Guide on how to setup ASMedia 1166 Passthrough in Proxmox

asmedia_1166_proxmox_passthrough.md

Guide: Setting Up ASMedia 1166 on Proxmox

To flash the controller with the correct firmware, you must have access to a Windows machine.

⚠️ Do NOT use version 241224-0000-00!

With this version, starting the VM in Proxmox will hang indefinitely. The VM start command never completes, and you're forced to hard reset the Proxmox host. This is also the version reporting 32 SATA Devices instead of 6.

---

Firmware

Download and flash this firmware version: 211108-0000-00 (archived version). Other might work as well, but this is the one I'm using.

My System:

• AMD Ryzen Pro 5655G
• GIGABYTE B550I AORUS PRO AX

Kernel Parameters

If Proxmox is installed using ZFS:

Edit /etc/kernel/cmdline and append the following parameter:

iommu=pt

If installed using LVM/ext4:

Edit /etc/default/grub and add it inside the GRUB_CMDLINE_LINUX line:

GRUB_CMDLINE_LINUX="... iommu=pt"

---

Check IOMMU Groups

Run the following to list your IOMMU groups:

shopt -s nullglob
for g in $(find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V); do
  echo "IOMMU Group ${g##*/}:"
  for d in $g/devices/*; do
    echo -e "\t$(lspci -nns ${d##*/})"
  done
done

If your ASMedia 1166 controller shares an IOMMU group with other devices, add this parameter as well:

pcie_acs_override=downstream,multifunction

Add it to /etc/kernel/cmdline or /etc/default/grub, depending on your setup.

---

Load Required Modules

Edit /etc/modules and add the following lines:

vfio
vfio_iommu_type1
vfio_pci

---

Blacklist AHCI for ASM1166

Create /etc/modprobe.d/ahci-blacklist.conf with the following content:

options vfio-pci ids=1b21:1166
softdep ahci pre: vfio-pci

---

Rebuild Initramfs

Run:

update-initramfs -u -k all

Then reboot your system.

---

Verify the config

After reboot, run:

lspci -nnk | grep -A 3 ASM1166

You should see something like:

03:00.0 SATA controller [0106]: ASMedia Technology Inc. ASM1166 Serial ATA Controller [1b21:1166] (rev 02)
    Subsystem: ZyDAS Technology Corp. ASM1166 Serial ATA Controller [2116:2116]
    Kernel driver in use: vfio-pci
    Kernel modules: ahci

The line Kernel driver in use: vfio-pci confirms that the controller is bound correctly.

---

Add Device to VM

Now, you can add the ASM1166 controller to your VM under Hardware -> Add -> PCI Device in the Proxmox UI.

asmedia_sata_firmware(station-drivers.com).zip

I used BIOS

Yeah, from my testing, UEFI VM hang with the controller passthrough. Does your VM boot quickly or does it take time (notably on the bios screen) ?

Boots as fast as with no passthrough.

Mine take a long time to boot when using PCIE passthrough. I hoped it was due a firmware problem but I am on 221118006b00 with no problem for PCIe passthrough.

Yeah, from my testing, UEFI VM hang with the controller passthrough. Does your VM boot quickly or does it take time (notably on the bios screen) ?

If your vm hangs when using pve 9 try disabling ROM-Bar for the PCI Device in vm settings (it's hidden under advanced checkbox)

EDIT: It does work (but I too have a delay at the bios screen - maybe 40 seconds) . My Problem seems to come from the fact I am attaching 2 ASM1166 on a PCIe Bifurcation Board.

--------------- Original Comment ------

Does not work for me. I can start the VM once but it does not see any disks. If I shut the vm down and try to start it again it can not start anymore :

error writing '1' to '/sys/bus/pci/devices/0000:0a:00.0/reset': Inappropriate ioctl for device
failed to reset PCI device '0000:0a:00.0', but trying to continue as not all devices need a reset
error writing '1' to '/sys/bus/pci/devices/0000:09:00.0/reset': Inappropriate ioctl for device
failed to reset PCI device '0000:09:00.0', but trying to continue as not all devices need a reset
kvm: ../hw/pci/pci.c:1803: pci_irq_handler: Assertion `0 <= irq_num && irq_num < PCI_NUM_PINS' failed.
TASK ERROR: start failed: QEMU exited with code 1

Yeah, from my testing, UEFI VM hang with the controller passthrough. Does your VM boot quickly or does it take time (notably on the bios screen) ?

If your vm hangs when using pve 9 try disabling ROM-Bar for the PCI Device in vm settings (it's hidden under advanced checkbox)

Sorry for not replying sooner but it doesn't change, it still take a long time on the bios screen. (Also I use incus, which use qemu in the backend so no big change compared to proxmox)

Came here to say: you are the GOAT my man! Spent hours to get that stupid passthrough working and was finally able to it with your guide. Thanks a lot!

I've flashed "241224-0000-00" on my ASM1064, that I've pass-through to TrueNAS VM in Proxmox - works just fine (without anything that you had to set - I've only set pcie_aspm=off for ASPM errors).