Re: [Qemu-devel] [PATCH v5 05/14] vl: handle "-device dimm"

[Hu Tao]

On Tue, Jul 16, 2013 at 08:19:48AM +0200, Paolo Bonzini wrote:
> Il 16/07/2013 03:27, Hu Tao ha scritto:
> > > I think it's the same.  One "-numa mem" option = one "-device dimm"
> > > option; both define one range.  Unused memory ranges may remain if you
> > > stumble upon a unusable range such as the PCI window.  For example two
> > > "-numa mem,size=2G" options would allocate memory from 0 to 2G and from
> > > 4 to 6G.
> > 
> > So we can drop -dimm if we agree on -numa mem?
> 
> Yes, the point of the "-numa mem" proposal was to avoid the concept of a
> "partially initialized device" that you had for DIMMs.
> 
> BTW, how do you specify which module you are plugging in?  I.e., what if
> I have three 1G ranges at 0, 1G and 2G, and I want to plug the first and
> the third?

I think an id is still needed to identify ranges, which can be shown to
user with `info numa' or similar command, along with the corresponding
ranges.

> 
> This is especially important with hot-unplug, because then you can have
> this kind of hole in the address space.  If you migrate the VM, you have
> to reproduce the situation in the destination command line.
> 
> Paolo
>