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45 lines
1.8 KiB
45 lines
1.8 KiB
From b338719eb9908c7dfd493d5ab4a1b0bcc2258d9b Mon Sep 17 00:00:00 2001
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Message-ID: <b338719eb9908c7dfd493d5ab4a1b0bcc2258d9b.1780571166.git.jdenemar@redhat.com>
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Thu, 26 Mar 2026 14:32:36 +0100
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Subject: [PATCH] hypervisor: Call virWaitForDevices() after detaching host
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devices
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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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On systems with selinux enabled starting a VM with managed host device
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using IOMMUFD backend can run into race-condition where both libvirt and
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udev are setting selinux label on /dev/vfio/devices/vfioX device. If
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udev is the last one to set selinux label starting VM fails with:
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error: internal error: QEMU unexpectedly closed the monitor (vm='test'): 2026-03-26T15:47:36.620422Z qemu-kvm: -device {"driver":"vfio-pci","id":"hostdev0","iommufd":"iommufd0","fd":"20","bus":"pci.7","addr":"0x0"}: vfio hostdev0: Failed to add fd 20 to KVM VFIO device: Invalid argument
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We need to wait for udev to finish processing all events.
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit b96ea4db3aabac4790d6e1d53e2f309f5e73efae)
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Resolves: https://redhat.atlassian.net/browse/RHEL-156803
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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---
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src/hypervisor/virhostdev.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/src/hypervisor/virhostdev.c b/src/hypervisor/virhostdev.c
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index 43155ceb6c..981ca4cd20 100644
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--- a/src/hypervisor/virhostdev.c
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+++ b/src/hypervisor/virhostdev.c
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@@ -782,6 +782,9 @@ virHostdevPreparePCIDevicesImpl(virHostdevManager *mgr,
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}
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}
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+ /* Step 2.5: Wait for udev to handle all events for devices. */
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+ virWaitForDevices();
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+
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/* At this point, all devices are attached to the stub driver and have
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* been marked as inactive */
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--
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2.54.0
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