If an instruction is present in the decode tables but not in the execution switch, it will be emulated as a NOP. An example is IRET (0xcf). Fix by adding default: labels to the execution switches. Signed-off-by: Avi Kivity <avi@xxxxxxxxxx> --- arch/x86/kvm/emulate.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index b38bd8b..a12512d 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3029,6 +3029,8 @@ special_insn: if (c->modrm_reg == 5) goto jump_far; goto grp45; + default: + goto cannot_emulate; } writeback: @@ -3354,6 +3356,8 @@ twobyte_insn: if (rc != X86EMUL_CONTINUE) goto done; break; + default: + goto cannot_emulate; } goto writeback; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
