linux-kernel - Re: [PATCH] riscv: Fix kfence now that the linear mapping can be backed by PUD/P4D/PGD

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Message-Id: <168623309503.19530.6891077660786418703.b4-ty@rivosinc.com>
Date:   Thu, 08 Jun 2023 07:04:55 -0700
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        kasan-dev@...glegroups.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     syzbot+a74d57bddabbedd75135@...kaller.appspotmail.com
Subject: Re: [PATCH] riscv: Fix kfence now that the linear mapping can be
 backed by PUD/P4D/PGD


On Tue, 06 Jun 2023 15:04:44 +0200, Alexandre Ghiti wrote:
> RISC-V Kfence implementation used to rely on the fact the linear mapping
> was backed by at most PMD hugepages, which is not true anymore since
> commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the linear
> mapping").
> 
> Instead of splitting PUD/P4D/PGD mappings afterwards, directly map the
> kfence pool region using PTE mappings by allocating this region before
> setup_vm_final().
> 
> [...]

Applied, thanks!

[1/1] riscv: Fix kfence now that the linear mapping can be backed by PUD/P4D/PGD
      https://git.kernel.org/palmer/c/25abe0db9243

Best regards,
-- 
Palmer Dabbelt <palmer@...osinc.com>