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

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Message-ID: <20150330201721.GF7031@thinpad.lan.raisama.net>
Date:	Mon, 30 Mar 2015 17:17:21 -0300
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Michael Mueller <mimu@...ux.vnet.ibm.com>
Cc:	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Christian Borntraeger <borntraeger@...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>,
	Daniel Hansel <daniel.hansel@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 11/15] target-s390x: New QMP command query-cpu-model

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).

> 
> Alias names are resolved to their respective machine type and GA names
> already during cpu instantiation. Thus, also a cpu model like 'host'
> which is implemented as alias will return its normalized cpu model name.
> 
> Furthermore the patch implements the following function:
> 
> - s390_cpu_models_used(), returns true if S390 cpu models are in use
> 
> Signed-off-by: Michael Mueller <mimu@...ux.vnet.ibm.com>
[...]

-- 
Eduardo
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