. I got
    100% success with Xen 3.5-unstable VGA Passthrough 3 years ago, back
    in the year 2009. Han Weidong et al are the original developers of
    the Xen VGA Passthrough patches, which only worked with Xen
    3.5-unstable. Jean David Techer forward ported Han Weidong's patches
    to Xen 4.2-unstable with his programming knowledge, C/C++ and Java.
    I have read his CV.
    
    According to Intel engineers Zhang Xiantao and Ren Yongjie, Intel's
    current policy is to focus on IGD VGA passthrough, so it is
    understood that they won't be able to help me with my issue. It is
    company policy, so they cannot afford the time and resources to help
    me.
    
    If everybody who follows Jean David Techer's Xen 4.2-unstable VGA
    Passthrough documentation with 100% success without glitches, then I
    must be technically incompetent.
    
    I would like to thank Xen users in advance if they are able to lend
    a helping hand.
    
    -- 
Yours sincerely,
Mr. Teo En Ming (Zhang Enming)
Singapore