[kvm-unit-tests PATCH v5 1/8] lib: s390x: sie: Fix sie_get_validity() no validity handling

[Janosch Frank <frankja@linux.ibm.com>]

Rather than asserting, we can return a value that's designated as a
programming only value to indicate that there has been no validity.

The SIE instruction will never write 0xffff as a validity code so
let's just use that constant.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 lib/s390x/sie.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/s390x/sie.c b/lib/s390x/sie.c
index 9241b4b4..b44febde 100644
--- a/lib/s390x/sie.c
+++ b/lib/s390x/sie.c
@@ -23,7 +23,13 @@ void sie_expect_validity(struct vm *vm)
 
 uint16_t sie_get_validity(struct vm *vm)
 {
-	assert(vm->sblk->icptcode == ICPT_VALIDITY);
+	/*
+	 * 0xffff will never be returned by SIE, so we can indicate a
+	 * missing validity via this value.
+	 */
+	if (vm->sblk->icptcode != ICPT_VALIDITY)
+		return 0xffff;
+
 	return vm->sblk->ipb >> 16;
 }
 
-- 
2.34.1