PV related validities are in the 0x20** range but the last byte might
be implementation specific, so everytime we check for a UV validity we
need to mask the last byte.
Let's add a function that checks for a UV validity and returns a
boolean.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
lib/s390x/uv.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib/s390x/uv.h b/lib/s390x/uv.h
index 5fe29bda..78b979b7 100644
--- a/lib/s390x/uv.h
+++ b/lib/s390x/uv.h
@@ -35,4 +35,11 @@ static inline void uv_setup_asces(void)
lctlg(13, asce);
}
+static inline bool uv_validity_check(struct vm *vm)
+{
+ uint16_t vir = sie_get_validity(vm);
+
+ return vm->sblk->icptcode == ICPT_VALIDITY && (vir & 0xff00) == 0x2000;
+}
+
#endif /* UV_H */
--
2.34.1
