| Date | Tue, 8 Aug 2023 12:20:29 +0100 | From | Andrew Cooper <> | Subject | Re: [patch 00/53] x86/topology: The final installment |
| |
On 08/08/2023 8:40 am, Juergen Gross wrote: > Tested on an Intel system with Xen: > > - PV dom0 is working fine. I couldn't test physical cpu hotplug, but > removing > and then re-adding vcpus to dom0 worked.
It turns out that physical CPU hotplug with XenPV is broken in at least two ways.
It's dom0 (not Xen) that gets the hot-unplug event, after which the Xen code in Linux succumbs to a preempt-check failure while trying to offline the vCPU that aliases the pCPU wanting to go offline.
~Andrew
|