[v6,01/40] arm64: Enable armv8.5-a asm-arch option

Message ID	15c4e9480d957318797d39d0ac1aae08f9efcb18.1603999489.git.andreyknvl@google.com (mailing list archive)
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Headers	show Return-Path: <SRS0=bvI/=EE=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0BB220796 Date: Thu, 29 Oct 2020 20:25:22 +0100 In-Reply-To: <cover.1603999489.git.andreyknvl@google.com> Message-Id: <15c4e9480d957318797d39d0ac1aae08f9efcb18.1603999489.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1603999489.git.andreyknvl@google.com> Subject: [PATCH v6 01/40] arm64: Enable armv8.5-a asm-arch option From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>, kasan-dev@googlegroups.com, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Evgenii Stepanov <eugenis@google.com>, Elena Petrova <lenaptr@google.com>, Branislav Rankov <Branislav.Rankov@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	kasan: add hardware tag-based mode for arm64 \| expand [v6,00/40] kasan: add hardware tag-based mode for arm64 [v6,01/40] arm64: Enable armv8.5-a asm-arch option [v6,02/40] arm64: mte: Add in-kernel MTE helpers [v6,03/40] arm64: mte: Reset the page tag in page->flags [v6,04/40] arm64: kasan: Add arch layer for memory tagging helpers [v6,05/40] arm64: mte: Add in-kernel tag fault handler [v6,06/40] arm64: kasan: Enable in-kernel MTE [v6,07/40] arm64: mte: Convert gcr_user into an exclude mask [v6,08/40] arm64: mte: Switch GCR_EL1 in kernel entry and exit [v6,09/40] arm64: kasan: Align allocations for HW_TAGS [v6,10/40] kasan: drop unnecessary GPL text from comment headers [v6,11/40] kasan: KASAN_VMALLOC depends on KASAN_GENERIC [v6,12/40] kasan: group vmalloc code [v6,13/40] kasan: shadow declarations only for software modes [v6,14/40] kasan: rename (un)poison_shadow to (un)poison_memory [v6,15/40] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* [v6,16/40] kasan: only build init.c for software modes [v6,17/40] kasan: split out shadow.c from common.c [v6,18/40] kasan: define KASAN_GRANULE_PAGE [v6,19/40] kasan: rename report and tags files [v6,20/40] kasan: don't duplicate config dependencies [v6,21/40] kasan: hide invalid free check implementation [v6,22/40] kasan: decode stack frame only with KASAN_STACK_ENABLE [v6,23/40] kasan, arm64: only init shadow for software modes [v6,24/40] kasan, arm64: only use kasan_depth for software modes [v6,25/40] kasan: rename addr_has_shadow to addr_has_metadata [v6,26/40] kasan: rename print_shadow_for_address to print_memory_metadata [v6,27/40] kasan: kasan_non_canonical_hook only for software modes [v6,28/40] kasan: rename SHADOW layout macros to META [v6,29/40] kasan: separate metadata_fetch_row for each mode [v6,30/40] kasan, arm64: don't allow SW_TAGS with ARM64_MTE [v6,31/40] kasan: introduce CONFIG_KASAN_HW_TAGS [v6,32/40] kasan: define KASAN_GRANULE_SIZE for HW_TAGS [v6,33/40] kasan, x86, s390: update undef CONFIG_KASAN [v6,34/40] kasan, arm64: expand CONFIG_KASAN checks [v6,35/40] kasan, arm64: implement HW_TAGS runtime [v6,36/40] kasan, arm64: print report from tag fault handler [v6,37/40] kasan, mm: reset tags when accessing metadata [v6,38/40] kasan, arm64: enable CONFIG_KASAN_HW_TAGS [v6,39/40] kasan: add documentation for hardware tag-based mode [v6,40/40] kselftest/arm64: Check GCR_EL1 after context switch

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Subject: [PATCH v6 01/40] arm64: Enable armv8.5-a asm-arch option
From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
 Will Deacon <will.deacon@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>, kasan-dev@googlegroups.com,
	Dmitry Vyukov <dvyukov@google.com>,
 Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>,
	Evgenii Stepanov <eugenis@google.com>, Elena Petrova <lenaptr@google.com>,
	Branislav Rankov <Branislav.Rankov@arm.com>,
 Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
 linux-arm-kernel@lists.infradead.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrey Konovalov <andreyknvl@google.com>
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Series

kasan: add hardware tag-based mode for arm64 | expand

Commit Message

Andrey Konovalov Oct. 29, 2020, 7:25 p.m. UTC

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

Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) which
is an armv8.5-a architecture extension.

Enable the correct asm option when the compiler supports it in order to
allow the usage of ALTERNATIVE()s with MTE instructions.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
Change-Id: I172e15e4c189f073e4c14a10276b276092e76536
---
 arch/arm64/Kconfig  | 4 ++++
 arch/arm64/Makefile | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f858c352f72a..9f13ab297b7a 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1571,6 +1571,9 @@  endmenu
 
 menu "ARMv8.5 architectural features"
 
+config AS_HAS_ARMV8_5
+	def_bool $(cc-option,-Wa$(comma)-march=armv8.5-a)
+
 config ARM64_BTI
 	bool "Branch Target Identification support"
 	default y
@@ -1645,6 +1648,7 @@  config ARM64_MTE
 	bool "Memory Tagging Extension support"
 	default y
 	depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI
+	depends on AS_HAS_ARMV8_5
 	select ARCH_USES_HIGH_VMA_FLAGS
 	help
 	  Memory Tagging (part of the ARMv8.5 Extensions) provides
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 5789c2d18d43..50ad9cbccb51 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -100,6 +100,11 @@  ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
 asm-arch := armv8.4-a
 endif
 
+ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
+# make sure to pass the newest target architecture to -march.
+asm-arch := armv8.5-a
+endif
+
 ifdef asm-arch
 KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
 		   -DARM64_ASM_ARCH='"$(asm-arch)"'

[v6,01/40] arm64: Enable armv8.5-a asm-arch option

Commit Message

Patch