diff mbox series

[RFC,04/10] vdpa-dev: implement the instance_init/class_init interface

Message ID 20220105005900.860-5-longpeng2@huawei.com (mailing list archive)
State New, archived
Headers show
Series add generic vDPA device support | expand

Commit Message

Denis V. Lunev" via Jan. 5, 2022, 12:58 a.m. UTC 
From: Longpeng <longpeng2@huawei.com>

Implements the .instance_init and the .class_init interface.

Signed-off-by: Longpeng <longpeng2@huawei.com>
---
 hw/virtio/vdpa-dev-pci.c     | 80 +++++++++++++++++++++++++++++++++++-
 hw/virtio/vdpa-dev.c         | 68 +++++++++++++++++++++++++++++-
 include/hw/virtio/vdpa-dev.h |  2 +
 3 files changed, 146 insertions(+), 4 deletions(-)

Comments

Stefan Hajnoczi Jan. 5, 2022, 10 a.m. UTC | #1 
On Wed, Jan 05, 2022 at 08:58:54AM +0800, Longpeng(Mike) wrote:
> From: Longpeng <longpeng2@huawei.com>
> 
> Implements the .instance_init and the .class_init interface.
> 
> Signed-off-by: Longpeng <longpeng2@huawei.com>
> ---
>  hw/virtio/vdpa-dev-pci.c     | 80 +++++++++++++++++++++++++++++++++++-
>  hw/virtio/vdpa-dev.c         | 68 +++++++++++++++++++++++++++++-
>  include/hw/virtio/vdpa-dev.h |  2 +
>  3 files changed, 146 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/virtio/vdpa-dev-pci.c b/hw/virtio/vdpa-dev-pci.c
> index a5a7b528a9..0af54a26d4 100644
> --- a/hw/virtio/vdpa-dev-pci.c
> +++ b/hw/virtio/vdpa-dev-pci.c
> @@ -23,14 +23,90 @@ struct VhostVdpaDevicePCI {
>      VhostVdpaDevice vdev;
>  };
>  
> +static uint32_t
> +vdpa_dev_pci_get_info(const char *name, uint64_t cmd, Error **errp)

vdpa_dev_pci_get_u32() might be a clearer name.

> +{
> +    int device_fd;
> +    uint32_t val;
> +    int ret;
> +
> +    device_fd = qemu_open(name, O_RDWR, errp);
> +    if (device_fd == -1) {
> +        return (uint32_t)-1;
> +    }
> +
> +    ret = ioctl(device_fd, cmd, &val);
> +    if (ret < 0) {
> +        error_setg(errp, "vhost-vdpa-device-pci: cmd 0x%lx failed: %s",
> +                   cmd, strerror(errno));
> +        goto out;
> +    }
> +
> +out:
> +    close(device_fd);

Race conditions are possible if the device node is replaced between
calls. Why not open the file once and reuse the fd across ioctl calls?

Both VhostVdpaDevicePCI and VhostVdpaDevice need the fd but
VhostVdpaDevicePCI needs it first. I suggest passing ownership of the fd
to the VhostVdpaDevice. One way of doing this is using QOM properties so
that VhostVdpaDevice can use the given fd instead of reopening the file.
(If fd is -1 then VhostVdpaDevice can try to open the file. That is
necessary when VhostVdpaDevice is used directly with virtio-mmio because
there is no proxy object.)
Stefano Garzarella Jan. 5, 2022, 11:28 a.m. UTC | #2 
On Wed, Jan 05, 2022 at 08:58:54AM +0800, Longpeng(Mike) wrote:
>From: Longpeng <longpeng2@huawei.com>
>
>Implements the .instance_init and the .class_init interface.
>
>Signed-off-by: Longpeng <longpeng2@huawei.com>
>---
> hw/virtio/vdpa-dev-pci.c     | 80 +++++++++++++++++++++++++++++++++++-
> hw/virtio/vdpa-dev.c         | 68 +++++++++++++++++++++++++++++-
> include/hw/virtio/vdpa-dev.h |  2 +
> 3 files changed, 146 insertions(+), 4 deletions(-)
>
>diff --git a/hw/virtio/vdpa-dev-pci.c b/hw/virtio/vdpa-dev-pci.c
>index a5a7b528a9..0af54a26d4 100644
>--- a/hw/virtio/vdpa-dev-pci.c
>+++ b/hw/virtio/vdpa-dev-pci.c
>@@ -23,14 +23,90 @@ struct VhostVdpaDevicePCI {
>     VhostVdpaDevice vdev;
> };
>
>+static uint32_t
>+vdpa_dev_pci_get_info(const char *name, uint64_t cmd, Error **errp)
>+{
>+    int device_fd;
>+    uint32_t val;
>+    int ret;
>+
>+    device_fd = qemu_open(name, O_RDWR, errp);
>+    if (device_fd == -1) {
>+        return (uint32_t)-1;
>+    }
>+
>+    ret = ioctl(device_fd, cmd, &val);
>+    if (ret < 0) {
>+        error_setg(errp, "vhost-vdpa-device-pci: cmd 0x%lx failed: %s",
>+                   cmd, strerror(errno));
>+        goto out;
>+    }
>+
>+out:
>+    close(device_fd);
>+    return val;
>+}
>+
>+static inline uint32_t
>+vdpa_dev_pci_get_devid(VhostVdpaDevicePCI *dev, Error **errp)
>+{
>+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
>+                                 VHOST_VDPA_GET_DEVICE_ID, errp);
>+}
>+
>+static inline uint32_t
>+vdpa_dev_pci_get_vectors_num(VhostVdpaDevicePCI *dev, Error **errp)
>+{
>+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
>+                                 VHOST_VDPA_GET_VECTORS_NUM, errp);
>+}
>+
> static void vhost_vdpa_device_pci_instance_init(Object *obj)
> {
>-    return;
>+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(obj);
>+
>+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
>+                                TYPE_VHOST_VDPA_DEVICE);
>+    object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
>+                              "bootindex");
>+}
>+
>+static Property vhost_vdpa_device_pci_properties[] = {
>+    DEFINE_PROP_END_OF_LIST(),
>+};
>+
>+static void
>+vhost_vdpa_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
>+{
>+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(vpci_dev);
>+    DeviceState *vdev = DEVICE(&dev->vdev);
>+    uint32_t devid;
>+    uint32_t vectors;
>+
>+    devid = vdpa_dev_pci_get_devid(dev, errp);
>+    if (*errp) {
>+        return;
>+    }
>+
>+    vectors = vdpa_dev_pci_get_vectors_num(dev, errp);
>+    if (*errp) {
>+        return;
>+    }
>+
>+    vpci_dev->class_code = virtio_pci_get_class_id(devid);
>+    vpci_dev->pdev_id = virtio_pci_get_pci_devid(devid);
>+    vpci_dev->nvectors = vectors;
>+    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
> }
>
> static void vhost_vdpa_device_pci_class_init(ObjectClass *klass, void *data)
> {
>-    return;
>+    DeviceClass *dc = DEVICE_CLASS(klass);
>+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
>+
>+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
>+    device_class_set_props(dc, vhost_vdpa_device_pci_properties);
>+    k->realize = vhost_vdpa_device_pci_realize;
> }
>
> static const VirtioPCIDeviceTypeInfo vhost_vdpa_device_pci_info = {
>diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
>index f4f92b90b0..790117fb3b 100644
>--- a/hw/virtio/vdpa-dev.c
>+++ b/hw/virtio/vdpa-dev.c
>@@ -15,16 +15,80 @@
> #include "sysemu/sysemu.h"
> #include "sysemu/runstate.h"
>
>-static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
>+static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
> {
>     return;
> }
>
>-static void vhost_vdpa_device_instance_init(Object *obj)
>+static void vhost_vdpa_device_unrealize(DeviceState *dev)
>+{
>+    return;
>+}
>+
>+static void
>+vhost_vdpa_device_get_config(VirtIODevice *vdev, uint8_t *config)
>+{
>+    return;
>+}
>+
>+static void
>+vhost_vdpa_device_set_config(VirtIODevice *vdev, const uint8_t *config)
> {
>     return;
> }
>
>+static uint64_t vhost_vdpa_device_get_features(VirtIODevice *vdev,
>+                                               uint64_t features,
>+                                               Error **errp)
>+{
>+    return (uint64_t)-1;
>+}
>+
>+static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
>+{
>+    return;
>+}
>+
>+static Property vhost_vdpa_device_properties[] = {
>+    DEFINE_PROP_STRING("vdpa-dev", VhostVdpaDevice, vdpa_dev),
>+    DEFINE_PROP_END_OF_LIST(),
>+};
>+
>+static const VMStateDescription vmstate_vhost_vdpa_device = {
>+    .name = "vhost-vdpa-device",
>+    .minimum_version_id = 1,
>+    .version_id = 1,
>+    .fields = (VMStateField[]) {
>+        VMSTATE_VIRTIO_DEVICE,
>+        VMSTATE_END_OF_LIST()
>+    },
>+};
>+
>+static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
>+{
>+    DeviceClass *dc = DEVICE_CLASS(klass);
>+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
>+
>+    device_class_set_props(dc, vhost_vdpa_device_properties);
>+    dc->desc = "VDPA-based generic PCI device assignment";

IIUC, this should be the description of the generic vhost vDPA device, 
not the PCI implementation, right?

Thanks,
Stefano
Denis V. Lunev" via Jan. 6, 2022, 2:39 a.m. UTC | #3 
> -----Original Message-----
> From: Stefan Hajnoczi [mailto:stefanha@redhat.com]
> Sent: Wednesday, January 5, 2022 6:01 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@huawei.com>
> Cc: mst@redhat.com; jasowang@redhat.com; sgarzare@redhat.com;
> cohuck@redhat.com; pbonzini@redhat.com; Gonglei (Arei)
> <arei.gonglei@huawei.com>; Yechuan <yechuan@huawei.com>; Huangzhichao
> <huangzhichao@huawei.com>; qemu-devel@nongnu.org
> Subject: Re: [RFC 04/10] vdpa-dev: implement the instance_init/class_init
> interface
> 
> On Wed, Jan 05, 2022 at 08:58:54AM +0800, Longpeng(Mike) wrote:
> > From: Longpeng <longpeng2@huawei.com>
> >
> > Implements the .instance_init and the .class_init interface.
> >
> > Signed-off-by: Longpeng <longpeng2@huawei.com>
> > ---
> >  hw/virtio/vdpa-dev-pci.c     | 80 +++++++++++++++++++++++++++++++++++-
> >  hw/virtio/vdpa-dev.c         | 68 +++++++++++++++++++++++++++++-
> >  include/hw/virtio/vdpa-dev.h |  2 +
> >  3 files changed, 146 insertions(+), 4 deletions(-)
> >
> > diff --git a/hw/virtio/vdpa-dev-pci.c b/hw/virtio/vdpa-dev-pci.c
> > index a5a7b528a9..0af54a26d4 100644
> > --- a/hw/virtio/vdpa-dev-pci.c
> > +++ b/hw/virtio/vdpa-dev-pci.c
> > @@ -23,14 +23,90 @@ struct VhostVdpaDevicePCI {
> >      VhostVdpaDevice vdev;
> >  };
> >
> > +static uint32_t
> > +vdpa_dev_pci_get_info(const char *name, uint64_t cmd, Error **errp)
> 
> vdpa_dev_pci_get_u32() might be a clearer name.
> 

OK.

> > +{
> > +    int device_fd;
> > +    uint32_t val;
> > +    int ret;
> > +
> > +    device_fd = qemu_open(name, O_RDWR, errp);
> > +    if (device_fd == -1) {
> > +        return (uint32_t)-1;
> > +    }
> > +
> > +    ret = ioctl(device_fd, cmd, &val);
> > +    if (ret < 0) {
> > +        error_setg(errp, "vhost-vdpa-device-pci: cmd 0x%lx failed: %s",
> > +                   cmd, strerror(errno));
> > +        goto out;
> > +    }
> > +
> > +out:
> > +    close(device_fd);
> 
> Race conditions are possible if the device node is replaced between
> calls. Why not open the file once and reuse the fd across ioctl calls?
> 
> Both VhostVdpaDevicePCI and VhostVdpaDevice need the fd but
> VhostVdpaDevicePCI needs it first. I suggest passing ownership of the fd
> to the VhostVdpaDevice. One way of doing this is using QOM properties so
> that VhostVdpaDevice can use the given fd instead of reopening the file.
> (If fd is -1 then VhostVdpaDevice can try to open the file. That is
> necessary when VhostVdpaDevice is used directly with virtio-mmio because
> there is no proxy object.)

Adding the fd field into the VhostVdpaDevice looks fine! I'll do it in V2.
Thanks.
Denis V. Lunev" via Jan. 6, 2022, 2:40 a.m. UTC | #4 
> -----Original Message-----
> From: Stefano Garzarella [mailto:sgarzare@redhat.com]
> Sent: Wednesday, January 5, 2022 7:29 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@huawei.com>
> Cc: stefanha@redhat.com; mst@redhat.com; jasowang@redhat.com;
> cohuck@redhat.com; pbonzini@redhat.com; Gonglei (Arei)
> <arei.gonglei@huawei.com>; Yechuan <yechuan@huawei.com>; Huangzhichao
> <huangzhichao@huawei.com>; qemu-devel@nongnu.org
> Subject: Re: [RFC 04/10] vdpa-dev: implement the instance_init/class_init
> interface
> 
> On Wed, Jan 05, 2022 at 08:58:54AM +0800, Longpeng(Mike) wrote:
> >From: Longpeng <longpeng2@huawei.com>
> >
> >Implements the .instance_init and the .class_init interface.
> >
> >Signed-off-by: Longpeng <longpeng2@huawei.com>
> >---
> > hw/virtio/vdpa-dev-pci.c     | 80 +++++++++++++++++++++++++++++++++++-
> > hw/virtio/vdpa-dev.c         | 68 +++++++++++++++++++++++++++++-
> > include/hw/virtio/vdpa-dev.h |  2 +
> > 3 files changed, 146 insertions(+), 4 deletions(-)
> >
> >diff --git a/hw/virtio/vdpa-dev-pci.c b/hw/virtio/vdpa-dev-pci.c
> >index a5a7b528a9..0af54a26d4 100644
> >--- a/hw/virtio/vdpa-dev-pci.c
> >+++ b/hw/virtio/vdpa-dev-pci.c
> >@@ -23,14 +23,90 @@ struct VhostVdpaDevicePCI {
> >     VhostVdpaDevice vdev;
> > };
> >
> >+static uint32_t
> >+vdpa_dev_pci_get_info(const char *name, uint64_t cmd, Error **errp)
> >+{
> >+    int device_fd;
> >+    uint32_t val;
> >+    int ret;
> >+
> >+    device_fd = qemu_open(name, O_RDWR, errp);
> >+    if (device_fd == -1) {
> >+        return (uint32_t)-1;
> >+    }
> >+
> >+    ret = ioctl(device_fd, cmd, &val);
> >+    if (ret < 0) {
> >+        error_setg(errp, "vhost-vdpa-device-pci: cmd 0x%lx failed: %s",
> >+                   cmd, strerror(errno));
> >+        goto out;
> >+    }
> >+
> >+out:
> >+    close(device_fd);
> >+    return val;
> >+}
> >+
> >+static inline uint32_t
> >+vdpa_dev_pci_get_devid(VhostVdpaDevicePCI *dev, Error **errp)
> >+{
> >+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
> >+                                 VHOST_VDPA_GET_DEVICE_ID, errp);
> >+}
> >+
> >+static inline uint32_t
> >+vdpa_dev_pci_get_vectors_num(VhostVdpaDevicePCI *dev, Error **errp)
> >+{
> >+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
> >+                                 VHOST_VDPA_GET_VECTORS_NUM, errp);
> >+}
> >+
> > static void vhost_vdpa_device_pci_instance_init(Object *obj)
> > {
> >-    return;
> >+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(obj);
> >+
> >+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
> >+                                TYPE_VHOST_VDPA_DEVICE);
> >+    object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
> >+                              "bootindex");
> >+}
> >+
> >+static Property vhost_vdpa_device_pci_properties[] = {
> >+    DEFINE_PROP_END_OF_LIST(),
> >+};
> >+
> >+static void
> >+vhost_vdpa_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
> >+{
> >+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(vpci_dev);
> >+    DeviceState *vdev = DEVICE(&dev->vdev);
> >+    uint32_t devid;
> >+    uint32_t vectors;
> >+
> >+    devid = vdpa_dev_pci_get_devid(dev, errp);
> >+    if (*errp) {
> >+        return;
> >+    }
> >+
> >+    vectors = vdpa_dev_pci_get_vectors_num(dev, errp);
> >+    if (*errp) {
> >+        return;
> >+    }
> >+
> >+    vpci_dev->class_code = virtio_pci_get_class_id(devid);
> >+    vpci_dev->pdev_id = virtio_pci_get_pci_devid(devid);
> >+    vpci_dev->nvectors = vectors;
> >+    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
> > }
> >
> > static void vhost_vdpa_device_pci_class_init(ObjectClass *klass, void *data)
> > {
> >-    return;
> >+    DeviceClass *dc = DEVICE_CLASS(klass);
> >+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
> >+
> >+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> >+    device_class_set_props(dc, vhost_vdpa_device_pci_properties);
> >+    k->realize = vhost_vdpa_device_pci_realize;
> > }
> >
> > static const VirtioPCIDeviceTypeInfo vhost_vdpa_device_pci_info = {
> >diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
> >index f4f92b90b0..790117fb3b 100644
> >--- a/hw/virtio/vdpa-dev.c
> >+++ b/hw/virtio/vdpa-dev.c
> >@@ -15,16 +15,80 @@
> > #include "sysemu/sysemu.h"
> > #include "sysemu/runstate.h"
> >
> >-static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
> >+static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
> > {
> >     return;
> > }
> >
> >-static void vhost_vdpa_device_instance_init(Object *obj)
> >+static void vhost_vdpa_device_unrealize(DeviceState *dev)
> >+{
> >+    return;
> >+}
> >+
> >+static void
> >+vhost_vdpa_device_get_config(VirtIODevice *vdev, uint8_t *config)
> >+{
> >+    return;
> >+}
> >+
> >+static void
> >+vhost_vdpa_device_set_config(VirtIODevice *vdev, const uint8_t *config)
> > {
> >     return;
> > }
> >
> >+static uint64_t vhost_vdpa_device_get_features(VirtIODevice *vdev,
> >+                                               uint64_t features,
> >+                                               Error **errp)
> >+{
> >+    return (uint64_t)-1;
> >+}
> >+
> >+static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
> >+{
> >+    return;
> >+}
> >+
> >+static Property vhost_vdpa_device_properties[] = {
> >+    DEFINE_PROP_STRING("vdpa-dev", VhostVdpaDevice, vdpa_dev),
> >+    DEFINE_PROP_END_OF_LIST(),
> >+};
> >+
> >+static const VMStateDescription vmstate_vhost_vdpa_device = {
> >+    .name = "vhost-vdpa-device",
> >+    .minimum_version_id = 1,
> >+    .version_id = 1,
> >+    .fields = (VMStateField[]) {
> >+        VMSTATE_VIRTIO_DEVICE,
> >+        VMSTATE_END_OF_LIST()
> >+    },
> >+};
> >+
> >+static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
> >+{
> >+    DeviceClass *dc = DEVICE_CLASS(klass);
> >+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
> >+
> >+    device_class_set_props(dc, vhost_vdpa_device_properties);
> >+    dc->desc = "VDPA-based generic PCI device assignment";
> 
> IIUC, this should be the description of the generic vhost vDPA device,
> not the PCI implementation, right?
> 

Good catch, thanks.

> Thanks,
> Stefano
diff mbox series

Patch

diff --git a/hw/virtio/vdpa-dev-pci.c b/hw/virtio/vdpa-dev-pci.c
index a5a7b528a9..0af54a26d4 100644
--- a/hw/virtio/vdpa-dev-pci.c
+++ b/hw/virtio/vdpa-dev-pci.c
@@ -23,14 +23,90 @@  struct VhostVdpaDevicePCI {
     VhostVdpaDevice vdev;
 };
 
+static uint32_t
+vdpa_dev_pci_get_info(const char *name, uint64_t cmd, Error **errp)
+{
+    int device_fd;
+    uint32_t val;
+    int ret;
+
+    device_fd = qemu_open(name, O_RDWR, errp);
+    if (device_fd == -1) {
+        return (uint32_t)-1;
+    }
+
+    ret = ioctl(device_fd, cmd, &val);
+    if (ret < 0) {
+        error_setg(errp, "vhost-vdpa-device-pci: cmd 0x%lx failed: %s",
+                   cmd, strerror(errno));
+        goto out;
+    }
+
+out:
+    close(device_fd);
+    return val;
+}
+
+static inline uint32_t
+vdpa_dev_pci_get_devid(VhostVdpaDevicePCI *dev, Error **errp)
+{
+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
+                                 VHOST_VDPA_GET_DEVICE_ID, errp);
+}
+
+static inline uint32_t
+vdpa_dev_pci_get_vectors_num(VhostVdpaDevicePCI *dev, Error **errp)
+{
+    return vdpa_dev_pci_get_info(dev->vdev.vdpa_dev,
+                                 VHOST_VDPA_GET_VECTORS_NUM, errp);
+}
+
 static void vhost_vdpa_device_pci_instance_init(Object *obj)
 {
-    return;
+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(obj);
+
+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
+                                TYPE_VHOST_VDPA_DEVICE);
+    object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
+                              "bootindex");
+}
+
+static Property vhost_vdpa_device_pci_properties[] = {
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void
+vhost_vdpa_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
+{
+    VhostVdpaDevicePCI *dev = VHOST_VDPA_DEVICE_PCI(vpci_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
+    uint32_t devid;
+    uint32_t vectors;
+
+    devid = vdpa_dev_pci_get_devid(dev, errp);
+    if (*errp) {
+        return;
+    }
+
+    vectors = vdpa_dev_pci_get_vectors_num(dev, errp);
+    if (*errp) {
+        return;
+    }
+
+    vpci_dev->class_code = virtio_pci_get_class_id(devid);
+    vpci_dev->pdev_id = virtio_pci_get_pci_devid(devid);
+    vpci_dev->nvectors = vectors;
+    qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
 }
 
 static void vhost_vdpa_device_pci_class_init(ObjectClass *klass, void *data)
 {
-    return;
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
+
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    device_class_set_props(dc, vhost_vdpa_device_pci_properties);
+    k->realize = vhost_vdpa_device_pci_realize;
 }
 
 static const VirtioPCIDeviceTypeInfo vhost_vdpa_device_pci_info = {
diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index f4f92b90b0..790117fb3b 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -15,16 +15,80 @@ 
 #include "sysemu/sysemu.h"
 #include "sysemu/runstate.h"
 
-static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
+static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
 {
     return;
 }
 
-static void vhost_vdpa_device_instance_init(Object *obj)
+static void vhost_vdpa_device_unrealize(DeviceState *dev)
+{
+    return;
+}
+
+static void
+vhost_vdpa_device_get_config(VirtIODevice *vdev, uint8_t *config)
+{
+    return;
+}
+
+static void
+vhost_vdpa_device_set_config(VirtIODevice *vdev, const uint8_t *config)
 {
     return;
 }
 
+static uint64_t vhost_vdpa_device_get_features(VirtIODevice *vdev,
+                                               uint64_t features,
+                                               Error **errp)
+{
+    return (uint64_t)-1;
+}
+
+static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
+{
+    return;
+}
+
+static Property vhost_vdpa_device_properties[] = {
+    DEFINE_PROP_STRING("vdpa-dev", VhostVdpaDevice, vdpa_dev),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_vhost_vdpa_device = {
+    .name = "vhost-vdpa-device",
+    .minimum_version_id = 1,
+    .version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_VIRTIO_DEVICE,
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+
+    device_class_set_props(dc, vhost_vdpa_device_properties);
+    dc->desc = "VDPA-based generic PCI device assignment";
+    dc->vmsd = &vmstate_vhost_vdpa_device;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    vdc->realize = vhost_vdpa_device_realize;
+    vdc->unrealize = vhost_vdpa_device_unrealize;
+    vdc->get_config = vhost_vdpa_device_get_config;
+    vdc->set_config = vhost_vdpa_device_set_config;
+    vdc->get_features = vhost_vdpa_device_get_features;
+    vdc->set_status = vhost_vdpa_device_set_status;
+}
+
+static void vhost_vdpa_device_instance_init(Object *obj)
+{
+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(obj);
+
+    device_add_bootindex_property(obj, &s->bootindex, "bootindex",
+                                  NULL, DEVICE(obj));
+}
+
 static const TypeInfo vhost_vdpa_device_info = {
     .name = TYPE_VHOST_VDPA_DEVICE,
     .parent = TYPE_VIRTIO_DEVICE,
diff --git a/include/hw/virtio/vdpa-dev.h b/include/hw/virtio/vdpa-dev.h
index dd94bd74a2..7a0e6bdcf8 100644
--- a/include/hw/virtio/vdpa-dev.h
+++ b/include/hw/virtio/vdpa-dev.h
@@ -11,6 +11,8 @@  OBJECT_DECLARE_SIMPLE_TYPE(VhostVdpaDevice, VHOST_VDPA_DEVICE)
 
 struct VhostVdpaDevice {
     VirtIODevice parent_obj;
+    char *vdpa_dev;
+    int32_t bootindex;
 };
 
 #endif