Re: [Qemu-devel] [PATCH 05/10] qga: introduce three guest memory block commmands with stubs

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Eric Blake (2015-02-17 09:26:12)
> On 02/16/2015 08:14 PM, Michael Roth wrote:
> > From: zhanghailiang <zhang.zhanghailiang@huawei.com>
> > 
> > Introduce three new guest commands:
> > guest-get-memory-blocks, guest-set-memory-blocks, guest-get-memory-block-size.
> 
> Sorry for the late review, but I think guest-get-memory-block-size is
> the wrong command to add.
> 
> 
> > +##
> > +# @guest-get-memory-block-size:
> > +#
> > +# Get the the size (in bytes) of a memory block in guest.
> > +# It is the unit of memory block online/offline operation (also called Logical
> > +# Memory Hotplug).
> > +#
> > +# Returns: memory block size in bytes.
> > +#
> > +# Since 2.3
> > +##
> > +{ 'command': 'guest-get-memory-block-size',
> > +  'returns': 'int' }
> 
> Any QAPI command that returns a bare int instead of a dictionary is
> non-extensible, and therefore of suspect design.  I think it would be
> better to have:
> 
> { 'command': 'guest-get-memory-block-info',
>   'returns': { 'size': 'int' } }
> 
> to allow for future extension.

It seems like a reasonable suggestion to me. I can change it in my
tree if there are no objections. zhanghailiang?

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