Re: [PATCH] qemu: Release <memory/> device address on failed hotplug

A few commits back I've introduced new 'virtio-pmem' <memory/> device. Since it's virtio it goes onto PCI bus. Therefore, on hotplug new PCI address is generated (or provided one is reserved). However, if hotplug fails (for whatever reason) the address needs to be released. This is different to 'dimm' type of address because for that type we don't keep a map of used slots rather generate one on each address assign request. The map is then thrown away. But for PCI addresses we keep internal state and thus has to keep it updated. Therefore, this new qemuDomainReleaseMemoryDeviceSlot() function is NOP for those models which use 'dimm' address type ('dimm' and 'nvdimm'). While I'm at it, let's release the address in case of hot unplug. Not that is supported (any such attempt fails with the following error: "virtio based memory devices cannot be unplugged" But if QEMU ever implements hot unplug then we don't have to remember to fix our code. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_domain_address.c | 23 +++++++++++++++++++++++ src/qemu/qemu_domain_address.h | 3 +++ src/qemu/qemu_hotplug.c | 6 ++++++ 3 files changed, 32 insertions(+)