linux-kernel - Re: [PATCHv7 07/19] x86/mm: Make virtual memory layout movable for CONFIG_X86

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Date:   Thu, 28 Sep 2017 10:19:39 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 07/19] x86/mm: Make virtual memory layout movable for
 CONFIG_X86_5LEVEL


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> 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@...ux.intel.com>
> ---
>  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