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Date: Mon, 9 Jan 2017 16:45:12 +0800
From: Peter Xu <peterx@redhat.com>
Message-ID: <20170109084512.GH4135@pxdev.xzpeter.org>
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	<20170106132738.GD2461@work-vm>
	<20170109021845.GE4135@pxdev.xzpeter.org>
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Subject: Re: [Qemu-devel] [PATCH v3 0/2] VT-d migration support
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To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>, mst@redhat.com, Juan Quintela <quintela@redhat.com>, Jason Wang <jasowang@redhat.com>, Amit Shah <amit.shah@redhat.com>

On Mon, Jan 09, 2017 at 10:18:45AM +0800, Peter Xu wrote:
> On Fri, Jan 06, 2017 at 01:27:38PM +0000, Dr. David Alan Gilbert wrote:
> 
> [...]
> 
> > > (P.S. I found that split irqchip cannot work well with migration. Is
> > >  this an known issue?)
> > 
> > How did it fail?
> 
> The keyboard hangs after migration.
> 
> Command line for reference:
> 
> $qemu -M q35,kernel-irqchip=split -enable-kvm \
>       -netdev user,id=net0 \
>       -device e1000,netdev=net0 \
>       -m 512M -monitor stdio \
>       $incoming /var/lib/libvirt/images/vm1.qcow2
> 
> Here $incoming is "" for init vm, and "-incoming tcp:0:6666" for the
> dest side. Not sure whether this is reproducable issue. Looks like
> some EOI ack is missing.
> 
> Host: 4.10.0-rc1+ (I should also tried 4.6.4-301.fc24)
> Qemu: latest master
> 
> Looking into it.

The problem is that we didn't setup the first 24 gsi routing entries
(which is used by the userspace ioapic) in kernel after the migration.
Will post a fix for it later.

-- peterx