Re: [RFC PATCH 0/1] iommu: Detach device from domain when removed from group

Joerg Roedel
2015-08-03T15:49:00Z

On Tue, Jul 28, 2015 at 07:55:55PM +0200, Gerald Schaefer wrote:
> On s390, this eventually leads to a kernel panic when binding the device
> again to its non-vfio PCI driver, because of the missing arch-specific
> cleanup in detach_dev. On x86, the detach_dev callback will also not be
> called directly, but there is a notifier that will catch
> BUS_NOTIFY_REMOVED_DEVICE and eventually do the cleanup. Other
> architectures w/o the notifier probably have at least some kind of memory
> leak in this scenario, so a general fix would be nice.

This notifier is not arch-specific, but registered against the bus the
iommu-ops are set for. Why does it not run on s390?

Joerg