From what I gathered you have 2 solutions for GPU passtrough : if you're a Unix guru and have plenty of time to spare you might make it work with Xen or if you have money VMWare looks easier but you may need a license and special hardware (if you have a regular Nvidia graphic card it won't work, you need an ATI or a Nvidia Quadro).

No. You just need to read Alex Williamson blog, for nvidia you need to patch drivers a bit - it is not hard. And compared to the price of macpro with discrete GPU - not that expensive either.

http://vfio.blogspot.bg/

just googling vfio kvm leads you to very thorough arch linux topic (with a bit of drama on the end, whatever)

For anyone else, thinking hmm, that sounds easy. The TL;DR is that you don't "just need to read" Alex's blog, you need to read, think, try, fix, bug search, rinse, repeat, take on board a number of complex ideas and concepts, and/or buy ideal hardware. The arch linux topic is very long! I've read most of it as it came in, but reading that whole thing for tidbits and fixes that Google doesn't always turn up isn't quick or easygoing. Good luck!

That was 3 years ago. Right now the process is more streamlined.

Of course I assume that people that frequent hacker news are geeks and tinkerers.

Yeah, I'm definitely a geek and tinkerer, but testing in Safari is work stuff I don't like, and the only way to do it properly is with actual Apple hardware.