[PATCH 4/4] [BROKEN] PPC: Activate UBSAN in testing

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>

This compiles, but something is up with the console and nothing useful comes
out.

Sample:
  https://gitlab.com/xen-project/people/andyhhp/xen/-/jobs/9079440897
---
 automation/gitlab-ci/build.yaml | 3 +++
 xen/arch/ppc/Kconfig            | 1 +
 xen/arch/ppc/stubs.c            | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index 35e224366f62..6a2e491534d3 100644
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -352,6 +352,9 @@ debian-12-ppc64le-gcc-debug:
     CONTAINER: debian:12-ppc64le
     KBUILD_DEFCONFIG: ppc64_defconfig
     HYPERVISOR_ONLY: y
+    EXTRA_XEN_CONFIG: |
+      CONFIG_UBSAN=y
+      CONFIG_UBSAN_FATAL=y
 
 debian-12-riscv64-gcc-debug:
   extends: .gcc-riscv64-cross-build-debug
diff --git a/xen/arch/ppc/Kconfig b/xen/arch/ppc/Kconfig
index 6db575a48d34..917f5d53a6c3 100644
--- a/xen/arch/ppc/Kconfig
+++ b/xen/arch/ppc/Kconfig
@@ -2,6 +2,7 @@ config PPC
        def_bool y
        select FUNCTION_ALIGNMENT_4B
        select HAS_DEVICE_TREE
+       select HAS_UBSAN
        select HAS_VMAP
 
 config PPC64
diff --git a/xen/arch/ppc/stubs.c b/xen/arch/ppc/stubs.c
index fff82f5cf3cc..671e71aa0a60 100644
--- a/xen/arch/ppc/stubs.c
+++ b/xen/arch/ppc/stubs.c
@@ -47,7 +47,7 @@ void send_timer_event(struct vcpu *v)
 
 void show_execution_state(const struct cpu_user_regs *regs)
 {
-    BUG_ON("unimplemented");
+    printk("TODO: Implement show_execution_state(regs)\n");
 }
 
 void arch_hypercall_tasklet_result(struct vcpu *v, long res)
-- 
2.39.5