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Re: [libvirt] [PATCH 20/24] hostdev: Save netdev configuration of actual device

On Wed, 2016-03-16 at 19:50 +0100, Andrea Bolognani wrote:
> > Thinking in terms of current code - step4 will take the everything that
> > was formerly on the active list and:
> >  
> > 1. Steal the pcidevs entry
> >  
> > 2. Call virHostdevReattachPCIDevice with the stolen lookaside pcidevs
> > entry...  While it appears to be an actual, it isn't. Of course, I think
> > you address that in patch 22, but trying not to get too far ahead.
> >  
> >     2a. If the device is not managed, then add to the inactiveList and
> > return (call virPCIDeviceFree if unsuccessfully add). What really
> > confuses me here is why we place onto the inactiveList if not managed;
> > however, you address that in patch22. Still it could be addressed
> > earlier if that is a separate bug...
> I would have to go back to patch 22 to make sure this is really
> handled correctly there: I'm pretty confident it is, but I've
> been wrong before! Most recently, while writing this series :(
> The incorrect behaviour you've noticed before has actually been
> introduced by patch 15. Before that, 'pcidevs' in
> virHostdevReAttachPCIDevices() was obtained by copying instances
> off the active list, hence virHostdevReattachPCIDevice() would
> really be passed (a copy of) an actual; now that's no longer the
> case, and the code has become incorrect.
> Will fix as part of the respin.

Turns out that fixing this in a separate patch would basically
mean reverting the patch that introduced the behaviour in the
first place. I don't think it would be worth the effort.

I've confirmed that the fix is actually in patch 22, as
suspected, so we should be good anyway.


Andrea Bolognani
Software Engineer - Virtualization Team

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