linux-kernel - Re: [PATCHv6 0/4] x86: 5-level related changes into decompression code<Paste>

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Message-ID: <20180112083757.okwsvdhqaodt2d3u@node.shutemov.name>
Date:   Fri, 12 Jan 2018 11:37:57 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.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>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 0/4] x86: 5-level related changes into decompression
 code<Paste>

On Mon, Jan 08, 2018 at 05:18:05PM +0100, Ingo Molnar wrote:
> 
> * Kirill A. Shutemov <kirill@...temov.name> wrote:
> 
> > On Tue, Dec 12, 2017 at 04:57:35PM +0300, Kirill A. Shutemov wrote:
> > > Here's few changes to x86 decompression code.
> > > 
> > > The first patch is pure cosmetic change: it gives file with KASLR helpers
> > > a proper name.
> > > 
> > > The last three patches bring support of booting into 5-level paging mode if
> > > a bootloader put the kernel above 4G.
> > > 
> > > Patch 2/4 Renames l5_paging_required() into paging_prepare() and change
> > > interface of the function.
> > > Patch 3/4 Handles allocation of space for trampoline and gets it prepared.
> > > Patch 4/4 Gets trampoline used.
> > > 
> > > Kirill A. Shutemov (4):
> > >   x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c
> > >   x86/boot/compressed/64: Introduce paging_prepare()
> > >   x86/boot/compressed/64: Prepare trampoline memory
> > >   x86/boot/compressed/64: Handle 5-level paging boot if kernel is above
> > >     4G
> > 
> > Ingo, does it look fine now?
> 
> Yes, it looks structurally much better now - but we first need to address all 
> existing regressions before we can move forward.

There's a fix for kdump issue that maintainers are okay about.

Is there any other regression do you have in mind?

-- 
 Kirill A. Shutemov