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

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Date:   Wed, 14 Feb 2018 15:19:10 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
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

On Wed, Feb 14, 2018 at 12:10:49PM +0000, Ingo Molnar wrote:
> 
> * 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?

Let me check what I can do here.

If you are fine with previous patches please apply. I will send split up
of this patch separately.

-- 
 Kirill A. Shutemov