Introduce a new Arm-specific DOMU_TRAP_UNMAP parameter that allows
configuring how Xen handles domain accesses to unmapped address ranges.
This parameter corresponds to the "trap-unmapped-accesses" device tree
property.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
---
README.md | 6 ++++++
scripts/uboot-script-gen | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/README.md b/README.md
index 2efac97..7ec7e7c 100644
--- a/README.md
+++ b/README.md
@@ -319,6 +319,12 @@ Where:
2: Hardware
4: Xenstore
+- DOMU_TRAP_UNMAP[number] is an Arm-only option that configures handling of
+ domain accesses to unmapped address ranges. It is optional and has no effect
+ on x86. If set to 0, domain reads will return all bits as ones corresponding
+ to the access size and writes will be ignored. If set to 1, such accesses will
+ trap. The default is 1 when not specified.
+
- 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 e319de8..7912cc7 100755
--- a/scripts/uboot-script-gen
+++ b/scripts/uboot-script-gen
@@ -493,6 +493,11 @@ function xen_device_tree_editing()
dt_set "/chosen/domU$i" "capabilities" "int" "$caps"
fi
+ if test -n "${DOMU_TRAP_UNMAP[$i]}" && (test "${DOMU_TRAP_UNMAP[$i]}" -eq "0" || test "${DOMU_TRAP_UNMAP[$i]}" -eq "1")
+ then
+ dt_set "/chosen/domU$i" "trap-unmapped-accesses" "int" "${DOMU_TRAP_UNMAP[$i]}"
+ fi
+
if test -n "${DOMU_SHARED_MEM[i]}"
then
add_device_tree_static_shared_mem "/chosen/domU${i}" "${DOMU_SHARED_MEM[i]}"
--
2.34.1