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Subject: Re: [PATCH 0/3] Move kernel mapping outside the linear mapping
To:     Palmer Dabbelt <palmer@dabbelt.com>
Cc:     corbet@lwn.net, Paul Walmsley <paul.walmsley@sifive.com>,
        aou@eecs.berkeley.edu, Arnd Bergmann <arnd@arndb.de>,
        aryabinin@virtuozzo.com, glider@google.com, dvyukov@google.com,
        linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
        linux-arch@vger.kernel.org, linux-mm@kvack.org
References: <mhng-cf5d29ec-e941-4579-8c42-2c11799a8f2f@penguin>
From:   Alex Ghiti <alex@ghiti.fr>
Message-ID: <fdc52c40-3324-fc9a-ffda-926ced856a80@ghiti.fr>
Date:   Sat, 20 Mar 2021 04:48:14 -0400
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Le 3/9/21 à 9:54 PM, Palmer Dabbelt a écrit :
> On Thu, 25 Feb 2021 00:04:50 PST (-0800), alex@ghiti.fr wrote:
>> I decided to split sv48 support in small series to ease the review.
>>
>> This patchset pushes the kernel mapping (modules and BPF too) to the last
>> 4GB of the 64bit address space, this allows to:
>> - implement relocatable kernel (that will come later in another
>>   patchset) that requires to move the kernel mapping out of the linear
>>   mapping to avoid to copy the kernel at a different physical address.
>> - have a single kernel that is not relocatable (and then that avoids the
>>   performance penalty imposed by PIC kernel) for both sv39 and sv48.
>>
>> The first patch implements this behaviour, the second patch introduces a
>> documentation that describes the virtual address space layout of the 
>> 64bit
>> kernel and the last patch is taken from my sv48 series where I simply 
>> added
>> the dump of the modules/kernel/BPF mapping.
>>
>> I removed the Reviewed-by on the first patch since it changed enough from
>> last time and deserves a second look.
>>
>> Alexandre Ghiti (3):
>>   riscv: Move kernel mapping outside of linear mapping
>>   Documentation: riscv: Add documentation that describes the VM layout
>>   riscv: Prepare ptdump for vm layout dynamic addresses
>>
>>  Documentation/riscv/index.rst       |  1 +
>>  Documentation/riscv/vm-layout.rst   | 61 ++++++++++++++++++++++
>>  arch/riscv/boot/loader.lds.S        |  3 +-
>>  arch/riscv/include/asm/page.h       | 18 ++++++-
>>  arch/riscv/include/asm/pgtable.h    | 37 +++++++++----
>>  arch/riscv/include/asm/set_memory.h |  1 +
>>  arch/riscv/kernel/head.S            |  3 +-
>>  arch/riscv/kernel/module.c          |  6 +--
>>  arch/riscv/kernel/setup.c           |  3 ++
>>  arch/riscv/kernel/vmlinux.lds.S     |  3 +-
>>  arch/riscv/mm/fault.c               | 13 +++++
>>  arch/riscv/mm/init.c                | 81 +++++++++++++++++++++++------
>>  arch/riscv/mm/kasan_init.c          |  9 ++++
>>  arch/riscv/mm/physaddr.c            |  2 +-
>>  arch/riscv/mm/ptdump.c              | 67 +++++++++++++++++++-----
>>  15 files changed, 258 insertions(+), 50 deletions(-)
>>  create mode 100644 Documentation/riscv/vm-layout.rst
> 
> This generally looks good, but I'm getting a bunch of checkpatch 
> warnings and some conflicts, do you mind fixing those up (and including 
> your other kasan patch, as that's likely to conflict)?

I have just tried to rebase this on for-next, and that quite conflicts 
with Vitaly's XIP patch, I'm fixing this and post a v3.

Alex