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

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Message-ID: <20190419113621.GD10324@zn.tnic>
Date:   Fri, 19 Apr 2019 13:36:21 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     Kairui Song <kasong@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Junichi Nomura <j-nomura@...jp.nec.com>,
        Dave Young <dyoung@...hat.com>,
        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 19, 2019 at 01:28:01PM +0200, Borislav Petkov wrote:
> Read again what I said: "should all be passed through boot_params".
> Which means, boot_params should be extended with a field of a flag to
> say: "this is a kexec'ed kernel".

And by that I mean similar to the XLF_EFI_KEXEC mechanism. The first
kernel or kexec(1) should prepare the info needed by the kexec'ed
kernel.

-- 
Regards/Gruss,
    Boris.

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