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Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP
- To: Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
- From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Date: Wed, 07 Jun 2023 20:29:32 +0200
- Cc: Lai Jiangshan <jiangshan.ljs@xxxxxxxxxxxx>, Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>, Alexey Makhalov <amakhalov@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Anshuman Khandual <anshuman.khandual@xxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>, Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Srivatsa S. Bhat (VMware)" <srivatsa@xxxxxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Usama Arif <usama.arif@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, VMware PV-Drivers Reviewers <pv-drivers@xxxxxxxxxx>, x86@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 07 Jun 2023 18:29:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
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