linux-kernel - Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

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Date:	Thu, 8 Oct 2015 10:41:53 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gleb Natapov <gleb@...lladb.com>
Cc:	Avi Kivity <avi@...lladb.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Vlad Zolotarov <vladz@...udius-systems.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, hjk@...sjkoch.de, corbet@....net,
	bruce.richardson@...el.com, avi@...udius-systems.com,
	gleb@...udius-systems.com, stephen@...workplumber.org,
	alexander.duyck@...il.com
Subject: Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

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.

-- 
MST
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