VFIO / Intel ARC Passthrough Issue

Currently passing through an Intel ARC A380 (primary GPU) to a VM.
Passthrough itself works fine, the VM starts and runs without issues, unraid perfectly fine after loosing GPU.

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Problem (on VM shutdown)

After stopping the VM, the following error appears:

vfio-pci 0000:08:00.0: not ready 678ms after FLR; waiting
...
vfio-pci 0000:08:00.0: not ready 65535ms after FLR; giving up

Device layout:

• 08:00.0 → GPU

• 09:00.0 → Audio

After this:

• PCIe subsystem becomes unstable (“PCIe basically dies”)

• Unraid is left in a bad state, unable to shutdown.

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Current behavior

• Only way to recover: full power cycle

• A simple reboot is not enough, the GPU does not come back

• System behaves like the PCIe bus is stuck after failed FLR

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Question

Is there a way to prevent vfio-pci from issuing an FLR (Function Level Reset) when the VM shuts down?

I understand this may prevent restarting the VM without a reboot, but that’s acceptable. I want to avoid the risk of having unclean shutdowns, and parity checks every time.
Avoiding the broken PCIe state is more important than VM restart capability.

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What’s been tried

• VFIO hooks → ineffective (reset happens before stop hook run, or at least, it seems)

Current startup

vfio-pci.ids=8086:56a5,8086:4f92 video=efifb:off video=simpledrm:off video=vesafb:off pcie=noaer pcie_acs_override=downstream,multifunction isolcpus=8-15,24-31

also blacklisted i915 from modprobe.

BTW, Unraid and the VM both run perfectly. However, shutting down either the VM or the system consistently results in an unclean shutdown, requiring a manual power-off.

Adding this two topics, might be related to the same issue:

https://forums.unraid.net/topic/188403-passthrough-of-arc-a380-to-windows-11-vm/#findComment-1593728