s390/vfio_ccw: Ensure first IDAW remains constant

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The first IDAW in a list does not need to be on a 2K/4K boundary
like all others, and so is read separately to accurately calculate
the size of the buffer needed to read the full IDAL.

Verify that the address found in the first IDAW is unchanged between
reads, to ensure a consistent set of IDAWs being worked with.

Fixes: 01aa26c672 ("s390/cio: Combine direct and indirect CCW paths")
Cc: stable@vger.kernel.org
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

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Eric Farman 2026-07-28 05:30:16 +02:00 • committed by Christian Borntraeger

parent a005b7f1a4

commit 565bef268d

2 changed files with 18 additions and 0 deletions

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16

drivers/s390/cio/vfio_ccw_cp.c

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2

drivers/s390/cio/vfio_ccw_cp.h

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