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