linux-kernel - Re: [PATCH v2 0/3] x86: fix brk area initialization

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Message-ID: <2592493b-4339-3e54-8acf-585dcf90be96@suse.com>
Date:   Wed, 29 Jun 2022 16:10:04 +0200
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        regressions@...ts.linux.dev
Subject: Re: [PATCH v2 0/3] x86: fix brk area initialization

On 23.06.22 11:46, Juergen Gross wrote:
> The brk area needs to be zeroed initially, like the .bss section.
> At the same time its memory should be covered by the ELF program
> headers.
> 
> Juergen Gross (3):
>    x86/xen: use clear_bss() for Xen PV guests
>    x86: fix setup of brk area
>    x86: fix .brk attribute in linker script
> 
>   arch/x86/include/asm/setup.h  |  3 +++
>   arch/x86/kernel/head64.c      |  4 +++-
>   arch/x86/kernel/vmlinux.lds.S |  2 +-
>   arch/x86/xen/enlighten_pv.c   |  8 ++++++--
>   arch/x86/xen/xen-head.S       | 10 +---------
>   5 files changed, 14 insertions(+), 13 deletions(-)
> 

Could I please have some feedback? This series is fixing a major
regression regarding running as Xen PV guest (depending on kernel
configuration system will crash very early).

#regzbot ^introduced e32683c6f7d2


Juergen

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