Hi Vikram,
On 19/08/2023 01:28, Vikram Garhwal wrote:
Introduce a config option where the user can enable support for adding/removing
device tree nodes using a device tree binary overlay.
Update SUPPORT.md and CHANGELOG.md to state the Device Tree Overlays support for
Arm.
Signed-off-by: Vikram Garhwal <vikram.garh...@amd.com>
Acked-by: Henry Wang <henry.w...@arm.com>
Reviewed-by: Michal Orzel <michal.or...@amd.com>
---
Changes from v7:
Add this feature as "experimental support" in CHANGELOG.md
---
---
CHANGELOG.md | 3 ++-
SUPPORT.md | 6 ++++++
xen/arch/arm/Kconfig | 5 +++++
3 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d7e0590f8..47098dbfca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,7 +24,8 @@ The format is based on [Keep a
Changelog](https://keepachangelog.com/en/1.0.0/)
- xl/libxl can customize SMBIOS strings for HVM guests.
- Add support for AVX512-FP16 on x86.
- On Arm, Xen supports guests running SVE/SVE2 instructions. (Tech Preview)
-
+ - On Arm, experimental support for dynamic addition/removal of Xen device tree
+ nodes using a device tree overlay binary(.dtbo).
Typo: missing space before (.
## [4.17.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.17.0) - 2022-12-12
diff --git a/SUPPORT.md b/SUPPORT.md
index 35a6249e03..8eb006565c 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -844,6 +844,12 @@ No support for QEMU backends in a 16K or 64K domain.
Status: Supported
+### Device Tree Overlays
+
+Add/Remove device tree nodes using a device tree overlay binary(.dtbo).
Same here. I don't suggest to handle it on commit because this is not
something I want to merge without the rest of the series.
+
+ Status, ARM: Experimental
+
### ARM: Guest ACPI support
Status: Supported
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index fd57a82dd2..02c4796438 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -92,6 +92,11 @@ config HAS_ITS
bool "GICv3 ITS MSI controller support (UNSUPPORTED)" if UNSUPPORTED
depends on GICV3 && !NEW_VGIC && !ARM_32
+config OVERLAY_DTB
+ bool "DTB overlay support (UNSUPPORTED)" if UNSUPPORTED
+ help
+ Dynamic addition/removal of Xen device tree nodes using a dtbo.
Do we have any documentation in the tree of the limitations and how this
works?
The reason I am asking is the wording here suggests that it would be
possible to remove nodes from the original Device-Tree. AFAIU this is
not possible with the implementation and you are not planning to handle
it. Correct?
Cheers,
--
Julien Grall
