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

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Date:	Wed, 7 Oct 2015 10:57:12 +0300
From:	Vlad Zolotarov <vladz@...udius-systems.com>
To:	Stephen Hemminger <stephen@...workplumber.org>,
	Alex Williamson <alex.williamson@...hat.com>
Cc:	Avi Kivity <avi@...lladb.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, hjk@...sjkoch.de,
	Jonathan Corbet <corbet@....net>,
	"Bruce.Richardson@...el.com" <bruce.richardson@...el.com>,
	avi@...udius-systems.com, gleb@...udius-systems.com,
	Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support



On 10/07/15 00:58, Stephen Hemminger wrote:
> Go ahead and submit a seperate taint bit for UIO as a patch.

This patch already does this.

thanks,
vlad

>
>
> On Tue, Oct 6, 2015 at 10:41 PM, Alex Williamson 
> <alex.williamson@...hat.com <mailto:alex.williamson@...hat.com>> wrote:
>
>     On Tue, 2015-10-06 at 22:32 +0100, Stephen Hemminger wrote:
>     > On Tue, 06 Oct 2015 12:51:20 -0600
>     > Alex Williamson <alex.williamson@...hat.com
>     <mailto:alex.williamson@...hat.com>> wrote:
>     >
>     > > Of course this is entirely unsafe and this no-iommu driver
>     should taint
>     > > the kernel, but it at least standardizes on one userspace API
>     and you're
>     > > already doing completely unsafe things with uio.  vfio should be
>     > > enlightened at least to the point that it allows only
>     privileged users
>     > > access to devices under such a (lack of) iommu
>     >
>     > I agree with the design, but not with the taint argument.
>     > (Unless you want to taint any and all use of UIO drivers which can
>     >  already do this).
>
>     Yes, actually, if the bus master bit gets enabled all bets are off.  I
>     don't see how that leaves a supportable kernel, so we might as well
>     taint it.  Isn't this exactly why we taint for proprietary drivers, we
>     have no idea what it has mucked with in kernel space.  This just moves
>     the proprietary driver out to userspace without an iommu to
>     protect the
>     host.  Thanks,
>
>     Alex
>
>

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