diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 3719c0f190..7dc0994c89 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -2810,9 +2810,15 @@ static uint64_t xhci_port_read(void *ptr, hwaddr reg, unsigned size)
     case 0x08: /* PORTLI */
         ret = 0;
         break;
-    case 0x0c: /* reserved */
+    case 0x0c: /* PORTHLPMC */
+        ret = 0;
+        qemu_log_mask(LOG_UNIMP, "%s: read from port register PORTHLPMC",
+                      __func__);
+        break;
     default:
-        trace_usb_xhci_unimplemented("port read", reg);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: read from port offset 0x%" HWADDR_PRIx,
+                      __func__, reg);
         ret = 0;
     }
 
@@ -2881,9 +2887,22 @@ static void xhci_port_write(void *ptr, hwaddr reg,
         }
         break;
     case 0x04: /* PORTPMSC */
+    case 0x0c: /* PORTHLPMC */
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: write 0x%" PRIx64
+                      " (%u bytes) to port register at offset 0x%" HWADDR_PRIx,
+                      __func__, val, size, reg);
+        break;
     case 0x08: /* PORTLI */
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Write to read-only PORTLI register",
+                      __func__);
+        break;
     default:
-        trace_usb_xhci_unimplemented("port write", reg);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: write 0x%" PRIx64 " (%u bytes) to unknown port "
+                      "register at offset 0x%" HWADDR_PRIx,
+                      __func__, val, size, reg);
+        break;
     }
 }