On Sat, Jul 11, 2020 at 09:58:38PM -0500, Bjorn Helgaas wrote: > If BIOS handed off with ATS enabled and we somehow relied on it being > already enabled, something might break if we start disabling ATS. > Just a theoretical possibility, doesn't seem likely to me. I don't think this will be a problem. When the BIOS enables ATS for a device it also needs to enable the IOMMU already, an we are not handling an already enabled IOMMU (outside of kdump kernels) very well. Regards, Joerg
