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docs: formatdomain: document intel-only IOMMU attributes

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Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
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Ján Tomko
2025-06-24 12:14:04 +02:00
parent 33a5d9dcea
commit 6291b0af3d
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@@ -9076,14 +9076,15 @@ Example:
``caching_mode``
The ``caching_mode`` attribute with possible values ``on`` and ``off`` can
be used to turn on the VT-d caching mode (useful for assigned devices).
:since:`Since 3.4.0` (QEMU/KVM only)
:since:`Since 3.4.0` (QEMU/KVM and ``intel`` model only)
``eim``
The ``eim`` attribute (with possible values ``on`` and ``off``) can be
used to configure Extended Interrupt Mode. A q35 domain with split I/O
APIC (as described in `Hypervisor features`_), and
both interrupt remapping and EIM turned on for the IOMMU, will be able to
use more than 255 vCPUs. :since:`Since 3.4.0` (QEMU/KVM only)
use more than 255 vCPUs. :since:`Since 3.4.0` (QEMU/KVM and ``intel`` model
only)
``iotlb``
The ``iotlb`` attribute with possible values ``on`` and ``off`` can be
@@ -9093,14 +9094,14 @@ Example:
``aw_bits``
The ``aw_bits`` attribute can be used to set the address width to allow
mapping larger iova addresses in the guest. :since:`Since 6.5.0` (QEMU/KVM
only)
and ``intel`` model only)
``dma_translation``
The ``dma_translation`` attribute with possible values ``on`` and ``off`` can
be used to turn off the dma translation for IOMMU. It is useful when only
interrupt remapping is required but dma translation overhead is unwanted, for
example to efficiently enable more than 255 vCPUs.
:since:`Since 10.7.0` (QEMU/KVM only)
:since:`Since 10.7.0` (QEMU/KVM and ``intel`` model only)
The ``virtio`` IOMMU devices can further have ``address`` element as described
in `Device addresses`_ (address has to by type of ``pci``).