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
next prev parent reply other threads:[~2020-09-04 10:33 UTC|newest]
Thread overview: 48+ 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 10:30 ` [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 10:52 ` Catalin Marinas
2020-09-10 11:12 ` Steven Price
2020-09-10 11:55 ` Catalin Marinas
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 9:02 ` Catalin Marinas
2020-09-17 16:15 ` Dave Martin
2020-09-18 8:30 ` Will Deacon
2020-10-14 23:43 ` Peter Collingbourne
2020-10-15 8:57 ` Will Deacon
2020-10-15 11:14 ` Szabolcs Nagy
2020-09-22 16:04 ` Catalin Marinas
2020-09-22 15:52 ` Szabolcs Nagy
2020-09-22 16:55 ` Catalin Marinas
2020-09-23 9:10 ` Szabolcs Nagy
2020-09-22 12:22 ` Andrey Konovalov
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