Check for hot plug capability earlier to avoid removing devices attached during the initialization process.
Run qemu with an unattached drive: -drive file=$FILE,if=none,id=drive0 \ -device pcie-root-port,id=rp0,slot=3,bus=pcie.0,hotplug=off Hotplug a block device: device_add virtio-blk-pci,id=blk0,drive=drive0,bus=rp0 If hotplug fails on plug_cb, drive0 will be deleted. Signed-off-by: Julia Suvorova <jus...@redhat.com> --- Hard to say if it's a bug or generally acceptable behaviour, but seems like hotplug_handler_plug should never fail. hw/pci/pcie.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index f50e10b8fb..5b9c022d91 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -407,6 +407,17 @@ static void pcie_cap_slot_plug_common(PCIDevice *hotplug_dev, DeviceState *dev, void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { + PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); + uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; + uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); + + /* Check if hot-plug is disabled on the slot */ + if (dev->hotplugged && (sltcap & PCI_EXP_SLTCAP_HPC) == 0) { + error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'", + DEVICE(hotplug_pdev)->id); + return; + } + pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, errp); } @@ -415,7 +426,6 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, { PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; - uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); PCIDevice *pci_dev = PCI_DEVICE(dev); /* Don't send event when device is enabled during qemu machine creation: @@ -431,13 +441,6 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, return; } - /* Check if hot-plug is disabled on the slot */ - if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) { - error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'", - DEVICE(hotplug_pdev)->id); - return; - } - /* To enable multifunction hot-plug, we just ensure the function * 0 added last. When function 0 is added, we set the sltsta and * inform OS via event notification. -- 2.25.4