From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carsten Otte Subject: Re: [PATCH 0/9] S390x KVM support Date: Thu, 22 Oct 2009 12:22:53 +0200 Message-ID: <4AE0327D.7010809@de.ibm.com> References: <1255963059-10298-1-git-send-email-agraf@suse.de> <4ADDE7E3.9090601@de.ibm.com> <4AE0210D.9020409@redhat.com> <98DC9E4C-7FFA-4F05-A2E8-0B5DF546891C@suse.de> <4AE02B8E.6070202@redhat.com> <8D99A5FD-8A2E-4DA9-90A5-6935F677F9FD@suse.de> <4AE02DE2.7010803@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Alexander Graf , qemu-devel , uli@suse.de, Carsten Otte , hare@suse.de, KVM list To: Avi Kivity Return-path: Received: from mtagate7.de.ibm.com ([195.212.17.167]:45638 "EHLO mtagate7.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752664AbZJVKWo (ORCPT ); Thu, 22 Oct 2009 06:22:44 -0400 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate7.de.ibm.com (8.13.1/8.13.1) with ESMTP id n9MAMiR0019742 for ; Thu, 22 Oct 2009 10:22:44 GMT Received: from d12av04.megacenter.de.ibm.com (d12av04.megacenter.de.ibm.com [9.149.165.229]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id n9MAMh6w3313848 for ; Thu, 22 Oct 2009 12:22:43 +0200 Received: from d12av04.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av04.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n9MAMgVP027787 for ; Thu, 22 Oct 2009 12:22:43 +0200 In-Reply-To: <4AE02DE2.7010803@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > Right, but why? x86 qemu doesn't care about either pc or eflags (with > in-kernel irqchip, which s390 essentially is). For different reasons. Most prominent for setting the condition code, which is a sideband result of most instructions that indicates whether or not the instruction actually worked - similar to the exception model in high level programming languages.