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70 lines
2.5 KiB
70 lines
2.5 KiB
8 months ago
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From 43236995e8ad336d366b625fb8362046be53fc34 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Mon, 29 Jan 2024 09:46:34 +0100
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Subject: [PATCH] vfio/pci: Clear MSI-X IRQ index always
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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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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 218: vfio/pci: Clear MSI-X IRQ index always
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RH-Jira: RHEL-21293
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Alex Williamson <None>
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RH-Commit: [1/1] b4b587b13c11e350d3e5fcc11ba66a006b25a763 (clegoate/qemu-kvm-c9s)
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JIRA: https://issues.redhat.com/browse/RHEL-21293
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commit d2b668fca5652760b435ce812a743bba03d2f316
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Author: Cédric Le Goater <clg@redhat.com>
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Date: Thu Jan 25 14:27:36 2024 +0100
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vfio/pci: Clear MSI-X IRQ index always
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When doing device assignment of a physical device, MSI-X can be
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enabled with no vectors enabled and this sets the IRQ index to
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VFIO_PCI_MSIX_IRQ_INDEX. However, when MSI-X is disabled, the IRQ
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index is left untouched if no vectors are in use. Then, when INTx
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is enabled, the IRQ index value is considered incompatible (set to
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MSI-X) and VFIO_DEVICE_SET_IRQS fails. QEMU complains with :
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qemu-system-x86_64: vfio 0000:08:00.0: Failed to set up TRIGGER eventfd signaling for interrupt INTX-0: VFIO_DEVICE_SET_IRQS failure: Invalid argument
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To avoid that, unconditionaly clear the IRQ index when MSI-X is
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disabled.
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Buglink: https://issues.redhat.com/browse/RHEL-21293
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Fixes: 5ebffa4e87e7 ("vfio/pci: use an invalid fd to enable MSI-X")
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Cc: Jing Liu <jing2.liu@intel.com>
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Cc: Alex Williamson <alex.williamson@redhat.com>
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Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.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 | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
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index adb7c09367..29bb8067eb 100644
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--- a/hw/vfio/pci.c
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+++ b/hw/vfio/pci.c
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@@ -829,9 +829,11 @@ static void vfio_msix_disable(VFIOPCIDevice *vdev)
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}
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}
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- if (vdev->nr_vectors) {
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- vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX);
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- }
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+ /*
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+ * Always clear MSI-X IRQ index. A PF device could have enabled
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+ * MSI-X with no vectors. See vfio_msix_enable().
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+ */
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+ vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX);
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vfio_msi_disable_common(vdev);
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vfio_intx_enable(vdev, &err);
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--
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2.39.3
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