September 23, 20232 yr hi guys, i update my graphics driver on My VM, and when rebooting windows was flashing, i couldn't get into uninstall/roll back the driver. i use "GitHub - danioj/unraid-autovmbackup: automatically backup kvm virtual machines and configuration" to do a weekly back up of my system so i thought easy way out just restore last weeks back up. I copied last weeks Vdisk image to the folder - (renamed the V-disk as it have a date stamp) and started the VM. the screens are black and not coming on. i restarted the VM and removed the pass through graphics card. and the system boots fine into VNC. however re-adding the graphics card (AMD) produced the following error in the logs. 2023-09-23T22:14:51.260475Z qemu-system-x86_64: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=7, start=0xc804300000000000, size=0x200000000: Invalid argument kvm_set_phys_mem: error registering slot: Invalid argument googling tells me If you get this crash after booting macOS in KVM with AMD GPU passthrough you'll need to disable Above 4GB decoding on your BIOS/UEFI Setup although its not a macOS i'm booting into i thought that this might help me When i boot into the bios i dont see an option for this... Anyone able to offer any help please. thanks in advance.
October 3, 20232 yr Author Solution If anyone else has this issue, in the end i rebuilt the VM and pointed it to the vdisk, and it booted up fine, got the erropr once more but a restart of the server fixed the issue for me, so unsure which actually fixed it or a combination of both.
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