I use parallels and vm software to run Windows and Linux on my Apple machines. When running Windows (or Linux) on a Retina MacBook Pro, what resolution does it report?
According to AnandTech:
This is a report about Windows via bootcamp. I don't know how this differs from Windows being used in a virtual machine. It would probably also depend on the options that the VM software offers.
When using the NVIDIA drivers on Linux (and on Windows too) you can select the full native panel resolution (2880x1800). You can also select any of a number of scaled resolutions which don't look as sharp. In general, running at native resolution is actually less of a problem for Linux than it is in Windows and OS X because of the way it's designed. There are no blurry fonts on 3rd party apps like on OS X and it is easier to set your DPI so that apps are scaled properly than on Windows (it is set automatically in Linux).
OpenSuSE needs a little help during installation, but after that seems to run at native 2880x1800 just fine. See this comment in particular: http://forums.opensuse.org/english/get-technical-help-here/laptop/476258-howto-2012-retina-display-macbook-pro-opensuse-linux.html#post2470745
VMware Fusion still doesn't support he resolution very well, here's a workaround until they fix it. http://tumblr.moontrap.net/post/25263035180/vmware-fusion-retina-macbook-pro-linux