On Mon, 28 Sep 2026 15:46:46 +0530, Shivang Upadhyay wrote:
> During Fadump in Qemu VM, when maxcpus value is set to more than current
> cpus, following failure is observed.
>
> [ 0.045806] [ T1] rtas fadump: Dump taken by platform is
> incomplete (0)
>
> This is because the CPU_STATE_DATA is allocated for maxcpus, while the
> data is only filled for current cpus. As per current implementation
> of Fadump, dumped_bytes and source_len for a region have to match,
> Which is failing for qemu's case, Even tough the dumped bytes are
> reported correctly for only the current cpus. After this /proc/vmcore
> generatition also fails.
>
> [...]
Applied to powerpc/next.
[1/1] ppc/fadump: collect dump when CPU_STATE_DATA is less than reserved
https://git.kernel.org/powerpc/c/b3d75e2bc299a759de2fd11649c7ed275b1b2067
cheers
