From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: VT-d support for device assignment Date: Fri, 22 Aug 2008 21:37:16 +0300 Message-ID: <48AF075C.7050904@qumranet.com> References: <1219389054-15332-1-git-send-email-amit.shah@qumranet.com> <200808222102.33596.amit.shah@qumranet.com> <20080822182948.GJ6885@il.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Amit Shah , Byron Stanoszek , kvm@vger.kernel.org To: Muli Ben-Yehuda Return-path: Received: from il.qumranet.com ([212.179.150.194]:48981 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753400AbYHVShS (ORCPT ); Fri, 22 Aug 2008 14:37:18 -0400 In-Reply-To: <20080822182948.GJ6885@il.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: Muli Ben-Yehuda wrote: > On Fri, Aug 22, 2008 at 09:02:33PM +0530, Amit Shah wrote: > > >> All the PCI accesses happen from the userspace components in qemu; >> it's certainly possible to log activity. >> > > Actually, with direct-mmio we bypass QEMU and get a nice boost in > performance, and it should be possible to bypass QEMU for (most) PIO's > too. > Since there is no pio remapping, there's no way to ensure there's a free pio range where the guest maps its ports. Luckily pio is out of fashion these days. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.