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

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Date:   Wed, 07 Jun 2023 15:44:01 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     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 Mon, May 15, 2023 at 04:19:31PM +0800, 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.
> 
> [0] https://lore.kernel.org/lkml/cover.1682673542.git.houwenlong.hwl@antgroup.com
> 
> Hou Wenlong (4):
>   x86/vsyscall: Don't use set_fixmap() to map vsyscall page
>   x86/xen: Pin up to VSYSCALL_ADDR when vsyscall page is out of fixmap
>     area
>   x86/fixmap: Move vsyscall page out of fixmap area
>   x86/fixmap: Unify FIXADDR_TOP
> 
>  arch/x86/entry/vsyscall/vsyscall_64.c |  7 +-----
>  arch/x86/include/asm/fixmap.h         | 28 ++++-------------------
>  arch/x86/include/asm/paravirt.h       |  7 ++++++
>  arch/x86/include/asm/paravirt_types.h |  4 ++++
>  arch/x86/include/asm/vsyscall.h       | 13 +++++++++++
>  arch/x86/kernel/head64.c              |  1 -
>  arch/x86/kernel/head_64.S             |  6 ++---
>  arch/x86/kernel/paravirt.c            |  4 ++++
>  arch/x86/mm/dump_pagetables.c         |  3 ++-
>  arch/x86/mm/fault.c                   |  1 -
>  arch/x86/mm/init_64.c                 |  2 +-
>  arch/x86/mm/ioremap.c                 |  5 ++---
>  arch/x86/mm/pgtable.c                 | 13 +++++++++++
>  arch/x86/mm/pgtable_32.c              |  3 ---
>  arch/x86/xen/mmu_pv.c                 | 32 +++++++++++++++++++--------
>  15 files changed, 77 insertions(+), 52 deletions(-)
> 
> 
> base-commit: f585d5177e1aad174fd6da0e3936b682ed58ced0
> --
> 2.31.1
Hi,

Just wanted to send a kind ping on this patchset.

Thanks.