Windows2000 uses it during boot. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=50921
Signed-off-by: Gleb Natapov <[email protected]> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 39171cb..92c7292 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2852,6 +2852,27 @@ static int em_das(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int em_aad(struct x86_emulate_ctxt *ctxt) +{ + u8 al = ctxt->dst.val & 0xff; + u8 ah = (ctxt->dst.val >> 8) & 0xff; + + al = (al + (ah * ctxt->src.val)) & 0xff; + + ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al; + + ctxt->eflags &= ~(X86_EFLAGS_PF | X86_EFLAGS_SF | X86_EFLAGS_ZF); + + if (!al) + ctxt->eflags |= X86_EFLAGS_ZF; + if (!(al & 1)) + ctxt->eflags |= X86_EFLAGS_PF; + if (al & 0x80) + ctxt->eflags |= X86_EFLAGS_SF; + + return X86EMUL_CONTINUE; +} + static int em_call(struct x86_emulate_ctxt *ctxt) { long rel = ctxt->src.val; @@ -3801,7 +3822,7 @@ static const struct opcode opcode_table[256] = { D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret), /* 0xD0 - 0xD7 */ D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM), - N, N, N, N, + N, I(DstAcc | SrcImmByte | No64, em_aad), N, N, /* 0xD8 - 0xDF */ N, N, N, N, N, N, N, N, /* 0xE0 - 0xE7 */ -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
