diff --git a/docs/formatdomaincaps.rst b/docs/formatdomaincaps.rst
index 8b4f0ecff3..6ba7f84f96 100644
--- a/docs/formatdomaincaps.rst
+++ b/docs/formatdomaincaps.rst
@@ -461,6 +461,10 @@ Well, only if the following is enabled:
            <value>vfio</value>
            <value>xen</value>
          </enum>
+         <enum name='iommufd'>
+           <value>yes</value>
+           <value>no</value>
+         </enum>
        </hostdev>
      </devices>
    </domainCapabilities>
@@ -477,6 +481,9 @@ Well, only if the following is enabled:
    ``mode="capabilities"``.
 ``pciBackend``
    Options for the ``name`` attribute of the <driver/> element.
+``iommufd``
+   Options for the ``iommufd`` attribute of the <driver/> element.
+   :since:`Since 12.1.0`
 
 RNG device
 ^^^^^^^^^^
diff --git a/src/conf/domain_capabilities.c b/src/conf/domain_capabilities.c
index f843124695..49179b97ab 100644
--- a/src/conf/domain_capabilities.c
+++ b/src/conf/domain_capabilities.c
@@ -620,6 +620,7 @@ virDomainCapsDeviceHostdevFormat(virBuffer *buf,
     ENUM_PROCESS(hostdev, subsysType, virDomainHostdevSubsysTypeToString);
     ENUM_PROCESS(hostdev, capsType, virDomainHostdevCapsTypeToString);
     ENUM_PROCESS(hostdev, pciBackend, virDeviceHostdevPCIDriverNameTypeToString);
+    ENUM_PROCESS(hostdev, iommufd, virTristateBoolTypeToString);
 
     FORMAT_EPILOGUE(hostdev);
 }
diff --git a/src/conf/domain_capabilities.h b/src/conf/domain_capabilities.h
index 437981c711..b10370db8f 100644
--- a/src/conf/domain_capabilities.h
+++ b/src/conf/domain_capabilities.h
@@ -108,6 +108,7 @@ struct _virDomainCapsDeviceHostdev {
     virDomainCapsEnum subsysType;       /* Info about virDomainHostdevSubsysType */
     virDomainCapsEnum capsType;         /* Info about virDomainHostdevCapsType */
     virDomainCapsEnum pciBackend;       /* Info about virDomainHostdevSubsysPCIBackendType */
+    virDomainCapsEnum iommufd;          /* Info about iommufd:virTristateBool */
     /* add new fields here */
 };