>> This patch adds a new boot option to the pci kernel parameter called >> "acs_disable" that will disable ACS. This is useful for PCI peer to >> peer communication but can cause problems when IOVA isolation is >> required and an IOMMU is enabled. Use with care. > Eww. Thanks for the feedback Christoph. My sentiments exactly ;-). > Can we please add smbios quirks for the systems where you've > observed this? I can look at doing this. The issue with this approach is that it will require a kernel patch for each new system that is detected. > we probably also want to keep the option just in case). Agreed. At least then operators have a path to ACS disable prior to a quirk being accepted. Stephen
