Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932204AbXKHXvO (ORCPT ); Thu, 8 Nov 2007 18:51:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763420AbXKHXvA (ORCPT ); Thu, 8 Nov 2007 18:51:00 -0500 Received: from nf-out-0910.google.com ([64.233.182.188]:27710 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762060AbXKHXu7 (ORCPT ); Thu, 8 Nov 2007 18:50:59 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:reply-to:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding:from; b=rh0CN9YXjBCfXJ12Sej5Vtt1FjueRymdmva0VuC32f2WB2hr28VZ4i7IDuJP9N0eWoCy97hEBdYw7Mwxau1NC6iGSIzVAIqj7ncdebX9v/eywzSwpZ0egvtaeYpwTkdongXTdcaaZQBL/kV/gSUAVXlW2zCsuWmzdDulEP8eSTk= Message-ID: <47339F20.6010602@qumranet.com> Date: Fri, 09 Nov 2007 01:43:28 +0200 Reply-To: dor.laor@qumranet.com User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Anthony Liguori CC: Avi Kivity , Rusty Russell , virtualization@lists.osdl.org, linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net Subject: Re: [kvm-devel] [PATCH 3/3] virtio PCI device References: <11944899922822-git-send-email-aliguori@us.ibm.com> <11944900141678-git-send-email-aliguori@us.ibm.com> <11944900152750-git-send-email-aliguori@us.ibm.com> <11944900163817-git-send-email-aliguori@us.ibm.com> <4732A8E5.6090307@qumranet.com> <47331531.8070709@us.ibm.com> In-Reply-To: <47331531.8070709@us.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit From: Dor Laor Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1551 Lines: 52 Anthony Liguori wrote: > Avi Kivity wrote: > >> Anthony Liguori wrote: >> >> >>> This is a PCI device that implements a transport for virtio. It allows virtio >>> devices to be used by QEMU based VMMs like KVM or Xen. >>> >>> >>> >>> >> Didn't see support for dma. >> > > Not sure what you're expecting there. Using dma_ops in virtio_ring? > > >> I think that with Amit's pvdma patches you >> can support dma-capable devices as well without too much fuss. >> >> > > What is the use case you're thinking of? A semi-paravirt driver that > does dma directly to a device? > > Regards, > > Anthony Liguori > > You would also lose performance since pv-dma will trigger an exit for each virtio io while virtio kicks the hypervisor after several IOs were queued. > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > kvm-devel mailing list > kvm-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/kvm-devel > > - 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/