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[Qemu-devel] [PATCH 0/2] virtio-scsi: Fix QEMU hang with vIOMMU and ATS

From: Fam Zheng
Subject: [Qemu-devel] [PATCH 0/2] virtio-scsi: Fix QEMU hang with vIOMMU and ATS
Date: Mon, 10 Sep 2018 22:56:14 +0800

The first patch describes the bug and the reproducer.

The VQ poll handler that is called by mistake within virtio_scsi_dataplane_stop
enters a dead loop because it fails to detect an error state. Fix both sides of
the problem: the handler should break out from the loop if no progress can be
made due to virtio_error; the handler shouldn't be called in that situation in
the first place.

Fam Zheng (2):
  virtio: Return true from virtio_queue_empty if broken
  virtio-scsi/virtio-blk: Disable poll handlers when stopping vq handler

 hw/block/dataplane/virtio-blk.c | 2 ++
 hw/scsi/virtio-scsi-dataplane.c | 2 ++
 hw/virtio/virtio.c              | 8 ++++++++
 3 files changed, 12 insertions(+)


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