Re: [libvirt] [RFC PATCH 00/28] Enable multifunction pci hotplug
On Wed, Mar 14, 2018 at 10:44:30PM +0530, Shivaprasad G Bhat wrote:
Hi All,
I have revisited/rewritten my previously posted patches. Here is
the RFC. Since this patchset is a complete rewrite, I am starting
with v1 here.
The semantics is as discussed before
https://www.redhat.com/archives/libvir-list/2016-April/msg01057.html
As I went on to refactor the code to support multifunction virtio devices,
I realised the abort/cleanup path would be a nightmare there, in case of
failures. So, dropped that attempt. The current RFC limits to the real
practical use cases of Multifunction PCI hostdevices. All new test code
to support multifunction PCI hostdevices and test cases are added to
prove the functionality.
I guess I'm not really understanding the use case here. With SRIOV
devices, you can already choose between assigning either the physical
function (which gives the guest access to all virtual functions), or
to assign an arbitrary set of individiual functions to various guests.
Why do we need to be able to list many <hostdev> at the same time
when hotplugging to assign multiple functions.
Basically can you provide a full description of the problem you are
trying to solve and why existing functionality isn't sufficient.
Regards,
Daniel
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