From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 30 Jul 2008 23:22:07 +0900 Subject: Re: [PATCH] reserved-ram for pci-passthrough without VT-d capable hardware From: FUJITA Tomonori In-Reply-To: <20080730135846.GB11494@duo.random> References: <20080729131735.GM30344@one.firstfloor.org> <200807301150.44266.amit.shah@qumranet.com> <20080730135846.GB11494@duo.random> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20080730232028R.tomof@acm.org> Sender: owner-linux-mm@kvack.org Return-Path: To: andrea@qumranet.com Cc: amit.shah@qumranet.com, andi@firstfloor.org, benami@il.ibm.com, avi@qumranet.com, akpm@linux-foundation.org, kvm@vger.kernel.org, aliguori@us.ibm.com, allen.m.kay@intel.com, muli@il.ibm.com, linux-mm@kvack.org, tglx@linutronix.de, mingo@elte.hu List-ID: On Wed, 30 Jul 2008 15:58:46 +0200 Andrea Arcangeli wrote: > On Wed, Jul 30, 2008 at 11:50:43AM +0530, Amit Shah wrote: > > * On Tuesday 29 July 2008 18:47:35 Andi Kleen wrote: > > > > I'm not so interested to go there right now, because while this code > > > > is useful right now because the majority of systems out there lacks > > > > VT-d/iommu, I suspect this code could be nuked in the long > > > > run when all systems will ship with that, which is why I kept it all > > > > > > Actually at least on Intel platforms and if you exclude the lowest end > > > VT-d is shipping universally for quite some time now. If you > > > buy a Intel box today or bought it in the last year the chances are pretty > > > high that it has VT-d support. > > > > I think you mean VT-x, which is virtualization extensions for the x86 > > architecture. VT-d is virtualization extensions for devices (IOMMU). > > I think Andi understood VT-d right but even if he was right that every > reader of this email that is buying a new VT-x system today is also > almost guaranteed to get a VT-d motherboard (which I disagree unless > you buy some really expensive toy), there are current large > installations of VT-x systems that lacks VT-d and that with recent > current dual/quadcore cpus are very fast and will be used for the next > couple of years and they will not upgrade just the motherboard to use > pci-passthrough. Today, very inexpensive desktops (for example, Dell OptiPlex 755) have VT-d support. -- 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