[libvirt] More logs from libvirt+qemu+VNC+SASL

Hello I'm working on supporting VNC console on FIPS-enabled oVirt hosts[1]. I made qemu use SASL as authentication method instead of regular passwords. However, no matter what I do, I can't get it to accept credentials provided with a VNC client. Is there a way to get some qemu/SASL logs? I need to understand why the credentials are not accepted. Any pointers to docs/code/old bugs appreciated. Tomo [1] https://bugzilla.redhat.com/show_bug.cgi?id=1595536