Jtdcftul

Ok, so I've been battling with this problem for few weeks now.

I'm currently rocking:

• fx-8320E




• GA-970A-DS3P




• RX-480 4GB

and I've been having a problem with the IOMMU boot.

So, if I try to boot with anything other than the soft mode on iommu in grub, I get stuck on booting, no matter what the amd_iommu setting is set to. iommu=off works fine, but no usb devices are recognised.

Also, I've checked the BIOS and I have enabled SVM and IOMMU for my cpu, and both CPU and the MB support AMD-Vi

If I run dmesg | grep iommu -i I get this output:

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic root=UUID=087205d6-21bf-4c57-87d6-3621a0f04b6c ro iommu=soft

[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic root=UUID=087205d6-21bf-4c57-87d6-3621a0f04b6c ro iommu=soft

[    5.003506] AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>

[    5.003507] AMD IOMMUv2 functionality not available on this system

I'm assuming that it's saying that functionality is not available because I'm not running the motherboard iommu, but the software one.

So, I'd like to know if there's anything else I can try or check to fix this "problem" and maybe get a Windows VM running with GPU passthrough.

Thanks in advance.

EDIT

When running virt-host-validate I receive this output:

  QEMU: Checking for hardware virtualization                                 : PASS

  QEMU: Checking if device /dev/kvm exists                                   : PASS

  QEMU: Checking if device /dev/kvm is accessible                            : PASS

  QEMU: Checking if device /dev/vhost-net exists                             : PASS

  QEMU: Checking if device /dev/net/tun exists                               : PASS

  QEMU: Checking for cgroup 'memory' controller support                      : PASS

  QEMU: Checking for cgroup 'memory' controller mount-point                  : PASS

  QEMU: Checking for cgroup 'cpu' controller support                         : PASS

  QEMU: Checking for cgroup 'cpu' controller mount-point                     : PASS

  QEMU: Checking for cgroup 'cpuacct' controller support                     : PASS

  QEMU: Checking for cgroup 'cpuacct' controller mount-point                 : PASS

  QEMU: Checking for cgroup 'cpuset' controller support                      : PASS

  QEMU: Checking for cgroup 'cpuset' controller mount-point                  : PASS

  QEMU: Checking for cgroup 'devices' controller support                     : PASS

  QEMU: Checking for cgroup 'devices' controller mount-point                 : PASS

  QEMU: Checking for cgroup 'blkio' controller support                       : PASS

  QEMU: Checking for cgroup 'blkio' controller mount-point                   : PASS

  QEMU: Checking for device assignment IOMMU support                         : PASS

  QEMU: Checking if IOMMU is enabled by kernel                               : WARN (IOMMU appears to be disabled in kernel. Add iommu=pt iommu=1 to kernel cmdline arguments)

   LXC: Checking for Linux >= 2.6.26                                         : PASS

   LXC: Checking for namespace ipc                                           : PASS

   LXC: Checking for namespace mnt                                           : PASS

   LXC: Checking for namespace pid                                           : PASS

   LXC: Checking for namespace uts                                           : PASS

   LXC: Checking for namespace net                                           : PASS

   LXC: Checking for namespace user                                          : PASS

   LXC: Checking for cgroup 'memory' controller support                      : PASS

   LXC: Checking for cgroup 'memory' controller mount-point                  : PASS

   LXC: Checking for cgroup 'cpu' controller support                         : PASS

   LXC: Checking for cgroup 'cpu' controller mount-point                     : PASS

   LXC: Checking for cgroup 'cpuacct' controller support                     : PASS

   LXC: Checking for cgroup 'cpuacct' controller mount-point                 : PASS

   LXC: Checking for cgroup 'cpuset' controller support                      : PASS

   LXC: Checking for cgroup 'cpuset' controller mount-point                  : PASS

   LXC: Checking for cgroup 'devices' controller support                     : PASS

   LXC: Checking for cgroup 'devices' controller mount-point                 : PASS

   LXC: Checking for cgroup 'blkio' controller support                       : PASS

   LXC: Checking for cgroup 'blkio' controller mount-point                   : PASS

   LXC: Checking if device /sys/fs/fuse/connections exists                   : PASS

and the problem is that the iommu=pt iommu=1 don't work for me, as they don't seem to boot.