Messages in this thread | | | From | "Tian, Kevin" <> | Subject | RE: [PATCH 2/7] vfio/pci: Lock external INTx masking ops | Date | Thu, 7 Mar 2024 08:37:53 +0000 |
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> From: Alex Williamson <alex.williamson@redhat.com> > Sent: Thursday, March 7, 2024 5:15 AM > > Mask operations through config space changes to DisINTx may race INTx > configuration changes via ioctl. Create wrappers that add locking for > paths outside of the core interrupt code. > > In particular, irq_type is updated holding igate, therefore testing > is_intx() requires holding igate. For example clearing DisINTx from > config space can otherwise race changes of the interrupt configuration. >
Looks the suspend path still checks irq_type w/o holding igate:
vdev->pm_intx_masked = ((vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX) && vfio_pci_intx_mask(vdev));
Is it with assumption that no change of configuration is possible at that point?
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