MisterSwiffer

hi all, so far I am using unRAID since more than a year and I am very happy! But now I am facing the first problem that I am not able to solve by myself. My board is an Asrock J3455 with one PCIe slot. I added a dual NIC on this slot that I would like to pass to a VM. But the dual NIC is inside a big IOMMU group: IOMMU group 0: [8086:5af0] 00:00.0 Host bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Host Bridge (rev 0b) IOMMU group 1: [8086:5a85] 00:02.0 VGA compatible controller: Intel Corporation Device 5a85 (rev 0b) IOMMU group 2: [8086:5a98] 00:0e.0 Audio device: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Audio Cluster (rev 0b) IOMMU group 3: [8086:5a9a] 00:0f.0 Communication controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Trusted Execution Engine (rev 0b) IOMMU group 4: [8086:5ae3] 00:12.0 SATA controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series SATA AHCI Controller (rev 0b) IOMMU group 5: [8086:5ad8] 00:13.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #1 (rev fb) [8086:5ad9] 00:13.1 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #2 (rev fb) [8086:5ada] 00:13.2 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #3 (rev fb) [8086:5adb] 00:13.3 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #4 (rev fb) [10ec:8168] 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11) [1b21:0612] 03:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02) [1b21:1182] 04:00.0 PCI bridge: ASMedia Technology Inc. Device 1182 [1b21:1182] 05:03.0 PCI bridge: ASMedia Technology Inc. Device 1182 [1b21:1182] 05:07.0 PCI bridge: ASMedia Technology Inc. Device 1182 [10ec:8168] 06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) [10ec:8168] 07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) IOMMU group 6: [8086:5aa8] 00:15.0 USB controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series USB xHCI (rev 0b) IOMMU group 7: [8086:5ae8] 00:1f.0 ISA bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Low Pin Count Interface (rev 0b) [8086:5ad4] 00:1f.1 SMBus: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series SMBus Controller (rev 0b) dual NIC is in group 5 (06:00.0 and 07:00.0) together with the onboard NIC (01:00.0). Trying to passthrough the hardware using hostdev will not work group 5 is not viable. Please ensure all devices within the IOMMU group are bound to their vfio bus driver So the goal is to split IOMMU groups a little more up. I already tried pcie_acs_override=downstream,multifunction vfio_iommu_type1.allow_unsafe_interrupts=1 But the groups remain the same. Then I did a little research and found these threads: https://www.reddit.com/r/VFIO/comments/61q2k9/asrock_j3455_iommu_groups/ https://www.reddit.com/r/VFIO/comments/63j1p7/any_ideas_why_all_pcie_ports_are_assigned_to_the/ A possible solution seems to modify the kernel a bit. Removing the part pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS``) seems to be a solution for the OP. I tried myself by adding this to the go-file rmmod pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS) But after that the server wont boot. At this moment I am running headless so I first need to get another monitor to see the output while booting. Help would really be appreciated. Thanks. (OT: sorry for the bad english, I am from germany)