From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt Date: Thu, 23 Aug 2007 04:34:04 +0200 Message-ID: <20070823023404.GL8058@bingen.suse.de> References: <46CBC842.4070100@vmware.com> <46CCB088.8070606@goop.org> <46CCB56F.8090308@superbug.co.uk> <20070822222036.GD3672@sequoia.sous-sol.org> <46CCB8BA.6060007@superbug.demon.co.uk> <46CCC361.6020600@goop.org> <20070823004700.GR2642@bingen.suse.de> <46CCD707.1090009@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <46CCD707.1090009@goop.org> Sender: linux-kernel-owner@vger.kernel.org To: Jeremy Fitzhardinge Cc: Andi Kleen , James Courtier-Dutton , Andrew Morton , Linux Kernel Mailing List , Chris Wright , Virtualization Mailing List List-Id: virtualization@lists.linuxfoundation.org On Wed, Aug 22, 2007 at 05:38:31PM -0700, Jeremy Fitzhardinge wrote: > Andi Kleen wrote: > > On Wed, Aug 22, 2007 at 04:14:41PM -0700, Jeremy Fitzhardinge wrote: > > > >> (which would also have VT, since > >> all new processors do). > >> > > > > Not true unfortunately. The Intel low end parts like Celerons (which > > are actually shipped in very large numbers) don't. Also Intel > > is still shipping some CPUs that don't support it at all, like > > the ULV Centrinos which are based on an older core. > > > > Likely to be missing VT-d too, right? VT-d is chipset functionality. So it depends on the chipset. At least initially the non Intel chipsets and lowend chips are unlikely to get IOMMUs I guess. There might be some exceptions. e.g. the GPU vendors seem to want to to their own IOMMUs, so perhaps graphic devices might have them anyways. -Andi