KVM: x86: ARPL emulation can cause spurious exceptions

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ARPL and MOVSXD are encoded the same and their execution depends on the
execution mode.  The operand sizes of each instruction are different.
Currently, ARPL is detected too late, after the decoding was already done, and
therefore may result in spurious exception (instead of failed emulation).

Introduce a group to the emulator to handle instructions according to execution
mode (32/64 bits). Note: in order not to make changes that may affect
performance, the new ModeDual can only be applied to instructions with ModRM.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Nadav Amit 2015-01-26 09:32:24 +02:00 • committed by Paolo Bonzini

parent 801806d956

commit 2276b5116e

1 changed files with 26 additions and 6 deletions

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arch/x86/kvm/emulate.c

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