linux-kernel - Re: amdgpu driver rebinding broken by "drm/amd: Clean up kfd node on surprise disconnect"

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Message-ID: <eeef2b2e-6b64-43ec-924a-e4d0c9b9bba8@amd.com>
Date: Thu, 5 Feb 2026 11:48:34 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Cal Peake <cp@...olutedigital.net>,
 Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Mario Limonciello <superm1@...nel.org>,
 Kent Russell <kent.russell@....com>, Alex Deucher <alexander.deucher@....com>
Subject: Re: amdgpu driver rebinding broken by "drm/amd: Clean up kfd node on
 surprise disconnect"

On 2/3/26 4:27 PM, Cal Peake wrote:
> Hi,
> 
> The recent commit 28695ca09d32: "drm/amd: Clean up kfd node on surprise
> disconnect," has broken something with my VMs utilizing PCI passthrough.
> Before launching the VM, I unbind a secondary Radeon GPU from the amdgpu
> driver and then to the vfio-pci driver.
> 
> Previously, everything would just work and I'd get the following kernel
> output:
> 
>    amdgpu 0000:14:00.0: amdgpu: amdgpu: finishing device.
>    [drm] amdgpu: ttm finalized
>    vfio-pci 0000:14:00.0: vgaarb: VGA decodes changed: olddecodes=none,decodes=io+mem:owns=none
>    vfio-pci 0000:14:00.1: enabling device (0000 -> 0002)
>    vfio-pci 0000:14:00.3: enabling device (0000 -> 0002)
> 
> However, now when doing the rebinding: the host display (a different
> Radeon GPU) will freeze up and after a short time, the system will reset
> (thanks to a watchdog I believe) and I get this in the kernel log:
> 
>    amdgpu 0000:14:00.0: amdgpu: amdgpu: finishing device.
>    vfio-pci 0000:14:00.1: Unable to change power state from D3hot to D0, device inaccessible
>    vfio-pci 0000:14:00.3: Unable to change power state from D3hot to D0, device inaccessible
>    vfio-pci 0000:14:00.2: Unable to change power state from D3hot to D0, device inaccessible
> 
> 
> Indeed, backing out the commit from kernels 6.12.67, 6.12.68, and 6.18.8
> gets things back to working.
> 
> Please let me know if you have any ideas or if there is anymore debugging
> info I can provide.
> 
> Thanks,
> 

Here's a solution:
https://lore.kernel.org/amd-gfx/20260205164254.4091912-1-mario.limonciello@amd.com/