[Qemu-devel] [PATCH for-4.2 23/24] target/arm: Update {fp, sve}_exception_el for VHE

[Richard Henderson <richard.henderson@linaro.org>]

When TGE+E2H are both set, CPACR_EL1 is ignored.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/helper.c | 53 ++++++++++++++++++++++++---------------------
 1 file changed, 28 insertions(+), 25 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index ae3ec9ea67..bbe36eb3a9 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5501,7 +5501,9 @@ static const ARMCPRegInfo debug_lpae_cp_reginfo[] = {
 int sve_exception_el(CPUARMState *env, int el)
 {
 #ifndef CONFIG_USER_ONLY
-    if (el <= 1) {
+    uint64_t hcr_el2 = arm_hcr_el2_eff(env);
+
+    if (el <= 1 && (hcr_el2 & (HCR_E2H | HCR_TGE)) != (HCR_E2H | HCR_TGE)) {
         bool disabled = false;
 
         /* The CPACR.ZEN controls traps to EL1:
@@ -5516,8 +5518,7 @@ int sve_exception_el(CPUARMState *env, int el)
         }
         if (disabled) {
             /* route_to_el2 */
-            return (arm_feature(env, ARM_FEATURE_EL2)
-                    && (arm_hcr_el2_eff(env) & HCR_TGE) ? 2 : 1);
+            return hcr_el2 & HCR_TGE ? 2 : 1;
         }
 
         /* Check CPACR.FPEN.  */
@@ -11212,8 +11213,6 @@ uint32_t HELPER(crc32c)(uint32_t acc, uint32_t val, uint32_t bytes)
 int fp_exception_el(CPUARMState *env, int cur_el)
 {
 #ifndef CONFIG_USER_ONLY
-    int fpen;
-
     /* CPACR and the CPTR registers don't exist before v6, so FP is
      * always accessible
      */
@@ -11241,30 +11240,34 @@ int fp_exception_el(CPUARMState *env, int cur_el)
      * 0, 2 : trap EL0 and EL1/PL1 accesses
      * 1    : trap only EL0 accesses
      * 3    : trap no accesses
+     * This register is ignored if E2H+TGE are both set.
      */
-    fpen = extract32(env->cp15.cpacr_el1, 20, 2);
-    switch (fpen) {
-    case 0:
-    case 2:
-        if (cur_el == 0 || cur_el == 1) {
-            /* Trap to PL1, which might be EL1 or EL3 */
-            if (arm_is_secure(env) && !arm_el_is_aa64(env, 3)) {
+    if ((arm_hcr_el2_eff(env) & (HCR_E2H | HCR_TGE)) != (HCR_E2H | HCR_TGE)) {
+        int fpen = extract32(env->cp15.cpacr_el1, 20, 2);
+
+        switch (fpen) {
+        case 0:
+        case 2:
+            if (cur_el == 0 || cur_el == 1) {
+                /* Trap to PL1, which might be EL1 or EL3 */
+                if (arm_is_secure(env) && !arm_el_is_aa64(env, 3)) {
+                    return 3;
+                }
+                return 1;
+            }
+            if (cur_el == 3 && !is_a64(env)) {
+                /* Secure PL1 running at EL3 */
                 return 3;
             }
-            return 1;
+            break;
+        case 1:
+            if (cur_el == 0) {
+                return 1;
+            }
+            break;
+        case 3:
+            break;
         }
-        if (cur_el == 3 && !is_a64(env)) {
-            /* Secure PL1 running at EL3 */
-            return 3;
-        }
-        break;
-    case 1:
-        if (cur_el == 0) {
-            return 1;
-        }
-        break;
-    case 3:
-        break;
     }
 
     /*
-- 
2.17.1