From: Alexandre Ghiti <alexghiti@rivosinc.com>
To: Anup Patel <apatel@ventanamicro.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 13:54:05 +0100 [thread overview]
Message-ID: <CAHVXubhhxpzHDM-n91V_rceY5t_VqLvrwZj3RP_tNL2=F9mqjQ@mail.gmail.com> (raw)
In-Reply-To: <CAK9=C2XJtSG2d_nsyDv7kU1v7Jj0chdevqrMc0MpJswukcEABA@mail.gmail.com>
Hi Anup,
On Thu, Mar 23, 2023 at 1:18 PM Anup Patel <apatel@ventanamicro.com> wrote:
>
> 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
Hmmm I don't get that in any of my test configs, would you mind
sharing yours and your qemu command line?
Thanks
>
> 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
> >
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next prev parent reply other threads:[~2023-03-23 12:54 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 ` [PATCH v8 0/4] " Anup Patel
2023-03-23 12:54 ` Alexandre Ghiti [this message]
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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