On Wed, Apr 03, 2019 at 03:32:09PM +0800, Heyi Guo wrote: > Hi folks, > > In physical world, a PCIe switch including one upstream port and several > downstream ports is a single physical device, however we treat each port as a > device in qemu world. In qemu docs/pcie.txt, we have below statements: > > Line 230: Be aware that PCI Express Downstream Ports can't be hot-plugged into > Line 231: an existing PCI Express Upstream Port. > > To my understanding, it implies PCIe downstream ports *can* be hot-plugged > into something which is not an existing upstream port. If it is true, how can > we do that? AFAIK monitor command device_add can only add one device at a > time. > > Please help to show the truth. > > Thanks, > > Heyi >
afaik they can only be plugged into upstearm ports with or without hotplug. -- mst
