Hi All,
A quick set of notes on the discussion on vCPU hotplug.
Great to have Ed join the discussion. If we are going to have further calls on this topic we may want to move the time to be more friendly for the US.
Current status * ACPI spec change via code first route approved. * Kernel patches being reworked / rebased by ARM. Expected to be sent out in 5.19 cycle. * QEMU patches being updated by Huawei. Will do at least some light testing and then push out a public git tree so that others can test - will aim to do this so it aligns with kernel code availability. * Ed (Ampere) gave an update to say they are interested in pushing this forwards ASAP and have customer / OS vendor engagement which will be very useful in moving towards a complete solution, particularly ensuring good test coverage etc.
Noted that current QEMU patches may not cover all corner cases, for example live migration of VMs that have vCPUs hotplugged. Might 'just work' but we haven't tested it yet so probably not.
Given we didn't really add anything on DOE / SPDM over previous calls, I don't plan to send out anything on that topic this time.
Thanks to Joyce for hosting the call. If I noted down anything wrong, or incomplete let the list know.
Jonathan