linux-kernel - Re: [PATCHv4 00/14] Boot-time switching between 4- and 5-level paging

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Date:   Mon, 14 Aug 2017 17:30:07 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Ingo Molnar <mingo@...hat.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 00/14] Boot-time switching between 4- and 5-level paging

On Tue, Aug 08, 2017 at 03:54:01PM +0300, Kirill A. Shutemov wrote:
> The basic idea is to implement the same logic as pgtable-nop4d.h provides,
> but at runtime.
> 
> Runtime folding is only implemented for CONFIG_X86_5LEVEL=y case. With the
> option disabled, we do compile-time folding as before..
> 
> Initially, I tried to fold pgd instread. I've got to shell, but it
> required a lot of hacks as kernel threats pgd in a special way.
> 
> Please review and consider applying.

Ingo, any feedback on this?

-- 
 Kirill A. Shutemov