Hi, > Subject: [Qemu-devel] USB PCI host bus adapter hot plug > > Hi! > > I noticed that QMP's "device_add usb-ehci,id=i2,bus=pci.0" fails on PCI > hotplug. The same for pci-ohci and this is because their initfn() do > "dc->hotpluggable = false". So I removed those and now I can hotplug USB > hosts but none of them is able to actually work: > > root@aiktest-le:~# echo 1 >/sys/bus/pci/rescan > [ 41.143062] ohci-pci 0000:00:01.0: init err (c8700000 0000) > [ 41.143133] ohci-pci 0000:00:01.0: can't start > [ 41.143227] ohci-pci 0000:00:01.0: startup error -75 > [ 41.144202] ohci-pci 0000:00:01.0: init 0000:00:01.0 fail, -75 > > > root@aiktest-le:~# echo 1 >/sys/bus/pci/rescan > [ 43.691067] ehci-pci 0000:00:01.0: can't setup: -110 > [ 43.692424] ehci-pci 0000:00:01.0: init 0000:00:01.0 fail, -110 > > > Why is that? Is QEMU just missing some bits or there is some fundamental > issue which I just do not see? Thanks! > Cc'ing Gerd.
Actually I have post a patch serials for supporting usb host adapter hotplugging, Which has been involved in Gerd's (the USB mantainer) usb-next tree. Please see: https://www.kraxel.org/cgit/qemu/log/?h=rebase/usb-next The function of usb host adapter hotplugging is ok. You are welcome to test it. BTW, What's your guest os type? Best regards, -Gonglei
