[fedora-virt] is there a best clock to use?

[Tom Horsley]

Is there a HOWTO anywhere of the different ways to
make time of day clock work in virtual machines and different
ways to influence it from the qemu side of the world?

Time keeping is horrible in most of my virtual machines,
and I just wonder if there are settings I can change
in libvirt or kernel boot parameters I can apply in
the linux guest to make things slightly less horrible?

Sometimes I get the impression that the guest time is
already two or three minutes off as soon as it is
booted, and I can't imagine how that happens since I
would assume it gets a copy of the host machine time
for the emulated rtc clock in the guest. How can it
already be broken at boot time?