Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932838Ab0FBQyB (ORCPT ); Wed, 2 Jun 2010 12:54:01 -0400 Received: from sous-sol.org ([216.99.217.87]:46186 "EHLO sequoia.sous-sol.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932786Ab0FBQx7 (ORCPT ); Wed, 2 Jun 2010 12:53:59 -0400 Date: Wed, 2 Jun 2010 09:53:21 -0700 From: Chris Wright To: Avi Kivity Cc: Joerg Roedel , "Michael S. Tsirkin" , Tom Lyon , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, chrisw@sous-sol.org, hjk@linutronix.de, gregkh@suse.de, aafabbri@cisco.com, scofeldm@cisco.com Subject: Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers Message-ID: <20100602165321.GU8301@sequoia.sous-sol.org> References: <20100531171007.GA6516@redhat.com> <4C04C085.1030107@redhat.com> <20100601095532.GA9178@redhat.com> <4C04E0E0.3070006@redhat.com> <20100601104651.GA9415@redhat.com> <4C050013.2020701@redhat.com> <20100602094527.GD964@8bytes.org> <4C062928.8040003@redhat.com> <20100602100404.GF964@8bytes.org> <4C063ECB.8010706@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4C063ECB.8010706@redhat.com> User-Agent: Mutt/1.5.20 (2009-08-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 676 Lines: 16 * Avi Kivity (avi@redhat.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/