target-ppc: move sdr1 value change detection logic to helper_store_sdr1()

Otherwise when cpu_post_load calls ppc_store_sdr1() when restoring a VM
snapshot the value is deemed unchanged and so the internal env->htab*
variables aren't set correctly.
Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-ppc/misc_helper.c

@@ -77,8 +77,13 @@ void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
 
 void helper_store_sdr1(CPUPPCState *env, target_ulong val)
 {
+    PowerPCCPU *cpu = ppc_env_get_cpu(env);
+
     if (!env->external_htab) {
-        ppc_store_sdr1(env, val);
+        if (env->spr[SPR_SDR1] != val) {
+            ppc_store_sdr1(env, val);
+            tlb_flush(CPU(cpu), 1);
+        }
     }
 }
 

target-ppc/mmu_helper.c

@@ -2036,31 +2036,26 @@ void ppc_tlb_invalidate_one(CPUPPCState *env, target_ulong addr)
 /* Special registers manipulation */
 void ppc_store_sdr1(CPUPPCState *env, target_ulong value)
 {
-    PowerPCCPU *cpu = ppc_env_get_cpu(env);
-
     qemu_log_mask(CPU_LOG_MMU, "%s: " TARGET_FMT_lx "\n", __func__, value);
     assert(!env->external_htab);
-    if (env->spr[SPR_SDR1] != value) {
-        env->spr[SPR_SDR1] = value;
+    env->spr[SPR_SDR1] = value;
 #if defined(TARGET_PPC64)
-        if (env->mmu_model & POWERPC_MMU_64) {
-            target_ulong htabsize = value & SDR_64_HTABSIZE;
+    if (env->mmu_model & POWERPC_MMU_64) {
+        target_ulong htabsize = value & SDR_64_HTABSIZE;
 
-            if (htabsize > 28) {
-                fprintf(stderr, "Invalid HTABSIZE 0x" TARGET_FMT_lx
-                        " stored in SDR1\n", htabsize);
-                htabsize = 28;
-            }
-            env->htab_mask = (1ULL << (htabsize + 18 - 7)) - 1;
-            env->htab_base = value & SDR_64_HTABORG;
-        } else
-#endif /* defined(TARGET_PPC64) */
-        {
-            /* FIXME: Should check for valid HTABMASK values */
-            env->htab_mask = ((value & SDR_32_HTABMASK) << 16) | 0xFFFF;
-            env->htab_base = value & SDR_32_HTABORG;
+        if (htabsize > 28) {
+            fprintf(stderr, "Invalid HTABSIZE 0x" TARGET_FMT_lx
+                    " stored in SDR1\n", htabsize);
+            htabsize = 28;
         }
-        tlb_flush(CPU(cpu), 1);
+        env->htab_mask = (1ULL << (htabsize + 18 - 7)) - 1;
+        env->htab_base = value & SDR_64_HTABORG;
+    } else
+#endif /* defined(TARGET_PPC64) */
+    {
+        /* FIXME: Should check for valid HTABMASK values */
+        env->htab_mask = ((value & SDR_32_HTABMASK) << 16) | 0xFFFF;
+        env->htab_base = value & SDR_32_HTABORG;
     }
 }