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

[Siwei Liu <loseweigh@gmail.com>]

On Fri, Jun 1, 2018 at 1:03 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
> 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).

Then what's on legacy PCI bridge device with i440fx chipset? VPD capability?

>
> --
> MST
>
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