An invalid PSW causes a program interrupt. When an invalid PSW is
introduced in the pgm_new_psw, an interrupt loop occurs as soon as a
program interrupt is caused.
QEMU should detect that and panick the guest, hence add a test for it.
Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
s390x/Makefile | 1 +
s390x/pgmint-loop.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
s390x/unittests.cfg | 4 ++++
3 files changed, 51 insertions(+)
create mode 100644 s390x/pgmint-loop.c
diff --git a/s390x/Makefile b/s390x/Makefile
index 92a020234c9f..a600dbfb3f4c 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -35,6 +35,7 @@ tests += $(TEST_DIR)/pv-attest.elf
tests += $(TEST_DIR)/migration-cmm.elf
tests += $(TEST_DIR)/migration-skey.elf
tests += $(TEST_DIR)/extint-loop.elf
+tests += $(TEST_DIR)/pgmint-loop.elf
pv-tests += $(TEST_DIR)/pv-diags.elf
diff --git a/s390x/pgmint-loop.c b/s390x/pgmint-loop.c
new file mode 100644
index 000000000000..5b74f26dbc3d
--- /dev/null
+++ b/s390x/pgmint-loop.c
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Program interrupt loop test
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Authors:
+ * Nico Boehr <nrb@xxxxxxxxxxxxx>
+ */
+#include <libcflat.h>
+#include <bitops.h>
+#include <asm/interrupt.h>
+#include <asm/barrier.h>
+
+static void pgm_int_handler(void)
+{
+ /*
+ * return to pgm_old_psw. This gives us the chance to print the return_fail
+ * in case something goes wrong.
+ */
+ asm volatile (
+ "lpswe %[pgm_old_psw]\n"
+ :
+ : [pgm_old_psw] "Q"(lowcore.pgm_old_psw)
+ : "memory"
+ );
+}
+
+int main(void)
+{
+ report_prefix_push("pgmint-loop");
+
+ lowcore.pgm_new_psw.addr = (uint64_t) pgm_int_handler;
+ /* bit 12 set is invalid */
+ lowcore.pgm_new_psw.mask = extract_psw_mask() | BIT(63 - 12);
+ mb();
+
+ /* cause a pgm int */
+ *((int *)-4) = 0x42;
+ mb();
+
+ report_fail("survived pgmint loop");
+
+ report_prefix_pop();
+ return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 7d408f2d5310..c3073bfc4363 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -188,3 +188,7 @@ groups = migration
[extint-loop]
file = extint-loop.elf
groups = panic
+
+[pgmint-loop]
+file = pgmint-loop.elf
+groups = panic
--
2.36.1
