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

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Date:   Wed, 7 Jun 2023 05:49:15 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Hou Wenlong <houwenlong.hwl@...group.com>,
        linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <jiangshan.ljs@...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>,
        Thomas Gleixner <tglx@...utronix.de>,
        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 5/15/23 01:19, 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 problems does this patch set solve?  How might that solution be
visible to end users?  Why is this problem important to you?

Also, while you're waiting for someone to review _your_ code, have you
considered reviewing anyone else's code?  I don't think I've seen any
review activity from you lately.