Re: [PATCH 1/3] Conf: add dma_translation attribute to iommu

Add dma_translation attribute to iommu to enable/disable dma traslation for intel-iommu Signed-off-by: Sandesh Patel <sandesh.patel(a)nutanix.com&gt; --- docs/formatdomain.rst | 7 +++++++ src/conf/domain_conf.c | 15 +++++++++++++++ src/conf/domain_conf.h | 1 + src/conf/schemas/domaincommon.rng | 5 +++++ 4 files changed, 28 insertions(+) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index c56b739b23..a037ab65e4 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -8611,6 +8611,13 @@ Example: mapping larger iova addresses in the guest. :since:`Since 6.5.0` (QEMU/KVM 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 10.6.1` (QEMU/KVM only)