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Subject: Re: [PATCH v1] RISC-V: mark hibernation as nonportable
From:   patchwork-bot+linux-riscv@kernel.org
Message-Id: <168554582182.8247.5723560098196678790.git-patchwork-notify@kernel.org>
Date:   Wed, 31 May 2023 15:10:21 +0000
References: <20230526-astride-detonator-9ae120051159@wendy>
In-Reply-To: <20230526-astride-detonator-9ae120051159@wendy>
To:     Conor Dooley <conor.dooley@microchip.com>
Cc:     linux-riscv@lists.infradead.org, palmer@dabbelt.com,
        conor@kernel.org, atishp@atishpatra.org, anup@brainfault.org,
        alex@ghiti.fr, linux-kernel@vger.kernel.org,
        paul.walmsley@sifive.com, suagrfillet@gmail.com,
        jeeheng.sia@starfivetech.com
Precedence: bulk

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer@rivosinc.com>:

On Fri, 26 May 2023 11:59:08 +0100 you wrote:
> Hibernation support depends on firmware marking its reserved/PMP
> protected regions as not accessible from Linux.
> The latest versions of the de-facto SBI implementation (OpenSBI) do
> not do this, having dropped the no-map property to enable 1 GiB huge
> page mappings by the kernel.
> This was exposed by commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages
> for the linear mapping"), which made the first 2 MiB of DRAM (where SBI
> typically resides) accessible by the kernel.
> Attempting to hibernate with either OpenSBI, or other implementations
> following its lead, will lead to a kernel panic ([1], [2]) as the
> hibernation process will attempt to save/restore any mapped regions,
> including the PMP protected regions in use by the SBI implementation.
> 
> [...]

Here is the summary with links:
  - [v1] RISC-V: mark hibernation as nonportable
    https://git.kernel.org/riscv/c/ed309ce52218

You are awesome, thank you!
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