On Thu, Oct 08, 2015 at 07:19:13AM +0300, Gleb Natapov wrote:
> Well
> the alternative is to add /dev/vfio/nommu like you've said, but what
> would be the difference between this and uio eludes me.
Are you familiar with vfio that you ask such a question?
Here's the vfio pci code:
$ wc -l drivers/vfio/pci/*
27 drivers/vfio/pci/Kconfig
4 drivers/vfio/pci/Makefile
1217 drivers/vfio/pci/vfio_pci.c
1602 drivers/vfio/pci/vfio_pci_config.c
675 drivers/vfio/pci/vfio_pci_intrs.c
92 drivers/vfio/pci/vfio_pci_private.h
238 drivers/vfio/pci/vfio_pci_rdwr.c
3855 total
There's some code dealing with iommu groups in
drivers/vfio/pci/vfio_pci.c,
but most of it is validating input and
presenting a consistent interface to userspace.
This is exactly what's missing here.
There's also drivers/vfio/virqfd.c which deals
with sending interrupts over eventfds correctly.
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