[Bug 47451] need to re-load driver in guest to make a hot-plug VF work

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https://bugzilla.kernel.org/show_bug.cgi?id=47451





--- Comment #3 from Alex Williamson <alex.williamson@redhat.com>  2012-09-20 04:36:50 ---
(In reply to comment #2)
> (In reply to comment #1)
> >Can we narrow down the kvm.git commit range at all?  The
> > one provided is over 12k commits covering v3.4-rc3 to v3.5-rc6.  Thanks
> I did more testing.
> Do you remember the bug #43328 ( VT-d/SR-IOV totally doesn't work in guest)?
> Just use your fix commit for that bug, I'll meet this hot-plug issue.
> Is there a chance your patch fixed one bug but introduced another one? :)
> 
> commit a76beb14123a69ca080f5a5425e28b786d62318d
> Author: Alex Williamson <alex.williamson@redhat.com>
> Date: Mon Jul 9 10:53:22 2012 -0600
> 
>     KVM: Fix device assignment threaded irq handler

Thanks for the narrowing it down.  It looks like perhaps that patch was
ineffective at trying to keep us out of using IRQF_ONESHOT due to
irq_setup_forced_threading() re-enabling it.  Does the problem go away if you
change the two calls to request_threaded_irq() in that commit to use
IRQF_NO_THREAD for the flag value in place of 0?

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