arm64: errata: Mitigate TLBI errata on NVIDIA Olympus CPU

jira VULN-187521
cve CVE-2025-10263
commit-author Shanker Donthineni <sdonthineni@nvidia.com>
commit ec7216f

NVIDIA Olympus CPU core is affected by the same TLBI errata as several
ARM CPU cores. The TLBI;DSB sequence might complete before the global
observation of writes which are translated by an affected TLB entry,
identified as erratum T410-OLY-1029. This has been assigned CVE ID
CVE-2025-10263.

Leverage the existing ARM64_ERRATUM_4118414 mitigation, which enables
the ARM64_WORKAROUND_REPEAT_TLBI capability for affected CPUs, to
ensure memory write effects are globally observed.

Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
(cherry picked from commit ec7216f)
Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Author: bmastbergen

Documentation/arm64/silicon-errata.rst

@@ -206,6 +206,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | NVIDIA         | Carmel Core     | N/A             | NVIDIA_CARMEL_CNP_ERRATUM   |
 +----------------+-----------------+-----------------+-----------------------------+
+| NVIDIA         | Olympus core    | T410-OLY-1029   | ARM64_ERRATUM_4118414       |
++----------------+-----------------+-----------------+-----------------------------+
 | NVIDIA         | T241 GICv3/4.x  | T241-FABRIC-4   | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
 +----------------+-----------------+-----------------+-----------------------------+

arch/arm64/Kconfig

@@ -907,7 +907,7 @@ config ARM64_ERRATUM_1902691
 	  If unsure, say Y.
 
 config ARM64_ERRATUM_4118414
-	bool "Cortex-*/Neoverse-*/C1-*: Completion of affected memory accesses might not be guaranteed by completion of a TLBI"
+	bool "Various: Completion of affected memory accesses might not be guaranteed by completion of a TLBI"
 	default y
 	select ARM64_WORKAROUND_REPEAT_TLBI
 	help
@@ -934,6 +934,7 @@ config ARM64_ERRATUM_4118414
 	  * ARM Neoverse-V2 erratum 4193787
 	  * ARM Neoverse-V3 erratum 4193784
 	  * ARM Neoverse-V3AE erratum 4193784
+	  * NVIDIA Olympus erratum T410-OLY-1029
 
 	  On affected cores, some memory accesses might not be completed by
 	  broadcast TLB invalidation.

arch/arm64/kernel/cpu_errata.c

@@ -242,6 +242,7 @@ static const struct arm64_cpu_capabilities arm64_repeat_tlbi_list[] = {
 			MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V2),
 			MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3),
 			MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V3AE),
+			MIDR_ALL_VERSIONS(MIDR_NVIDIA_OLYMPUS),
 			{}
 		})),
 	},