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| author | Jason Gunthorpe <jgg@nvidia.com> | 2022-10-07 11:04:41 -0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2022-10-07 08:10:52 -0600 |
| commit | 3dd59a7dcb97e6e40d6385a1a3faa9392b6d184a (patch) | |
| tree | 1e03b6764480252a87cf4264fe3b2541d82684e9 /virt | |
| parent | 819da99a7360f7e197038d12f0eba626bde11856 (diff) | |
| download | linux-3dd59a7dcb97e6e40d6385a1a3faa9392b6d184a.tar.bz2 | |
vfio: Make the group FD disassociate from the iommu_group
Allow the vfio_group struct to exist with a NULL iommu_group pointer. When
the pointer is NULL the vfio_group users promise not to touch the
iommu_group. This allows a driver to be hot unplugged while userspace is
keeping the group FD open.
Remove all the code waiting for the group FD to close.
This fixes a userspace regression where we learned that virtnodedevd
leaves a group FD open even though the /dev/ node for it has been deleted
and all the drivers for it unplugged.
Fixes: ca5f21b25749 ("vfio: Follow a strict lifetime for struct iommu_group")
Reported-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/3-v2-15417f29324e+1c-vfio_group_disassociate_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions