PCIe ACS override question

[repomanz]

New to unraid and a bit uneasy with this patch.   Do you see anything here that would become problematic if i change the PCIe ACS override to downstream?  I would like to pass through the gpu and sound to my linux and windows VMs.

IOMMU group 0:[8086:191f] 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 07)

IOMMU group 1:[8086:1901] 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 07)

[8086:1905] 00:01.1 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x8) (rev 07)

[10de:11c0] 01:00.0 VGA compatible controller: NVIDIA Corporation GK106 [GeForce GTX 660] (rev a1)

[10de:0e0b] 01:00.1 Audio device: NVIDIA Corporation GK106 HDMI Audio Controller (rev a1)

[1000:0072] 02:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03)

IOMMU group 2:[8086:1912] 00:02.0 Display controller: Intel Corporation HD Graphics 530 (rev 06)

IOMMU group 3:[8086:a12f] 00:14.0 USB controller: Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller (rev 31)

[8086:a131] 00:14.2 Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Thermal Subsystem (rev 31)

IOMMU group 4:[8086:a13a] 00:16.0 Communication controller: Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (rev 31)

IOMMU group 5:[8086:a102] 00:17.0 SATA controller: Intel Corporation Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode] (rev 31)

IOMMU group 6:[8086:a167] 00:1b.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #17 (rev f1)

IOMMU group 7:[8086:a110] 00:1c.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #1 (rev f1)

IOMMU group 8:[8086:a112] 00:1c.2 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #3 (rev f1)

IOMMU group 9:[8086:a118] 00:1d.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #9 (rev f1)

IOMMU group 10:[8086:a11f] 00:1d.7 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #16 (rev f1)

IOMMU group 11:[8086:a145] 00:1f.0 ISA bridge: Intel Corporation Z170 Chipset LPC/eSPI Controller (rev 31)

[8086:a121] 00:1f.2 Memory controller: Intel Corporation 100 Series/C230 Series Chipset Family Power Management Controller (rev 31)

[8086:a170] 00:1f.3 Audio device: Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller (rev 31)

[8086:a123] 00:1f.4 SMBus: Intel Corporation 100 Series/C230 Series Chipset Family SMBus (rev 31)

IOMMU group 12:[8086:15b8] 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V (rev 31)

IOMMU group 13:[1b21:1242] 05:00.0 USB controller: ASMedia Technology Inc. ASM1142 USB 3.1 Host Controller

 

[1812]

I use the patch and have used it on several machines without issues.

 

that said, your mileage may vary.