Alex Williamson b68e7fa879 vfio: Fix virqfd release race ...

vfoi-pci supports a mechanism like KVM's irqfd for unmasking an
interrupt through an eventfd.  There are two ways to shutdown this
interface: 1) close the eventfd, 2) ioctl (such as disabling the
interrupt).  Both of these do the release through a workqueue,
which can result in a segfault if two jobs get queued for the same
virqfd.

Fix this by protecting the pointer to these virqfds by a spinlock.
The vfio pci device will therefore no longer have a reference to it
once the release job is queued under lock.  On the ioctl side, we
still flush the workqueue to ensure that any outstanding releases
are completed.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

2012-09-21 10:48:28 -06:00

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Kconfig

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Makefile

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vfio_pci_config.c

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vfio_pci_intrs.c

vfio: Fix virqfd release race

2012-09-21 10:48:28 -06:00

vfio_pci_private.h

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vfio_pci_rdwr.c

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vfio_pci.c

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