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vdpa: move file descriptor to vhost_vdpa_shared

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Next patches will register the vhost_vdpa memory listener while the VM
is migrating at the destination, so we can map the memory to the device
before stopping the VM at the source.  The main goal is to reduce the
downtime.

However, the destination QEMU is unaware of which vhost_vdpa device will
register its memory_listener.  If the source guest has CVQ enabled, it
will be the CVQ device.  Otherwise, it  will be the first one.

Move the file descriptor to VhostVDPAShared so all vhost_vdpa can use
it, rather than always in the first / last vhost_vdpa.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20231221174322.3130442-7-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2023-12-21 18:43:15 +01:00 • committed by Michael S. Tsirkin
parent e36b9992fa
commit f12b2498e5
4 changed files with 13 additions and 16 deletions
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2
hw/virtio/vdpa-dev.c
View file

@ -66,7 +66,6 @@ static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
if (*errp) {
return;
}
v->vdpa.device_fd = v->vhostfd;
v->vdev_id = vhost_vdpa_device_get_u32(v->vhostfd,
VHOST_VDPA_GET_DEVICE_ID, errp);
@ -115,6 +114,7 @@ static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
goto free_vqs;
}
v->vdpa.shared = g_new0(VhostVDPAShared, 1);
v->vdpa.shared->device_fd = v->vhostfd;
v->vdpa.shared->iova_range = iova_range;
ret = vhost_dev_init(&v->dev, &v->vdpa, VHOST_BACKEND_TYPE_VDPA, 0, NULL);