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arm64: kexec_file: forbid kdump via kexec_file_load()

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Now that kexec_walk_memblock() can do the crash-kernel placement itself
architectures that don't support kdump via kexe_file_load() need to
explicitly forbid it.

We don't support this on arm64 until the kernel can add the elfcorehdr
and usable-memory-range fields to the DT. Without these the crash-kernel
overwrites the previous kernel's memory during startup.

Add a check to refuse crash image loading.

Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
James Morse 2018-12-07 10:14:39 +00:00 committed by Will Deacon
parent 121ca8e565
commit 394135c1ff
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/kernel/kexec_image.c
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@ -47,6 +47,10 @@ static void *image_load(struct kimage *image,
struct kexec_segment *kernel_segment;
int ret;
/* We don't support crash kernels yet. */
if (image->type == KEXEC_TYPE_CRASH)
return ERR_PTR(-EOPNOTSUPP);
/*
* We require a kernel with an unambiguous Image header. Per
* Documentation/booting.txt, this is the case when image_size