Re: [Qemu-devel] [PATCH 05/11] qemu: MSI-X support functions

[Michael S. Tsirkin]

On Wed, Jun 10, 2009 at 08:04:13PM +0100, Paul Brook wrote:
> > > If we can't start a new qemu with the same hardware configuration then we
> > > should not be allowing migration or loading of snapshots.
> >
> > OK, so I'll add an option in virtio-net to disable msi-x, and such
> > an option will be added in any device with msi-x support.
> > Will that address your concern?
> 
> Yes, as long as migration fails when you try to migrate to the wrong kind of 
> device.
> 
> Paul

I think the right way to do this, is to make sure that standard
read-only registers in PCI config space are not modified in migration
(device-specific registers could have changed as a result of guest
actions, so we can't make assumptions).
-- 
MST