linux-kernel - Re: [Qemu-devel] [PATCH v4 11/15] target-s390x: New QMP command query-cpu-model

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Message-ID: <5519B01B.9010007@redhat.com>
Date:	Mon, 30 Mar 2015 14:20:43 -0600
From:	Eric Blake <eblake@...hat.com>
To:	Eduardo Habkost <ehabkost@...hat.com>,
	Michael Mueller <mimu@...ux.vnet.ibm.com>
CC:	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>, linux-kernel@...r.kernel.org,
	Alexander Graf <agraf@...e.de>, qemu-devel@...gnu.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Daniel Hansel <daniel.hansel@...ux.vnet.ibm.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andreas Faerber <afaerber@...e.de>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [Qemu-devel] [PATCH v4 11/15] target-s390x: New QMP command query-cpu-model

On 03/30/2015 02:17 PM, Eduardo Habkost wrote:
> On Mon, Mar 30, 2015 at 04:28:24PM +0200, Michael Mueller wrote:
>> This patch implements a new QMP request named 'query-cpu-model'.
>> It returns the cpu model of cpu 0 and its backing accelerator.
>>
>> request:
>>   {"execute" : "query-cpu-model" }
>>
>> answer:
>>   {"return" : {"name": "2827-ga2", "accel": "kvm" }}
> 
> If you are returning information about an existing CPU, why not just
> extend the output of "query-cpus"?
> 
> (Existing qmp_query_cpus() calls cpu_synchronize_state(), which may be
> undesired. But in this case we could add an optional parameter to
> disable the return of data that requires stopping the VCPU).

And how would libvirt learn about the existence of that optional
parameter?  Without introspection, a new command is easier to query than
learning about whether an optional parameter exists (then again, we're
hoping to get introspection into 2.4, so it may be a moot question).

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


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