[PATCH 0/5][RESEND] Split the emulator: decode & execute

[Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>]

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These patches split the emulator in two parts: one to decode the instruction,
the other to execute it. The decode part is then called only when needed.

[PATCH 1/5] x86_emulate-remove_unused, some cleanup: remove unused functions
[PATCH 2/5] x86_emulate-context, move all x86_emulate_memop() common variables
            between decode and execute to a structure decode_cache.

            struct decode_cache {
                u8 twobyte;
                u8 b;
                u8 lock_prefix;
                u8 rep_prefix;
                u8 op_bytes;
                u8 ad_bytes;
                struct operand src;
                struct operand dst;
                unsigned long *override_base;
                unsigned int d;
                unsigned long regs[NR_VCPU_REGS];
                unsigned long eip;
                /* modrm */
                u8 modrm;
                u8 modrm_mod;
                u8 modrm_reg;
                u8 modrm_rm;
                u8 use_modrm_ea;
                unsigned long modrm_ea;
                unsigned long modrm_val;
           };

[PATCH 3/5] x86_emulate-decode_insn, move all decoding process to function
            x86_decode_insn().
[PATCH 4/5] x86_emulate-split, emulate_instruction() calls now x86_decode_insn()
	    and x86_emulate_insn(). x86_emulate_insn() is x86_emulate_memop()
            without the decoding part.
[PATCH 5/5] x86_emulate-optimize, move emulate_ctxt to kvm_vcpu to keep emulate
            context when we exit from kvm module. Call x86_decode_insn() only
            when needed. Modify x86_emulate_insn() to not modify the context if
            it must be re-entered.

Signed-off-by: Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>
-- 
------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org  --------------
          "Software is hard" - Donald Knuth



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