NIC Pcie crash

[jhmc93]

Hello,
every time I try to passthrough my nic on proxmox via pcie passthrough it crashes my system, is there a reason for this?

 

[Dunuin]

Hello,
every time I try to passthrough my nic on proxmox via pcie passthrough it crashes my system, is there a reason for this?

Did you check the IOMMU groups? You can't passthrough individual devices, you always passthough a whole IOMMU group. I would bet that your NIC is sharing a IOMMU group with other onboard devices like the memory controller, storage controller and so on. So when trying to passthrough your NIC you also remove other hardware from the host that the host actually needs to operate.

When using consumer hardware usually all onboard stuff attached to the chipset is sharing a single IOMMU group, so that only stuff in the PCIe 16x slots can be passed through.
Whats the output of this?
for d in /sys/kernel/iommu_groups/*/devices/*; do n=${d#*/iommu_groups/*}; n=${n%%/*}; printf 'IOMMU Group %s ' "$n"; lspci -nns "${d##*/}"; done;

 

[jhmc93]

Did you check the IOMMU groups? You can't passthrough individual devices, you always passthough a whole IOMMU group. I would bet that your NIC is sharing a IOMMU group with other onboard devices like the memory controller, storage controller and so on. So when trying to passthrough your NIC you also remove other hardware from the host that the host actually needs to operate.

When using consumer hardware usually all onboard stuff attached to the chipset is sharing a single IOMMU group, so that only stuff in the PCIe 16x slots can be passed through.
Whats the output of this?
for d in /sys/kernel/iommu_groups/*/devices/*; do n=${d#*/iommu_groups/*}; n=${n%%/*}; printf 'IOMMU Group %s ' "$n"; lspci -nns "${d##*/}"; done;

 

[Dunuin]

So there are 3x Intel NICs that are part of IOMMU group 14 and part of the same group are a SATA controller and USB controllers.
So if you passthrough any of those three Intel NICs you also passthrough those USB controllers and the SATA Controller with all disks attached to it.

 

[jhmc93]

so cant do a vm with just the nic passed through