From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: [PATCH] kvm: Move kvm_allows_irq0_override() to target-i386
Date: Tue, 24 Jul 2012 10:58:04 +0200
Message-ID: <500E639C.9030205@siemens.com>
References: <1342811652-16931-1-git-send-email-peter.maydell@linaro.org> <500A52BF.9080207@web.de> <CAFEAcA8DJ6mZCEbwJjSWEQRzQe58xnL47Vv-oXzEd6aP+NxKkw@mail.gmail.com> <500D42E2.4000009@redhat.com> <CAFEAcA82QQeo1isiQce478wMqURZugoaKQN5cdsR16oRSmVZ4Q@mail.gmail.com> <500D4D12.1060603@redhat.com> <CAFEAcA9tmYzSsnp+fWf2Ysz7KWSgsnHk+nahD0uT7hxZwEo-+g@mail.gmail.com> <500D53DB.5080005@redhat.com> <CAFEAcA_WCT1VLMSLjDyfWKw1=8gzoAT+di5LtHytDEYtYGZQbA@mail.gmail.com> <500D5FEE.1010006@redhat.com> <CAFEAcA-hC9Kgrgg0yoAXONWDr9JdcbGbv3JHgmxsQJQF5Z+rNg@mail.gmail.com> <500E61CD.9080200@redhat.com> <CAFEAcA_0d4CRyPk-ii7g-gZG6Yo6wL=aogNxdr6W1DTWU8eG6Q@mail.gmail.com>
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Cc: Avi Kivity <avi@redhat.com>, qemu-devel@nongnu.org,
	Marcelo Tosatti <mtosatti@redhat.com>, patches@linaro.org,
	kvm <kvm@vger.kernel.org>, Alexander Graf <agraf@suse.de>
To: Peter Maydell <peter.maydell@linaro.org>
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On 2012-07-24 10:54, Peter Maydell wrote:
> On 24 July 2012 09:50, Avi Kivity <avi@redhat.com> wrote:
>> On 07/23/2012 08:58 PM, Peter Maydell wrote:
>>> The other related thing that
>>> might be surprising for x86-background people is that being
>>> able to present the guest with a virtual CPU that looks like
>>> a pre-virtualization CPU (eg the A9) isn't really an intended
>>> use case either. (The ARM world has much less of the 'everything
>>> must be fully backwards compatible for existing OSes' than x86...)
>>
>> I expect this to change once ARM servers become a reality.
> 
> Yes, compatibility for guests migrating forwards from old
> virt-supporting host CPUs to new ones is important; it's
> only the pre-virt to post-virt that is less interesting.

One of the many use cases for virtualization on other archs is precisely
this (we run 286 code on latest and greatest CPUs in KVM). There should
be quite a few embedded systems out there that could happily be
consolidated on a more modern and powerful ARM platform via virtualization.

Jan

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