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From e4631c00d8e9ee3608ef3196cbe8bec4841ee988 Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Wed, 8 Jan 2020 15:04:57 +0000
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Subject: [PATCH 2/5] vfio/pci: Don't remove irqchip notifier if not registered
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RH-Author: Peter Xu <peterx@redhat.com>
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Message-id: <20200108150457.12324-2-peterx@redhat.com>
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Patchwork-id: 93291
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 1/1] vfio/pci: Don't remove irqchip notifier if not registered
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Bugzilla: 1782678
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RH-Acked-by: Alex Williamson <alex.williamson@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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The kvm irqchip notifier is only registered if the device supports
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INTx, however it's unconditionally removed. If the assigned device
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does not support INTx, this will cause QEMU to crash when unplugging
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the device from the system. Change it to conditionally remove the
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notifier only if the notify hook is setup.
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CC: Eduardo Habkost <ehabkost@redhat.com>
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CC: David Gibson <david@gibson.dropbear.id.au>
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CC: Alex Williamson <alex.williamson@redhat.com>
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Cc: qemu-stable@nongnu.org # v4.2
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Reported-by: yanghliu@redhat.com
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Debugged-by: Eduardo Habkost <ehabkost@redhat.com>
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Fixes: c5478fea27ac ("vfio/pci: Respond to KVM irqchip change notifier")
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1782678
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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Reviewed-by: Greg Kurz <groug@kaod.org>
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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(cherry picked from commit 0446f8121723b134ca1d1ed0b73e96d4a0a8689d)
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Signed-off-by: Peter Xu <peterx@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/vfio/pci.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
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index 309535f..d717520 100644
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--- a/hw/vfio/pci.c
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+++ b/hw/vfio/pci.c
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@@ -3100,7 +3100,9 @@ static void vfio_exitfn(PCIDevice *pdev)
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vfio_unregister_req_notifier(vdev);
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vfio_unregister_err_notifier(vdev);
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pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
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- kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier);
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+ if (vdev->irqchip_change_notifier.notify) {
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+ kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier);
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+ }
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vfio_disable_interrupts(vdev);
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if (vdev->intx.mmap_timer) {
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timer_free(vdev->intx.mmap_timer);
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--
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1.8.3.1
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