On Mon, 31 May 2021 20:37:49 +0100,
Ard Biesheuvel [off-list ref] wrote:

On Mon, 31 May 2021 at 11:57, Marc Zyngier [off-list ref] wrote:

quoted

It has been reported that kexec_file doesn't really work on arm64.
It completely ignores any of the existing reservations, which results
in the secondary kernel being loaded where the GICv3 LPI tables live,
or even corrupting the ACPI tables.

Since only crash kernels are imune to this as they use a reserved
memory region, disable the non-crash kernel use case. Further
patches will try and restore the functionality.

Reported-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org # 5.10

Acked-by: Ard Biesheuvel <ardb@kernel.org>

... but do we really only need this in 5.10 and not earlier?

We *do* need something in earlier kernel (as mentioned in the cover
letter), but not this patch (arch_kexec_locate_mem_hole doesn't exist
there, so there is nothing to override).

I guess that completely disabling CONFIG_KEXEC_FILE on arm64 is the
way to go for 5.4 and earlier, as I don't think there is any crash
kernel support there.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel