[v9,26/44] arm64: Enable armv8.5-a asm-arch option

Message ID	e7f69b87c86266c3671ec137f56e7740890155d3.1605046192.git.andreyknvl@google.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=ew8G=EQ=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF13C20637 Date: Tue, 10 Nov 2020 23:10:23 +0100 In-Reply-To: <cover.1605046192.git.andreyknvl@google.com> Message-Id: <e7f69b87c86266c3671ec137f56e7740890155d3.1605046192.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1605046192.git.andreyknvl@google.com> Subject: [PATCH v9 26/44] arm64: Enable armv8.5-a asm-arch option From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com>, Vincenzo Frascino <vincenzo.frascino@arm.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>, Branislav Rankov <Branislav.Rankov@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Andrew Morton <akpm@linux-foundation.org>, kasan-dev@googlegroups.com, 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 [v9,00/44] kasan: add hardware tag-based mode for arm64 [v9,01/44] kasan: drop unnecessary GPL text from comment headers [v9,02/44] kasan: KASAN_VMALLOC depends on KASAN_GENERIC [v9,03/44] kasan: group vmalloc code [v9,04/44] s390/kasan: include asm/page.h from asm/kasan.h [v9,05/44] kasan: shadow declarations only for software modes [v9,06/44] kasan: rename (un)poison_shadow to (un)poison_memory [v9,07/44] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* [v9,08/44] kasan: only build init.c for software modes [v9,09/44] kasan: split out shadow.c from common.c [v9,10/44] kasan: define KASAN_GRANULE_PAGE [v9,11/44] kasan: rename report and tags files [v9,12/44] kasan: don't duplicate config dependencies [v9,13/44] kasan: hide invalid free check implementation [v9,14/44] kasan: decode stack frame only with KASAN_STACK_ENABLE [v9,15/44] kasan, arm64: only init shadow for software modes [v9,16/44] kasan, arm64: only use kasan_depth for software modes [v9,17/44] kasan, arm64: move initialization message [v9,18/44] kasan, arm64: rename kasan_init_tags and mark as __init [v9,19/44] kasan: rename addr_has_shadow to addr_has_metadata [v9,20/44] kasan: rename print_shadow_for_address to print_memory_metadata [v9,21/44] kasan: kasan_non_canonical_hook only for software modes [v9,22/44] kasan: rename SHADOW layout macros to META [v9,23/44] kasan: separate metadata_fetch_row for each mode [v9,24/44] kasan, arm64: don't allow SW_TAGS with ARM64_MTE [v9,25/44] kasan: introduce CONFIG_KASAN_HW_TAGS [v9,26/44] arm64: Enable armv8.5-a asm-arch option [v9,27/44] arm64: mte: Add in-kernel MTE helpers [v9,28/44] arm64: mte: Reset the page tag in page->flags [v9,29/44] arm64: mte: Add in-kernel tag fault handler [v9,30/44] arm64: kasan: Allow enabling in-kernel MTE [v9,31/44] arm64: mte: Convert gcr_user into an exclude mask [v9,32/44] arm64: mte: Switch GCR_EL1 in kernel entry and exit [v9,33/44] kasan, mm: untag page address in free_reserved_area [v9,34/44] arm64: kasan: Align allocations for HW_TAGS [v9,35/44] arm64: kasan: Add arch layer for memory tagging helpers [v9,36/44] kasan: define KASAN_GRANULE_SIZE for HW_TAGS [v9,37/44] kasan, x86, s390: update undef CONFIG_KASAN [v9,38/44] kasan, arm64: expand CONFIG_KASAN checks [v9,39/44] kasan, arm64: implement HW_TAGS runtime [v9,40/44] kasan, arm64: print report from tag fault handler [v9,41/44] kasan, mm: reset tags when accessing metadata [v9,42/44] kasan, arm64: enable CONFIG_KASAN_HW_TAGS [v9,43/44] kasan: add documentation for hardware tag-based mode [v9,44/44] kselftest/arm64: Check GCR_EL1 after context switch

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Subject: [PATCH v9 26/44] arm64: Enable armv8.5-a asm-arch option
From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>,
 Vincenzo Frascino <vincenzo.frascino@arm.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>,
 Branislav Rankov <Branislav.Rankov@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
 Andrew Morton <akpm@linux-foundation.org>,
	kasan-dev@googlegroups.com, 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
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Series

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

Commit Message

Andrey Konovalov Nov. 10, 2020, 10:10 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 25ead11074bf..c84a0e6b4650 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1591,6 +1591,9 @@  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
@@ -1665,6 +1668,7 @@  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)"'

[v9,26/44] arm64: Enable armv8.5-a asm-arch option

Commit Message

Patch