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No luck. Iommu just refuses to start for some reason. I use grub config for boot options and it works for sure. But all that i can see in dmesg that iommu enabled but not something like 'Virtualization technology for directed I/O' as it should be. Tried everything bios-related also.

No luck because iommu itself doesn't start properly

Ok,something i found here Output of that check command: root@homelab:~# lspci -nn | grep -qE '8086:(340[36].*rev 13|3405.*rev (12|13|22))' && echo "Interrupt remapping is broken" Interrupt remapping is broken Looks i have one of that faulty chipsets so interrupt remapping doesn`t work...

It appears to be some hp bios issue. Seems this patch is to deal with RMRR issue but seems i don`t exactly have any issues with it. root@homelab:~# dmesg | grep RMRR [ 2.194008] DMAR: RMRR base: 0x000000c77fb000 end: 0x000000c77fdfff [ 2.194013] DMAR: RMRR base: 0x000000c77f4000 end...

I have HP ProLiant se1220 board with xeon x5670 cpus. All virtualization options enabled in bios and ve configured by tutorial. Here some terminal outputs i got root@homelab:~# cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-5.11.22-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt...