This property is used to grant a non-hardware domain permission to use the IOMMU, which is a prerequisite for device passthrough.
Signed-off-by: Oleksandr Tyshchenko <[email protected]> --- README.md | 6 ++++++ scripts/uboot-script-gen | 5 +++++ 2 files changed, 11 insertions(+) diff --git a/README.md b/README.md index 0063747..983cbbc 100644 --- a/README.md +++ b/README.md @@ -338,6 +338,12 @@ Where: assigned to a regular DomU. - An explicit non-zero ID cannot be assigned to the hardware domain itself. +- DOMU_PASSTHROUGH_PROP[number] is optional string used to permit a non-hardware + domain to use the IOMMU, which is a prerequisite for device passthrough. + If set to "enabled", the passthrough = "enabled"; property is added to + the domain's device tree node. This option has no effect if the IOMMU is not + active. + - LINUX is optional but specifies the Linux kernel for when Xen is NOT used. To enable this set any LINUX\_\* variables and do NOT set the XEN variable. diff --git a/scripts/uboot-script-gen b/scripts/uboot-script-gen index 78a731d..d18ac55 100755 --- a/scripts/uboot-script-gen +++ b/scripts/uboot-script-gen @@ -509,6 +509,11 @@ function xen_device_tree_editing() dt_set "/chosen/domU$i" "domid" "int" "${DOMU_DOMID[$i]}" fi + if test "${DOMU_PASSTHROUGH_PROP[$i]}" = "enabled" + then + dt_set "/chosen/domU$i" "passthrough" "str" "enabled" + fi + if test -n "${DOMU_SHARED_MEM[i]}" then add_device_tree_static_shared_mem "/chosen/domU${i}" "${DOMU_SHARED_MEM[i]}" -- 2.34.1
