On Tue, 10 Sep 2019 09:00:44 -0500 Intense Red <intns...@golgotha.net> wrote:
> 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. > Have you enabled SR-IOV in the bios? I would personally trust the kernel output. I also suspect that Xen doesnt allow to PCI passthrough host device right? -- Regards, Nektarios Katakis