[Intel-wired-lan] [RFC PATCH V2 3/3] Ixgbevf: Add migration support for ixgbevf driver
Michael S. Tsirkin
mst at redhat.com
Wed Nov 25 16:22:10 UTC 2015
On Thu, Nov 26, 2015 at 12:02:33AM +0800, Lan, Tianyu wrote:
> On 11/25/2015 8:28 PM, Michael S. Tsirkin wrote:
> >Frankly, I don't really see what this short term hack buys us,
> >and if it goes in, we'll have to maintain it forever.
> >
>
> The framework of how to notify VF about migration status won't be
> changed regardless of stopping VF or not before doing migration.
> We hope to reach agreement on this first.
Well it's bi-directional, the framework won't work if it's
uni-directional.
Further, if you use this interface to stop the interface
at the moment, you won't be able to do anything else
with it, and will need a new one down the road.
> Tracking dirty memory still
> need to more discussions and we will continue working on it. Stop VF may
> help to work around the issue and make tracking easier.
>
>
> >Also, assuming you just want to do ifdown/ifup for some reason, it's
> >easy enough to do using a guest agent, in a completely generic way.
> >
>
> Just ifdown/ifup is not enough for migration. It needs to restore some PCI
> settings before doing ifup on the target machine
I'd focus on just restoring then.
--
MST
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