cannot prepare PCI pass-through, IOMMU not present

[StreamerYT]

HUANANZHI X79-16D Dual
Xeon E5 2690 V2


root@pve:~# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
root@pve:~# cat /etc/modules
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

 

[StreamerYT]

Intel VT enabled

 

[leesteken]

What is the output of cat /proc/cmdline? Maybe have a look here to see if you have the same issue?

 

[StreamerYT]

root@pve:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.15.102-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on

 

[leesteken]

root@pve:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.15.102-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on

Then VT-d is not enabled in your motherboard BIOS or not supported by either the motherboard or CPU. Please double check your BIOS and make sure both VT-x (hardware virtualization support) and VT-d (IOMMU support) are enabled.

EDIT: Intel X79 and E5-2690v2 support VT-d. I can only conclude that VT-d is not enabled by the motherboard BIOS.