linux-user/aarch64: Clear tpidr2_el0 if CLONE_SETTLS

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-34-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

linux-user/aarch64/target_cpu.h

@@ -34,10 +34,13 @@ static inline void cpu_clone_regs_parent(CPUARMState *env, unsigned flags)
 
 static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
 {
-    /* Note that AArch64 Linux keeps the TLS pointer in TPIDR; this is
+    /*
+     * Note that AArch64 Linux keeps the TLS pointer in TPIDR; this is
      * different from AArch32 Linux, which uses TPIDRRO.
      */
     env->cp15.tpidr_el[0] = newtls;
+    /* TPIDR2_EL0 is cleared with CLONE_SETTLS. */
+    env->cp15.tpidr2_el0 = 0;
 }
 
 static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)