Hello, I figured out I should have executed chardev-remove to disconnect unix socket connection. It actually works on qemu 6.2.0. but for qemu 4.2.0 even after delete chardev device, the connection is not disconnected, My current assumption is that char-socket object ref count is not 0 after connection_free.
My question is is there a simple way to track ref count for a specific object? thank you. On Wed, Feb 9, 2022 at 3:07 PM Jiatong Shen <yshxxsjt...@gmail.com> wrote: > Hello community, > > I am testing vhost-user-blk. the virtual machine is started with the > following command > > ./x86_64-softmmu/qemu-system-x86_64 \ > --enable-kvm \ > -smp 2 \ > -chardev > socket,id=chr-vu-virtio-disk0,path=/var/lib/nova/volume-04789a9b-21ce-4270-89bd-638700a0e56c,reconnect=10 > \ > -device > vhost-user-blk-pci,bus=pci.0,addr=0x8,chardev=chr-vu-virtio-disk0,id=virtio-disk0 > \ > -chardev > socket,id=chr-vu-virtio-disk1,path=/var/lib/nova/volume-9590b74a-c652-4e97-a88d-f736000b4886,reconnect=10 > \ > -device > vhost-user-blk-pci,bus=pci.0,addr=0x9,chardev=chr-vu-virtio-disk1,id=virtio-disk1 > \ > -m 2048 \ > -overcommit mem-lock=off \ > -smp 2,sockets=2,dies=1,cores=1,threads=1 \ > -object > memory-backend-file,id=ram-node0,mem-path=/dev/hugepages/libvirt/qemu/7-instance-00000005,share=on,prealloc=on,size=2147483648,host-nodes=0,policy=bind > \ > -numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \ > -monitor stdio \ > -vnc :0 > > the two devices are hosted by spdk vhost application > > it uses two vhost-user-blk devices. then in the monitor, I execute > > device_del virtio-disk1 > > the command completed successfully and in the virtual machine the disk is > gone. > > but when I execute spdk vhost_delete_controller, this command will fail > with spdk vhost application complained > > [2022-02-09 14:52:30.487815] vhost.c:1013:vhost_dev_unregister: *ERROR*: > Controller volume-9590b74a-c652-4e97-a88d-f736000b4 > > it looks like qemu does not disconnect unix socket connection even though > the device is removed. > > My question is: is device_del enough? do I need to remove chardev as well? > thank you. > > -- > > Best Regards, > > Jiatong Shen > -- Best Regards, Jiatong Shen
