linux-kernel - Re: [PATCH 9/9] x86/mm: Adjust virtual address space layout in early boot

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Message-ID: <20180214121049.z4cjsdwxaaq5gpv5@gmail.com>
Date:   Wed, 14 Feb 2018 13:10:49 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] x86/mm: Adjust virtual address space layout in early
 boot


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

> We need to adjust virtual address space to support switching between
> paging modes.
> 
> The adjustment happens in __startup_64().
> 
> We also have to change KASLR code that doesn't expect variable
> VMALLOC_SIZE_TB.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/x86/boot/compressed/kaslr.c        | 14 ++++++++--
>  arch/x86/include/asm/page_64_types.h    |  9 ++----
>  arch/x86/include/asm/pgtable_64_types.h | 25 +++++++++--------
>  arch/x86/kernel/head64.c                | 49 +++++++++++++++++++++++++++------
>  arch/x86/kernel/head_64.S               |  2 +-
>  arch/x86/mm/dump_pagetables.c           |  3 ++
>  arch/x86/mm/kaslr.c                     | 11 ++++----
>  7 files changed, 77 insertions(+), 36 deletions(-)

This is too large and risky - would it be possible to split this up into multiple, 
smaller patches?

Thanks,

	Ingo