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Fri, 11 Apr 2025 02:17:58 -0700 (PDT) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Mark Brown , Catalin Marinas , Dave Hansen , David Hildenbrand , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Andy Lutomirski , Marc Zyngier , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , "Mike Rapoport (IBM)" , Ryan Roberts , Thomas Gleixner , Will Deacon , Matthew Wilcox , Qi Zheng , linux-arm-kernel@lists.infradead.org, x86@kernel.org Subject: [RFC PATCH v4 16/18] arm64: Enable kpkeys_hardened_pgtables support Date: Fri, 11 Apr 2025 10:16:29 +0100 Message-ID: <20250411091631.954228-17-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250411091631.954228-1-kevin.brodsky@arm.com> References: <20250411091631.954228-1-kevin.brodsky@arm.com> MIME-Version: 1.0 X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5AB1C40007 X-Stat-Signature: joteh5i6mn1m1oj77sp9zpbikycpfshq X-Rspam-User: X-HE-Tag: 1744363083-724665 X-HE-Meta: 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 nnQiH5kV H6QDhJ9FYywCNS/jNDJPKf7QIJQXOKsfo93AoDRAHiZkA353tBWck4bS6WFWcdnkhr4zWsWN2G4Lgu7c5pDePwzqumbjSpgV1oTVkaa5WPsRM+ugmDNygXYlLEzaUgYMAc84QWrT2KT0bWPiHL8vg4HJpvzW5LN/oPaZowX1P7eAkB8Y2zwpOXACj+otikGZRfbl1G9jEIMb7iEDQgxJPE+95frAg0+rk9hkFW82WGz9LpPvRePPxeCqjlPrrYTpcMWnxCfx7+OnZ9efQMgJAK/hjros5Fkxt0F7H X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: kpkeys_hardened_pgtables should be enabled as early as possible (if selected). It does however require kpkeys being available, which means on arm64 POE being detected and enabled. POE is a boot feature, so calling kpkeys_hardened_pgtables_enable() just after setup_boot_cpu_features() in smp_prepare_boot_cpu() is the best we can do. With that done, all the bits are in place and we can advertise support for kpkeys_hardened_pgtables by selecting ARCH_HAS_KPKEYS_HARDENED_PGTABLES if ARM64_POE is enabled. Signed-off-by: Kevin Brodsky --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/smp.c | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5f81db8134da..3d90b895e2ef 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2199,6 +2199,7 @@ config ARM64_POE select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS select ARCH_HAS_KPKEYS + select ARCH_HAS_KPKEYS_HARDENED_PGTABLES help The Permission Overlay Extension is used to implement Memory Protection Keys. Memory Protection Keys provides a mechanism for diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 3b3f6b56e733..074cab55f9db 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include @@ -468,6 +469,7 @@ void __init smp_prepare_boot_cpu(void) if (system_uses_irq_prio_masking()) init_gic_priority_masking(); + kpkeys_hardened_pgtables_enable(); kasan_init_hw_tags(); /* Init percpu seeds for random tags after cpus are set up. */ kasan_init_sw_tags();