Well, seeing as there are emulators for Linux, of course this is extremely easy and possible. Maybe this is why Sony is not allowing access to the graphics card. Hell, if I were to get a PS3, and I could perfectly play PS games via Linux, I'd do it. [My PC can't even handle emulating some PS games] But, I am wondering, has anyone had a go at it? See how good PS games play, and if you want to go the long stretch, PS2 games? I give links to the best emulators [in my opinion]. Although, you alone have to aquire the BIOS, whether legal or not, its up to you. XD
Of course, when you go to download, GET THE LINUX version, unless you want to mess with WINE, which would only slow down emulation anyways. For PCSX, scroll down for the one that says 1.5 Linux port, for PCSX2, go to downloads, then click the link that is "Linux", although, I am not certain whether you should try the 32 or 64 bit. Try it yourself and see!