Debian 10 Buster
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KVM : Configure SPICE Server2019/07/23

Install Desktop Virtualization "SPICE ( Simple Protocol for Independent Computing Environment )".
It's possible to connect to virtual machines from remote client computer.
[1] Edit existing virtual machine's xml-file and start virtual machine with SPICE like follows.
The example on this site shows to create a virtual machine without graphics,
so it's OK to change settings like follows, but if you created virtual machine with graphics, Remove "<graphics>***" and " <video>***" sections in xml file because qxl is used for graphics.
# edit the configration of [debian]

virsh edit debian
<domain type='kvm'>
    <libosinfo:libosinfo xmlns:libosinfo="">
    # add follows
    # set any password for [passwd=***] section
    # set a uniq slot number for [slot=***]
    <graphics type='spice' port='5900' autoport='no' listen='' passwd='password'>
      <listen type='address' address=''/>
      <model type='qxl' ram='65536' vram='32768' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>

Domain debian XML configuration edited.

# start VM

virsh start debian

Domain debian started
[3] By the way, if you'd like to enable SPICE on initial creating of virtual machine, specify like follows. Then, it's possible to install Systems with SPICE which requires GUI like Windows without installing Desktop Environment on KVM Host computer.
virt-install \
--name Win2k19 \
--ram 6144 \
--disk path=/var/kvm/images/Win2k19.img,size=100 \
--vcpus=4 \
--os-type windows \
--os-variant=win2k19 \
--network bridge=br0 \
--graphics spice,listen=,password=password,keymap=ja \
--video qxl \
--cdrom /tmp/Win2019_JA-JP.ISO
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