On Tue, Jun 30, 2020 at 11:33:10AM +0800, Yalan Zhang wrote: > Hi, > > Since long time ago, to enable the SR-IOV VF pci passthrough function, I'm > always adding "amd_iommu=on" into kernel cmdline on AMD system. > But recently I found even I do not do this action, IOMMU is still enabled > by kernel on AMD system. I don't know history of amd_iommu=on, but currently libvirt's official recommendation for AMD hosts, via virt-host-validate is iommu=pt iommu=1 Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
