diff options
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index c1d44d127baa..9b05843d67af 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -53,6 +53,11 @@ * arbitrary physical CPUs, but some features not present on the host are * also advertised and emulated. Look at sys_reg_descs[] for the gory * details. + * + * - If the arm64_ftr_bits[] for a register has a missing field, then this + * field is treated as STRICT RES0, including for read_sanitised_ftr_reg(). + * This is stronger than FTR_HIDDEN and can be used to hide features from + * KVM guests. */ #define pr_fmt(fmt) "CPU features: " fmt |