6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rob Herring <robh@xxxxxxxxxx> commit f827bcdafa2a2ac21c91e47f587e8d0c76195409 upstream. Implement the workaround for ARM Cortex-A510 erratum 3117295. On an affected Cortex-A510 core, a speculatively executed unprivileged load might leak data from a privileged load via a cache side channel. The issue only exists for loads within a translation regime with the same translation (e.g. same ASID and VMID). Therefore, the issue only affects the return to EL0. The erratum and workaround are the same as ARM Cortex-A520 erratum 2966298, so reuse the existing workaround. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Rob Herring <robh@xxxxxxxxxx> Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx> Link: https://lore.kernel.org/r/20240110-arm-errata-a510-v1-2-d02bc51aeeee@xxxxxxxxxx Signed-off-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Documentation/arch/arm64/silicon-errata.rst | 2 ++ arch/arm64/Kconfig | 14 ++++++++++++++ arch/arm64/kernel/cpu_errata.c | 17 +++++++++++++++-- 3 files changed, 31 insertions(+), 2 deletions(-) --- a/Documentation/arch/arm64/silicon-errata.rst +++ b/Documentation/arch/arm64/silicon-errata.rst @@ -71,6 +71,8 @@ stable kernels. +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A510 | #2658417 | ARM64_ERRATUM_2658417 | +----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A510 | #3117295 | ARM64_ERRATUM_3117295 | ++----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A520 | #2966298 | ARM64_ERRATUM_2966298 | +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 | --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1054,6 +1054,20 @@ config ARM64_ERRATUM_2966298 If unsure, say Y. +config ARM64_ERRATUM_3117295 + bool "Cortex-A510: 3117295: workaround for speculatively executed unprivileged load" + select ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD + default y + help + This option adds the workaround for ARM Cortex-A510 erratum 3117295. + + On an affected Cortex-A510 core, a speculatively executed unprivileged + load might leak data from a privileged level via a cache side channel. + + Work around this problem by executing a TLBI before returning to EL0. + + If unsure, say Y. + config CAVIUM_ERRATUM_22375 bool "Cavium erratum 22375, 24313" default y --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -432,6 +432,19 @@ static struct midr_range broken_aarch32_ }; #endif /* CONFIG_ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE */ +#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD +static const struct midr_range erratum_spec_unpriv_load_list[] = { +#ifdef CONFIG_ARM64_ERRATUM_3117295 + MIDR_ALL_VERSIONS(MIDR_CORTEX_A510), +#endif +#ifdef CONFIG_ARM64_ERRATUM_2966298 + /* Cortex-A520 r0p0 to r0p1 */ + MIDR_REV_RANGE(MIDR_CORTEX_A520, 0, 0, 1), +#endif + {}, +}; +#endif + const struct arm64_cpu_capabilities arm64_errata[] = { #ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE { @@ -732,10 +745,10 @@ const struct arm64_cpu_capabilities arm6 #endif #ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD { - .desc = "ARM erratum 2966298", + .desc = "ARM errata 2966298, 3117295", .capability = ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD, /* Cortex-A520 r0p0 - r0p1 */ - ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A520, 0, 0, 1), + ERRATA_MIDR_RANGE_LIST(erratum_spec_unpriv_load_list), }, #endif #ifdef CONFIG_AMPERE_ERRATUM_AC03_CPU_38
