Eugenio Pérez b4cca6d48e vdpa_sim: set last_used_idx as last_avail_idx in vdpasim_queue_ready ... Starting from an used_idx different than 0 is needed in use cases like virtual machine migration. Not doing so and letting the caller set an avail idx different than 0 causes destination device to try to use old buffers that source driver already recover and are not available anymore. Since vdpa_sim does not support receive inflight descriptors as a destination of a migration, let's set both avail_idx and used_idx the same at vq start. This is how vhost-user works in a VHOST_SET_VRING_BASE call. Although the simple fix is to set last_used_idx at vdpasim_set_vq_state, it would be reset at vdpasim_queue_ready. The last_avail_idx case is fixed with commit 0e84f918fa ("vdpa_sim: not reset state in vdpasim_queue_ready"). Since the only option is to make it equal to last_avail_idx, adding the only change needed here. This was discovered and tested live migrating the vdpa_sim_net device. Fixes: 2c53d0f64c ("vdpasim: vDPA device simulator") Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Message-Id: <20230302181857.925374-1-eperezma@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>		2023-03-13 02:29:12 -04:00
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Makefile	vdpa: add vdpa simulator for block device	2021-05-03 04:55:53 -04:00
vdpa_sim.c	vdpa_sim: set last_used_idx as last_avail_idx in vdpasim_queue_ready	2023-03-13 02:29:12 -04:00
vdpa_sim.h	vdpa_sim: get rid of DMA ops	2023-02-20 19:26:58 -05:00
vdpa_sim_blk.c	vdpasim: customize allocation size	2023-02-20 19:26:57 -05:00
vdpa_sim_net.c	vdpa: Fix a couple of spelling mistakes in some messages	2023-02-20 19:26:59 -05:00