Re: [PATCHv7 07/19] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL

[Ingo Molnar]

* Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:

> We need to be able to adjust virtual memory layout at runtime to be able
> to switch between 4- and 5-level paging at boot-time.
> 
> KASLR already has movable __VMALLOC_BASE, __VMEMMAP_BASE and __PAGE_OFFSET.
> Let's re-use it.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> ---
>  arch/x86/include/asm/kaslr.h            | 4 ----
>  arch/x86/include/asm/page_64.h          | 4 ++++
>  arch/x86/include/asm/page_64_types.h    | 2 +-
>  arch/x86/include/asm/pgtable_64_types.h | 2 +-
>  arch/x86/kernel/head64.c                | 9 +++++++++
>  arch/x86/mm/kaslr.c                     | 8 --------
>  6 files changed, 15 insertions(+), 14 deletions(-)

> +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL)
> +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL)
> +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL)

Yeah, so this calls for a new, properly named Kconfig helper variable.

Thanks,

	Ingo