[kvm-unit-tests PATCH v4 5/7] s390x: lib: add teid union and clear teid from lowcore

[Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>]

Add a union to represent Translation-Exception Identification (TEID).

Clear the TEID in expect_pgm_int clear_pgm_int.

Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
 lib/s390x/asm/interrupt.h | 22 ++++++++++++++++++++++
 lib/s390x/interrupt.c     |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/lib/s390x/asm/interrupt.h b/lib/s390x/asm/interrupt.h
index bf0eb40d..b40def65 100644
--- a/lib/s390x/asm/interrupt.h
+++ b/lib/s390x/asm/interrupt.h
@@ -13,6 +13,28 @@
 #define EXT_IRQ_EXTERNAL_CALL	0x1202
 #define EXT_IRQ_SERVICE_SIG	0x2401
 
+#define TEID_ASCE_PRIMARY	0
+#define TEID_ASCE_AR		1
+#define TEID_ASCE_SECONDARY	2
+#define TEID_ASCE_HOME		3
+
+union teid {
+	unsigned long val;
+	struct {
+		unsigned long addr:52;
+		unsigned long fetch:1;
+		unsigned long store:1;
+		unsigned long reserved:6;
+		unsigned long acc_list_prot:1;
+		/* depending on the exception and the installed facilities,
+		 * the m field can indicate severel different things,
+		 * including whether the exception was triggered by a MVPG
+		 * instruction, or whether the addr field is meaningful */
+		unsigned long m:1;
+		unsigned long asce_id:2;
+	};
+};
+
 void register_pgm_cleanup_func(void (*f)(void));
 void handle_pgm_int(struct stack_frame_int *stack);
 void handle_ext_int(struct stack_frame_int *stack);
diff --git a/lib/s390x/interrupt.c b/lib/s390x/interrupt.c
index ce0003de..b627942f 100644
--- a/lib/s390x/interrupt.c
+++ b/lib/s390x/interrupt.c
@@ -22,6 +22,7 @@ void expect_pgm_int(void)
 {
 	pgm_int_expected = true;
 	lc->pgm_int_code = 0;
+	lc->trans_exc_id = 0;
 	mb();
 }
 
@@ -39,6 +40,7 @@ uint16_t clear_pgm_int(void)
 	mb();
 	code = lc->pgm_int_code;
 	lc->pgm_int_code = 0;
+	lc->trans_exc_id = 0;
 	pgm_int_expected = false;
 	return code;
 }
-- 
2.31.1