Issues with IOMMU / gpu-passthrough on Proxmox

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   Correction on the BIOS version, here's the correct info: UEFI Version: X470D4U2T P4.10

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matthei Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Aug 2021 Status: Offline Points: 35	Post Options Post Reply Quote matthei Report Post Thanks(0) Quote Reply Topic: Issues with IOMMU / gpu-passthrough on Proxmox Posted: 20 Aug 2021 at 10:11am
	Correction on the BIOS version, here's the correct info: UEFI Version: X470D4U2T P4.10

matthei Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Aug 2021 Status: Offline Points: 35	Post Options Post Reply Quote matthei Report Post Thanks(0) Quote Reply Posted: 20 Aug 2021 at 9:51am
	Using Proxmox hypervisor, trying to get a Windows10 guest OS to have direct GPU access. After following the instructions a few times, I found that there's probably a misconfiguration in the BIOS. My setup: MB: Asrock Rack X470D4U2-2T with bios v 2.20.1276 CPU: Ryzen7Pro 4750G GPU: GeForce GTX 950 From the Proxmox Wiki: https://pve.proxmox.com/wiki/Pci_passthrough Reboot, then run: dmesg \| grep -e DMAR -e IOMMU There should be a line that looks like "DMAR: IOMMU enabled". If there is no output, something is wrong. Well, there's no line that looks like that, so something is wrong. A few bios settings that i've checked or enabled: Advanced -> CPU Configuration -> SVM Mode: enabled Advanced -> AMD CBS -> NBIO Common Options -> IOMMU enabled Advanced -> AMD CBS -> NBIO Common Options -> DMA protection: enabled Advanced -> AMD CBS -> NBIO Common Options -> DMAr Support: enabled While on the subject, it seems that if I enable "DMA Protection" or "DMAr Support", i can no longer enter the bios -- there are 5 beeps during post, and pressing DEL key isn't detected, goes straight to OS. (so i have taken the battery out to clear cmos a few times, to tinker with these settings). I've been searching throughout the internet, trying all sorts of things, for pretty much all of the day. Any ideas what might be wrong? What else can I try?