Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755249AbZINQwM (ORCPT ); Mon, 14 Sep 2009 12:52:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751061AbZINQwJ (ORCPT ); Mon, 14 Sep 2009 12:52:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:63401 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750791AbZINQwH (ORCPT ); Mon, 14 Sep 2009 12:52:07 -0400 Date: Mon, 14 Sep 2009 19:47:50 +0300 From: "Michael S. Tsirkin" To: Gregory Haskins Cc: "Ira W. Snyder" , netdev@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@elte.hu, linux-mm@kvack.org, akpm@linux-foundation.org, hpa@zytor.com, Rusty Russell , s.hetze@linux-ag.com Subject: Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server Message-ID: <20090914164750.GB3745@redhat.com> References: <20090827160750.GD23722@redhat.com> <20090903183945.GF28651@ovro.caltech.edu> <20090907101537.GH3031@redhat.com> <20090908172035.GB319@ovro.caltech.edu> <4AAA7415.5080204@gmail.com> <20090913120140.GA31218@redhat.com> <4AAE6A97.7090808@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4AAE6A97.7090808@gmail.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 951 Lines: 29 On Mon, Sep 14, 2009 at 12:08:55PM -0400, Gregory Haskins wrote: > For Ira's example, the addresses would represent a physical address on > the PCI boards, and would follow any kind of relevant rules for > converting a "GPA" to a host accessible address (even if indirectly, via > a dma controller). I don't think limiting addresses to PCI physical addresses will work well. From what I rememeber, Ira's x86 can not initiate burst transactions on PCI, and it's the ppc that initiates all DMA. > > > But we can't let the guest specify physical addresses. > > Agreed. Neither your proposal nor mine operate this way afaict. But this seems to be what Ira needs. > HTH > > Kind Regards, > -Greg > -- 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/