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Date: Thu, 22 Oct 2009 12:22:53 +0200
From: Carsten Otte <carsteno@de.ibm.com>
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Subject: [Qemu-devel] Re: [PATCH 0/9] S390x KVM support
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To: Avi Kivity <avi@redhat.com>
Cc: Carsten Otte <cotte@de.ibm.com>, KVM list <kvm@vger.kernel.org>, Alexander Graf <agraf@suse.de>, qemu-devel <qemu-devel@nongnu.org>, hare@suse.de

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.