[PATCH 5.4-6.17 0/2] arm64: errata: Apply workarounds for Neoverse-V3AE

[PATCH 5.4-6.17 0/2] arm64: errata: Apply workarounds for Neoverse-V3AE

[Ryan Roberts]

Hi All,

This series is a backport intended for all supported stable kernels (5.4-6.17)
of the recent errata workarounds for Neoverse-V3AE, which were originally posted
at:

  https://lore.kernel.org/all/20250919145832.4035534-1-ryan.roberts@arm.com/

... and were originally merged upstream in v6.18-rc1.

I've tested that these patches apply to 5.4-6.12 without issue, but there is a
trivial conflict to resolve in silicon-errata.rst for it to apply to 6.16 and
6.17. Are you happy to deal with that or should I send a separate series?

Thanks,
Ryan

Mark Rutland (2):
  arm64: cputype: Add Neoverse-V3AE definitions
  arm64: errata: Apply workarounds for Neoverse-V3AE

 Documentation/arch/arm64/silicon-errata.rst | 2 ++
 arch/arm64/Kconfig                          | 1 +
 arch/arm64/include/asm/cputype.h            | 2 ++
 arch/arm64/kernel/cpu_errata.c              | 1 +
 4 files changed, 6 insertions(+)

--
2.43.0

[PATCH 5.4-6.17 1/2] arm64: cputype: Add Neoverse-V3AE definitions

[Ryan Roberts]

From: Mark Rutland <mark.rutland@arm.com>

[ Upstream commit 3bbf004c4808e2c3241e5c1ad6cc102f38a03c39 ]

Add cputype definitions for Neoverse-V3AE. These will be used for errata
detection in subsequent patches.

These values can be found in the Neoverse-V3AE TRM:

  https://developer.arm.com/documentation/SDEN-2615521/9-0/

... in section A.6.1 ("MIDR_EL1, Main ID Register").

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[ Ryan: Trivial backport ]
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
 arch/arm64/include/asm/cputype.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index d92a0203e5a9..c279a0a9b366 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -93,6 +93,7 @@
 #define ARM_CPU_PART_NEOVERSE_V2	0xD4F
 #define ARM_CPU_PART_CORTEX_A720	0xD81
 #define ARM_CPU_PART_CORTEX_X4		0xD82
+#define ARM_CPU_PART_NEOVERSE_V3AE	0xD83
 #define ARM_CPU_PART_NEOVERSE_V3	0xD84
 #define ARM_CPU_PART_CORTEX_X925	0xD85
 #define ARM_CPU_PART_CORTEX_A725	0xD87
@@ -180,6 +181,7 @@
 #define MIDR_NEOVERSE_V2 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V2)
 #define MIDR_CORTEX_A720 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A720)
 #define MIDR_CORTEX_X4 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_X4)
+#define MIDR_NEOVERSE_V3AE	MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V3AE)
 #define MIDR_NEOVERSE_V3 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V3)
 #define MIDR_CORTEX_X925 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_X925)
 #define MIDR_CORTEX_A725 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A725)
--
2.43.0

[PATCH 5.4-6.17 2/2] arm64: errata: Apply workarounds for Neoverse-V3AE

[Ryan Roberts]

From: Mark Rutland <mark.rutland@arm.com>

[ Upstream commit 0c33aa1804d101c11ba1992504f17a42233f0e11 ]

Neoverse-V3AE is also affected by erratum #3312417, as described in its
Software Developer Errata Notice (SDEN) document:

  Neoverse V3AE (MP172) SDEN v9.0, erratum 3312417
  https://developer.arm.com/documentation/SDEN-2615521/9-0/

Enable the workaround for Neoverse-V3AE, and document this.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[ Ryan: Trivial backport ]
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
 Documentation/arch/arm64/silicon-errata.rst | 2 ++
 arch/arm64/Kconfig                          | 1 +
 arch/arm64/kernel/cpu_errata.c              | 1 +
 3 files changed, 4 insertions(+)

diff --git a/Documentation/arch/arm64/silicon-errata.rst b/Documentation/arch/arm64/silicon-errata.rst
index b42fea07c5ce..b6dacd012539 100644
--- a/Documentation/arch/arm64/silicon-errata.rst
+++ b/Documentation/arch/arm64/silicon-errata.rst
@@ -198,6 +198,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-V3     | #3312417        | ARM64_ERRATUM_3194386       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Neoverse-V3AE   | #3312417        | ARM64_ERRATUM_3194386       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-500         | #841119,826419  | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-600         | #1076982,1209401| N/A                         |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7887d18cce3e..40ae4dd961b1 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1111,6 +1111,7 @@ config ARM64_ERRATUM_3194386
 	  * ARM Neoverse-V1 erratum 3324341
 	  * ARM Neoverse V2 erratum 3324336
 	  * ARM Neoverse-V3 erratum 3312417
+	  * ARM Neoverse-V3AE erratum 3312417

 	  On affected cores "MSR SSBS, #0" instructions may not affect
 	  subsequent speculative instructions, which may permit unexepected
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index a78f247029ae..3f675ae57d09 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -455,6 +455,7 @@ static const struct midr_range erratum_spec_ssbs_list[] = {
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V1),
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V2),
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3),
+	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3AE),
 	{}
 };
 #endif
--
2.43.0

Re: [PATCH 5.4-6.17 0/2] arm64: errata: Apply workarounds for Neoverse-V3AE

[Greg KH]

On Thu, Oct 16, 2025 at 12:12:04PM +0100, Ryan Roberts wrote:
> Hi All,
> 
> This series is a backport intended for all supported stable kernels (5.4-6.17)
> of the recent errata workarounds for Neoverse-V3AE, which were originally posted
> at:
> 
>   https://lore.kernel.org/all/20250919145832.4035534-1-ryan.roberts@arm.com/
> 
> ... and were originally merged upstream in v6.18-rc1.
> 
> I've tested that these patches apply to 5.4-6.12 without issue, but there is a
> trivial conflict to resolve in silicon-errata.rst for it to apply to 6.16 and
> 6.17. Are you happy to deal with that or should I send a separate series?

Please resend a separate series for that, and then resend this series as
well, marked for the specific kernel releases that they are for.

thanks,

greg k-h

Patch "arm64: cputype: Add Neoverse-V3AE definitions" has been added to the 6.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: cputype: Add Neoverse-V3AE definitions

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-cputype-add-neoverse-v3ae-definitions.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-186003-greg=kroah.com@vger.kernel.org Thu Oct 16 13:12:49 2025
From: Ryan Roberts <ryan.roberts@arm.com>
Date: Thu, 16 Oct 2025 12:12:05 +0100
Subject: arm64: cputype: Add Neoverse-V3AE definitions
To: stable@vger.kernel.org
Cc: Ryan Roberts <ryan.roberts@arm.com>, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>
Message-ID: <20251016111208.3983300-2-ryan.roberts@arm.com>

From: Mark Rutland <mark.rutland@arm.com>

[ Upstream commit 3bbf004c4808e2c3241e5c1ad6cc102f38a03c39 ]

Add cputype definitions for Neoverse-V3AE. These will be used for errata
detection in subsequent patches.

These values can be found in the Neoverse-V3AE TRM:

  https://developer.arm.com/documentation/SDEN-2615521/9-0/

... in section A.6.1 ("MIDR_EL1, Main ID Register").

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[ Ryan: Trivial backport ]
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm64/include/asm/cputype.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -93,6 +93,7 @@
 #define ARM_CPU_PART_NEOVERSE_V2	0xD4F
 #define ARM_CPU_PART_CORTEX_A720	0xD81
 #define ARM_CPU_PART_CORTEX_X4		0xD82
+#define ARM_CPU_PART_NEOVERSE_V3AE	0xD83
 #define ARM_CPU_PART_NEOVERSE_V3	0xD84
 #define ARM_CPU_PART_CORTEX_X925	0xD85
 #define ARM_CPU_PART_CORTEX_A725	0xD87
@@ -180,6 +181,7 @@
 #define MIDR_NEOVERSE_V2 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V2)
 #define MIDR_CORTEX_A720 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A720)
 #define MIDR_CORTEX_X4 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_X4)
+#define MIDR_NEOVERSE_V3AE	MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V3AE)
 #define MIDR_NEOVERSE_V3 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_NEOVERSE_V3)
 #define MIDR_CORTEX_X925 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_X925)
 #define MIDR_CORTEX_A725 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A725)


Patches currently in stable-queue which might be from ryan.roberts@arm.com are

queue-6.12/arm64-cputype-add-neoverse-v3ae-definitions.patch
queue-6.12/mm-thp-fix-mte-tag-mismatch-when-replacing-zero-filled-subpages.patch
queue-6.12/arm64-errata-apply-workarounds-for-neoverse-v3ae.patch

Patch "arm64: errata: Apply workarounds for Neoverse-V3AE" has been added to the 6.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: errata: Apply workarounds for Neoverse-V3AE

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-errata-apply-workarounds-for-neoverse-v3ae.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-186004-greg=kroah.com@vger.kernel.org Thu Oct 16 13:12:53 2025
From: Ryan Roberts <ryan.roberts@arm.com>
Date: Thu, 16 Oct 2025 12:12:06 +0100
Subject: arm64: errata: Apply workarounds for Neoverse-V3AE
To: stable@vger.kernel.org
Cc: Ryan Roberts <ryan.roberts@arm.com>, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>
Message-ID: <20251016111208.3983300-3-ryan.roberts@arm.com>

From: Mark Rutland <mark.rutland@arm.com>

[ Upstream commit 0c33aa1804d101c11ba1992504f17a42233f0e11 ]

Neoverse-V3AE is also affected by erratum #3312417, as described in its
Software Developer Errata Notice (SDEN) document:

  Neoverse V3AE (MP172) SDEN v9.0, erratum 3312417
  https://developer.arm.com/documentation/SDEN-2615521/9-0/

Enable the workaround for Neoverse-V3AE, and document this.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[ Ryan: Trivial backport ]
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 Documentation/arch/arm64/silicon-errata.rst |    2 ++
 arch/arm64/Kconfig                          |    1 +
 arch/arm64/kernel/cpu_errata.c              |    1 +
 3 files changed, 4 insertions(+)

--- a/Documentation/arch/arm64/silicon-errata.rst
+++ b/Documentation/arch/arm64/silicon-errata.rst
@@ -198,6 +198,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-V3     | #3312417        | ARM64_ERRATUM_3194386       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Neoverse-V3AE   | #3312417        | ARM64_ERRATUM_3194386       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-500         | #841119,826419  | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-600         | #1076982,1209401| N/A                         |
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1111,6 +1111,7 @@ config ARM64_ERRATUM_3194386
 	  * ARM Neoverse-V1 erratum 3324341
 	  * ARM Neoverse V2 erratum 3324336
 	  * ARM Neoverse-V3 erratum 3312417
+	  * ARM Neoverse-V3AE erratum 3312417
 
 	  On affected cores "MSR SSBS, #0" instructions may not affect
 	  subsequent speculative instructions, which may permit unexepected
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -455,6 +455,7 @@ static const struct midr_range erratum_s
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V1),
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V2),
 	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3),
+	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3AE),
 	{}
 };
 #endif


Patches currently in stable-queue which might be from ryan.roberts@arm.com are

queue-6.12/arm64-cputype-add-neoverse-v3ae-definitions.patch
queue-6.12/mm-thp-fix-mte-tag-mismatch-when-replacing-zero-filled-subpages.patch
queue-6.12/arm64-errata-apply-workarounds-for-neoverse-v3ae.patch

Re: Patch "arm64: cputype: Add Neoverse-V3AE definitions" has been added to the 6.12-stable tree

[Greg KH]

On Fri, Oct 17, 2025 at 09:13:19AM +0200, gregkh@linuxfoundation.org wrote:
> 
> This is a note to let you know that I've just added the patch titled
> 
>     arm64: cputype: Add Neoverse-V3AE definitions
> 
> to the 6.12-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      arm64-cputype-add-neoverse-v3ae-definitions.patch
> and it can be found in the queue-6.12 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 

OOps, nope, dropping this one and the other one until we get a 6.17
version as well.  Sorry for the noise.

greg k-h

Re: [PATCH 5.4-6.17 0/2] arm64: errata: Apply workarounds for Neoverse-V3AE

[Ryan Roberts]

On 17/10/2025 08:08, Greg KH wrote:
> On Thu, Oct 16, 2025 at 12:12:04PM +0100, Ryan Roberts wrote:
>> Hi All,
>>
>> This series is a backport intended for all supported stable kernels (5.4-6.17)
>> of the recent errata workarounds for Neoverse-V3AE, which were originally posted
>> at:
>>
>>   https://lore.kernel.org/all/20250919145832.4035534-1-ryan.roberts@arm.com/
>>
>> ... and were originally merged upstream in v6.18-rc1.
>>
>> I've tested that these patches apply to 5.4-6.12 without issue, but there is a
>> trivial conflict to resolve in silicon-errata.rst for it to apply to 6.16 and
>> 6.17. Are you happy to deal with that or should I send a separate series?
> 
> Please resend a separate series for that, and then resend this series as
> well, marked for the specific kernel releases that they are for.

OK will do. Incoming shortly...

> 
> thanks,
> 
> greg k-h