A box booting Xen with an updated Debian 10/Buster setup as Xen's dom0, a Ryzen CPU and Radeon-based GPU.
/etc/default/grub has been modified to include: GRUB_CMDLINE_LINUX_DEFAULT="quiet iommu=1 amd_iommu=on" and grub has been updated. After a reboot Xen reports: # xl dmesg | grep IOMMU (XEN) AMD-Vi: IOMMU Extended Features: (XEN) AMD-Vi: IOMMU 0 Enabled. Cool. But GNU/Linux says: # dmesg | grep IOMMU [ 2.536053] AMD IOMMUv2 driver by Joerg Roedel <jroe...@suse.de> [ 2.536054] AMD IOMMUv2 functionality not available on this system WTF?! Can someone whack me with a clue-bat? TIA. -- "It is a damn poor mind indeed which can't think of at least two ways to spell any word." -- US President Andrew Jackson.
