From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1HX1mh-0001Ku-Oh for qemu-devel@nongnu.org; Thu, 29 Mar 2007 17:03:51 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1HX1me-0001Ki-Go for qemu-devel@nongnu.org; Thu, 29 Mar 2007 17:03:51 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HX1me-0001Kf-Bj for qemu-devel@nongnu.org; Thu, 29 Mar 2007 16:03:48 -0500 Received: from bangui.magic.fr ([195.154.194.245]) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1HX1k1-0005VR-BK for qemu-devel@nongnu.org; Thu, 29 Mar 2007 17:01:05 -0400 Received: from [192.168.0.2] (ppp-36.net-723.magic.fr [80.118.184.36]) by bangui.magic.fr (8.13.1/8.13.1) with ESMTP id l2TL0uTw009943 for ; Thu, 29 Mar 2007 23:00:56 +0200 Subject: Re: [Qemu-devel] QEMU Alpha target From: "J. Mayer" In-Reply-To: <200703291625.51752.paul@codesourcery.com> References: <20070317143730.1befbf94@neuling> <200703291608.26347.paul@codesourcery.com> <20070329151209.GA6635@miranda.arrow> <200703291625.51752.paul@codesourcery.com> Content-Type: text/plain Date: Thu, 29 Mar 2007 23:01:00 +0200 Message-Id: <1175202061.6794.110.camel@rapid> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org On Thu, 2007-03-29 at 16:25 +0100, Paul Brook wrote: > On Thursday 29 March 2007 16:12, Stuart Brady wrote: > > On Thu, Mar 29, 2007 at 04:08:25PM +0100, Paul Brook wrote: > > > > There do seem to be a few people who'd like Alpha emulation for QEMU. > > > > Obviously, you'd want to get dynamic translation working first. :-) > > > > > > > > OTOH, I'm now wondering which archs can support full virtualisation. > > > > > > Depends how you define "full virtualization". If you call kqemu full > > > virtualization then you can do that on pretty much any CPU. > > > > I meant "meeting Popek and Goldberg's virtualisation requirements". > > In that case, I suspect most of them don't. > x86 certainly doesn't. Recent VT/SVM extensions bring it close, but there are > still problems. > PPC and SPARC also have hypervisor extensions, which suggests the conventional > instruction sets don't allow full virtualization. PowerPC is fully virtualisable which is what Mac-On-Linux is supposed to do. But this has a cost. Hypervisor mode seems to exists only to do the same without any performance degradation. -- J. Mayer Never organized