diff options
| author | D Scott Phillips <scott@os.amperecomputing.com> | 2025-05-13 11:45:14 -0700 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-05-19 12:46:26 +0100 |
| commit | fed55f49fad181be9dfb93c06efc4ab2b71a72a9 (patch) | |
| tree | c9059e72c2dccec0c2e34d5198aa74901a1771da /arch/arm64/kernel/cpu_errata.c | |
| parent | 92c749e4aa90cd684d87cb5bde6a9d51e83fe6e3 (diff) | |
arm64: errata: Work around AmpereOne's erratum AC04_CPU_23
On AmpereOne AC04, updates to HCR_EL2 can rarely corrupt simultaneous
translations for data addresses initiated by load/store instructions.
Only instruction initiated translations are vulnerable, not translations
from prefetches for example. A DSB before the store to HCR_EL2 is
sufficient to prevent older instructions from hitting the window for
corruption, and an ISB after is sufficient to prevent younger
instructions from hitting the window for corruption.
Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20250513184514.2678288-1-scott@os.amperecomputing.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index b55f5f705750..60f1b70fc084 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -557,6 +557,13 @@ static const struct midr_range erratum_ac03_cpu_38_list[] = { }; #endif +#ifdef CONFIG_AMPERE_ERRATUM_AC04_CPU_23 +static const struct midr_range erratum_ac04_cpu_23_list[] = { + MIDR_ALL_VERSIONS(MIDR_AMPERE1A), + {}, +}; +#endif + const struct arm64_cpu_capabilities arm64_errata[] = { #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE { @@ -876,6 +883,13 @@ const struct arm64_cpu_capabilities arm64_errata[] = { ERRATA_MIDR_RANGE_LIST(erratum_ac03_cpu_38_list), }, #endif +#ifdef CONFIG_AMPERE_ERRATUM_AC04_CPU_23 + { + .desc = "AmpereOne erratum AC04_CPU_23", + .capability = ARM64_WORKAROUND_AMPERE_AC04_CPU_23, + ERRATA_MIDR_RANGE_LIST(erratum_ac04_cpu_23_list), + }, +#endif { .desc = "Broken CNTVOFF_EL2", .capability = ARM64_WORKAROUND_QCOM_ORYON_CNTVOFF, |