On 9/12/2023 3:43 PM, Parav Pandit wrote:
From: Zhu, Lingshan <lingshan....@intel.com>
Sent: Tuesday, September 12, 2023 1:06 PM
On 9/12/2023 2:52 PM, Parav Pandit wrote:
From: Zhu, Lingshan <lingshan....@intel.com>
Sent: Tuesday, September 12, 2023 12:13 PM Why need P2P for Live
Migration?
A peer device may be accessing the virtio device. Hence first all the devices to
be stopped like [1] allowing them to accept driver notifications from the peer
device.
Once all the devices are stopped, than each device to be freeze to not do any
device context updates. At this point the final device context can be read by
the
owner driver.
Is it beyond the spec? Nvidia specific use case and not related to virtio live
migration?
Not at all Nvidia specific.
And not all at all beyond the specification.
PCI transport is probably by far most common transport of virtio.
And hence, spec proposed in [1] covers it.
It is the base line implementation of leading OS such as Linux kernel.
Decade mature stack like vfio recommends support for p2p as base line without
which multiple devices migration can fail as hypervisor has no knowledge if two
devices are interacting or not.
[1] https://lists.oasis-open.org/archives/virtio-comment/202309/msg00071.html
still, why do you think P2P is a concern of live migration? Or why do
you think Live Migration should implement special support for P2P?
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