jude Posted February 14, 2015 Share Posted February 14, 2015 I have passthrough working with a single MSI GTX970 GPU on an AMD motherboard (GA990FXA-UD5) with the same AMD CPU. I noticed that your syslinux.cfg file did not have a lot of the AMD specific info that is recommended. This could be part of your problem. my syslinux.cfg file includes the following append amd_iommu=on iommu=pt iommu=1 vfio_iommu_type1.allow_unsafe_interrupts=1 pcie_acs_override=downstream initrd=/bzroot but as always ymmv. Quote Link to comment
Mettbrot Posted February 15, 2015 Share Posted February 15, 2015 Syslinux.cfg 101 The only statement you WILL need in there to ensure clean operations with VFIO is this: pcie_acs_override=downstream Hey! Do I need this for every VM or only if I want to passthrough a GPU? I only want to passthrough USB devices... Quote Link to comment
jonp Posted February 15, 2015 Author Share Posted February 15, 2015 Syslinux.cfg 101 The only statement you WILL need in there to ensure clean operations with VFIO is this: pcie_acs_override=downstream Hey! Do I need this for every VM or only if I want to passthrough a GPU? I only want to passthrough USB devices... That syslinux line is for PCI device pass through. If you are not passing through any PCI devices to any VM, you don't need it. Quote Link to comment
Monkeyair Posted April 23, 2015 Share Posted April 23, 2015 When setting up a VM through the GUI to enable PCI passthrough of tuners, would I need to amend any cfg or go files? I tried to setup a VM to run Ubuntu, but failed to passthrough my devices. Quote Link to comment
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