linux-kernel - Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR

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Date:   Wed, 07 Jun 2023 20:29:32 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Hou Wenlong <houwenlong.hwl@...group.com>,
        linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <jiangshan.ljs@...group.com>,
        Hou Wenlong <houwenlong.hwl@...group.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Borislav Petkov <bp@...en8.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Srivatsa S. Bhat (VMware)" <srivatsa@...il.mit.edu>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Usama Arif <usama.arif@...edance.com>,
        virtualization@...ts.linux-foundation.org,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        x86@...nel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP

On Mon, May 15 2023 at 16:19, Hou Wenlong wrote:

> This patchset unifies FIXADDR_TOP as a variable for x86, allowing the
> fixmap area to be movable and relocated with the kernel image in the
> x86/PIE patchset [0]. This enables the kernel image to be relocated in
> the top 512G of the address space.

What for? What's the use case.

Please provide a proper argument why this is generally useful and
important.

Thanks,

        tglx