This has been enabled in the linux kernel since v3.11
(commit d50240a5f6cea, 2013-09-03,
"arm64: mm: permit use of tagged pointers at EL0").
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
target/arm/cpu.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 3874dc9875..edf6e0e1f1 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -200,6 +200,12 @@ static void arm_cpu_reset(CPUState *s)
env->vfp.zcr_el[1] = cpu->sve_max_vq - 1;
env->vfp.zcr_el[2] = env->vfp.zcr_el[1];
env->vfp.zcr_el[3] = env->vfp.zcr_el[1];
+ /*
+ * Enable TBI0 and TBI1. While the real kernel only enables TBI0,
+ * turning on both here will produce smaller code and otherwise
+ * make no difference to the user-level emulation.
+ */
+ env->cp15.tcr_el[1].raw_tcr = (3ULL << 37);
#else
/* Reset into the highest available EL */
if (arm_feature(env, ARM_FEATURE_EL3)) {
--
2.17.2
