[vfio-users] KVM + QEMU + GPU passthrough (Windows7 Guest)

[Okky Hendriansyah]

Hmm, I once successful passing through to a Windows 7 guest but with using VGA mode, thus I used the Seabios instead of OVMF, install linux-vfio from AUR to have the kernel patched with necessary Intel VGA Arbitration patches, and enable the i915.enable_hd_vgaarb=1 kernel parameter.

Here’s my script when I use Windows 7: 
http://pastebin.com/5U2VjuEy

-- 
Okky Hendriansyah
On September 23, 2015 at 11:30:47, Francisco Menendez (aterfelis at gmail.com) wrote:

Hello, Okky.  
Thanks for your reply.  

I removed the x-vga=on option but there isn't any discernible change.  
Boots normally, but only displays up until "Starting Windows"  

On Wed, Sep 23, 2015 at 1:10 PM, Okky Hendriansyah <okky at nostratech.com> wrote:  
> Hi Francisco,  
>  
> It seems that you passthrough in VGA mode (x-vga=on) but you are using OVMF  
> also. Have you tried omiting the x-vga=on switch?  
>  
> Best regards,  
> --  
> Okky Hendriansyah  
>  
> On September 23, 2015 at 11:05:44, Francisco Menendez (aterfelis at gmail.com)  
> wrote:  
>  
> I'm having a bit of an odd issue and would greatly appreciate it if  
> someone has any clue as of what might be happening.  
>  
> The system:  
> * Intel CPU with VTx and VTd enabled in BIOS  
> * NVidia GTX 980 - isolated (vfio), to be used by the guest  
> * Intel graphics for the host (Arch Linux x64)  
>  
> What I've done:  
>  
> * Added "iommu_intel=on" to the kernel boot command line  
> * Blacklisted the nouveau driver  
> * Added the vfio-pci driver and assigned the necessary ids (GPU +  
> attached HDMI sound)  
> * Confirmed IOMMU groups ( /sys/kernel/iommu_groups/ -type l output is OK)  
> * Confirmed vfio-pci capture with dmesg  
>  
> What happens:  
>  
> After booting windows, I get the GPU displaying the "Starting Windows"  
> splash screen, with animation and everything. Thus far, I think the  
> GPU passthrough is successful. However, after that, the screen gets  
> stuck there while the system keeps booting. I even hear the windows  
> chime as it starts, but the screen is still showing "Starting Windows"  
>  
> If I use emulated VGA, the NVidia card shows "Code 12", but I hear  
> this is expected if the emulated VGA is turned on.  
>  
> The above is also reproducible with the windows installer ( The GPU  
> output displays: "Windows is loading files" -> "Starting windows" ->  
> no more screen updates )  
>  
> QEMU commandline:  
>  
> --------------  
> qemu-system-x86_64 \  
> -name windows7 \  
> -cpu host,kvm=off \  
> -smp 8,sockets=1,cores=4,threads=2 \  
> -enable-kvm \  
> -machine type=pc,accel=kvm,iommu=on \  
> -m 16G -mem-prealloc -balloon none \  
> -rtc clock=host,base=utc \  
> -soundhw hda \  
> -device  
> ioh3420,bus=pci.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1  
> \  
> -device vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on  
> \  
> -device vfio-pci,host=01:00.1,bus=root.1,addr=00.1 \  
> -drive  
> if=pflash,format=raw,readonly,file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd  
> \  
> -drive  
> if=pflash,format=raw,file=/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd  
> \  
> -drive file=win7.img,if=ide,format=raw,media=disk \  
> -monitor stdio \  
> -device piix3-usb-uhci -device usb-tablet \  
> -vga none -serial null -parallel null -nodefaults -nodefconfig  
> ----------------  
>  
> Let me know if you need any other information about the setup.  
> Thank you in advance!  
>  
> _______________________________________________  
> vfio-users mailing list  
> vfio-users at redhat.com  
> https://www.redhat.com/mailman/listinfo/vfio-users  
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