[libvirt] [PATCH] qemu: Use memory-object-file when needed

[Martin Kletzander]

On Wed, Jan 13, 2016 at 02:14:58PM +0530, Shivaprasad bhat wrote:
>Hi Martin,
>
>I see, the memory from the node specified in numatune is used correctly.
>Wit your change memory-backend-file is used to enforce that
>
>But, I see the migrations from old versions(my case, 1.2.5) seems to fail
>as there was no backend-file before and only backend-ram.
>

Oh, you are absolutely right, that's why we kept the code as is, I
totally forgot about the reasoning behind this.  If this doesn't affect
guest ABI, then we could use a migration flag for deciding which
approach to take.  However, I don't feel strongly for the added
complexity that such change would make.  Not in the migration code, but
rather the command-line change.

Anyway, we need to keep doing what we were before, so this patch is a
SNACK.  We can decide what to do later on.

>Unknown ramblock "ppc_spapr.ram", cannot accept migration
>2016-01-13T08:16:17.488267Z qemu-system-ppc64-hp: error while loading state
>for instance 0x0 of device 'ram'
>
>Should we be using -mem-path /dev/hugepages/libvirt/qemu along with
>memory-backend-ram instead?
>

Both or none, plus this is not the root cause.
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