From ed71d0c46408c9fdf4df93ddc4d0610f0b039696 Mon Sep 17 00:00:00 2001
From: Cornelia Huck <cohuck@redhat.com>
Date: Wed, 17 Apr 2019 13:57:39 +0100
Subject: [PATCH 22/24] s390x/pci: Unplug remaining requested devices on
 pcihost reset

RH-Author: Cornelia Huck <cohuck@redhat.com>
Message-id: <20190417135741.25297-23-cohuck@redhat.com>
Patchwork-id: 85805
O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 22/24] s390x/pci: Unplug remaining requested devices on pcihost reset
Bugzilla: 1699070
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Jens Freimann <jfreimann@redhat.com>

From: David Hildenbrand <david@redhat.com>

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>
(cherry picked from commit 2313a88fe68cb970532ba1641ffc35c848daae86)
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/s390x/s390-pci-bus.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 1ba7873..383b3e7 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -1097,6 +1097,21 @@ static void s390_pcihost_reset(DeviceState *dev)
 {
     S390pciState *s = S390_PCI_HOST_BRIDGE(dev);
     PCIBus *bus = s->parent_obj.bus;
+    S390PCIBusDevice *pbdev, *next;
+
+    /* Process all pending unplug requests */
+    QTAILQ_FOREACH_SAFE(pbdev, &s->zpci_devs, link, next) {
+        if (pbdev->unplug_requested) {
+            if (pbdev->summary_ind) {
+                pci_dereg_irqs(pbdev);
+            }
+            if (pbdev->iommu->enabled) {
+                pci_dereg_ioat(pbdev->iommu);
+            }
+            pbdev->state = ZPCI_FS_STANDBY;
+            s390_pci_perform_unplug(pbdev);
+        }
+    }
 
     /*
      * When resetting a PCI bridge, the assigned numbers are set to 0. So
-- 
1.8.3.1