[PATCH-for-9.1,v3,2/2] target/mips: Use correct MMU index in get_pte()

Commit Message

Philippe Mathieu-Daudé Aug. 13, 2024, 1:53 p.m. UTC

When refactoring page_table_walk_refill() in commit 4e999bf419
we missed the indirect call to cpu_mmu_index() in get_pte():

  page_table_walk_refill()
  -> get_pte()
     -> cpu_ld[lq]_code()
        -> cpu_mmu_index()

Since we don't mask anymore the modes in hflags, cpu_mmu_index()
can return UM or SM, while we only expect KM or ERL.

Fix by propagating ptw_mmu_idx to get_pte(), and use the
cpu_ld/st_code_mmu() API with the correct MemOpIdx.

Reported-by: Thomas Petazzoni <[e-mail]>
Reported-by: Waldemar Brodkorb <[e-mail]>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2470
Fixes: 4e999bf419 ("target/mips: Pass ptw_mmu_idx down from mips_cpu_tlb_fill")
Signed-off-by: Philippe Mathieu-Daudé <[e-mail]>
Reviewed-by: Richard Henderson <[e-mail]>
---
 target/mips/tcg/sysemu/tlb_helper.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

Patch

diff --git a/target/mips/tcg/sysemu/tlb_helper.c b/target/mips/tcg/sysemu/tlb_helper.c
index 75a26131ca..5bff4cb72f 100644
--- a/target/mips/tcg/sysemu/tlb_helper.c
+++ b/target/mips/tcg/sysemu/tlb_helper.c
@@ -593,16 +593,21 @@  static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
  */
 
 static bool get_pte(CPUMIPSState *env, uint64_t vaddr, MemOp op,
-        uint64_t *pte)
+                    uint64_t *pte, unsigned ptw_mmu_idx)
 {
+    MemOpIdx oi;
+
     if ((vaddr & (memop_size(op) - 1)) != 0) {
         return false;
     }
+
+    oi = make_memop_idx(op | MO_TE, ptw_mmu_idx);
     if (op == MO_64) {
-        *pte = cpu_ldq_code(env, vaddr);
+        *pte = cpu_ldq_code_mmu(env, vaddr, oi, 0);
     } else {
-        *pte = cpu_ldl_code(env, vaddr);
+        *pte = cpu_ldl_code_mmu(env, vaddr, oi, 0);
     }
+
     return true;
 }
 
@@ -641,7 +646,7 @@  static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
         /* wrong base address */
         return 0;
     }
-    if (!get_pte(env, *vaddr, directory_mop, &entry)) {
+    if (!get_pte(env, *vaddr, directory_mop, &entry, ptw_mmu_idx)) {
         return 0;
     }
 
@@ -667,7 +672,7 @@  static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
                                      ptw_mmu_idx) != TLBRET_MATCH) {
                 return 0;
             }
-            if (!get_pte(env, vaddr2, leaf_mop, &entry)) {
+            if (!get_pte(env, vaddr2, leaf_mop, &entry, ptw_mmu_idx)) {
                 return 0;
             }
             entry = get_tlb_entry_layout(env, entry, leaf_mop, pf_ptew);
@@ -822,7 +827,7 @@  static bool page_table_walk_refill(CPUMIPSState *env, vaddr address,
                              ptw_mmu_idx) != TLBRET_MATCH) {
         return false;
     }
-    if (!get_pte(env, vaddr, leaf_mop, &dir_entry)) {
+    if (!get_pte(env, vaddr, leaf_mop, &dir_entry, ptw_mmu_idx)) {
         return false;
     }
     dir_entry = get_tlb_entry_layout(env, dir_entry, leaf_mop, pf_ptew);
@@ -834,7 +839,7 @@  static bool page_table_walk_refill(CPUMIPSState *env, vaddr address,
                              ptw_mmu_idx) != TLBRET_MATCH) {
         return false;
     }
-    if (!get_pte(env, vaddr, leaf_mop, &dir_entry)) {
+    if (!get_pte(env, vaddr, leaf_mop, &dir_entry, ptw_mmu_idx)) {
         return false;
     }
     dir_entry = get_tlb_entry_layout(env, dir_entry, leaf_mop, pf_ptew);