strange, after i have to replace my motherboard (old one MSI B450 Tomahawk, new one MSI B450 Tomahawk MAX ) i cant get any output from my guest GPU anymore 
it shows always error code 43 and the amd driver software show me a message that the AMD Driver is not installed or does not work properly.
this is my dmesg output:
[ 1874.346696] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346703] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346708] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346715] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346720] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346727] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346732] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346739] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346744] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346751] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346756] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346763] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346768] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346775] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346785] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346792] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346799] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346805] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346812] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346819] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346825] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346832] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346839] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346846] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346853] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346859] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346866] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1874.346896] vfio-pci 0000:28:00.0: BAR 0: can't reserve [mem 0xd0000000-0xdfffffff 64bit pref]
[ 1943.797100] vfio-pci 0000:28:00.1: refused to change power state from D0 to D3hot
[ 1949.083798] vfio-pci 0000:28:00.1: refused to change power state from D0 to D3hot
[ 1949.083883] vfio-pci 0000:28:00.0: AMD_NAVI10: version 1.1
[ 1949.083883] vfio-pci 0000:28:00.0: AMD_NAVI10: performing pre-reset
[ 1949.083955] vfio-pci 0000:28:00.0: AMD_NAVI10: performing reset
[ 1949.085045] vfio-pci 0000:28:00.0: No more image in the PCI ROM
[ 1949.304722] vfio-pci 0000:28:00.0: AMD_NAVI10: bus reset disabled? yes
[ 1949.304727] vfio-pci 0000:28:00.0: AMD_NAVI10: SMU response reg: 0, sol reg: 0, mp1 intr enabled? no, bl ready? no
[ 1949.304728] vfio-pci 0000:28:00.0: AMD_NAVI10: Clearing scratch regs 6 and 7
[ 1949.304729] vfio-pci 0000:28:00.0: AMD_NAVI10: begin psp mode 1 reset
[ 1949.518353] vfio-pci 0000:28:00.0: AMD_NAVI10: timed out waiting for PSP to reach valid state, but continuing anyway
[ 1950.040432] vfio-pci 0000:28:00.0: AMD_NAVI10: mode1 reset succeeded
[ 1960.773754] vfio-pci 0000:28:00.0: AMD_NAVI10: timed out waiting for PSP bootloader to respond after reset
[ 1960.773760] vfio-pci 0000:28:00.0: AMD_NAVI10: failed to reset device
[ 1960.773761] vfio-pci 0000:28:00.0: AMD_NAVI10: performing post-reset
[ 1960.773851] vfio-pci 0000:28:00.0: AMD_NAVI10: reset result = 0
[ 1960.790420] vfio-pci 0000:28:00.0: refused to change power state from D0 to D3hot