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

[Liang Chaojun]

Thanks Michal and Peter for your response. I‘ m running it on qemu 5.1 build by myself. BTW, follow Peter’s suggestion, where I can get the latest rpms if I want to upgrade to Libvirt 7.1? As I know it seems need more than twenty related rpms not include dependency.

> 在 2021年5月14日，21:15，Michal Prívozník <mprivozn at redhat.com> 写道：
> 
> On 5/14/21 8:33 AM, Liang Chaojun wrote:
>> 
>> 
>> Thanks，I have tried qemu monitor as below. I used chardev_add to add a chardev and used device_add it to running vm. But i often hit a issue and cause the vm crash. qemu-system-x86_64: ../hw/virtio/vhost.c:1566: vhost_dev_get_config: Assertion `hdev->vhost_ops' failed.
>> 
>> virsh qemu-monitor-command spdk1 --hmp --cmd "chardev-add socket,id=spdk_vhost_blk0,path=/var/tmp/vhost.0,reconnect=1"  virsh qemu-monitor-command spdk1 --hmp --cmd "device_add vhost-user-blk-pci,chardev=spdk_vhost_blk0,num-queues=4"
> 
> Smells like problem described here:
> 
> https://gitlab.com/qemu-project/qemu/-/commit/bc79c87bcde6587a37347f81332fbb0cd6b14b85
> 
> But that's pretty fresh commit (part of qemu 6.0.0 release). And also
> the commit it references is not that old (qemu 5.1.0 release). What
> version of qemu are 
>