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    Customising CPUID

    Scheduled Pinned Locked Moved Compute
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    • T Offline
      ThinkChaos
      last edited by

      Hello,

      I'd like to change the CPUID for a VM. I found the cpuid config option for xl.conf, but don't know where this should be set.
      I'm new to Xen and XCP-ng.

      Could someone point me in the right direction?
      Thanks!

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

        Hi,

        XAPI doesn't work like xl, it's using xe. Can you describe your use case?

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        • T Offline
          ThinkChaos
          last edited by ThinkChaos

          I'm trying to trick the nVidia drivers in Windows for GPU passthrough.

          I tried patching the drivers with sk1080/nvidia-kvm-patcher, but that didn't work for me. So I'm trying to hide the virtualized bit in CPUID.

          Where could I read more about xl vs xe and XAPI?

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

            I assume you mean "consumer grade Nvidia GPUs" for passthrough, because it works out of the box with Quadro GPUs.

            It's far harder than this, see https://lists.xenproject.org/archives/html/xen-devel/2016-07/msg01716.html

            As long we don't know what Nvidia driver is checking exactly, we'll be in the dark to find a way to hide it.

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            • T Offline
              ThinkChaos
              last edited by

              Yeah I'm working with a GTX 960. I guess I'll try something else then. Thanks for the replies.

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

                If you know exactly what's checked in the driver (CPU vendor, ACPI tables, BIOS info, SMI?), we might be able to dig into the right direction. It's just that I won't spend a lot of resources without knowing if our modifications are useful or not.

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