linux-kernel - Re: [PATCH] riscv: Sync efi page table's kernel mappings before switching

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Message-Id: <166968223551.19322.16657482033494349394.b4-ty@rivosinc.com>
Date:   Mon, 28 Nov 2022 16:37:15 -0800
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Ard Biesheuvel <ardb@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        linux-efi@...r.kernel.org,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH] riscv: Sync efi page table's kernel mappings before switching

On Mon, 21 Nov 2022 14:33:03 +0100, Alexandre Ghiti wrote:
> The EFI page table is initially created as a copy of the kernel page table.
> With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area:
> if the stack is allocated in a new PGD (one that was not present at the
> moment of the efi page table creation or not synced in a previous vmalloc
> fault), the kernel will take a trap when switching to the efi page table
> when the vmalloc kernel stack is accessed, resulting in a kernel panic.
> 
> [...]

Applied, thanks!

[1/1] riscv: Sync efi page table's kernel mappings before switching
      https://git.kernel.org/palmer/c/3f105a742725

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