target/ppc: Properly sync cpu state with new msr in cpu_load_old

Match cpu_post_load in using ppc_store_msr to set all of
the cpu state implied by the value of msr.  Do not restore
hflags or hflags_nmsr, as we recompute them in ppc_store_msr.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210315184615.1985590-4-richard.henderson@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

target/ppc/machine.c

@@ -21,6 +21,7 @@ static int cpu_load_old(QEMUFile *f, void *opaque, int version_id)
     int32_t slb_nr;
 #endif
     target_ulong xer;
+    target_ulong msr;
 
     for (i = 0; i < 32; i++) {
         qemu_get_betls(f, &env->gpr[i]);
@@ -111,11 +112,19 @@ static int cpu_load_old(QEMUFile *f, void *opaque, int version_id)
     qemu_get_betls(f, &env->ivpr_mask);
     qemu_get_betls(f, &env->hreset_vector);
     qemu_get_betls(f, &env->nip);
-    qemu_get_betls(f, &env->hflags);
-    qemu_get_betls(f, &env->hflags_nmsr);
+    qemu_get_sbetl(f); /* Discard unused hflags */
+    qemu_get_sbetl(f); /* Discard unused hflags_nmsr */
     qemu_get_sbe32(f); /* Discard unused mmu_idx */
     qemu_get_sbe32(f); /* Discard unused power_mode */
 
+    /*
+     * Invalidate all supported msr bits except MSR_TGPR/MSR_HVB
+     * before restoring.  Note that this recomputes hflags and mem_idx.
+     */
+    msr = env->msr;
+    env->msr ^= env->msr_mask & ~((1ULL << MSR_TGPR) | MSR_HVB);
+    ppc_store_msr(env, msr);
+
     /* Recompute mmu indices */
     hreg_compute_mem_idx(env);