linux-kernel - Re: [PATCHv2 0/4] x86: 5-level related changes into decompression code

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Message-ID: <20171129154908.6y4st6xc7hbsey2v@pd.tnic>
Date:   Wed, 29 Nov 2017 16:49:08 +0100
From:   Borislav Petkov <bp@...e.de>
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>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Andi Kleen <ak@...ux.intel.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/4] x86: 5-level related changes into decompression
 code

On Sat, Nov 11, 2017 at 01:06:41AM +0300, Kirill A. Shutemov wrote:
> Hi Ingo,
> 
> Here's updated changes that prepare the code to boot-time switching between
> paging modes and handle booting in 5-level mode when bootloader put kernel
> image above 4G, but haven't enabled 5-level paging for us.

Btw, if I enable CONFIG_X86_5LEVEL with 4.15-rc1 on an AMD box, the box
triple-faults and ends up spinning in a reboot loop. Even though it
should say:

early console in setup code
This kernel requires the following features not present on the CPU:
la57 
Unable to boot - please use a kernel appropriate for your CPU.

and halt.

A kvm guest still does that but baremetal triple-faults.

Ideas?

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--