The Measurement Block Origin inside the SCHIB is used when
Measurement Block format 1 is in used and must be aligned
on 64 bytes otherwise an operand exception is recognized
when issuing the Modify Sub CHannel (MSCH) instruction.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
target/s390x/ioinst.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
index a412926d27..1ee11522e1 100644
--- a/target/s390x/ioinst.c
+++ b/target/s390x/ioinst.c
@@ -121,6 +121,12 @@ static int ioinst_schib_valid(SCHIB *schib)
if (be32_to_cpu(schib->pmcw.chars) & PMCW_CHARS_MASK_XMWME) {
return 0;
}
+ /* for MB format 1 bits 26-31 of word 11 must be 0 */
+ /* MBA uses words 10 and 11, it means align on 2**6 */
+ if ((be16_to_cpu(schib->pmcw.chars) & PMCW_CHARS_MASK_MBFC) &&
+ (be64_to_cpu(schib->mba) & 0x03fUL)) {
+ return 0;
+ }
return 1;
}