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From:   Anup Patel <anup@brainfault.org>
Date:   Mon, 20 May 2019 14:14:56 +0530
Message-ID: <CAAhSdy0nZVHRNBSyVOiy99_f7qLTO6jzucCnhautHGgNq42JXw@mail.gmail.com>
Subject: Re: [PATCH v4 0/2] Two-stagged initial page table setup
To:     Anup Patel <Anup.Patel@wdc.com>
Cc:     Palmer Dabbelt <palmer@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Atish Patra <Atish.Patra@wdc.com>,
        Christoph Hellwig <hch@infradead.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Thu, May 2, 2019 at 10:32 AM Anup Patel <Anup.Patel@wdc.com> wrote:
>
> This patchset implements two-stagged initial page table setup using fixmap
> to avoid mapping non-existent RAM and also reduce high_memory consumed by
> initial page tables.
>
> The patchset is based on Linux-5.1-rc7 and tested on SiFive Unleashed board
> and QEMU virt machine.
>
> These patches can be found in riscv_setup_vm_v4 branch of
> https//github.com/avpatel/linux.git
>
> Changes since v3:
> - Changed patch series subject.
> - Dropped PATCH1 because it's already merged
> - Dropped PATCH3 because trampoline page table handles a corner case
>   for 32bit systems where load address range overlaps kernel virtual
>   address range
> - Revamped PATCH for 4K aligned booting into two-stagged initial page
>   table setup
>
> Changes since v2:
> - Dropped PATCH2 because we have separate fix for Linux-5.1-rcX
> - Moved PATCH5 to PATCH2
> - Moved PATCH4 to PATCH3
> - The "Booting kernel from any 4KB aligned address" is now PATCH4
>
> Changes since v1:
> - Add kconfig option BOOT_PAGE_ALIGNED to enable 4KB aligned booting
> - Improved initial page table setup code to select best/biggest
>   possible mapping size based on load address alignment
> - Added PATCH4 to remove redundant trampoline page table
> - Added PATCH5 to fix memory reservation in setup_bootmem()
>
> Anup Patel (2):
>   RISC-V: Fix memory reservation in setup_bootmem()
>   RISC-V: Setup initial page tables in two stages
>
>  arch/riscv/include/asm/fixmap.h     |   5 +
>  arch/riscv/include/asm/pgtable-64.h |   5 +
>  arch/riscv/include/asm/pgtable.h    |   7 +
>  arch/riscv/kernel/head.S            |  17 +-
>  arch/riscv/kernel/setup.c           |   4 +-
>  arch/riscv/mm/init.c                | 327 ++++++++++++++++++++++------
>  6 files changed, 289 insertions(+), 76 deletions(-)
>
> --
> 2.17.1

Hi All,

Any comments on this patchset?

Regards,
Anup