RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA Pass Through to Windows XP Home 32-bit HVM Virtual Machine with Intel Desktop Board DQ45CB

["Han, Weidong" <weidong.han@xxxxxxxxx>]

It's easy to disable emulated VGA, you just add a check in hw/pc.c:
        +    if (gfx_passthru == GFX_NO_PASSTHRU) {
        +       if (cirrus_vga_enabled) {
        ......

That means: if gfx passthroughed, disable emulated VGA.

For another question about loading VGA bios, given you have saved the VGA BIOS 
of your card to vgabios-pt.bin, you should first put it at 
xen-unstable.hg/tools/firmware/vgabios/, and also you needs following changes, 
at last, you still need to pass BDF of gfx to rombios per firmware spec.

diff -r 494be76c1ad9 tools/firmware/hvmloader/Makefile
--- a/tools/firmware/hvmloader/Makefile Thu Aug 27 16:54:33 2009 +0800
+++ b/tools/firmware/hvmloader/Makefile Thu Aug 27 17:22:01 2009 +0800
@@ -50,6 +50,7 @@ roms.h: ../rombios/BIOS-bochs-latest ../
 roms.h: ../rombios/BIOS-bochs-latest ../vgabios/VGABIOS-lgpl-latest.bin \
    ../vgabios/VGABIOS-lgpl-latest.cirrus.bin ../etherboot/eb-roms.h
    sh ./mkhex rombios ../rombios/BIOS-bochs-latest > roms.h
+   sh ./mkhex vgabios_pt ../vgabios/vgabios-pt.bin >> roms.h
    sh ./mkhex vgabios_stdvga ../vgabios/VGABIOS-lgpl-latest.bin >> roms.h
    sh ./mkhex vgabios_cirrusvga \
        ../vgabios/VGABIOS-lgpl-latest.cirrus.bin >> roms.h
diff -r 494be76c1ad9 tools/firmware/hvmloader/hvmloader.c
--- a/tools/firmware/hvmloader/hvmloader.c  Thu Aug 27 16:54:33 2009 +0800
+++ b/tools/firmware/hvmloader/hvmloader.c  Thu Aug 27 17:23:00 2009 +0800
@@ -688,9 +688,9 @@ int main(void)
         vgabios_sz = round_option_rom(sizeof(vgabios_stdvga));
         break;
     case VGA_pt:
-        printf("Loading Gfx Video BIOS from 0xC0000 ...\n");
-        vgabios_sz =
-            round_option_rom((*(uint8_t *)(VGABIOS_PHYSICAL_ADDRESS+2)) * 512);
+         printf("Loading Gfx Video BIOS from file ...\n");
+         memcpy((void *)VGABIOS_PHYSICAL_ADDRESS, vgabios_pt, 
sizeof(vgabios_pt));
+         vgabios_sz = round_option_rom(sizeof(vgabios_pt));
         break;
     default:
         printf("No emulated VGA adaptor ...\n");



Teo En Ming (Zhang Enming) wrote:
> Dear Weidong,
>
> I have read through the technical papers on VGA passthrough presented
> by the University of Amsterdam and the University of Michigan and
> thus gained a better understanding of VGA passthrough in Xen.
>
> For my preferred setup, I would not be able to adopt the guidance
> provided by the University of Amsterdam. I should adopt the guidance
> provided by the University of Michigan. I want dom0 to have access to
> Intel GMA 4500 onboard graphics while the Windows XP Home HVM domU to
> have access to PCI Express x16 graphics.
>
> I have taken the first step in examining the source code for
> disabling the Cirrus emulated vga card bootup in Xen 3.5-unstable.
>
> According to Beng Heng's UMICH technical paper, he referenced source
> file tools/ioemu-remote/hw/pc.c for disabling emulated vga device.
>
> I went to the xen-unstable mercurial reponsitory
> http://xenbits.xensource.com/xen-unstable.hg and found
> tools/ioemu/hw/pc.c
>
> Now, my objective is to disable the emulated/virtual vga card and
> load the bios of my nvidia geforce 8400 gs pcie x16 graphics card.
>
> Source code file
> http://xenbits.xensource.com/xen-unstable.hg?file/18b41609a980/tools/ioemu/h
> w/pc.c
>
> =========================================================================
>
> Line 862 says that if variable cirrus_vga_enabled returns true
> (having a value of 1), the cirrus vga bios VGABIOS_CIRRUS_FILENAME
> will be loaded. Otherwise, an alternative vga bios file
> VGABIOS_FILENAME will be loaded.
>
> On line 30 VGABIOS_FILENAME is defined.
>
> On line 31 VGABIOS_CIRRUS_FILENAME is defined.
>
> On line 24 a header file vl.h is referenced.
>
> Source code file
> http://xenbits.xensource.com/xen-unstable.hg?file/7eefe6399bcd/tools/ioemu/v
> l.h
>
> ===========================================================================
>
> On line 177 the integer variable cirrus_vga_enabled is declared but I
> could not find any line where this variable is initialized to a
> value. But I found file vl.c.
>
> Source code file
> http://xenbits.xensource.com/xen-unstable.hg?file/dade7f0bdc8d/tools/ioemu/v
> l.c
>
> ============================================================================
>
> On line 168 integer variable cirrus_vga_enabled is initialized to a
> value of
> 1. However, I want to disable cirrus vga and load my nvidia geforce
> 8400 gs vga bios.
>
> So I should change line 168 to "int cirrus_vga_enabled = 0;" in my
> case.
>
> Hence line 865 in file pc.c would be executed.
>
> After extracting the vga bios of my nvidia geforce 8400 gs pcie x16
> graphics card using the nvflash.exe utility and saving the firmware
> file as nv-gf-8400-gs.bin, I should place this bios image file in the
> xen-unstable sources directory on my PC. It should be in the same
> directory where files vgabios.bin and vgabios-cirrus.bin are found.
>
> Then I should change line 30 in file pc.c from '#define
> VGABIOS_FILENAME "vgabios.bin"' to '#define VGABIOS_FILENAME
> nv-gf-8400-gs.bin' and then recompile and install the source code.
>
> Besides disabling the emulated cirrus vga card, may I know what other
> things do I need to take care of? Does the pre-existing xen
> 3.5-unstable source code already can take care of re-executing the
> geforce 8400 gs vga bios, passing through the framebuffer and vga I/O
> ports, and intercepting the values in the host bridge such that I do
> not have to hack the other relevant source code files?
>
> Thank you very much.
>
> Regards,
>
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
> BEng(Hons)(Mechanical Engineering)
> Technical Support Engineer
> Information Technology Department
> Asiasoft Online Pte Ltd
> Tampines Central 1 #04-01 Tampines Plaza
> Singapore 529541
> Republic of Singapore
> Mobile: +65-9648-9798
> MSN: teoenming@xxxxxxxxxxx
> Alma Maters: Singapore Polytechnic, National University of Singapore
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Teo En
> Ming (Zhang Enming)
> Sent: Thursday, August 27, 2009 2:03 PM
> To: enming.teo@xxxxxxxxxxxxxxx; weidong.han@xxxxxxxxx;
> djmagee@xxxxxxxxxxxx Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
> PassThrough to Windows XP Home 32-bit HVM Virtual Machine withIntel
> Desktop Board DQ45CB
>
> I think I cannot use NiBiTor already as I don't have any native
> Windows operating system running on my computer.
>
> Instead, I should create a CD-ROM boot disc that contains nvflash.exe
> and also loads USB drivers.
>
> I will use nvflash.exe to extract out and save VGA BIOS to USB sticks.
>
> NVIDIA GeForce BIOS Backup Guide:
> http://www.mvktech.net/content/view/14/37/
>
> Motherboard Flash Boot CD from Linux Mini HOWTO:
> http://www.nenie.org/misc/flashbootcd.html
>
> DOS USB Drivers: http://www.bootdisk.com/usb.htm
>
> Regards,
>
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
> BEng(Hons)(Mechanical Engineering)
> Technical Support Engineer
> Information Technology Department
> Asiasoft Online Pte Ltd
> Tampines Central 1 #04-01 Tampines Plaza
> Singapore 529541
> Republic of Singapore
> Mobile: +65-9648-9798
> MSN: teoenming@xxxxxxxxxxx
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Teo En
> Ming (Zhang Enming)
> Sent: Thursday, August 27, 2009 11:18 AM
> To: weidong.han@xxxxxxxxx; djmagee@xxxxxxxxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
> PassThrough to Windows XP Home 32-bit HVM Virtual Machine withIntel
> Desktop Board DQ45CB
>
> Dear Weidong,
>
> I will go for option 2.
>
>> don't initialize emulated VGA in qemu, I I think you have seen the
>> code.
>
> I have not seen the source code. Though I have learnt simple
> structured C before in Singapore Polytechnic some 11 years ago, I am
> not a programmer by profession. So I would still need some
> instructions on how I can prevent emulated VGA bios from loading and
> getting the vga bios of the real display card to load.
>
> Thank you.
>
> Regards,
>
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
> BEng(Hons)(Mechanical Engineering)
> Technical Support Engineer
> Information Technology Department
> Asiasoft Online Pte Ltd
> Tampines Central 1 #04-01 Tampines Plaza
> Singapore 529541
> Republic of Singapore
> Mobile: +65-9648-9798
> MSN: teoenming@xxxxxxxxxxx
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Han,
> Weidong Sent: Thursday, August 27, 2009 10:01 AM
> To: 'enming.teo@xxxxxxxxxxxxxxx'; 'djmagee@xxxxxxxxxxxx'
> Cc: 'xen-devel@xxxxxxxxxxxxxxxxxxx'
> Subject: RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
> PassThrough to Windows XP Home 32-bit HVM Virtual Machine with
> IntelDesktop Board DQ45CB
>
> Teo En Ming (Zhang Enming) wrote:
>> Hi Weidong,
>>
>> Currently I am using the entire Xen 3.5-unstable branch and not using
>> the posted pci-stub patch changeset 19893 to patch Xen 3.4.1-testing.
>> I am using Xen 3.5-unstable in conjunction with pvops dom 0 kernel
>> 2.6.31-rc6.
>>
>> Here are my questions:
>>
>> 1) How do I extract out the VGA BIOS/firmware from the
>> firmware/EEPROM chip on the Geforce 8400 GS VGA card? If it is not
>> possible to extract, where can I download the firmware? NVIDIA does
>> not provide display card firmware/BIOS files for public download on
>> its website.
>
> There are 3 ways to load VGA bios to guest:
> 1. copy it from host 0xc0000, and map it to guest 0xc0000. This works
> for primary gfx card, XCI does like this. But some VGA bios
> re-execution doesn't work well.
> 2. dump VGA bios to a file first, then load it to guest: you can use
> NiBiTor to dump VGA bios of Nvidia gfx cards to a file, then load it
> into guest roms like what emulated VGA does in hvmloader. This works
> for all gfx cards, but it involves manual steps.
>
> 3. load VGA bios from expansion rom: Intel iGFX doesn't have
> expansion rom
>
>>
>> 2) How do I get the Geforce 8400 GS VGA BIOS to load instead of the
>> emulated VGA BIOS? Which configuration files/source codes do I have
>> to configure/patch?
>
> don't initialize emulated VGA in qemu, I I think you have seen the
> code.
>
>>
>> 3) What are physical MMIO, virtual MMIO Bars, dsdt.asl and 1:1 map? I
>> am sorry but I am not a graphics card hardware engineer so I do not
>> understand those terms. I would appreciate it if you could write out
>> some steps that I could carry out or point me to already available
>> documentation.
>
> When you use command 'lspci -v', you may see below messages under each
> device:
>
> ...
> Memory at d0000000 (32-bit, prefetchable) [size=256M]
> Memory at ff900000 (32-bit, non-prefetchable) [size=1M]
> ...
>
> They are MMIO BARs. 1:1 map means make these MMIO BARs in guest are
> equal to the values in host.
>
>>
>> 4) I don't mind using experimental code. Please post it on the
>> xen-devel mailing list so that I could try it out.
>
> we will post in near future. pls wait for a while.
>
> Regards,
> Weidong
>
>>
>> Thank you very much.
>>
>> Regards,
>>
>> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
>> BEng(Hons)(Mechanical Engineering)
>> Technical Support Engineer
>> Information Technology Department
>> Asiasoft Online Pte Ltd
>> Tampines Central 1 #04-01 Tampines Plaza
>> Singapore 529541
>> Republic of Singapore
>> Mobile: +65-9648-9798
>> MSN: teoenming@xxxxxxxxxxx
>>
>> -----Original Message-----
>> From: Han, Weidong [mailto:weidong.han@xxxxxxxxx]
>> Sent: Wednesday, August 26, 2009 6:56 PM
>> To: 'enming.teo@xxxxxxxxxxxxxxx'; 'djmagee@xxxxxxxxxxxx'
>> Cc: 'xen-devel@xxxxxxxxxxxxxxxxxxx'
>> Subject: RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
>> Pass Through to Windows XP Home 32-bit HVM Virtual Machine with
>> Intel Desktop Board DQ45CB
>>
>> Teo En Ming (Zhang Enming) wrote:
>>> Hi Weidong,
>>>
>>> Could you share with us the hack codes for making Geforce 8400 GS
>>> work and also how to let the Windows HVM guest boot up using the
>>> real BIOS of Geforce 8400 GS instead of an emulated VGA BIOS?
>>>
>>
>> What patch are you using now? Using real VGA bios of gfx card to
>> replace emulatd VGA bios is the prerequisite of gfx passthrough. You
>> can find it in posted gfx passthrough patches or XCI. For hack of
>> making Geforce 8400, we reserve physical MMIO BARs in dsdt.asl, and
>> make it 1:1 map between physical MMIO BARs and virtual MMIO BARs of
>> the card. Currently our code is experimental, we will send out in
>> mailing list after cleanup and more tests.
>>
>> Regards,
>> Weidong
>>
>>> Thank you.
>>>
>>> Regards,
>>>
>>> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
>>> BEng(Hons)(Mechanical Engineering)
>>> Technical Support Engineer
>>> Information Technology Department
>>> Asiasoft Online Pte Ltd
>>> Tampines Central 1 #04-01 Tampines Plaza
>>> Singapore 529541
>>> Republic of Singapore
>>> Mobile: +65-9648-9798
>>> MSN: teoenming@xxxxxxxxxxx
>>> Alma Maters: Singapore Polytechnic, National University of Singapore
>>>
>>> -----Original Message-----
>>> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>>> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Han,
>>> Weidong Sent: Wednesday, August 26, 2009 4:27 PM
>>> To: 'djmagee@xxxxxxxxxxxx'; 'enming.teo@xxxxxxxxxxxxxxx'
>>> Cc: 'xen-devel@xxxxxxxxxxxxxxxxxxx'
>>> Subject: RE: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16
>>> VGAPassThroughto Windows XP Home 32-bit HVM Virtual Machine with
>>> IntelDesktop BoardDQ45CB
>>>
>>> I suppose you just use the patch posted in mailing list before.
>>> nVidia Geforce 8400 passthrough needs extra hacks. We can make it
>>> work in our experiments with 1:1 map of its MMIO BARs.
>>>
>>> We are working on gfx passthrough on latest xen-unstable. Firstly,
>>> we want to cook a simple patch including generic changes to support
>>> passthrough of virtualization friendly gfx cards, such as Nvidia
>>> FX3800. This patch is basically done. Then, we will add some hacks
>>> for more gfx cards passthrough, such as iGFX and some Nvidia and
>>> ATI cards.
>>>
>>> Regards,
>>> Weidong
>>>
>>> djmagee@xxxxxxxxxxxx wrote:
>>>> As I've pointed out on this list before, there are not enough PCIe
>>>> lanes on the DQ45CB to drive both the internal graphics adapter and
>>>> the add-on adapter at the same time.  I believe the onboard one may
>>>> be able to operate in some sort of VGA only mode when there is a
>>>> card installed and used as the primary adapter.
>>>>
>>>> I have a similar setup, using the same motherboard, and an ATI
>>>> 4770. I used the VGA passthrough patches from an earlier posting
>>>> (I saw you followed the same set of instructions), with limited
>>>> success. I've been using 3.4-testing, and 'xenified' 2.6.29.6
>>>> kernel.  I made modifications to the dom0 portion of the patches
>>>> so they would apply to my xenified 2.6.29 kernel.  These patches
>>>> include code that will copy the VGA bios to the guest bios instead
>>>> of using the emulated vga bios.  I've had very little success,
>>>> however.  I have only tried passing through the ATI adapter.  In
>>>> all instances, the guest bios messages appear on my monitor, so
>>>> this much works.  In some cases, the guest essentially stops
>>>> there; xm list show's about 2sec CPU usage and nothing ever
>>>> happens after that point.  In other cases, the guest (win
>>>> xp/vista/7, as well as KNOPPIX 5.3.1 DVD) will boot all the way,
>>>> but in very low res/color mode, and cannot properly initialize the
>>>> video device.  Once or twice, it actually did recognize the device
>>>> and had a reasonable default color/resolution combination.  In all
>>>> cases where the guest actually boots, the system eventually
>>>> freezes.  In some cases, I get endless streams of iommu page
>>>> faults.
>>>>
>>>> I have 8GB ram installed.  In all cases I've limited dom0 memory to
>>>> 2GB.  In all cases, my guest has been assigned 2GB of memory.
>>>>
>>>> I have a dual core e6600.  I've tried allowing dom0 to use both
>>>> cores, offlining one core (using xend dom0_vcpu setting) after
>>>> boot, and restricting dom0 to only one core using the
>>>> dom0_max_vcpus xen hypervisor parameter.  In all of these cases
>>>> I've tried both one and two vcpus for the guest.  My success with
>>>> VGA passthrough seems somewhat random and no combination of cpu
>>>> assignment seems to have any effect.
>>>>
>>>> I have not tried with the 2.6.18-xen kernel as I haven't gotten it
>>>> to boot on my hardware; it can never find my volume group, even if
>>>> I create a initrd with all of the required modules, or build those
>>>> drivers into the kernel.  I have not spent more than maybe a half
>>>> an hour on this problem; I suspect it may have something to do
>>>> with the version of mkinitrd I'm using (from Fedora 9 x64).
>>>>
>>>> If anyone else has any insight or similar experience I'd also love
>>>> to hear it.
>>>>
>>>> Doug Magee
>>>> djmagee@xxxxxxxxxxxx
>>>>
>>>> -----Original Message-----
>>>> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>>>> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Mr. Teo
>>>> En Ming (Zhang Enming) Sent: Tuesday, August 25, 2009 11:57 AM
>>>> To: enming.teo@xxxxxxxxxxxxxxx
>>>> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> Subject: Re: [Xen-devel] nVidia Geforce 8400 GS PCI Express x16 VGA
>>>> PassThroughto Windows XP Home 32-bit HVM Virtual Machine with
>>>> Intel Desktop BoardDQ45CB
>>>>
>>>> I have uninstalled Xen 3.4.1 and installed Xen 3.5-unstable as
>>>> suggested by Weidong.
>>>>
>>>>
>>>> On 08/25/2009 11:47 PM, Mr. Teo En Ming (Zhang Enming) wrote:
>>>>> Dear All,
>>>>>
>>>>> I have managed to do PCI-e VGA passthrough with the open source
>>>>> Xen but the work is still in progress because although Windows XP
>>>>> guest can see the REAL PCI-e x16 graphics card instead of an
>>>>> emulated graphics driver, it cannot be initialized yet.
>>>>>
>>>>> Thanks to Intel Engineer Han Weidong, Pasi Kärkkäinen, Boris
>>>>> Derzhavets, Marc, Caz Yokoyama, and others who have helped me and
>>>>> shared their knowledge with me along the way.
>>>>>
>>>>> System Configuration:
>>>>>
>>>>> Intel Desktop Board DQ45CB with BIOS upgraded to 0093
>>>>> Onboard Intel GMA 4500 Graphics (IGD)
>>>>> nVidia Geforce 8400 GS PCI Express x16 Graphics Card
>>>>>
>>>>> Fedora 11 Linux 64-bit Xen paravirt operations Domain 0 Host
>>>>> Operating System Xen 3.5 Unstable/Development Type 1 Hypervisor
>>>>> Jeremy Fitzhardinge's Xen paravirt-ops domain 0 Kernel 2.6.31-rc6
>>>>> Primary Video Adapter in BIOS: IGD
>>>>>
>>>>> Please see the screenshots and my blog at the link here:
>>>>>
>>>>>
>>>
>>
> http://teo-en-ming-aka-zhang-enming.blogspot.com/2009/08/nvidia-geforce-8400
>>> -gs-pci-express-x16.html
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel
>>>>
>>>> _______________________________________________
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>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel
>>>
>>>
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