60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From 9f13c7165566f442484fa6c335950465ed6a2050 Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Wed, 17 Apr 2019 13:57:38 +0100
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Subject: [PATCH 21/24] s390x/pci: Warn when adding PCI devices without the
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'zpci' feature
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20190417135741.25297-22-cohuck@redhat.com>
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Patchwork-id: 85803
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 21/24] s390x/pci: Warn when adding PCI devices without the 'zpci' feature
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Bugzilla: 1699070
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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From: David Hildenbrand <david@redhat.com>
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We decided to always create the PCI host bridge, even if 'zpci' is not
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enabled (due to migration compatibility). This however right now allows
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to add zPCI/PCI devices to a VM although the guest will never actually see
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them, confusing people that are using a simple CPU model that has no
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'zpci' enabled - "Why isn't this working" (David Hildenbrand)
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Let's check for 'zpci' and at least print a warning that this will not
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work as expected. We could also bail out, however that might break
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existing QEMU commandlines.
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20190130155733.32742-4-david@redhat.com>
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Reviewed-by: Collin Walling <walling@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 703fef6fcf3edcbf169c90b6196fcf88f9e9765a)
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/s390x/s390-pci-bus.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
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index a0f7245..1ba7873 100644
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--- a/hw/s390x/s390-pci-bus.c
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+++ b/hw/s390x/s390-pci-bus.c
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@@ -864,6 +864,12 @@ static void s390_pcihost_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
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{
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S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev);
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+ if (!s390_has_feat(S390_FEAT_ZPCI)) {
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+ warn_report("Plugging a PCI/zPCI device without the 'zpci' CPU "
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+ "feature enabled; the guest will not be able to see/use "
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+ "this device");
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+ }
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+
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if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
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PCIDevice *pdev = PCI_DEVICE(dev);
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--
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1.8.3.1
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