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| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-02-28 14:21:32 +0100 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2017-03-27 21:07:21 -0500 |
| commit | ce37df91f4f9a4577fb12f46b94dde93c19bd661 (patch) | |
| tree | cf0a133b80e769c8b26918d7c7de6e805e76bbfe /tests/test-opts-visitor.c | |
| parent | dc35a13747843688690d5779ef22f2a62dfd6d3b (diff) | |
| download | qemu-ce37df91f4f9a4577fb12f46b94dde93c19bd661.tar.gz | |
virtio: always use handle_aio_output if registered
Commit ad07cd6 ("virtio-scsi: always use dataplane path if ioeventfd is
active", 2016-10-30) and 9ffe337 ("virtio-blk: always use dataplane
path if ioeventfd is active", 2016-10-30) broke the virtio 1.0
indirect access registers.
The indirect access registers bypass the ioeventfd, so that virtio-blk
and virtio-scsi now repeatedly try to initialize dataplane instead of
triggering the guest->host EventNotifier. Detect the situation by
checking vq->handle_aio_output; if it is not NULL, trigger the
EventNotifier, which is how the device expects to get notifications
and in fact the only thread-safe manner to deliver them.
Fixes: ad07cd6
Fixes: 9ffe337
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit e49a6618400d11e51e30328dfe8d7cafce82d4bc)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Diffstat (limited to 'tests/test-opts-visitor.c')
0 files changed, 0 insertions, 0 deletions