Re: [Libvir] PATCH: Allow libvirtd configuration for QEMU VNC server

The QEMU VNC server spawned by the QEMU driver in libvirt is hardcoded to start off on 127.0.0.1, unless the person creating a guest overides this in the XML passed to libvirt. If wanting to setup off-host VNC access, it is much much more convenient to be able to set the system wide default to be 0.0.0.0 than to specify 0.0.0.0 for each VM created. In addition, it is desirable to be able to configure use of TLS and x509 certificates for the VNC servers system wide. In Xen world this is already possible through the /etc/xen/xend-config.sxp configuration file. In QEMU world, libvirtd takes the place of XenD. The /etc/libvirt/libvirtd.conf file though is for the daemon as a whole. There is no config file for the QEMU driver in libvirt itself. So this patch extends the QEMU driver to be able to load /etc/libvirt/qemu.conf and configure a handful of options. - vnc_listen = "0.0.0.0" - the address for VNC to listen on. Defaults to 127.0.0.1 for security sake - vnc_tls = 1 - turn on use of TLS extension - vnc_tls_x509_verify - request client certificates for auth - vnc_tls_cert_dir - the location of the VNC server certs. Defaults to /etc/pki/libvirt-vnc The code for building command line args for the -vnc flag to QEMU takes care to look at these options & add approprivate syntax.