kho: add support for preserving vmalloc allocations
A vmalloc allocation is preserved using binary structure similar to
global KHO memory tracker. It's a linked list of pages where each page
is an array of physical address of pages in vmalloc area.
kho_preserve_vmalloc() hands out the physical address of the head page
to the caller. This address is used as the argument to
kho_vmalloc_restore() to restore the mapping in the vmalloc address
space and populate it with the preserved pages.
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
[pratyush@kernel.org: use KHO array instead of linked list of pages to
track physical addresses]
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
2 files changed
