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SubjectRe: [PATCH v5 13/17] kexec: add machine_kexec_post_load()
On 09/23/19 at 04:34pm, Pavel Tatashin wrote:
> It is the same as machine_kexec_prepare(), but is called after segments are
> loaded. This way, can do processing work with already loaded relocation
> segments. One such example is arm64: it has to have segments loaded in
> order to create a page table, but it cannot do it during kexec time,
> because at that time allocations won't be possible anymore.
>
> Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> ---
> kernel/kexec.c | 4 ++++
> kernel/kexec_core.c | 6 ++++++
> kernel/kexec_file.c | 4 ++++
> kernel/kexec_internal.h | 2 ++
> 4 files changed, 16 insertions(+)
>
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 1b018f1a6e0d..27b71dc7b35a 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -159,6 +159,10 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
>
> kimage_terminate(image);
>
> + ret = machine_kexec_post_load(image);
> + if (ret)
> + goto out;
> +
> /* Install the new kernel and uninstall the old */
> image = xchg(dest_image, image);
>
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index 2c5b72863b7b..8360645d1bbe 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -587,6 +587,12 @@ static void kimage_free_extra_pages(struct kimage *image)
> kimage_free_page_list(&image->unusable_pages);
>
> }
> +
> +int __weak machine_kexec_post_load(struct kimage *image)
> +{
> + return 0;
> +}
> +
> void kimage_terminate(struct kimage *image)
> {
> if (*image->entry != 0)
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index b8cc032d5620..cb531d768114 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -391,6 +391,10 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
>
> kimage_terminate(image);
>
> + ret = machine_kexec_post_load(image);
> + if (ret)
> + goto out;
> +
> /*
> * Free up any temporary buffers allocated which are not needed
> * after image has been loaded
> diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h
> index 48aaf2ac0d0d..39d30ccf8d87 100644
> --- a/kernel/kexec_internal.h
> +++ b/kernel/kexec_internal.h
> @@ -13,6 +13,8 @@ void kimage_terminate(struct kimage *image);
> int kimage_is_destination_range(struct kimage *image,
> unsigned long start, unsigned long end);
>
> +int machine_kexec_post_load(struct kimage *image);
> +
> extern struct mutex kexec_mutex;
>
> #ifdef CONFIG_KEXEC_FILE
> --
> 2.23.0
>
>
> _______________________________________________
> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec

Acked-by: Dave Young <dyoung@redhat.com>

Thanks
Dave

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