No IOMMU detected

[john335745634]

Hi guys,

Im following the documentation (plus various posts) to make my intel PCI card available however I always get the message:


I got a Lenovo with a I3-4130

I tried with

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt"

and

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"

I actually see something here:

root@pve:~# dmesg | grep -e DMAR -e IOMMU
[    0.040085] DMAR: IOMMU enabled

I also tried to add it here:
nano /etc/kernel/cmdline

quiet intel_iommu=on

nano /etc/modules

vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

this is how the cmdline looks:

root@pve:~#  cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.15.74-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt

root@pve:/var/log# lscpu
Virtualization: VT-x


I see this in the logs:
Mar 9 15:35:35 pve kernel: [ 0.039451] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.15.74-1-pve root=/dev/mapper/pve-root ro quie
t intel_iommu=on iommu=pt
Mar 9 15:35:35 pve kernel: [ 0.039508] DMAR: IOMMU enabled
Mar 9 15:35:35 pve systemd[1]: Reached target NFS client services.
Mar 9 15:35:35 pve kernel: [ 0.039522] Unknown kernel command line parameters "BOOT_IMAGE=/boot/vmlinuz-5.15.74-1-pve", will be pass
ed to user space.
Mar 9 15:35:35 pve apparmor.systemd[607]: Restarting AppArmor
Mar 9 15:35:35 pve kernel: [ 0.040358] Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes, linear)
Mar 9 15:35:35 pve kernel: [ 0.040780] Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear)
Mar 9 15:35:35 pve kernel: [ 0.040821] mem auto-init: stackff, heap allocn, heap freeff
Mar 9 15:35:35 pve apparmor.systemd[607]: Reloading AppArmor profiles
Mar 9 15:35:35 pve kernel: [ 0.088920] Memory: 16028384K/16689512K available (16393K kernel code, 4338K rwdata, 10212K rodata, 3196K
init, 6640K bss, 660868K reserved, 0K cma-reserved)
Mar 9 15:35:35 pve kernel: [ 0.089188] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Mar 9 15:35:35 pve kernel: [ 0.089202] Kernel/User page tables isolation: enabled
Mar 9 15:35:35 pve systemd[1]: Finished Commit Proxmox VE network changes.
Mar 9 15:35:35 pve kernel: [ 0.089216] ftrace: allocating 48262 entries in 189 pages
Mar 9 15:35:35 pve networking[609]: networking: Configuring network interfaces
Mar 9 15:35:35 pve kernel: [ 0.109407] ftrace: allocated 189 pages with 6 groups
Mar 9 15:35:35 pve kernel: [ 0.109518] rcu: Hierarchical RCU implementation.
Mar 9 15:35:35 pve kernel: [ 0.109519] rcu: RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=4.
Mar 9 15:35:35 pve systemd[1]: Finished Create Volatile Files and Directories.
Mar 9 15:35:35 pve kernel: [ 0.109521] Rude variant of Tasks RCU enabled.
Mar 9 15:35:35 pve kernel: [ 0.109521] Tracing variant of Tasks RCU enabled.
Mar 9 15:35:35 pve kernel: [ 0.109522] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
Mar 9 15:35:35 pve systemd[1]: Starting RPC bind portmap service...
Mar 9 15:35:35 pve kernel: [ 0.109523] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
Mar 9 15:35:35 pve kernel: [ 0.113193] NR_IRQS: 524544, nr_irqs: 456, preallocated irqs: 16
Mar 9 15:35:35 pve kernel: [ 0.113398] random: crng init done
Mar 9 15:35:35 pve systemd[1]: Starting Update UTMP about System Boot/Shutdown...
Mar 9 15:35:35 pve kernel: [ 0.113420] Console: colour dummy device 80x25
Mar 9 15:35:35 pve kernel: [ 0.113437] printk: console [tty0] enabled
Mar 9 15:35:35 pve kernel: [ 0.113455] ACPI: Core revision 20210730
Mar 9 15:35:35 pve pvefw-logger[638]: starting pvefw logger
Mar 9 15:35:35 pve kernel: [ 0.113546] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484882848 ns
Mar 9 15:35:35 pve systemd[1]: Finished Update UTMP about System Boot/Shutdown.
Mar 9 15:35:35 pve kernel: [ 0.113561] APIC: Switch to symmetric I/O mode setup
Mar 9 15:35:35 pve kernel: [ 0.113951] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1


What else could I check?

Thanks

John

 

[john335745634]

maybe You need VT-d, not only VT-x to run IOMMU?

 

[leesteken]

I got a Lenovo with a I3-4130

According to Intel, your CPU does not support Directed I/O (VT-d).

What else could I check?

When using an Intel system, make sure both your CPU and motherboard support VT-d and it is enabled in the motherboard BIOS.

Currently, you cannot use IOMMU because your CPU does not support VT-d.

 

[john335745634]

Will IOMMU work with a AMD e-350 AMD-V

 

[leesteken]

Will IOMMU work with a AMD e-350 AMD-V

Only if that CPU and motherboard both also support AMD-Vi, which that 10 year old mobile CPU might not.
AMD Ryzen CPU's and motherboards support IOMMU, but everything except X570 is limited to passthrough of the PCIe lanes connected directly to the CPU.

EDIT: Not all hardware works with IOMMU/passthrough. Try to buy only hardware that someone else has already working with passthrough (on this forum or the internet).