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Sun, 25 Jun 2023 08:09:30 -0700 (PDT) Received: from [0.0.0.0] ([5.180.77.117]) by smtp.gmail.com with ESMTPSA id iz13-20020a170902ef8d00b001b7fe13c97csm686590plb.72.2023.06.25.08.09.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 25 Jun 2023 08:09:30 -0700 (PDT) Message-ID: <20281f01-2cc9-892e-beea-eb2bb91e3ca5@gmail.com> Date: Sun, 25 Jun 2023 23:09:21 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable" To: Conor Dooley Cc: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, robh+dt@kernel.org, frowand.list@gmail.com, ajones@ventanamicro.com, alexghiti@rivosinc.com, mpe@ellerman.id.au, arnd@arndb.de, rppt@kernel.org, samuel@sholland.org, panqinglin2020@iscas.ac.cn, conor.dooley@microchip.com, anup@brainfault.org, xianting.tian@linux.alibaba.com, anshuman.khandual@arm.com, heiko@sntech.de, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20230625140931.1266216-1-songshuaishuai@tinylab.org> <20230625140931.1266216-2-songshuaishuai@tinylab.org> <20230625-multiple-diaper-1db88a75314e@spud> From: Song Shuai In-Reply-To: <20230625-multiple-diaper-1db88a75314e@spud> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230625_080933_540510_A4C61805 X-CRM114-Status: GOOD ( 17.35 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; 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Sun, 25 Jun 2023 08:09:30 -0700 (PDT) Received: from [0.0.0.0] ([5.180.77.117]) by smtp.gmail.com with ESMTPSA id iz13-20020a170902ef8d00b001b7fe13c97csm686590plb.72.2023.06.25.08.09.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 25 Jun 2023 08:09:30 -0700 (PDT) Message-ID: <20281f01-2cc9-892e-beea-eb2bb91e3ca5@gmail.com> Date: Sun, 25 Jun 2023 23:09:21 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable" To: Conor Dooley Cc: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, robh+dt@kernel.org, frowand.list@gmail.com, ajones@ventanamicro.com, alexghiti@rivosinc.com, mpe@ellerman.id.au, arnd@arndb.de, rppt@kernel.org, samuel@sholland.org, panqinglin2020@iscas.ac.cn, conor.dooley@microchip.com, anup@brainfault.org, xianting.tian@linux.alibaba.com, anshuman.khandual@arm.com, heiko@sntech.de, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20230625140931.1266216-1-songshuaishuai@tinylab.org> <20230625140931.1266216-2-songshuaishuai@tinylab.org> <20230625-multiple-diaper-1db88a75314e@spud> From: Song Shuai In-Reply-To: <20230625-multiple-diaper-1db88a75314e@spud> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Sorry for the delayed reply, My tinylab email went something wrong, I'll use gmail in this thread. 在 2023/6/25 22:18, Conor Dooley 写道: > 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. > At this time, OpenSbi [v0.8,v1.3) and edk2(RiscVVirt) indeed don't obey the DT/UEFI spec. This statement is excerpted from "Reserved memory for resident firmware" part from the upcoming riscv/boot.rst. It isn't accurate for now. How about deleting this one? Actually with 3335068f8721 reverted, the change of MIN_MEMBLOCK_ADDR can avoid the mapping of firmware memory, I will make it clear in the next version. >> 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 >> --- >> 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 >>