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

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Message-ID: <20151006223202.66ab0b87@samsung9>
Date:	Tue, 6 Oct 2015 22:32:02 +0100
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	Avi Kivity <avi@...lladb.com>,
	"Michael S. Tsirkin" <mst@...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, alexander.duyck@...il.com
Subject: Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

On Tue, 06 Oct 2015 12:51:20 -0600
Alex Williamson <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).
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