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

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people.redhat.com/~lersek/ovmf-whitepaper-c770f8c.txt

Windows 7 won't output anything with ovmf until you install the drivers.
I'd recommend either using VGA or using a more modern OS.
On Sep 23, 2015 7:46 AM, "Okky Hendriansyah" <okky at nostratech.com> wrote:

> 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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>
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