linux-kernel - Re: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable"

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Date:   Sun, 25 Jun 2023 15:18:49 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Song Shuai <songshuaishuai@...ylab.org>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, robh+dt@...nel.org, frowand.list@...il.com,
        ajones@...tanamicro.com, alexghiti@...osinc.com,
        mpe@...erman.id.au, arnd@...db.de, rppt@...nel.org,
        samuel@...lland.org, panqinglin2020@...as.ac.cn,
        conor.dooley@...rochip.com, anup@...infault.org,
        xianting.tian@...ux.alibaba.com, anshuman.khandual@....com,
        heiko@...ech.de, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable"

On Sun, Jun 25, 2023 at 10:09:29PM +0800, Song Shuai wrote:
> This reverts commit ed309ce522185583b163bd0c74f0d9f299fe1826.
> 
> With the commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the
> linear mapping") reverted, the MIN_MEMBLOCK_ADDR points the kernel
> load address which was placed at a PMD boundary.

> And firmware always
> correctly mark resident memory, or memory protected with PMP as
> per the devicetree specification and/or the UEFI specification.

But this is not true? The versions of OpenSBI that you mention in your
cover letter do not do this.
Please explain.

> So those regions will not be mapped in the linear mapping and they
> can be safely saved/restored by hibernation.
> 
> Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
> ---
>  arch/riscv/Kconfig | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 5966ad97c30c..17b5fc7f54d4 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -800,11 +800,8 @@ menu "Power management options"
>  
>  source "kernel/power/Kconfig"
>  
> -# Hibernation is only possible on systems where the SBI implementation has
> -# marked its reserved memory as not accessible from, or does not run
> -# from the same memory as, Linux
>  config ARCH_HIBERNATION_POSSIBLE
> -	def_bool NONPORTABLE
> +	def_bool y
>  
>  config ARCH_HIBERNATION_HEADER
>  	def_bool HIBERNATION
> -- 
> 2.20.1
> 

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