Update:
I've tested q35 guest w/o OVMF, the APCI PCI hot-plugging works well in
q35 guest. Seems this issue only happens in q35 guest w/ OVMF.
Looks that there is already a bug filed against this hotplug issue in
q35 guest w/ OVMF,
https://bugzilla.redhat.com/show_bug.cgi?id=2004829
In this bug, it is recommended to add "-global
ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \" on qemu command for
6.1. However, with this option for 6.1(PCIe native hotplug), there still
are kinds of issues. For example, one of them is the deleted virtio_blk
device still shows in the Device Manager in Windows q35 guest, the
operation of re-scanning new hardware takes forever there. This means
both PCIe native hotplug and ACPI hotplug all have issues in q35 guests.
Per comments in this bug, changes in both OVMF and QEMU are necessary to
support ACPI hot plug in q35 guest. The fixes may likely be available in
QEMU 6.2.0. I am wondering if someone is already working on this?
Thanks
Annie
