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vfio/ccw: Remove UUID from s390 debug log

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As vfio-ccw devices are created/destroyed, the uuid of the associated
mdevs that are recorded in $S390DBF/vfio_ccw_msg/sprintf get lost.
This is because a pointer to the UUID is stored instead of the UUID
itself, and that memory may have been repurposed if/when the logs are
examined. The result is usually garbage UUID data in the logs, though
there is an outside chance of an oops happening here.

Simply remove the UUID from the traces, as the subchannel number will
provide useful configuration information for problem determination,
and is stored directly into the log instead of a pointer.

As we were the only consumer of mdev_uuid(), remove that too.

Cc: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Michael Kawano <mkawano@linux.ibm.com>
Fixes: 60e05d1cf0 ("vfio-ccw: add some logging")
Fixes: b7701dfbf9 ("vfio-ccw: Register a chp_event callback for vfio-ccw")
[farman: reworded commit message, added Fixes: tags]
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Link: https://lore.kernel.org/r/20220707135737.720765-2-farman@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Michael Kawano
2022-07-07 15:57:27 +02:00
committed by Alex Williamson
parent 7654a8881a
commit 3566ee1d77
4 changed files with 18 additions and 26 deletions
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5
include/linux/mdev.h
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@@ -65,11 +65,6 @@ struct mdev_driver {
struct device_driver driver;
};
static inline const guid_t *mdev_uuid(struct mdev_device *mdev)
{
return &mdev->uuid;
}
extern struct bus_type mdev_bus_type;
int mdev_register_device(struct device *dev, struct mdev_driver *mdev_driver);