How to hot plugin a new vhost-user-blk-pci device to running VM?

[梁朝军]

Hi Guys:

Who can help me ? What does this issue mean?  When I attach a network I hit this issue.

libvirt: QEMU Driver error : internal error: unable to execute QEMU command 'netdev_add': Invalid parameter type for 'vhost', expected: boolean

Thanks!

> 在 2021年5月24日，下午7:08，Daniel P. Berrangé <berrange at redhat.com> 写道：
> 
> On Mon, May 24, 2021 at 01:04:44PM +0200, Michal Prívozník wrote:
>> On 5/21/21 5:28 PM, 梁朝军 wrote:
>>> Thanks all of you for your help.
>>> One more question regarding  vhost-user-blk-pci type device,  how to identify a vhost-blk disk in QEUM VM ?  for example, disk name looks like vda,vdb,..., but that some application in VM want to detect  that a certain entry is really the device it is waiting for. Specific for windows , they always show as disk 0, 1, 2….etc
>>> Is there any way to identify those disk with each other in VM?
>> 
>> In general no. Usually disks will be enumerated sequentially - thus the
>> first disk on a sata/scsi/usb/.. bus will be sda, the second will be
>> sdb, and so on. But libvirt can't guarantee it - the same way you can't
>> guarantee how a disk is going to be called with real HW.
> 
> You can set the 'serial' property in the disk in libvirt, and then match
> that in the guest. For Linux guests that's used in /dev/disk/by-id
> symlinks.
> 
> Regards,
> Daniel
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