Enable AMD RX 6600XT Resizable Bar on Unraid 6.12

Enable AMD RX 6600XT Resizable Bar on Unraid 6.12.md

Enable AMD RX 6600XT Resizable Bar on Unraid 6.12

• Add to UserScripts:

  # Change the PCI address and GPU ID accordingly (Unraid GUI -> Tools -> System Devices)
  echo -n "0000:0d:00.0" > /sys/bus/pci/drivers/vfio-pci/unbind
  echo 13 > /sys/bus/pci/devices/0000\:0d\:00.0/resource0_resize
  echo 3 > /sys/bus/pci/devices/0000\:0d\:00.0/resource2_resize
  echo -n "1002 73ff" > /sys/bus/pci/drivers/vfio-pci/new_id || echo -n "0000:0d:00.0" > /sys/bus/pci/drivers/vfio-pci/bind

• Change the top line of XML from the following to the VM's XML:

  <domain type='kvm'>

  to:

  <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

• Add qemu argument (after the </device> line, before the </domain> line):

      <qemu:commandline>
          <qemu:arg value='-fw_cfg'/>
          <qemu:arg value='opt/ovmf/X-PciMmio64Mb,string=65536'/>
      </qemu:commandline>

• Reboot and turn on these settings on BIOS:

  Above 4G Decoding: Enabled
  Resizable BAR: Enabled
  

• Check whether the feature is enabled

  lspci -vvvs "0d:00.0" | grep BAR

  it should output:

          Capabilities: [200 v1] Physical Resizable BAR
              BAR 0: current size: 8GB, supported: 256MB 512MB 1GB 2GB 4GB 8GB
              BAR 2: current size: 8MB, supported: 2MB 4MB 8MB 16MB 32MB 64MB 128MB 256MB