ARM64: hibernation: How to use hibernation/suspend-to-disk on ARMv8?

[George Bush]

Hi all

I notice we have hibernation.c in arm/kernel, however, I don't find it in arm64.
Does it mean arm64 do not support hibernation/suspend-to-disk function?

I tried some path to search the reason, but found nothing, they all say arm64
has the backward compatibility. So I send this email to the community and
hope to get the reason.
Thanks!

I ported the arm hibernation.c to arm64/kernel(with LP64), but failed in a
strange way. When I do resume, the arch_restore_image() get a page_fault
when it calls the copy_page(), like:
"Unable to handle kernel paging request at virtual address 0xffffffbc055c3fa8"
I'm sure the copy_page()'s parameters is in the memory area, why and how
I get the strange address 0xffffffbc055c3fa8?

vmalloc:         0xffffff8000000000 - 0xffffffbb00000000
vmemmap:     0xffffffbc01400000 - 0xffffffbc04f88000
modules:       0xffffffbffc000000   -  0xffffffc000000000
memory:        0xffffffc000000000 - 0xffffffc0be800000


Look forward to your reply, thanks!