KVM: x86 emulator: Specialize decoding for insns with 66/f2/f3 prefixes

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Most SIMD instructions use the 66/f2/f3 prefixes to distinguish between
different variants of the same instruction.  Usually the encoding is quite
regular, but in some cases (including non-SIMD instructions) the prefixes
generate very different instructions.  Examples include XCHG/PAUSE,
MOVQ/MOVDQA/MOVDQU, and MOVBE/CRC32.

Allow the emulator to handle these special cases by splitting such opcodes
into groups, with different decode flags and execution functions for different
prefixes.

Signed-off-by: Avi Kivity <avi@redhat.com>

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This commit is contained in:

Avi Kivity 2011-03-29 11:34:38 +02:00

parent 5037f6f324

commit 0d7cdee83a

1 changed files with 25 additions and 1 deletions

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arch/x86/kvm/emulate.c

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