Eli Cohen 1b6fc6f739 vdpa/mlx5: Avoid destroying MR on empty iotlb ... [ Upstream commit 08dbd5660232bede7916d8568003012c1182cc9a ] The current code treats an empty iotlb provdied in set_map() as a special case and destroy the memory region object. This must not be done since the virtqueue objects reference this MR. Doing so will cause the driver unload to emit errors and log timeouts caused by the firmware complaining on busy resources. This patch treats an empty iotlb as any other change of mapping. In this case, mlx5_vdpa_create_mr() will fail and the entire set_map() call to fail. This issue has not been encountered before but was seen to occur in a non-official version of qemu. Since qemu is a userspace program, the driver must protect against such case. Fixes: 94abbccdf2 ("vdpa/mlx5: Add shared memory registration code") Signed-off-by: Eli Cohen <elic@nvidia.com> Link: https://lore.kernel.org/r/20210811053713.66658-1-elic@nvidia.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-08-26 08:35:42 -04:00
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ifcvf	vdpa: ifcvf: free config irq in ifcvf_free_irq()	2020-08-26 08:13:59 -04:00
mlx5	vdpa/mlx5: Avoid destroying MR on empty iotlb	2021-08-26 08:35:42 -04:00
vdpa_sim	vdpa_sim: add get_config callback in vdpasim_dev_attr	2021-02-23 15:53:23 +01:00
Kconfig	vdpa: mlx5: fix vdpa/vhost dependencies	2020-12-02 04:09:56 -05:00
Makefile	vdpa/mlx5: Add support library for mlx5 VDPA implementation	2020-08-05 19:00:23 -04:00
vdpa.c	vdpa: remove hard coded virtq num	2020-08-05 18:39:18 -04:00