linux-kernel - Re: [RFC PATCH] kexec, x86/boot: map systab region in identity mapping before accessing it

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Message-ID: <20190426095800.GB4608@zn.tnic>
Date:   Fri, 26 Apr 2019 11:58:00 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Junichi Nomura <j-nomura@...jp.nec.com>, dyoung@...hat.com,
        Kairui Song <kasong@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Chao Fan <fanc.fnst@...fujitsu.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>
Subject: Re: [RFC PATCH] kexec, x86/boot: map systab region in identity
 mapping before accessing it

On Fri, Apr 26, 2019 at 05:51:34PM +0800, Baoquan He wrote:
> I can make a patch to add a bit into xloadflags, to indicate that this
> is kexec-ed kernel. It can help to differentiate kexec-ed kernel from
> kdump kernel.

>From the recent snafu, the only thing we needed is to differentiate
between the *first* kernel and the following kernel(s) which has been
started/loaded using a kexec syscall.

-- 
Regards/Gruss,
    Boris.

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