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Date: Mon, 13 Aug 2012 21:03:12 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20120813180312.GA19379@redhat.com>
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Subject: Re: [Qemu-devel] [RFC-v2 1/6] msix: Work-around for vhost-scsi with
 KVM in-kernel MSI injection
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, kvm-devel <kvm@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org>, "Nicholas A. Bellinger" <nab@linux-iscsi.org>, Zhi Yong Wu <wuzhy@cn.ibm.com>, Anthony Liguori <aliguori@linux.vnet.ibm.com>, target-devel <target-devel@vger.kernel.org>, Hannes Reinecke <hare@suse.de>, Paolo Bonzini <pbonzini@redhat.com>, lf-virt <virtualization@lists.linux-foundation.org>, Christoph Hellwig <hch@lst.de>

On Mon, Aug 13, 2012 at 02:06:10PM +0200, Jan Kiszka wrote:
> On 2012-08-13 10:35, Nicholas A. Bellinger wrote:
> > From: Nicholas Bellinger <nab@linux-iscsi.org>
> > 
> > This is required to get past the following assert with:
> > 
> > commit 1523ed9e1d46b0b54540049d491475ccac7e6421
> > Author: Jan Kiszka <jan.kiszka@siemens.com>
> > Date:   Thu May 17 10:32:39 2012 -0300
> > 
> >     virtio/vhost: Add support for KVM in-kernel MSI injection
> > 
> > Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
> > Cc: Jan Kiszka <jan.kiszka@siemens.com>
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Anthony Liguori <aliguori@us.ibm.com>
> > Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
> > ---
> >  hw/msix.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/hw/msix.c b/hw/msix.c
> > index 800fc32..c1e6dc3 100644
> > --- a/hw/msix.c
> > +++ b/hw/msix.c
> > @@ -544,6 +544,9 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
> >  {
> >      int vector;
> >  
> > +    if (!dev->msix_vector_use_notifier && !dev->msix_vector_release_notifier)
> > +        return;
> > +
> >      assert(dev->msix_vector_use_notifier &&
> >             dev->msix_vector_release_notifier);
> >  
> > 
> 
> I think to remember pointing out that there is a bug somewhere in the
> reset code which deactivates a non-active vhost instance, no?
> 
> Jan

Could not find it. Could you dig it up pls?

> -- 
> Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
> Corporate Competence Center Embedded Linux