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From 215a509da9a0a8918ab1bfbd0f6ccfb765578f0f Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Thu, 6 Jun 2019 19:15:22 +0100
Subject: [PATCH 5/8] virtio-scsi: Move BlockBackend back to the main
 AioContext on unplug

RH-Author: Markus Armbruster <armbru@redhat.com>
Message-id: <20190606191524.30797-2-armbru@redhat.com>
Patchwork-id: 88607
O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 1/3] virtio-scsi: Move BlockBackend back to the main AioContext on unplug
Bugzilla: 1673396 1673401
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

From: Alberto Garcia <berto@igalia.com>

This fixes a crash when attaching a disk to a SCSI device using
iothreads, then detaching it and reattaching it again. Test case
included.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit a6f230c8d13a7ff3a0c7f1097412f44bfd9eff0b)
[Trivial conflict in tests/qemu-iotests/group resolved]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/scsi/virtio-scsi.c      |  6 ++++
 tests/qemu-iotests/240     | 89 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/240.out | 18 ++++++++++
 tests/qemu-iotests/group   |  1 +
 4 files changed, 114 insertions(+)
 create mode 100755 tests/qemu-iotests/240
 create mode 100644 tests/qemu-iotests/240.out

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 52a3c1d..85073f6 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -841,6 +841,12 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         virtio_scsi_release(s);
     }
 
+    if (s->ctx) {
+        virtio_scsi_acquire(s);
+        blk_set_aio_context(sd->conf.blk, qemu_get_aio_context());
+        virtio_scsi_release(s);
+    }
+
     qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
 }
 
diff --git a/tests/qemu-iotests/240 b/tests/qemu-iotests/240
new file mode 100755
index 0000000..ead7ee0
--- /dev/null
+++ b/tests/qemu-iotests/240
@@ -0,0 +1,89 @@
+#!/bin/bash
+#
+# Test hot plugging and unplugging with iothreads
+#
+# Copyright (C) 2019 Igalia, S.L.
+# Author: Alberto Garcia <berto@igalia.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=berto@igalia.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt generic
+_supported_proto generic
+_supported_os Linux
+
+do_run_qemu()
+{
+    echo Testing: "$@"
+    $QEMU -nographic -qmp stdio -serial none "$@"
+    echo
+}
+
+# Remove QMP events from (pretty-printed) output. Doesn't handle
+# nested dicts correctly, but we don't get any of those in this test.
+_filter_qmp_events()
+{
+    tr '\n' '\t' | sed -e \
+	's/{\s*"timestamp":\s*{[^}]*},\s*"event":[^,}]*\(,\s*"data":\s*{[^}]*}\)\?\s*}\s*//g' \
+	| tr '\t' '\n'
+}
+
+run_qemu()
+{
+    do_run_qemu "$@" 2>&1 | _filter_qmp | _filter_qmp_events
+}
+
+case "$QEMU_DEFAULT_MACHINE" in
+  s390-ccw-virtio)
+      virtio_scsi=virtio-scsi-ccw
+      ;;
+  *)
+      virtio_scsi=virtio-scsi-pci
+      ;;
+esac
+
+echo
+echo === Unplug a SCSI disk and then plug it again ===
+echo
+
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add", "arguments": {"driver": "null-co", "node-name": "hd0"}}
+{ "execute": "object-add", "arguments": {"qom-type": "iothread", "id": "iothread0"}}
+{ "execute": "device_add", "arguments": {"id": "scsi0", "driver": "${virtio_scsi}", "iothread": "iothread0"}}
+{ "execute": "device_add", "arguments": {"id": "scsi-hd0", "driver": "scsi-hd", "drive": "hd0"}}
+{ "execute": "device_del", "arguments": {"id": "scsi-hd0"}}
+{ "execute": "device_add", "arguments": {"id": "scsi-hd0", "driver": "scsi-hd", "drive": "hd0"}}
+{ "execute": "device_del", "arguments": {"id": "scsi-hd0"}}
+{ "execute": "device_del", "arguments": {"id": "scsi0"}}
+{ "execute": "blockdev-del", "arguments": {"node-name": "hd0"}}
+{ "execute": "quit"}
+EOF
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/240.out b/tests/qemu-iotests/240.out
new file mode 100644
index 0000000..432d981
--- /dev/null
+++ b/tests/qemu-iotests/240.out
@@ -0,0 +1,18 @@
+QA output created by 240
+
+=== Unplug a SCSI disk and then plug it again ===
+
+Testing:
+QMP_VERSION
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+{"return": {}}
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 61c0f9c..5cbdc24 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -226,3 +226,4 @@
 231 auto quick
 232 auto quick
 234 auto quick migration
+240 auto quick
-- 
1.8.3.1