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[Qemu-devel] [PATCH v2 3/6] s390x/pci: Warn when adding PCI devices with

From: David Hildenbrand
Subject: [Qemu-devel] [PATCH v2 3/6] s390x/pci: Warn when adding PCI devices without the 'zpci' feature
Date: Wed, 30 Jan 2019 16:57:30 +0100

We decided to always create the PCI host bridge, even if 'zpci' is not
enabled (due to migration compatibility). This however right now allows
to add zPCI/PCI devices to a VM although the guest will never actually see
them, confusing people that are using a simple CPU model that has no
'zpci' enabled - "Why isn't this working" (David Hildenbrand)

Let's check for 'zpci' and at least print a warning that this will not
work as expected. We could also bail out, however that might break
existing QEMU commandlines.

Reviewed-by: Thomas Huth <address@hidden>
Signed-off-by: David Hildenbrand <address@hidden>
 hw/s390x/s390-pci-bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 9b5c5fff60..2efd9186c2 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -826,6 +826,11 @@ static void s390_pcihost_pre_plug(HotplugHandler 
*hotplug_dev, DeviceState *dev,
     S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev);
+    if (!s390_has_feat(S390_FEAT_ZPCI)) {
+        warn_report("PCI/zPCI device without the 'zpci' CPU feature."
+                    " The guest will not be able to see/use this device");
+    }
     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         PCIDevice *pdev = PCI_DEVICE(dev);

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