From 27c1b81d6195ca5f39d656c5cca497ed78943339 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Mon, 24 Oct 2022 15:18:45 +1000
Subject: [PATCH] target/arm: Fix fault reporting in get_phys_addr_lpae
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Always overriding fi->type was incorrect, as we would not properly
propagate the fault type from S1_ptw_translate, or arm_ldq_ptw.
Simplify things by providing a new label for a translation fault.
For other faults, store into fi directly.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20221024051851.3074715-9-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/ptw.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 2a5f018835..3302376e42 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -1044,8 +1044,6 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     ARMCPU *cpu = env_archcpu(env);
     ARMMMUIdx mmu_idx = ptw->in_mmu_idx;
     bool is_secure = ptw->in_secure;
-    /* Read an LPAE long-descriptor translation table. */
-    ARMFaultType fault_type = ARMFault_Translation;
     uint32_t level;
     ARMVAParameters param;
     uint64_t ttbr;
@@ -1082,8 +1080,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
          * so our choice is to always raise the fault.
          */
         if (param.tsz_oob) {
-            fault_type = ARMFault_Translation;
-            goto do_fault;
+            goto do_translation_fault;
         }
 
         addrsize = 64 - 8 * param.tbi;
@@ -1120,8 +1117,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
                                            addrsize - inputsize);
         if (-top_bits != param.select) {
             /* The gap between the two regions is a Translation fault */
-            fault_type = ARMFault_Translation;
-            goto do_fault;
+            goto do_translation_fault;
         }
     }
 
@@ -1147,7 +1143,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
          * Translation table walk disabled => Translation fault on TLB miss
          * Note: This is always 0 on 64-bit EL2 and EL3.
          */
-        goto do_fault;
+        goto do_translation_fault;
     }
 
     if (!regime_is_stage2(mmu_idx)) {
@@ -1178,8 +1174,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
         if (param.ds && stride == 9 && sl2) {
             if (sl0 != 0) {
                 level = 0;
-                fault_type = ARMFault_Translation;
-                goto do_fault;
+                goto do_translation_fault;
             }
             startlevel = -1;
         } else if (!aarch64 || stride == 9) {
@@ -1198,8 +1193,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
         ok = check_s2_mmu_setup(cpu, aarch64, startlevel,
                                 inputsize, stride, outputsize);
         if (!ok) {
-            fault_type = ARMFault_Translation;
-            goto do_fault;
+            goto do_translation_fault;
         }
         level = startlevel;
     }
@@ -1221,7 +1215,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
         descaddr |= extract64(ttbr, 2, 4) << 48;
     } else if (descaddr >> outputsize) {
         level = 0;
-        fault_type = ARMFault_AddressSize;
+        fi->type = ARMFault_AddressSize;
         goto do_fault;
     }
 
@@ -1282,7 +1276,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
 
     if (!(descriptor & 1) || (!(descriptor & 2) && (level == 3))) {
         /* Invalid, or the Reserved level 3 encoding */
-        goto do_fault;
+        goto do_translation_fault;
     }
 
     descaddr = descriptor & descaddrmask;
@@ -1300,7 +1294,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
             descaddr |= extract64(descriptor, 12, 4) << 48;
         }
     } else if (descaddr >> outputsize) {
-        fault_type = ARMFault_AddressSize;
+        fi->type = ARMFault_AddressSize;
         goto do_fault;
     }
 
@@ -1357,9 +1351,9 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
      * Here descaddr is the final physical address, and attributes
      * are all in attrs.
      */
-    fault_type = ARMFault_AccessFlag;
     if ((attrs & (1 << 8)) == 0) {
         /* Access flag */
+        fi->type = ARMFault_AccessFlag;
         goto do_fault;
     }
 
@@ -1376,8 +1370,8 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
         result->f.prot = get_S1prot(env, mmu_idx, aarch64, ap, ns, xn, pxn);
     }
 
-    fault_type = ARMFault_Permission;
     if (!(result->f.prot & (1 << access_type))) {
+        fi->type = ARMFault_Permission;
         goto do_fault;
     }
 
@@ -1422,8 +1416,9 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     result->f.lg_page_size = ctz64(page_size);
     return false;
 
-do_fault:
-    fi->type = fault_type;
+ do_translation_fault:
+    fi->type = ARMFault_Translation;
+ do_fault:
     fi->level = level;
     /* Tag the error as S2 for failed S1 PTW at S2 or ordinary S2.  */
     fi->stage2 = fi->s1ptw || regime_is_stage2(mmu_idx);