[v1] vdpa-dev: add get_vhost() callback for vhost-vdpa device

[PATCH] vdpa-dev: add get_vhost() callback for vhost-vdpa device

Posted by Li Zhaoxin via 5 days, 1 hour ago

Commit c255488d67 "virtio: add vhost support for virtio devices"
added the get_vhost() function, but it did not include vhost-vdpa devices.
Now we add it.

Co-developed-by: Miao Kezhan <miaokezhan@baidu.com>
Signed-off-by: Miao Kezhan <miaokezhan@baidu.com>
Signed-off-by: Li Zhaoxin <lizhaoxin04@baidu.com>
---
 hw/virtio/vdpa-dev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index d1da40afc8..4a7b970976 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -338,6 +338,12 @@ static int vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
     return 0;
 }
 
+static struct vhost_dev *vhost_vdpa_device_get_vhost(VirtIODevice *vdev)
+{
+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
+    return &s->dev;
+}
+
 static const Property vhost_vdpa_device_properties[] = {
     DEFINE_PROP_STRING("vhostdev", VhostVdpaDevice, vhostdev),
     DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
@@ -369,6 +375,7 @@ static void vhost_vdpa_device_class_init(ObjectClass *klass, const void *data)
     vdc->set_config = vhost_vdpa_device_set_config;
     vdc->get_features = vhost_vdpa_device_get_features;
     vdc->set_status = vhost_vdpa_device_set_status;
+    vdc->get_vhost = vhost_vdpa_device_get_vhost;
 }
 
 static void vhost_vdpa_device_instance_init(Object *obj)
-- 
2.34.1

Re: [PATCH] vdpa-dev: add get_vhost() callback for vhost-vdpa device

Posted by Jonah Palmer 4 days ago


On 9/23/25 9:51 AM, Li Zhaoxin wrote:
> Commit c255488d67 "virtio: add vhost support for virtio devices"
> added the get_vhost() function, but it did not include vhost-vdpa devices.
> Now we add it.
> 

Looks good to me!

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>

> Co-developed-by: Miao Kezhan <miaokezhan@baidu.com>
> Signed-off-by: Miao Kezhan <miaokezhan@baidu.com>
> Signed-off-by: Li Zhaoxin <lizhaoxin04@baidu.com>
> ---
>   hw/virtio/vdpa-dev.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
> index d1da40afc8..4a7b970976 100644
> --- a/hw/virtio/vdpa-dev.c
> +++ b/hw/virtio/vdpa-dev.c
> @@ -338,6 +338,12 @@ static int vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
>       return 0;
>   }
>   
> +static struct vhost_dev *vhost_vdpa_device_get_vhost(VirtIODevice *vdev)
> +{
> +    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
> +    return &s->dev;
> +}
> +
>   static const Property vhost_vdpa_device_properties[] = {
>       DEFINE_PROP_STRING("vhostdev", VhostVdpaDevice, vhostdev),
>       DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
> @@ -369,6 +375,7 @@ static void vhost_vdpa_device_class_init(ObjectClass *klass, const void *data)
>       vdc->set_config = vhost_vdpa_device_set_config;
>       vdc->get_features = vhost_vdpa_device_get_features;
>       vdc->set_status = vhost_vdpa_device_set_status;
> +    vdc->get_vhost = vhost_vdpa_device_get_vhost;
>   }
>   
>   static void vhost_vdpa_device_instance_init(Object *obj)

Re: [PATCH] vdpa-dev: add get_vhost() callback for vhost-vdpa device

Posted by Stefano Garzarella 4 days, 7 hours ago

On Tue, Sep 23, 2025 at 09:51:10PM +0800, Li Zhaoxin wrote:
>Commit c255488d67 "virtio: add vhost support for virtio devices"
>added the get_vhost() function, but it did not include vhost-vdpa devices.
>Now we add it.

Again, could you please explain what problem you had and how this patch 
solves it?

This information must always be included in a commit message, so please 
pay attention to this.

Thanks,
Stefano

>
>Co-developed-by: Miao Kezhan <miaokezhan@baidu.com>
>Signed-off-by: Miao Kezhan <miaokezhan@baidu.com>
>Signed-off-by: Li Zhaoxin <lizhaoxin04@baidu.com>
>---
> hw/virtio/vdpa-dev.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
>diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
>index d1da40afc8..4a7b970976 100644
>--- a/hw/virtio/vdpa-dev.c
>+++ b/hw/virtio/vdpa-dev.c
>@@ -338,6 +338,12 @@ static int vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
>     return 0;
> }
>
>+static struct vhost_dev *vhost_vdpa_device_get_vhost(VirtIODevice *vdev)
>+{
>+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
>+    return &s->dev;
>+}
>+
> static const Property vhost_vdpa_device_properties[] = {
>     DEFINE_PROP_STRING("vhostdev", VhostVdpaDevice, vhostdev),
>     DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
>@@ -369,6 +375,7 @@ static void vhost_vdpa_device_class_init(ObjectClass *klass, const void *data)
>     vdc->set_config = vhost_vdpa_device_set_config;
>     vdc->get_features = vhost_vdpa_device_get_features;
>     vdc->set_status = vhost_vdpa_device_set_status;
>+    vdc->get_vhost = vhost_vdpa_device_get_vhost;
> }
>
> static void vhost_vdpa_device_instance_init(Object *obj)
>-- 
>2.34.1
>

Re: [PATCH] vdpa-dev: add get_vhost() callback for vhost-vdpa device

Posted by Li Zhaoxin via 2 days, 10 hours ago

On Wed, 24 Sep 2025 04:08:24 -0700, Stefano Garzarella wrote:
>On Tue, Sep 23, 2025 at 09:51:10PM +0800, Li Zhaoxin wrote:
>>Commit c255488d67 "virtio: add vhost support for virtio devices"
>>added the get_vhost() function, but it did not include vhost-vdpa devices.
>>Now we add it.
>
>Again, could you please explain what problem you had and how this patch 
>solves it?
>
>This information must always be included in a commit message, so please 
>pay attention to this.
>
>Thanks,
>Stefano
>

OK, I've got it.
When I use the vdpa device and query the status of the vdpa device with
the x-query-virtio-status qmp command, since vdpa does not implement vhost_get,
it will cause qemu to crash. 

Therefore, in order to obtain the status of the virtio device under vhost-vdpa,
we need to add a vhost_get implement for the vdpa device.

Later, I will send Patch v2 that includes the complete commit information.

Thanks,
Li Zhaoxin

>>
>>Co-developed-by: Miao Kezhan <miaokezhan@baidu.com>
>>Signed-off-by: Miao Kezhan <miaokezhan@baidu.com>
>>Signed-off-by: Li Zhaoxin <lizhaoxin04@baidu.com>
>>---
>> hw/virtio/vdpa-dev.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>>diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
>>index d1da40afc8..4a7b970976 100644
>>--- a/hw/virtio/vdpa-dev.c
>>+++ b/hw/virtio/vdpa-dev.c
>>@@ -338,6 +338,12 @@ static int vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
>>     return 0;
>> }
>>
>>+static struct vhost_dev *vhost_vdpa_device_get_vhost(VirtIODevice *vdev)
>>+{
>>+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
>>+    return &s->dev;
>>+}
>>+
>> static const Property vhost_vdpa_device_properties[] = {
>>     DEFINE_PROP_STRING("vhostdev", VhostVdpaDevice, vhostdev),
>>     DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
>>@@ -369,6 +375,7 @@ static void vhost_vdpa_device_class_init(ObjectClass *klass, const void *data)
>>     vdc->set_config = vhost_vdpa_device_set_config;
>>     vdc->get_features = vhost_vdpa_device_get_features;
>>     vdc->set_status = vhost_vdpa_device_set_status;
>>+    vdc->get_vhost = vhost_vdpa_device_get_vhost;
>> }
>>
>> static void vhost_vdpa_device_instance_init(Object *obj)
>>-- 
>>2.34.1
>>