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2ae39a113a
xemu/hw/virtio
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Maxime Coquelin 2ae39a113a vhost: restore avail index from vring used index on disconnection 
vhost_virtqueue_stop() gets avail index value from the backend,
except if the backend is not responding.

It happens when the backend crashes, and in this case, internal
state of the virtio queue is inconsistent, making packets
to corrupt the vring state.

With a Linux guest, it results in following error message on
backend reconnection:

[   22.444905] virtio_net virtio0: output.0:id 0 is not a head!
[   22.446746] net enp0s3: Unexpected TXQ (0) queue failure: -5
[   22.476360] net enp0s3: Unexpected TXQ (0) queue failure: -5

Fixes: 283e2c2adc ("net: virtio-net discards TX data after link down")
Cc: qemu-stable@nongnu.org
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-12-01 19:05:58 +02:00
..
Makefile.objs stubs: move vhost stubs to stubs/vhost.o 2017-01-16 17:52:35 +01:00
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
vhost-backend.c vhost: fix a memory leak 2017-08-02 00:13:25 +03:00
vhost-stub.c stubs: move vhost stubs to stubs/vhost.o 2017-01-16 17:52:35 +01:00
vhost-user.c vhost-user: fix legacy cross-endian configurations 2017-08-02 00:13:25 +03:00
vhost-vsock.c migration: pre_save return int 2017-09-27 11:35:59 +01:00
vhost.c vhost: restore avail index from vring used index on disconnection 2017-12-01 19:05:58 +02:00
virtio-balloon.c Convert single line fprintf(.../n) to warn_report() 2017-09-19 14:09:34 +02:00
virtio-bus.c virtio: Fix error handling in virtio_bus_device_plugged 2017-03-22 17:54:32 +02:00
virtio-crypto-pci.c virtio-crypto: Convert to DEFINE_PROP_LINK 2017-07-14 12:04:43 +02:00
virtio-crypto.c virtio-crypto: Convert to DEFINE_PROP_LINK 2017-07-14 12:04:43 +02:00
virtio-mmio.c virtio-mmio: switch to linux headers 2017-01-18 22:59:53 +02:00
virtio-pci.c virtio-pci: Replace modern_as with direct access to modern_bar 2017-10-15 05:54:44 +03:00
virtio-pci.h virtio-pci: Replace modern_as with direct access to modern_bar 2017-10-15 05:54:44 +03:00
virtio-rng.c virtio-rng: Convert to DEFINE_PROP_LINK 2017-07-14 12:04:42 +02:00
virtio.c virtio: Add queue interface to restore avail index from vring used index 2017-12-01 19:05:58 +02:00