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

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Date:   Sun, 25 Jun 2023 22:09:29 +0800
From:   Song Shuai <songshuaishuai@...ylab.org>
To:     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, songshuaishuai@...ylab.org,
        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
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable"

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.

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