[RFC,v3,0/5] util/vfio-helpers: Add support for multiple IRQs

Message

Philippe Mathieu-Daudé Aug. 18, 2020, 4:45 p.m. UTC

This series intends to setup the VFIO helper to allow
binding notifiers on different IRQs.

For the NVMe use case, we only care about MSIX interrupts.
To not disrupt other users, introduce the qemu_vfio_pci_init_msix_irqs
function to initialize multiple MSIX IRQs and attach eventfd to
them.

Since RFC v2:
- new patch to report vfio-helpers is not supported on AA64/POWER

(NVMe block driver series will follow).

Based-on: <[e-mail]>
"block/nvme: Various cleanups required to use multiple queues"
https://www.mail-archive.com/[e-mail]/msg729395.html

Philippe Mathieu-Daudé (5):
  block/nvme: Use an array of EventNotifier
  util/vfio-helpers: Report error on unsupported host architectures
  util/vfio-helpers: Store eventfd using int32_t type
  util/vfio-helpers: Introduce qemu_vfio_pci_init_msix_irqs()
  block/nvme: Use qemu_vfio_pci_init_msix_irqs() to initialize our IRQ

 include/qemu/vfio-helpers.h |  2 +
 block/nvme.c                | 30 +++++++++-----
 util/vfio-helpers.c         | 83 +++++++++++++++++++++++++++++++++++--
 3 files changed, 101 insertions(+), 14 deletions(-)