amdgpu vs kexec

[Christian König]

Hi Peter,

On 6/16/25 11:39, Peter Zijlstra wrote:
> Hi guys,
> 
> My (Intel Sapphire Rapids) workstation has a RX 7800 XT and when I kexec
> a bunch of times, the amdgpu driver gets upset and barfs on boot.

yeah, that is an "intentional" HW feature and yes you're certainly not the first one to complain about it :(

The PSP (platform security processor IIRC) is designed in such a way that you can initialize it only once after a power cycle / hard reset for security reasons (e.g. to not leak crypto keys used for digital rights management etc..).

On dGPUs we work around that manually by power cycling the ASIC when that situation is detected during amdgpu load, but that unfortunately doesn't work 100% reliable.

On APUs the situation is even worse because the PSP is shared between the GPU and the CPU.

We have forwarded such complains internally for years, but there is not much else Alex and I can do about it.

Regards,
Christian.