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

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You can run win7 with ovmf, but you need to follow the whitepaper
instructions.
On Sep 23, 2015 11:37 AM, "Okky Hendriansyah" <okky at nostratech.com> wrote:

> Good to hear that. Keep in mind that by enabling the Intel VGA Arbitration
> on the kernel, you lose the DRI capabities (3D acceleration, etc.) on the
> host graphics card (Intel HD).
>
> If you don't want that, the only way is to pass the GPU without VGA
> (legacy-free) mode, thus by using a modern OS like Windows 8 onwards that
> supports UEFI (via OVMF). Using the legacy-free mode we don't need to patch
> the kernel and we don't lose the DRI capabilities of the host (Intel HD
> only). Oh yeah, we also need the GPU to support UEFI.
>
> Alex details this on his blog
> http://vfio.blogspot.co.id/2014/08/whats-deal-with-vga-arbitration.html?m=1
>
> Best regards,
> Okky Hendriansyah
>
> > On Sep 23, 2015, at 14:13, Francisco Menendez <aterfelis at gmail.com>
> wrote:
> >
> > Okky.
> >
> > The arbitration patch did it! Also, by your suggestion, I went back to
> > Seabios instead of OVFM.
> > Thanks a lot! This was driving me crazy for the past week!
> >
> > Kind regards.
> >
> > -Francisco
> >
> >> On Wed, Sep 23, 2015 at 1:45 PM, 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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