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    XCP-ng GPU Passthrough - No GPU found

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    • D Offline
      DustinB
      last edited by

      This GPU doesn't appear to be supported, likely some limitation from Citrix that hasn't been worked around.

      0_1534185958463_XenCenterMain_2018-08-13_14-45-39.png 0_1534185962506_chrome_2018-08-13_14-45-48.png

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      • D Offline
        DustinB
        last edited by

        Removing the passthrough GPU, the VM starts without issue.

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        • olivierlambertO Offline
          olivierlambert Vates 🪐 Co-Founder CEO
          last edited by

          Yes, you tried to pass a vGPU, which is different to do a full PCI passthrough.

          Nvidia vGPU is not free sadly. AMD and Intel are, because based on standards (XenGT for Intel and SRIOV for AMD).

          However, PCI passthrough should be universal (ie working for everyone).

          vGPU is vastly different than PCI passthrough. In short, vGPU is passing "slices" of physical GPU to a VM (like vCPU for a physical CPU). This allows to share GPU load between multiple VMs with one physical GPU.

          PCI Passthrough is exclusive, it "reserves" the whole PCI device for one VM.

          D 1 Reply Last reply Reply Quote 2
          • D Offline
            DustinB @olivierlambert
            last edited by

            @olivierlambert said in XCP-ng GPU Passthrough - No GPU found:

            Gotcha, which I was hoping to provide just a slice, but with Nvidia it's a no-go.

            No worries, at least now I know.

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            • olivierlambertO Offline
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              Yeah, we had specific threa instructions to remove the Nvidia/Citrix vGPU thing for XCP-ng because it's not Open Source.

              On Intel side, recent Xeon supports it (but you know Intel graphic perfs lol…) and also AMD FirePro S7150 (16vGPU).

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              • D Offline
                DustinB
                last edited by

                So a rock and a hard place. . . don't get the performance for the money or spend a ton of money. . .

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                • olivierlambertO Offline
                  olivierlambert Vates 🪐 Co-Founder CEO
                  last edited by

                  vGPU is still "reserved" for Virtual Desktop Infrastructure, which is a VERY lucrative and closed source world.

                  tjkreidlT 1 Reply Last reply Reply Quote 1
                  • tjkreidlT Offline
                    tjkreidl Ambassador @olivierlambert
                    last edited by tjkreidl

                    @olivierlambert Indeed. NVIDIA in particular is bent on your having to license any sort of vGPU technology and it would not surprise me to see even passthrough leveraged at some point in the future. There are already restrictions on being able to make use of Quadro features, for example, of you don't have licenses.

                    Also, note that you need one video board reserved to run the native OS (XCP-ng) dom0 instance itself, so the server has to effectovely have at least two graphics boards such that one can be used as a GPU.

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                    • olivierlambertO Offline
                      olivierlambert Vates 🪐 Co-Founder CEO
                      last edited by

                      Yeah, with GRID you need to pay also for the "driver" if I'm correct.

                      AMD approach is far better IMHO (using "standard" SRIOV) but that's because they are probably lagging in the market. Nvidia and Intel have somehow very similar business methods 😛

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                      • olivierlambertO Offline
                        olivierlambert Vates 🪐 Co-Founder CEO
                        last edited by

                        @tjkreidl hmm it's not possible to "remove" the GPU for the dom0? It won't boot without it?

                        tjkreidlT 1 Reply Last reply Reply Quote 0
                        • tjkreidlT Offline
                          tjkreidl Ambassador @olivierlambert
                          last edited by

                          @olivierlambert No, it needs it (some sort of video board is necessary or it won't run at all). It has to at least be able to render the xsconsole interface.

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                          • olivierlambertO Offline
                            olivierlambert Vates 🪐 Co-Founder CEO
                            last edited by

                            Okay good to know 🙂 I had the hope that a serial console would be enough. I'll take a look if I can have any luck.

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                            • M Offline
                              misterpc23
                              last edited by

                              So when will PCI passthrough be available through the GUI for lazy people such as myself? I don't mind dedicating a whole card per VM (Prefer it actually) but am highly hesitant to use the console. Thank you for all of the hard work, XCP-ng is awesome!

                              borzelB 1 Reply Last reply Reply Quote 0
                              • borzelB Offline
                                borzel XCP-ng Center Team @misterpc23
                                last edited by

                                @misterpc23 sometimes even lazy people have to go to the cli 😉

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                                • M Offline
                                  misterpc23 @borzel
                                  last edited by

                                  @borzel It wasn't scary at all! Only downside is my gpu hasn't showed up so I'm thinking it is not supported (R370). Where could I find a list of GPU's that will work with PCI passthrough with XCP-NG? Thank you for any help 🙂

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                                  • I Offline
                                    imtrobin
                                    last edited by

                                    KVM is quite easy to spoof the VM so the nvidia drivers work. Is it possible to do easily for xcp?

                                    https://lists.xenproject.org/archives/html/xen-devel/2016-07/msg01713.html

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                                    • olivierlambertO Offline
                                      olivierlambert Vates 🪐 Co-Founder CEO
                                      last edited by

                                      You can pass the entire GPU if you like, it's no big deal. vGPU is another story.

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                                      • I Offline
                                        imtrobin
                                        last edited by

                                        I'm talking about GPU Passthrough, not vGPU. The GPU is passthrough fine but the nvidia driver results in code 43, meaning the driver detected it is running in a VM.

                                        KVM bypass this by spoofing the VM, and it works, so can XCP do similar?

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                                        • olivierlambertO Offline
                                          olivierlambert Vates 🪐 Co-Founder CEO
                                          last edited by

                                          IDK what it means to spoofing the VM. If you can tell what's needed exactly, maybe we could do something 🙂

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                                          • I Offline
                                            imtrobin
                                            last edited by

                                            In KVM, I need to do these

                                            1. turn on cpu hidden state

                                            https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#"Error_43:_Driver_failed_to_load"_on_Nvidia_GPUs_passed_to_Windows_VMs

                                            1. Assign the gpu to vfio directly (I guess we may not need to do this here)

                                            2. Blacklist the nvidia drivers like this

                                            https://techblog.jeppson.org/2018/03/windows-vm-gtx-1070-gpu-passthrough-proxmox-5/

                                            https://forum.proxmox.com/threads/gpu-passthrough-tutorial-reference.34303/

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