From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 47451] need to re-load driver in guest to make a hot-plug VF
 work
Date: Fri, 28 Sep 2012 06:07:50 +0000 (UTC)
Message-ID: <20120928060750.E9B6C11FC39@bugzilla.kernel.org>
References: <bug-47451-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=47451





--- Comment #4 from Jay Ren <yongjie.ren@intel.com>  2012-09-28 06:07:50 ---
(In reply to comment #3)
> (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?

No, replacing flag value with 'IRQF_NO_THREAD' can't make PCIe NIC hot-plug
work.
Can you try with your commit "a76beb14123a6" ?
BTW, sometimes, this bug is not so stable. Using '-m 512 -smp 2' option for
qemu-kvm commandline to start a RHEL6.x guest will make it very easy to
reproduce.

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