Block layer patches

- vhost-user-blk: Fix error handling during initialisation
 - Add test cases for the vhost-user-blk export
 - Fix leaked Transaction objects
 - qcow2: Expose dirty bit in 'qemu-img info'
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches

- vhost-user-blk: Fix error handling during initialisation
- Add test cases for the vhost-user-blk export
- Fix leaked Transaction objects
- qcow2: Expose dirty bit in 'qemu-img info'

# gpg: Signature made Tue 18 May 2021 11:57:46 BST
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  vhost-user-blk: Check that num-queues is supported by backend
  virtio: Fail if iommu_platform is requested, but unsupported
  vhost-user-blk: Get more feature flags from vhost device
  vhost-user-blk: Improve error reporting in realize
  vhost-user-blk: Don't reconnect during initialisation
  vhost-user-blk: Make sure to set Error on realize failure
  vhost-user-blk-test: test discard/write zeroes invalid inputs
  tests/qtest: add multi-queue test case to vhost-user-blk-test
  test: new qTest case to test the vhost-user-blk-server
  block/export: improve vu_blk_sect_range_ok()
  block: Fix Transaction leak in bdrv_reopen_multiple()
  block: Fix Transaction leak in bdrv_root_attach_child()
  qcow2: set bdi->is_dirty

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

MAINTAINERS

@@ -3245,6 +3245,8 @@ F: block/export/vhost-user-blk-server.c
 F: block/export/vhost-user-blk-server.h
 F: include/qemu/vhost-user-server.h
 F: tests/qtest/libqos/vhost-user-blk.c
+F: tests/qtest/libqos/vhost-user-blk.h
+F: tests/qtest/vhost-user-blk-test.c
 F: util/vhost-user-server.c
 
 FUSE block device exports

block.c

@@ -2916,13 +2916,14 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
                                    child_role, perm, shared_perm, opaque,
                                    &child, tran, errp);
     if (ret < 0) {
-        bdrv_unref(child_bs);
+        assert(child == NULL);
-        return NULL;
+        goto out;
     }
 
     ret = bdrv_refresh_perms(child_bs, errp);
-    tran_finalize(tran, ret);
 
+out:
+    tran_finalize(tran, ret);
     bdrv_unref(child_bs);
     return child;
 }
@@ -4049,7 +4050,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
         ret = bdrv_flush(bs_entry->state.bs);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Error flushing drive");
-            goto cleanup;
+            goto abort;
         }
     }
 

block/export/vhost-user-blk-server.c

@@ -70,9 +70,16 @@ static void vu_blk_req_complete(VuBlkReq *req)
 static bool vu_blk_sect_range_ok(VuBlkExport *vexp, uint64_t sector,
                                  size_t size)
 {
-    uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
+    uint64_t nb_sectors;
     uint64_t total_sectors;
 
+    if (size % VIRTIO_BLK_SECTOR_SIZE) {
+        return false;
+    }
+
+    nb_sectors = size >> VIRTIO_BLK_SECTOR_BITS;
+
+    QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != VIRTIO_BLK_SECTOR_SIZE);
     if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
         return false;
     }

block/qcow2.c

@@ -5089,6 +5089,7 @@ static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
     BDRVQcow2State *s = bs->opaque;
     bdi->cluster_size = s->cluster_size;
     bdi->vm_state_offset = qcow2_vm_state_offset(s);
+    bdi->is_dirty = s->incompatible_features & QCOW2_INCOMPAT_DIRTY;
     return 0;
 }
 

hw/block/vhost-user-blk.c

@@ -47,9 +47,13 @@ static const int user_feature_bits[] = {
     VIRTIO_RING_F_INDIRECT_DESC,
     VIRTIO_RING_F_EVENT_IDX,
     VIRTIO_F_NOTIFY_ON_EMPTY,
+    VIRTIO_F_RING_PACKED,
+    VIRTIO_F_IOMMU_PLATFORM,
     VHOST_INVALID_FEATURE_BIT
 };
 
+static void vhost_user_blk_event(void *opaque, QEMUChrEvent event);
+
 static void vhost_user_blk_update_config(VirtIODevice *vdev, uint8_t *config)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
@@ -309,7 +313,7 @@ static void vhost_user_blk_reset(VirtIODevice *vdev)
     vhost_dev_free_inflight(s->inflight);
 }
 
-static int vhost_user_blk_connect(DeviceState *dev)
+static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
@@ -320,6 +324,7 @@ static int vhost_user_blk_connect(DeviceState *dev)
     }
     s->connected = true;
 
+    s->dev.num_queues = s->num_queues;
     s->dev.nvqs = s->num_queues;
     s->dev.vqs = s->vhost_vqs;
     s->dev.vq_index = 0;
@@ -329,8 +334,7 @@ static int vhost_user_blk_connect(DeviceState *dev)
 
     ret = vhost_dev_init(&s->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
     if (ret < 0) {
-        error_report("vhost-user-blk: vhost initialization failed: %s",
+        error_setg_errno(errp, -ret, "vhost initialization failed");
-                     strerror(-ret));
         return ret;
     }
 
@@ -338,8 +342,7 @@ static int vhost_user_blk_connect(DeviceState *dev)
     if (virtio_device_started(vdev, vdev->status)) {
         ret = vhost_user_blk_start(vdev);
         if (ret < 0) {
-            error_report("vhost-user-blk: vhost start failed: %s",
+            error_setg_errno(errp, -ret, "vhost start failed");
-                         strerror(-ret));
             return ret;
         }
     }
@@ -362,19 +365,6 @@ static void vhost_user_blk_disconnect(DeviceState *dev)
     vhost_dev_cleanup(&s->dev);
 }
 
-static void vhost_user_blk_event(void *opaque, QEMUChrEvent event,
-                                 bool realized);
-
-static void vhost_user_blk_event_realize(void *opaque, QEMUChrEvent event)
-{
-    vhost_user_blk_event(opaque, event, false);
-}
-
-static void vhost_user_blk_event_oper(void *opaque, QEMUChrEvent event)
-{
-    vhost_user_blk_event(opaque, event, true);
-}
-
 static void vhost_user_blk_chr_closed_bh(void *opaque)
 {
     DeviceState *dev = opaque;
@@ -382,36 +372,27 @@ static void vhost_user_blk_chr_closed_bh(void *opaque)
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
 
     vhost_user_blk_disconnect(dev);
-    qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL,
+    qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event,
-            vhost_user_blk_event_oper, NULL, opaque, NULL, true);
+                             NULL, opaque, NULL, true);
 }
 
-static void vhost_user_blk_event(void *opaque, QEMUChrEvent event,
+static void vhost_user_blk_event(void *opaque, QEMUChrEvent event)
-                                 bool realized)
 {
     DeviceState *dev = opaque;
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
+    Error *local_err = NULL;
 
     switch (event) {
     case CHR_EVENT_OPENED:
-        if (vhost_user_blk_connect(dev) < 0) {
+        if (vhost_user_blk_connect(dev, &local_err) < 0) {
+            error_report_err(local_err);
             qemu_chr_fe_disconnect(&s->chardev);
             return;
         }
         break;
     case CHR_EVENT_CLOSED:
-        /*
+        if (!runstate_check(RUN_STATE_SHUTDOWN)) {
-         * Closing the connection should happen differently on device
-         * initialization and operation stages.
-         * On initalization, we want to re-start vhost_dev initialization
-         * from the very beginning right away when the connection is closed,
-         * so we clean up vhost_dev on each connection closing.
-         * On operation, we want to postpone vhost_dev cleanup to let the
-         * other code perform its own cleanup sequence using vhost_dev data
-         * (e.g. vhost_dev_set_log).
-         */
-        if (realized && !runstate_check(RUN_STATE_SHUTDOWN)) {
             /*
              * A close event may happen during a read/write, but vhost
              * code assumes the vhost_dev remains setup, so delay the
@@ -431,8 +412,6 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent event,
              * knowing its type (in this case vhost-user).
              */
             s->dev.started = false;
-        } else {
-            vhost_user_blk_disconnect(dev);
         }
         break;
     case CHR_EVENT_BREAK:
@@ -447,11 +426,10 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
-    Error *err = NULL;
     int i, ret;
 
     if (!s->chardev.chr) {
-        error_setg(errp, "vhost-user-blk: chardev is mandatory");
+        error_setg(errp, "chardev is mandatory");
         return;
     }
 
@@ -459,16 +437,16 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
         s->num_queues = 1;
     }
     if (!s->num_queues || s->num_queues > VIRTIO_QUEUE_MAX) {
-        error_setg(errp, "vhost-user-blk: invalid number of IO queues");
+        error_setg(errp, "invalid number of IO queues");
         return;
     }
 
     if (!s->queue_size) {
-        error_setg(errp, "vhost-user-blk: queue size must be non-zero");
+        error_setg(errp, "queue size must be non-zero");
         return;
     }
     if (s->queue_size > VIRTQUEUE_MAX_SIZE) {
-        error_setg(errp, "vhost-user-blk: queue size must not exceed %d",
+        error_setg(errp, "queue size must not exceed %d",
                    VIRTQUEUE_MAX_SIZE);
         return;
     }
@@ -490,34 +468,31 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
     s->vhost_vqs = g_new0(struct vhost_virtqueue, s->num_queues);
     s->connected = false;
 
-    qemu_chr_fe_set_handlers(&s->chardev,  NULL, NULL,
+    if (qemu_chr_fe_wait_connected(&s->chardev, errp) < 0) {
-                             vhost_user_blk_event_realize, NULL, (void *)dev,
-                             NULL, true);
-
-reconnect:
-    if (qemu_chr_fe_wait_connected(&s->chardev, &err) < 0) {
-        error_report_err(err);
         goto virtio_err;
     }
 
-    /* check whether vhost_user_blk_connect() failed or not */
+    if (vhost_user_blk_connect(dev, errp) < 0) {
-    if (!s->connected) {
+        qemu_chr_fe_disconnect(&s->chardev);
-        goto reconnect;
+        goto virtio_err;
     }
+    assert(s->connected);
 
     ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg,
                                sizeof(struct virtio_blk_config));
     if (ret < 0) {
-        error_report("vhost-user-blk: get block config failed");
+        error_setg(errp, "vhost-user-blk: get block config failed");
-        goto reconnect;
+        goto vhost_err;
     }
 
-    /* we're fully initialized, now we can operate, so change the handler */
+    /* we're fully initialized, now we can operate, so add the handler */
     qemu_chr_fe_set_handlers(&s->chardev,  NULL, NULL,
-                             vhost_user_blk_event_oper, NULL, (void *)dev,
+                             vhost_user_blk_event, NULL, (void *)dev,
                              NULL, true);
     return;
 
+vhost_err:
+    vhost_dev_cleanup(&s->dev);
 virtio_err:
     g_free(s->vhost_vqs);
     s->vhost_vqs = NULL;

hw/virtio/vhost-user.c

@@ -1909,6 +1909,11 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
                 return err;
             }
         }
+        if (dev->num_queues && dev->max_queues < dev->num_queues) {
+            error_report("The maximum number of queues supported by the "
+                         "backend is %" PRIu64, dev->max_queues);
+            return -EINVAL;
+        }
 
         if (virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM) &&
                 !(virtio_has_feature(dev->protocol_features,

hw/virtio/virtio-bus.c

@@ -69,6 +69,11 @@ void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp)
         return;
     }
 
+    if (has_iommu && !virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
+        error_setg(errp, "iommu_platform=true is not supported by the device");
+        return;
+    }
+
     if (klass->device_plugged != NULL) {
         klass->device_plugged(qbus->parent, &local_err);
     }

include/hw/virtio/vhost.h

@@ -74,6 +74,8 @@ struct vhost_dev {
     int nvqs;
     /* the first virtqueue which would be used by this vhost dev */
     int vq_index;
+    /* if non-zero, minimum required value for max_queues */
+    int num_queues;
     uint64_t features;
     uint64_t acked_features;
     uint64_t backend_features;

tests/qtest/libqos/meson.build

@@ -32,6 +32,7 @@ libqos_srcs = files('../libqtest.c',
         'virtio-9p.c',
         'virtio-balloon.c',
         'virtio-blk.c',
+        'vhost-user-blk.c',
         'virtio-mmio.c',
         'virtio-net.c',
         'virtio-pci.c',

tests/qtest/libqos/vhost-user-blk.c

@@ -0,0 +1,130 @@
+/*
+ * libqos driver framework
+ *
+ * Based on tests/qtest/libqos/virtio-blk.c
+ *
+ * Copyright (c) 2020 Coiby Xu <coiby.xu@gmail.com>
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+#include "qemu/module.h"
+#include "standard-headers/linux/virtio_blk.h"
+#include "vhost-user-blk.h"
+
+#define PCI_SLOT                0x04
+#define PCI_FN                  0x00
+
+/* virtio-blk-device */
+static void *qvhost_user_blk_get_driver(QVhostUserBlk *v_blk,
+                                    const char *interface)
+{
+    if (!g_strcmp0(interface, "vhost-user-blk")) {
+        return v_blk;
+    }
+    if (!g_strcmp0(interface, "virtio")) {
+        return v_blk->vdev;
+    }
+
+    fprintf(stderr, "%s not present in vhost-user-blk-device\n", interface);
+    g_assert_not_reached();
+}
+
+static void *qvhost_user_blk_device_get_driver(void *object,
+                                           const char *interface)
+{
+    QVhostUserBlkDevice *v_blk = object;
+    return qvhost_user_blk_get_driver(&v_blk->blk, interface);
+}
+
+static void *vhost_user_blk_device_create(void *virtio_dev,
+                                      QGuestAllocator *t_alloc,
+                                      void *addr)
+{
+    QVhostUserBlkDevice *vhost_user_blk = g_new0(QVhostUserBlkDevice, 1);
+    QVhostUserBlk *interface = &vhost_user_blk->blk;
+
+    interface->vdev = virtio_dev;
+
+    vhost_user_blk->obj.get_driver = qvhost_user_blk_device_get_driver;
+
+    return &vhost_user_blk->obj;
+}
+
+/* virtio-blk-pci */
+static void *qvhost_user_blk_pci_get_driver(void *object, const char *interface)
+{
+    QVhostUserBlkPCI *v_blk = object;
+    if (!g_strcmp0(interface, "pci-device")) {
+        return v_blk->pci_vdev.pdev;
+    }
+    return qvhost_user_blk_get_driver(&v_blk->blk, interface);
+}
+
+static void *vhost_user_blk_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
+                                      void *addr)
+{
+    QVhostUserBlkPCI *vhost_user_blk = g_new0(QVhostUserBlkPCI, 1);
+    QVhostUserBlk *interface = &vhost_user_blk->blk;
+    QOSGraphObject *obj = &vhost_user_blk->pci_vdev.obj;
+
+    virtio_pci_init(&vhost_user_blk->pci_vdev, pci_bus, addr);
+    interface->vdev = &vhost_user_blk->pci_vdev.vdev;
+
+    g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_BLOCK);
+
+    obj->get_driver = qvhost_user_blk_pci_get_driver;
+
+    return obj;
+}
+
+static void vhost_user_blk_register_nodes(void)
+{
+    /*
+     * FIXME: every test using these two nodes needs to setup a
+     * -drive,id=drive0 otherwise QEMU is not going to start.
+     * Therefore, we do not include "produces" edge for virtio
+     * and pci-device yet.
+     */
+
+    char *arg = g_strdup_printf("id=drv0,chardev=char1,addr=%x.%x",
+                                PCI_SLOT, PCI_FN);
+
+    QPCIAddress addr = {
+        .devfn = QPCI_DEVFN(PCI_SLOT, PCI_FN),
+    };
+
+    QOSGraphEdgeOptions opts = { };
+
+    /* virtio-blk-device */
+    /** opts.extra_device_opts = "drive=drive0"; */
+    qos_node_create_driver("vhost-user-blk-device",
+                           vhost_user_blk_device_create);
+    qos_node_consumes("vhost-user-blk-device", "virtio-bus", &opts);
+    qos_node_produces("vhost-user-blk-device", "vhost-user-blk");
+
+    /* virtio-blk-pci */
+    opts.extra_device_opts = arg;
+    add_qpci_address(&opts, &addr);
+    qos_node_create_driver("vhost-user-blk-pci", vhost_user_blk_pci_create);
+    qos_node_consumes("vhost-user-blk-pci", "pci-bus", &opts);
+    qos_node_produces("vhost-user-blk-pci", "vhost-user-blk");
+
+    g_free(arg);
+}
+
+libqos_init(vhost_user_blk_register_nodes);

tests/qtest/libqos/vhost-user-blk.h

@@ -0,0 +1,48 @@
+/*
+ * libqos driver framework
+ *
+ * Based on tests/qtest/libqos/virtio-blk.c
+ *
+ * Copyright (c) 2020 Coiby Xu <coiby.xu@gmail.com>
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#ifndef TESTS_LIBQOS_VHOST_USER_BLK_H
+#define TESTS_LIBQOS_VHOST_USER_BLK_H
+
+#include "qgraph.h"
+#include "virtio.h"
+#include "virtio-pci.h"
+
+typedef struct QVhostUserBlk QVhostUserBlk;
+typedef struct QVhostUserBlkPCI QVhostUserBlkPCI;
+typedef struct QVhostUserBlkDevice QVhostUserBlkDevice;
+
+struct QVhostUserBlk {
+    QVirtioDevice *vdev;
+};
+
+struct QVhostUserBlkPCI {
+    QVirtioPCIDevice pci_vdev;
+    QVhostUserBlk blk;
+};
+
+struct QVhostUserBlkDevice {
+    QOSGraphObject obj;
+    QVhostUserBlk blk;
+};
+
+#endif

tests/qtest/meson.build

@@ -231,6 +231,9 @@ if have_virtfs
   qos_test_ss.add(files('virtio-9p-test.c'))
 endif
 qos_test_ss.add(when: 'CONFIG_VHOST_USER', if_true: files('vhost-user-test.c'))
+if have_tools and have_vhost_user_blk_server
+  qos_test_ss.add(files('vhost-user-blk-test.c'))
+endif
 
 tpmemu_files = ['tpm-emu.c', 'tpm-util.c', 'tpm-tests.c']
 
@@ -269,6 +272,7 @@ foreach dir : target_dirs
   endif
   qtest_env.set('G_TEST_DBUS_DAEMON', meson.source_root() / 'tests/dbus-vmstate-daemon.sh')
   qtest_env.set('QTEST_QEMU_BINARY', './qemu-system-' + target_base)
+  qtest_env.set('QTEST_QEMU_STORAGE_DAEMON_BINARY', './storage-daemon/qemu-storage-daemon')
   
   foreach test : target_qtests
     # Executables are shared across targets, declare them only the first time we

tests/qtest/vhost-user-blk-test.c

@@ -0,0 +1,989 @@
+/*
+ * QTest testcase for Vhost-user Block Device
+ *
+ * Based on tests/qtest//virtio-blk-test.c
+
+ * Copyright (c) 2014 SUSE LINUX Products GmbH
+ * Copyright (c) 2014 Marc Marí
+ * Copyright (c) 2020 Coiby Xu
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest-single.h"
+#include "qemu/bswap.h"
+#include "qemu/module.h"
+#include "standard-headers/linux/virtio_blk.h"
+#include "standard-headers/linux/virtio_pci.h"
+#include "libqos/qgraph.h"
+#include "libqos/vhost-user-blk.h"
+#include "libqos/libqos-pc.h"
+
+#define TEST_IMAGE_SIZE         (64 * 1024 * 1024)
+#define QVIRTIO_BLK_TIMEOUT_US  (30 * 1000 * 1000)
+#define PCI_SLOT_HP             0x06
+
+typedef struct {
+    pid_t pid;
+} QemuStorageDaemonState;
+
+typedef struct QVirtioBlkReq {
+    uint32_t type;
+    uint32_t ioprio;
+    uint64_t sector;
+    char *data;
+    uint8_t status;
+} QVirtioBlkReq;
+
+#ifdef HOST_WORDS_BIGENDIAN
+static const bool host_is_big_endian = true;
+#else
+static const bool host_is_big_endian; /* false */
+#endif
+
+static inline void virtio_blk_fix_request(QVirtioDevice *d, QVirtioBlkReq *req)
+{
+    if (qvirtio_is_big_endian(d) != host_is_big_endian) {
+        req->type = bswap32(req->type);
+        req->ioprio = bswap32(req->ioprio);
+        req->sector = bswap64(req->sector);
+    }
+}
+
+static inline void virtio_blk_fix_dwz_hdr(QVirtioDevice *d,
+    struct virtio_blk_discard_write_zeroes *dwz_hdr)
+{
+    if (qvirtio_is_big_endian(d) != host_is_big_endian) {
+        dwz_hdr->sector = bswap64(dwz_hdr->sector);
+        dwz_hdr->num_sectors = bswap32(dwz_hdr->num_sectors);
+        dwz_hdr->flags = bswap32(dwz_hdr->flags);
+    }
+}
+
+static uint64_t virtio_blk_request(QGuestAllocator *alloc, QVirtioDevice *d,
+                                   QVirtioBlkReq *req, uint64_t data_size)
+{
+    uint64_t addr;
+    uint8_t status = 0xFF;
+    QTestState *qts = global_qtest;
+
+    switch (req->type) {
+    case VIRTIO_BLK_T_IN:
+    case VIRTIO_BLK_T_OUT:
+        g_assert_cmpuint(data_size % 512, ==, 0);
+        break;
+    case VIRTIO_BLK_T_DISCARD:
+    case VIRTIO_BLK_T_WRITE_ZEROES:
+        g_assert_cmpuint(data_size %
+                         sizeof(struct virtio_blk_discard_write_zeroes), ==, 0);
+        break;
+    default:
+        g_assert_cmpuint(data_size, ==, 0);
+    }
+
+    addr = guest_alloc(alloc, sizeof(*req) + data_size);
+
+    virtio_blk_fix_request(d, req);
+
+    qtest_memwrite(qts, addr, req, 16);
+    qtest_memwrite(qts, addr + 16, req->data, data_size);
+    qtest_memwrite(qts, addr + 16 + data_size, &status, sizeof(status));
+
+    return addr;
+}
+
+static void test_invalid_discard_write_zeroes(QVirtioDevice *dev,
+                                              QGuestAllocator *alloc,
+                                              QTestState *qts,
+                                              QVirtQueue *vq,
+                                              uint32_t type)
+{
+    QVirtioBlkReq req;
+    struct virtio_blk_discard_write_zeroes dwz_hdr;
+    struct virtio_blk_discard_write_zeroes dwz_hdr2[2];
+    uint64_t req_addr;
+    uint32_t free_head;
+    uint8_t status;
+
+    /* More than one dwz is not supported */
+    req.type = type;
+    req.data = (char *) dwz_hdr2;
+    dwz_hdr2[0].sector = 0;
+    dwz_hdr2[0].num_sectors = 1;
+    dwz_hdr2[0].flags = 0;
+    dwz_hdr2[1].sector = 1;
+    dwz_hdr2[1].num_sectors = 1;
+    dwz_hdr2[1].flags = 0;
+
+    virtio_blk_fix_dwz_hdr(dev, &dwz_hdr2[0]);
+    virtio_blk_fix_dwz_hdr(dev, &dwz_hdr2[1]);
+
+    req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr2));
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr2), false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr2), 1, true,
+                   false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 16 + sizeof(dwz_hdr2));
+    g_assert_cmpint(status, ==, VIRTIO_BLK_S_UNSUPP);
+
+    guest_free(alloc, req_addr);
+
+    /* num_sectors must be less than config->max_write_zeroes_sectors */
+    req.type = type;
+    req.data = (char *) &dwz_hdr;
+    dwz_hdr.sector = 0;
+    dwz_hdr.num_sectors = 0xffffffff;
+    dwz_hdr.flags = 0;
+
+    virtio_blk_fix_dwz_hdr(dev, &dwz_hdr);
+
+    req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr));
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr), false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr), 1, true,
+                   false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 16 + sizeof(dwz_hdr));
+    g_assert_cmpint(status, ==, VIRTIO_BLK_S_IOERR);
+
+    guest_free(alloc, req_addr);
+
+    /* sector must be less than the device capacity */
+    req.type = type;
+    req.data = (char *) &dwz_hdr;
+    dwz_hdr.sector = TEST_IMAGE_SIZE / 512 + 1;
+    dwz_hdr.num_sectors = 1;
+    dwz_hdr.flags = 0;
+
+    virtio_blk_fix_dwz_hdr(dev, &dwz_hdr);
+
+    req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr));
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr), false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr), 1, true,
+                   false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 16 + sizeof(dwz_hdr));
+    g_assert_cmpint(status, ==, VIRTIO_BLK_S_IOERR);
+
+    guest_free(alloc, req_addr);
+
+    /* reserved flag bits must be zero */
+    req.type = type;
+    req.data = (char *) &dwz_hdr;
+    dwz_hdr.sector = 0;
+    dwz_hdr.num_sectors = 1;
+    dwz_hdr.flags = ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP;
+
+    virtio_blk_fix_dwz_hdr(dev, &dwz_hdr);
+
+    req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr));
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr), false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr), 1, true,
+                   false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 16 + sizeof(dwz_hdr));
+    g_assert_cmpint(status, ==, VIRTIO_BLK_S_UNSUPP);
+
+    guest_free(alloc, req_addr);
+}
+
+/* Returns the request virtqueue so the caller can perform further tests */
+static QVirtQueue *test_basic(QVirtioDevice *dev, QGuestAllocator *alloc)
+{
+    QVirtioBlkReq req;
+    uint64_t req_addr;
+    uint64_t capacity;
+    uint64_t features;
+    uint32_t free_head;
+    uint8_t status;
+    char *data;
+    QTestState *qts = global_qtest;
+    QVirtQueue *vq;
+
+    features = qvirtio_get_features(dev);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                    (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                    (1u << VIRTIO_RING_F_EVENT_IDX) |
+                    (1u << VIRTIO_BLK_F_SCSI));
+    qvirtio_set_features(dev, features);
+
+    capacity = qvirtio_config_readq(dev, 0);
+    g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
+
+    vq = qvirtqueue_setup(dev, alloc, 0);
+
+    qvirtio_set_driver_ok(dev);
+
+    /* Write and read with 3 descriptor layout */
+    /* Write request */
+    req.type = VIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, 512, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    guest_free(alloc, req_addr);
+
+    /* Read request */
+    req.type = VIRTIO_BLK_T_IN;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+
+    req_addr = virtio_blk_request(alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, 512, true, true);
+    qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    data = g_malloc0(512);
+    qtest_memread(qts, req_addr + 16, data, 512);
+    g_assert_cmpstr(data, ==, "TEST");
+    g_free(data);
+
+    guest_free(alloc, req_addr);
+
+    if (features & (1u << VIRTIO_BLK_F_WRITE_ZEROES)) {
+        struct virtio_blk_discard_write_zeroes dwz_hdr;
+        void *expected;
+
+        /*
+         * WRITE_ZEROES request on the same sector of previous test where
+         * we wrote "TEST".
+         */
+        req.type = VIRTIO_BLK_T_WRITE_ZEROES;
+        req.data = (char *) &dwz_hdr;
+        dwz_hdr.sector = 0;
+        dwz_hdr.num_sectors = 1;
+        dwz_hdr.flags = 0;
+
+        virtio_blk_fix_dwz_hdr(dev, &dwz_hdr);
+
+        req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr));
+
+        free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr), false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr), 1, true,
+                       false);
+
+        qvirtqueue_kick(qts, dev, vq, free_head);
+
+        qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
+        status = readb(req_addr + 16 + sizeof(dwz_hdr));
+        g_assert_cmpint(status, ==, 0);
+
+        guest_free(alloc, req_addr);
+
+        /* Read request to check if the sector contains all zeroes */
+        req.type = VIRTIO_BLK_T_IN;
+        req.ioprio = 1;
+        req.sector = 0;
+        req.data = g_malloc0(512);
+
+        req_addr = virtio_blk_request(alloc, dev, &req, 512);
+
+        g_free(req.data);
+
+        free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16, 512, true, true);
+        qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+
+        qvirtqueue_kick(qts, dev, vq, free_head);
+
+        qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
+        status = readb(req_addr + 528);
+        g_assert_cmpint(status, ==, 0);
+
+        data = g_malloc(512);
+        expected = g_malloc0(512);
+        qtest_memread(qts, req_addr + 16, data, 512);
+        g_assert_cmpmem(data, 512, expected, 512);
+        g_free(expected);
+        g_free(data);
+
+        guest_free(alloc, req_addr);
+
+        test_invalid_discard_write_zeroes(dev, alloc, qts, vq,
+                                          VIRTIO_BLK_T_WRITE_ZEROES);
+    }
+
+    if (features & (1u << VIRTIO_BLK_F_DISCARD)) {
+        struct virtio_blk_discard_write_zeroes dwz_hdr;
+
+        req.type = VIRTIO_BLK_T_DISCARD;
+        req.data = (char *) &dwz_hdr;
+        dwz_hdr.sector = 0;
+        dwz_hdr.num_sectors = 1;
+        dwz_hdr.flags = 0;
+
+        virtio_blk_fix_dwz_hdr(dev, &dwz_hdr);
+
+        req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr));
+
+        free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16, sizeof(dwz_hdr), false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16 + sizeof(dwz_hdr),
+                       1, true, false);
+
+        qvirtqueue_kick(qts, dev, vq, free_head);
+
+        qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
+        status = readb(req_addr + 16 + sizeof(dwz_hdr));
+        g_assert_cmpint(status, ==, 0);
+
+        guest_free(alloc, req_addr);
+
+        test_invalid_discard_write_zeroes(dev, alloc, qts, vq,
+                                          VIRTIO_BLK_T_DISCARD);
+    }
+
+    if (features & (1u << VIRTIO_F_ANY_LAYOUT)) {
+        /* Write and read with 2 descriptor layout */
+        /* Write request */
+        req.type = VIRTIO_BLK_T_OUT;
+        req.ioprio = 1;
+        req.sector = 1;
+        req.data = g_malloc0(512);
+        strcpy(req.data, "TEST");
+
+        req_addr = virtio_blk_request(alloc, dev, &req, 512);
+
+        g_free(req.data);
+
+        free_head = qvirtqueue_add(qts, vq, req_addr, 528, false, true);
+        qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+        qvirtqueue_kick(qts, dev, vq, free_head);
+
+        qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
+        status = readb(req_addr + 528);
+        g_assert_cmpint(status, ==, 0);
+
+        guest_free(alloc, req_addr);
+
+        /* Read request */
+        req.type = VIRTIO_BLK_T_IN;
+        req.ioprio = 1;
+        req.sector = 1;
+        req.data = g_malloc0(512);
+
+        req_addr = virtio_blk_request(alloc, dev, &req, 512);
+
+        g_free(req.data);
+
+        free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+        qvirtqueue_add(qts, vq, req_addr + 16, 513, true, false);
+
+        qvirtqueue_kick(qts, dev, vq, free_head);
+
+        qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
+        status = readb(req_addr + 528);
+        g_assert_cmpint(status, ==, 0);
+
+        data = g_malloc0(512);
+        qtest_memread(qts, req_addr + 16, data, 512);
+        g_assert_cmpstr(data, ==, "TEST");
+        g_free(data);
+
+        guest_free(alloc, req_addr);
+    }
+
+    return vq;
+}
+
+static void basic(void *obj, void *data, QGuestAllocator *t_alloc)
+{
+    QVhostUserBlk *blk_if = obj;
+    QVirtQueue *vq;
+
+    vq = test_basic(blk_if->vdev, t_alloc);
+    qvirtqueue_cleanup(blk_if->vdev->bus, vq, t_alloc);
+
+}
+
+static void indirect(void *obj, void *u_data, QGuestAllocator *t_alloc)
+{
+    QVirtQueue *vq;
+    QVhostUserBlk *blk_if = obj;
+    QVirtioDevice *dev = blk_if->vdev;
+    QVirtioBlkReq req;
+    QVRingIndirectDesc *indirect;
+    uint64_t req_addr;
+    uint64_t capacity;
+    uint64_t features;
+    uint32_t free_head;
+    uint8_t status;
+    char *data;
+    QTestState *qts = global_qtest;
+
+    features = qvirtio_get_features(dev);
+    g_assert_cmphex(features & (1u << VIRTIO_RING_F_INDIRECT_DESC), !=, 0);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_EVENT_IDX) |
+                            (1u << VIRTIO_BLK_F_SCSI));
+    qvirtio_set_features(dev, features);
+
+    capacity = qvirtio_config_readq(dev, 0);
+    g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
+
+    vq = qvirtqueue_setup(dev, t_alloc, 0);
+    qvirtio_set_driver_ok(dev);
+
+    /* Write request */
+    req.type = VIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(t_alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    indirect = qvring_indirect_desc_setup(qts, dev, t_alloc, 2);
+    qvring_indirect_desc_add(dev, qts, indirect, req_addr, 528, false);
+    qvring_indirect_desc_add(dev, qts, indirect, req_addr + 528, 1, true);
+    free_head = qvirtqueue_add_indirect(qts, vq, indirect);
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    g_free(indirect);
+    guest_free(t_alloc, req_addr);
+
+    /* Read request */
+    req.type = VIRTIO_BLK_T_IN;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(t_alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    indirect = qvring_indirect_desc_setup(qts, dev, t_alloc, 2);
+    qvring_indirect_desc_add(dev, qts, indirect, req_addr, 16, false);
+    qvring_indirect_desc_add(dev, qts, indirect, req_addr + 16, 513, true);
+    free_head = qvirtqueue_add_indirect(qts, vq, indirect);
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    data = g_malloc0(512);
+    qtest_memread(qts, req_addr + 16, data, 512);
+    g_assert_cmpstr(data, ==, "TEST");
+    g_free(data);
+
+    g_free(indirect);
+    guest_free(t_alloc, req_addr);
+    qvirtqueue_cleanup(dev->bus, vq, t_alloc);
+}
+
+static void idx(void *obj, void *u_data, QGuestAllocator *t_alloc)
+{
+    QVirtQueue *vq;
+    QVhostUserBlkPCI *blk = obj;
+    QVirtioPCIDevice *pdev = &blk->pci_vdev;
+    QVirtioDevice *dev = &pdev->vdev;
+    QVirtioBlkReq req;
+    uint64_t req_addr;
+    uint64_t capacity;
+    uint64_t features;
+    uint32_t free_head;
+    uint32_t write_head;
+    uint32_t desc_idx;
+    uint8_t status;
+    char *data;
+    QOSGraphObject *blk_object = obj;
+    QPCIDevice *pci_dev = blk_object->get_driver(blk_object, "pci-device");
+    QTestState *qts = global_qtest;
+
+    if (qpci_check_buggy_msi(pci_dev)) {
+        return;
+    }
+
+    qpci_msix_enable(pdev->pdev);
+    qvirtio_pci_set_msix_configuration_vector(pdev, t_alloc, 0);
+
+    features = qvirtio_get_features(dev);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                            (1u << VIRTIO_F_NOTIFY_ON_EMPTY) |
+                            (1u << VIRTIO_BLK_F_SCSI));
+    qvirtio_set_features(dev, features);
+
+    capacity = qvirtio_config_readq(dev, 0);
+    g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
+
+    vq = qvirtqueue_setup(dev, t_alloc, 0);
+    qvirtqueue_pci_msix_setup(pdev, (QVirtQueuePCI *)vq, t_alloc, 1);
+
+    qvirtio_set_driver_ok(dev);
+
+    /*
+     * libvhost-user signals the call fd in VHOST_USER_SET_VRING_CALL, make
+     * sure to wait for the isr here so we don't race and confuse it later on.
+     */
+    qvirtio_wait_queue_isr(qts, dev, vq, QVIRTIO_BLK_TIMEOUT_US);
+
+    /* Write request */
+    req.type = VIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(t_alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, 512, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    qvirtio_wait_used_elem(qts, dev, vq, free_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+
+    /* Write request */
+    req.type = VIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 1;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(t_alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    /* Notify after processing the third request */
+    qvirtqueue_set_used_event(qts, vq, 2);
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, 512, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+    qvirtqueue_kick(qts, dev, vq, free_head);
+    write_head = free_head;
+
+    /* No notification expected */
+    status = qvirtio_wait_status_byte_no_isr(qts, dev,
+                                             vq, req_addr + 528,
+                                             QVIRTIO_BLK_TIMEOUT_US);
+    g_assert_cmpint(status, ==, 0);
+
+    guest_free(t_alloc, req_addr);
+
+    /* Read request */
+    req.type = VIRTIO_BLK_T_IN;
+    req.ioprio = 1;
+    req.sector = 1;
+    req.data = g_malloc0(512);
+
+    req_addr = virtio_blk_request(t_alloc, dev, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(qts, vq, req_addr, 16, false, true);
+    qvirtqueue_add(qts, vq, req_addr + 16, 512, true, true);
+    qvirtqueue_add(qts, vq, req_addr + 528, 1, true, false);
+
+    qvirtqueue_kick(qts, dev, vq, free_head);
+
+    /* We get just one notification for both requests */
+    qvirtio_wait_used_elem(qts, dev, vq, write_head, NULL,
+                           QVIRTIO_BLK_TIMEOUT_US);
+    g_assert(qvirtqueue_get_buf(qts, vq, &desc_idx, NULL));
+    g_assert_cmpint(desc_idx, ==, free_head);
+
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    data = g_malloc0(512);
+    qtest_memread(qts, req_addr + 16, data, 512);
+    g_assert_cmpstr(data, ==, "TEST");
+    g_free(data);
+
+    guest_free(t_alloc, req_addr);
+
+    /* End test */
+    qpci_msix_disable(pdev->pdev);
+
+    qvirtqueue_cleanup(dev->bus, vq, t_alloc);
+}
+
+static void pci_hotplug(void *obj, void *data, QGuestAllocator *t_alloc)
+{
+    QVirtioPCIDevice *dev1 = obj;
+    QVirtioPCIDevice *dev;
+    QTestState *qts = dev1->pdev->bus->qts;
+
+    /* plug secondary disk */
+    qtest_qmp_device_add(qts, "vhost-user-blk-pci", "drv1",
+                         "{'addr': %s, 'chardev': 'char2'}",
+                         stringify(PCI_SLOT_HP) ".0");
+
+    dev = virtio_pci_new(dev1->pdev->bus,
+                         &(QPCIAddress) { .devfn = QPCI_DEVFN(PCI_SLOT_HP, 0)
+                                        });
+    g_assert_nonnull(dev);
+    g_assert_cmpint(dev->vdev.device_type, ==, VIRTIO_ID_BLOCK);
+    qvirtio_pci_device_disable(dev);
+    qos_object_destroy((QOSGraphObject *)dev);
+
+    /* unplug secondary disk */
+    qpci_unplug_acpi_device_test(qts, "drv1", PCI_SLOT_HP);
+}
+
+static void multiqueue(void *obj, void *data, QGuestAllocator *t_alloc)
+{
+    QVirtioPCIDevice *pdev1 = obj;
+    QVirtioDevice *dev1 = &pdev1->vdev;
+    QVirtioPCIDevice *pdev8;
+    QVirtioDevice *dev8;
+    QTestState *qts = pdev1->pdev->bus->qts;
+    uint64_t features;
+    uint16_t num_queues;
+
+    /*
+     * The primary device has 1 queue and VIRTIO_BLK_F_MQ is not enabled. The
+     * VIRTIO specification allows VIRTIO_BLK_F_MQ to be enabled when there is
+     * only 1 virtqueue, but --device vhost-user-blk-pci doesn't do this (which
+     * is also spec-compliant).
+     */
+    features = qvirtio_get_features(dev1);
+    g_assert_cmpint(features & (1u << VIRTIO_BLK_F_MQ), ==, 0);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                            (1u << VIRTIO_F_NOTIFY_ON_EMPTY) |
+                            (1u << VIRTIO_BLK_F_SCSI));
+    qvirtio_set_features(dev1, features);
+
+    /* Hotplug a secondary device with 8 queues */
+    qtest_qmp_device_add(qts, "vhost-user-blk-pci", "drv1",
+                         "{'addr': %s, 'chardev': 'char2', 'num-queues': 8}",
+                         stringify(PCI_SLOT_HP) ".0");
+
+    pdev8 = virtio_pci_new(pdev1->pdev->bus,
+                           &(QPCIAddress) {
+                               .devfn = QPCI_DEVFN(PCI_SLOT_HP, 0)
+                           });
+    g_assert_nonnull(pdev8);
+    g_assert_cmpint(pdev8->vdev.device_type, ==, VIRTIO_ID_BLOCK);
+
+    qos_object_start_hw(&pdev8->obj);
+
+    dev8 = &pdev8->vdev;
+    features = qvirtio_get_features(dev8);
+    g_assert_cmpint(features & (1u << VIRTIO_BLK_F_MQ),
+                    ==,
+                    (1u << VIRTIO_BLK_F_MQ));
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                            (1u << VIRTIO_F_NOTIFY_ON_EMPTY) |
+                            (1u << VIRTIO_BLK_F_SCSI) |
+                            (1u << VIRTIO_BLK_F_MQ));
+    qvirtio_set_features(dev8, features);
+
+    num_queues = qvirtio_config_readw(dev8,
+            offsetof(struct virtio_blk_config, num_queues));
+    g_assert_cmpint(num_queues, ==, 8);
+
+    qvirtio_pci_device_disable(pdev8);
+    qos_object_destroy(&pdev8->obj);
+
+    /* unplug secondary disk */
+    qpci_unplug_acpi_device_test(qts, "drv1", PCI_SLOT_HP);
+}
+
+/*
+ * Check that setting the vring addr on a non-existent virtqueue does
+ * not crash.
+ */
+static void test_nonexistent_virtqueue(void *obj, void *data,
+                                       QGuestAllocator *t_alloc)
+{
+    QVhostUserBlkPCI *blk = obj;
+    QVirtioPCIDevice *pdev = &blk->pci_vdev;
+    QPCIBar bar0;
+    QPCIDevice *dev;
+
+    dev = qpci_device_find(pdev->pdev->bus, QPCI_DEVFN(4, 0));
+    g_assert(dev != NULL);
+    qpci_device_enable(dev);
+
+    bar0 = qpci_iomap(dev, 0, NULL);
+
+    qpci_io_writeb(dev, bar0, VIRTIO_PCI_QUEUE_SEL, 2);
+    qpci_io_writel(dev, bar0, VIRTIO_PCI_QUEUE_PFN, 1);
+
+    g_free(dev);
+}
+
+static const char *qtest_qemu_storage_daemon_binary(void)
+{
+    const char *qemu_storage_daemon_bin;
+
+    qemu_storage_daemon_bin = getenv("QTEST_QEMU_STORAGE_DAEMON_BINARY");
+    if (!qemu_storage_daemon_bin) {
+        fprintf(stderr, "Environment variable "
+                        "QTEST_QEMU_STORAGE_DAEMON_BINARY required\n");
+        exit(0);
+    }
+
+    return qemu_storage_daemon_bin;
+}
+
+/* g_test_queue_destroy() cleanup function for files */
+static void destroy_file(void *path)
+{
+    unlink(path);
+    g_free(path);
+    qos_invalidate_command_line();
+}
+
+static char *drive_create(void)
+{
+    int fd, ret;
+    /** vhost-user-blk won't recognize drive located in /tmp */
+    char *t_path = g_strdup("qtest.XXXXXX");
+
+    /** Create a temporary raw image */
+    fd = mkstemp(t_path);
+    g_assert_cmpint(fd, >=, 0);
+    ret = ftruncate(fd, TEST_IMAGE_SIZE);
+    g_assert_cmpint(ret, ==, 0);
+    close(fd);
+
+    g_test_queue_destroy(destroy_file, t_path);
+    return t_path;
+}
+
+static char *create_listen_socket(int *fd)
+{
+    int tmp_fd;
+    char *path;
+
+    /* No race because our pid makes the path unique */
+    path = g_strdup_printf("/tmp/qtest-%d-sock.XXXXXX", getpid());
+    tmp_fd = mkstemp(path);
+    g_assert_cmpint(tmp_fd, >=, 0);
+    close(tmp_fd);
+    unlink(path);
+
+    *fd = qtest_socket_server(path);
+    g_test_queue_destroy(destroy_file, path);
+    return path;
+}
+
+/*
+ * g_test_queue_destroy() and qtest_add_abrt_handler() cleanup function for
+ * qemu-storage-daemon.
+ */
+static void quit_storage_daemon(void *data)
+{
+    QemuStorageDaemonState *qsd = data;
+    int wstatus;
+    pid_t pid;
+
+    /*
+     * If we were invoked as a g_test_queue_destroy() cleanup function we need
+     * to remove the abrt handler to avoid being called again if the code below
+     * aborts. Also, we must not leave the abrt handler installed after
+     * cleanup.
+     */
+    qtest_remove_abrt_handler(data);
+
+    /* Before quitting storage-daemon, quit qemu to avoid dubious messages */
+    qtest_kill_qemu(global_qtest);
+
+    kill(qsd->pid, SIGTERM);
+    pid = waitpid(qsd->pid, &wstatus, 0);
+    g_assert_cmpint(pid, ==, qsd->pid);
+    if (!WIFEXITED(wstatus)) {
+        fprintf(stderr, "%s: expected qemu-storage-daemon to exit\n",
+                __func__);
+        abort();
+    }
+    if (WEXITSTATUS(wstatus) != 0) {
+        fprintf(stderr, "%s: expected qemu-storage-daemon to exit "
+                "successfully, got %d\n",
+                __func__, WEXITSTATUS(wstatus));
+        abort();
+    }
+
+    g_free(data);
+}
+
+static void start_vhost_user_blk(GString *cmd_line, int vus_instances,
+                                 int num_queues)
+{
+    const char *vhost_user_blk_bin = qtest_qemu_storage_daemon_binary();
+    int i;
+    gchar *img_path;
+    GString *storage_daemon_command = g_string_new(NULL);
+    QemuStorageDaemonState *qsd;
+
+    g_string_append_printf(storage_daemon_command,
+                           "exec %s ",
+                           vhost_user_blk_bin);
+
+    g_string_append_printf(cmd_line,
+            " -object memory-backend-memfd,id=mem,size=256M,share=on "
+            " -M memory-backend=mem -m 256M ");
+
+    for (i = 0; i < vus_instances; i++) {
+        int fd;
+        char *sock_path = create_listen_socket(&fd);
+
+        /* create image file */
+        img_path = drive_create();
+        g_string_append_printf(storage_daemon_command,
+            "--blockdev driver=file,node-name=disk%d,filename=%s "
+            "--export type=vhost-user-blk,id=disk%d,addr.type=unix,addr.path=%s,"
+            "node-name=disk%i,writable=on,num-queues=%d ",
+            i, img_path, i, sock_path, i, num_queues);
+
+        g_string_append_printf(cmd_line, "-chardev socket,id=char%d,path=%s ",
+                               i + 1, sock_path);
+    }
+
+    g_test_message("starting vhost-user backend: %s",
+                   storage_daemon_command->str);
+    pid_t pid = fork();
+    if (pid == 0) {
+        /*
+         * Close standard file descriptors so tap-driver.pl pipe detects when
+         * our parent terminates.
+         */
+        close(0);
+        close(1);
+        open("/dev/null", O_RDONLY);
+        open("/dev/null", O_WRONLY);
+
+        execlp("/bin/sh", "sh", "-c", storage_daemon_command->str, NULL);
+        exit(1);
+    }
+    g_string_free(storage_daemon_command, true);
+
+    qsd = g_new(QemuStorageDaemonState, 1);
+    qsd->pid = pid;
+
+    /* Make sure qemu-storage-daemon is stopped */
+    qtest_add_abrt_handler(quit_storage_daemon, qsd);
+    g_test_queue_destroy(quit_storage_daemon, qsd);
+}
+
+static void *vhost_user_blk_test_setup(GString *cmd_line, void *arg)
+{
+    start_vhost_user_blk(cmd_line, 1, 1);
+    return arg;
+}
+
+/*
+ * Setup for hotplug.
+ *
+ * Since vhost-user server only serves one vhost-user client one time,
+ * another exprot
+ *
+ */
+static void *vhost_user_blk_hotplug_test_setup(GString *cmd_line, void *arg)
+{
+    /* "-chardev socket,id=char2" is used for pci_hotplug*/
+    start_vhost_user_blk(cmd_line, 2, 1);
+    return arg;
+}
+
+static void *vhost_user_blk_multiqueue_test_setup(GString *cmd_line, void *arg)
+{
+    start_vhost_user_blk(cmd_line, 2, 8);
+    return arg;
+}
+
+static void register_vhost_user_blk_test(void)
+{
+    QOSGraphTestOptions opts = {
+        .before = vhost_user_blk_test_setup,
+    };
+
+    /*
+     * tests for vhost-user-blk and vhost-user-blk-pci
+     * The tests are borrowed from tests/virtio-blk-test.c. But some tests
+     * regarding block_resize don't work for vhost-user-blk.
+     * vhost-user-blk device doesn't have -drive, so tests containing
+     * block_resize are also abandoned,
+     *  - config
+     *  - resize
+     */
+    qos_add_test("basic", "vhost-user-blk", basic, &opts);
+    qos_add_test("indirect", "vhost-user-blk", indirect, &opts);
+    qos_add_test("idx", "vhost-user-blk-pci", idx, &opts);
+    qos_add_test("nxvirtq", "vhost-user-blk-pci",
+                 test_nonexistent_virtqueue, &opts);
+
+    opts.before = vhost_user_blk_hotplug_test_setup;
+    qos_add_test("hotplug", "vhost-user-blk-pci", pci_hotplug, &opts);
+
+    opts.before = vhost_user_blk_multiqueue_test_setup;
+    qos_add_test("multiqueue", "vhost-user-blk-pci", multiqueue, &opts);
+}
+
+libqos_init(register_vhost_user_blk_test);