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short term:
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- physical memory cache (reduce qemu-fast address space size to about 32 MB)
- better code fetch
- XP security bug
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- handle Self Modifying Code even if modifying current TB (BE OS 5 install)
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- cycle counter for all archs
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- TLB code protection support for PPC
- add sysenter/sysexit and fxsr for L4 pistachio 686
- basic VGA optimizations
- disable SMC handling for ARM/SPARC/PPC
- see undefined flags for BTx insn
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- user/kernel PUSHL/POPL in helper.c
- keyboard output buffer filling timing emulation
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- return UD exception if LOCK prefix incorrectly used
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- cmos clock update and timers
- test ldt limit < 7 ?
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- tests for each target CPU
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- fix CCOP optimisation
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- fix all remaining thread lock issues (must put TBs in a specific invalid
  state, find a solution for tb_flush()).
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- fix arm fpu rounding (at least for float->integer conversions)
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- SMP support
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lower priority:
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- suppress shift_mem ops
- fix some 16 bit sp push/pop overflow (pusha/popa, lcall lret)
- sysenter/sysexit emulation
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- optimize FPU operations (evaluate x87 stack pointer statically)
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- add IPC syscalls
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- use -msoft-float on ARM
- use kernel traps for unaligned accesses on ARM ?
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- handle rare page fault cases (in particular if page fault in heplers or
  in syscall emulation code).
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- fix thread stack freeing (use kernel 2.5.x CLONE_CHILD_CLEARTID)
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- more syscalls (in particular all 64 bit ones, IPCs, fix 64 bit
  issues, fix 16 bit uid issues)
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- use page_unprotect_range in every suitable syscall to handle all
  cases of self modifying code.
- use gcc as a backend to generate better code (easy to do by using
  op-i386.c operations as local inline functions).
- add SSE2/MMX operations