On Mon, Mar 01, 2010 at 09:45:46PM +0900, Takuya Yoshikawa wrote:Gleb Natapov wrote:Yes, I am planning to make it more independent from KVM that it is nowI am looking at improving KVM x86 emulator. Current code does notDoes your plan also include making the emulator independent of KVM?
(by adding more callbacks to x86_emulate_ops).
Could you tell me about the future plan if possible?We saw a lot of problems and shortcomings in the emulator recently, so
the plan is to improve its correctness. There is also a requirement to be
able single step emulated code. Having setjmp/longjmp will greatly simplify
the code. What are you interested in?
handle some special cases correctly (code execution from ROM, ins/outs
to/from MMIO) and many exception conditions during instruction emulation
are not handled correctly. There is a lot of code in emulator that is
there only for exception propagation. Using setjmp/longjmp will be very
beneficial here as exception condition during instruction execution
maps very naturally to setjmp/longjmp, so my question is what about
adding setjmp/longjmp implementation to the kernel, or alternatively,
if there is a fear that it can be abused, add it locally to emulator.c?
Note that instruction emulation is always done in process context.
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