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Thread: Passthrough and virtuals screen?

  1. #1

    Default Passthrough and virtuals screen?

    I wonder - how do you set up pcie passthrough in such a way that you would get "virtual" monitor?

    I've set up pcie passthrough on KVM / QUEMU successfully. It works great on the additional screen. But there are some productivity cases where it would be beneficial to have a virtual screen. It seems doable - as seen on this video:



    but how? Is it doable thorugh gui (virtual manager)?

  2. #2
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    Default Re: Passthrough and virtuals screen?

    On Tue 24 Oct 2017 01:16:01 PM CDT, Pshemas wrote:

    I wonder - how do you set up pcie passthrough in such a way that you
    would get "virtual" monitor?

    I've set up pcie passthrough on KVM / QUEMU successfully. It works great
    on the additional screen. But there are some productivity cases where it
    would be beneficial to have a virtual screen. It seems doable - as seen
    on this video:


    https://www.youtube.com/watch?v=d3HL9x0CEtY

    but how? Is it doable thorugh gui (virtual manager)?


    Hi
    If I need one on my KVM instances, the that's all I use virtual manager
    (via ssh).

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    Cheers Malcolm °¿° SUSE Knowledge Partner (Linux Counter #276890)
    openSUSE Leap 42.2|GNOME 3.20.2|4.4.87-18.29-default
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  3. #3
    Join Date
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    Default Re: Passthrough and virtuals screen?

    Quote Originally Posted by Pshemas View Post
    pcie passthrough in such a way that you would get "virtual" monitor?
    ... It seems doable - as seen on this video:
    It shows one physical monitor via PCI pass-through and one virtual QEMU monitor.

  4. #4

    Default Re: Passthrough and virtuals screen?

    ok, I see what the person behind linked video did.

    He has 2 video cards in vm - one "passed through" hardware card (Radeon) and one virtual (QXL). Windows does not allow to display the same on both , so only virtual card displays on SPICE window. But the guy installed OBS-Studio and uses it to preview Screen 1 (hardware card) on Screen 2 (virtual card).
    Not exactly what I'm looking for - but close (and clever hack). I'll probably set a remote desktop as a workaround.

  5. #5
    heyjoe NNTP User

    Default Re: Passthrough and virtuals screen?

    Quote Originally Posted by Pshemas View Post
    I've set up pcie passthrough on KVM / QUEMU successfully.
    Could you please provide the steps for this? I have been fighting it for 2 years without success.
    I have only 1 external GPU (GTX680, not supporting uefi-boot) and one inside the CPU (i3770). Running Leap 42.3.

  6. #6

    Default Re: Passthrough and virtuals screen?

    I haven't figured out howto do it with non-uefi video card. I managed to boot one of my old quadro cards, but it failed on VM reboots.

    But with uefi card (gtx 1050) it worked without any hassles. I've basically followed this guide:
    https://forums.opensuse.org/showthre...SuSE-Leap-42-2

    I've tweaked it a bit - but mostly to make sure Nvidia card does not see it is being booted in VM:
    https://forum.level1techs.com/t/play...k-guide/108981

    - Nvidia behaved like a..hole in this regard and if you don't hide VM from the gpu you'll encounter issues on regular, consumer cards (you won't be able to install driver for example).

  7. #7
    heyjoe NNTP User

    Default Re: Passthrough and virtuals screen?

    Thanks for the links. The first one seems to be the same I found here but it doesn't work for me because I have only one discrete video card, so I am trying to make the combination with 1 iGPU + 1 dGPU but unfortunately I am stuck for the moment as you can see in this thread. If I can figure a way to make both GPUs work I could hopefully try to proceed with the steps in that guide.

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