[PULL 6/7] hw/arm/boot: Fix MTE for EL3 direct kernel boot

[Peter Maydell]

From: Richard Henderson <richard.henderson@linaro.org>

When booting an EL3 cpu with -kernel, we set up EL3 and then
drop down to EL2.  We need to enable access to v8.5-MemTag
tag allocation at EL3 before doing so.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200724163853.504655-3-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/boot.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index c44fd3382dd..3e9816af803 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -739,6 +739,9 @@ static void do_cpu_reset(void *opaque)
                     if (cpu_isar_feature(aa64_pauth, cpu)) {
                         env->cp15.scr_el3 |= SCR_API | SCR_APK;
                     }
+                    if (cpu_isar_feature(aa64_mte, cpu)) {
+                        env->cp15.scr_el3 |= SCR_ATA;
+                    }
                     /* AArch64 kernels never boot in secure mode */
                     assert(!info->secure_boot);
                     /* This hook is only supported for AArch32 currently:
-- 
2.20.1