xen: introduce 4.21 recipes

This introduces the 4.21 recipes. Along with the main Xen and Xen-tools
updates, we also have the following:

 - two compile patches for xen and xen-tools that fix issues with the
   way yajl is pickup in the yocto environment
 - packaging of the new libxenmanage libraries
 - fixup of the watchdog system units
 - updates to the test packaging (new directories)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-extended/xen/files/0001-libxl_nocpuid-fix-build-error.patch

@@ -0,0 +1,41 @@
+From 61a061e43c86a78aaddb2efdcefeff29d13812c2 Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@gmail.com>
+Date: Thu, 20 Nov 2025 20:57:46 -0500
+Subject: [PATCH] libxl_nocpuid: fix build error
+
+The Yocto build requires an explict include of tye yajl headers to avoid
+this compile error:
+
+e/libnl3 -Wshadow -include poky/build/tmp/work/armv8a-poky-linux/xen-tools/4.21+stable/sources/xen-tools-4.21+stable/tools/libs/light/../../../tools/config.h  -c -o libxl_aoutils.o libxl_aoutils.c
+| libxl_nocpuid.c:43:1: error: unknown type name 'yajl_gen_status'
+|    43 | yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen hand,
+|       | ^~~~~~~~~~~~~~~
+| libxl_nocpuid.c:43:50: error: unknown type name 'yajl_gen'
+|    43 | yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen hand,
+|       |                                                  ^~~~~~~~
+| make[6]: *** [poky/build/tmp/work/armv8a-poky-linux/xen-tools/4.21+stable/sources/xen-tools-4.21+stable/tools/libs/light/../../../tools/Rules.mk:178: libxl_nocpuid.o] Error 1
+| make[6]: *** Waiting for unfinished jobs....
+
+Upstream-Status: Inappropriate [oe specific]
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
+---
+ tools/libs/light/libxl_nocpuid.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/tools/libs/light/libxl_nocpuid.c b/tools/libs/light/libxl_nocpuid.c
+index 0630959e76..00f6ac3233 100644
+--- a/tools/libs/light/libxl_nocpuid.c
++++ b/tools/libs/light/libxl_nocpuid.c
+@@ -14,6 +14,8 @@
+ 
+ #include "libxl_internal.h"
+ 
++#include <yajl/yajl_gen.h>
++
+ int libxl__cpuid_policy_is_empty(libxl_cpuid_policy_list *pl)
+ {
+     return 1;
+-- 
+2.39.2
+

recipes-extended/xen/files/0001-tools-libxl-Fix-build-with-NOCPUID-and-json-c.patch

@@ -0,0 +1,61 @@
+From 9b7072697616ffd19fcefcd3ec48eec481faf4e6 Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@gmail.com>
+Date: Thu, 20 Nov 2025 23:22:59 -0500
+Subject: [PATCH] tools/libxl: Fix build with NOCPUID and json-c
+
+The stub file `tools/libs/light/libxl_nocpuid.c`, used when CPUID
+support is disabled via `CONFIG_NOCPUID`, was incomplete. It was
+missing a stub implementation for the `json-c` function
+`libxl_cpuid_policy_list_gen_jso`.
+
+When building with both `CONFIG_NOCPUID` and `HAVE_LIBJSONC` (which
+is preferred by configure over yajl), auto-generated code in
+`_libxl_types.c` would reference `libxl_cpuid_policy_list_gen_jso`,
+leading to a linker error due to the undefined reference.
+
+Additionally, the file was missing a prototype for the `yajl` function
+`libxl_cpuid_policy_list_gen_json`, causing a compiler error
+(`-Werror=missing-prototypes`) in builds that did manage to select
+`yajl`.
+
+This commit fixes both issues by:
+1. Adding the missing function prototype for the `yajl` function.
+2. Adding the missing stub implementation for the `json-c` function,
+   guarded by `HAVE_LIBJSONC`.
+
+This ensures that xen-tools can be built successfully in all
+configurations related to CPUID and JSON library selection.
+
+Upstream-Status: Inappropriate [oe specific]
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
+---
+ tools/libs/light/libxl_nocpuid.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+Index: xen-tools-4.21+stable/tools/libs/light/libxl_nocpuid.c
+===================================================================
+--- xen-tools-4.21+stable.orig/tools/libs/light/libxl_nocpuid.c
++++ xen-tools-4.21+stable/tools/libs/light/libxl_nocpuid.c
+@@ -16,6 +16,21 @@
+ 
+ #include <yajl/yajl_gen.h>
+ 
++#include "libxl_json.h"
++
++#include <yajl/yajl_gen.h>
++
++yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen hand,
++                                                 libxl_cpuid_policy_list *pcpuid);
++
++#ifdef HAVE_LIBJSONC
++int libxl_cpuid_policy_list_gen_jso(json_object **jso_r,
++                                    libxl_cpuid_policy_list *pcpuid)
++{
++    return 0;
++}
++#endif
++
+ int libxl__cpuid_policy_is_empty(libxl_cpuid_policy_list *pl)
+ {
+     return 1;

recipes-extended/xen/xen-tools.inc

@@ -24,6 +24,7 @@ RDEPENDS:${PN} = "\
     bash perl xz \
     ${PN}-console \
     ${PN}-libxenguest \
+    ${PN}-libxenmanage \
     ${PN}-libxenlight \
     ${PN}-libxenvchan \
     ${PN}-libxenctrl \
@@ -176,6 +177,8 @@ PACKAGES = " \
     ${PN}-libxengnttab-dev \
     ${PN}-libxenguest \
     ${PN}-libxenguest-dev \
+    ${PN}-libxenmanage \
+    ${PN}-libxenmanage-dev \
     ${PN}-libxenhypfs \
     ${PN}-libxenhypfs-dev \
     ${PN}-libxenlight \
@@ -274,6 +277,7 @@ FILES:${PN}-doc = "\
 
 FILES:${PN}-staticdev += "\
     ${libdir}/libxenguest.a \
+    ${libdir}/libxenmanage.a \
     ${libdir}/libxenlight.a \
     ${libdir}/libxenvchan.a \
     ${libdir}/libxenctrl.a \
@@ -324,6 +328,13 @@ FILES:${PN}-libxengnttab-dev = " \
     ${datadir}/pkgconfig/xengnttab.pc \
     "
 
+FILES:${PN}-libxenmanage = "${libdir}/libxenmanage.so.*"
+FILES:${PN}-libxenmanage-dev = " \
+    ${libdir}/libxenmanage.so \
+    ${libdir}/pkgconfig/xenmanage.pc \
+    ${datadir}/pkgconfig/xenmanage.pc \
+    "
+
 FILES:${PN}-libxenguest = "${libdir}/libxenguest.so.*"
 FILES:${PN}-libxenguest-dev = " \
     ${libdir}/libxenguest.so \
@@ -631,6 +642,7 @@ FILES:${PN}-xen-watchdog = "\
     ${sbindir}/xenwatchdogd \
     ${sysconfdir}/init.d/xen-watchdog \
     ${systemd_unitdir}/system/xen-watchdog.service \
+    ${systemd_unitdir}/system-sleep/xen-watchdog-sleep.sh \
     "
 
 FILES:${PN}-xl = "\
@@ -715,6 +727,14 @@ FILES:${PN}-test += "\
     ${libdir}/xen/bin/test-cpu-policy \
     ${libdir}/xen/bin/test-tsx \
     ${libdir}/xen/bin/test-paging-mempool \
+    ${libdir}/xen/tests/test-xenstore \
+    ${libdir}/xen/tests/test-rangeset \
+    ${libdir}/xen/tests/test-resource \
+    ${libdir}/xen/tests/test-domid \
+    ${libdir}/xen/tests/test-paging-mempool \
+    ${libdir}/xen/tests/test_vpci \
+    ${libdir}/xen/tests/test-pdx-offset \
+    ${libdir}/xen/tests/test-pdx-mask \
     "
 
 # test-xenstore and test-resource currently only exist in 4.16

recipes-extended/xen/xen-tools_4.21.bb

@@ -0,0 +1,20 @@
+SRCREV ?= "06af9ef22996cecc2024a2e6523cec77a655581e"
+
+XEN_REL ?= "4.21"
+XEN_BRANCH ?= "stable-4.21"
+
+SRC_URI = " \
+    git://xenbits.xen.org/xen.git;branch=${XEN_BRANCH} \
+    file://0001-python-pygrub-pass-DISTUTILS-xen-4.19.patch \
+    file://0001-libxl_nocpuid-fix-build-error.patch \
+    file://0001-tools-libxl-Fix-build-with-NOCPUID-and-json-c.patch \
+    "
+
+LIC_FILES_CHKSUM ?= "file://COPYING;md5=d1a1e216f80b6d8da95fec897d0dbec9"
+
+PV = "${XEN_REL}+stable"
+
+DEFAULT_PREFERENCE ??= "-1"
+
+require xen.inc
+require xen-tools.inc

recipes-extended/xen/xen_4.21.bb

@@ -0,0 +1,19 @@
+SRCREV ?= "06af9ef22996cecc2024a2e6523cec77a655581e"
+
+XEN_REL ?= "4.21.0"
+XEN_BRANCH ?= "stable-4.21"
+
+SRC_URI = " \
+    git://xenbits.xen.org/xen.git;branch=${XEN_BRANCH} \
+    file://0001-menuconfig-mconf-cfg-Allow-specification-of-ncurses-location.patch \
+    file://0001-libxl_nocpuid-fix-build-error.patch \
+    "
+
+LIC_FILES_CHKSUM ?= "file://COPYING;md5=d1a1e216f80b6d8da95fec897d0dbec9"
+
+PV = "${XEN_REL}+stable"
+
+DEFAULT_PREFERENCE ??= "-1"
+
+require xen.inc
+require xen-hypervisor.inc