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vduse: Temporarily fail if control queue feature requested 

[ Upstream commit 56e71885b0349241c07631a7b979b61e81afab6a ]

Virtio-net driver control queue implementation is not safe
when used with VDUSE. If the VDUSE application does not
reply to control queue messages, it currently ends up
hanging the kernel thread sending this command.

Some work is on-going to make the control queue
implementation robust with VDUSE. Until it is completed,
let's fail features check if control-queue feature is
requested.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20240109111025.1320976-3-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Coquelin 2024-01-09 12:10:24 +01:00 committed by Greg Kroah-Hartman
parent 8d4d14536c
commit df475f71d4
1 changed files with 5 additions and 0 deletions
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5
drivers/vdpa/vdpa_user/vduse_dev.c
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@ -8,6 +8,7 @@
*
*/
#include "linux/virtio_net.h"
#include <linux/init.h>
#include <linux/module.h>
#include <linux/cdev.h>
@ -28,6 +29,7 @@
#include <uapi/linux/virtio_config.h>
#include <uapi/linux/virtio_ids.h>
#include <uapi/linux/virtio_blk.h>
#include <uapi/linux/virtio_ring.h>
#include <linux/mod_devicetable.h>
#include "iova_domain.h"
@ -1671,6 +1673,9 @@ static bool features_is_valid(struct vduse_dev_config *config)
if ((config->device_id == VIRTIO_ID_BLOCK) &&
(config->features & BIT_ULL(VIRTIO_BLK_F_CONFIG_WCE)))
return false;
else if ((config->device_id == VIRTIO_ID_NET) &&
(config->features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)))
return false;
return true;
}