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

Laurent Vivier
2007-08-29T16:39:45Z

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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