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@xxxxxxxxxxx>
> ---
> 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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