From: Nadav Amit Date: Fri, 18 Apr 2014 00:35:10 +0000 (+0300) Subject: KVM: x86: IN instruction emulation should ignore REP-prefix X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=e6e39f0438bc4b0da9334ca42337775c7a00db21;p=deliverable%2Flinux.git KVM: x86: IN instruction emulation should ignore REP-prefix The IN instruction is not be affected by REP-prefix as INS is. Therefore, the emulation should ignore the REP prefix as well. The current emulator implementation tries to perform writeback when IN instruction with REP-prefix is emulated. This causes it to perform wrong memory write or spurious #GP exception to be injected to the guest. Signed-off-by: Nadav Amit Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index f3834bbca1d7..e8a58409b5ac 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1324,7 +1324,8 @@ static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, rc->end = n * size; } - if (ctxt->rep_prefix && !(ctxt->eflags & EFLG_DF)) { + if (ctxt->rep_prefix && (ctxt->d & String) && + !(ctxt->eflags & EFLG_DF)) { ctxt->dst.data = rc->data + rc->pos; ctxt->dst.type = OP_MEM_STR; ctxt->dst.count = (rc->end - rc->pos) / size;