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05 April 2024, 19:05:47 UTC
Revision bc04d93ea30a0a8eb2a2648b848cef35d1f6f798 authored by Eli Cohen on 08 April 2021, 09:10:47 UTC, committed by Michael S. Tsirkin on 09 April 2021, 16:08:28 UTC 
vdpa/mlx5: Fix suspend/resume index restoration
 
When we suspend the VM, the VDPA interface will be reset. When the VM is
resumed again, clear_virtqueues() will clear the available and used
indices resulting in hardware virqtqueue objects becoming out of sync.
We can avoid this function alltogether since qemu will clear them if
required, e.g. when the VM went through a reboot.

Moreover, since the hw available and used indices should always be
identical on query and should be restored to the same value same value
for virtqueues that complete in order, we set the single value provided
by set_vq_state(). In get_vq_state() we return the value of hardware
used index.

Fixes: b35ccebe3ef7 ("vdpa/mlx5: Restore the hardware used index after change map")
Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210408091047.4269-6-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
1 parent 4b454a8
History
Tip revision: bc04d93ea30a0a8eb2a2648b848cef35d1f6f798 authored by Eli Cohen on 08 April 2021, 09:10:47 UTC
vdpa/mlx5: Fix suspend/resume index restoration
Tip revision: bc04d93
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