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    Subject[PATCH v3 0/3] genirq/vfio: Introduce update_irq_devid and optimize VFIO irq ops
    Date
    Currently, VFIO takes a lot of free-then-request-irq actions whenever
    a VM (with device passthru via VFIO) sets irq affinity or mask/unmask
    irq. Those actions only change the cookie data of irqaction or even
    change nothing. The free-then-request-irq not only adds more latency,
    but also increases the risk of losing interrupt, which may lead to a
    VM hung forever in waiting for IO completion

    This patchset solved the issue by:
    Patch 2 introduces update_irq_devid to only update dev_id of irqaction
    Patch 3 make use of update_irq_devid and optimize irq operations in VFIO

    changes from v2:
    - reformat to avoid quoted string split across lines and etc.

    changes from v1:
    - add Patch 1 to enhance error recovery etc. in free irq per tglx's comments
    - enhance error recovery code and debugging info in update_irq_devid
    - use __must_check in external referencing of update_irq_devid
    - use EXPORT_SYMBOL_GPL for update_irq_devid
    - reformat code of patch 3 for better readability

    Ben Luo (3):
    genirq: enhance error recovery code in free irq
    genirq: introduce update_irq_devid()
    vfio_pci: make use of update_irq_devid and optimize irq ops

    drivers/vfio/pci/vfio_pci_intrs.c | 101 +++++++++++++++++++++-------------
    include/linux/interrupt.h | 3 ++
    kernel/irq/manage.c | 110 +++++++++++++++++++++++++++++++++-----
    3 files changed, 164 insertions(+), 50 deletions(-)

    --
    1.8.3.1

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