Re: [Xen-devel] Question about SR-IOV migration

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

Please don't top post, see
http://wiki.xen.org/xenwiki/AskingXenDevelQuestions

On Wed, 2011-11-02 at 09:27 -0400, software NJU wrote:
> Thanks for your quick reply and great solution. 
> However, I'm still not sure one thing: Do you mean that live migration
> is impossible because of hardware limitation? I'm reading the SR-IOV
> specification now. And it mentioned that a VF can migrate to another
> system through some kind of methods. But the migration may need the
> support of MR-IOV.
> What do you think of the saying in the specification? I'm not sure
> what the migration is in the specification.

I'm afraid I don't know precisely what the spec says here but (guessing)
I suppose MR-IOV might allow you to ensure that you see the actual same
device from two different host machines which would alleviate some of
the problems associated with managing the hardware constraints when
migrating.

However I think in order to migrate with a piece of hardware attached
somebody (either guest or tooling) would still need to know how to save
the state of that specific device and restore it on the other end.
Nothing in a Xen system today performs that function. I'm not sure that
MR-IOV helps with that problem AFAIK.

Ian.



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