s390x/pci: Unplug remaining requested devices on pcihost reset
When resetting the guest we should unplug and remove all devices that are still pending. With this patch, the requested device will be unplugged on reboot (S390_RESET_EXTERNAL and S390_RESET_REIPL, which reset the pcihost bridge via qemu_devices_reset()). This approach is similar to what's done for acpi PCI hotplug in acpi_pcihp_reset() -> acpi_pcihp_update() -> acpi_pcihp_update_hotplug_bus() -> acpi_pcihp_eject_slot(). s390_pci_generate_plug_event()'s will still be generated, I guess this is not an issue. The same thing would happen right now when unplugging a device just before starting the guest. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20190130155733.32742-7-david@redhat.com> Reviewed-by: Collin Walling <walling@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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@ -1093,6 +1093,21 @@ static void s390_pcihost_reset(DeviceState *dev)
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{
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S390pciState *s = S390_PCI_HOST_BRIDGE(dev);
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PCIBus *bus = s->parent_obj.bus;
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S390PCIBusDevice *pbdev, *next;
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/* Process all pending unplug requests */
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QTAILQ_FOREACH_SAFE(pbdev, &s->zpci_devs, link, next) {
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if (pbdev->unplug_requested) {
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if (pbdev->summary_ind) {
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pci_dereg_irqs(pbdev);
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}
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if (pbdev->iommu->enabled) {
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pci_dereg_ioat(pbdev->iommu);
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}
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pbdev->state = ZPCI_FS_STANDBY;
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s390_pci_perform_unplug(pbdev);
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}
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}
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/*
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* When resetting a PCI bridge, the assigned numbers are set to 0. So
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