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From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org,
	Will Deacon <will@kernel.org>,
	Dave P Martin <Dave.Martin@arm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Szabolcs Nagy <szabolcs.nagy@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Peter Collingbourne <pcc@google.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v9 28/29] arm64: mte: Kconfig entry
Date: Fri,  4 Sep 2020 11:30:28 +0100	[thread overview]
Message-ID: <20200904103029.32083-29-catalin.marinas@arm.com> (raw)
In-Reply-To: <20200904103029.32083-1-catalin.marinas@arm.com>

From: Vincenzo Frascino <vincenzo.frascino@arm.com>

Add Memory Tagging Extension support to the arm64 kbuild.

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>
Cc: Will Deacon <will@kernel.org>
---

Notes:
    v9:
    - Slight improvement on the ARM64_AS_HAS_MTE comment.
    
    v7:
    - Binutils gained initial support for MTE in 2.32.0. However, a late
      architecture addition (LDGM/STGM) is only supported in the newer
      2.32.x and 2.33 versions. Change the AS_HAS_MTE option to also check
      for stgm in addition to .arch armv8.5-a+memtag.
    
    v6:
    - Remove select ARCH_USES_PG_ARCH_2, no longer defined.
    
    v5:
    - Remove duplicate ARMv8.5 menu entry.
    
    v4:
    - select ARCH_USES_PG_ARCH_2.
    - remove ARCH_NO_SWAP.
    - default y.

 arch/arm64/Kconfig | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d232837cbee..e7450fbd0aa7 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1664,6 +1664,39 @@ config ARCH_RANDOM
 	  provides a high bandwidth, cryptographically secure
 	  hardware random number generator.
 
+config ARM64_AS_HAS_MTE
+	# Initial support for MTE went in binutils 2.32.0, checked with
+	# ".arch armv8.5-a+memtag" below. However, this was incomplete
+	# as a late addition to the final architecture spec (LDGM/STGM)
+	# is only supported in the newer 2.32.x and 2.33 binutils
+	# versions, hence the extra "stgm" instruction check below.
+	def_bool $(as-instr,.arch armv8.5-a+memtag\nstgm xzr$(comma)[x0])
+
+config ARM64_MTE
+	bool "Memory Tagging Extension support"
+	default y
+	depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI
+	select ARCH_USES_HIGH_VMA_FLAGS
+	help
+	  Memory Tagging (part of the ARMv8.5 Extensions) provides
+	  architectural support for run-time, always-on detection of
+	  various classes of memory error to aid with software debugging
+	  to eliminate vulnerabilities arising from memory-unsafe
+	  languages.
+
+	  This option enables the support for the Memory Tagging
+	  Extension at EL0 (i.e. for userspace).
+
+	  Selecting this option allows the feature to be detected at
+	  runtime. Any secondary CPU not implementing this feature will
+	  not be allowed a late bring-up.
+
+	  Userspace binaries that want to use this feature must
+	  explicitly opt in. The mechanism for the userspace is
+	  described in:
+
+	  Documentation/arm64/memory-tagging-extension.rst.
+
 endmenu
 
 config ARM64_SVE

  parent reply	other threads:[~2020-09-04 10:33 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-04 10:30 [PATCH v9 00/29] arm64: Memory Tagging Extension user-space support Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 01/29] arm64: mte: system register definitions Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 02/29] arm64: mte: Use Normal Tagged attributes for the linear map Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 03/29] arm64: mte: CPU feature detection and initial sysreg configuration Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 04/29] arm64: kvm: mte: Hide the MTE CPUID information from the guests Catalin Marinas
2020-09-04 10:46   ` Marc Zyngier
2020-09-04 10:46     ` Marc Zyngier
2020-09-04 10:30 ` [PATCH v9 05/29] arm64: mte: Add specific SIGSEGV codes Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 06/29] arm64: mte: Handle synchronous and asynchronous tag check faults Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 07/29] mm: Add PG_arch_2 page flag Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 08/29] mm: Preserve the PG_arch_2 flag in __split_huge_page_tail() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 09/29] arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE Catalin Marinas
2020-09-10 10:23   ` Steven Price
2020-09-10 10:23     ` Steven Price
2020-09-10 10:52     ` Catalin Marinas
2020-09-10 10:52       ` Catalin Marinas
2020-09-10 11:12       ` Steven Price
2020-09-10 11:12         ` Steven Price
2020-09-10 11:55         ` Catalin Marinas
2020-09-10 11:55           ` Catalin Marinas
2020-09-10 12:43           ` Steven Price
2020-09-10 12:43             ` Steven Price
2020-09-04 10:30 ` [PATCH v9 10/29] arm64: mte: Tags-aware copy_{user_,}highpage() implementations Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 11/29] arm64: Avoid unnecessary clear_user_page() indirection Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 12/29] arm64: mte: Tags-aware aware memcmp_pages() implementation Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 13/29] mm: Introduce arch_calc_vm_flag_bits() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 14/29] arm64: mte: Add PROT_MTE support to mmap() and mprotect() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 15/29] mm: Introduce arch_validate_flags() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 16/29] arm64: mte: Validate the PROT_MTE request via arch_validate_flags() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 17/29] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 18/29] arm64: mte: Allow user control of the tag check mode via prctl() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 19/29] arm64: mte: Allow user control of the generated random tags " Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 20/29] arm64: mte: Restore the GCR_EL1 register after a suspend Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 21/29] arm64: mte: Allow {set,get}_tagged_addr_ctrl() on non-current tasks Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 22/29] arm64: mte: ptrace: Add PTRACE_{PEEK,POKE}MTETAGS support Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 23/29] arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 24/29] fs: Handle intra-page faults in copy_mount_options() Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 25/29] mm: Add arch hooks for saving/restoring tags Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 26/29] arm64: mte: Enable swap of tagged pages Catalin Marinas
2020-09-04 10:30 ` [PATCH v9 27/29] arm64: mte: Save tags when hibernating Catalin Marinas
2020-09-04 10:30 ` Catalin Marinas [this message]
2020-09-04 10:30 ` [PATCH v9 29/29] arm64: mte: Add Memory Tagging Extension documentation Catalin Marinas
2020-09-17  8:11   ` Will Deacon
2020-09-17  8:11     ` Will Deacon
2020-09-17  9:02     ` Catalin Marinas
2020-09-17  9:02       ` Catalin Marinas
2020-09-17 16:15       ` Dave Martin
2020-09-17 16:15         ` Dave Martin
2020-09-18  8:30         ` Will Deacon
2020-09-18  8:30           ` Will Deacon
2020-10-14 23:43           ` Peter Collingbourne
2020-10-14 23:43             ` Peter Collingbourne
2020-10-14 23:43             ` Peter Collingbourne
2020-10-15  8:57             ` Will Deacon
2020-10-15  8:57               ` Will Deacon
2020-10-15 11:14             ` Szabolcs Nagy
2020-10-15 11:14               ` Szabolcs Nagy
2020-09-22 16:04         ` Catalin Marinas
2020-09-22 16:04           ` Catalin Marinas
2020-09-22 15:52       ` Szabolcs Nagy
2020-09-22 15:52         ` Szabolcs Nagy
2020-09-22 16:55         ` Catalin Marinas
2020-09-22 16:55           ` Catalin Marinas
2020-09-23  9:10           ` Szabolcs Nagy
2020-09-23  9:10             ` Szabolcs Nagy
2020-09-22 12:22   ` Andrey Konovalov
2020-09-22 12:22     ` Andrey Konovalov
2020-09-22 12:22     ` Andrey Konovalov

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