2. In the guest, file data seems to be different. Am I doing something wrong here?

Host (file write)

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-open", "arguments":{"path":"/tmp/testqga","mode":"w+"}}'

{"return":1000}

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-write", "arguments":{"handle":1000,"buf-b64":"abcdefghijklmnopqrstuvwxyz"}}'

{"return":{"count":18,"eof":false}}

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-close", "arguments":{"handle":1000}}'

{"return":{}}

Host (file read)

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-open", "arguments":{"path":"/tmp/testqga","mode":"r"}}'

{"return":1001}

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-read", "arguments":{"handle":1001,"count":18}}'

{"return":{"count":18,"buf-b64":"abcdefghijklmnopqrstuvwx","eof":false}}

[root@sdsr720-14 ~]# virsh qemu-agent-command vm_04 '{"execute":"guest-file-close", "arguments":{"handle":1001}}'

{"return":{}}

Guest

[root@vm04 qga]# ll /tmp/testqga

-rw-rw-rw-. 1 root root 18 Jun 24 15:06 /tmp/testqga

[root@vm04 qga]# cat /tmp/testqga

i�^]y�!�9%�z)��-��1[root@vm04 qga]#

[root@vm04 qga]# od -x /tmp/testqga

0000000 b769 791d 21f8 398a 9a25 297a bbaa ba2d

0000020 31fc

0000022