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Michael S. Tsirkin 4174152771 Revert "vhost/net: Defer TX queue re-enable until after sendmsg"

This reverts commit 8c2e6b26ff. It tries
to defer the notification enabling by moving the logic out of the loop
after the vhost_tx_batch() when nothing new is spotted. This will
bring side effects as the new logic would be reused for several other
error conditions.

One example is the IOTLB: when there's an IOTLB miss, get_tx_bufs()
might return -EAGAIN and exit the loop and see there's still available
buffers, so it will queue the tx work again until userspace feed the
IOTLB entry correctly. This will slowdown the tx processing and
trigger the TX watchdog in the guest as reported in
https://lkml.org/lkml/2025/9/10/1596.

To fix, revert the change. A follow up patch will bring the performance
back in a safe way.

Reported-by: Jon Kohler <jon@nutanix.com>
Cc: stable@vger.kernel.org
Fixes: 8c2e6b26ff ("vhost/net: Defer TX queue re-enable until after sendmsg")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20250917063045.2042-2-jasowang@redhat.com>

2025-09-19 04:15:26 -04:00

iotlb.c

vhost_iotlb: split out IOTLB initialization

2022-05-31 12:44:28 -04:00

Kconfig

vhost: Reintroduce kthread API and add mode selection

2025-08-01 09:11:09 -04:00

Makefile

…

net.c

Revert "vhost/net: Defer TX queue re-enable until after sendmsg"

2025-09-19 04:15:26 -04:00