linux-kernel - Re: [PATCH 23/62] x86/idt: Move IDT to data segment

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Message-ID: <64f1fa87-17c2-928b-06f5-17b6771fc753@suse.com>
Date:   Wed, 19 Feb 2020 11:47:33 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <Thomas.Lendacky@....com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 23/62] x86/idt: Move IDT to data segment

On 19.02.20 11:42, Joerg Roedel wrote:
> Hi Jürgen,
> 
> On Wed, Feb 12, 2020 at 05:28:21PM +0100, Jürgen Groß wrote:
>> Xen-PV is clearing BSS as the very first action.
> 
> In the kernel image? Or in the ELF loader before jumping to the kernel
> image?

In the kernel image.

See arch/x86/xen/xen-head.S - startup_xen is the entry point of the
kernel.


Juergen