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Subject[PATCH v3 0/3] genirq/vfio: Introduce update_irq_devid and optimize VFIO irq ops
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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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