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Fri, 11 Apr 2025 02:17:13 -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 05/18] arm64: Implement asm/kpkeys.h using POE Date: Fri, 11 Apr 2025 10:16:18 +0100 Message-ID: <20250411091631.954228-6-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-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 2FE9A8000A X-Stat-Signature: s7b9pgcowsf7imp61aejd4s5n8rg3ejf X-HE-Tag: 1744363037-353716 X-HE-Meta: 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 /PMbUj0D 4qTRFoOz32hKV4J4tIAUhZL4nYed0kN6DJO/+XvjNB6+QdRRShdDo+4/V6PxBdRP7ZqloyNJRRRAXhylsGiXtTnRdLFQJ9SPgxzRDdb3PgDapAeMDwoA5Blf7N83Khx5uLNvCqUip3HFHG/qG0uY15d3ZYZcMubsi7fIR0TKLhZXG/e4f/V66HI3/c3bf2i33BA8V 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: Implement the kpkeys interface if CONFIG_ARM64_POE is enabled. The permissions for KPKEYS_PKEY_DEFAULT (pkey 0) are set to RWX as this pkey is also used for code mappings. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/kpkeys.h | 49 +++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/arm64/include/asm/kpkeys.h diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h new file mode 100644 index 000000000000..3b0ab5e7dd22 --- /dev/null +++ b/arch/arm64/include/asm/kpkeys.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_KPKEYS_H +#define __ASM_KPKEYS_H + +#include +#include +#include + +#include + +static inline bool arch_kpkeys_enabled(void) +{ + return system_supports_poe(); +} + +#ifdef CONFIG_ARM64_POE + +static inline u64 por_set_kpkeys_level(u64 por, int level) +{ + por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RWX); + + return por; +} + +static __always_inline void __kpkeys_set_pkey_reg_nosync(u64 pkey_reg) +{ + write_sysreg_s(pkey_reg, SYS_POR_EL1); +} + +static __always_inline int arch_kpkeys_set_level(int level) +{ + u64 prev_por = read_sysreg_s(SYS_POR_EL1); + u64 new_por = por_set_kpkeys_level(prev_por, level); + + __kpkeys_set_pkey_reg_nosync(new_por); + isb(); + + return prev_por; +} + +static __always_inline void arch_kpkeys_restore_pkey_reg(u64 pkey_reg) +{ + __kpkeys_set_pkey_reg_nosync(pkey_reg); + isb(); +} + +#endif /* CONFIG_ARM64_POE */ + +#endif /* __ASM_KPKEYS_H */