[mm,v10,24/42] arm64: Enable armv8.5-a asm-arch option

Message ID	ba9dc492214fea3a88e05544bb0697b3237e743e.1605305705.git.andreyknvl@google.com (mailing list archive)
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Headers	show Return-Path: <SRS0=2mdj=ET=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DEF122252 Date: Fri, 13 Nov 2020 23:15:52 +0100 In-Reply-To: <cover.1605305705.git.andreyknvl@google.com> Message-Id: <ba9dc492214fea3a88e05544bb0697b3237e743e.1605305705.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1605305705.git.andreyknvl@google.com> Subject: [PATCH mm v10 24/42] arm64: Enable armv8.5-a asm-arch option From: Andrey Konovalov <andreyknvl@google.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: Catalin Marinas <catalin.marinas@arm.com>, 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>, 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 [mm,v10,00/42] kasan: add hardware tag-based mode for arm64 [mm,v10,01/42] kasan: drop unnecessary GPL text from comment headers [mm,v10,02/42] kasan: KASAN_VMALLOC depends on KASAN_GENERIC [mm,v10,03/42] kasan: group vmalloc code [mm,v10,04/42] kasan: shadow declarations only for software modes [mm,v10,05/42] kasan: rename (un)poison_shadow to (un)poison_range [mm,v10,06/42] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* [mm,v10,07/42] kasan: only build init.c for software modes [mm,v10,08/42] kasan: split out shadow.c from common.c [mm,v10,09/42] kasan: define KASAN_MEMORY_PER_SHADOW_PAGE [mm,v10,10/42] kasan: rename report and tags files [mm,v10,11/42] kasan: don't duplicate config dependencies [mm,v10,12/42] kasan: hide invalid free check implementation [mm,v10,13/42] kasan: decode stack frame only with KASAN_STACK_ENABLE [mm,v10,14/42] kasan, arm64: only init shadow for software modes [mm,v10,15/42] kasan, arm64: only use kasan_depth for software modes [mm,v10,16/42] kasan, arm64: move initialization message [mm,v10,17/42] kasan, arm64: rename kasan_init_tags and mark as __init [mm,v10,18/42] kasan: rename addr_has_shadow to addr_has_metadata [mm,v10,19/42] kasan: rename print_shadow_for_address to print_memory_metadata [mm,v10,20/42] kasan: rename SHADOW layout macros to META [mm,v10,21/42] kasan: separate metadata_fetch_row for each mode [mm,v10,22/42] kasan, arm64: don't allow SW_TAGS with ARM64_MTE [mm,v10,23/42] kasan: introduce CONFIG_KASAN_HW_TAGS [mm,v10,24/42] arm64: Enable armv8.5-a asm-arch option [mm,v10,25/42] arm64: mte: Add in-kernel MTE helpers [mm,v10,26/42] arm64: mte: Reset the page tag in page->flags [mm,v10,27/42] arm64: mte: Add in-kernel tag fault handler [mm,v10,28/42] arm64: kasan: Allow enabling in-kernel MTE [mm,v10,29/42] arm64: mte: Convert gcr_user into an exclude mask [mm,v10,30/42] arm64: mte: Switch GCR_EL1 in kernel entry and exit [mm,v10,31/42] kasan, mm: untag page address in free_reserved_area [mm,v10,32/42] arm64: kasan: Align allocations for HW_TAGS [mm,v10,33/42] arm64: kasan: Add arch layer for memory tagging helpers [mm,v10,34/42] kasan: define KASAN_GRANULE_SIZE for HW_TAGS [mm,v10,35/42] kasan, x86, s390: update undef CONFIG_KASAN [mm,v10,36/42] kasan, arm64: expand CONFIG_KASAN checks [mm,v10,37/42] kasan, arm64: implement HW_TAGS runtime [mm,v10,38/42] kasan, arm64: print report from tag fault handler [mm,v10,39/42] kasan, mm: reset tags when accessing metadata [mm,v10,40/42] kasan, arm64: enable CONFIG_KASAN_HW_TAGS [mm,v10,41/42] kasan: add documentation for hardware tag-based mode [mm,v10,42/42] kselftest/arm64: Check GCR_EL1 after context switch

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Subject: [PATCH mm v10 24/42] arm64: Enable armv8.5-a asm-arch option
From: Andrey Konovalov <andreyknvl@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
 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>,
	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. 13, 2020, 10:15 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(+)

Comments

Alexander Potapenko Nov. 18, 2020, 3:48 p.m. UTC | #1

On Fri, Nov 13, 2020 at 11:17 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> 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>
Reviewed-by: Alexander Potapenko <glider@google.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 c999da4f2bdd..b7d1f1a5705d 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)"'
> --
> 2.29.2.299.gdc1121823c-goog
>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c999da4f2bdd..b7d1f1a5705d 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)"'

[mm,v10,24/42] arm64: Enable armv8.5-a asm-arch option

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