+gerd
On Mon, 8 Nov 2021, Annie.li wrote: > 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. This is sad. > > 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. So we are in soft code freeze for 6.2: https://wiki.qemu.org/Planning/6.2 I am curious about Gerd's comment #10: "The 6.2 rebase should make hotplug work again with the default configuration." Sadly I have not seen any public discussion on what we want to do for the issues with acpi hotplug for bridges in q35.
