Re: [PATCH v3 07/25] arm64: enable the Permission Overlay Extension for EL0

On Fri, Nov 24, 2023 at 04:34:52PM +0000, Joey Gouly wrote:

+#ifdef CONFIG_ARM64_POE +static void cpu_enable_poe(const struct arm64_cpu_capabilities *__unused) +{

• sysreg_clear_set(REG_TCR2_EL1, 0, TCR2_EL1x_E0POE);
• sysreg_clear_set(CPACR_EL1, 0, CPACR_ELx_E0POE);

+} +#endif

Don't we need the TCR2_EL1x.POE bit (for EL1) enabled as well? I'm thinking of the LDXR/STXR instructions accessing user memory (the futex code).