Re: [Xen-devel] [Xen-users] substantial shutdown delay for PV guests with PCI -passthrough

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-03-19 at 01:25 +0100, Atom2 wrote:
> So it seems that pretty much at the start of the 10s delay the state 
> changed from 4 to 6 and stays at that value even after the first 10s 
> delay is over - whatever that means.

4 == Connected
6 == Closed

I think what is happening is that the domain is shutting down, which
causes pciback to transition to the closed state (because the f.e. went
away, so this is a reasonable thing for it to do).

The bug appears to be that libxl is trying to "hot unplug" the devices
on shutdown when they have already been effectively "cold unplugged" by
the domain going down.

Perhaps libxl__device_pci_remove_xenstore should observe that the state
is > 4 (hence closing/closed) and not bother doing anything, i.e. only
waiting iff the state is <4 (init, connecting etc)? Or unconditionally
removing the nodes if state > 4. (perhaps state 7, reconfiguring needs
handling here too)

Or perhaps the force parameter passed to remove_common (which indicates
destroy rather than unplug) ought to be propagated down to this code and
$something done with it.

Roger, Ian, any thoughts on that?

Ian.


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