55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
From 22e8d7076800d7c62e41e8c69fc01444cf00d451 Mon Sep 17 00:00:00 2001
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From: jipengfei <jipengfei_yewu@cmss.chinamobile.com>
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Date: Fri, 30 Jun 2023 21:05:23 +0800
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Subject: [PATCH] vfio/pci: Fix a segfault in vfio_realize
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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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The kvm irqchip notifier is only registered if the device supports
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INTx, however it's unconditionally removed in vfio realize error
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path. If the assigned device does not support INTx, this will cause
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QEMU to crash when vfio realize fails. Change it to conditionally
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remove the notifier only if the notify hook is setup.
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Before fix:
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(qemu) device_add vfio-pci,host=81:11.1,id=vfio1,bus=root1,xres=1
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Connection closed by foreign host.
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After fix:
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(qemu) device_add vfio-pci,host=81:11.1,id=vfio1,bus=root1,xres=1
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Error: vfio 0000:81:11.1: xres and yres properties require display=on
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(qemu)
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Fixes: c5478fea27ac ("vfio/pci: Respond to KVM irqchip change notifier")
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cheery-pick from 357bd7932a136613d700ee8bc83e9165f059d1f7
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Signed-off-by: jipengfei_yewu <jipengfei_yewu@cmss.chinamobile.com>
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Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Reviewed-by: Cédric Le Goater <clg@redhat.com>
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Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
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Signed-off-by: Cédric Le Goater <clg@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 7b45353ce2..b085389ff8 100644
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--- a/hw/vfio/pci.c
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+++ b/hw/vfio/pci.c
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@@ -3112,7 +3112,9 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
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out_deregister:
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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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out_teardown:
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vfio_teardown_msi(vdev);
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vfio_bars_exit(vdev);
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--
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2.41.0.windows.1
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