XPost: linux.debian.bugs.dist 
 From: u.kleine-koenig@baylibre.com 
  
 Hello, 
  
 On Thu, Sep 11, 2025 at 10:25:59PM +0800, Naunte wrote: 
 > I configured AMD RX-7900XTX GPU passthrough to a KVM virtual machine 
 running 
 Windows 10 on Debian 13.1.0. 
 > 
 > After shutting down the Windows 10 VM, the Linux host kernel reports errors 
 related to vfio_pci and AMD GPU passthrough. 
 > 
 > This causes virt-manager to freeze and become unresponsive; virsh 
 > commands also hang. The GPU fails to reset, and rebooting the host 
 > system often hangs, requiring a forced reboot via hardware reset or 
 > power off. 
  
 Can you please provide a full bootlog? 
  
 Also can you please provide the output of: 
  
  ls -l /sys/devices/pci0000:00/0000:03:00.0/driver 
  
 when run a) before kvm starts, b) while kvm is running and c) after the 
 problem triggered? 
  
 I suspect that somehow there are two different threads that access 
 the hardware: Both vfio_pci and the amdgpu driver. I guess before you 
 start kvm, the amdgpu driver is loaded already. Does it help to 
 blacklist it (i.e. pass 
  
  module_blacklist=amdgpu 
  
 on the kernel commandline and verify using 
  
  lsmod | grep amdgpu 
  
 that the module isn't loaded before kvm is started.) 
  
 Not knowing how pci passthrough works exactly, I'd expect that the host 
 driver is unbound when kvm is started with a passed through pci device. 
 So if the above helps the likely problem is that the amdgpu fails to 
 completely free all resources. 
  
 Does it produce any kernel or shell output if you do: 
  
  echo 0000:03:00.0 > /sys/bus/pci/drivers/amdgpu/unbind 
  echo 0000:03:00.0 > /sys/bus/pci/drivers/amdgpu/bind 
  
 instead of/before starting kvm? 
  
 Best regards 
 Uwe 
  
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