Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

A few fixes that I've picked up.

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# gpg: Signature made Thu 09 Feb 2023 15:25:15 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
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* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  iotests/detect-zeroes-registered-buf: add new test
  qemu-io: add -r option to register I/O buffer
  qemu-io: use BdrvRequestFlags instead of int
  block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF
  virtio-blk: add missing AioContext lock
  vhost-user-fs: Back up vqs before cleaning up vhost_dev

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

block/io.c

@@ -1926,6 +1926,9 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
         if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) {
             flags |= BDRV_REQ_MAY_UNMAP;
         }
+
+        /* Can't use optimization hint with bufferless zero write */
+        flags &= ~BDRV_REQ_REGISTERED_BUF;
     }
 
     if (ret < 0) {

hw/block/virtio-blk.c

@@ -894,6 +894,10 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
     uint64_t capacity;
     int64_t length;
     int blk_size = conf->logical_block_size;
+    AioContext *ctx;
+
+    ctx = blk_get_aio_context(s->blk);
+    aio_context_acquire(ctx);
 
     blk_get_geometry(s->blk, &capacity);
     memset(&blkcfg, 0, sizeof(blkcfg));
@@ -917,6 +921,7 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
      * per track (cylinder).
      */
     length = blk_getlength(s->blk);
+    aio_context_release(ctx);
     if (length > 0 && length / conf->heads / conf->secs % blk_size) {
         blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
     } else {

hw/virtio/vhost-user-fs.c

@@ -273,6 +273,7 @@ static void vuf_device_unrealize(DeviceState *dev)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserFS *fs = VHOST_USER_FS(dev);
+    struct vhost_virtqueue *vhost_vqs = fs->vhost_dev.vqs;
     int i;
 
     /* This will stop vhost backend if appropriate. */
@@ -288,8 +289,7 @@ static void vuf_device_unrealize(DeviceState *dev)
     }
     g_free(fs->req_vqs);
     virtio_cleanup(vdev);
-    g_free(fs->vhost_dev.vqs);
-    fs->vhost_dev.vqs = NULL;
+    g_free(vhost_vqs);
 }
 
 static struct vhost_dev *vuf_get_vhost(VirtIODevice *vdev)

tests/qemu-iotests/tests/detect-zeroes-registered-buf

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# group: rw auto quick
+#
+# Check that detect-zeroes=unmap works on writes with registered I/O buffers.
+# This is a regression test for
+# https://gitlab.com/qemu-project/qemu/-/issues/1404 where I/O requests failed
+# unexpectedly.
+#
+# Copyright Red Hat
+#
+# 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=stefanha@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+cd ..
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2
+_supported_proto generic
+
+size=128M
+_make_test_img $size
+IMGSPEC="driver=$IMGFMT,file.filename=$TEST_IMG,discard=unmap,detect-zeroes=unmap"
+
+echo
+echo "== writing zero buffer to image =="
+QEMU_IO_OPTIONS="$QEMU_IO_OPTIONS_NO_FMT" $QEMU_IO -c "write -r -P 0 0 4k" --image-opts "$IMGSPEC" | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/tests/detect-zeroes-registered-buf.out

@@ -0,0 +1,7 @@
+QA output created by detect-zeroes-registered-buf
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+
+== writing zero buffer to image ==
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done