linux-kernel - Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers

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Message-ID: <20100602165321.GU8301@sequoia.sous-sol.org>
Date:	Wed, 2 Jun 2010 09:53:21 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Joerg Roedel <joro@...tes.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, Tom Lyon <pugs@...co.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	chrisw@...s-sol.org, hjk@...utronix.de, gregkh@...e.de,
	aafabbri@...co.com, scofeldm@...co.com
Subject: Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers

* Avi Kivity (avi@...hat.com) wrote:
> The interface would only work for clients which support it: kvm,
> vhost, and iommu/devices with restartable dma.

BTW, there is no such thing as restartable dma.  There is a provision in
new specs (read: no real hardware) that allows a device to request pages
before using them.  So it's akin to demand paging, but the demand is an
explicit request rather than a page fault.

thanks,
-chris
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