From: Catalin Marinas <catalin.marinas@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon <will@kernel.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Szabolcs Nagy <szabolcs.nagy@arm.com>, Richard Earnshaw <Richard.Earnshaw@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Andrey Konovalov <andreyknvl@google.com>, Peter Collingbourne <pcc@google.com>, linux-mm@kvack.org, linux-arch@vger.kernel.org Subject: [PATCH v2 07/19] arm64: mte: Tags-aware copy_page() implementation Date: Wed, 26 Feb 2020 18:05:14 +0000 [thread overview] Message-ID: <20200226180526.3272848-8-catalin.marinas@arm.com> (raw) In-Reply-To: <20200226180526.3272848-1-catalin.marinas@arm.com> From: Vincenzo Frascino <vincenzo.frascino@arm.com> When the Memory Tagging Extension is enabled, the tags need to be preserved across page copy (e.g. for copy-on-write). Introduce MTE-aware copy_page() which preserves the tags across page copy. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> --- arch/arm64/lib/copy_page.S | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index e7a793961408..c3234175efe0 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -25,6 +25,29 @@ alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] alternative_else_nop_endif +#ifdef CONFIG_ARM64_MTE +alternative_if_not ARM64_MTE + b 2f +alternative_else_nop_endif + /* + * Copy tags if MTE has been enabled. + */ + mov x2, x0 + mov x3, x1 + + multitag_transfer_size x7, x5 +1: + ldgm x4, [x3] + stgm x4, [x2] + + add x2, x2, x7 + add x3, x3, x7 + + tst x2, #(PAGE_SIZE - 1) + b.ne 1b +2: +#endif + ldp x2, x3, [x1] ldp x4, x5, [x1, #16] ldp x6, x7, [x1, #32]
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, Richard Earnshaw <Richard.Earnshaw@arm.com>, Szabolcs Nagy <szabolcs.nagy@arm.com>, Andrey Konovalov <andreyknvl@google.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Peter Collingbourne <pcc@google.com>, linux-mm@kvack.org, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org> Subject: [PATCH v2 07/19] arm64: mte: Tags-aware copy_page() implementation Date: Wed, 26 Feb 2020 18:05:14 +0000 [thread overview] Message-ID: <20200226180526.3272848-8-catalin.marinas@arm.com> (raw) In-Reply-To: <20200226180526.3272848-1-catalin.marinas@arm.com> From: Vincenzo Frascino <vincenzo.frascino@arm.com> When the Memory Tagging Extension is enabled, the tags need to be preserved across page copy (e.g. for copy-on-write). Introduce MTE-aware copy_page() which preserves the tags across page copy. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> --- arch/arm64/lib/copy_page.S | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index e7a793961408..c3234175efe0 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -25,6 +25,29 @@ alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] alternative_else_nop_endif +#ifdef CONFIG_ARM64_MTE +alternative_if_not ARM64_MTE + b 2f +alternative_else_nop_endif + /* + * Copy tags if MTE has been enabled. + */ + mov x2, x0 + mov x3, x1 + + multitag_transfer_size x7, x5 +1: + ldgm x4, [x3] + stgm x4, [x2] + + add x2, x2, x7 + add x3, x3, x7 + + tst x2, #(PAGE_SIZE - 1) + b.ne 1b +2: +#endif + ldp x2, x3, [x1] ldp x4, x5, [x1, #16] ldp x6, x7, [x1, #32] _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-02-26 18:05 UTC|newest] Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-26 18:05 [PATCH v2 00/19] arm64: Memory Tagging Extension user-space support Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 01/19] arm64: alternative: Allow alternative_insn to always issue the first instruction Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 02/19] arm64: mte: system register definitions Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 03/19] arm64: mte: CPU feature detection and initial sysreg configuration Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 04/19] arm64: mte: Use Normal Tagged attributes for the linear map Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-03-05 16:21 ` Steven Price 2020-03-05 16:21 ` Steven Price 2020-03-05 16:38 ` Catalin Marinas 2020-03-05 16:38 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 05/19] arm64: mte: Assembler macros and default architecture for .S files Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 06/19] arm64: mte: Tags-aware clear_page() implementation Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas [this message] 2020-02-26 18:05 ` [PATCH v2 07/19] arm64: mte: Tags-aware copy_page() implementation Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 08/19] arm64: Tags-aware memcmp_pages() implementation Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 09/19] arm64: mte: Add specific SIGSEGV codes Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 19:05 ` Eric W. Biederman 2020-02-26 19:05 ` Eric W. Biederman 2020-02-26 19:05 ` Eric W. Biederman 2020-02-26 19:26 ` Catalin Marinas 2020-02-26 19:26 ` Catalin Marinas 2020-02-26 22:33 ` kbuild test robot 2020-02-26 22:33 ` kbuild test robot 2020-02-26 22:33 ` kbuild test robot 2020-02-27 11:05 ` Catalin Marinas 2020-02-27 11:05 ` Catalin Marinas 2020-02-27 11:05 ` Catalin Marinas 2020-02-27 15:20 ` Eric W. Biederman 2020-02-27 15:20 ` Eric W. Biederman 2020-02-27 15:20 ` Eric W. Biederman 2020-02-27 15:20 ` Eric W. Biederman 2020-02-26 18:05 ` [PATCH v2 10/19] arm64: mte: Handle synchronous and asynchronous tag check faults Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-27 11:50 ` Catalin Marinas 2020-02-27 11:50 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 11/19] mm: Introduce arch_calc_vm_flag_bits() Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 12/19] arm64: mte: Add PROT_MTE support to mmap() and mprotect() Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 13/19] mm: Introduce arch_validate_flags() Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 14/19] arm64: mte: Validate the PROT_MTE request via arch_validate_flags() Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 15/19] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 16/19] arm64: mte: Allow user control of the tag check mode via prctl() Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-03-09 13:53 ` Kevin Brodsky 2020-03-09 13:53 ` Kevin Brodsky 2020-02-26 18:05 ` [PATCH v2 17/19] arm64: mte: Allow user control of the generated random tags " Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 18/19] arm64: mte: Kconfig entry Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-02-26 18:05 ` [PATCH v2 19/19] arm64: mte: Add Memory Tagging Extension documentation Catalin Marinas 2020-02-26 18:05 ` Catalin Marinas 2020-03-09 14:30 ` Kevin Brodsky 2020-03-09 14:30 ` Kevin Brodsky 2020-03-11 22:17 ` Richard Henderson 2020-03-11 22:17 ` Richard Henderson 2020-03-12 9:50 ` Catalin Marinas 2020-03-12 9:50 ` Catalin Marinas
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