linux-kernel - Re: [PATCH 0/2] uio

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Message-ID: <20151001113337-mutt-send-email-mst@redhat.com>
Date:	Thu, 1 Oct 2015 11:36:41 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	hjk@...sjkoch.de, gregkh@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dev@...k.org
Subject: Re: [PATCH 0/2] uio_msi: device driver

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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