RE: [virtio-comment] Re: [PATCH v1 3/8] device-context: Define the device context fields for device migration

[Parav Pandit <parav@nvidia.com>]

> From: virtio-comment@lists.oasis-open.org <virtio-comment@lists.oasis-
> open.org> On Behalf Of Zhu, Lingshan
> Sent: Monday, October 16, 2023 3:18 PM
> 
> On 10/13/2023 7:54 PM, Parav Pandit wrote:
> >> From: Zhu, Lingshan <lingshan.zhu@intel.com>
> >> Sent: Friday, October 13, 2023 3:14 PM
> >>>>>> How do you transfer the ownership?
> >>>>> An additional ownership deletgation by a new admin command.
> >>>> if you think this can work, do you want to cook a patch to
> >>>> implement this before you submitting this live migration series?
> >>> I answered this already above.
> >> talk is cheap, show me your patch
> > Huh. We presented the infrastructure that migrates, 30+ device types,
> covering device context ideas from Oracle.
> > Covering P2P, supporting device_reset, FLR, dirty page tracking.
> >
> > Please have some respect for other members who covered more ground than
> your series.
> >
> > What more? Apply the same nested concept on the member device as
> Michael suggested, it is nested virtualization maintain exact same semantics.
> > So a VF is mapped as PF to the L1 guest.
> > L1 guest can enable SR-IOV on it, and map one VF to L2 guest.
> >
> > This nested work can be extended in future, once first level nesting is
> covered.
> >
> >> Answer all questions above, if you think a management VF can work,
> >> please show me your patch.
> > The idea evolves from technical debate then pointing fingers like your
> comment.
> >
> > I think a positive discussion with Michael and a pointer to the paper from
> Jason gave a good direction of doing _right_ nesting that follows two principles.
> > a. efficiency property
> > b. equivalence property
> >
> > (c. resource control is natural already)
> >
> > Both apply at VMM and at VM level enabling recursive virtualization, by
> having VF that can act as PF inside the guest.
> >
> > [1] https://dl.acm.org/doi/pdf/10.1145/361011.361073
> Please just show me your patch resolving these opens, how about start from
> defining virito-fs device context and your management VF?
As answered, device context infrastructure is done, per device specific device-context will be defined incrementally.
I will not be including virtio-fs in this series. It will be done incrementally in future utilizing the infrastructure build in this series.