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From ed71d0c46408c9fdf4df93ddc4d0610f0b039696 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 13:57:39 +0100
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Subject: [PATCH 22/24] s390x/pci: Unplug remaining requested devices on
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pcihost reset
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20190417135741.25297-23-cohuck@redhat.com>
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Patchwork-id: 85805
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 22/24] s390x/pci: Unplug remaining requested devices on pcihost reset
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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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When resetting the guest we should unplug and remove all devices that
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are still pending.
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With this patch, the requested device will be unplugged on reboot
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(S390_RESET_EXTERNAL and S390_RESET_REIPL, which reset the pcihost bridge
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via qemu_devices_reset()).
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This approach is similar to what's done for acpi PCI hotplug in
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acpi_pcihp_reset() -> acpi_pcihp_update() ->
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acpi_pcihp_update_hotplug_bus() -> acpi_pcihp_eject_slot().
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s390_pci_generate_plug_event()'s will still be generated, I guess this
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is not an issue. The same thing would happen right now when unplugging
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a device just before starting the guest.
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20190130155733.32742-7-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 2313a88fe68cb970532ba1641ffc35c848daae86)
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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 | 15 +++++++++++++++
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1 file changed, 15 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 1ba7873..383b3e7 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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@@ -1097,6 +1097,21 @@ 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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+
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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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--
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1.8.3.1
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