[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230625-multiple-diaper-1db88a75314e@spud>
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
>
Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)
Powered by blists - more mailing lists