Re: [virtio-dev] [PATCH 0/1] Add "Group Identifier" to virtio PCI capabilities.

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jun 01, 2018 at 12:01:26PM -0500, Venu Busireddy wrote:
> On 2018-06-01 18:42:06 +0300, Michael S. Tsirkin wrote:
> > On Wed, May 23, 2018 at 11:16:12AM -0400, Venu Busireddy wrote:
> > > During live migration involving passthrough devices, the guest needs
> > > to know which virtio device will be a fail-over device for a given
> > > passthrough device.
> > > 
> > > Extending the virtio specification with a new "Group Identifier"
> > > capability allows qemu to set up the grouping at the time the guest
> > > is created. The "Group Identifier" can be as simple as a number, or an
> > > UUID. The driver can use the group identifier to pair the virtio device
> > > with the passthrough device. The passthrough device can contain the
> > > group identifier in the PCIe bridge to which it is attached.
> > > 
> > > Venu Busireddy (1):
> > >   Add "Group Identifier" to virtio PCI capabilities.
> > > 
> > >  content.tex | 43 +++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 43 insertions(+)
> > 
> > Is this a PCI thing, or can this somehow be used with non-PCI
> 
> This is applicable to all virtio PCI devices, but not to non-PCI
> devices.
> 
> > devices? If PCI, we can just add a PCI UUID capability to
> > virtio without need to worry about the spec.
> 
> What is a "PCI UUID capability?" "PCI Local Bus Specification
> Revision 3.0, Appendix H" does not list any such capability.
> 
> Regards,
> 
> Venu

Sorry that I'm unclear. What I meant is the
PCI Express serial number capability (0003h).

-- 
MST

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