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From 5bd57d8ac3a4e75337eae81a3623b4dc2b417e2f Mon Sep 17 00:00:00 2001
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From: Matthew Rosato <mjrosato@linux.ibm.com>
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Date: Fri, 2 Sep 2022 13:27:33 -0400
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Subject: [PATCH 08/42] s390x/pci: don't fence interpreted devices without
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MSI-X
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 226: s390: Enhanced Interpretation for PCI Functions and Secure Execution guest dump
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RH-Bugzilla: 1664378 2043909
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
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RH-Commit: [8/41] 52bad4368e9494c43133338b386dc0cc159aeedc
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Lack of MSI-X support is not an issue for interpreted passthrough
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devices, so let's let these in. This will allow, for example, ISM
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devices to be passed through -- but only when interpretation is
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available and being used.
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Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
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Message-Id: <20220902172737.170349-5-mjrosato@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit 15d0e7942d3b31ff71d8e0e8cec3a8203214f19b)
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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hw/s390x/s390-pci-bus.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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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 18bfae0465..07c7c155e3 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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@@ -881,6 +881,10 @@ static int s390_pci_msix_init(S390PCIBusDevice *pbdev)
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static void s390_pci_msix_free(S390PCIBusDevice *pbdev)
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{
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+ if (pbdev->msix.entries == 0) {
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+ return;
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+ }
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+
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memory_region_del_subregion(&pbdev->iommu->mr, &pbdev->msix_notify_mr);
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object_unparent(OBJECT(&pbdev->msix_notify_mr));
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}
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@@ -1093,7 +1097,7 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
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pbdev->interp = false;
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}
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- if (s390_pci_msix_init(pbdev)) {
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+ if (s390_pci_msix_init(pbdev) && !pbdev->interp) {
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error_setg(errp, "MSI-X support is mandatory "
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"in the S390 architecture");
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return;
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--
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2.37.3
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