[Buildroot] [PATCH v4 3/4] package/xen: add custom tarball support

Add support for custom tarballs such as tarballs from vendor Xen trees.

To test this feature, use the following configs to test latest release of the
Xilinx Xen vendor tree.

To test:
BR2_aarch64=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_AARCH64_GLIBC_STABLE=y
BR2_PACKAGE_XEN=y
BR2_PACKAGE_XEN_CUSTOM_TARBALL=y
BR2_PACKAGE_XEN_CUSTOM_TARBALL_LOCATION="$(call github,Xilinx,xen,xlnx-rebase-v4.21_2026.1)/xlnx-rebase-v4.21_2026.1.tar.gz"

Add to package/xen/xen.hash:
sha256  03498f51b8daae70c429ace4bde6e2be679b3a0ac28b886c7335c022feef6100  xlnx-rebase-v4.21_2026.1.tar.gz

Signed-off-by: Neal Frager <[email protected]>
Tested-by: Matthew Weber <[email protected]>
Prior test details: https://gist.github.com/matthew-l-weber/c17f14a3793ccee440a383e4177ff3db
Reviewed-by: John Ernberg <[email protected]>

---
V1->V2:
- rebased to updated master branch
- added the line move of the XEN_SITE definition
V2->V4:
- merged into new patch series as the second patch
---
 package/xen/Config.in | 11 +++++++++++
 package/xen/xen.mk    | 19 ++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/package/xen/Config.in b/package/xen/Config.in
index e50b232f0a..3726504334 100644
--- a/package/xen/Config.in
+++ b/package/xen/Config.in
@@ -23,8 +23,18 @@ config BR2_PACKAGE_XEN_CUSTOM_VERSION
 	help
 	  This option allows to use a specific official version
 
+config BR2_PACKAGE_XEN_CUSTOM_TARBALL
+	bool "Custom tarball"
+
 endchoice
 
+if BR2_PACKAGE_XEN_CUSTOM_TARBALL
+
+config BR2_PACKAGE_XEN_CUSTOM_TARBALL_LOCATION
+	string "URL of custom Xen tarball"
+
+endif
+
 config BR2_PACKAGE_XEN_CUSTOM_VERSION_VALUE
 	string "Xen version"
 	depends on BR2_PACKAGE_XEN_CUSTOM_VERSION
@@ -34,6 +44,7 @@ config BR2_PACKAGE_XEN_VERSION
 	default "4.21.1"	if BR2_PACKAGE_XEN_LATEST_VERSION
 	default BR2_PACKAGE_XEN_CUSTOM_VERSION_VALUE \
 				if BR2_PACKAGE_XEN_CUSTOM_VERSION
+	default "custom"	if BR2_PACKAGE_XEN_CUSTOM_TARBALL
 
 config BR2_PACKAGE_XEN_HYPERVISOR
 	bool "Xen hypervisor"
diff --git a/package/xen/xen.mk b/package/xen/xen.mk
index 51d51333ac..81568020d5 100644
--- a/package/xen/xen.mk
+++ b/package/xen/xen.mk
@@ -5,7 +5,6 @@
 ################################################################################
 
 XEN_VERSION = $(call qstrip,$(BR2_PACKAGE_XEN_VERSION))
-XEN_SITE = https://downloads.xenproject.org/release/xen/$(XEN_VERSION)
 XEN_SELINUX_MODULES = systemd udev xen
 XEN_LICENSE = GPL-2.0
 XEN_LICENSE_FILES = COPYING LICENSES/GPL-2.0
@@ -19,6 +18,18 @@ XEN_DEPENDENCIES = \
 	host-python3 \
 	host-python-distlib
 
+ifeq ($(BR2_PACKAGE_XEN_CUSTOM_TARBALL),y)
+# Handle custom Xen tarballs as specified by the configuration
+XEN_TARBALL = $(call qstrip,$(BR2_PACKAGE_XEN_CUSTOM_TARBALL_LOCATION))
+XEN_SITE = $(patsubst %/,%,$(dir $(XEN_TARBALL)))
+XEN_SOURCE = $(notdir $(XEN_TARBALL))
+else
+# Handle stable official Xen versions
+XEN_SITE = https://downloads.xenproject.org/release/xen/$(XEN_VERSION)
+endif
+
+BR_NO_CHECK_HASH_FOR += $(XEN_SOURCE)
+
 # Calculate XEN_ARCH
 ifeq ($(ARCH),aarch64)
 XEN_ARCH = arm64
@@ -90,4 +101,10 @@ XEN_INSTALL_TARGET = NO
 XEN_CONF_OPTS += --disable-tools
 endif
 
+ifeq ($(BR2_PACKAGE_XEN_CUSTOM_TARBALL),y)
+ifeq ($(call qstrip,$(BR2_PACKAGE_XEN_CUSTOM_TARBALL_LOCATION)),)
+$(error No tarball location specified. Please check BR2_PACKAGE_XEN_CUSTOM_TARBALL_LOCATION)
+endif
+endif
+
 $(eval $(autotools-package))
-- 
2.43.0

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