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Re: [Qemu-devel] [libvirt] ARM KVM GICv3 Support


From: Eric Blake
Subject: Re: [Qemu-devel] [libvirt] ARM KVM GICv3 Support
Date: Tue, 2 Feb 2016 08:52:12 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

On 02/02/2016 07:05 AM, Christoffer Dall wrote:

>>
>> I'm not familiar enough with libvirt, nor the use of QMP, to really argue
>> one way or another, but I find it a bit strange that we'd prefer libvirt
>> to query two entities over one. And, why should the libvirt installed on
>> a particular host prefer gicv3 as the default, just because KVM supports
>> it, even when QEMU does not? 
> 
> I think the assumption here is that if you install a recent libvirt you
> also install a recent QEMU.  You always have the risk of things not
> working if you have too old a QEMU, right?

Libvirt exists for providing back-compat glue.  The following
combinations are supported:

old libvirt, old qemu
new libvirt, old qemu
new libvirt, new qemu

and it is only this combination that might require a libvirt upgrade to
work correctly:

old libvirt, new qemu

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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