Thanks Peter for your quickly response. Is there any workaround to do that？As you know we must take care the risk of using latest version in product environment. Thanks a lot! > 在 2021年5月13日，22:25，Peter Krempa <pkrempa@xxxxxxxxxx> 写道： > > On Thu, May 13, 2021 at 15:25:23 +0800, 梁朝军 wrote: >> Hi Guy, >> >> Does anyone clear how to hot plugin a new vhost-user-blk-pci device to a >> running VM? >> >> Before staring vm , I pass the disk through QEMU command line like below. >> >> <qemu:commandline> >> <qemu:arg value='-object'/> >> <qemu:arg >> value='memory-backend-file,id=mem0,size=4G,mem-path=/dev/hugepages,share=on'/> >> <qemu:arg value='-numa'/> >> <qemu:arg value='node,memdev=mem0'/> >> <qemu:arg value='-chardev'/> >> <qemu:arg >> value='socket,id=spdk_vhost_blk721ea46a-b306-11eb-a280-525400a98761,path=/var/tmp/vhost.721ea46a-b306-11eb-a280-525400a98761,reconnect=1'/> >> <qemu:arg value='-device'/> >> <qemu:arg >> value='vhost-user-blk-pci,chardev=spdk_vhost_blk721ea46a-b306-11eb-a280-525400a98761,bootindex=1,num-queues=4'/> >> <qemu:arg value='-chardev'/> >> <qemu:arg >> value='socket,id=spdk_vhost_blk2f699c58-d222-4629-9fdc-400c3aadc55e,path=/var/tmp/vhost.2f699c58-d222-4629-9fdc-400c3aadc55e,reconnect=1'/> >> <qemu:arg value='-device'/> >> <qemu:arg >> value='vhost-user-blk-pci,chardev=spdk_vhost_blk2f699c58-d222-4629-9fdc-400c3aadc55e,num-queues=4'/> >> </qemu:commandline> >> >> But I don**t know how to live add a vhost-user-blk-pci device on running >> VM even with calling attachDevice API now. > > You need to use the proper and supported way to use vhost-user-blk: > > <disk type='vhostuser' device='disk'> > <driver name='qemu' type='raw'/> > <source type='unix' path='/tmp/vhost-blk.sock'> > <reconnect enabled='yes' timeout='10'/> > </source> > <target dev='vdf' bus='virtio'/> > </disk> > > That works also with attachDevice. > > >> OS: redhat 7.4 Libvirt version: 3.4 > > This is obviously way too old for it. You'll need at least libvirt-7.1 > for that. >
