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[2003:cb:c721:a000:7426:f6b4:82a3:c6ab]) by smtp.gmail.com with ESMTPSA id c13-20020adfe70d000000b003316aeb280esm4965195wrm.104.2023.11.24.11.51.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Nov 2023 11:51:40 -0800 (PST) Message-ID: <91c5d2e2-57b1-4172-88e0-cd07a8d85af4@redhat.com> Date: Fri, 24 Nov 2023 20:51:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 13/27] arm64: mte: Make tag storage depend on ARCH_KEEP_MEMBLOCK To: Alexandru Elisei , catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org References: <20231119165721.9849-1-alexandru.elisei@arm.com> <20231119165721.9849-14-alexandru.elisei@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 19.11.23 17:57, Alexandru Elisei wrote: > Tag storage memory requires that the tag storage pages used for data are > always migratable when they need to be repurposed to store tags. > > If ARCH_KEEP_MEMBLOCK is enabled, kexec will scan all non-reserved > memblocks to find a suitable location for copying the kernel image. The > kernel image, once loaded, cannot be moved to another location in physical > memory. The initialization code for the tag storage reserves the memblocks > for the tag storage pages, which means kexec will not use them, and the tag > storage pages can be migrated at any time, which is the desired behaviour. > > However, if ARCH_KEEP_MEMBLOCK is not selected, kexec will not skip a > region unless the memory resource has the IORESOURCE_SYSRAM_DRIVER_MANAGED > flag, which isn't currently set by the tag storage initialization code. > > Make ARM64_MTE_TAG_STORAGE depend on ARCH_KEEP_MEMBLOCK to make it explicit > that that the Kconfig option required for it to work correctly. > > Signed-off-by: Alexandru Elisei > --- > arch/arm64/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 047487046e8f..efa5b7958169 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2065,6 +2065,7 @@ config ARM64_MTE > if ARM64_MTE > config ARM64_MTE_TAG_STORAGE > bool "Dynamic MTE tag storage management" > + depends on ARCH_KEEP_MEMBLOCK > select CONFIG_CMA > help > Adds support for dynamic management of the memory used by the hardware Doesn't arm64 select that unconditionally? Why is this required then? -- Cheers, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel