diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 0fb4350d48..71497f1936 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4590,7 +4590,7 @@ static void vtd_cap_init(IntelIOMMUState *s)
     }
 
     if (s->pasid) {
-        s->ecap |= VTD_ECAP_PASID;
+        s->ecap |= VTD_ECAP_PASID | VTD_ECAP_PSS;
     }
 }
 
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index e8b211e8b0..360e937989 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -192,6 +192,7 @@
 #define VTD_ECAP_SC                 (1ULL << 7)
 #define VTD_ECAP_MHMV               (15ULL << 20)
 #define VTD_ECAP_SRS                (1ULL << 31)
+#define VTD_ECAP_PSS                (7ULL << 35) /* limit: MemTxAttrs::pid */
 #define VTD_ECAP_PASID              (1ULL << 40)
 #define VTD_ECAP_SMTS               (1ULL << 43)
 #define VTD_ECAP_SLTS               (1ULL << 46)