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Re: [Qemu-devel] [RFC v2] libvirt vGPU QEMU integration


From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [RFC v2] libvirt vGPU QEMU integration
Date: Tue, 20 Sep 2016 17:44:45 +0100
User-agent: Mutt/1.7.0 (2016-08-17)

On Tue, Sep 20, 2016 at 10:12:20PM +0530, Kirti Wankhede wrote:
> 
> 
> On 9/20/2016 10:06 PM, Daniel P. Berrange wrote:
> > On Tue, Sep 20, 2016 at 10:01:18PM +0530, Kirti Wankhede wrote:
> >>
> >>
> >> On 9/20/2016 8:44 PM, Daniel P. Berrange wrote:
> >>> On Tue, Sep 20, 2016 at 05:05:43PM +0200, Paolo Bonzini wrote:
> >>>>
> >>>>
> >>>> On 20/09/2016 16:58, Daniel P. Berrange wrote:
> >>>>>>> As I've said in my earlier reply - libvirt will *NOT* support passing
> >>>>>>> arbitrary vendor specific parameters as a blob via the XML. Everything
> >>>>>>> that appears in the XML must be *fully* specified and explicitly
> >>>>>>> represented in the XML  as a distinct attribute or element.
> >>>>>>
> >>>>>> Are generic key/value attributes (e.g. a <attribute> element) 
> >>>>>> acceptable?
> >>>>>
> >>>>> Only if libvirt has a known list of valid attribute key names upfront.
> >>>>> We don't want to just blindly expose arbitary vendor specific keys 
> >>>>> exposed
> >>>>> by the kernel. Libvirt's job is to ensure the XML representation is 
> >>>>> vendor
> >>>>> portable
> >>>>
> >>
> >> In key/value attributes (taking example from proposed xml file)
> >>
> >> <attribute name='resolution'>2560x1600</attribute>
> >>
> >> 'Key' (i.e. 'resolution') should be known upfront, not the value, right?
> > 
> > Yes, the actual value is not important - only its structured.
> > ie, libvirt would check that it is in the format '$WIDTHx$HEIGHT'
> > and reject it if not.
> > 
> 
> In this particular example, libvirt checks if its integer? or value
> could be 2560x1600 or 4096x4096 both are valid?
>
> Does libvirt accept string value?

Err, as I said, we'd validate that its in the format '$WIDTHx$HEIGHT'


Regards,
Daniel
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