From: Anup Patel <apatel@ventanamicro.com>
To: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Mike Rapoport <rppt@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Anup Patel <anup@brainfault.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
devicetree@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v8 0/4] riscv: Use PUD/P4D/PGD pages for the linear mapping
Date: Thu, 23 Mar 2023 17:48:16 +0530 [thread overview]
Message-ID: <CAK9=C2XJtSG2d_nsyDv7kU1v7Jj0chdevqrMc0MpJswukcEABA@mail.gmail.com> (raw)
In-Reply-To: <20230316131711.1284451-1-alexghiti@rivosinc.com>
Hi Alex,
On Thu, Mar 16, 2023 at 6:48 PM Alexandre Ghiti <alexghiti@rivosinc.com> wrote:
>
> This patchset intends to improve tlb utilization by using hugepages for
> the linear mapping.
>
> As reported by Anup in v6, when STRICT_KERNEL_RWX is enabled, we must
> take care of isolating the kernel text and rodata so that they are not
> mapped with a PUD mapping which would then assign wrong permissions to
> the whole region: it is achieved by introducing a new memblock API.
>
> Another patch makes use of this new API in arm64 which used some sort of
> hack to solve this issue: it was built/boot tested successfully.
>
> base-commit-tag: v6.3-rc1
>
> v8:
> - Fix rv32, as reported by Anup
> - Do not modify memblock_isolate_range and fixes comment, as suggested by Mike
> - Use the new memblock API for crash kernel too in arm64, as suggested by Andrew
> - Fix arm64 double mapping (which to me did not work in v7), but ends up not
> being pretty at all, will wait for comments from arm64 reviewers, but
> this patch can easily be dropped if they do not want it.
>
> v7:
> - Fix Anup bug report by introducing memblock_isolate_memory which
> allows us to split the memblock mappings and then avoid to map the
> the PUD which contains the kernel as read only
> - Add a patch to arm64 to use this newly introduced API
>
> v6:
> - quiet LLVM warning by casting phys_ram_base into an unsigned long
>
> v5:
> - Fix nommu builds by getting rid of riscv_pfn_base in patch 1, thanks
> Conor
> - Add RB from Andrew
>
> v4:
> - Rebase on top of v6.2-rc3, as noted by Conor
> - Add Acked-by Rob
>
> v3:
> - Change the comment about initrd_start VA conversion so that it fits
> ARM64 and RISCV64 (and others in the future if needed), as suggested
> by Rob
>
> v2:
> - Add a comment on why RISCV64 does not need to set initrd_start/end that
> early in the boot process, as asked by Rob
>
> Alexandre Ghiti (4):
> riscv: Get rid of riscv_pfn_base variable
> mm: Introduce memblock_isolate_memory
> arm64: Make use of memblock_isolate_memory for the linear mapping
> riscv: Use PUD/P4D/PGD pages for the linear mapping
Kernel boot fine on RV64 but there is a failure which is still not
addressed. You can see this failure as following message in
kernel boot log:
0.000000] Failed to add a System RAM resource at 80200000
Regards,
Anup
>
> arch/arm64/mm/mmu.c | 25 +++++++++++------
> arch/riscv/include/asm/page.h | 19 +++++++++++--
> arch/riscv/mm/init.c | 53 ++++++++++++++++++++++++++++-------
> arch/riscv/mm/physaddr.c | 16 +++++++++++
> drivers/of/fdt.c | 11 ++++----
> include/linux/memblock.h | 1 +
> mm/memblock.c | 20 +++++++++++++
> 7 files changed, 119 insertions(+), 26 deletions(-)
>
> --
> 2.37.2
>
next prev parent reply other threads:[~2023-03-23 12:18 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-16 13:17 [PATCH v8 0/4] riscv: Use PUD/P4D/PGD pages for the linear mapping Alexandre Ghiti
2023-03-16 13:17 ` [PATCH v8 1/4] riscv: Get rid of riscv_pfn_base variable Alexandre Ghiti
2023-03-16 13:17 ` [PATCH v8 2/4] mm: Introduce memblock_isolate_memory Alexandre Ghiti
2023-03-16 20:12 ` Mike Rapoport
2023-03-20 10:54 ` Alexandre Ghiti
2023-03-20 17:44 ` Mike Rapoport
2023-03-23 11:52 ` Alexandre Ghiti
2023-03-23 12:16 ` Mike Rapoport
2023-03-23 12:30 ` Alexandre Ghiti
2023-03-16 13:17 ` [PATCH v8 3/4] arm64: Make use of memblock_isolate_memory for the linear mapping Alexandre Ghiti
2023-03-24 15:21 ` Will Deacon
2023-03-24 15:23 ` Alexandre Ghiti
2023-03-16 13:17 ` [PATCH v8 4/4] riscv: Use PUD/P4D/PGD pages " Alexandre Ghiti
2023-03-23 12:18 ` Anup Patel [this message]
2023-03-23 12:54 ` [PATCH v8 0/4] " Alexandre Ghiti
2023-03-23 14:55 ` Anup Patel
2023-03-24 9:59 ` Alexandre Ghiti
[not found] ` <CAPqJEFr6MgUyARfbWAo7EeQKLVd4xRJz_LOYN68UC-kPD1Hr5A@mail.gmail.com>
2024-01-18 8:23 ` Fwd: " Nylon Chen
2024-01-18 13:01 ` Alexandre Ghiti
2024-01-19 9:26 ` Nylon Chen
2024-02-05 9:32 ` Alexandre Ghiti
2024-03-12 6:40 ` Nylon Chen
2024-03-12 6:48 ` Nylon Chen
2024-03-12 9:33 ` Alexandre Ghiti
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