xen/pciback: Disable MSI/MSI-X when reseting a device
In cases where the guest is abruptly killed and has not disabled MSI/MSI-X interrupts we want to do it for it. Otherwise when the guest is started up and enables MSI, we would get a WARN() that the device already had been enabled. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -23,6 +23,14 @@ void pciback_reset_device(struct pci_dev *dev)
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/* Disable devices (but not bridges) */
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if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
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#ifdef CONFIG_PCI_MSI
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/* The guest could have been abruptly killed without
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* disabling MSI/MSI-X interrupts.*/
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if (dev->msix_enabled)
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pci_disable_msix(dev);
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if (dev->msi_enabled)
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pci_disable_msi(dev);
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#endif
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pci_disable_device(dev);
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pci_write_config_word(dev, PCI_COMMAND, 0);
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