From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 1FD076B004F for ; Mon, 14 Sep 2009 12:50:42 -0400 (EDT) Date: Mon, 14 Sep 2009 19:47:50 +0300 From: "Michael S. Tsirkin" 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> Sender: owner-linux-mm@kvack.org 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 List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org