Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966273Ab3DQMLy (ORCPT ); Wed, 17 Apr 2013 08:11:54 -0400 Received: from nat28.tlf.novell.com ([130.57.49.28]:55577 "EHLO nat28.tlf.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965961Ab3DQMLx convert rfc822-to-8bit (ORCPT ); Wed, 17 Apr 2013 08:11:53 -0400 Message-Id: <516EADD502000078000CE112@nat28.tlf.novell.com> X-Mailer: Novell GroupWise Internet Agent 12.0.2 Date: Wed, 17 Apr 2013 13:12:37 +0100 From: "Jan Beulich" To: "Michael S. Tsirkin" , "Victor Miasnikov" Cc: , , , , , , , "K. Y. Srinivasan" , , , Subject: Re: KVM "Hyper-V emulation" -- this can be related "Linux on Hyper-V" ? Or "KVM emulates Hyper-V" as "Hyper-V emulates Hyper-V" ? Re: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V References: <1359940910-32114-1-git-send-email-kys@microsoft.com> <1359940959-32168-1-git-send-email-kys@microsoft.com> <1359940959-32168-2-git-send-email-kys@microsoft.com> <20130417070616.GA4487@redhat.com> <39D7C3658A5B4979A3F025E1D944E743@local.st.by> <20130417101617.GF3881@redhat.com> In-Reply-To: <20130417101617.GF3881@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 888 Lines: 22 >>> On 17.04.13 at 12:16, "Michael S. Tsirkin" wrote: > If the hypervisor says it's Hyper-V, that's because it wants > guests to use Hyper-V. I don't see why is guest second-guessing > this a good idea. There are two reasons here: For one, when the hypervisor is not Hyper-V, but is providing some Hyper-V emulation, that's intended for Windows guests to use, not e.g. Linux ones, especially when such guests could use the native hypervisor interface with much greater benefit. And second, there reportedly are features of (newer?) Hyper-V that some emulation may not provide, but that are also not easily detectable. Jan -- 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/