s390/sclp: 32 bit event mask compatibility mode

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Qemu before version 2.11 does not implement the architecture correctly,
and does not allow for a mask size of size different than 4.

This patch introduces a compatibility mode for such systems, forcing
the mask sizes to 4.

Since the mask size is currently still 4 anyway, this patch should have
no impact whatsoever by itself, but it will be needed when the mask size
is increased to 64 bits in the next patch.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

...

This commit is contained in:

Claudio Imbrenda 2018-01-23 16:50:43 +01:00 • committed by Martin Schwidefsky

parent b843563518

commit 0b0d1173d8

3 changed files with 33 additions and 8 deletions

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23

drivers/s390/char/sclp.c

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3

drivers/s390/char/sclp.h

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15

drivers/s390/char/sclp_early_core.c

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