intel-iommu: don't warn guest errors when getting rid2pasid entry

We use to warn on wrong rid2pasid entry. But this error could be
triggered by the guest and could happens during initialization. So
let's don't warn in this case.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221028061436.30093-2-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>

hw/i386/intel_iommu.c

@@ -1554,8 +1554,10 @@ static bool vtd_dev_pt_enabled(IntelIOMMUState *s, VTDContextEntry *ce)
     if (s->root_scalable) {
         ret = vtd_ce_get_rid2pasid_entry(s, ce, &pe);
         if (ret) {
-            error_report_once("%s: vtd_ce_get_rid2pasid_entry error: %"PRId32,
-                              __func__, ret);
+            /*
+             * This error is guest triggerable. We should assumt PT
+             * not enabled for safety.
+             */
             return false;
         }
         return (VTD_PE_GET_TYPE(&pe) == VTD_SM_PASID_ENTRY_PT);
@@ -1569,14 +1571,12 @@ static bool vtd_as_pt_enabled(VTDAddressSpace *as)
 {
     IntelIOMMUState *s;
     VTDContextEntry ce;
-    int ret;
 
     assert(as);
 
     s = as->iommu_state;
-    ret = vtd_dev_to_context_entry(s, pci_bus_num(as->bus),
-                                   as->devfn, &ce);
-    if (ret) {
+    if (vtd_dev_to_context_entry(s, pci_bus_num(as->bus), as->devfn,
+                                 &ce)) {
         /*
          * Possibly failed to parse the context entry for some reason
          * (e.g., during init, or any guest configuration errors on