s390/vfio_ccw: Implement a crw lock

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Unlike the channel_program struct, which covers synchronous I/O
submissions and asynchronous interrupts, the CRW region relies
exclusively on asynchronous events coming from hardware.

Implement a lock to manage the list of those payloads, to ensure
they are read cohesively.

Fixes: 3f02cb2fd9 ("vfio-ccw: Wire up the CRW irq and CRW region")
Cc: stable@vger.kernel.org
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@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 05:30:22 +02:00 • committed by Christian Borntraeger

parent 34f4feff3e

commit 16b0798024

4 changed files with 30 additions and 10 deletions

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26

drivers/s390/cio/vfio_ccw_chp.c

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6

drivers/s390/cio/vfio_ccw_drv.c

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4

drivers/s390/cio/vfio_ccw_ops.c

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4

drivers/s390/cio/vfio_ccw_private.h

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