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s390x/css: handle ccw-0 TIC correctly 

In CCW-0 format TIC command 4 highest bits are ignored in the subchannel.
In CCW-1 format the TIC command 4 highest bits must be 0.
To convert TIC from CCW-0 to CCW-1 we clear the 4 highest bits
to guarantee compatibility.

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Pierre Morel 2015-07-15 16:16:20 +02:00 committed by Cornelia Huck
parent 4169198617
commit fde8206b80
1 changed files with 3 additions and 0 deletions
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3
hw/s390x/css.c
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@ -261,6 +261,9 @@ static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1)
ret.flags = tmp0.flags;
ret.count = be16_to_cpu(tmp0.count);
ret.cda = be16_to_cpu(tmp0.cda1) | (tmp0.cda0 << 16);
if ((ret.cmd_code & 0x0f) == CCW_CMD_TIC) {
ret.cmd_code &= 0x0f;
}
}
return ret;
}