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css: SCHIB measurement block origin must be aligned

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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>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1613741973-3711-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Pierre Morel 2021-02-19 14:39:33 +01:00 committed by Cornelia Huck
parent 151fcdfd62
commit a54b8ac340
1 changed files with 6 additions and 0 deletions
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6
target/s390x/ioinst.c
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@ -121,6 +121,12 @@ static int ioinst_schib_valid(SCHIB *schib)
if (be32_to_cpu(schib->pmcw.chars) & PMCW_CHARS_MASK_XMWME) { if (be32_to_cpu(schib->pmcw.chars) & PMCW_CHARS_MASK_XMWME) {
return 0; 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; return 1;
} }