Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756022Ab3HARWo (ORCPT ); Thu, 1 Aug 2013 13:22:44 -0400 Received: from mail-oa0-f47.google.com ([209.85.219.47]:34671 "EHLO mail-oa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752163Ab3HARWn (ORCPT ); Thu, 1 Aug 2013 13:22:43 -0400 MIME-Version: 1.0 In-Reply-To: <51E989A0.8050103@zytor.com> References: <51E97779.3020103@zytor.com> <51E989A0.8050103@zytor.com> From: Ramkumar Ramachandra Date: Thu, 1 Aug 2013 22:52:02 +0530 Message-ID: Subject: Re: [QUERY] lguest64 To: "H. Peter Anvin" Cc: LKML , Rusty Russell Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1318 Lines: 33 H. Peter Anvin wrote: > UML, lguest and Xen were done before the x86 architecture supported > hardware virtualization. [...] > but on KVM-enabled hardware KVM seems > like the better option (and is indeed what libguestfs uses.) While we're still on the topic, I'd like a few clarifications. From your reply, I got the impression that KVM the only mechanism for non-pvops virtualization. This seems quite contrary to what I read on lwn about ARM virtualization [1]. In short, ARM provides a "hypervisor mode", and the article says "the virtualization model provided by ARM fits the Xen hypervisor-based virtualization better than KVM's kernel-based model" The Xen people call this "ARM PVH" (as opposed to ARM PV, which does not utilize hardware extensions) [2]. Although I wasn't able to find much information about the hardware aspect, what ARM provides seems to be quite different from VT-x and AMD-V. I'm also confused about what virt/kvm/arm is. Thanks. [1]: http://lwn.net/Articles/513940/ [2]: http://www.xenproject.org/developers/teams/arm-hypervisor.html -- 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/