Currently the emulator decoder is indirect in two ways: groups are looked up
in a separate table based on group number; and opcode execution is looked up
in a big switch (actually two) after the opcode flags lookup.
This patchset converts groups to direct decode and begins the work for opcode
decode.
The motivations are:
- reduce errors from discrepancies between the two tables (like we had for
IRET)
- make the code easier to read, removing many switch () statements
- eventually remove the #UD mini-decoder in x86.c by adding subgroup support
to the emulator
Avi Kivity (22):
KVM: x86 emulator: drop parentheses in repreat macros
KVM: x86 emulator: introduce 'struct opcode'
KVM: x86 emulator: Add wrappers for easily defining opcodes
KVM: x86 emulator: move group tables to top
KVM: x86 emulator: reserve group code 0
KVM: x86 emulator: allow specifying group directly in opcode
KVM: x86 emulator: convert group 1 to new style
KVM: x86 emulator: convert group 1A to new style
KVM: x86 emulator: convert group 3 to new style
KVM: x86 emulator: convert group 4 to new style
KVM: x86 emulator: convert group 5 to new style
KVM: x86 emulator: convert group 7 to new style
KVM: x86 emulator: convert group 8 to new style
KVM: x86 emulator: convert group 9 to new style
KVM: x86 emulator: drop support for old-style groups
KVM: x86 emulator: move ByteOp and Dst back to bits 0:3
KVM: x86 emulator: store x86_emulate_ops in emulation context
KVM: x86 emulator: allow storing emulator execution function in
decode tables
KVM: x86 emulator: move x86_decode_insn() downwards
KVM: x86 emulator: move decode tables downwards
KVM: x86 emulator: allow repeat macro arguments to contain commas
KVM: x86 emulator: convert some push instructions to direct decode
arch/x86/include/asm/kvm_emulate.h | 10 +-
arch/x86/kvm/emulate.c | 1253 +++++++++++++++++++-----------------
arch/x86/kvm/x86.c | 7 +-
3 files changed, 661 insertions(+), 609 deletions(-)
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