Chardev: delete the QemuOpts reserved in vm_config_groups

[????????????]

We have found that qemu cannot plug in the previously unplugged device.
        start qemu with the following command:
./qemu-system-x86_64 -enable-kvm -m 8192 -smp 16 \
   -object 
memory-backend-file,id=mem,size=8192M,mem-path=/dev/hugepages,share=on \
   -numa node,memdev=mem -mem-prealloc \
   ...
   -chardev 
socket,id=drive-virtio-disk1,path=/var/run/spdk/vhost_blk_socket-30dcf467-486a-45cf-b754-093bf5cf24d1,reconnect=10
 \
   -device 
vhost-user-blk-pci,chardev=drive-virtio-disk1,num-queues=1,bus=pci.0,addr=0x5,id=virtio-disk1
 \
   ...


(qemu) info chardev
serial0: filename=pty:/dev/pts/0
drive-virtio-disk1: filename=unix:
charmonitor:
filename=unix:/usr/local/var/lib/libvirt/qemu/domain-55-e59039db-d576-40db-a/monitor.sock,server
(qemu) device_del virtio-disk1
(qemu) chardev-remove drive-virtio-disk1
(qemu) info chardev
serial0: filename=pty:/dev/pts/0
charmonitor:
filename=unix:/usr/local/var/lib/libvirt/qemu/domain-55-e59039db-d576-40db-a/monitor.sock,server
(qemu) chardev-add 
socket,id=drive-virtio-disk1,path=/var/run/spdk/vhost_blk_socket-30dcf467-486a-45cf-b754-093bf5cf24d1,reconnect=10
device failed: Duplicate ID 'drive-virtio-disk1' for chardev Error: Parsing 
chardev args failed


The root cause of this issue is that the QemuOpts is still reserved in 
vm_config_groups list,
so qemu_opts_create will fail with the error above. So the QemuOpts should be 
removed when
invoking qmp_chardev_remove.




Signed-off-by: Zhoujian Yu <win...@tencent.com&gt;
Reviewed-by: Lei Wang <kaierw...@tencent.com&gt;
Reviewed-by: Xun Ni <richar...@tencent.com&gt;
Reviewed-by: Zhigang Lu <tonn...@tencent.com&gt;
---
&nbsp;chardev/char.c | 6 ++++++
&nbsp;1 file changed, 6 insertions(+)


diff --git a/chardev/char.c b/chardev/char.c
index 398f09d..d2087bd 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -37,6 +37,7 @@
&nbsp;#include "qemu/help_option.h"
&nbsp;#include "qemu/module.h"
&nbsp;#include "qemu/option.h"
+#include "qemu/option_int.h"
&nbsp;#include "qemu/id.h"
&nbsp;#include "qemu/coroutine.h"
&nbsp;#include "qemu/yank.h"
@@ -1159,6 +1160,7 @@ ChardevReturn *qmp_chardev_change(const char *id, 
ChardevBackend *backend,
&nbsp;void qmp_chardev_remove(const char *id, Error **errp)
&nbsp;{
&nbsp; &nbsp; &nbsp;Chardev *chr;
+&nbsp; &nbsp;QemuOpts *opts;
&nbsp;
&nbsp; &nbsp; &nbsp;chr = qemu_chr_find(id);
&nbsp; &nbsp; &nbsp;if (chr == NULL) {
@@ -1175,6 +1177,10 @@ void qmp_chardev_remove(const char *id, Error **errp)
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;return;
&nbsp; &nbsp; &nbsp;}
&nbsp; &nbsp; &nbsp;object_unparent(OBJECT(chr));
+&nbsp; &nbsp; /* delete the opts reserved in vm_config_groups list.&nbsp; */
+&nbsp; &nbsp; opts = qemu_opts_find(qemu_find_opts("chardev"), id);
+&nbsp; &nbsp; if (opts)
+&nbsp; &nbsp; &nbsp; &nbsp; qemu_opts_del(opts);
&nbsp;}
&nbsp;
&nbsp;void qmp_chardev_send_break(const char *id, Error **errp)
--&nbsp;
1.8.3.1