Re: [PATCH 0/2] uio_msi: device driver

Michael S. Tsirkin
2015-10-01T08:36:48Z

On Wed, Sep 30, 2015 at 03:28:56PM -0700, Stephen Hemminger wrote:
> This is a new UIO device driver to allow supporting MSI-X and MSI devices
> in userspace. It has been used in environments like VMware and older versions
> of QEMU/KVM where no IOMMU support is available.
>
> Stephen Hemminger (2):
>
> *** BLURB HERE ***

I think this needs some more work to make sure
userspace can drive devices without a risk of
crashing the kernel even when there's no IOMMU.

I sent some comments in response to the patch itself.

Please copy me on future versions of this driver.

Thanks!

> Stephen Hemminger (2):
> uio: add support for ioctls
> uio: new driver to support PCI MSI-X
>
> drivers/uio/Kconfig | 9 ++
> drivers/uio/Makefile | 1 +
> drivers/uio/uio.c | 15 ++
> drivers/uio/uio_msi.c | 378 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/uio_driver.h | 3 +
> include/uapi/linux/Kbuild | 1 +
> include/uapi/linux/uio_msi.h | 22 +++
> 7 files changed, 429 insertions(+)
> create mode 100644 drivers/uio/uio_msi.c
> create mode 100644 include/uapi/linux/uio_msi.h
>
> --
> 2.1.4
>
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