HELP: PCIe passthrough not working

[PabloUserT38]

Hi,

I'm trying to configure a PCIe passthrough for a tape drive (the iSCSI can't be applied for reasons). I have issues with IOMMU not being activated. I've followed the instructions at https://pve.proxmox.com/wiki/Pci_passthrough to no avail.

My issues arise at these sections:

IOMMU Interrupt Remapping​

I get nothing after issuing the dmesg | grep 'remapping' command.

So I issued the command echo "options vfio_iommu_type1 allow_unsafe_interrupts=1" > /etc/modprobe.d/iommu_unsafe_interrupts.conf and reboot, but it doesn't seem to change anything.

​

Verify IOMMU Isolation​

I guess it's all about the issue at the previous section, but I simply don't find anything inside the /sys/kernel/iommu_groups/ directory.

I added the line pcie_acs_override=downstream to the kernel boot commandline, to no avail.

I'm attaching the output of hwinfo --short and the grub file.

Any help will be highly appreciated.

 

[leesteken]

Please show the output of cat /proc/cmdline. Maybe intel_iommu=on was not applied because Proxmox has two boot loaders? Is VT-d enabled in the motherboard BIOS?

 

[PabloUserT38]

Thanks for your help. VT-d was disabled. I would have swore I had activated it. Sorry for wasting your time.