[PULL 38/38] target/arm: allow writes to SCR_EL3.HXEn bit when FEAT_HCX is enabled

[Peter Maydell]

From: Evgeny Iakovlev <eiakovlev@linux.microsoft.com>

ARM trusted firmware, when built with FEAT_HCX support, sets SCR_EL3.HXEn bit
to allow EL2 to modify HCRX_EL2 register without trapping it in EL3. Qemu
uses a valid mask to clear unsupported SCR_EL3 bits when emulating SCR_EL3
write, and that mask doesn't include SCR_EL3.HXEn bit even if FEAT_HCX is
enabled and exposed to the guest. As a result EL3 writes of that bit are
ignored.

Cc: qemu-stable@nongnu.org
Signed-off-by: Evgeny Iakovlev <eiakovlev@linux.microsoft.com>
Message-id: 20230105221251.17896-4-eiakovlev@linux.microsoft.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index cee38043540..22ea8fbe368 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1866,6 +1866,9 @@ static void scr_write(CPUARMState *env, const 
ARMCPRegInfo *ri, uint64_t value)
         if (cpu_isar_feature(aa64_sme, cpu)) {
             valid_mask |= SCR_ENTP2;
         }
+        if (cpu_isar_feature(aa64_hcx, cpu)) {
+            valid_mask |= SCR_HXEN;
+        }
     } else {
         valid_mask &= ~(SCR_RW | SCR_ST);
         if (cpu_isar_feature(aa32_ras, cpu)) {
-- 
2.34.1