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Re: [libvirt] [PATCH v2 1/2] Add pcihole64 attribute to root PCI controllers



On Tue, Aug 13, 2013 at 11:53:42AM +0200, Ján Tomko wrote:
> On 08/13/2013 10:55 AM, Daniel P. Berrange wrote:
> > On Tue, Aug 13, 2013 at 10:51:04AM +0200, Ján Tomko wrote:
> >> <controller type='pci' index='0' model='pci-root' pcihole64='1'/>
> >>
> >> It can be used to adjust (or disable) the size of the 64-bit
> >> PCI hole. The size attribute is in gigabytes, since it would
> >> get rounded up to nearest GB by QEMU anyway.
> > 
> > Choosing the units based on what one specific hypervisor happens to
> > currently do has proven to be a pretty bad idea in the past. I'd say
> > we should be using KB here. Or better yet, have this as a separate
> > child element, and then support a 'units' attribute at the same time,
> > defaulting to KB. 
> > 
> 
> Would it be okay to use the largest usable unit when formatting the XML
> to make it more human-friendly?

No, because you'd be throwing away data if the user had requested less
than a GB. Outputting XML should use the smallest unit for which we
want to support, which IMHO should be KB.

Daniel
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