These are the x86, MIPS and s390 changes; PPC and ARM will come in a few days. MIPS and s390 have little going on this release; just bugfixes, some small, some larger. The highlights for x86 are nested VMX improvements (Jan Kiszka), optimizations for old processor (up to Nehalem, by me and Bandan Das), and a lot of x86 emulator bugfixes (Nadav Amit). Stephen Rothwell reported a trivial conflict with the tracing branch.