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Date: Tue, 16 Jul 2013 08:19:48 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v5 05/14] vl: handle "-device dimm"
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To: Hu Tao <hutao@cn.fujitsu.com>
Cc: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>, Bandan Das <bsd@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, gaowanlong@cn.fujitsu.com, qemu-devel@nongnu.org

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?

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