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kexec: add machine_kexec_post_load()

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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>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pavel Tatashin 2019-12-04 10:59:15 -05:00 committed by Will Deacon
parent d42cc530b1
commit de68e4daea
4 changed files with 16 additions and 0 deletions
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4
kernel/kexec.c
View file

@ -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);

6
kernel/kexec_core.c
View file

@ -589,6 +589,12 @@ 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)

4
kernel/kexec_file.c
View file

@ -441,6 +441,10 @@ 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

2
kernel/kexec_internal.h
View file

@ -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