vfio/pci: Implement ioeventfd thread handler for contended memory lock

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The ioeventfd is called under spinlock with interrupts disabled,
therefore if the memory lock is contended defer code that might
sleep to a thread context.

Fixes: bc93b9ae01 ("vfio-pci: Avoid recursive read-lock usage")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209253#c1
Reported-by: Ian Pilcher <arequipeno@gmail.com>
Tested-by: Ian Pilcher <arequipeno@gmail.com>
Tested-by: Justin Gatzen <justin.gatzen@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Alex Williamson 2020-11-02 15:02:00 -07:00

parent 8e91cb3812

commit 38565c93c8

1 changed files with 35 additions and 8 deletions

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drivers/vfio/pci/vfio_pci_rdwr.c

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