On Sat, 2010-02-20 at 15:00 +0000, Nix wrote: > On 17 Feb 2010, Adam Jackson said: > > > On Tue, 2010-02-16 at 10:30 +0200, Nameer Yarkon wrote: > >> Hi, > >> > >> Does X11 still uses /dev/mem to directly manipulate the physical memory ? > > > > strace would tell you. The answer is "it depends" though. On Linux, > > most memory access goes through the PCI BAR resource files in sysfs, but > > there are some situations where we still have to use /dev/mem. > > Am I right in assuming that pretty much all of these are UMS-related? > i.e., in KMS the only thing now stopping us running X as non-root at > long last is the input-device-revocation problem?
That, and device permissions on /dev/dri/whatever, and that GEM objects are globally visible so you're still trusting that multiple X servers don't intentionally snoop on each other. - ajax
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